Unlock instant, AI-driven research and patent intelligence for your innovation.

Ethylene polymerization or copolymerization method

A technology of ethylene polymerization and copolymerization, which is applied in the field of ethylene polymerization or copolymerization, can solve the problems of polymer sticking blocks, reactor fouling, affecting industrial production, etc., achieve the elimination of wall sticking and pipe plugging, comonomer The effect of reducing the quantity and prolonging the production cycle

Inactive Publication Date: 2005-05-04
CHINA PETROLEUM & CHEM CORP +1
View PDF2 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the copolymerization performance of titanium-based catalysts is poor. In order to obtain lower-density copolymers, the amount of high-level comonomer α-olefins must be increased. When the amount of comonomers is high, the diluent flash removal step , the unreacted comonomer is easy to remain in the polymer, causing the polymer to stick together, the reactor fouling, etc., affecting the normal industrial production
[0004] Disclosed in Chinese patent CN1081684A is a method for preparing low-density polyethylene using a titanium-containing catalyst. Although the resulting polymer has good impact strength and narrow molecular weight distribution, the density of the polymer is still unsatisfactory

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Catalyst synthesis: Add 0.042 mol of anhydrous MgCl in a reactor fully replaced by high-purity nitrogen 2 , 50mL of toluene, 0.032mol of epichlorohydrin, 0.022mol of tributyl phosphate, 0.017mol of ethanol, 0.02mol of tetrahydrofuran, stirring and heating to 70℃ for 0.5 hours, then adding 0.0074mol of phthalic anhydride, maintaining for 1 hour, cooling down Add 0.5mol LTiCl dropwise to -25℃ 4 , Then slowly heated to 90°C, reacted for 1 hour, filtered, washed with toluene and hexane, and dried in vacuum to obtain a solid catalyst.

[0033] (2) Copolymerization of ethylene and 1-hexene: In a φ100 loop reactor with a volume of 75L, the molar ratio of 1-hexene to ethylene is 3.9, using triethylaluminum as a co-catalyst, and triethylaluminum The concentration in isobutane was 25 ppm, the hydrogen / ethylene (mole) was 0.03%, the polymerization temperature was 85°C, and the residence time was 1 hour. The results are shown in Table 1

Embodiment 2 and Embodiment 3

[0039] (1) Catalyst preparation: the same as in Example 1.

[0040] (2) Copolymerization of ethylene and 1-hexene: except the molar ratio of 1-hexene and ethylene is changed, the rest are the same

[0041] In Example 1, the polymerization results are shown in Table 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a kind of ethylene polymerization or co-polymerization method. The method contains the steps as follows: in ring-canal form reactor and condition of catalyst, proceed polymerization reaction with ethylene and more than a C3-C8 alpha-alkene slurry, and the catalyst mentioned above contains the reaction product of titanium catalyst constituent and organic aluminium compound. Ethylene and alpha-alkene combined polymer manufactured by the method has low density, and needs little quantity of comonomer. So it can make the residual comonomer in polymer quantity decline badly, which already had flash vaporization and renovation with diluent in ring-canal polymerization reaction industrial art, and can improve the quality of end combined polymer.

Description

Technical field [0001] The present invention relates to a method for polymerization or copolymerization of ethylene, and more specifically, to a method for slurry copolymerization of ethylene and α-olefin in a loop type polymerization reactor. Background technique [0002] As we all know, linear low-density polyethylene (LLDPE) has good chemical stability and electrical insulation, so it has been widely used, such as making films, wire and cable coating materials, injection molded parts, special molded parts, etc. product. Linear low-density polyethylene resin is a copolymer of ethylene and α-olefin. When the carbon number of α-olefin is higher, the performance of the copolymer is more ideal. Commercially successful products have been obtained, usually prepared by gas phase fluidized bed polymerization or slurry loop polymerization. The gas phase polymerization method can be used to obtain low-density and narrow-molecular-weight polymers, and such polymers are more suitable for t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/00C08F10/02
Inventor 陈伟金茂筑周俊领孙怡菁王毅邢宝泉朱宝兰马东程晓静张立伟
Owner CHINA PETROLEUM & CHEM CORP