共查询到19条相似文献,搜索用时 78 毫秒
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碳酸二甲酯(DMC)作为一种重要的低毒、环保、绿色有机化工中间体,广泛应用在农药、塑料、医药等工业领域,并在锂电池、汽车工业领域受到广泛的关注。针对当前碳酸二甲酯合成工艺的发展现状进行了阐述,重点介绍了酯交换法、甲醇氧化羰基化法以及尿酸醇解法,并对这三种合成工艺路线的技术及产能现状进行了综述。 相似文献
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碳酸二甲酯是近年来颇受重视的一种被广泛应用的基本有机合成原料,应用领域广泛.目前工业化生产方法有光气法、甲醇氧化羰基化法、酯交换法等,目前酯交换法是国内主流工艺,但未来尿素醇解法等新技术将会得到快速的发展. 相似文献
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尿素直接醇解法合成碳酸二甲酯催化剂研究进展 总被引:5,自引:0,他引:5
综述了甲醇与尿素醇解法催化合成碳酸二甲酯所用催化剂的研究进展,尿素醇解法合成碳酸二甲酯具有原料价廉易得、工艺简单、操作条件温和、反应过程无水生成和反应产生的氨气可以回收利用等优点,具有工业化前景。 相似文献
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碳酸二甲酯(DMC)是一种重要的绿色有机合成中间体。在合成DMC的方法中,甲醇氧化羰基化法对设备腐蚀小、原料易得、产物易分离,有着诱人的工业化前景。文中介绍了该反应中所使用的Co、Pd、Cu和Au这4类催化剂的结构特点和催化性能,比较了不同催化剂在氧化羰基化中的催化效果。为了进一步提高催化剂的活性、选择性、减少其腐蚀性,开发出性能更好的工业催化剂,可以通过研究催化反应机理,并通过添加助剂和载体来实现。其中无卤铜系催化剂是今后羰基化合成DMC的重要研究方向。 相似文献
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碳酸二甲酯的合成化学 总被引:1,自引:0,他引:1
碳酸二甲酯是重要的的机化工原料之一,有着有机合成的新基石和绿色化工产品之美称,是新的燃油添加剂,在21世纪将具有广阔的应用前景。论述了碳酸二甲酯的合成化学,特别是目前工业化非光气甲醇氧化羰基化制备碳酸二甲酯的化学过程,并给出了可能合成碳酸二甲酯的其他化学路线。 相似文献
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甲醇氧化羰基化是合成碳酸二甲酯的重要方法,也是重要的煤炭清洁利用途径之一,近年来获得较大发展。本文详细阐述了该工艺过程中有关催化剂的国内外研究现状及发展趋势,并根据载体的结构特征,按照分子筛载体、活性炭载体和其它载体,将铜基催化剂分为三类,综合论述了合成催化剂的制备技术,表面微观结构和特征、催化性能以及催化机理等方面的最新研究进展。通过深入分析和比较,认为分子筛和活性炭为载体制备的负载无氯铜基催化剂,不仅具有较好的催化活性和稳定性,而且避免了以前CuCl/CuCl2为活性组分催化剂中Cl离子对催化剂活性和稳定性的影响,以及对设备造成的腐蚀,具有较好的发展前景。 相似文献
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概述了以合成气为原料合成二甲醚工艺中浆态床反应器使用的双功能催化剂的研究现状和最新进展。介绍了传统双功能催化剂以及对传统催化剂的改性研究,重点介绍了基于使催化材料的制备环境与其使用环境完全一致,以解决催化剂失活问题的完全液相法的研究进展,该方法制备的催化剂具有良好的稳定性和催化性能,并具有广泛的应用前景。 相似文献
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Dimethyl carbonate is an environmentally benign and biodegradable chemical. Based on integration of reactive distillation and pressure-swing distillation technologies, a novel process for synthesis of dimethyl carbonate through transesterification with propylene carbonate and methanol has been developed by Huang et al. In this work, the optimization of this process was performed by minimizing the total TAC. The results show that the op-timal design flowsheet can save energy consumption by 18.6%with the propylene carbonate conversion of 99.9%. Then, an effective plant-wide control structure for the process was developed. Dynamic simulation results dem-onstrate that the temperature/flow rate cascade control plus with simple temperature control can keep not only product purity but also the conversion of the reactant at their desired values in the face of the disturbance in re-actant feed flow rate and feed composition. 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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A novel method simultaneously to prepare dimethyl carbonate and ethylene glycol dimethacrylate from ethylene carbonate and methyl methacrylate has been demonstrated in the presence of catalyst sodium methoxide and polymerization inhibitor ZJ-705. The effect of reaction parameters such as catalyst loading, polymerization inhibitor loading, concentration of reactants, reaction time, etc., on synthesis of dimethyl carbonate and ethylene glycol dimethacrylate was investigated. A reaction mechanism has been discussed with catalyst sodium methoxide. 相似文献
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CaO–ZrO2 catalysts were prepared by coprecipitation and their catalytic performances were evaluated in the synthesis of dimethyl carbonate from propylene carbonate and methanol. The characterization by XRD, N2 adsorption, XPS and CO2–TPD indicated that Ca2+ ion substituted for Zr4+ ions in the host lattice to form homogeneous CaO–ZrO2 solid solution when Ca/(Ca + Zr) ratio changed from 0.1 to 0.3, and CaO segregated at grain boundaries with Ca/(Ca + Zr) ratio from 0.4 to 0.5. As a result, the catalysts showed different activity and stability towards the transesterification of propylene carbonate and methanol into dimethyl carbonate. The activity of catalysts was improved with increase in Ca content, whereas high stability was shown with Ca/(Ca + Zr) ratio below 0.3. The formation of homogeneous CaO–ZrO2 solid solution was responsible for the stability of catalysts. 相似文献