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Method for preparing olefin copolymer

An olefin copolymer and a technology for copolymerization, which is applied in the field of preparing olefin copolymers, can solve the problems of difficulty in producing olefin copolymers, easy pipe blockage and the like, and achieve high product quality, low cost and low olefin copolymer oligomer content. Effect

Active Publication Date: 2014-03-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since low molecular weight copolymers are easily dissolved in solvents, on the one hand, it is easy to cause pipe plugging during the treatment process; on the other hand, it is difficult to produce medium and low density olefin copolymers with high comonomer content

Method used

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  • Method for preparing olefin copolymer
  • Method for preparing olefin copolymer
  • Method for preparing olefin copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add 6L of hexane (HX), 0.72g of NT-1 type TiCl provided by China Academy of Petrochemical Sciences to a 10-liter vertical stirred tank purged with nitrogen 4 / MgCl 2 Catalyst (Ti = 4.8% by weight) and 6.2 g of triethylaluminum. The concentration of catalyst and triethylaluminum in the still is 0.12mmol Ti / L HX and 9mmol Al(C 2 h 5 ) 3 / L HX. The feed flow rate of ethylene was 17.5 g / min, the volume ratio of hydrogen to ethylene was controlled to be 5:1, and homopolymerization was carried out at a temperature of 85° C. and a pressure of 0.6 MPa for 2 hours. The polymer concentration in the slurry reached 350 g PE / L HX.

[0039] The obtained polymer had a melt flow rate of 500 g / 10 min, a weight average molecular weight (Mw) of 34,630, a number average molecular weight (Mn) of 8,418, a polydispersity index of 4.11, and a fraction of Mw<10,000 of 30.3%.

[0040]The homopolymerized slurry is sent to a horizontal tank for solvent removal and drying by using pressure di...

Embodiment 2

[0044] Add 6L hexane (HX), 0.84g NT-1 type TiCl4 / MgCl provided by China Academy of Petrochemical Sciences to a 10-liter vertical stirred tank purged with nitrogen 2 Catalyst (Ti = 4.8% by weight) and 6.2 g of triethylaluminum. The concentration of the catalyst and triethylaluminum in the still is 0.14mmol Ti / L HX and 9mmol Al(C 2 h 5 ) 3 / L HX. The feed flow rate of ethylene was 20 g / min, the volume ratio of hydrogen to ethylene was controlled to be 10:1, and homopolymerization was carried out at a temperature of 85° C. and a pressure of 0.8 MPa for 1.5 hours. The polymer concentration in the slurry reached 400 g PE / L HX.

[0045] The obtained polymer had a melt flow rate of 800 g / 10 min, a weight average molecular weight (Mw) of 36,690, a number average molecular weight (Mn) of 4,600, a polydispersity index of 7.98, and a fraction of Mw<10,000 of 36.7%.

[0046] Adopt 2 filter presses installed respectively on the upper and lower parts of the kettle to filter, use 6L hex...

Embodiment 3

[0050] Add 6L of hexane (HX), 0.48g of NT-1 type TiCl provided by China Academy of Petrochemical Sciences to a 10-liter vertical stirred tank purged with nitrogen 4 / MgCl 2 Catalyst (Ti = 4.8% by weight) and 4.1 g of triethylaluminum. The concentration of the catalyst and triethylaluminum in the still is 0.08mmol Ti / L HX and 6mmol Al(C 2 h 5 ) 3 / L HX. The feed flow rate of ethylene was 10.0 g / min, the volume ratio of hydrogen to ethylene was controlled to be 7:1, and homopolymerization was carried out at a temperature of 80° C. and a pressure of 0.4 MPa for 3 hours. The polymer concentration in the slurry reached 400 g PE / L HX.

[0051] The melt flow rate of the obtained polymer was 600 g / 10 min, the weight average molecular weight (Mw) was 43,830, the number average molecular weight (Mn) was 18,730, the polydispersity index was 2.34, and the fraction of Mw<10,000 was 21.0%.

[0052] The solvent removal and drying in the second section are directly carried out in the ho...

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Abstract

The invention relates to a method for preparing an olefin copolymer. The method comprises the following steps of: polymerizing monomers by using a slurry process in a first working section to obtain a polymer; removing a solvent and oligomers dissolved in the solvent from the polymer and drying in the same device in a second working section; and carrying out gas-phase copolymerization on the obtained polymer and monomers to obtain the olefin copolymer, wherein the solvent and the oligomers dissolved in the solvent are removed by using a filter press in the second working section. The method is simple and feasible and is low in cost, the oligomer content of the olefin copolymer obtained through the method is low, and the quality of a product is high.

Description

technical field [0001] The present invention relates to a method for preparing olefin copolymers, and more particularly, to a method for preparing olefin copolymers having a low oligomer content. Background technique [0002] In the case of two-stage slurry production of olefin copolymers, the second-stage copolymerization is carried out in a solvent. Since low molecular weight copolymers are easily dissolved in solvents, on the one hand, it is easy to cause pipe plugging during the treatment process, and on the other hand, it is difficult to produce medium and low density olefin copolymers with high comonomer content. [0003] Chinese invention patent application CN 1213667A published on April 14, 1999 describes a method for preparing olefin copolymers, wherein the first section is the homopolymerization or copolymerization section of the olefin solvent slurry method, and the second section is through a pressurized centrifuge The section where the solvent in the slurry is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F255/02C08F110/02C08F110/06C08F2/04C08F6/10C08F2/34
Inventor 孟伟娟张欣王健张月红杜影唐伟刚
Owner CHINA PETROLEUM & CHEM CORP