A precise metering method for catalyst configuration of ultra-high molecular weight polyethylene unit

Abstract

The invention discloses a precise metering method for the catalyst configuration of an ultra-high molecular weight polyethylene device. The solid powder main catalyst and refined hexane are metered and then sent to a receiving tank for dilution, and then the main catalyst solution is sent to the main catalyst metering cylinder for precise metering and then delivered. to the dilution tank, and use the diluent from the dilution hexane pipeline to control the liquid level of the main catalyst solution in the dilution tank through the main catalyst metering cylinder. The co-catalyst is sent to the dilution tank by pressure; during the polymerization reaction, the prepared co-catalyst solution is metered and then pressed into the dilution tank. After the main catalyst, co-catalyst and hexane are mixed evenly, the screw pump is used to measure and pressurize and then enter the polymerization tank. In the present invention, the metering cylinder of the present invention has accurate scale markings, and the metering scale of the catalyst can be seen directly and accurately, so as to ensure that the catalyst is metered in the metering cylinder and the catalyst controls the medium-speed reaction of the ultra-high molecular weight polyethylene in the polymerization kettle.

Description

technical field [0001] The invention provides a precise metering method for catalyst configuration of an ultra-high molecular weight polyethylene device, and relates to the technical field of catalyst configuration and precise metering. Background technique [0002] In the existing polyethylene plant, the method of catalyst configuration and precise metering is as follows: [0003] Step 1: Put it in the special container 1 (solid powder) for the main catalyst, send it to the receiving tank 2 with 0.6MPa high-purity nitrogen pressure, and send it to the receiving tank 2 after metering refined hexane. Under the action of magnetic stirring in the receiving tank Dilute, configure a suspension solution with a volume concentration ratio of 1:15 (catalyst: hexane), and use 0.6MPa high-purity nitrogen to maintain the pressure of the receiving tank 2 to prevent air from entering. [0004] The second step: use 0.6MPa high-purity nitrogen to send the suspension solution to the meterin...

AI Technical Summary

Problems solved by technology

[0006] The disadvantage of this method is that the amount of catalyst used is at the milligram level, even if it is diluted with hexane, it is only a few grams. The measurement accuracy of the bench scale is not enough, and the error is large. To achieve the desired effect; if the error of the amount of catalyst is negative, the reaction speed of the polymerization tank will be too slow, and the reaction cannot even be initiated

Catalyst metering is difficult to control

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