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    Process for the cryogenic distillation of an air feed to produce an ultra-high purity oxygen product
    1.
    发明授权
    Process for the cryogenic distillation of an air feed to produce an ultra-high purity oxygen product 失效
    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purity oxygen product (ie total contaminant concentration less than 10.0 vppm, preferably less than 1.0 vppm) is withdrawn from an intermediate section of the auxiliary distillation column.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）。

    Cryogenic process for the separation of air to produce moderate pressure nitrogen
    2.
    发明授权
    Cryogenic process for the separation of air to produce moderate pressure nitrogen 失效
    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.

    Process for introducing a multicomponent liquid feed stream at pressure P.sub.2 into a distillation column operating at lower pressure P.sub.1
    5.
    发明授权
    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
    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 。

    Cryogenic process for the separation of air to produce moderate pressure nitrogen
    7.
    发明授权
    Cryogenic process for the separation of air to produce moderate pressure nitrogen 失效
    用于分离空气以产生中等压力氮的低温工艺

    公开(公告)号：US5129932A

    公开(公告)日：1992-07-14

    申请号：US785596

    申请日：1991-10-30

    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： F25J3/04315 ,  F25J3/04212 ,  F25J3/04309 ,  F25J3/04321 ,  F25J3/04412 ,  F25J3/04678 ,  F25J2200/20 ,  F25J2240/44 ,  F25J2245/50 ,  F25J2250/42 ,  F25J2250/50

    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.

    摘要翻译： 本发明涉及一种利用集成的多塔蒸馏系统分离空气的低温方法，其中产生富氮富含富氩产物。 在空气的低温蒸馏分离中，空气最初被压缩，预处理并冷却以分离成其组分。 通过在低压塔的底部实现高沸腾速率，产生中等压力，例如氮气产生纯度提高，氮气和氩气回收率更高，从而产生较低的液体/蒸气 流量比（L / V），并利用比常规氮回流高于低压塔的顶部，其中氮中的氧浓度小于约10ppm体积或氮纯度至少约99.5％ 卷。 通过从废氮气流中回收能量和从低压塔中回收氧气来获得驱动系统的制冷。 用于获得制冷的第二种方法是从低压塔中抽出作为底部液体的氧气，将该液体膨胀到较低的压力，并将其用于冷凝在涡轮膨胀机中膨胀的较高压力塔中产生的氮蒸汽 提供制冷。

    Enhanced recovery of argon from cryogenic air separation cycles
    8.
    发明授权
    Enhanced recovery of argon from cryogenic air separation cycles 失效
    从低温空气分离循环中增强阿尔贡的恢复

    公开(公告)号：US5114449A

    公开(公告)日：1992-05-19

    申请号：US573952

    申请日：1990-08-28

    申请人： Rakesh Agrawal ,  Donald W. Woodward

    发明人： Rakesh Agrawal ,  Donald W. Woodward

    IPC分类号： C01B23/00 ,  F25J3/04

    CPC分类号： F25J3/04672 ,  F25J3/04303 ,  F25J3/04412 ,  F25J3/0469 ,  F25J2200/54 ,  F25J2200/90 ,  F25J2205/02 ,  F25J2235/58 ,  F25J2290/10 ,  Y10S62/924 ,  Y10S62/939

    摘要： The present invention relates to an improvement for the production of argon from cryogenic air separation processes. In particular, the improvement provides a better method of thermally linking the top of the crude argon column with the low pressure column. In the improvement, the argon-rich, overhead vapor from the top of the crude argon column is condensed in a boiler/condenser by indirect heat exchange against liquid descending the low pressure column; a portion of the condensed argon-rich, overhead vapor is returned to the top of the crude argon column to provide reflux. The most suitable location for such boiler/condenser is as an intermediate boiler/condenser in the low pressure column, particularly, the section of the low pressure column bounded by the feed point of the crude liquid oxygen from the bottom of the high pressure column and the vapor feed draw line for the crude argon column wherein an adequate temperature difference exists between the descending liquid and the condensing argon.

    Air separation process for the production of oxygen-rich and nitrogen-rich products
    10.
    发明授权
    Air separation process for the production of oxygen-rich and nitrogen-rich products 失效
    空气分离过程生产富氧和富氮产品

    公开(公告)号：US4936099A

    公开(公告)日：1990-06-26

    申请号：US354173

    申请日：1989-05-19

    申请人： Donald W. Woodward ,  Rakesh Agrawal

    发明人： Donald W. Woodward ,  Rakesh Agrawal

    IPC分类号： F25J3/04

    CPC分类号： F25J3/04103 ,  F25J3/0409 ,  F25J3/04206 ,  F25J3/04284 ,  F25J3/04418 ,  F25J3/0486 ,  F25J2200/54 ,  F25J2205/02 ,  F25J2235/52 ,  F25J2250/20 ,  F25J2250/40 ,  F25J2250/50 ,  F25J2250/52

    摘要： The present invention is an improvement to a two distillation column, cryogenic air separation process which produces nitrogen-rich and oxygen-rich products. The improvement to the process is condensing at least a portion of the nitrogen overhead from the high pressure column in a reboiler/condenser against a crude liquid oxygen stream and in an intermediate reboiler/condenser located in the low pressure column against internal low pressure column streams. The condensed nitrogen overhead is fed either to the low pressure or high pressure columns as reflux. The vaporized portion of the crude liquid oxygen stream is work expanded to provide some or all of the refrigeration required for the process.

    摘要翻译： 本发明是对两个蒸馏塔，低温空气分离方法的改进，其产生富氮和富氧产物。 该方法的改进是将再沸器/冷凝器中的来自高压塔的氮塔顶馏出物的至少一部分与粗液氧流和位于低压塔中的中间再沸器/冷凝器相对于内部低压塔流 。 冷凝的氮气塔顶作为回流进料到低压塔或高压塔。 粗液氧气流的蒸发部分工作膨胀以提供该方法所需的部分或全部制冷。