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异丙苯法生产苯酚丙酮工艺探讨 总被引:1,自引:0,他引:1
苯酚和丙酮是重要的化工原料。在我国,近年来的苯酚、丙酮市场相当活跃。异丙苯法是苯酚、丙酮的代表性工业制备方法,主要由烃化、氧化、精制、回收四个工序组成。而在合成异丙苯阶段使用沸石分子筛为催化剂,具有收率高、产品质量好、操作费用低、无腐蚀等优点。本文简要介绍了我国异丙苯法生产苯酚丙酮的现有技术,并对以沸石分子筛为催化剂的异丙苯法生产苯酚丙酮的生产工艺进行了详细探讨。 相似文献
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1 前言 吉化公司1993年2月宣布购买美国UOPSAP(固体磷酸)8.0万t/a异丙苯技术。经三年半建设已于1996年8月4日生产出合格异丙苯产品。在此期间,有五种工业沸石异丙苯技术问世。它们是:Mobil/Badger;DOW/Kel-logg;UOP Zeolite;Eni Chem沸石异丙苯技术和Lummus ABB/Chem Reseach Licen sing CDCumene沸石异丙苯技术。 相似文献
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沸石液相烃化合成异丙苯中烷基转移技术进展 总被引:4,自引:0,他引:4
多异丙苯烷基转移是苯与丙烯烃化合成异丙苯工艺的重要组成部分。本文介绍了工业化沸石液相烃化中烷基转移技术的特点, 综述了多异丙苯烷基转移催化剂的研究进展, 总结了多异丙苯烷基转移反应的基础研究, 以期对研制高活性催化剂、提高选择性、抑制正丙苯生成、延长催化剂使用寿命等有所裨益, 使沸石液相烃化技术更具竞争力。 相似文献
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采用汽相法(VPT)制备了以成型干胶颗粒为基体的MCM-22分子筛催化剂.利用XRD、SEM和BET测试技术对所制备催化剂进行了物相表征、形貌观察和织构分析,并以苯和丙烯烷基化合成异丙苯为模型反应,在液-固固定床反应器上对所制备催化剂的性能进行了评价.结果表明:汽相法制备的MCM-22分子筛催化剂不仅具有较好的结晶度和较高的微孔表面积,而且具有更好的晶体生长取向性和更加致密的结构;在烷基化反应中也具有很好的活性、选择性和稳定性,特别是对目的产物异丙苯的选择性明显高于水热法(HTS)合成的催化剂,在异丙苯合成上具有很好的应用前景. 相似文献
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催化精馏合成异丙苯过程催化剂装填结构研究 总被引:2,自引:0,他引:2
为考察不同催化剂装填结构对催化精馏合成异丙苯过程的影响 ,在热态反应器中进行苯烃化催化精馏合成异丙苯的研究。反应器直径为 3 0mm ,高 2 0 0 0mm ,所用催化剂为 β改性沸石分子筛。操作压力0 .7MPa ,温度 43 0— 480K ,苯质量空速 4— 6h- 1 ,苯烯摩尔比 1.1— 2 .2 ,回流比 9— 2 0。催化剂装填结构由不锈钢填料与催化剂颗粒组成 ,三种装填结构的空隙率分别为 85 .1% ,81.6%和 79.4%。结果表明 ,对于异丙苯合成体系 ,装填结构对催化精馏的总体效果起决定性影响。在催化剂装填总量不变的前提下 ,异丙苯的选择性与丙烯的转化率均随催化剂装填结构空隙率的提高而提高。在优化条件下 ,异丙苯的选择性达97% ,丙烯转化率接近 10 0 %。催化剂装填结构对异丙苯选择性的影响比对丙烯转化率的影响更显著 相似文献
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实验考察了醋酸胶溶剂对Hp分子筛催化剂成型强度的影响,并以丙烯和苯合成异丙苯为模型反应,分别以气-液半连续和液-液连续操作两种方式,实验评价催化剂的性能。结果表明:催化剂强度随成型过程中醋酸用量的增加呈现先增大后减小的趋势,最高催化剂强度对应的醋酸用量为6%。随着醋酸用量增加,催化剂活性略有增加,对异丙苯选择性影响不大,但催化剂稳定性却降低。 相似文献
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Benzene alkylation with propylene over a Ca modified HY zeolite to obtain cumene has been studied. Time on stream behavior of the catalyst was quite steady without any sign of deactivation and the results were reproducible. The external mass transfer does not influence the cumene reaction. The pore diffusion has a substantial influence on the cumene reaction only in the final region of the reactor, where the olefin concentration is very low. A simple power law kinetic model fits the experimental data significantly better than other models. A general time and space dependent model was developed to analyze the performance of a two‐phase downflow fixed bed reactor used for alkylation of benzene with zeolite catalyst. The model could be instructive in exploratory simulations evaluating the conditions for benzene alkylation in liquid phase. 相似文献
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A novel reactor design has been completed and tested for catalytic separation and production of cumene. Use of a reactive separation column packed with a solid acid catalyst where simultaneous reaction and partial separation occur during cumene production allows separation of unreacted excess benzene from other products as they form. This high yielding system allows for one step processing of cumene, with reduced need for product purification. Beta catalysts produced promising results, including cumene selectivity for catalytic separation reactions starting at 85% and cumene reaction yield up to 30% at a reaction temperature of 115 °C. Simultaneously, up to 76% of unreacted benzene was separated from the products. 相似文献
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进行了Y沸石改性催化剂液相烷基化工艺条件对副产物正丙苯生成影响的实验,考察了液相烷基化中副产物正丙苯生成途径。结果表明,液相烷基化反应产物中总的正丙苯生成量,除了丙烯与液相苯烷基化反应直接生成外,一半以上是由于多异丙苯烷基转移反应生成的。通过正丙苯生成动力学的研究,得到了463-478K温度下液相烷基化过程总的正丙苯生成的速率方程和其中烷基转移生成正丙苯的速率方程。 相似文献
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Alkylation reactions of benzene with propylene using heterogeneous catalysts H+-β zeolite, MCM-22, and ZSM-5 were studied for their affinity for cumene production. This work focused on the gas-phase reaction using different crystalline catalysts at several temperatures and amounts of reactants using both batch and continuous fixed-bed reactors. The properties of baseline commercial H+-β catalysts versus versions modified with Ga, La, and Pt were studied. Quantitative analysis of product mixture was performed by gas chromatography. For the batch reactor, β-zeolite produced the highest cumene yield and selectivity of 72% and 92%, respectively, at 225°C. At this temperature, a benzene:propylene dilution of 7:1 molar ratio was the optimum. For the continuous system, cumene production is favored at lower space velocities, higher benzene-to-propylene ratio, and temperatures close to 225°C. Ga modification of the H+-β zeolite significantly enhanced cumene yield in the continuous fixed-bed reactor at 225°C, from 27% of the unmodified β-zeolite to 36% for the Ga-modified one. The life span of modified β-catalysts was studied in the fixed-bed reactor for the first eight hours of reaction. 相似文献