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Recovery method of polyolefin catalyst mother liquid

A polyolefin catalyst, mother liquor recovery technology, applied in chemical recovery, titanium halide and other directions, can solve the problems of high energy consumption, blockage and other problems, achieve the effect of saving equipment investment, short process flow, and reducing the number of equipment

Active Publication Date: 2014-07-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of tower clogging, device material consumption and high energy consumption in the prior art, the present invention provides a polyolefin catalyst mother liquid recovery method, which reduces the number of equipment, saves device investment, and solves the problem of high boiling The problem of tower plugging improves the recovery rate of titanium tetrachloride and reduces the energy consumption of the device

Method used

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  • Recovery method of polyolefin catalyst mother liquid
  • Recovery method of polyolefin catalyst mother liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A polyolefin catalyst mother liquor, wherein the content of titanium tetrachloride is 82% (weight), the content of hexane is 13%, and the content of heavy component high boilers is 5%,

[0040] Catalyst mother liquor 1 enters the middle and upper part of fractionation tower C1, the feed rate is 1000kg / h, the fractionation tower is a packed tower, and the filler is IMTP 25# bulk packing. The number of trays in this tower is 40, and the tower top pressure is 105KPa. The pressure is 120KPa, the reflux ratio is 0.5, after the tower top gas phase is condensed by the fractionating tower condenser E1, 33.3% is refluxed, and the hydrocarbon solvent product 2 (hexane fraction) is extracted from the remaining liquid phase;

[0041] The gas phase is extracted from the side line in the middle of the tower, and the titanium tetrachloride product 3 is extracted after being condensed by the side line condenser E2;

[0042] 50% of the material at the bottom of the tower goes to reboile...

Embodiment 2

[0049] A mother liquor of polyolefin catalyst, wherein the content of titanium tetrachloride is 80% (weight), the content of hexane is 15%, and the content of heavy component high boilers is 5%,

[0050] Catalyst mother liquor 1 enters the fractionation tower C1, the feed rate is 2000kg / h, the fractionation tower is a packed tower, the rectification section and the stripping section all use IMTP 25# bulk packing, the number of trays of this tower is 40, and the tower top pressure It is 30KPa (G), the pressure at the bottom of the tower is 40KPa, and the reflux ratio is 0.6. After the gas phase at the top of the tower is condensed by the fractionating tower condenser E1, 37.5% is refluxed, and the hydrocarbon solvent product 2 (hexane fraction) is extracted from the remaining liquid phase;

[0051] The gas phase is extracted from the side line in the middle of the tower, and the titanium tetrachloride product 3 is extracted after being condensed by the side line condenser E2;

...

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Abstract

The invention discloses a recovery method of a polyolefin catalyst mother liquid. The method comprises the steps that (1) the catalyst mother liquid is sent into a fractionating tower, partial of the gas phase at the tower top is refluxed and returned to the fractionating tower after being condensed, and partial of the gas phase at the tower top is used for extracting hydrocarbon solvent products; (2) a gas phase or a liquid phase is extracted from middle-lower portion of the fractionating tower, and can be extracted as a titanium tetrachloride product after being condensated; and that (3) tower bottom materials of the fractionating tower enter into a reboiler and are returned to the bottom of the fractionating tower reactor after being subjected to heating vaporation; and high-boiling residues containing the titanium tetrachloride are extracted from the bottom of the reboiler. The method decreases the number of devices, saves device investment, solves the problem of tower block of the high-boiling residues, increases recovery rate of titanium tetrachloride, and reduces energy consumption of the devices.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a method for recovering polyolefin catalyst mother liquor. Background technique [0002] After the 1990s, with the substantial growth of global polyolefin production capacity, the competition in the polyolefin market has become increasingly fierce. Mastering and adopting advanced technologies and reducing costs have become necessary means to increase product added value and competitiveness. The key to polyolefin technology lies in the catalyst technology. Among various polyolefin catalysts, the Ziegler-Natta catalyst is currently the most widely used. Since it came out in the 1950s, it has been jointly developed and researched by various countries. Continuous improvement has promoted the rapid development of the polyolefin industry. [0003] The preparation of general Ziegler-Natta catalyst is to adopt liquid-phase titanium tetrachloride and the solid support of magnesium-c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/02
CPCY02P20/584
Inventor 罗继红张建新程建民王立成周继东吴瑾孙康
Owner CHINA PETROLEUM & CHEM CORP
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