共查询到18条相似文献,搜索用时 171 毫秒
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在对异丙醚的生产方法和作用进行简介的同时,着重对从异丙醇副产叠合油中提取高纯度异丙醚的方法进行了论述,并对所得到的工艺流程进行了交代。 相似文献
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采用双循环汽液平衡釜测定了异丙醇—异丙醚二元体系在常压下的汽液平衡数据,实验结果经Herrington方法检验符合热力学一致性。应用Margules、Van Laar、Wilson、NRTL4种方程对其进行关联,求出模型参数,利用所得模型参数计算相应的汽相组成,并与实验值比较,两者符合良好。 相似文献
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二甲醚精馏塔实验研究与模拟计算 总被引:4,自引:2,他引:2
建立了用于二甲醚精制的精馏塔实验流程,实验测定了在操作工艺条件下的精馏结果。以平衡级理论为依据建立二甲醚精馏过程的数学模型,根据研究体系在通常情况下沸点相差较大、液相非理想性的特点,建立序贯收敛的循环嵌套迭代计算方法对模型进行求解,模拟计算结果与实验数据结果吻合较好。对二甲醚精馏塔的模拟分析结果表明:塔顶要得到含量不小于99 %(mol)二甲醚产品,维持操作压力1 MPa、在精馏塔中部进料的情况下,进料量不超过22 mol·h-1为宜;回流比要根据进料液中二甲醚组分含量控制在一定范围内;进料液中二氧化碳含量高低对产品二甲醚纯度和收率影响显著,在进入精馏塔之前尽可能地将二氧化碳除去是必要的。 相似文献
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Six mixed matrix membranes (MMMs) were prepared using zeolites of 4A and ZSM-5 incorporated in polyimide of Matrimid 5218. Effects of filler type on membrane morphology and pervaporation performance of MMMs were investigated using isopropanol dehydration. In addition, effects of operating temperature (30, 40, 50, and 60 °C), feed water concentration (10, 20, 30, and 40 wt.%) and permeate side pressure (0 and 15 torr) on pervaporation performance were studied. Scanning electron microscopy (SEM) analysis showed there were good adhesion between the fillers and the polymer matrix. Zeolite 4A has a better contact with the polymer phase and thereby nearly no void is formed in the MMM structure. Pervaporation were performed based on L16 array of Taguchi method for design of experiments. The results showed that the best separation condition is achieved at temperature, feed water concentration, and permeate pressure of 30 °C, 10 wt.% water and 0 torr, respectively. Selectivities of zeolites 4A and ZSM-5 filled MMMs were calculated as 8991 and 3904 compared with 1276 measured for the neat Matrimid 5218 membrane. Permeation rates of the zeolite 4A and ZSM-5 filled MMMs and the neat polymeric membrane were found to be 0.018, 0.016, and 0.013 kg/m2 h, respectively. 相似文献
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采用多级离子交换法对加氢精制催化剂载体进行脱钠处理,考察了铵盐种类、浸泡时间、交换温度和铵盐浓度对脱钠效果的影响。以浸泡时间、交换温度和铵盐浓度3个主要影响因素做Box-Behnken实验设计,钠含量为响应函数,建立相应数学模型。实验结果表明,脱钠效果较优的铵盐为乙酸铵。最佳工艺条件:浸泡时间为60 min、交换温度为60 ℃、铵盐质量分数为5.5%。Box-Behnken实验设计法用于加氢精制催化剂载体脱钠工艺优化是可行的,数学模型的预测值与实验观察值相符。 相似文献
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聚醚醚酮生产过程中,反应产物、原料、溶剂及副产物混合在一起,为了得到纯的聚醚醚酮需对其聚合产物进行精制。针对现行生产工艺流程较长、能耗及水耗较大的特点,依据实验数据,对现行工艺、设备进行改进。将分散的、单一功能设备综合在一起,先经丙酮浸取,除去溶剂二苯砜;再经水洗除去氟盐等水溶性物质;最后经过真空转筒干燥得到纯物料,上述3步精制过程在同一设备中实现。使用改进后设备进行生产,聚醚醚酮精制时间为22 h,并且干燥后物料含水质量分数达到0.02%,物料的粉化率也仅为2.85%。经实际生产证明,改进后工艺集中,操作简化,精制时间较原工艺缩短31 h,同时降低了能耗,节约超纯水用量,较大程度地提高了生产效率。 相似文献
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Zhigang Lei Jianwei Li Chengyue Li Biaohua Chen 《Korean Journal of Chemical Engineering》2006,23(2):264-270
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. 相似文献
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We have developed zeolite 5A and 13X embedded P84 co-polyimide membranes with enhanced permeability and selectivity for the pervaporation dehydration of isopropanol (IPA). It is found that a higher annealing temperature, i.e., is more favorable to improve adhesion between zeolite and polymer phase, and to enhance charge transfer complexes (CTCs) formation. FESEM, DSC and gas permeation results show that zeolite 13X has better compatibility with the matrix polymer than zeolite 5A because of stronger interactions between Na cations in zeolite 13X framework and electron acceptor groups of P84 polyimide. The addition of zeolite into the P84 dense membrane improves water sorption capacity and pervaporation separation performance significantly. Owing to the bigger pore size, larger pore volume, higher sorption capacity and better adhesion, the zeolite 13X incorporated P84 membranes has a much higher permeability than zeolite 5A filled membranes. Interestingly, both have comparably high selectivity possibly because of the effects of chain rigidification and partial pore blockage. The addition of zeolite 13X reduces activation energy for water permeation through the membrane but increases that for IPA permeation. However, the addition of zeolite 5A increases activation energy for both water and IPA permeation. Pervaporation permeability increases with zeolite 13X loading, while the selectivity achieves the maximum at 30 wt% zeolite 13X loading. When the zeolite 13X loading approaches 40 wt%, the adhesion between zeolite and polymer becomes poor and the membrane selectivity declines. A comparison between pervaporation and gas separation results reveals that pervaporation membranes can tolerate a higher degree of interstitial defects than gas separation membranes because of stronger molecular interactions between the feed and the polymer, and the larger molecular size difference between penetrants in the former. 相似文献
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介绍了PET生产中粗EG精制常用的连续化和间歇精制的流程,针对年产1.5万t改性PET的粗EG处理项目,从工艺复杂性、设备配置、可操作性、产品品质及投资等方面进行比较,间歇精制为适合该项目的流程。 相似文献