共查询到18条相似文献,搜索用时 187 毫秒
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针对光气反应器的发展完善进行了比较分析 ,并结合国内一些光气反应器换代生产经验 ,着重推介了适合我国中、小型光气生产装置的列管式双管板光气反应器 相似文献
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2011年9月2日,赛鼎公司与天津大学合作申请的发明专利套筒分布式气相光气化反应器及用于合成异氰酸酯的方法获得国家知识产权局授权。气相光气化反应器是气相法异氰酸酯生产的核心装置。鉴于气相光气化反应对活塞流流动方式的要求,该发明提出了在整个流通截面上,实现分层环状流体输入的套筒分布式反应器。 相似文献
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光气(COCl2)是一种重要的但又剧毒的化工中间体,其安全生产方法学研究具有重要的科学意义和工业价值。以FeCl3为催化剂、以四氯化碳(CCl4)与过氧化氢(H2O2)为反应原料,以微通道为反应器,以氨气和光气反应生成尿素为探针反应,实现了在微通道反应器内原位生产和利用光气。通过考察反应温度、H2O2浓度、FeCl3浓度以及进料流速对光气收率的影响,确定了反应的最佳条件(温度55.0℃,CCl4浓度0.104 mol/L,FeCl3质量分数1.0%,H2O2质量分数15.0%,总流率12.0 mL/min),在该条件下,光气的收率可达93%。本研究揭示了微通道反应器内原位合成和利用光气的可行性,为更多有机化合物的光气化提供了有益参考,而且该方法有望有效消除光气在存储、运输和使用过程中因泄露带来的潜在危险。 相似文献
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介绍了在光气合成反应过程中,存在的触媒寿命较短、光气合成反应器腐蚀严重、合成光气中余氯超标等问题,通过分析现场实际操作数据,结合光气合成反应理论,找出了产生光气合成系统问题的主要原因,并提出了相应解决办法:严格控制原料CO及氯气中的水含量、加大循环冷却热水的水量以迅速移走反应热、各个列管内催化剂装填量和密度尽量一致,经技术改造后,取得了良好效果。 相似文献
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Summary Copolymers containing -S-CO-S-and/or -O-CO-S-groups have been synthesized mainly by interfacial polycondensation.Different chemical structures were obtained by reacting 1,3-benzene dithiol (BDT) respectively with phosgene alone, phosgene and bisphenol-A (BPA), bischloroformate of BPA, BPA polycarbonate oligomers and by reacting phosgene with the products of BPA polycarbonate degraded with BDT. The chemical structures of the copolymers were investigated by IR, 1H-NMR and 13C-NMR; molecular weights were determined by viscometry and vapor pressure osmometry. Although no attempt was made to find the optimum conditions for high molecular weight, some copolymers with fairly high mol. weight were obtained. 相似文献
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一氧化碳干燥技术及应用 总被引:3,自引:0,他引:3
本文阐述了光气生产中一氧化碳冷冻脱水-分子筛吸附的干燥技术,使得干燥后一氧化碳水份含量≤100ppm,提高了光气及光气化产品的质量和设备使用寿命,保证了光气安全生产。 相似文献
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《Applied Catalysis A: General》2007,316(1):1-21
Diphenyl carbonate (DPC) is considered as a substitution for phosgene to synthesize polycarbonate resins. Conventional production of DPC involves reactions of phosgene and phenol. However, the phosgene process has drawbacks such as environmental and safety problems associated with using highly toxic phosgene as the reagent, which results in the formation of chlorine salts, and copious amounts of methylene chloride as the solvent. For these reasons, environmentally friendly processes for DPC production without using phosgene have been proposed and developed in the past decades. So far, the most promising alternatives appear to be the transesterification of dimethyl carbonate (DMC) and phenol, the direct oxidative carbonylation of phenol, and transesterification of dialkyl oxalates and phenol. This paper attempts to review recent literature concerning process design and catalytic chemistry for these phosgene-free approaches. The advantages and disadvantages are discussed for each reaction. Strategies to overcome potential problems are provided. The perspectives to improve catalytic efficiency of phosgene-free process are proposed. 相似文献