| 摘要 |
#CMT# #/CMT# A method for producing hydrogen- and carbon monoxide-containing gas (oxo gas) (9) by cryogenic separation of a mixture (1) of H 2, CO and methane in a cryogenic gas stripper (K) to give a first, H 2-enriched stream (6) which is heated up (E1, E2), removed from (K) and mixed with at least part (56) of a second, CO-enriched stream (55) (also obtained from the feed (1) in (K)), involves removing (6) from the cooled feed (3) by scrubbing (T5) with a CO-rich liquid (5). #CMT# : #/CMT# An independent claim is included for a system for implementing this method by cryogenic decomposition of (1) as above in a gas stripper (K) containing a methane scrubbing column (T1) and heat exchangers (E1, E2) for cooling and heating process streams, where the system includes a scrubber (T5) in which a first, H 2-enriched gas stream (6) is removed from the cooled feed mixture (3) by washing with CO-enriched liquid (5). #CMT#USE : #/CMT# For the production of hydrogen- and carbon monoxide-containing gas (oxo gas). #CMT#ADVANTAGE : #/CMT# Enables the production of oxo gas with a low content of methane from synthesis gas containing hydrogen, carbon monoxide and methane (the presence of methane may lead to unwanted side-reactions in subsequent processes). The process also yields a carbon monoxide product and crude hydrogen. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a diagram of a plant for the production of oxo gas according to the invention. 1 : synthesis gas feed (containing H 2, CO and methane) 3 : cooled feed 6 : first, hydrogen-enriched stream 9 : oxo gas (product) 15 : crude hydrogen 31 : fuel gas (hydrogen-rich fraction) 39; 5 : liquefied medium and part-stream to scrubber 54 : gas product 55; 56 : CO-enriched gas and part stream 58 : carbon monoxide of product purity 61 : liquid carbon monoxide take-off 65 : nitrogen (to atmosphere) T5 : scrubber E1-E6 : heat exchangers and/or evaporators K : cryogenic gas stripper T1 : methane wash column T2 : hydrogen stripper column T3 : CO-methane separation column V : carbon monoxide storage tank. #CMT#CHEMICAL ENGINEERING : #/CMT# Preferred Method: A CO-enriched stream (57) is circulated through the stripper (K) and liquefied, then a part (5) of the liquefied medium (39) is used for scrubbing (3). CO-enriched gas (58) is condensed (E5) with liquid nitrogen (if it cannot be taken off as part of a gas product (54)) and kept in an intermediate CO-storage tank (V) from which it can be taken off as a liquid (61) when required, evaporated in an evaporator (E6) and added to a gas product (64). The method gives oxo gas with a H 2/CO mol ratio of 1.5-0.66, preferably 1.Preferred Apparatus: The scrubber (T5) is in the form of a scrubbing column with packing and/or substance-exchange trays; the cooled mixture (3) is fed into the bottom of T5 and the first, H 2-rich gas is taken from the top. A phase separator may be fitted before the scrubber (T5), or the lower part of (T5) may be designed as a phase separator, in which the cooled mixture (3) is separated into H 2-rich gas and CO-rich liquid. There is also an intermediate storage system for CO of product purity (58), with two heat exchangers (E5, E6) and a thermally-insulated CO storage tank (V). |
