Application of supported non-metallocene catalyst in ethene polymerization process by slurry method

Abstract

The invention discloses an application of load non- metallocene catalyst in the slurry process for vinyl polymerying, the load non- metallocene catalyst and catalyst promoter forming the catalytic system, the alkene polymerization comprising: vinyl homopolymerization, combined polymerization of vinyl with propylene, butylenes, hexane, octane or norbornene; the catalyst carrier being chosen from: inorganic oxide of metallic oxide from IIA, IIIA, IVA, and IVB groups, or oxided mixture and mixing oxide; the catalyst promoter being chosen from: methylaluoxane, ethylaluoxane, isobutylaluoxane, trimethylaluminum,triethylaluminum,triisobutylaluminum,methylaluoxane-trimethylaluminum or methylaluoxane-triethylaluminum; the mole proportion between the catalyst promoter and catalyst being Al / Ti= 1:1-500. The inventioin is characterized by the less methylaluoxane consumption, stable reaction, easy-to-control polymerization temperature and non still-sticking phenomenon. The produced polyolefine possesses perfect granual shape, and the maximum polymer clamp density can reach 0.385 g / ml.

Description

technical field [0001] The invention belongs to the ethylene polymerization process, and relates to the application method of the supported non-metallocene olefin polymerization catalyst in the slurry ethylene polymerization process, in other words, it is a low-pressure slurry ethylene polymerization process using the supported non-metallocene olefin polymerization catalyst method. Background technique [0002] The coordination atoms of non-metallocene olefin polymerization catalysts are oxygen, nitrogen, sulfur and carbon, etc., and do not contain cyclopentadiene groups. It was discovered and studied in the early 1990s, and its catalytic activity can reach or even exceed Metallocene olefin polymerization catalysts, and at the same time maintain the advantages of metallocene catalyst systems, such as controllable polymers, narrow molecular weight distribution, molecular tailoring of polymers, and controllable molecular weight and branching degree of polymers. Oxygen is weak...

AI Technical Summary

Problems solved by technology

[0008] Catalysts supported on anhydrous magnesium chloride show high catalytic activity in olefin polymerization, but such catalysts are very brittle and break easily in the polymerization reactor, resulting in poor polymer morphology

Silica-supported catalysts have good fluidity and can be used in gas-phase fluidized bed polymerization, but silica-supported metallocene and non-metallocene catalysts show lower catalytic activity

However, after the non-metallocene catalyst is supported by an inert carrier, the catalytic activity of olefin polymerization will be more or less reduced, and some even reduce the activity by more than an order of magnitude, which leads to the uneconomical application of the supported catalyst.

What's more, after the activity is reduced, the ash content of the obtained polymer increases, and an additional deashing process is required in the production, which leads to an increase in cost and complexity of the production device, which limits its further application in the catalytic production of polyolefins

Images