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碳酸二甲酯是一种用途广泛的环境友好型有机合成中间体,利用CO2和甲醇和合成碳酸二甲酯符合现在可持续发展和绿色无污染化工的主题。综述了催化合成碳酸二甲酯的两大催化体系,均相催化剂和非均相催化剂,着重介绍了所应用的催化剂及其催化机理研究进展,对催化剂活性和选择性的影响进行了评述。 相似文献
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通过对原料进行改革,以低毒、无毒物质代替剧毒、污染环境严重的原料。碳酸二甲酯作为一种重要的绿色化工原料,环保性能优异,其合成技术的研究备受关注。本文简要介绍了碳酸二甲酯的4种合成方法:酯交换法、甲醇氧化羰基化法、尿素醇解法和二氧化碳和甲醇直接合成法,并总结了碳酸二甲酯的部分应用,为碳酸二甲酯的生产和下游产品开发及应用提供一些参考。 相似文献
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碳酸二甲酯合成技术与经济分析 总被引:1,自引:0,他引:1
本文介绍了碳酸二甲酯的性质、应用领域和生产消费情况,从工艺特点、催化剂等方面介绍了4种合成路线,并对其技术经济性做了简要对比分析,指出目前较好的合成路线为尿素甲醇法,存在的问题是高效催化剂的开发。将尿素甲醇法和二氧化碳甲醇直接合成法进行了对比,认为这两种方法是碳酸二甲酯合成技术的未来发展方向。 相似文献
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碳酸二甲酯合成研究新进展 总被引:2,自引:0,他引:2
碳酸二甲酯的合成研究受到了国内外研究者的广泛关注,合成路线正朝着简单化、无毒化和无污染化的方向发展。综述了国内外CO2和甲醇直接合成法、酯交换法和尿素醇解法合成碳酸二甲酯的研究进展,在均相催化体系、非均相催化体系、离子液体催化体系、超临界反应体系以及光催化反应体系下概述了上述方法的研究概况。由于上述方法合成碳酸二甲酯存在催化剂活性或选择性不高,产率低等缺点,今后寻找更加合适的催化剂及载体、提高催化剂的活性和选择性将成为研究重点。 相似文献
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针对酯交换制备过程中甲醇?碳酸二甲酯共沸体系难分离的问题,分别选择变压精馏、碳酸乙烯酯(EC)萃取精馏与乙二醇(EG)萃取精馏3种分离过程进行模拟与能量集成,对比了3种工艺流程的分离能耗,采用有效能(?)分析方法分析了能耗最低的变压分离过程的有效能(?)损失. 结果表明,3种工艺流程的能耗EG萃取精馏>EC萃取精馏>变压精馏,碳酸二甲酯生产过程中内部循环物流能量是输入总能量的1.55倍,变压共沸分离过程的?损失为7.9%。 相似文献
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Feng Wang Yanfeng Pu Jinhai Yang Taiying Wang Languang Chen Ning Zhao Fukui Xiao 《中国化学工程学报》2019,27(8):1879-1887
Much attention has been paid for the synthesis of dimethyl carbonate(DMC) by urea indirect alcoholysis method, which had not been actually industrialized by now. The rigorous full process model was then necessary to optimize the process with heat integration. In this paper, a full process was designed and optimized for the DMC synthesis by urea indirect alcoholysis method based on Aspen Plus software.The technological analysis was developed to find how the process was influenced by the three main recycled materials of methanol, 1,2-propylene glycol(PG) and mixture of DMC–methanol. Simultaneously,the thermal optimization was taken into account for energy saving and the optimized process was proposed with heat integration. Moreover, the economic evaluation was implemented for the optimized process with total annualized cost(TAC) and cost of product(COP) according to the plant investment and operations. It was found that the 11.6% decrease in TAC was obtained for the optimized process compared to the original designed process. The COP analysis showed that the process was economically efficient for the production of DMC from urea and methanol. 相似文献
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DMC (Dynamic Matrix Control) has been used successfully in industry for the last decade. It can deal with constraints and
unusual dynamic behavior directly. It also shows a good control performance for the servo problem. Relatively, it can’t reject
disturbances systematically. We propose a modified DMC method to control the regulatory process more efficiently. The proposed
DMC method makes the control output by subtracting the estimated disturbance from the control output of the original DMC.
Here, the disturbance is estimated by a new disturbance estimator. It shows better control performances than the original
DMC. 相似文献
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对碳酸二甲酯(DMC)的合成方法的研究现状进行了阐述,主要包括三种合成方法,分别是酯交换法、甲醇氧化羰基化法以及CO_2和甲醇直接合成法,对这些合成途径的相关研究现状进行了阐述,并提出了碳酸二甲酯未来的发展方向。 相似文献
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近年来,NHD脱硫、脱碳技术已得到广泛应用,不仅应用于合成氨原料气的脱硫、脱碳,并在其它领域扩展,如甲醇生产过程中原料气的脱硫、脱碳;醋酸低压羰基合成制CO的脱硫、脱碳;硫回收尾气的脱硫处理等。由于制气原料、制气方法及预处理工艺的不同,其COS含量也不相同,甲醇合成反应要求将合成气中总硫脱除达到0.1×10-6以下,以保护催化剂,一般通过干法脱硫工艺来实现,在NHD脱碳的同时也脱除掉大部分COS,结合实际问题,为合理设计精脱硫工艺装置提供依据。 相似文献
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An in situ Raman study of dimethyl carbonate synthesis from carbon dioxide and methanol over zirconia 总被引:3,自引:0,他引:3
In situ Raman spectroscopy has been used to investigate the mechanism of dimethyl carbonate (DMC) synthesis via the reaction of methanol with carbon dioxide over zirconia. Methanol adsorption leads to the appearance of adsorbed methoxide groups, whereas CO2 adsorption leads to the formation of carbonate species. Monomethyl carbonate species, (CH3O)COO(Zr)2, are formed by the reaction of methoxide and monodentate carbonate species and DMC is formed via the further reaction of monomethyl carbonate species with methanol. This sequence is supported by evidence that DMC decomposition on zirconia proceeds via the reverse of the proposed mechanism. 相似文献