Ethylene polymerization method and polyethylene

A technology of ethylene polymerization and polymerization reaction, which is applied in the field of polyethylene, can solve the problems of poor thermal stability and hydrothermal stability, low ethylene polymerization activity, and affecting loading effect, etc., achieve stable mesopore structure, improve fluidity, and facilitate application Effect

Active Publication Date: 2018-10-09
CHINA PETROLEUM & CHEM CORP +1
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason for the low ethylene polymerization activity of the mesoporous material MCM-41 after loading the catalyst is that the thermal and hydrothermal stability of the pore wall structure of MCM-41 is poor, and the pore wall partially collapses during the loading process, which affects the loading. effect, so that it affects the catalytic activity

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Ethylene polymerization method and polyethylene
  • Ethylene polymerization method and polyethylene
  • Ethylene polymerization method and polyethylene

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] In a preferred case, the preparation method of the catalyst may include: contacting the spherical mesoporous composite material with a mother liquor containing magnesium salt and / or titanium salt in the presence of an inert gas.

[0029] Preferably, the contacting conditions include: a temperature of 25-100° C., preferably 40-60° C.; a time of 0.1-5 h, preferably 1-3 h.

[0030] The mother liquor that contains magnesium salt and / or titanium salt can be the organic solvent that contains magnesium salt and / or titanium salt, and described organic solvent can be Virahol and tetrahydrofuran, and the volume ratio of tetrahydrofuran and Virahol can be 1: 1-3, preferably 1:1-1.5.

[0031] During the preparation of the catalyst, the amount of the magnesium salt and / or the titanium salt is preferably in excess relative to the spherical mesoporous composite material. More preferably, the amount of the magnesium salt, the titanium salt and the spherical mesoporous composite materi...

Embodiment approach

[0052] According to a preferred embodiment of the present invention, the process of the first mixed contact includes: (1) cetyltrimethylammonium bromide (CTAB), polyethylene glycol octylphenyl ether (Trilar General X-100) and hydrochloric acid at 25-60°C until dissolved; (2) Stir the solution obtained in step (1) and silicate at 25-60°C for 10-72 hours, and let stand for 10-72 hours Hour.

[0053] In the present invention, the conditions for the crystallization are not particularly limited, and may be selected conventionally in the art. For example, the crystallization conditions include: the temperature may be 25-60° C., preferably 30-50° C.; the time may be 10-40 hours, preferably 15-35 hours. According to a preferred embodiment, the crystallization is carried out by hydrothermal crystallization.

[0054] In the present invention, in the above-mentioned process of preparing the filter cake of the mesoporous molecular sieve material, the process of obtaining the filter cake...

Embodiment 1

[0089] This example is used to illustrate the ethylene polymerization method and the obtained polyethylene of the present invention.

[0090] (1) Preparation of spherical mesoporous composites

[0091] 1.5 grams of CTAB (cetyltrimethylammonium bromide) and 1.5 ml of polyethylene glycol octylphenyl ether (Triton-X100) were added to 29.6 grams of 37% by weight of concentrated hydrochloric acid and 75 grams of In hydrochloric acid composed of water, mix and stir at 40°C until CTAB is completely dissolved; then add 4.35 grams of tetraethyl orthosilicate to the above solution, and stir for 15 hours at 40°C with a mechanical stirring rate of 340r / min , standing at 40° C. for 24 hours; the resulting solution was transferred to a polytetrafluoroethylene-lined reactor, crystallized at 50° C. for 24 hours, filtered and washed to obtain a mesoporous material filter cake A1.

[0092] The water glass with a concentration of 15% by weight and the sulfuric acid solution and glycerin with a ...

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

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
specific surface areaaaaaaaaaaa
specific surface areaaaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for polymerizing ethylene and polyethylene prepared by using the method, belonging to the field of polymerization. Ethylene is subjected to a polymerization reaction in the presence of a catalyst under polymerization conditions, wherein the catalyst contains a spherical mesoporous composite material and a magnesium salt and / or a titanium salt loaded on the spherical mesoporous composite material. The spherical mesoporous composite material has an average particle size of 20-30 micrometers, a specific surface area of 100-300 square meters / gram and a pore volume of 0.5-1.8 ml / gram; and the pore diameters of the spherical mesoporous composite material are in the form of bimodal distribution, and the most probable pore diameters corresponding to double peaksare 1-10 nm and 20-55 nm, respectively. According to the method, the supported catalyst with a stable mesoporous structure is utilized, and the prepared polyethylene is low in bulk density and melt index and not prone to fragmentation.

Description

technical field [0001] The invention relates to the field of polymerization reaction, in particular to a method for ethylene polymerization and polyethylene prepared by the method. Background technique [0002] Since Mobile’s synthetic mesoporous materials with highly ordered pores have been synthesized in 1992, due to their high specific surface area, regular pore structure and narrow pore size distribution, mesoporous materials have been widely used in the fields of catalysis, separation, and medicine. Great attention. In 1998, Zhao Dongyuan and others synthesized a new type of material - mesoporous material SBA-15, which has highly ordered pore size (6-30nm), large pore volume (1.0cm 3 / g), thicker pore wall (4-6nm), high mechanical strength and good catalytic adsorption performance (see D.Y.Zhao, J.L.Feng, Q.S.Huo, et al Science 279 (1998) 548-550). CN1341553A discloses a method for preparing a mesoporous molecular sieve carrier material. The mesoporous material prepar...

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): C08F110/02C08F4/02C08F4/645
CPCC08F110/02C08F4/02C08F4/645C08F2500/12C08F2500/18
Inventor 亢宇张明森吕新平周俊岭徐世媛张志会
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap