Process for polymerisation of ethylene

Patent metadata

Field	Value
Publication number	US-9617355-B2
Application number	US-201113877558-A
Country	US
Kind code	B2
Filing date	Oct 4, 2011
Priority date	Oct 7, 2010
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

The present invention is directed to a process for the production of high density polyethylene by polymerisation of ethylene in the presence of a supported chromium oxide based catalyst which is modified with an organic compound comprising oxygen and a nitrogen atom which is selected from the group consisting of saturated heterocyclic organic compounds with a five or six membered ring, amino esters and amino alcohols. Such organic compounds allow manufacturing of HDPE with increases molecular weight distribution and increased molecular weight.

First claim

The invention claimed is:

1. A process for the production of high density polyethylene by polymerizing ethylene in the presence of a supported chromium oxide-based catalyst that is modified with an organic compound comprising an oxygen and a nitrogen atom, wherein the organic compound is an amino alcohol,
wherein the amino alcohol has the formula:

wherein each R, independently the same or different, is a C 1 -C 8 alkyl group, a C 6 -C 10 aryl group, a C 1 -C 8 cycloalkyl group, or a trifluoromethyl group, and
R 1 is a C 1 -C 8 alkyl group, a C 3 -C 8 cycloalkyl group, a C 6 -C 10 aryl group or a C 4 -C 16 alkyl substituted cycloalkyl group.

2. The process according to claim 1 , wherein the amino alcohol is 4-(cyclohexylamino) pentan-2-ol, 4-(methylamino)pentan-2-ol, 4-(phenylamino)pentan-2-ol, 4-(isopropylamino)pentan-2-ol, 3-(methylamino)-1-phenylbutan-1-ol, 1,1,1-trifluromethyl-4-(methylamino) pentan-2-ol and/or 4-[(2-methylcyclohexyl)amino]pentan-2-ol.

3. The process according to claim 1 , wherein the molar ratio of chromium to amino alcohol ranges between 1: 0.05 and 1:3.

4. The process according to claim 1 , wherein the supported chromium oxide based catalyst is modified with a mixture of the amino alcohol and an organoaluminum compound having the formula R l n AlX 3-n , wherein R l represents an alkyl group having from 1 to 10 carbon atoms, X represents a halogen atom and 1≦n≦3.

5. The process according to claim 4 , wherein the molar ratio of chromium to aluminium ranges between 1:0.1 and 1:1.

6. The process according to claim 1 , wherein the process is a slurry process.

Assignees

• Aliyev Vugar O
• Headan Ali Saad
• Sainani Jaiprakash Brijal
• Saudi Basic Ind Corp

Inventors

• Aliyev Vugar O
• Headan Ali Saad
• Sainani Jaiprakash Brijal

Classifications

• C08F10/02 Primary

  Ethene · CPC title

• C08F2500/07

  High density, i.e. > 0.95 g/cm3 · CPC title

• C08F110/02 Primary

  Ethene · CPC title

• C08F4/24

  Oxides · CPC title

• C08F4/69

  Chromium, molybdenum, tungsten or compounds thereof · CPC title