Na2CO3-K2CO3熔盐法同时制取合成气和金属锌

针对传统的甲烷转化制合成气及金属锌制备技术的缺陷，提出了一种新型的熔融盐反应体系，在熔融盐反应器中以熔融盐(质量比为1:1的Na2CO3/K2CO3)为反应介质对CH4与ZnO反应同时生成金属锌和合成气作了实验研究，利用气相色谱对气体组分进行了分析. 结果表明，反应尾气组分主要是H2, CO和CH4，未检测到CO2，其中合成气的量及H2/CO比例随反应温度的升高而增加，在1198 K左右获得了H2/CO比为2的合成气. 合成气和金属锌分别从气相和熔融盐中获得. 用XRD, SEM及EDS对金属锌产品和熔融盐进行了表征，发现反应后的熔融盐含有少量Na2O和NaOH，来自于CH4与熔融盐之间的微弱反应，由此推断熔融盐还具有消碳功能.

Co-production of Synthesis Gas and Zn with Na2CO3-K2CO3 Molten Salt Medium

For solving the conventional technological problems of methane conversion and metallic zinc production process, a novel molten salt reaction system was proposed. In this work, the reaction of zinc oxide with methane in a molten salt (Na2CO3/K2CO3 mass ratio is 1:1) medium was studied in a molten salt reactor with a gas chromatography (GC) analysis system. The GC analysis results of exhaust revealed that the gaseous components were H2, CO and CH4, and CO2 was not detected. Both the synthesis gas concentration and the ratio of H2 to CO (H2/CO) increased with increasing of reaction temperature, a H2/CO ratio of about 2 was achieved at 1198 K. Metallic zinc and synthesis gas were obtained separately from the gas phase and molten salt. After the reaction completed, the product of metallic zinc was successfully collected in the molten salt and characterized by XRD, SEM and EDS. Finally, analysis results of molten salt after reaction showed that there was a small amount of Na2O and NaOH by the XRD detection, which came from the faint reaction between methane and molten salt, thus the molten salt had a function of consuming carbon.