System for preparing hydrocarbon by virtue of high-temperature electrolysis of CO2/H2O and application thereof

• Main Authors: SONG HUA, LI JINLIAN, WU HONGJUN, JI DEQIANG, LI FENG, WANG BAOHUI, YI GUANLIN
• Format: Patent
• Language: English
• Published: 29.04.2015
• Subjects: APPARATUS THEREFOR; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTIONOF COMPOUNDS OR NON-METALS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The invention relates to a system for preparing hydrocarbon by virtue of high-temperature electrolysis of CO2/H2O and application thereof. The system comprises an electrolysis unit and an electrical heating unit used for heating the electrolysis unit, wherein the electrolysis unit comprises a direct current power supply, a cathode, an anode, an electrolytic tank and an electrolyte, wherein the electrolyte is a mixture of molten carbonates and molten hydroxides, or a mixture of molten carbonates and molten oxides, or a mixture of molten carbonates, molten hydroxides and molten oxides. In electrolysis, the current of the direct current power supply is in (0A-3A) range, the temperature of the electrolytic tank is not less than 450 DEG C, and the electrolyte is regenerated by absorbing CO2/H2O in air. By the system, the preparation of hydrocarbon by virtue of co-electrolysis of CO2/H2O under the conditions of low electrolysis voltage and relatively low temperature is achieved, the electrolysis reaction is relatively simple, the reaction selectivity is good, and the CO2 resource utilization can be simply and efficiently achieved in energy-saving and low-cost manners.