乙二醇胺化合成哌嗪催化剂及工艺

摘要

The synthesis of piperazine via amination reaction was conducted in a fixed bed reactor using ethylene glycol as raw material. The active components and supportsof the catalyst were screened. The effects of reaction temperature, reaction pressure, liquid hourly space velocity of ethylene glycol, molar ratio of ammonia to glycol and molar ratio of hydrogen to glycol on amination reaction were systemically investigated. The results indicated that Ni-Cu bimetal composite was the appropriate active component and mordenite zeolite as support presented higher selectivity for the synthesis of piperazine. Under the conditions of reaction temperature of 230℃, reaction pressure of 10 MPa, liquid hourly space velocity of ethylene glycol 0.2 h-1, molar ratio of ammonia to glycol 30, and molar ratio of hydrogen to glycol 1, amination reaction proceeded smoothly with the glycol conversion of 42% and piperazine selectivity of 75%.%在固定床反应器中，以乙二醇为原料，胺化合成哌嗪。对催化剂活性组分及载体进行了筛选，并系统地考察了反应温度、压力、乙二醇空速、氨醇物质的量之比和氢醇物质的量之比等对胺化反应的影响。结果表明，Ni-Cu复合金属是合成哌嗪较好的活性组分，丝光沸石作为载体哌嗪选择性较高。在反应温度230℃，压力10 MPa，乙二醇液时空速0.2 h-1，氨醇物质的量之比为30，氢醇物质的量之比为1的条件下，乙二醇胺化合成哌嗪反应性能较好，乙二醇转化率为42%，哌嗪选择性为75%。