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Separation method for recovering olefin polymerization catalyst mother liquid

A separation method and mother liquor recovery technology, applied in the direction of distillation purification/separation, titanium halide, etc., can solve the problems of device material consumption, tower blockage, high energy consumption, etc., achieve the effects of reduced consumption, improved recovery rate, and saved device investment

Active Publication Date: 2013-06-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of tower clogging, device material consumption and high energy consumption existing in the prior art, the present invention provides an improved separation method for recovering mother liquid of olefin polymerization catalyst

Method used

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  • Separation method for recovering olefin polymerization catalyst mother liquid
  • Separation method for recovering olefin polymerization catalyst mother liquid

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Experimental program
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Effect test

Embodiment 1

[0030] A kind of mother liquor of polyolefin catalyst, wherein the content of titanium tetrachloride is 80% (weight), and the content of hexane is 15%, and the content of heavy component high boiler is 5%, enters the first fractionation column through pipeline 1, The feed rate is 1000kg / h, the first fractionation tower is a packed tower, and the filler is IMTP25# bulk packing. The theoretical plate number of the tower is 15, and the pressure at the top of the tower is 105KPa. The titanium tetrachloride and hexane produced at the top of the tower are The fraction is sent to the second fractionation tower C2 through pipeline 4, and the bottom material enters the wiped-film evaporator, and the gas phase returns to the first fractionation tower, and the high-boiler containing part of titanium tetrachloride is extracted from the bottom of the wiped-film evaporator, and the high-boiler The weight ratio of titanium tetrachloride to titanium tetrachloride is 3.61, and it will be discha...

Embodiment 2

[0037] A kind of mother liquor of polyolefin catalyst, wherein the content of titanium tetrachloride is 85% (weight), and the content of hexane is 10%, and the content of heavy component high boiler is 5%, enters the first fractionation column through pipeline 1, The feed rate is 1000kg / h, the first fractionation tower is a packed tower, the rectification section and the extraction section all use IMTP 25# bulk packing, the theoretical plate number of this tower is 15, the pressure at the top of the tower is 50KPa, and the pressure at the bottom of the tower is 80KPa, the titanium tetrachloride and hexane fraction extracted from the top of the tower are sent to the second fractionation tower C2 through pipeline 4, and the bottom material enters the wiped film evaporator. The operating pressure of the wiped film evaporator is 60KPa, and the vapor phase evaporated by the wiped film evaporator Return to the first fractionation tower, extract high boilers containing part of titaniu...

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Abstract

The invention discloses a separation method for recovering olefin polymerization catalyst mother liquid, and the separation method comprises the following working procedures of: (1), sending the catalyst mother liquid into a first fractionating tower C1; (2), returning a titanium tetrachloride gas phase evaporated by a scraped film evaporator to the tower kettle of the first fractionating tower from the top, extracting a high-boiling substance containing titanium tetrachloride at a tower bottom, and discharging the material from the bottom of the scraped film evaporator; and (3), sending the mixture of a hydrocarbon solvent and titanium tetrachloride into a second fractionating tower C2. The method has the following advantages: firstly, process flow is short, the quantity of equipment is reduced and investment in devices ia lowered, and furthermore the problem that the high-boiling substance blocks the towers is solved; secondly, the recovery rate of the titanium tetrachloride is improved, and the emission of wastewater and waste slag is reduced; and thirdly, the repeated condensation and evaporation of titanium tetrachloride are avoided, and the energy consumption of the devices is decreased.

Description

technical field [0001] The invention relates to a separation method for recovering the mother liquor of an olefin polymerization catalyst, that is, a separation method for materials such as hydrocarbon-containing solvent, titanium tetrachloride and high boiling substances produced in the preparation process of the polyolefin catalyst. Background technique [0002] Titanium tetrachloride is an important raw material for fine chemical industry and an important raw material for synthesizing polyolefin catalysts. Titanium tetrachloride can also be used to make titanium salts, iridescent agents, artificial pearls, smoke screens, pigments, fabric mordants, etc. [0003] Generally, the preparation of polyolefin catalyst is to use liquid phase titanium tetrachloride and solid carrier or catalyst containing magnesium compound to mix and contact for a certain period of time to obtain a highly active Ziegler-Natta catalyst component, and then the obtained solid catalyst The components...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/04C01G23/02
Inventor 罗继红周继东张建新曾宪忠单微杜鑫王帆郑虹玲
Owner CHINA PETROLEUM & CHEM CORP
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