| 摘要 |
Crude gas mainly consisting of hydrogen and carbon monoxide and deriving from the gasification of coal or crude oil fractions, is cooled under 0 DEG C, and methanol is injected to remove water and other condensable components from the crude gas, whereafter the gas, after further cooling, is scrubbed by m-xylene at 25 ata to 100 ata and at -5 DEG C and -35 DEG C so that in the scrubber all sulphur compounds are removed. A minor part of the sulphur-free gas is treated in a CO-conversion plant, in which the carbon monoxide and water are converted to H2 and CO2 and scrubbed with methanol to reduce the CO2 content in the gas to ca. 2%. The resulting converted and methanol- scrubbed gas is then mixed with the main gas stream, which does not flow through the CO-conversion plant, to form the synthesis gas having a ratio H2 : CO=2 : 1 and a CO2 content of about 5%. |
