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    Elevated pressure air separation cycles with liquid production
    6.
    发明授权
    Elevated pressure air separation cycles with liquid production 失效
    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.

    Triple column distillation system for oxygen and pressurized nitrogen production
    7.
    发明授权
    Triple column distillation system for oxygen and pressurized nitrogen production 失效
    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 。

    Multiple reboiler, double column, air boosted, elevated pressure air separation cycle and its integration with gas turbines
    8.
    发明授权
    Multiple reboiler, double column, air boosted, elevated pressure air separation cycle and its integration with gas turbines 失效
    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.

    Process and apparatus for the production of moderate purity oxygen
    10.
    发明授权
    Process and apparatus for the production of moderate purity oxygen 失效
    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。