公开(公告)号：US20190321772A1

公开(公告)日：2019-10-24

申请号：US16387725

申请日：2019-04-18

Applicant: Linde Aktiengesellschaft

Inventor： Dimitri GOLUBEV

IPC: B01D53/04 ,  B01D53/047 ,  F25J3/04

Abstract: A method for cryogenic separation of air uses an air separation plant, wherein, in a mass transfer column, a liquid first fluid and a gaseous second fluid are subjected to mass transfer with one another. A gaseous third fluid is removed from the column and is at least partly discharged from the air separation plant. A liquid fourth fluid is removed from the column and is at least partly fed into a low-pressure column. The first fluid is formed using at least a part of an oxygen-rich liquid removed from the low-pressure column. The second fluid is formed using an oxygen-enriched liquid removed from a high-pressure column. The oxygen-enriched liquid removed from the high-pressure column and bottom liquid of the mass transfer column are mixed and partly evaporated in a condenser-evaporator. A liquid fifth fluid is removed from the mass transfer column between a feed point for the first fluid and a feed point for the oxygen-enriched liquid, and is at least partly fed into the low-pressure column. The fifth fluid or a fraction thereof is fed into the low-pressure column below the fourth fluid or a fraction thereof.

公开(公告)号：US20180347900A1

公开(公告)日：2018-12-06

申请号：US15995742

申请日：2018-06-01

Applicant: LINDE AKTIENGESELLSCHAFT

Inventor： Dimitri GOLUBEV

IPC: F25J3/04

CPC classification number: F25J3/04175 ,  F25J3/0406 ,  F25J3/04084 ,  F25J3/0409 ,  F25J3/04296 ,  F25J3/04351 ,  F25J3/04381 ,  F25J3/04393 ,  F25J3/04412 ,  F25J3/04678 ,  F25J3/04727 ,  F25J2200/92 ,  F25J2215/54 ,  F25J2240/46

Abstract: The invention proposes a process and an air separation plant comprising a rectification column system comprising a high-pressure column, a low-pressure column, a main heat exchanger, and a main air compressor. The total air supplied to the rectification column system is compressed in the main air compressor to a first pressure level. The high-pressure column is operated at a second pressure level, at least 3 bar below the first pressure level. A gaseous, nitrogen-rich fluid is removed from the high-pressure column and warmed up in the gaseous state without prior liquefaction. A first partial quantity of the gaseous, nitrogen-rich fluid is warmed to a first temperature level of −150 to −100° C., supplied at this first temperature level to a booster and compressed further to a third pressure level. The first partial quantity is then warmed to a second temperature level and discharged from the air separation plant.

公开(公告)号：US20180023890A1

公开(公告)日：2018-01-25

申请号：US15548890

申请日：2016-02-18

Applicant: LINDE AKTIENGESELLSCHAFT

Inventor： Dimitri GOLUBEV

IPC: F25J3/04

CPC classification number: F25J3/04054 ,  F25J3/04018 ,  F25J3/0403 ,  F25J3/0406 ,  F25J3/04133 ,  F25J3/04145 ,  F25J3/04187 ,  F25J3/04321 ,  F25J3/04393 ,  F25J3/04412 ,  F25J3/04575 ,  F25J3/04854 ,  F25J3/0486 ,  F25J3/04878 ,  F25J3/04915 ,  F25J3/04987 ,  F25J2200/20 ,  F25J2200/54 ,  F25J2200/94 ,  F25J2235/42 ,  F25J2235/50 ,  F25J2240/04 ,  F25J2240/44 ,  F25J2245/42 ,  F25J2250/02 ,  F25J2250/04 ,  F25J2290/12

Abstract: A method and apparatus to obtain a compressed nitrogen product by low-temperature fractionation of air in a distillation column system. The system has a high-pressure column, a low-pressure column, a main condenser, and a low-pressure column top condenser. Bottoms liquid from the low-pressure column is evaporated in the top condenser and the gas formed is decompressed to perform work that drives a cold compressor. A gaseous first compressed nitrogen product stream from the high-pressure column is warmed in the main heat exchanger. A further gaseous nitrogen stream from the low-pressure column is compressed in the cold compressor and warmed as a second compressed nitrogen product stream in the main heat exchanger. The cold compressor overcomes a pressure differential which is at least equal to two thirds of the pressure differential between the top of the high-pressure column and the top of the low-pressure column.

公开(公告)号：US20190242646A1

公开(公告)日：2019-08-08

申请号：US16265120

申请日：2019-02-01

Applicant: LINDE AKTIENGESELLSCHAFT

Inventor： Dimitri GOLUBEV

IPC: F25J3/02 ,  F25J3/04

CPC classification number: F25J3/04321 ,  F25J3/04181 ,  F25J3/0423 ,  F25J3/04412 ,  F25J3/04854 ,  F25J2200/20 ,  F25J2200/54 ,  F25J2200/94 ,  F25J2230/42 ,  F25J2230/50 ,  F25J2230/52 ,  F25J2235/42 ,  F25J2245/42 ,  F25J2250/02

Abstract: The distillation column system has a high-pressure column, a low-pressure column, a main condenser and a low-pressure-column top condenser. Feed air is cooled in a main heat exchanger and introduced into the high-pressure column. An oxygen-enriched liquid stream is withdrawn from the high-pressure column and introduced into the low-pressure column. A gaseous nitrogen stream is withdrawn from the high-pressure column, warmed in the main heat exchanger and withdrawn as gaseous pressurized nitrogen product. The high-pressure column has a barrier-plate section arranged immediately above the point at which the feed air is introduced. The oxygen-enriched liquid stream is withdrawn from the high-pressure column above the barrier-plate section. A purge stream is withdrawn below the barrier-plate section. The gaseous nitrogen stream, before being warmed in the main heat exchanger, is warmed in a counter-current subcooler in indirect heat exchange with the oxygen-enriched liquid stream from the high-pressure column.