乙二醇独乙醚-甲基异丁基酮-水三元非均相共沸物系分离过程

通过塔釜剩余曲线图、蒸馏边界线、液-液相平衡线等曲线,对乙二醇独乙醚-甲基异丁基酮-水三元非均相共沸物系进行理论分析,确定该物系分离需要共沸精馏、冷凝分相、油相部分回流、重组分回收、轻组分回收等5步工艺.通过流程设计、模拟计算、实验验证等研究,得到质量分数为99.24％甲基异丁基酮,质量分数为99.17％的乙二醇独乙醚...     

异丙醇一步法生产甲基异丁基酮分离过程的研究

本文对异丙醇一步法合成MIBK工艺的分离过程进行了基础测定，包括气液平衡和液液平衡测定。在此基础上。对原有的MIBK分离工艺进行了研究，提出了改进的工艺流程，使MIBK的回收率由32％提高到91．7％．能耗由11,42t水蒸汽／t产品降为8．27t水蒸汽／t产品。     

国内甲基异丁基酮市场情况分析

介绍了国内甲基异丁基酮的应用、供应、需求及价格情况,对国内甲基异丁基酮生产及市场进行了详细的分析及预测,并对国内甲基异丁基酮未来发展提出了建议。今后几年,将是我国甲基异丁基酮的快速发展时期,预计到2015年,我国甲基异丁基酮总产能将超过14万t。     

合成甲异丁酮的工艺研究

介绍了采用固床反应器由丙酮缩合加氢合成甲基异丁基酮的工艺。详细考查了反应温度、压力、空速及原料含水量等条件对反应的影响。结果表明反应温度120℃、压力6Mpa、空速1．0h^-1,原料含水量小于0．5％为最适宜的反应条件,在此条件下丙酮转化率为40％、甲基异丁基酮的选择性为94％。     

甲基异丁基酮市场分析

分析了国内外甲基异丁基酮的生产消费现状及发展前景.2009年,全世界甲基异丁基酮的生产能力约为55.5万t/a,消费量约为32.0万t.目前我国甲基异丁基酮的总生产能力约为10.5万t/a,2009年消费量约为6.6万t.预计2011年和2015年对甲基异丁基酮的需求量将分别达到约8.0万t和11.0万t,产能基本上可...     

甲基异丁基酮的生产技术及市场分析

甲基异丁基酮（MIBK）是合成涂料溶剂和橡胶防老剂的重要原料,其工业生产方法主要有异丙醇法和丙酮法两大类,其中丙酮一步法是目前主要的生产方法。2009年,全世界甲基异丁基酮的生产能力约为55.5万t/a,消费量约为32.0万t。目前我国甲基异丁基酮的总生产能力约为10.5万t/a,2009年消费量约为6.6万t。预计2011年和201 5年对甲基异丁基酮的需求量将分别达到约8.0万t和11.0万t,产能基本上可以满足国内需求。提出了我国甲基异丁基酮行业今后的发展建议。     

气相色谱法测定甲基异丁基酮的纯度及杂质含量

采用气质联用对甲基异丁基酮产品中的杂质进行定性,确定了使用聚乙二醇色谱柱分析甲基异丁基酮纯度及杂质含量的气相色谱条件。重复5次分析甲基异丁基酮样品,各组分分离良好,各组分相对标准偏差不大于1.31%。     

甲基异丁基酮产业现状及发展建议

甲基异丁基酮广泛用于中沸点溶剂和有机合成等领域，章阐述了甲基异丁基酮的生产工艺路线。还对甲基异丁基酮的国内外生产现状进行了分析，并对我国甲基异丁基酮产业的发展提出了建议。     

乙二醇独乙醚-甲基异丁基酮-水三元非均相共沸物系分离研究

实验考察了液液萃取法、加盐分相法、共沸精馏法对乙二醇独乙醚-甲基异丁基酮-水( EC+ MIBK+ H2O)三元非均相共沸物系的分离效果.结果表明:以苯、甲苯、环己烷为萃取剂的液液萃取法分离效果较差;以K2CO3晶体为加盐相的加盐分相法,虽然可以取得较好的分离效果,但是不利于工业化生产;以甲基异丁基酮为夹带剂的间歇式共...     

丙酮一步合成甲基异丁基酮催化剂的研究进展

本文介绍了丙酮一步法合成甲基异丁基酮的工艺过程,并系统地阐述了丙酮一步法制备甲基异丁基酮所用催化剂研究进展情况.在对各类催化剂进行分析比较之后,提出了未来的研究方向.     

异丙醇一步法合成MIBK精馏过程优化

用PROII过程模拟软件对异丙醇一步法合成甲基异丁基酮(MIBK)的精馏系统进行了分析和模拟优化,提出了5塔流程的改进工艺,使MIBK的回收率提高了2.8倍,达到91·7%,而且再沸器能耗由12·79t水蒸气/t产品降低到8·27t水蒸气/t产品。还建立了普通精馏塔和萃取精馏塔小试实验装置,对全工艺流程逐塔进行热态研究,验证了其工业可行性。     

Improvement of separation process of synthesizing MIBK by the isopropanol one-step method

The separation process of synthesizing MIBK (methyl isobutyl ketone) by an isopropanol one-step method, in which the multi-component mixture contains AC (acetone), IPA (isopropanol), water, MIBK, MIBC (methyl isobutyl carbinol), DIBK (di-isobutyl ketone), etc., was studied. As a high-purity of MIBK over 99.5 wt% is required in industry, the development of an effective separation method is urgent. In this work, first, by means of VLE (vapor-liquid equilibrium) experiments and PROII simulation, the possible azeotropes formed in the investigated system were tested. Then, the separation process was simulated with the result that the calculated and designed values were in good agreement, which indicated that the calculated results were reliable. On this basis, the original separation process was improved. In the original separation process, the yield of MIBK for a concentration of MIBK over 99.5 wt% was small, only 32.5%. In the improved separation process (step two), two columns (one extractive distillation column and the other solvent recovery column) were added and some simplification was made so as to recycle MIBK. In this case the yield of MIBK was 91.7%. Moreover, about 27.6% water stream per kilogram MIBK product is saved.     

基于ASPEN软件对比两种萃取剂在煤气化废水酚回收中的应用

针对某煤气化厂酚回收工艺流程净化废水中酚含量未达到生化处理要求的问题,分析认为主要是由于原萃取剂二异丙基醚(DIPE)对酚分配系数过低。然后以对酚的分配系数更高的甲基异丁基酮(MIBK)为萃取剂,重新设计工艺流程并确定新流程的工艺参数同时对其进行模拟计算,结果显示,净化废水酚含量降至362mg/L,能够满足后续生化段要求;与原流程相比,新流程的粗酚回收量约多0.96 t/d。新旧流程经济核算表明,采用MIBK为萃取剂的流程处理每吨水的价格比DIPE为萃取剂低1.6元。     

丙酮一步法生产MIBK装置的副产物精馏分离研究

针对丙酮一步法生产MIBK装置的副产物（丙酮、异丙醇、水、MIBK混合物）,采用间歇精馏分离得到纯度〉98％的丙酮、纯度〉99％的异丙醇和水恒沸物、纯度〉90％的MIBK。对分离得到的纯度〉99％的异丙醇和水恒沸物用乙二醇作为萃取剂进行萃取精馏分离得到纯度99．5％异丙醇,同时减压精馏回收乙二醇。     

One-step synthesis of methyl isobutyl ketone from acetone and hydrogen over Pd/(Nb2O5/SiO2) catalysts

The surface-phase oxides of niobia on silica substrate ((Nb₂O₅/SiO₂), NS(x)) were prepared and characterized. Such oxides were used as supports for palladium catalysts. The one-step synthesis of methyl isobutyl ketone (MIBK) from acetone and hydrogen in liquid phase was also investigated over Pd/NS(x) catalysts. Experimental results indicate that these catalysts were effective for the formation of MIBK; since little of the parallel by-product of isopropanol (IPA) was formed, these catalysts reached selectivities of 88–92% MIBK and 2–3% IPA at 30–35% conversion. The reactivity of Pd/NS(x) declined obviously with an increase of water content that accumulated in a semi-batch reaction system. The water could be partially expelled and the deactivation of catalysts could be improved by using a fixed bed continuous flow reaction system.     

以纳米二氧化锆为载体的Pd催化剂制备及还原缩合性能研究

考察了不同制备方法得到的纳米二氧化锆为载体担载Pd催化剂对丙酮还原缩合的影响。纳米二氧化锆的制备方法对二氧化锆的物理性质和催化性能有较大的影响。不同的沉淀方法、陈化环境制备的纳米ZrO2,对不同的产物有不同的选择性,其中,在母液中373K陈化的二氧化锆为载体的催化剂对二异丁基酮(DIBK)的选择性较高,为61 43%;沉淀剂滴加到盐溶液中得到的二氧化锆为载体的催化剂对甲基异丁基酮(MIBK)的选择性较高,为63 70%。催化剂的酸性和Pd分散度表征结果表明,较高的Pd分散度、合适的酸性有利于MIBK的生成,较高的Pd分散度、较强的酸性有利于DIBK的生成。     

丙酮气相一步法合成甲基异丁基酮催化剂

用浸渍法制备了丙酮一步法合成甲基异丁基酮催化剂,用X射线衍射分析了催化剂的结构,讨论了不同质量含量的Cu、MgO对于丙酮转化为甲基异丁基酮的影响,结果发现当Cu含量为4%(质量分数),MgO含量为20%(质量分数)时,丙酮的转化率最高,为73.96%,并对反应机理进行了初步探讨。     

甲基异丁基酮分离过程中精馏-渗透汽化集成工艺的研究

对丙酮一步法生产甲基异丁基酮(MIBK)部分精馏流程进行了工艺分析,MIBK脱轻塔进料液中少量水的存在使MI-BK脱轻塔运行不稳定,进而影响MIBK合成液的整个分离过程。针对这个问题,提出了精馏-渗透汽化集成的工艺方案,省去MIBK脱轻塔。建立了渗透汽化小试实验,研究了NaA分子筛膜的渗透汽化过程以及分离性能。用Aspen Plus软件对精馏-渗透汽化集成工艺进行了模拟,与精馏过程相比,在MIBK产品质量与收率相同情况下,操作成本降低了20%,总成本可降低15%。     

Chemical conversion and liquid–liquid extraction of 5‐hydroxymethylfurfural from fructose by slug flow microreactor

A dehydration of fructose in the water/methyl isobuthyl ketone (MIBK) biphasic system can yield 5‐hydroxymethylfurfural (HMF) to be successfully extracted into the organic MIBK phase. The HMF production and yield in MIBK phase was discussed by using a simplified model taking into consideration of the slug flow. The extraction resistance of HMF across the interface between water and MIBK depended on the line velocity and the flow rate ratio. It was likely that the velocity field generated in the slug flow contributed to an increase in the mass transfer of HMF. © 2016 American Institute of Chemical Engineers AIChE J, 62: 2135–2143, 2016