Swinging sives-Proper regeneration of molecular sieves in TSA processes—Part 1

The PSA process uses molecular sieve a synthetic zeolite , which attracts adsorbs nitrogen from air at high pressure and releases desorbs it at low pressure. AirSep Oxygen Generators use two vessels filled with molecular sieve as adsorbers. As compressed feed air flows through one of the vessels, the molecular sieve adsorbs nitrogen. The Pressure Swing Adsorption process for the generation of enriched oxygen gas from ambient air utilises the ability of a synthetic Zeolite Molecular Sieve to absorb mainly nitrogen. While nitrogen concentrates in the pore system of the Zeolite, Oxygen Gas is allowed to pass through as a product.

Swinging sives

Swinging sives

Retrieved 10 July It Swinging sives can be used as a soap forming agent and in toothpaste. This means that, initially, the adsorption time and, therefore, the adsorption capacity of the molecular sieve is higher when the molecular sieve is fresh. The energy needed to obtain suitable regeneration is achieved through the sum of four components:. Swinging sives the second case, the pressure change rate was decreased, and a sub-zero temperature was avoided. Editorial Comment -Adrienne Blume The continued expansion of natural gas trade is led primarily by growth in the LNG sector, which has tripled over the past 3 yr. Sweetening removal of thiols of aviation fuel and corresponding liquid hydrocarbons. A majority of natural gas, petrochemical and refinery units are TSA based. The latter include cracking gas, acetyleneethyleneEffective penile enlargemdnt surgery and butadiene. Like temperature and time, pressure is another important parameter for the design of the regeneration phase.

Model sub hull. Sifter Models, Sieves, Screens & Accessories

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The regeneration of molecular sieves is the most crucial step in temperature swing adsorption TSA processes. It determines the performance and operating cost of molecular sieves over a given lifetime. It is well known that molecular sieves age with each regeneration cycle. The adsorption process on the molecular sieve is a complex phenomenon and often poses challenges for the design and operation of the units, due to a number of parameters that govern the efficiency of such processes.

Poor design decisions and deviations from design conditions can cause a wide range of operating issues in a molecular sieve unit. Most of the damage from these upsets or deviations from design conditions usually occurs during the regeneration step. If not addressed properly, these upsets can result in reduced lifetimes, increased pressure drops across beds, loss of product quality, formation of hydrates, increased system corrosion or increased plant downtime—all of which have cost implications.

It is, therefore, important to properly design and operate the regeneration phase of molecular sieves. The main design principles and recommendations for the regeneration step in TSA processes are presented here, along with ways to address key issues concerning troubleshooting, optimizing and adapting plant operations under different constraints.

Part 1 focuses on the general design philosophy and key operating parameters, and Part 2 will concentrate on the regeneration gas and contaminants. Industrial adsorption on zeolite molecular sieves. The principles of industrial adsorption on the zeolite molecular sieve have been well documented in the academic and industrial worlds.

They are made of a three-dimensional succession of SiO 4 and AlO 4 tetrahedra sodalite cages in the presence of metal ions to balance the negative charges created by the trivalency of aluminum. This results in a final network of repeated crystals with channels and uniform size cavities known as porosity that exhibit a large and electronically active surface area.

In the separation application, for an impurity to be efficiently adsorbed, the molecule of the impurity should be polar and of an appropriate size that corresponds to the pores present in a given type of zeolite.

The diameters of the pores and cavities depend on the type of zeolite and on the nature and size of the charge-compensating cations, which are situated around the pores. The zeolite crystals are compounded with a binding clay to form beads or extrudates.

Zeolites, also known as molecular sieves, are used industrially in the fixed beds to purify a gas or a liquid stream. Depending on the application and molecules to be captured, an appropriate type of zeolite is chosen. The adsorption capacity of a molecular sieve is governed by isotherms function of temperature and pressure , and once the molecular sieve is saturated with impurity molecules, the equilibrium conditions need to be changed either temperature or pressure or both to desorb the impurity and reuse the molecular sieve for adsorption.

Adsorption with molecular sieves is usually performed in systems having at least two vertical absorbers, one in adsorption and one in regeneration. For high flowrates, several adsorbers can be used in parallel, as shown in Fig. The regeneration stage features cooling and heating in series, for the case where the regeneration gas flowrate must be reduced.

During adsorption, a molecular sieve bed is modeled by a three-zone system, as illustrated in Fig. Close to the inlet is the equilibrium zone EZ , where the adsorbent is in equilibrium with the process fluid—i. The MTZ shows a gradient of the impurity concentration, which decreases to a required outlet specification and can be defined as the length required for the adsorbent to bring the impurities from their initial concentration to the final specification.

The third area is made of fresh adsorbent that, for a given adsorption time, has not been in contact with the impurities. Sieve design. A number of parameters influence the design and operation of a molecular sieve unit. The operating temperature and partial pressure of an impurity, along with the type of molecular sieve 3A, 4A, 5A, 13X defines the adsorption capacity of that impurity. Flowrate and pressure drop constraints, coupled with the adsorption capacity, are important to select the appropriate flow regime, mass transfer kinetics and, by extension, the design of vessels.

An adapted pore size of molecular sieve, along with an appropriate bed configuration based on adsorbent size and composed of big particles, small particles or a split bed , also influence the size of vessels. The choice of an appropriate diameter-to-height ratio will influence the pressure drop and flow distribution, as well as the regeneration duty requirement.

Regeneration of molecular sieves is normally performed in either the pressure swing adsorption PSA processes or in the TSA processes. In the first case, the change in the adsorption equilibrium is obtained by decreasing the pressure. PSA processes, which are usually used in non-aggressive applications with less stringent outlet specifications i.

TSA processes, usually used in applications with stringent outlet specifications 0. A majority of natural gas, petrochemical and refinery units are TSA based. The design for these units is provided by molecular sieve suppliers specializing in the know-how of these applications. The PSA process is usually designed by technology licensors, and the molecular sieve supplier role provides appropriate product and as-needed operational assistance, so that a unit is less susceptible to deviations or problems.

TSA-based regeneration processes are discussed here. Regeneration phase design. It is well known that molecular sieves age over time and with each regeneration cycle. The speed and the way the sieves age determine the lifetime of a unit. Therefore, it is important to properly design and operate the regeneration phase. An incorrect pressure change rate can lead to sub-zero temperatures, resulting in ice formation that will damage molecular sieve structure.

Channeling or lifting of the bed can occur if an appropriate pressure drop per length is not respected. The heating step during regeneration is critical for several reasons: The gas must be clean enough to avoid side effects which are usually exacerbated at high temperature , and it must carefully address the required regeneration energy duty i.

Correct temperature ramps should be provided to avoid damage of the molecular sieves by thermal stress. An intermediate heating step is often recommended in the drying applications to avoid the phenomenon of hydrothermal damaging of the molecular sieve. An appropriate temperature profile that is adapted to the specific type of molecular sieve should be provided, along with sufficient heating time, to attain a stable outlet temperature plateau to mark the completion of regeneration.

The type of regeneration gas e. After heating, a cooling phase is needed before switching back to adsorption; this helps avoid a temperature peak that might disturb the downstream process. A wide range of operating issues in the molecular sieve units can be caused by poor design decisions, as well as deviations from the design conditions like change of process conditions, presence of contaminants, 2,9 emergency shutdowns, etc. A major part of the damage from these upsets usually happens during the regeneration step at high temperatures.

If not addressed properly, these upsets can result in reduced lifetime, increased pressure drop across beds, loss of product quality, hydrate formation, increased system corrosion or increased plant downtime—all of which have cost implications.

Over the course of this two-part article, recommendations for the design of the regeneration step in TSA processes will be presented, along with how these recommendations can be adapted for several key issues that industrial operators may face while operating a molecular sieves unit, and which EPC companies may face when designing a new unit.

Regeneration of molecular sieve. The equilibrium adsorption capacity of an impurity on a given molecular sieve is determined by using isotherms. As an example, Fig. At the end of the adsorption phase, the molecular sieve is saturated and no more impurity can be adsorbed. However, the adsorption is reversible. The adsorbed impurity can be desorbed and eliminated from the molecular sieve by shifting the adsorption equilibrium and modifying the operating conditions—or, more commonly, by increasing the temperature, by decreasing the pressure, or by doing both.

At the end of regeneration, the molecular sieve can recover most of its original adsorption capacity—i. Thermal regeneration is a widely used method in the oil and gas industry. To regenerate the molecular sieve, several steps are generally involved:. The regeneration stage often starts with a depressurization step.

The depressurization is required if the regeneration is performed at a pressure lower than that of the adsorption phase. This may arise for different reasons, as the regeneration gas is not the product gas, but rather another gas available at a lower pressure, such as N 2 , H 2 , CH 4 and fuel gas. The lower pressure can also be chosen to optimize the regeneration energy requirement.

In liquid applications, the depressurization step can be followed by a draining step. During the draining step, all liquid must be evacuated from the adsorber before the introduction of a heating gas.

The liquid is generally drained by gravity flow. At the end of the draining step, almost all of the liquid is drained, except for a very small portion that is trapped in the molecular sieve and on the surface of the adsorber vessel.

This liquid is removed during the purging step, where cold regeneration gas is introduced for 1 hr—2 hr to strip off this remaining liquid. Following this step, the heating step is started by introducing hot regeneration gas into the vessel.

The temperature is slowly increased to the heating temperature to avoid thermal stress. The energy needed to obtain suitable regeneration is achieved through the sum of four components:. A hot gas with a certain flowrate, a specific temperature and a given flow time supplies the heating energy necessary for the regeneration. As can be seen from the isotherms, the temperature rise causes a decrease of the impurity loading on the molecular sieve.

Passing a hot gas stream has two effects: first, desorption of the impurity due to the temperature rise, and second, transport of the desorbed impurity out of the bed. This means that a certain quantity of heat at a minimum temperature should be brought into the adsorber to desorb the impurity.

Furthermore, if the regeneration gas flowrate or duration is too small, then an accumulation will occur on the top layers of the molecular sieves due to a lack of desorption energy. In the case of laminar flow or channeling, the gas does not pass through the entire bed due to the preferential path of the flow, but rather through only part of the bed. This may lead to localized accumulation in the bed.

At the end of the heating step, the molecular sieve is regenerated. However, the impurities are not completely desorbed. A certain residual content of impurity always remains in the molecular sieve, corresponding to the equilibrium conditions at the end of heating and the thermal profile observed by the molecular sieve.

The value of this residual impurity content depends on the quality of regeneration i. The result is a reduced adsorption time for the next adsorption cycle. Molecular sieve suppliers often design the unit based on the end of lifetime adsorption time. This means that, initially, the adsorption time and, therefore, the adsorption capacity of the molecular sieve is higher when the molecular sieve is fresh.

Throughout its lifetime, this adsorption time decreases due to aging. These factors mean that the molecular sieve unit can be operated in two ways:. After heating, a cooling phase is needed before switching back to the adsorption; this helps avoid a temperature peak that would usually cause significant disturbance to the downstream process.

The energy needed to obtain suitable cooling is the sum of three components:. A cool gas with a certain flowrate, a specific temperature and a given flow time supplies the energy necessary for cooling. At the end of the cooling step, the vessel is repressurized to the adsorption pressure, and also refilled with liquid in case of liquid applications, and then put on standby before switching to the adsorption phase of the next cycle. The standard recommendations for several of these parameters, and how they can be adapted in the case of process deviations, will be presented in Part 2.

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Swinging sives

Swinging sives

Swinging sives

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We had never met Joe, but Pat had a lot of good to say about him so he had to be okay. At p. It all started when Joe knelt down and kissed Sue and said Merry Christmas. He placed his hand inside her top and squeezed her right tit, making Sue moan. I told the others to join their brother and enjoy themselves.

They didn't have to be told twice. They were really curious but very apprehensive about actually going through with it.

Hope everyone is enjoying the stories of my wife's and my experiences. Sue is helping me write these, we are both enjoying sharing our personal experiences with everyone. Being anonymous allows us to really open up and reveal what is going on across this country in many more bedrooms than you think. Your neighbor could be having an orgy right now. Just think what you could be missing!

I told John I'd like to try telling you all about one of our adventures. John is going to write the story while I try my hand at telling the story from my point of view. Sometimes a woman's point of view is different from a man's. John is laughing and Sue can't figure out why. Sue is a blonde. In our last episode, Sue and I had a really exciting time with our babysitter, Alexia.

Car trouble had ruined other plans and we came home to find Alex masturbating to one of our "home movies. It was a very exciting night and my wife, Sue, and I were hoping to be able to get together with Alex again sometime.

Neither of us was expecting our chance to come as soon as it did. We were sitting around watching TV one night and I asked her what she would like to do for her 39th birthday. She said she would like very much to turn 30! I asked her if there was maybe something else that I could realistically help her with. Sue really surprised me with her answer.

She told me that she had a fantasy about going out to a bar and picking up some guy, or maybe two guys, and letting them fuck her. She said that she wanted to dress up like a very sexy slut, tease some men and pick out one or two to get laid by. We had some very interesting conversations, enjoying the company of this year-old girl. Alex told us that she and her mother had been enjoying themselves together about twice a week since we all had been together.

She told us that she and her mother were even closer than they were before having sex together. Alex said her brother was visiting for a couple of weeks and that Moni, her mother, and she had had to be very careful not to get found out by him. Alex didn't think he would understand their relationship. Sue and I hated to be separated for so long, but I was working on a new account that meant a lot of money to the business.

Sue and I talked every couple of days on the telephone. We had not been separated like this since we had met. It seemed that at least every other call ended up with a very graphic and sexual conversation. We were both horny as hell and it didn't take much to get both of us going. MF, phone-sex, swing Swingers by Anon - Time again for another story in the series. In the last story, 9th Swing, my wife, Sue, told me on the phone about her escapades with our friend Alexia and her friends.

I'd been away out West on business for quite a while and Sue and I agreed to see what it would be like to enjoy sex with others whenever I had to be gone for extended periods. So far, Sue was the only one who has had the opportunity to get laid without me there. It was Saturday, though, and I planned on hitting the town that night to try my luck with the local girls.

We meet on weekends for evenings of sucking and fucking so to speak. MF, exh, swing Swinger's Haven - by Anon - A man convinces a couple he's just met into have a threesome. MMF, threesome, swingers Swinging Holiday - by Art West - A young married couple who have not managed to have a baby go on a last holiday with two other couples before undergoing egg harvesting and in-vitro fertilization. They expect that some swinging will occur, but are not worried as the other two men they are playing with have had vasectomies.

But there's been some misunderstanding. Well, she's gotten hooked on reading these stories and told me that I should continue to send them and write about what we're really doing. A thick cocked man and his hot wife. MF-cpls, voy, orgy, oral, swing Switch, The - by Anon - A story about a guy and his girlfriend who try out a threesome with two females and him. And then just for kicks his girlfriend makes a switch on him without his knowledge when he expresses his curiosity to her about how it feels to be fucked.

MMF, wife, forced, husb-voy, intr, swingers Thanksgiving - by Tom - They say that a man has a sexual thought every 15 or 20 seconds, and I was certainly having one about Sue. MF-cpls, cons, swing Three Isn't Always A Crowd - by Sandy Maddox - Karen had discussed having a threesome with her boyfriend, Jimmy, and another woman on a number of occasions and finally they decided to do it since Jimmy wanted it and Karen had fantasized about it. But when things happen, she turns out to be a good sport.

To his surprise, she approaches him with an offer to romp with her. The only catch is, he has to do her husband, too. MMF, MM-bi, swing Tom and Lotti Do the Club - by JonboyS7 - A husband and wife like to walk a bit on the wild side and maybe it was that streak that induced them to joining "The Club" an exclusive Swinger's Club that allowed a no-holds-barred approach to swinger orgies.

T - A wife wants to start a family but her husband is never home due to military duty to impregnate her -- so she looks elswhere.

MF, rom, exh, orgy, ws, v, mc, bi, swing Truth Or Dare: Bar Style - by James - Husband and wife find a friend to play a little game with, while a the bar. She considered his fantasies only to tell him she would perform any fantasy of his, if he performed the same fantasy first. MMF, voy, orgy, swing Two Becomes Three Becomes Four - by Jizzbo44 - A widower is surprised when a married couple that he has known for years asks him if he would like to share their bed.

It takes a while for the husbands to catch on. MF-cpls, exh, swingers, preg Under Her Thumb - by Kewtieboy - A well built, red haired geeky guy pulls the horniest and sluttist girl at school and ends up marrying her.

She starts as the perfect wife but soon her old desires return and get kinkier and kinkier as she insists he is included in her fun. MF-cpls, swing Vacation Adventure - by Anon - A couple have a fun-filled swinger vacation, making new friends along the way.

MF-cpls, swingers Vacation Trip With Best Friend's Family - by Johndough - With her mother working evenings and weekends and her father posted overseas, Hazel spends a lot of time with her best friend and her family. When they announce they're going on a two week vacation Hazel permission from her mom to go with them.

Little does she know that Paradise Valley Family Camp is not only a nudist camp. This boat an crew prove the point over and over. We're in our mid's and were looking for a good time leaving the kids behind for a long weekend. MMMF, wife-swap, oral, gb, anal, exh, rom, swingers Vicki Sells Her Body For Charity - by Lingus - A story about a rather strange neighborhood association where the folks get together and auction off their husbands and wives as sex slaves to the highest bidder, and all for charitable causes.

The story revolves around Vicki and Bill Holman who are a new couple to the neighborhood. She is auctioned off for the first time, and there is considerable interest in the "new" woman in the group. Needless to say Vicki brings a pretty good price.

MF, wife, exh, gb, orgy, swing Visit, The - by Cumslut - A visit to a hooker, where I describe my bisexual experiences. Only it turns out that the films are being shot live from the next room.

Then they are invited to play. MF, voy, exh, swing Voltaire, The - by BlueHat - A swinging billionaire named Louis van Haugh has seen it all, but when he discovers The Voltaire, an exclusive brothel shrouded in mystery, he gets more than he ever would have expected. Mf, oral, preg, prost Warehouse 8 - by Anon - A couple attends a rather unusual party. MMF, exh, reluc, mast, swing, military Watching Cheryl - by KarenKay - Cheryl shared her secret fantasy about having sex with another man.

The couple soon agree to explore their fantasy together and arrange for a meeting with a black man Cheryl picked on an online dating site. Even given the low estimates of half a percent -- that equals 1.

Many swingers, especially females, are active in the LifeStyle due to bisexual curiosity. The man at the grocery store who looked your wife up and down may not just be thinking about her being naked - he may be thinking about her being naked with his wife. While most swinging is about two couples sharing fun and swapping partners, many swingers regularly participate in threesomes.

Virtually all men fantasize about having two girls, and many women admit to fantasizing about sex with two men. Adult Swingers, as each generation enters sexual maturity, with less sexually repressed attitudes, they are increasingly willing to experiment. Just as it has become more socially acceptable to be gay or lesbian, sexual attitudes toward bisexuals and partner swapping are also changing.

The taboo that society places on everything it categorizes as "out of the norm" has kept both homosexuals and swingers in the closet. But today it almost seems cool to be Gay. Perhaps in a few years, it will be the "in thing" to be a swinger. Given the thousands of swinger clubs, resorts, conventions, websites, private parties and related events, it's easy to agree that swingers are everywhere. As information becomes more freely available via the Internet, more and more couples talk about it and decide to give it a try.

In the past it was quite difficult and time consuming to meet like-minded people using the magazines gleaned from the adult bookstores and that made it easy to give up. With the Internet, you're only a few clicks away from finding thousands of swingers who are just what you're looking for. Even if you enter a distance range, age range and other basic criteria, there are still too many results to consider. Narrow that search down and you've found several perfect matches that are only a few miles away.

Looking for a couple with a bisexual female, between 35 and 40, within 20 miles? It's easy to find hundreds of them on the Internet. Additionally, LifeStyle clubs are evolving, becoming more elegant and attracting a broader range of people. Frequently, people in the LifeStyle attend a party or club and run into someone they know from work or some other social activity.

Most swingers have a story about just such an occurrence. It usually goes something like this: "My wife and I go to swinger's parties often and one party we went to was great -- until our neighbor and his wife walked in. I was shocked and concerned that the whole neighborhood would find out. After I got over the initial shock, I realized that my neighbor was thinking the same thing. Of course neither of us told anyone, and we're now great friends as well as neighbors.

All seem to be very aware of the unwritten rules of privacy. For that reason, you can feel pretty secure that you won't be ratted out; we're all in the LifeStyle together. I've personally run into swingers at work, at dinner, at a strip club, at a non-swinger party, at nude beaches and in many other places.

It almost seems like swingers develop the same sort of "radar" that gays are supposed to have. You start to pick up on things that others don't notice: the couple at the local night club dancing a little too close, or a bit too risque.

Or maybe it's the couple at the coffee house where the female is wearing something WAY too sexy for a coffee house -- especially on a Tuesday. What about the two couples you've seen, and then you can't figure out which of the males and females are together? Adult Swingers, have you seen a neighbor walking from the front door to the car, wearing a long overcoat, in August?

Maybe she's wearing something a bit too sexy under that coat. I've begun to notice some couples' reaction when a sexy lady walks by at the local pizza place. It's very interesting to see when they both turn to watch as she walks away. That's a pretty big clue. Yes, swingers are everywhere, and if you look, you'll see them. A few careful questions later, you'll be able to confirm that they are, in fact, swingers. As Adult Swingers, we live in South Florida and are blessed with a variety of clubs to choose from.

We have six clubs within a thirty-minute drive and each club is packed full of people every Saturday night. Each weekend there are also several private parties, hotel parties and other events from which to choose. With all the things for swingers to do, it's obvious there are plenty of people in the LifeStyle. Adult Swingers are those interested in the LifeStyle who develop enough courage to investigate beyond the curiosity stage are often surprised when they discover how easy it is to find swingers so close to them.

Those new to the LifeStyle often find that their preconceptions about the LifeStyle were way off. Swingers are not the middle-aged, overweight 's rejects as the stereotype suggests.

They are normal people, the same people you see everywhere. They go to the grocery store, to the baseball game and to the movies. Swingers are not sexually deviant and perverse.

Great Western Sifters

The PSA process uses molecular sieve a synthetic zeolite , which attracts adsorbs nitrogen from air at high pressure and releases desorbs it at low pressure. AirSep Oxygen Generators use two vessels filled with molecular sieve as adsorbers. As compressed feed air flows through one of the vessels, the molecular sieve adsorbs nitrogen. The Pressure Swing Adsorption process for the generation of enriched oxygen gas from ambient air utilises the ability of a synthetic Zeolite Molecular Sieve to absorb mainly nitrogen.

While nitrogen concentrates in the pore system of the Zeolite, Oxygen Gas is allowed to pass through as a product. As Compressed Air passes up through one of the Adsorbers, the molecular sieve selectively adsorbs the Nitrogen. This then allows the remaining Oxygen to pass on up through the adsorber and exit as a product gas. When the adsorber becomes saturated with Nitrogen the inlet airflow is switched to the second off line adsorber. The first adsorber is regenerated by desorbing nitrogen through De-Pressurisation and purging it with some of the product oxygen.

The cycle is then repeated and the pressure is continually swinging between a higher level at adsorption Production , and a lower level at desorption Regeneration.

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In operation since at a pulp and paper mill, it supplies oxygen for use in oxygen delignification and bleaching.

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