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化工学报  2015 

陶瓷膜反应器用于氯化亚铜催化剂的制备

DOI: 10.11949/j.issn.0438-1157.20150801, PP. 3029-3035

Keywords: 氯化亚铜,,二甲基二氯硅烷,催化剂,固定床

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Abstract:

将沉淀反应器与陶瓷膜耦合构成一体式膜反应器,用于制备单分散高活性球形CuCl颗粒。考察陶瓷膜孔径、操作条件和沉淀反应条件对CuCl颗粒形貌和粒径分布的影响,评价氯化亚铜的催化性能。结果表明,陶瓷膜的孔径对CuCl平均粒径影响显著,但对颗粒形貌影响不大;稳定剂对催化剂形貌影响显著,聚乙烯吡咯烷酮K-30(PVP)的加入使CuCl颗粒由三角形变为球形,使得颗粒粒径更加均一。在铜离子浓度为0.1mol·L-1,PVP浓度为1mg·ml-1和进料速率为40ml·min-1的条件下,采用平均孔径为0.05mm的陶瓷膜分散Na2SO3溶液,可以制备出平均粒径为5.1mm的单分散球形CuCl颗粒;该颗粒用于直接法制备有机硅单体的反应中,二甲基二氯硅烷的选择性和硅粉的转化率分别为94%和38%,优于商业化氯化亚铜的催化性能。通过比较不同制备条件下氯化亚铜颗粒的催化性能,发现相比于三角形颗粒,形貌规整的球形氯化亚铜对M2的选择性更高。

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