Method for preparing methanol by coupling semi-coke tail gas and green hydrogen in green electricity

• Main Authors: ZHU BENQI, GAO XIANYI, QI SHUANGCHENG
• Format: Patent
• Language: Chinese; English
• Published: 27.10.2023
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE ORUNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; APPARATUS THEREFOR; CHEMISTRY; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTIONOF COMPOUNDS OR NON-METALS; FIRELIGHTERS; FUELS; FUELS NOT OTHERWISE PROVIDED FOR; LIQUEFIED PETROLEUM GAS; LUBRICANTS; METALLURGY; NATURAL GAS; ORGANIC CHEMISTRY; PEAT; PETROLEUM, GAS OR COKE INDUSTRIES; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BYSUBCLASSES C10G, C10K; TECHNICAL GASES CONTAINING CARBON MONOXIDE

The invention relates to a method for preparing methanol by coupling semi-coke tail gas with green electricity and green hydrogen, which comprises the following steps: the semi-coke tail gas is treated by a pretreatment device, a first-stage compression device, a primary purification device, a second-stage compression device, a sulfur-tolerant shift device and a decarburization device in sequence; carbon dioxide removed by a decarburization device enters a carbon dioxide compression purification device to obtain purified carbon dioxide, shift gas subjected to decarburization treatment enters a cryogenic separation device, methane is separated to serve as an LNG product, and remaining gas enters a downstream hydrogen extraction device; hydrogen obtained after treatment of the hydrogen extraction device serves as raw material gas to be fed into the downstream methanol synthesis device, green electricity generated in a new energy power generation mode supplies power to the water electrolysis device, another stra