催化蒸馏制备叔丁醇工艺及模拟

Process and the Related Simulation Research for Synthesis of tert-Butanol with Catalytic Distillation

以碳四馏分和去离子水为原料，耐高温大孔磺酸阳离子交换树脂为催化剂，采用催化蒸馏新工艺考察了反应压力、碳四质量空速、水与碳四物质的量之比和反应温度对异丁烯水合反应的影响。结果表明，在反应温度为79℃，反应压力为1．0MPa，碳四质量空速为O.3h^-1，水与碳四物质的量之比为5：1，塔顶进水量与中部进水量的比为5：2的最优反应条件下，异丁烯转化率和叔丁醇的选择性分别达到80．07％和99．96％，高于现有异丁烯水合工艺的转化率（60％-75％）。上述催化蒸馏实验数据与利用AspenPlus软件建立的模拟工艺流程得到的尾气和釜液组成的模拟值能够较好地吻合。

The synthesis of tert-butanol from isobutene-contained C4 raffinate and deionized water was achieved over ion exchange resins with desirable macropores and thermal stability in a catalytic distillation column. Effects of reaction pressure, temperature, space velocity of the C4 raffinate(C4, mass fraction of isobutene 24.40%) and the molar ratio of H2 O to C4 on the conversion of isobutene to tert-butanol were studied. The conversion of isobutene and the selectivity of tert-butanol reached 80.07% and 99.96%, respectively, under the conditions of temperature 79 ℃, pressure 1.0 MPa, the space velocity of C4 0.3 h-1, molar ratio of H2 O to C4 5:1, and ratio of top-feeding water to middle-feeding water at 5:2. The obtained results were much better than the conversional hydration of isobutene with a conversion of 60%-75%. Besides, the components of the off-gas and residue in the bottom of reactor from experiment were consistent with the simulation results by Aspen Plus.