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1. 发明授权

US5592832A Process and apparatus for the production of moderate purity oxygen 失效
标题翻译：用于生产中等纯度氧的工艺和设备
公开(公告)号：US5592832A
公开(公告)日：1997-01-14
申请号：US538541
申请日：1995-10-03
申请人： Donn M. Herron , Rakesh Agrawal , Jianguo Xu
发明人： Donn M. Herron , Rakesh Agrawal , Jianguo Xu
IPC分类号： F25J3/04 , F25J3/00 , F25J3/02
CPC分类号： F25J3/04872 , F25J3/0409 , F25J3/04206 , F25J3/04303 , F25J3/0463 , F25J5/007 , F25J2200/04 , F25J2205/02 , F25J2205/04 , F25J2215/50 , F25J2250/40 , F25J2250/50 , F25J2290/32 , Y10S62/903
摘要： The present invention relates to a cryogenic process and apparatus for production of an oxygen product from air, characterized in that a multiple passage plate-fin heat exchanger having at least two sets of passages is used to effectuate the rectifying and stripping functions, wherein one set of passages comprises a continuous-contact rectification dephlegmator which rectifies the separator vapor and produces the enriched-nitrogen rectifier overhead and the crude liquid oxygen bottoms; wherein a second set of passages comprises a continuous-contact stripping dephlegmator which strips the oxygen-enriched liquid to produce the nitrogen-enriched stripper overhead and the oxygen product; wherein reflux of the rectification device and boilup for the stripping device is provided, at least in part, by indirect heat exchange between and along said two sets of passages, thereby producing a thermal link between the rectification dephlegmator and the stripping dephlegmator.
摘要翻译：本发明涉及一种用于从空气中生产氧气产物的低温方法和装置，其特征在于，具有至少两组通道的多通道板翅式热交换器用于实现整流和汽提功能，其中一组的通道包括连续接触式精馏分凝器，其对分离器蒸气进行整流并产生富氮整流塔顶和粗液氧底部; 其中第二组通道包括连续接触的汽提分馏器，其剥离富氧液体以产生富氮汽提塔顶部和氧产物; 其特征在于，至少部分地通过所述两组通道之间和之间的间接热交换来提供精馏装置的回流和汽提装置的沸腾，从而在精馏分馏器和汽提分馏器之间产生热连接。

2. 发明授权

US5678426A Separation of fluid mixtures in multiple distillation columns 失效
标题翻译：在多个蒸馏塔中分离流体混合物
公开(公告)号：US5678426A
公开(公告)日：1997-10-21
申请号：US646651
申请日：1996-05-02
申请人： Rakesh Agrawal , Jianguo Xu
发明人： Rakesh Agrawal , Jianguo Xu
IPC分类号： F25J3/02 , B01D3/14 , B01D3/26 , F01K23/06 , F02C6/10 , F25J3/04 , F25J1/00
CPC分类号： B01D3/146 , F01K23/068 , F02C6/10 , F25J3/0209 , F25J3/0233 , F25J3/0257 , F25J3/04303 , F25J3/04448 , F25J3/04575 , F25J3/046 , F25J3/04606 , F25J3/04872 , F25J2200/04 , F25J2200/20 , F25J2200/50 , F25J2200/54 , F25J2235/02 , F25J2290/10 , F25J2290/40 , Y02E20/18 , Y10S62/915
摘要： A fluid mixture is separated by distillation in a two column system in which a portion of the feed is prefractionated in a first column having at least one separation stage above the feed and the prefractionator bottoms provides feed to a second column operating at a lower pressure. Cooling for condensing the overhead vapor of the first column is provided by heat exchange with flashed prefractionator bottoms or with an intermediate fluid in the second column. Another portion of the feed is flashed and introduced into the second column. The two-column system is readily combined with a high pressure column in a three-column distillation system for separating air which is particularly useful for integration with a gasification combined cycle combustion turbine system. Optionally, three nitrogen products can be produced at three different pressures.
摘要翻译：流体混合物通过蒸馏在两塔系统中分离，其中一部分进料在具有在进料上方的至少一个分离阶段的第一塔中预分馏，并且初步分馏塔底部提供进料到在较低压力下操作的第二塔。通过与闪蒸的初步分馏塔底部的热交换或与第二塔中的中间流体进行热交换来提供用于冷凝第一塔的塔顶蒸气的冷却。进料的另一部分闪蒸并引入第二列。双塔系统容易地与用于分离空气的三塔蒸馏系统中的高压塔组合，这对于与气化联合循环燃烧涡轮机系统的整合特别有用。任选地，三种氮气产物可以在三种不同的压力下生产。

3. 发明授权

US5251450A Efficient single column air separation cycle and its integration with gas turbines 失效
标题翻译：高效的单柱空气分离循环及其与燃气轮机的集成
公开(公告)号：US5251450A
公开(公告)日：1993-10-12
申请号：US938737
申请日：1992-08-28
申请人： Rakesh Agrawal , Jianguo Xu
发明人： Rakesh Agrawal , Jianguo Xu
IPC分类号： F25J3/04 , F25J3/02
CPC分类号： F25J3/04236 , F25J3/042 , F25J3/04296 , F25J3/04309 , F25J3/04351 , F25J3/04363 , F25J3/04393 , F25J3/044 , F25J3/04545 , F25J3/04557 , F25J3/04575 , F25J3/046 , F25J3/04618 , F25J2200/50 , F25J2200/72 , F25J2205/02 , F25J2235/02 , Y10S62/915 , Y10S62/939
摘要： The present invention is an improvement to a process for the cryogenic distillation of air to produce both nitrogen and oxygen products carried out in a single distillation column system wherein a feed air stream is distilled thereby producing a nitrogen overhead and a liquid oxygen bottoms. The improvement is characterized in that: (a) operating the single distillation column at a pressure between 70 and 300 psia [480 and 2,070 kPa.sub.(absolute) ]; (b) withdrawing a portion of the liquid oxygen bottoms having an oxygen concentration greater than 80% oxygen and preferably between 85% and 97% oxygen from the bottom of the single distillation column and reducing the pressure of and vaporizing the withdrawn liquid oxygen by heat exchange against a condensing nitrogen stream removed from a top section of the single distillation column; (c) feeding the condensed, nitrogen stream to a top section of the single distillation column as reflux; and (d) recovering the vaporized oxygen as at least a substantial portion of the oxygen product. The improvement can be further characterized by providing boilup by boiling at least another portion of the liquid oxygen bottoms by heat exchange against a condensing vapor stream, wherein the vapor stream to be condensed in an air stream at a higher pressure than the feed air stream or a recycle nitrogen stream at a pressure greater than the operating pressure of the single distillation column, or by recycling a portion of the oxygen product at a pressure of at least the operating pressure of the single distillation column to the bottom of the distillation column and/or by providing intermediate boilup to the stripping section of the single distillation column system by vaporizing a portion of descending column liquid by heat exchange against another condensing vapor stream, wherein the other vapor stream to be condensed is either an air stream at a higher pressure than the feed air stream or a recycle nitrogen stream at a pressure greater than the operating pressure of the single distillation column.

4. 发明授权

US06263700B1 Multieffect distillation for multicomponent separation 失效
标题翻译：多元蒸馏用于多组分分离
公开(公告)号：US06263700B1
公开(公告)日：2001-07-24
申请号：US09389267
申请日：1999-09-03
申请人： Rakesh Agrawal , Jianguo Xu
发明人： Rakesh Agrawal , Jianguo Xu
IPC分类号： F25J302
CPC分类号： B01D3/146 , F25J3/0219 , F25J3/0233 , F25J3/0257 , F25J3/0261 , F25J3/0295 , F25J3/04309 , F25J3/044 , F25J3/04412 , F25J3/04418 , F25J3/0443 , F25J3/04666 , F25J3/04709 , F25J3/04715 , F25J3/04793 , F25J2200/02 , F25J2200/04 , F25J2200/30 , F25J2200/34 , F25J2200/50 , F25J2200/52 , F25J2200/54 , F25J2200/90 , F25J2210/12 , F25J2235/02 , F25J2235/42 , F25J2245/02 , F25J2245/42 , F25J2290/40
摘要： An efficient multieffect distillation process separates multicomponent mixtures containing three or more components into product streams each enriched in one of the components. The distillation process consists of at least two distillation columns that are thermally linked. A mixture stream that can be the given feed or a stream recovered from another distillation column and containing three or more components is fed to one of the thermally linked distillation columns and at least two submixture streams are produced from this distillation column and transferred to other distillation columns for further distillation. At least one of the submixture streams is transferred to the other thermally linked distillation column. One submixture stream is lean in the least volatile component of the mixture feed and the other submixture stream is lean in the most volatile component of the mixture feed.
摘要翻译：有效的多效蒸馏方法将含有三种或更多种组分的多组分混合物分离成各自富含一种组分的产物流。蒸馏过程由至少两个热连接的蒸馏塔组成。将可以是给定进料或从另一个蒸馏塔回收并含有三种或更多种组分的混合物料流进料到一个热连接的蒸馏塔中，并从该蒸馏塔产生至少两种亚混合物流并转移至其它蒸馏塔用于进一步蒸馏。至少一个副混合流被转移到另一个热连接的蒸馏塔。一个混合物料流在混合物进料的最不易挥发的组分中是贫的，而另一个混合物流在混合物进料的最易挥发组分中是贫的。

5. 发明授权

US5513497A Separation of fluid mixtures in multiple distillation columns 失效
标题翻译：在多个蒸馏塔中分离流体混合物
公开(公告)号：US5513497A
公开(公告)日：1996-05-07
申请号：US375927
申请日：1995-01-20
申请人： Rakesh Agrawal , Jianguo Xu
发明人： Rakesh Agrawal , Jianguo Xu
IPC分类号： F25J3/02 , B01D3/14 , B01D3/26 , F01K23/06 , F02C6/10 , F25J3/04 , F25B9/00
CPC分类号： F25J3/04606 , B01D3/146 , F01K23/068 , F02C6/10 , F25J3/0209 , F25J3/0233 , F25J3/0257 , F25J3/04303 , F25J3/04448 , F25J3/04575 , F25J3/046 , F25J3/04872 , F25J2200/04 , F25J2200/20 , F25J2200/50 , F25J2200/54 , F25J2235/02 , F25J2290/10 , F25J2290/40 , Y02E20/18 , Y10S62/915
摘要： A fluid mixture is separated by distillation in a two column system in which the feed is prefractionated in a first column having at least one separation stage above the feed and the prefractionator bottoms provides feed to a second column operating at a lower pressure. Cooling for condensing the overhead vapor of the first column is provided by heat exchange with flashed prefractionator bottoms or with an intermediate fluid in the second column. The two-column system is readily combined with a high pressure column in a three-column distillation system for separating air which is particularly useful for integration with a gasification combined cycle combustion turbine system. Optionally, three nitrogen products can be produced at three different pressures.
摘要翻译：流体混合物通过蒸馏在两塔系统中分离，其中进料在具有在进料上方的至少一个分离阶段的第一塔中进行初分馏，并且初步分馏塔底部提供进料到在较低压力下操作的第二塔。通过与闪蒸的初步分馏塔底部的热交换或与第二塔中的中间流体进行热交换来提供用于冷凝第一塔的塔顶蒸气的冷却。双塔系统容易地与用于分离空气的三塔蒸馏系统中的高压塔组合，这对于与气化联合循环燃烧涡轮机系统的整合特别有用。任选地，三种氮气产物可以在三种不同的压力下生产。

6. 发明授权

US5165245A Elevated pressure air separation cycles with liquid production 失效
标题翻译：高压空气分离循环与液体生产
公开(公告)号：US5165245A
公开(公告)日：1992-11-24
申请号：US700021
申请日：1991-05-14
申请人： Rakesh Agrawal , Jianguo Xu
发明人： Rakesh Agrawal , Jianguo Xu
IPC分类号： F25J3/04
CPC分类号： F25J3/04181 , F25J3/04284 , F25J3/04296 , F25J3/04315 , F25J3/04393 , F25J3/04412 , F25J3/04672 , F25J3/04733 , F25J2200/20 , F25J2200/54 , F25J2205/02 , F25J2205/60 , F25J2250/20 , Y10S62/939
摘要： The present invention relates to an improvement to a cryogenic process for the separation of air into its constituent components. In the process, a distillation column system having at least two distillation columns, a high pressure distillation column and a low pressure column is used; these two distillation columns are in thermal communication with each other. The low pressure column of the distillation column system operates at a pressure between 9 to 75 psig and a nitrogen product is produced from the top section thereof. At least 50% of the air to the distillation column system is removed as this nitrogen product, which has a nitrogen concentration of at least 95% and is at a pressure of at least 9 psig.The improvement to the process is a series of steps which allows for the production of liquid products from the cryogenic process in an efficient manner. These steps are primarily the partial warming of the nitrogen product, its subsequent isentropic expansion and use of the inherent refrigeration of the expanded nitrogen. These steps can be carried out in three ways.

7. 发明授权

US5341646A Triple column distillation system for oxygen and pressurized nitrogen production 失效
标题翻译：三柱蒸馏系统用于氧气和加压氮气生产
公开(公告)号：US5341646A
公开(公告)日：1994-08-30
申请号：US92164
申请日：1993-07-15
申请人： Rakesh Agrawal , Jeffrey S. Langston , Paul Rodgers , Jianguo Xu
发明人： Rakesh Agrawal , Jeffrey S. Langston , Paul Rodgers , Jianguo Xu
IPC分类号： F25J3/04 , F25J3/02
CPC分类号： F25J3/04206 , F25J3/0409 , F25J3/04303 , F25J3/04315 , F25J3/04351 , F25J3/04454 , F25J2200/20 , F25J2200/50 , F25J2205/02 , F25J2250/40 , F25J2250/50 , Y10S62/90
摘要： The present invention relates to an improved cryogenic process for the separation of air to produce an oxygen product and a nitrogen product. The present invention employs a distillation column system with three distillation columns, a low pressure column, a medium pressure column and a high pressure column. The improved three column distillation system process comprises: (a) producing an oxygen product with a product purity of less than 98% purity oxygen and producing no argon product; (b) producing a gaseous nitrogen product which represents greater than 35% of the feed air and which is removed from the medium and/or high pressure columns; (c) recovering a major portion of the oxygen product from the low pressure column; and (d) condensing at least a portion of the high pressure nitrogen overhead from the high pressure column by heat exchange against a liquid stream in the medium pressure column and utilizing at least a portion of the condensed portion to provide reflux to the high pressure column.
摘要翻译：本发明涉及用于分离空气以产生氧产物和氮产物的改进的低温方法。本发明采用具有三个蒸馏塔，低压塔，中压塔和高压塔的蒸馏塔系统。改进的三塔蒸馏系统方法包括：（a）产生纯度低于98％纯氧的产物氧产物，不产生氩产物; （b）产生代表进料空气大于35％并从介质和/或高压塔中除去的气态氮产物; （c）从低压塔中回收大部分氧产物; 和（d）通过与中压塔中的液流进行热交换将至少一部分高压氮塔顶馏出物冷凝，并利用至少一部分冷凝部分向高压塔提供回流。

8. 发明授权

US5251451A Multiple reboiler, double column, air boosted, elevated pressure air separation cycle and its integration with gas turbines 失效
标题翻译：多重再沸器，双柱，空气增压，高压空气分离循环及其与燃气轮机的集成
公开(公告)号：US5251451A
公开(公告)日：1993-10-12
申请号：US937629
申请日：1992-08-28
申请人： Jianguo Xu , Rakesh Agrawal
发明人： Jianguo Xu , Rakesh Agrawal
IPC分类号： F25J3/04 , F25J3/02
CPC分类号： F25J3/0409 , F25J3/04018 , F25J3/04127 , F25J3/04206 , F25J3/04303 , F25J3/04351 , F25J3/04418 , F25J3/04575 , F25J3/046 , F25J3/04618 , F25J2200/20 , F25J2200/52 , F25J2200/54 , F25J2250/20 , F25J2250/40 , F25J2250/50 , Y10S62/915 , Y10S62/939
摘要： The present invention is a liquid nitrogen reflux means improvement capable of allowing the operation of conventional dual and triple reboiler air separation cycles at elevated pressures. The improvement comprises: (a) further compressing and cooling another portion of the compressed, essentially impurities free, feed air, thereby producing a further compressed second portion; (b) removing and increasing the pressure of a portion of the liquid oxygen bottoms of the second column and heat exchanging the increased pressure liquid oxygen bottoms against at least a fraction of the further compressed second portion of step (a) so that upon heat exchange the fraction of the further compressed second portion of step (a) is at least partially condensed and the increased pressure liquid oxygen bottoms portion is at least partially vaporized; (c) feeding the at least partially condensed fraction of step (b) to at least one of the two distillation columns; (d) warming the at least partially vaporized oxygen of step (b) to recover refrigeration; (e) compressing a portion of the gaseous nitrogen product and cooling it to a temperature near its condensation temperature by heat exchange against warming process streams; and (f) condensing the cooled, compressed gaseous nitrogen product portion of step (e) and feeding the condensed nitrogen portion as reflux to at least one of the distillation columns.

9. 发明授权

US06565628B2 Pressure swing adsorption process with reduced pressure equalization time 有权
标题翻译：变压吸附过程中减压均压时间短
公开(公告)号：US06565628B2
公开(公告)日：2003-05-20
申请号：US09911002
申请日：2001-07-23
申请人： Jianguo Xu , David Lester Rarig , Tracey Ann Cook , Kuo-Kuang Hsu , Michelle Schoonover , Rakesh Agrawal
发明人： Jianguo Xu , David Lester Rarig , Tracey Ann Cook , Kuo-Kuang Hsu , Michelle Schoonover , Rakesh Agrawal
IPC分类号： B01D53047
CPC分类号： B01D53/047 , B01D2253/102 , B01D2253/108 , B01D2256/16 , B01D2257/502 , B01D2257/504 , B01D2257/702 , B01D2259/4003 , B01D2259/40032 , B01D2259/40035 , B01D2259/40041 , B01D2259/40075 , B01D2259/404 , B01D2259/4068 , B01D2259/4145 , C01B3/56 , C01B2203/043 , C01B2203/0465 , C01B2203/047 , C01B2203/0475 , C01B2203/048 , C01B2203/0495 , Y02C10/08 , Y02P20/152
摘要： A method to reduce the cycle time in a pressure swing adsorption process by reducing the required pressure equalization time in a cycle, thereby reducing the overall cycle time and increasing product recovery per unit of adsorbent used. This reduces the amount of adsorbent required in the beds for a given feed rate while continuing to provide product at an acceptable product purity, and has the desirable effect of reducing the capital cost of the process equipment required for a given volumetric production rate.
摘要翻译：通过减少循环中所需的压力平衡时间来减少变压吸附过程中的循环时间的方法，从而减少总体循环时间并提高每单位吸附剂的产物回收率。这降低了给定进料速率下床中所需的吸附剂的量，同时继续以可接受的产物纯度提供产物，并且具有降低给定体积生产速率所需的加工设备的资本成本的期望效果。

10. 发明授权

US5355682A Cryogenic air separation process producing elevated pressure nitrogen by pumped liquid nitrogen 失效
标题翻译：低温空气分离过程通过泵送液氮产生高压氮
公开(公告)号：US5355682A
公开(公告)日：1994-10-18
申请号：US123026
申请日：1993-09-15
申请人： Rakesh Agrawal , Bruce K. Dawson , Jeffrey A. Hopkins , Jianguo Xu
发明人： Rakesh Agrawal , Bruce K. Dawson , Jeffrey A. Hopkins , Jianguo Xu
IPC分类号： F25J3/04 , F25J3/00
CPC分类号： F25J3/04218 , F25J3/04084 , F25J3/0409 , F25J3/04296 , F25J3/04412 , F25J3/0443
摘要： The process of the present invention is a cryogenic air separation process with three important features: (1) at least a portion of a nitrogen-rich liquid from the column system is boosted in pressure before being vaporized and delivered as a product; (2) at least a portion of the feed air is at least partially condensed in indirect heat exchange with the boosted pressure, nitrogen-rich stream; and (3) a portion of the liquid nitrogen condensed from the vapor nitrogen from the top of the higher pressure column is returned to the higher pressure column as reflux with the remaining portion being removed from the column system.
摘要翻译：本发明的方法是具有三个重要特征的低温空气分离方法：（1）至少一部分来自塔系统的富氮液体在被蒸发并作为产物输送之前被加压; （2）至少一部分进料空气与增压的富氮流间接热交换至少部分冷凝; 和（3）从高压塔顶蒸气氮冷凝的一部分液氮返回到高压塔作为回流，其余部分从柱系统中除去。

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