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精对苯二甲酸生产中副产物醋酸甲酯催化精馏水解研究 总被引:1,自引:1,他引:0
在间歇搅拌釜反应器中考察了不同强酸性阳离子交换树脂催化醋酸甲酯水解效果的影响,选择Amberlyst 35型阳离子交换树脂为水解催化剂.建立了催化精馏实验装置,反应段采用捆扎包装填方式,考察了塔结构、进料水酯比、回流进料比和空速对催化精馏效果的影响.结果表明,催化精馏水解合适的条件为醋酸甲酯从反应段底部进料,水从反应段顶部进料,反应段6块理论板,提馏段5块理论板,空速0.36 h-1,进料水酯物质的量比5,回流进料体积比3,醋酸甲酯的水解率可以达到61.6%.使用Aspen Plus软件对醋酸甲酯催化精馏水解过程进行模拟,模拟值和实验值吻合较好. 相似文献
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醋酸甲酯水解的反应动力学 总被引:1,自引:1,他引:1
针对醋酸甲酯水解悬浮催化蒸馏工艺的要求,对杂多酸铵盐用作醋酸甲酯水解反应催化剂的反应动力学做了研究。研究表明,磷钨酸铵催化醋酸甲酯水解反应为二级可逆反应,采用拟均相模型回归了该水解反应的动力学方程,求得其活化能为E+=52.02 kJ·mol-1,E-=44.7 kJ·mol-1。使用磷钨酸铵在100 ℃下醋酸甲酯水解正反应速率常数k+=12.84 L2·(mol·min·g)-1,明显高于现有工业催化剂强酸性阳离子交换树脂在其最高使用温度下的速率常数值6.453 L2·(mol·min·g)-1,有望开发成为悬浮催化蒸馏醋酸甲酯水解催化剂良好前景,为以后的工业试验提供了依据。 相似文献
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本文建立了带侧线采出的醋酸甲酯催化精馏水解新工艺,通过实验研究了进料中水酯摩尔比、回流进料体积比、空速等对醋酸甲酯水解率的影响。与不带侧线采出的催化精馏工艺进行了比较,在同样工艺条件回流比较大情况下,带侧采的催化精馏水解工艺醋酸甲酯水解率明显提高。 相似文献
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用离子交换树脂催化水解醋酸甲酯的反应动力学研究 总被引:17,自引:0,他引:17
研究了在常压下、温度为308~328K的范围内,用阳离子交换树脂作催化剂的醋酸甲酯催化水解宏观反应动力学。建立了实验条件下的动力学模型。研究了反应温度、催化剂浓度、水酯比、催化剂装填方式及进料中含甲醇等因素对催化水解的影响。实验数据采用拟均相二级反应动力学模型进行回归,得出醋酸甲酯催化水解的正逆反应活化能为35.5和29.5kJ/mol。与催化剂浓度关联的最终速率表达式为:k+=(5.39279×10-10C-2.072059×10-8)exp(-4.270/T)k-=(5.91066×10-10C-1.51543×10-8)exp(-3.428/T) 相似文献
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本文利用已有的热力学、水解反应动力学模型以及现有催化填料的基础数据,提出了醋酸甲酯水解工艺新流程,采用催化精馏塔代替老工艺中的固定床水解反应器,分析新工艺中各塔的进料位置、回流比等灵敏度参数确定了新工艺的优化操作参数。通过全流程模拟优化,得到了各塔较佳的操作参数,在优化操作条件下醋酸甲酯总水解率达到100%,甲醇和醋酸质量浓度分别为99.97%与95.00%,为醋酸甲酯催化精馏水解新工艺的工业应用提供了基础数据。 相似文献
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经过醋酸甲酯水解过程分析,得出利用催化反应精馏方法水解醋酸甲酯是可行的.应用分段组合方法,解决了催化反应精馏过程催化剂装填问题,以及反应与精馏的整合匹配问题,并实现了工业规模应用.工业应用表明:用反应精馏水解醋酸甲酯是成功的,具有醋酸甲酯水解率高(60%~75%)、液体循环量小、蒸汽消耗低、循环冷却水用量小等优点. 相似文献
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经过分析醋酸甲酯水解过程,可知利用催化反应精馏方法水解醋酸甲酯是可行的.应用分段组合方法,解决了催化反应精馏过程催化剂装填问题,以及反应与精馏的整合匹配问题,并实现了工业规模应用.工业应用表明用反应精馏水解醋酸甲酯是成功的,具有醋酸甲酯水解率高(达到60%~75%),液体循环量小,蒸汽消耗低,循环冷却水用量小等优点. 相似文献
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催化反应精馏与醋酸甲酯的水解 总被引:2,自引:0,他引:2
通过对醋酸甲酯水解过程分析,得出利用催化反应精馏方法水解醋酸甲酯是可行的,应用分段组合方法,解决了催化反应精馏过程催化剂装填问题,以及反应与精馏的整合匹配问题,并实现了工业化应用,工业应用表明用反应精馏水解醋酸甲酯是成功的,具有醋酸甲酯水解率高(达到65%-75%),液体循环量小,蒸汽消耗低。循环冷却水用量小等优点。 相似文献
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树脂环催化剂在乙酸甲酯催化水解精馏中的应用 总被引:7,自引:0,他引:7
用压制的离子交换树脂环催化剂在催化精馏塔中进行了乙酸甲酯水解的实验研究,获得了水解转化率及沿塔高浓度分布的稳态结果。采用基于传递理论的非平衡级模型对催化水解精馏过程进行模拟,得到了与实测数据吻合妨好的模拟结果。并与前期工作以均相阳离子交换膜为催化剂所得的测定结果进行了对比,考察了新型催化剂填料-树脂压制环的优越性。 相似文献
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用催化精馏技术水解乙酸甲酯的实验研究 总被引:8,自引:1,他引:8
用填料催化反应精馏塔对乙酸甲酯的水解过程进行了系统的研究,测定了不同条件下的水解转化率数据及沿塔各组分的浓度分布。与传统的固定床反应器的极限转化率相比,其水解转化率有了大幅度的提高。对所测数据的分析表明,进料组成中是否含有甲醇不影响催化精馏水解过程。 相似文献
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This work deals with the mathematic models and improvement of four kinds of gas-liquid and gas-liquid-solid reactors for producing cumene by catalytic reaction, i.e., fixed-bed reactor, fixed-bed catalytic distillation (FCD) column, suspension catalytic distillation (SCD) column and ionic-liquid catalytic distillation (ICD) column. The fixed-bed reactor was improved by changing the particle diameter of catalyst and no extra equipment was needed. The FCD and SCD columns were, respectively, improved by carrying out alkylation and transalkylation simultaneously in a column, which also may hold for the ICD column, in which, however, the conductor-like screening model for real solvents (COSMO-RS) was used to take into account the influence of ionic liquid on vapor-liquid equilibrium (VLE). 相似文献
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Xin Gao Xingang Li Hong Li 《Chemical Engineering and Processing: Process Intensification》2010,49(12):1267-1276
An equilibrium stage model was developed for the simulation of the catalytic distillation process of methyl acetate (MeOAc) hydrolysis. In the model, the influences of the reactive kinetics, residence-time, liquid holdup, and separation efficiency of the catalytic packing were considered. The model predicted the conversion of MeOAc and the mass ratio of acetic acid to water in the hydrolysis mixture. The predictions were in good agreement with experimental data. A novel process was designed based on the results of theoretic analysis and the simulation research. This new process had a higher conversion of MeOAc compared with the results in previous research and was found to be energy efficient. Optimal effect parameters and design factors of new technology on energy consumption and conversion were also determined and summarized as the following: the position of side draw is 18th to 19th stages, the catalytic distillation (CD) column pressure is at 350 kPa, the volume ratio of reflux to feed is 6–8, mole ratio of feed water to MeOAc is 3.5–4.5, and the mass ratio of side withdrawal to feed is 0.32–0.34. 相似文献
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浆料催化精馏合成碳酸二甲酯的模拟研究 总被引:2,自引:0,他引:2
以浆料催化精馏酯交换合成碳酸二甲酯实验为基础,应用Aspen Plus软件建立了浆料催化精馏合成过程的稳态模型并进行研究。研究结果表明,模型的计算值与实验值吻合良好。通过计算机模拟还得到了实验难以测定的塔内温度分布、塔内气液相流率及组成和碳酸二甲酯在各板的生成速率的变化规律。 相似文献
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Reactive distillation with KATAPAK 总被引:5,自引:0,他引:5
KATAPAK-SP and -S are structured catalytic packings for reactive distillation or gas–liquid reactors available from laboratory to industrial scale. Applying the KATAPAK-SP concept, the ratio of catalyst volume fraction to separation efficiency can be varied over a wide range, therefore the design of a reactive distillation column can be further optimized to fit each reaction system best.
Pressure drop, separation efficiency, dynamic liquid hold-up and residence time distribution have been investigated for KATAPAK-SP in a diameter of 250 mm. Results for different gas and liquid loads are presented. The findings are compared with results for the structured laboratory scale packing KATAPAK-S and the industrial scale packing KATAPAK-S 170.Y.
The dehydration of tert-butyl alcohol was selected as a sample reaction to illustrate the influence of different catalytic structures on the performance of the reactive distillation column. The setups are compared with respect to dimensions and economics. 相似文献