共查询到18条相似文献,搜索用时 93 毫秒
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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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Polycarbonate is prepared by the interfacial phosgenation and polycondensation of bisphenol A (BPA) in methylene chloride with caustic using triethylamine as a catalyst. In a typical batch reactor, where phosgenation and oligomerization proceed simultaneously, the critical process parameters are intermingled and are difficult to determine. Therefore, a semicontinuous process consisting of a series of static mixers for continuous phosgenation, followed by a batch reactor for oligomerization and polycondensation, was developed for better understanding of the reaction mechanisms. Phosgene hydrolysis was reduced greatly going from a batch to a continuous reactor (excess phosgene was reduced from 30 to 5%). Variables which influence the composition of intermediates are linear velocity, organic to aqueous volume ratio, PH (BPA to NaOH ratio), and phosgene to BPA ratio. These variables also affect BPA conversion, amount of phosgene hydrolysis, terminator capping efficiency, molecular weight, and molecular weight distribution of the resulted polycarbonate. Oligomerization takes place at the interface, and monochloroformates (HO-Bn-OCOCI) which contain both hydrophilic and lipophilic end groups, stay at the interface and, hence, react preferentially. Oligomers are analyzed by a newly developed HPLC technique. 相似文献
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对三光气法合成苯磺隆工艺进行了改进。通过对催化剂、三光气(BTC)用量及加料方式、温度4个因素的考察,结果表明:BTC用量远高于理论量值主要是由于BTC在高温下快速分解。由此,将原利用单级反应瓶的合成工艺改为两级串联合成工艺,把第一级反应瓶逸出的光气通入第二级反应瓶进行反应,使过量的光气得到了有效的利用。在n(邻甲酸甲酯苯磺酰胺)∶n(催化剂)=1∶1,2个反应瓶内邻甲酸甲酯苯磺酰胺等量,第一级反应瓶温度由110℃升至120℃,第二级反应瓶温度控制在130±5℃的工艺条件下,BTC耗量由原来理论量的253%降低至148%,收率由84.8%提高至91.0%。 相似文献
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依据实际运行结果,通过对各种密封性能的对比,肯定了机械密封在光气酯化反应釜上应用的优越性能。剖析了在使用过程中出现问题的原因,并提出相应的改进措施。 相似文献
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The presented work evaluates the implementation of adsorption and desorption experiments with Cl2 over carbon materials towards the development of more active and stable catalysts for industrial phosgene synthesis. By using a soft templating method as a tool, ordered mesoporous carbon materials with tunable porosity, surface area, and degree of graphitization were synthesized and utilized as model system. The Cl2 adsorption/desorption properties of these materials were studied and compared to commercial activated carbon. To draw correlations between Cl2 adsorption/desorption behavior and catalytic performance, the materials were further tested in the phosgene formation in a plug flow reactor. However, the chemical reaction of Cl2 with carbon during the adsorption/desorption experiment hinders a direct correlation. 相似文献
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