共查询到20条相似文献,搜索用时 109 毫秒
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以乙二醇与KOH的混合物作萃取剂,采用加碱萃取精馏对85%叔丁醇进行分离,得到了纯度为99.5%的叔丁醇产品。设计了工艺流程,确定了操作条件,萃取剂可用减压精馏的方法回收,回收的萃取剂循环使用不影响分离性能。实验结果表明:加碱萃取精馏也是分离叔丁醇-水恒沸体系的有效方法。 相似文献
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主要介绍了液液萃取法和精馏法回收废水中DMAC。讨论了液液萃取法中萃取剂的选择及对萃取平衡影响的因素:pH值、温度、氯化锂含量等,并讨论了多级萃取理论级数的计算和实验验证。通过对比萃取和精馏两种方法,萃取-分馏法是最好的选择。 相似文献
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萃取精馏中用脱溶剂方法计算萃取剂用量十分繁杂,计算误差大。主要原因是:萃取剂的挥发度小,用数值小的数据关联数值较大的萃取剂用量,可能产生计算误差;在计算过程中脱溶剂的数据与不脱溶剂的数据混用;脱溶剂计算方法没有考虑液气比对分离效果的影响。建立了萃取精馏在三角相图中的几何意义,用浓度杠杆规则可以计算萃取剂的用量。计算结果合理,且符合精馏的各种规律。 相似文献
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加盐萃取精馏分离邻二甲苯-苯乙烯的研究 总被引:1,自引:0,他引:1
测定了不同萃取剂和盐对邻二甲苯-苯乙烯近沸程物系相对挥发度的影响,研究了盐质量浓度、萃取剂加入速率和回流比对加盐萃取精馏的影响,并建立了反映塔顶馏出液中邻二甲苯质量分数与各因素关系的回归模型。研究结果表明,环丁砜(DMSO)-水(质量分数3%)-硫氰酸钾(KCNS,0.03 g/mL)可作为加盐萃取精馏分离邻二甲苯和苯乙烯体系的最佳加盐萃取剂。 相似文献
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N-甲基乙酰胺萃取精馏醋酸脱水过程模拟计算 总被引:2,自引:0,他引:2
以N-甲基乙酰胺作萃取剂,选择NRTL-HOC相平衡模型,应用过程模拟软件Aspen plus对萃取精馏分离醋酸水溶液过程进行了模拟计算,讨论了回流比、溶剂比、进料位置对分离过程的影响,确定了系统的灵敏板位置,获得了对醋酸一水体系萃取精馏过程生产具有指导意义较佳的操作参数。同时对萃取精馏与普通精馏工艺的过程能耗进行了比较,前者显著低于后者。 相似文献
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引 言鱼油中富含二十碳五烯酸 (EicosapentaenoicAcid,EPA )和二十二碳六烯酸 (DocosahexaenoicAcid ,DHA) ,EPA主要用于治疗心血管系统疾病 ,而DHA对人脑健康营养起重要作用 ,鉴于此 ,近年来EPA、DHA的分离提纯引起了国内外学者的高度重视[1,2 ] .但迄今为止 ,采用超临界CO2 萃取精馏提取到高纯度EPA乙酯、DHA乙酯的报道还不多见 ,这方面的实验数据也不足 .为此 ,本文以经过AgNO3水溶液络合后的高度不饱和脂肪酸酯为原料 ,进行超临界CO2 萃取精馏实验研究 ,以补… 相似文献
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Fish oil ethyl esters complexed with aqueous silver nitrate solution were extracted and rectified by supercritical CO2 to obtain DHA ester and EPA ester with high purity. The effects of some independent variables,such as extraction pressure, temperature gradient of rectifying column and programmed pressure,on rectification were investigated.The results showed that programmed pressure is suitable for purification of EPA and DHA esters. Increase of column temperature gradient from bottom to top is one of the key elements in rectification. Furthermore, higher temperature gradient leads to better separation effect. 相似文献
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V. A. Itskovich A. M. Syroezhko A. V. Merezhkin A. Fugaliya V. V. Vasilev V. M. Strakhov A. S. Lavrova 《Coke and Chemistry》2017,60(5):203-210
The composition of narrow fractions of shale gasoline extracted from LTC (low-temperature carbonization) tar is determined by rectification and gas chromatography–mass spectrometry. The LTC tar is derived from high-sulfur Mishor Rotem shale. The fractions considered are <77°C, 77–85°C, 85–105°C, 105–115°C, 115–130°C, and 130–150°C. The selective extractants N,N-dimethylformamide and N-methylpyrrolidone are used in extractive rectification of the gasoline, toluene, and xylene fractions of the LTC shale tar. The material balances are determined, and the composition of the distillates and bottoms obtained are determined. The results show that it is possible, in principle, to extract thiophene and its homologs from these fractions by extractive rectification using selective extractants. 相似文献
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Qingli Qian Hongxing WangPeng Bai Guoqing Yuan 《Chemical Engineering Research and Design》2011,89(12):2560-2565
The effects of water on steam rectification, i.e., multi-stage saturated steam distillation, were investigated in a packed column. N-octane-p-xylene and 1,3,5-trimethylbenzene-1,2,4-trimethylbenzene were used as test systems. Both binary systems are nearly ideal systems and insoluble in water, thus the effects of water in steam rectification can be clearly and definitely revealed. Such unpolar organic liquid is named as “oil”. The water/oil at column top can be separated and refluxed at different ratio. Compared with conventional rectification, there are some peculiar phenomena in steam rectification. Water greatly enhances the flooding vapor velocity of the rectification, in addition, water plays a predominant role in pressure drop of the packed bed near flooding point. It is clear that liquid water in the packed bed can promote mass transfer of steam rectification, especially for materials with higher viscosity. In a word, steam rectification can be operated at low temperature with good mass transfer. 相似文献
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热聚法合成双环戊二烯石油树脂 总被引:9,自引:0,他引:9
采用精馏分离工艺提取乙烯裂解副产物C5馏分中的双环戊二烯(DCPD),利用DCPD馏分与溶剂油按一定比例混合,在一定温度和压力的条件下通过自由基聚合反应得到双环戊二烯石油树脂,研究了反应温度、恒温搅拌时间及不同溶剂等对双环戊二烯石油树脂质量的影响,确定了双环戊二烯石油树脂热聚合温度、压力、老化时间等工艺条件。 相似文献
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针对山东滨化集团有限责任公司离子膜法烧碱生产装置整流系统存在的实际问题推导出整流控制系统的2个经验公式,用于解决部分整流系统的实际问题.根据在新整流控制系统调试过程中做假负载试验时存在的问题提出优化组合整流变压器挡位的建议,可在调试时节约投资成本,在运行后可延缓整流设备的老化. 相似文献