新型离子电极用于煤基甲醇溶液中微量铬测定  

New Ion Electrode for Determination of Trace Chromium in Methanol Based on Coal

作　　者：李吉辉 LI Ji-hui(Shenhua Yulin Energy Chemical Co.,Ltd.,Yulin 719319,China)

机构地区：[1]神华榆林能源化工有限公司,陕西榆林719319

出　　处：《化学试剂》2020年第6期673-676,共4页Chemical Reagents

摘　　要：煤基甲醇制烯烃是以煤为原料合成甲醇,然后通过甲醇制取低碳烯烃。以煤代油生产低碳烯烃是实现中国能源战略,保证国家能源安全的重要途径之一。近年来,煤基甲醇制烯烃技术在我国得到了快速发展和应用,煤基甲醇根据其不同的工艺特点,产品甲醇溶液中存在的微量铬等重金属离子严重影响煤基甲醇制烯烃催化剂的使用性能。以乙基香兰素和1,3-二氨基硫脲合成的席夫碱乙基香兰素缩-1,3-二氨基硫脲为中性载体,将其与碳粉混合,以液体石蜡为粘合剂,制备了新型的铬(Ⅲ)离子电极。室温下,以饱和甘汞电极作参比电极,离子电极作指示电极,对煤基甲醇中的Cr3+进行测定,取得了较好的效果。Methanol based on coal to olefins,is the synthesis of methanol from the coal,and then the preparation of low-carbon olefin from methanol.Production of low-carbon olefins using coal instead of oil,which is realizing China′s energy strategy of coal for oil,is one of the important ways to ensure national energy security.In recent years,the alternative route for the production of methanol from coal as raw material to produce olefins has been highly valued by academic and industrial circles in China.Because of the differentiation processes of coal-based methanol,there were different trace presence of heavy metal,such as chromium,et al,which influence the performance of catalyst of coal-based methanol to olefin seriously.A sensitive film of carbon paste doped with ethyl vanillin-1,3-diamino-2-thiourea which was synthesized using the reaction of ethyl vanillin with 1,3-diamino-2-thiourea as a film carrier,was prepared and investigated as a new Cr(Ⅲ)-selective electrode.At room temperature,it was used as indicator electrode,with the saturated calomel electrode as reference electrode.The chromium in methanol solution based on coal was tested using this electrode,and got the good result.

关 键 词：离子电极 乙基香兰素缩-1 3-二氨基硫脲 铬(Ⅲ) 煤基甲醇 甲醇制烯烃 

分 类 号：O6[理学—化学]