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1. 发明授权

US5006139A Cryogenic air separation process for the production of nitrogen 失效
标题翻译：低温空气分离过程用于生产氮气
公开(公告)号：US5006139A
公开(公告)日：1991-04-09
申请号：US491420
申请日：1990-03-09
申请人： Rakesh Agrawal , Donald W. Woodward
发明人： Rakesh Agrawal , Donald W. Woodward
IPC分类号： F25J3/04
CPC分类号： F25J3/042 , F25J3/0406 , F25J3/04181 , F25J3/04212 , F25J3/0423 , F25J3/0429 , F25J3/04303 , F25J3/04351 , F25J3/04418 , F25J2200/34 , F25J2200/54 , F25J2215/40 , F25J2245/02 , Y10S62/939
摘要： The present invention is a cryogenic process for the production of nitrogen by distilling air in a double column distillation system comprising a high pressure column and a low pressure column. The critical step of the invention is the condensation of two nitrogen streams at different pressures in two reboiler/condensers located in the stripping section of the low pressure column to provide column reboil. The lower pressure of the two nitrogen streams is condensed in the upper of the two reboiler/condensers; the higher pressure nitrogen stream in the lower of the two reboiler/condensers.

2. 发明授权

US5425241A Process for the cryogenic distillation of an air feed to produce an ultra-high purity oxygen product 失效
标题翻译：用于空气进料的低温蒸馏以产生超高纯度氧产物的方法
公开(公告)号：US5425241A
公开(公告)日：1995-06-20
申请号：US241247
申请日：1994-05-10
申请人： Rakesh Agrawal , Donald W. Woodward
发明人： Rakesh Agrawal , Donald W. Woodward
IPC分类号： F25J3/04
CPC分类号： F25J3/04715 , F25J2200/06 , F25J2200/32 , F25J2200/34 , F25J2200/90 , F25J2215/56 , Y10S62/924
摘要： A process is set forth for the cryogenic distillation of an air feed to produce an ultra-high purity oxygen product. A first oxygen-containing but heavy contaminants-lean (free) stream is removed from the main distillation column system and subsequently stripped in an auxiliary distillation column. A second oxygen-containing but light contaminants-lean (free) gaseous stream is also removed from the main distillation column system and subsequently fed to the bottom section of the auxiliary distillation column in order to provide heat duty/reboil to the bottom of the auxiliary distillation column. The ultra-high purity oxygen product (ie total contaminant concentration less than 10.0 vppm, preferably less than 1.0 vppm) is withdrawn from an intermediate section of the auxiliary distillation column.
摘要翻译：阐述了用于空气进料的低温蒸馏以产生超高纯度氧产物的方法。从主蒸馏塔系统中除去第一含氧但重的污染物（游离）物流，随后在辅助蒸馏塔中汽提。还有从主蒸馏塔系统中除去第二个含氧但轻质污染物（自由）的气流，随后将其送入辅助蒸馏塔的底部，以便向辅助蒸馏塔的底部提供热负荷/再沸腾蒸馏塔。从辅助蒸馏塔的中间部分排出超高纯度氧产物（即总污染物浓度小于10.0vppm，优选小于1.0vppm）。

3. 发明授权

US5077978A Cryogenic process for the separation of air to produce moderate pressure nitrogen 失效
标题翻译：用于分离空气以生产中等压力氮的低温方法
公开(公告)号：US5077978A
公开(公告)日：1992-01-07
申请号：US537181
申请日：1990-06-12
申请人： Rakesh Agrawal , Donald W. Woodward
发明人： Rakesh Agrawal , Donald W. Woodward
IPC分类号： F25J3/04
CPC分类号： F25J3/042 , F25J3/04212 , F25J3/04309 , F25J3/04315 , F25J3/04412 , F25J3/04678 , F25J2200/20 , F25J2240/44 , F25J2245/50 , F25J2250/50 , Y10S62/924
摘要： This invention relates to a cryogenic process for the separation of air utilizing an integrated multi-column distillation system wherein a nitrogen rich, oxygen rich and argon rich product are generated. In the cryogenic distillation separation of air, air is initially compressed, pretreated and cooled for separation into its components. Moderate pressure, e.g., 25-80 psia nitrogen is generated with enhanced nitrogen product purity and greater recovery of both nitrogen and argon by effecting a high boil-up rate in the bottom of the lower pressure column, thereby creating a reduced liquid flow/vapor flow ratio (L/V) and utilizing a higher than customary nitrogen reflux to the top of the lower pressure column, where the concentration of oxygen in nitrogen is less than about 10 ppm by volume or the nitrogen purity is at least about 99.5% by volume. Refrigeration to drive the system is obtained by recovering the energy from the waste nitrogen stream and oxygen vapor from the lower pressure column. A second method for obtaining refrigeration is to withdraw oxygen as a bottoms liquid from the lower pressure column, expanding that liquid to a lower pressure and using it to condense the nitrogen vapor generated in a higher pressure column which has been expanded in a turbo-expander to provide the refrigeration.

4. 发明授权

US4994098A Production of oxygen-lean argon from air 失效
标题翻译：从空气中生产贫氧氩
公开(公告)号：US4994098A
公开(公告)日：1991-02-19
申请号：US474431
申请日：1990-02-02
申请人： Rakesh Agrawal , Donald W. Woodward
发明人： Rakesh Agrawal , Donald W. Woodward
IPC分类号： F25J3/04 , F25J3/08
CPC分类号： F25J3/04921 , F25J3/04303 , F25J3/04369 , F25J3/04412 , F25J3/04678 , F25J2205/02 , F25J2230/58 , F25J2290/10 , Y10S62/906 , Y10S62/924 , Y10S62/939
摘要： The present invention is an improvement to a method of producing crude argon directly from the cold box of a cryogenic air separation unit. The improvement is the production of crude argon containing greatly decreased concentrations of oxygen, i.e.

5. 发明授权

US5275003A Hybrid air and nitrogen recycle liquefier 失效
标题翻译：混合空气和氮气循环液化器
公开(公告)号：US5275003A
公开(公告)日：1994-01-04
申请号：US916566
申请日：1992-07-20
申请人： Rakesh Agrawal , Donald W. Woodward , Jianguo Xu
发明人： Rakesh Agrawal , Donald W. Woodward , Jianguo Xu
IPC分类号： F25J3/04 , F25J3/02
CPC分类号： F25J3/04678 , F25J3/04296 , F25J3/04345 , F25J3/04351 , F25J3/04393 , F25J3/04412 , F25J2200/52 , F25J2205/02 , F25J2245/42 , Y10S62/924 , Y10S62/939
摘要： The present invention relates to a process producing large quantities of liquid product via the cryogenic distillation of air wherein at least a portion of the refrigeration needs of the process is provided by expansion of the feed air. In particular, the present invention is an improved method to meet the liquid nitrogen requirements of the process and comprises elevating the discharge pressure of the nitrogen recycle compressor.
摘要翻译：本发明涉及通过空气的低温蒸馏产生大量液体产物的方法，其中通过进料空气的膨胀来提供该方法的制冷需求的至少一部分。特别地，本发明是一种改进方法，以满足该方法的液氮要求，并且包括提高氮气再循环压缩机的排出压力。

6. 发明授权

US5230217A Inter-column heat integration for multi-column distillation system 失效
标题翻译：多列蒸馏系统的柱间热积分
公开(公告)号：US5230217A
公开(公告)日：1993-07-27
申请号：US885580
申请日：1992-05-19
申请人： Rakesh Agrawal , Donald W. Woodward
发明人： Rakesh Agrawal , Donald W. Woodward
IPC分类号： B01D3/14 , F25J3/04
CPC分类号： F25J3/04303 , F25J3/04412 , F25J3/04709 , F25J2200/50 , F25J2200/54 , F25J2205/02 , F25J2245/02 , Y10S62/924
摘要： This invention relates to an improvement in a process for the separation of a multi-component stream comprising component A, B and C with A being the most volatile and C the least volatile. A multi-component feed is introduced to a multicolumn distillation system comprising a first or main distillation column and a side column wherein at least a light component A is separated from a heavier component C in the main distillation column, the lighter component A being removed as an overhead fraction and the heavier component C being removed as a bottoms fraction. The improvement for enhanced recovery of component B in the side column comprises withdrawing a liquid fraction from the main distillation column at a point intermediate the overhead and feed and introducing that liquid fraction to an upper portion of the side column. Lighter components are withdrawn as an overhead from the side column and returned to an optimal location in the distillation system, typically the main distillation column. A vapor fraction is also withdrawn from the main distillation column at a point intermediate the bottoms and feed and vapor fraction is introduced to a lower portion of the side column. A liquid fraction is withdrawn as bottoms and returned to the main distillation column. Thermal integration in the side column is effected by removing a portion of the liquid typically from the stripping section of the side column and vaporizing this fraction against a vapor fraction obtained from the main distillation column.
摘要翻译：本发明涉及分离包含组分A，B和C的多组分流的方法的改进，其中A是最易挥发的，C是最不易挥发的。将多组分进料引入到包含第一或主蒸馏塔和侧塔的多列蒸馏系统中，其中至少轻组分A与主蒸馏塔中的较重组分C分离，较轻组分A被除去为顶部馏分和较重的组分C作为塔底馏分除去。侧柱中组分B的增强回收的改进包括在塔顶馏出物的中间点从主蒸馏塔中取出液体馏分，并将该液体馏分引入侧塔的上部。较轻的组分作为塔顶馏出物从侧柱排出并返回到蒸馏系统（通常为主蒸馏塔）中的最佳位置。蒸汽馏分也从底部馏分中间点的主蒸馏塔排出，进料和蒸汽馏分被引入侧塔的下部。将液体馏分作为塔底馏出物返回主蒸馏塔。通过从侧塔的汽提部分除去一部分液体并使该馏分相对于从主蒸馏塔获得的蒸气馏分蒸发来实现侧塔中的热积分。

7. 发明授权

US5224336A Process and system for controlling a cryogenic air separation unit during rapid changes in production 失效
标题翻译：控制生产过程中快速变化的低温空气分离单元的过程和系统
公开(公告)号：US5224336A
公开(公告)日：1993-07-06
申请号：US718504
申请日：1991-06-20
申请人： Rakesh Agrawal , David M. Espie , Declan P. O'Connor , Jorge A. Mandler , Arthur R. Smith , Donald W. Woodward
发明人： Rakesh Agrawal , David M. Espie , Declan P. O'Connor , Jorge A. Mandler , Arthur R. Smith , Donald W. Woodward
IPC分类号： F25J3/04 , F25J3/06
CPC分类号： F25J3/046 , F25J3/04351 , F25J3/04412 , F25J3/0449 , F25J3/04545 , F25J3/04563 , F25J2245/42 , F25J2290/10 , F25J2290/62
摘要： A process and system for controlling a cryogenic air separation unit during rapid changes in production. During operation of an air separation unit, demands for oxygen will vary and the pressure of the feed air will fluctuate. The changes in oxygen demand and feed air pressure translate into a ramping, either up or down, of the distillation system pressure in the air separation unit. Because the product streams have tight purity requirements, the ramping system pressure (which could adversely affect product purity) is compensated for. This compensation is by way of a net transfer of refrigeration, in the form of liquid nitrogen, into and out of the distillation system. This transfer of refrigeration is implemented using a storage vessel of liquid nitrogen connected to the reflux path of the distillation system. Liquid nitrogen via the reflux path is removed and stored or added to the distillation system to decrease or increase the refrigeration, respectively.

8. 发明授权

US5049173A Production of ultra-high purity oxygen from cryogenic air separation plants 失效
标题翻译：从低温空气分离设备生产超高纯度氧气
公开(公告)号：US5049173A
公开(公告)日：1991-09-17
申请号：US490017
申请日：1990-03-06
申请人： Thomas E. Cormier, Sr. , Rakesh Agrawal , Alan L. Prentice , Donald W. Woodward
发明人： Thomas E. Cormier, Sr. , Rakesh Agrawal , Alan L. Prentice , Donald W. Woodward
IPC分类号： F25J3/04
CPC分类号： F25J3/04709 , F25J3/04284 , F25J3/04303 , F25J3/04321 , F25J3/04412 , F25J3/0443 , F25J3/04454 , F25J3/04715 , F25J3/04872 , F25J3/04878 , F25J2200/06 , F25J2200/32 , F25J2200/34 , F25J2200/50 , F25J2200/90 , F25J2205/02 , F25J2215/50 , F25J2215/56 , F25J2245/02 , F25J2245/58 , F25J2250/20 , Y10S62/924 , Y10S62/939
摘要： The present invention relates to an improvement for the production of ultra-high purity oxygen from cryogenic air separation processes which produce nitrogen and/or commercial purity oxygen products. In particular, the improvement comprises removing or producing an oxygen-containing but heavy contaminant-lean (free, stream from one of the distillation columns of a single or multiple column cryogenic air separation facility and further stripping the removed or produced oxygen-containing stream in a fractionator to produce ultra-high purity oxygen (i.e., contaminant concentration

9. 发明授权

US5634356A Process for introducing a multicomponent liquid feed stream at pressure P.sub.2 into a distillation column operating at lower pressure P.sub.1 失效
标题翻译：将在压力P2下的多组分液体进料流引入到在较低压力P1下操作的蒸馏塔中的方法
公开(公告)号：US5634356A
公开(公告)日：1997-06-03
申请号：US563416
申请日：1995-11-28
申请人： Rakesh Agrawal , Donald W. Woodward
发明人： Rakesh Agrawal , Donald W. Woodward
IPC分类号： F25J3/02 , F25J3/04 , F25J3/00
CPC分类号： F25J3/04678 , F25J3/0423 , F25J3/044 , F25J3/04412 , F25J2200/90 , F25J2240/42 , F25J2240/44 , F25J2240/48 , F25J2270/02 , F25J2290/10 , Y10S62/924
摘要： A process is set forth for introducing a multicomponent liquid feed stream at pressure P.sub.2 into a distillation column operating at lower pressure P.sub.1. The process comprises removing a split stream from the feed stream, reducing its pressure and using the resulting stream to subcool the feed stream. After being subcooled, the feed stream is also reduced in pressure and both streams are fed to different stages of the distillation column. An important embodiment of the present invention is within the standard double column air separation cycle where the multicomponent liquid stream is the crude liquid oxygen stream from the bottom of the high pressure column which must be reduced in pressure prior to its introduction into the low pressure column.
摘要翻译：介绍了一种将压力P2下的多组分液体进料流引入到在较低压力P1下运行的蒸馏塔中的方法。该方法包括从进料流中除去裂解流，降低其压力并使用所得流将冷却进料流。在过冷却之后，进料流也在压力下降低，两股料流被送入蒸馏塔的不同阶段。本发明的一个重要实施方案在标准双塔空气分离循环内，其中多组分液体流是从高压塔底部的粗液氧流，其在引入低压塔之前必须减压。

10. 发明授权

US5442925A Process for the cryogenic distillation of an air feed to produce a low to medium purity oxygen product using a single distillation column system 失效
标题翻译：使用单一蒸馏塔系统进行空气进料的低温蒸馏以产生低至中等纯度的氧气产物的方法
公开(公告)号：US5442925A
公开(公告)日：1995-08-22
申请号：US259086
申请日：1994-06-13
申请人： Rakesh Agrawal , Leigh A. Stapf , Donald W. Woodward
发明人： Rakesh Agrawal , Leigh A. Stapf , Donald W. Woodward
IPC分类号： F25J3/04 , F25J3/02
CPC分类号： F25J3/04884 , F25J3/04284 , F25J3/04296 , F25J3/04309 , F25J3/044 , F25J3/04939 , F25J2200/50 , F25J2205/04 , F25J2250/10 , F25J2250/20
摘要： A process is set forth for the cryogenic distillation of an air feed to produce a low to medium purity oxygen product using a single distillation column system. The air feed is partially condensed into a crude liquid oxygen stream and a remaining nitrogen-enriched vapor stream by boiling the liquid phase at the bottom of the distillation column. The pressure of the crude liquid oxygen stream is reduced and the nitrogen-enriched vapor stream is subsequently condensed against it to provide reflux to the top of the distillation column. The low to medium purity oxygen product (oxygen concentration between 65% and 99%) is withdrawn from the bottom of the distillation column as liquid, vapor or a combination of both.
摘要翻译：阐述了使用单一蒸馏塔系统进行空气进料的低温蒸馏以产生低至中等纯度的氧产物的方法。通过在蒸馏塔的底部沸腾液相，将空气进料部分冷凝成粗液氧流和剩余的富氮蒸气流。粗液氧流的压力降低，并且富氮蒸汽流随后与其冷凝，以提供回流到蒸馏塔的顶部。将低至中等纯度的氧气产物（氧浓度在65％至99％之间）从蒸馏塔的底部作为液体，蒸气或两者的组合排出。

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