Study on the Catalytic Process of Preparing <i>N</i>-Methylpyrrolidone from Pure Methylamine

本文研究了以纯甲胺和γ-丁内酯为原料，通过一步法制备高纯度N-甲基吡咯烷酮(NMP)的工艺过程。实验中采用自主研发的改型分子筛稀土铈为催化剂探索了胺酯比、催化剂用量、反应压力及反应温度对NMP纯度和收率的影响，并得到了最佳工艺条件。在该条件下的实验证明工艺运行可靠稳定，生产的NMP纯度99.12%，收率95.64%，除难去除的Mg、Al含量小于2 ppb外，其他金属离子小于0.1 ppb，接近G4级，稍加处理就能满足半导体行业的要求。同时，减少一甲胺水溶液的运费。This study investigates a one-step process for producing high-purity N-methylpyrrolidone (NMP) using pure methylamine as the raw material. Exploration of amine ester ratio using self-developed modified molecular sieve rare earth cerium as catalyst in the experiment, catalyst dosage, reaction pressure, and temperature on the purity and yield of NMP. Under these conditions, experiments have shown that the process runs reliably and stably, producing NMP with a purity of 99.12% and a yield of 95.64%. Except for Mg and Al, which are difficult to remove and have a content of less than 2 pppb, other metal ions are less than 0.1 ppb, approaching G4 level. With a little treatment, it can meet the requirements of the semiconductor industry. At the same time, reduce the shipping cost of methylamine aqueous solution.