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Heteropoly acid used in the isobutylene catalytic hydration Preparation of tert- butanol research

Author: GuoYuFeng
Tutor: YangYanZuo
School: Shandong University
Course: Chemical Engineering
Keywords: Raffinate carbon Catalytic hydration Isobutylene Tert-butyl alcohol Heteropoly acid Kinetic equation Corrosive experiment Separation and purification
CLC: TQ223.124
Type: Master's thesis
Year: 2010
Downloads: 144
Quote: 0
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Abstract


The refinery or rubber plant mixed carbon contains large amounts of n-butene and isobutene four raffinate carbon Fourth from mixed C4 isobutylene hydration tert-butyl alcohol, isobutylene and tert-butanol applications continues to expand, has very broad prospects. Reaction conversion is low due to the presence of a catalyst for the hydration reaction, life is short, n-butene involved in the reaction, and isobutylene easy polymerization and other issues, in recent years developed a heteropoly acid catalysts. This article first comprehensive heteropolyacids preparation for isobutene catalyzed hydration mechanism of the catalytic reaction of tert-butanol amplification process involved in the process and engineering pre-industrialization content of the comprehensive study report. Heteropoly acid having the Keggin structure having a catalytic hydration activity of an anion derived from it has a structure, the heteropoly acid is used for the hydration reaction of the isobutylene having a high conversion, good selectivity, and the relaxation of the reaction conditions, etc.. Heteropoly acid catalyst was prepared under laboratory conditions with catalytic activity, industrial scale and expanded pilot test that the preparation is simple and easy to get characteristics, good repeatability and large-scale industrial applications. In the the laboratory single kettle conditions, the heteropoly acid aqueous solution using homemade the mixed C4 isobutylene catalytic hydration tert-butanol reaction influencing factors were studied, found heteropoly acid catalyst by mixing carbon of isobutene hydration of tert-butanol is a reversible reaction, in a single reactor under test conditions in detail the effects of reaction time, reaction temperature and stirring speed as well as the material in the water to oil ratio on the reaction results, and determining the isobutylene catalytic hydration system tert-butanol best reaction conditions. Examined in detail on the basis of operating conditions of isobutene hydrated designed multistage countercurrent reactor, improved reactor, under optimal reaction conditions, and the first time in the continuous reactor of the multi-stage countercurrent achieve isobutylene conversion rate indicators of ≥ 99.5%, reaching the factory setting goals. Consider the presence of hydration reaction reaction control or pass control of the two possible parametric regression method of experimental data processing model one and model of isobutylene hydration reaction, calculated by the model and experimental data comparison found that the hydration reaction thereby determining the mass transfer control the reaction kinetics of the hydration reaction of the isobutylene catalytic formula: (?) due to the complexity of the heteropoly acid-catalyzed hydration isobutene production of t-butanol reaction product component, in addition to containing t-butanol, further comprising sec-butanol, iso-butane, n-butene, isobutene and dimers, trimers, etc. the numerous C4 and other derived component, and containing a heteropoly acid catalyst to be separated and recovered, it is difficult to solve using mathematical models of tert-butanol separation refined optimization. Explore data plus optimized conditions combined with a small pilot test program found that the the: ① operating pressure changes do not affect the tert-butanol - water azeotrope composition. (2) the pressure of distillation operation must be guaranteed, the optimum operating temperature is ≤ 60 ° C under conditions of lower pressure (or higher vacuum). The condensed overhead product of the industrial cooling water at room temperature there are difficulties. ③ to reach the top of the tower separation requirements (overhead product tert-butyl alcohol content of ≥ 85%, the tower bottom product of tert-butanol content ≤ 0.5%), requires the number of theoretical plates 11, the minimum reflux ratio, suitable reflux ratio of 10, The actual number of trays 32. ④ washed balance data showed that: the system of washing residual C4, t-butanol in the average value of the distribution coefficient of water, oil phase 2. ⑤ In order to achieve the required washing effect, to ensure the remaining C4 tert-butanol is less than 200ppm, the extraction compared with R = 0.5, the required theoretical plates 9. Thus, simply by washing recycling the reaction remaining C4 larger tert-butanol process, equipment investment and cost recovery. ⑥ liquid phase the remaining residual C4 of vaporization - washing - expansion C4 gas recompression liquefaction process, very small heat of vaporization required compressed liquefied consumption of power is also smaller, more appropriate process. Material corrosion test: occurrence of a serious comprehensive dissolved corrosion of carbon steel in 50% P-Mo heteropoly acid aqueous solution. Can be a good general corrosion resistance stainless steel PMo, 2 heteropoly acid aqueous solution. Temperature ≤ 80 ℃, 304, domestic 1Cr18Ni9Ti and 316I average corrosion rate in the following 10-3mm / y. The corrosion resistance of 304 and 18-8 is basically similar, 316L best.

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CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aliphatic compounds ( acyclic compounds) > Aliphatic alcohols (alcohols, hydroxy compounds) and its derivatives > Aliphatic alcohol > Fatty Alcohols > Butanol
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