公开(公告)号：US5351492A

公开(公告)日：1994-10-04

申请号：US950116

申请日：1992-09-23

申请人： Rakesh Agrawal ,  Ajay K. Modi ,  William T. Kleinberg

发明人： Rakesh Agrawal ,  Ajay K. Modi ,  William T. Kleinberg

IPC分类号： C01B21/04 ,  F25J3/04 ,  F25J3/02

CPC分类号： F25J3/044 ,  F25J3/04048 ,  F25J3/0406 ,  F25J3/04212 ,  F25J3/04278 ,  F25J3/04284 ,  F25J3/04309 ,  F25J3/04333 ,  F25J3/04351 ,  F25J3/04412 ,  F25J3/04793 ,  F25J2200/30 ,  F25J2200/50 ,  F25J2200/72 ,  F25J2200/74 ,  F25J2200/94 ,  F25J2215/44 ,  F25J2220/42 ,  F25J2220/44 ,  F25J2230/08 ,  F25J2245/42 ,  F25J2250/20 ,  F25J2270/02 ,  F25J2270/12 ,  F25J2290/12 ,  Y10S62/92

摘要： The present invention relates an improvement to a cryogenic process for the separation of air which produces at least a nitrogen product and is carried out in a distillation column system having at least one distillation column from which the nitrogen product is produced. The distillation column of the distillation column system must comprise a rectifying section. In the process of the present invention, air is compressed, freed of impurities which will freeze out at cryogenic temperatures, cooled to near its dew point and fractionated in the distillation column system to produce the nitrogen product.The improvement is the operation of the distillation column such that the ratio of downward liquid to upward vapor flow rate (L/V) is no less than 0.65, preferably greater than 0.75, but less than 1.0 in the rectifying section of a distillation column from which the nitrogen product is produced. The flowrates are in moles per unit time.

摘要翻译： 本发明涉及一种用于分离产生至少氮产物的空气的低温方法的改进，并且在具有至少一个蒸馏塔的蒸馏塔系统中进行，所述蒸馏塔从其中产生氮产物。 蒸馏塔系统的蒸馏塔必须包括整流段。 在本发明的方法中，空气被压缩，不含将在低温下冷冻的杂质，冷却至接近露点并在蒸馏塔系统中分馏以产生氮产物。 改进是蒸馏塔的操作，使得在蒸馏塔的精馏段中向下液体与向上蒸气流量（L / V）的比例不小于0.65，优选大于0.75，但小于1.0， 氮产品生产。 流量以每单位时间的摩尔数计。