Coal liquefaction reaction system and method for purifying hydrogen in direct coal liquefaction process

• Main Author: DU HAISHENG
• Format: Patent
• Language: Chinese; English
• Published: 12.04.2022
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; CRACKING HYDROCARBON OILS; FUELS; INORGANIC CHEMISTRY; LUBRICANTS; METALLURGY; MINERAL WAXES; NON-METALLIC ELEMENTS; PEAT; PETROLEUM, GAS OR COKE INDUSTRIES; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVEHYDROGENATION, OLIGOMERISATION, POLYMERISATION; PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLEGASES CONTAINING CARBON MONOXIDE; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, ORGASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; TECHNICAL GASES CONTAINING CARBON MONOXIDE

The invention relates to the technical field of direct coal liquefaction, in particular to a coal liquefaction reaction system and a method for purifying hydrogen in a direct coal liquefaction process, the coal liquefaction reaction system comprises a coal liquefaction reaction system, a separation system, a liquid removal system and a hydrogen purification system; the hydrogen purification system comprises a first-stage membrane separation unit used for carrying out primary membrane separation on hydrogen-rich purified gas to obtain high-purity hydrogen and first tail gas, and the permeation side of the first-stage membrane separation unit is communicated with the coal liquefaction reaction system through a third pipeline; the secondary membrane separation unit is used for carrying out secondary membrane separation on the first tail gas to obtain second hydrogen and second tail gas; the desulfurization unit is used for carrying out desulfurization treatment on the second hydrogen; and the crossover line is c