共查询到19条相似文献,搜索用时 78 毫秒
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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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醋酸甲酯催化反应精馏水解工业化应用 总被引:1,自引:0,他引:1
利用催化反应精馏的原理,对醋酸甲酯反应精馏水解过程的研究进行了工业化规模应用。工业应用表明用反应精馏水解醋酸甲酯是成功的,不仅醋酸甲酯水解转化率大幅度提高,而且引起回收工段的工艺更新。新的回收工艺过程具有醋酸甲酯分解率高,液体循环量小,蒸汽消耗低、循环水用量小等优点。 相似文献
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醋酸甲酯催化精馏水解技术的工业应用 总被引:1,自引:0,他引:1
醋酸甲醇精馏水解工艺在水酯比=2.0,回流进料=1.8-2.53,空速=0.43的范围内,酯的分解率大于57%,水解产物中酸水比大于1.3。与传统的固定床水解工艺相比具有明显优势。 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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催化反应精馏与回收工段工艺的改进 总被引:1,自引:0,他引:1
采用催化反应精馏方法水解醋酸甲酯,提高水解率达70%~80%,该法的应用引发了回收工段工艺的改进,为优化工艺、节能降耗提供了基础条件。 相似文献
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反应精馏水解醋酸甲酯工业化应用总结 总被引:2,自引:0,他引:2
通过对反应精馏水解醋酸甲酯过程的研究,在中试基础上进行了工业性规模应用。工业应用表明反应精馏水解醋酸甲酯是成功的,不仅醋酸甲酯水解转化率大幅度提高,而且引起回收工段的工艺更新。新的回收工艺过程具有醋酸甲酯分解率高、液体循环量小、蒸汽消耗低、循环水用量小等优点。 相似文献
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乙酸甲酯催化精馏水解工艺研究 总被引:10,自引:0,他引:10
采用阳离子交换树脂为催化剂 ,研究了乙酸甲酯催化精馏水解工艺。反应区充填离子交换树脂催化剂捆束包 ,提馏段充填Mo Ti金属板波纹丝网填料。在小试、中试 (塔径为 2 0 0mm)和工业化 (塔径为1 0 0 0mm)实验中 ,系统地研究了水酯摩尔比、回流进料比和空速对酯分解率和分解液中酸水质量比的影响 ,获得不改变现有聚乙烯醇生产中乙酸甲酯分解回收工艺流程的最佳分解率为 50 %— 60 % ,由此导致比原工艺节能约 30 %和原有设备利用率成倍提高 相似文献
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王成习 《中国化学工程学报》2001,9(4):382-387
A nonequilibrium stage model was used to simulate countercurrent multicomponent catalytic distillation processes for methyl acetate hydrolysis. Computations of stage eiliciencies or height equivalent to a theoretical plate (HETP) were entirely avoided by this model. The consistency of simulated results and experimental data in conversions and concentration of each component along a column indicates that the model predicts the actual process well. The influences of operating parameters on hydrolytic conversions, such as feed molar ratios, feed locations, feed and reflux rates, heights of reactive and stripping sections, were analyzed adequately by simulating calcuiations. A good operating mode was then obtained, which is helpful to the development of a new process. 相似文献
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王成习 《中国化学工程学报》2001,(4)
A nonequilibrium stage model was used to simulate countercurrent multicomponent catalytic distillation processes for methyl acetate hydrolysis. Computations of stage efficiencies or height equivalent to a theoretical plate (HETP) were entirely avoided by this model. The consistency of simulated results and experimental data in conversions and concentration of each component along a column indicates that the model predicts the actual process well. The influences of operating parameters on hydrolytic conversions, such as feed molar ratios, feed locations, feed and reflux rates, heights of reactive and stripping sections, were analyzed adequately by simulating calculations. A good operating mode was then obtained, which is helpful to the development of a new process. 相似文献
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A process composed of a fixed-bed and a distillation column with a side withdraw, mainly methanol, is developed to hydrolyze methyl acetate (MA) as a typical byproduct in polyvinyl alcohol (PVA) and pure terephthalic acid (PTA) factory. The process is simulated by employing the equilibrium stage model RadFrac and plug flow model Rplug in Aspen Plus. Experiments are also carried out in a lab-scale to evaluate the process. The results show that at the molar ratio of water to methyl acetate about 4.0-5.0 in the feed stream and the volume ratio of distillate to feed MA above a critical value, the side product contains more than 80% (by mass) (MeOH) and less than 2% (by mass) MA, while the bottom contains more than 46% (by mass) acetic acid (HAc) and less than 0.5% (by mass) methanol with almost complete conversion of MA. Compared with the old catalytic distillation process we proposed before, this process can cut down 47.6% energy consumption and a distillation column. 相似文献
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In this paper, the feasibility of applying catalytic distillation for the hydrolysis of methyl acetate is studied experimentally. An optimum technological process for the hydrolysis is determined, based on experimental results and mathematical simulations. The methyl acetate conversion can be greatly increased, and the energy consumption reduced, for certain operation conditions via the catalytic distillation process. 相似文献
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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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催化剂填料催化乙酸甲酯水解的动力学研究 总被引:2,自引:0,他引:2
王成习 《高校化学工程学报》2004,18(4):442-446
采用间歇搅拌釜反应器在40~55的温度范围内以强酸性催化剂填料为催化剂研究了乙酸甲酯的水解动力学规律。实验在原料水与乙酸甲酯的摩尔配比0.5:1~2:1范围内考察了低水浓度时的动力学结果,并采用了较小的粉状催化剂颗粒和较高的搅拌速度以消除内外扩散阻力。实验结果分别用均相动力学模型和基于Langmuir- Hinshelwood 理论的非均相动力学模型进行拟合,得到了两者的模型参数。统计检验发现在水浓度不太高的条件下基于单点吸附理论的表面反应是最关键的控制步骤,此时用非均相动力学方程来拟合实验数据比较准确,而传统上采用的均相动力学方程拟合精度较差,只有在水浓度很高的条件下才能适用。 相似文献