从异丙醇装置副产中分离精制异丙醚的工艺研究

采用萃取精馏和共沸精馏的试验方法,从异丙醇装置副产中分离精制异丙醚可以得到纯度大于99％的异丙醚和纯度大于99．5％的异丙醇,并且产率较高,具有明显的经济效益。     

从异丙醇装置副产中分离精制异丙醚的工艺研究

采用萃取精馏和共沸精馏的试验方法，从异丙醉装置副产中分离精制异丙醚可以得到纯度大于99％的异丙醚和纯度大于99．5％的异丙醇，并且产率较高，具有明显的经济效益。     

异丙醇生产副产物中异丙醚的分离精制技术

采用萃取精馏和共沸精馏的试验方法,从异丙醇装置副产品中分离精制异丙醚．结果表明,以甘油为萃取剂,甲醇为夹带荆,可分别得到质量分数大于99％的异丙醚和质量分数大于99．5％的异丙醇,异丙醚收率为70．35％,具有明显的经济效益。     

从异丙醇副产叠合油中提取高纯度异丙醚

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。     

异丙醇装置副产二异丙醚精制过程模拟研究

对异丙醇装置副产二异丙醚的分离提纯工艺进行模拟与优化,以水作为萃取剂,基于NRTL模型,使用Aspenplus化工模拟软件的Extract和Radfrac模块进行萃取和精馏模拟,并利用灵敏度分析工具对精馏塔工艺参数进行优化。结果表明,以水做萃取剂再经过精馏工艺提纯二异丙醚是可行的。优化得到最佳工艺参数为精馏塔为30块塔板,原料进料位置在第11块。质量回流比为1．5,精馏塔底二异丙醚纯度可达99．99％,模拟和优化结果对工业化设计和生产具有重要的指导意义。     

异丙醚-异丙醇-水三元共沸物的分离

以乙二醇为溶剂,对异丙醚-异丙醇-水三元共沸物采用间歇萃取精馏进行分离研究,考察了在溶剂不同进料速率、回流比、进料温度等条件下的分离情况,找到了实验条件下分离此三元共沸物的最佳条件。最佳条件为：溶剂进料位置为塔顶,回流比为2,溶剂进料速率在分离异丙醚和分离异丙醇两个阶段分别为11.4 g/min和8.08g/min,溶...     

异丙醇装置副产二异丙醚提纯新工艺研究

本文研究了一种提纯异丙醇生产过程中副产物二异丙醚的新工艺。针对丙烯水合反应过程中丙烯缩合等副反应产生的C6烯烃杂质组分沸点与二异丙醚沸点接近,采用常规精馏的方法很难分离,二异丙醚产品纯度低,质量差的问题。提出了一种采用萃取和共沸精馏相结合的提纯异丙醇装置副产物二异丙醚的新工艺。精制提纯后二异丙醚产品纯度提高到99%以上,能够达到煤制气溶剂、医药中间体、色素等行业的要求。     

异丙醚提纯工艺的研究

研究了异丙醚的提纯工艺。采用酸洗的方法,用硫酸做酸化剂与异丙醇副产叠合油中的异丙醚反应,静止分离,水解,精馏得到高纯度的异丙醚。讨论了硫酸质量分数、硫酸与异丙醚的质量比、反应时间对反应的影响,所得异丙醚的质量分数大于99%。     

异丙醇-异丙醚二元体系的汽液平衡数据测定及关联

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。     

氯化石蜡副产盐酸精制的研究

针对氯化石蜡副产盐酸的特点,采用不同过滤介质进行精制试验,并在此基础上对 该工艺进行了经济技术评价。     

二甲醚精馏塔实验研究与模拟计算

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。     

Zeolite filled polyimide membranes for dehydration of isopropanol through pervaporation process

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.     

加氢精制催化剂载体脱钠工艺研究

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。     

4A分子筛吸附净化异丙醇中微量水的研究

对异丙醇中微量水在4A分子筛上的吸附性能进行了研究。对该体系的吸附平衡数据进行了测定,并用Langmuir、Freundlich模型进行拟合且吻合较好;采用Crank单孔模型对测定的吸附动力学数据进行拟合,得到了290K时的有效扩散系数De=3.539×10-8cm2/s;采用固定床测定了不同床层高度、不同流量及不同初始浓度下的动态透过曲线;这些结果为吸附工艺设计提供了基础数据。     

聚醚醚酮精制工艺及设备的设计与运行

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。     

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.     

Zeolite filled P84 co-polyimide membranes for dehydration of isopropanol through pervaporation process

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.     

EG精制间歇和连续流程对比选择

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。