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提出以环氧乙烷和氨水为原料,利用管式反应器耦合反应精馏塔合成乙醇胺的过程强化新工艺。该工艺以90%浓度氨水为原料,首先在3 MPa,323～343 K,氨水与环氧乙烷配比为10:1的条件下,在管式反应器合成乙醇胺混合产品;混合产品经过减压和蒸出过量的氨后,进入反应精馏塔,和另一股环氧乙烷在塔内同时进行化学反应和产物分离。利用Aspen Plus软件对工艺的可行性和经济性进行了模拟分析,得到合理的流程方案和适宜的工艺参数,其中反应精馏塔适宜的工艺参数为:操作压力0.05 MPa,分离级数10,环氧乙烷和乙醇胺混合产物进料摩尔比1:1,再沸比8,模拟还得到塔内温度和浓度分布。研究表明,在此条件下,环氧乙烷和一乙醇胺在反应精馏塔内转化完全,少量水同时作为催化剂和载热剂从塔顶采出,二乙醇胺和三乙醇胺重组分通过精馏作用由塔底采出。研究表明,本文工艺能使二乙醇胺的选择性达75%以上,同时反应热能得到直接利用,其技术和经济优越性优于现有工艺。
Proposed ethylene oxide and ammonia as raw materials, the use of tubular reactor coupled reaction distillation tower synthesis of ethanolamine strengthening process. The process uses 90% ammonia water as raw material, firstly synthesizing ethanolamine mixed product in a tubular reactor under the conditions of 3 MPa, 323 to 343 K and ratio of ammonia to ethylene oxide of 10: 1; after the mixed product is reduced After the pressure and the excess ammonia are distilled off, the reaction distillation column is entered, and the other ethylene oxide is simultaneously subjected to chemical reaction and product separation in the column. Aspen Plus software was used to simulate the feasibility and economy of the process, and a reasonable process scheme and suitable process parameters were obtained. The optimum process parameters of the reactive distillation column were as follows: operating pressure 0.05 MPa, separation stage 10, ring Ethylene oxide and ethanolamine mixed product feed molar ratio of 1: 1, reboil ratio of 8, the simulation also get the tower temperature and concentration distribution. The results show that at this condition, ethylene oxide and monoethanolamine are completely converted in the reactive distillation column, and a small amount of water is taken as catalyst and heat carrier at the same time from the top of the column. The heavy components of diethanolamine and triethanolamine are rectified by rectification Produced by the bottom of the tower. The research shows that the process of this paper can make the selectivity of diethanolamine up to 75%, and the heat of reaction can be directly used, the technical and economic superiority is better than the existing technology.