共查询到18条相似文献,搜索用时 125 毫秒
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简述了乙烯 -醋酸加成制取醋酸乙酯新工艺原理和流程 ;并同醋酸 -乙醇酯化和乙醛缩合制醋酸乙酯生产工艺作比较 ,阐明了新工艺是醋酸乙酯生产中技术先进、经济效益高的生产方法。 相似文献
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针对增塑剂生产中回收醇使用时出现的酯化反应“冲料”、延长酯化时间、影响产品质量等现象。研究了回收醇净化工艺技术在增塑剂酯化工段中的应用。该项技术的应用,明显提高了生产产量及生产效率,还降低了原料消耗,产品质量不仅得到提高还能保持稳定。 相似文献
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以改性天然丝光沸石为催化剂对乙酸与乙醇酯化的研究 总被引:1,自引:0,他引:1
一、前言醋酸乙酯传统的合成方法是以无机酸为催化剂的液相均相酯化法,存在着严重的腐蚀和污染。为克服上述缺点,许多人进行了以离子交换树脂和固体酸等为催化剂的液相非均相酯化法的研究。目前,采用在热力学上占优势的气相非均相酯化法, 相似文献
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醋酸乙酯的生产技术主要包括醋酸酯化法、乙醛缩合法、乙烯加成法、乙醇脱氢法等,并且随着研究的深入和技术的攻关,其生产技术不断取得进展,具体表现在乙醇一步法合成醋酸乙酯工艺及催化剂开发、乙醇脱氢中的催化剂开发、醋酸乙酯中杂质分离技术改进、联产技术等方面。此外,醋酸乙酯在国内国外都有着广大的市场,为了促进中国醋酸乙酯行业的发展,还需要根据具体情况采取相应的措施。 相似文献
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《精细化工原料及中间体》2017,(5)
正本发明涉及醋酸间接加氢法单产或联产乙醇和醋酸乙酯的工艺,首先将醋酸与乙醇置于酯化塔中,在酸催化剂的作用下进行反应精馏,得到醋酸乙酯和水,上述混合物经塔顶镏出,冷凝后进分水器、精馏脱轻塔以及精馏脱重塔,以脱除杂质,最后得到合格的醋酸乙酯产物,该产物部分作为产品出售,部分作为氢解反应生产乙醇的原料导入氢解塔中进行催 相似文献
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Coproduction of Ethyl Acetate and n‐Butyl Acetate by Using a Reactive Dividing‐Wall Column
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The performance of the reactive distillation dividing‐wall column for coproduction of ethyl acetate and butyl acetate was experimentally studied. n‐Butanol and ethanol are raw reaction materials that react with acetic acid in the reaction zone to produce n‐butyl acetate and ethyl acetate, respectively. n‐Butyl acetate is not only a product, but also acts to remove water generated by the esterification reactions. The effects of various parameters, such as catalyst loading per stage, reflux ratio, liquid split and molar feed ratios, ethyl acetate/n‐butyl acetate purity, pressure drop, and total energy consumption, are investigated. Results show that ethanol could be completely converted and the products could be easily separated, which shows great industrial application potential in the coproduction of ethyl acetate and n‐butyl acetate. 相似文献
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The uncatalyzed esterification of acetic acid is described in the literature as a typical example of reactive distillation. Many rigorous models were validated using this esterification as an example. Process proposals for the production of pure ethyl acetate from ethanol and acetic acid have been determined using short-cut methods with the assumption of chemical equilibrium only. In this publication, the limitations of this esterification are clarified, using a rigorous model that was developed. The reasons why reactive distillation appears to be unfavorable for this esterification are explained. It is, however, theoretically possible to obtain ethyl acetate in high purity with different variants of the process. Different process variants are examined in this work. Construction variables that are important for the design of reactive columns, such as the number of reactive separation stages and the holdup in the column, are analyzed. Furthermore, the influence of variables dependent on the component system, such as the phase equilibrium of the reactive system and the reaction kinetics on the conversion in the column, are described. It can be shown that the short-cut methods published so far for reactive distillation, which assume chemical equilibrium, are inadequate. 相似文献
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硅胶固定化咪唑酸性离子液体的合成及在酯化反应中的应用 总被引:2,自引:1,他引:1
为了减少离子液体用量,缩短反应时间,提高酯化反应的催化效率,该文以硅胶为原料与-γ(2,3-环氧丙氧基)丙基三甲氧基硅烷(KH-560)反应,合成了环氧基硅烷化硅胶,再与1-甲基咪唑硫酸氢盐发生开环反应,制备了一种硅胶固定化1-甲基咪唑硫酸氢盐离子液体。探讨了该离子液体在无机酸促进下对合成乙酸乙酯反应中原料摩尔比、酸的用量及离子液体用量等因素对反应的影响。实验表明,当n(乙醇)∶n(乙酸)=1.5∶1,该固定化离子液体用量为1.00 g,盐酸用量为2.0 mL时,乙酸乙酯的最高产率可达90.0%。固定化离子液体重复使用5次,酯的产率由90.0%降至85.1%。将该固定化离子液体应用于催化乙酸异戊酯、苯甲酸乙酯、草酸二乙酯、乙酸正丁酯和马来酸二乙酯的合成,酯的产率比仅用盐酸单组分催化分别提高了20.4%、25.6%、28.2%、22.3%和16.1%。通过简单滤除就可实现离子液体与产物的分离。 相似文献
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High surface area zirconium phosphate in an amorphous phase exhibits high activities for water-related reactions such as hydrolysis of ethyl acetate and esterification of acetic acid with ethanol. The zirconium phosphate is insoluble during the reaction, is recoverable by simple filtration, and can be reused at least five times without any treatment. 相似文献
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乙酸乙酯作为基础化工原料受到国际市场的波动影响较大,这几年我国的进口呈现负增长态势,而出口正增长则逐渐增大。而在加强环保和改革的形式下,传统的酯化法已经不能适用我国,对于已经实现工业化的乙醛缩合法是值得我国企业转型考量的方向。 相似文献
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针对乙酸酯化法生产乙酸乙酯分离过程复杂、能耗大的缺点,提出了一种带侧线反应精馏-渗透汽化(RD-PV)集成过程。通过反应精馏塔侧线采出和渗透汽化膜组件及时移出水分,促进酯化反应向正反应方向进行,在达到乙酸高转化率的同时使乙酸乙酯产品达到高纯度。研究了反应精馏塔侧线采出位置、采出比、反应段塔板数、精馏段塔板数以及膜组件个数等对年度总成本(TAC)的影响,获得了TAC达到最小的过程参数。与传统双塔精馏分离过程对比,RD-PV集成过程节省能耗26.6%,但膜材料价格对RD-PV集成过程的TAC有较大影响,随着渗透汽化技术的成熟,当膜材料价格低于1913 CNY·m-2时,RD-PV集成过程在经济上占据优势。 相似文献