公开(公告)号：US06468328B2

公开(公告)日：2002-10-22

申请号：US09739150

申请日：2000-12-18

申请人： Shivaji Sircar ,  William Emil Waldron

发明人： Shivaji Sircar ,  William Emil Waldron

IPC分类号： B01D53047

CPC分类号： B01D53/0476 ,  B01D53/0446 ,  B01D53/047 ,  B01D2253/108 ,  B01D2256/12 ,  B01D2257/102 ,  B01D2259/40062 ,  B01D2259/40079 ,  B01D2259/40081 ,  B01D2259/401 ,  B01D2259/4143 ,  B01J20/18 ,  B01J20/186 ,  B01J2220/42 ,  C01B13/0259 ,  C01B13/027 ,  C01B2210/0046 ,  Y10S95/902

摘要： A process for producing an oxygen enriched product includes: (a) providing a gas separation apparatus having at least one bed containing a mixture of at least two different nitrogen selective adsorbents, wherein the at least one bed is free of lithium cations; (b) feeding a feed gas containing oxygen and nitrogen into the gas separation apparatus to contact the at least one bed; and (c) recovering from the gas separation apparatus the oxygen enriched product. The process is preferably performed above ambient temperature and/or in a simplified four-step cycle. The cycle includes: (a) feeding a feed gas containing oxygen into a gas separation apparatus to contact at least one bed of the apparatus with the feed gas, wherein the feed gas is at a temperature above ambient; (b) countercurrently evacuating the at least one bed following the feeding; (c) countercurrently purging the at least one bed with the oxygen enriched product under vacuum; and (d) simultaneously pressurizing the at least one bed with a countercurrent stream of the oxygen enriched product and a cocurrent stream of the feed gas.

公开(公告)号：US5882380A

公开(公告)日：1999-03-16

申请号：US949298

申请日：1997-10-13

申请人： Shivaji Sircar

发明人： Shivaji Sircar

IPC分类号： B01D53/053

CPC分类号： B01D53/053 ,  B01D2253/10 ,  B01D2253/108 ,  B01D2256/10 ,  B01D2256/12 ,  B01D2259/4006 ,  B01D2259/401 ,  B01D53/0446

摘要： A single-bed PSA system comprising a blower, an adsorber vessel, and a gas product storage tank separates a gas mixture using a three-step cycle comprising adsorption, evacuation, and pressurization. Pressurization is accomplished by introducing gas from the gas product storage tank into both the feed end and the product end of the adsorber vessel. Preferably a portion of the pressurization gas is introduced into the adsorber vessel by the blower, which also is used for providing feed to the adsorber and for withdrawing gas from the adsorber during the evacuation step.

摘要翻译： 包括鼓风机，吸附器容器和气体产品储罐的单床PSA系统使用包括吸附，抽空和加压的三步循环分离气体混合物。 通过将来自气体产品储罐的气体引入吸附器容器的进料端和产物端来实现加压。 优选地，一部分加压气体通过鼓风机引入吸附器容器，该鼓风机也用于在抽空步骤期间向吸附器提供进料并从吸附器抽出气体。

公开(公告)号：US5753010A

公开(公告)日：1998-05-19

申请号：US736846

申请日：1996-10-28

申请人： Shivaji Sircar ,  William Emil Waldron ,  Madhu Anand ,  Madhukar Bhaskara Rao

发明人： Shivaji Sircar ,  William Emil Waldron ,  Madhu Anand ,  Madhukar Bhaskara Rao

IPC分类号： B01D53/047 ,  B01D53/22

CPC分类号： B01D53/047 ,  B01D2256/16 ,  B01D2257/50 ,  B01D2257/7022 ,  B01D2259/4006 ,  B01D53/0446

摘要： A method for increasing product recovery or reducing the size of steam methane reformer and pressure swing adsorption systems utilized for hydrogen production. A significant portion of the hydrogen in the PSA depressurization and purge effluent gas, which is otherwise burned as fuel in the reformer, is recovered and recycled to the PSA system to provide additional high purity hydrogen product. This is accomplished by processing selected portions of the depressurization and purge effluent gas in adsorbent membrane separators to increase hydrogen content for recycle to the PSA system. Remaining portions of the depressurization and purge effluent gas which contain lower concentrations of hydrogen are utilized for fuel value in the reformer.

摘要翻译： 一种用于提高产品回收率或减小用于氢气生产的蒸汽甲烷重整器和变压吸附系统的尺寸的方法。 回收再循环到PSA系统中的PSA减压和吹扫废气中的大部分氢，否则这些氢气作为燃料被燃烧，以提供额外的高纯度氢产物。 这是通过在吸附膜分离器中处理选定部分的减压和吹扫流出气体来实现的，以增加用于再循环到PSA系统中的氢含量。 含有较低浓度氢的减压和吹扫废气的剩余部分用于重整器中的燃料价值。

公开(公告)号：US5435836A

公开(公告)日：1995-07-25

申请号：US173457

申请日：1993-12-23

申请人： Madhu Anand ,  Madhukar B. Rao ,  Shivaji Sircar

发明人： Madhu Anand ,  Madhukar B. Rao ,  Shivaji Sircar

IPC分类号： B01D53/22 ,  C01B3/50 ,  C01B3/56 ,  B01D53/047

CPC分类号： B01D53/229 ,  C01B3/501 ,  C01B3/56 ,  C01B2203/0405 ,  C01B2203/043 ,  C01B2203/047 ,  C01B2203/0475 ,  C01B2203/048

摘要： Recovery of hydrogen from hydrogen-containing gas mixtures by pressure swing adsorption is increased by utilizing an adsorbent membrane to concentrate hydrogen in the pressure swing adsorption reject gas and recycling the resulting hydrogen-enriched stream to the feed of the pressure swing adsorption system. Lower compression requirements are realized compared with the use of polymeric membranes for the same service because the hydrogen-enriched stream is recovered from the adsorbent membrane as nonpermeate at essentially the membrane feed pressure. Simultaneous permeation of carbon dioxide and methane occur in the adsorbent membrane, which can be operated at feed pressures as low as 5 psig when hydrogen is used as a sweep gas.

摘要翻译： 通过利用吸附剂膜将氢气在变压吸附废气中浓缩并将所得富氢物流再循环到变压吸附系统的进料中，通过变压吸附从含氢气体混合物中回收氢。 与使用相同服务的聚合物膜相比，实现了较低的压缩要求，因为在基本上膜进料压力下，富集的流从吸附膜回收为非渗透性。 在吸附剂膜中同时渗透二氧化碳和甲烷，当氢气用作吹扫气体时，其可以在低至5psig的进料压力下操作。

公开(公告)号：US5332424A

公开(公告)日：1994-07-26

申请号：US98654

申请日：1993-07-28

申请人： Madhukar B. Rao ,  Shivaji Sircar ,  Joseph M. Abrardo ,  William F. Baade

发明人： Madhukar B. Rao ,  Shivaji Sircar ,  Joseph M. Abrardo ,  William F. Baade

IPC分类号： B01D53/22 ,  F25J3/02 ,  B01D53/04

CPC分类号： B01D53/229 ,  B01D53/226

摘要： A method is disclosed for separating a multicomponent gas mixture comprising at least three components into three product streams by use of adsorbent membrane zones operating in series. Each product is enriched in a different component based upon the relative strength of adsorption of each component on the adsorbent material. A non-permeate primary component product is obtained by the selective adsorption and permeation through the adsorbent membranes of secondary components which are more strongly adsorbed than the primary components in the gas mixture. Two or more permeate streams enriched in the more strongly adsorbed components are withdrawn from the membrane zones as individual secondary products, each of which contains a different component distribution determined by the relative strength of adsorption of the secondary components on the adsorbent material. Increased recovery and product purity are realized by the integration of pressure swing adsorption (PSA) and cryogenic separation systems with the adsorbent membrane zones. PSA reject gas is used as a membrane sweep gas to increase the permeation rates of secondary components.

摘要翻译： 公开了一种通过使用串联操作的吸附膜区域将包含至少三个组分的多组分气体混合物分离成三个产物流的方法。 基于吸附材料上每种组分的吸附的相对强度，每种产品富含不同的组分。 通过选择性吸附和渗透通过比气体混合物中主要组分更强吸附的次要组分的吸附剂膜获得非渗透性主要组分产物。 富集更强吸附组分的两个或多个渗透物流作为单独的次级产物从膜区域中排出，每个次级产物含有由吸附剂材料上的次要组分的吸附的相对强度确定的不同组分分布。 通过将变压吸附（PSA）和低温分离系统与吸附剂膜区域整合来实现提高回收率和产物纯度。 PSA废气用作膜吹扫气体以增加次要组分的渗透速率。

公开(公告)号：US5240472A

公开(公告)日：1993-08-31

申请号：US890403

申请日：1992-05-29

申请人： Shivaji Sircar

发明人： Shivaji Sircar

IPC分类号： B01D53/22 ,  B01D53/26 ,  B01D71/02 ,  C01B13/02 ,  C01B21/04

CPC分类号： B01D67/0048 ,  B01D53/229 ,  B01D53/268 ,  B01D69/02 ,  B01D71/02 ,  B01D2323/08 ,  Y02C10/10

摘要： This invention pertains to an improved process for the removal of moisture from a moisture laden gas stream such as air utilizing a membrane dryer unit. The membrane dryer unit is equipped such that it incorporates a selective surface flow adsorbent membrane consisting essentially of an inorganic membrane material selected from the group consisting of alumina and silica gel membranes wherein the membrane has a thickness of approximately 0.5 to 50 microns with a mean pore size of less than about 15 A and preferably within about 4 to 10 A. In the cryogenic separation of air, an air stream contaminated with moisture and carbon dioxide is passed through the membrane dryer unit in countercurrent flow to a dry purge gas, wherein the water is selectively removed from the air stream. The partially dried air stream then is conveyed to an adsorption system operated under thermal swing or pressure swing conditions wherein the residual water and carbon dioxide are removed.

公开(公告)号：US5116510A

公开(公告)日：1992-05-26

申请号：US696476

申请日：1991-05-06

申请人： Shivaji Sircar ,  Madhukar B. Rao

发明人： Shivaji Sircar ,  Madhukar B. Rao

IPC分类号： B01D15/00

CPC分类号： B01D15/00

摘要： A new thermal swing adsorption process for the separation of a bulk liquid mixture into its respective components wherein a novel rinse step is employed to achieve high product recovery with a low energy of separation. The invention is particularly useful for separating liquid mixtures containing azeotropes or close-boiling components which are difficult to separate using conventional techniques such as distillation or routine termal swing adsorption. A given example is the separation and recovery of methyl acetate from a bulk liquid mixture containing methyl acetate and water.

公开(公告)号：US5084075A

公开(公告)日：1992-01-28

申请号：US507700

申请日：1990-04-10

申请人： Shivaji Sircar

发明人： Shivaji Sircar

IPC分类号： B01D53/04 ,  B01D53/047 ,  C01B21/04

CPC分类号： B01D53/0476 ,  C01B21/045 ,  B01D2253/102 ,  B01D2253/104 ,  B01D2253/106 ,  B01D2253/108 ,  B01D2256/10 ,  B01D2256/12 ,  B01D2257/102 ,  B01D2257/504 ,  B01D2257/80 ,  B01D2259/40022 ,  B01D2259/4003 ,  B01D2259/40062 ,  B01D2259/40064 ,  B01D2259/403 ,  B01D2259/4146 ,  B01D53/261 ,  Y02C10/08 ,  Y02P20/152

摘要： A method is described for recovering nitrogen from air in a three bed vacuum swing adsorption technique in which the beds are not rinsed with nitrogen gas before recovering a nitrogen recycle stream and a nitrogen product.

公开(公告)号：US4529416A

公开(公告)日：1985-07-16

申请号：US465845

申请日：1983-02-11

申请人： Shivaji Sircar ,  William J. Ambs ,  Roger R. Conrad

发明人： Shivaji Sircar ,  William J. Ambs ,  Roger R. Conrad

IPC分类号： B01D53/02 ,  B01D53/04 ,  B01J20/16 ,  B01J20/18 ,  C01B39/22 ,  C01B39/26

CPC分类号： B01D53/02 ,  B01D53/0462 ,  B01D53/047 ,  B01J20/16 ,  B01J20/186 ,  B01D2253/108 ,  B01D53/0423 ,  Y10S95/902

摘要： To improve the column dynamics of commercial pelleted sodium aluminosilicate zeolite adsorbents used in gas separation, the pellets are treated by washing in dilute aqueous mineral acid. The treatment is most effective as applied to sodium mordenite pellets, employing hydrochloric acid of about 0.1 normality.

摘要翻译： 为了改善用于气体分离的商业颗粒状硅铝酸钠沸石吸附剂的柱动力学，通过在稀无机酸水溶液中洗涤来处理颗粒。 该处理最适用于钠丝光沸石丸，使用约0.1正常的盐酸。

公开(公告)号：US4472177A

公开(公告)日：1984-09-18

申请号：US416433

申请日：1982-09-09

申请人： Shivaji Sircar

发明人： Shivaji Sircar

IPC分类号： B01D53/04 ,  B01D53/047 ,  C01B13/02

CPC分类号： B01D53/0476 ,  B01D2253/108 ,  B01D2256/12 ,  B01D2257/102 ,  B01D2259/40003 ,  B01D2259/40007 ,  B01D2259/40009 ,  B01D2259/40052 ,  B01D2259/40062 ,  B01D2259/404 ,  B01D53/0454

摘要： A system and method of controlling a vacuum swing adsorption process. During an adsorption step, the percent composition of the gas being processed is sensed as it is introduced into at least one train of beds which comprises a pretreatment bed and an air fractionation bed. The control system terminates the adsorption step when a predetermined high level oxygen composition is detected. During a rinse step the percent composition of the high purity nitrogen in the train is sensed. The control system terminates the rinse step when a predetermined low level oxygen composition is detected. During an evacuation step, the level of pressure in the train is sensed and predetermined subatmospheric pressure levels are detected for terminating evacuation in first, the air fractionation bed, and second, the pretreatment bed. During a pressurization step, the pressure level in the pretreatment bed is sensed and the control system terminates the pressurization in the train when a predetermined pressure level is detected in the pretreatment bed.

摘要翻译： 一种控制真空摆动吸附过程的系统和方法。 在吸附步骤期间，被处理气体的百分比组成被检测为被引入到包括预处理床和空气分馏床的至少一列床层中。 当检测到预定的高水平氧组成时，控制系统终止吸附步骤。 在漂洗步骤期间，感测到列车中高纯氮的百分比组成。 当检测到预定的低水平氧组成时，控制系统终止冲洗步骤。 在抽空步骤期间，检测列车中的压力水平，并且检测预定的低于大气压的压力水平，以在第一空气分馏床中终止排气，其次，预处理床。 在加压步骤期间，在预处理床中检测到预定压力水平时，感测预处理床中的压力水平，并且控制系统终止列车中的加压。