基于超声破碎测定聚丙烯球形催化剂强度的方法  

DETERMINATION OF SPHERICAL CATALYST STRENGTH FOR POLYPROPYLENE BY ULTRASONICATION

作　　者：岑为[1] 夏先知[1] 刘月祥[1] 毛炳权[1] 

机构地区：[1]中国石化北京化工研究院,北京100013

出　　处：《石油炼制与化工》2014年第8期17-21,共5页Petroleum Processing and Petrochemicals

基　　金：中国石油化工股份有限公司资助项目(44-BS1302)

摘　　要：建立了基于超声破碎仪和激光粒度仪测定聚丙烯球形催化剂强度的方法,考察了超声功率、搅拌速率、溶液浓度、超声探头伸入溶液的深度等条件对超声破碎效果的影响,对比研究了催化剂载体和催化剂的强度。结果表明:对于GS13L型超声探头,在其所限制的超声功率范围内功率变化对破碎效果几乎没有影响;在不搅拌情况下进行超声处理时样品几乎无法破碎,在200r/min的低速搅拌下,破碎效率较高,而搅拌速率提高到400r/min时破碎效率反而降低;溶液浓度越高,破碎效率越低;超声探头伸入溶液的深度大于20mm时也会降低破碎效率。聚丙烯球形催化剂的强度低于其载体的强度,而且载体强度越高,由其制备的催化剂的强度也越高。本课题建立的超声破碎法为研究载体和催化剂的强度与其物理和化学性能之间的关系奠定了基础。A method for determining spherical polypropylene catalyst strength by ultrasonication with a laser particle size analyzer is founded. The effect of ultrasonic power, stirring speed, concentration of the solution, the depth of the ultrasonic probe inserted into the solution on catalyst crush was investigated. Moreover,the strength of spherical polypropylene catalyst and their carrier were also measured for comparison. The tests indicate that for GS13L ultrasonic probe, the power tested within the specified range has no effect on the degree of fragmentation. No crushing of the sample was observed without stirring during ultrasonic process. The degree of fragmentation is higher at 200 r/min speed of stirring than that of 400 r/min stirring speed. It is found that the degree of fragmentation decreases with increase of the concentration of the solution. When the depth of the ultrasonic probe inserted into the solution is larger than 20 mm, the efficiency of fragmentation will decline. In addition, it shows that the greater the strength of the carrier is, the greater the strength of the catalyst is. The strength of spherical polypropylene catalyst is lower than that of its carrier. The ultrasonieation method builds a platform for further study on the relations between the strength and the physicochemical properties of catalyst and carriers.

关 键 词：超声破碎 强度 聚丙烯催化剂 载体 

分 类 号：TQ426[化学工程]