Lubricant compositions for improved high pressure free-radical polymerizations

Patent metadata

Field	Value
Publication number	US-10144898-B2
Application number	US-201515521663-A
Country	US
Kind code	B2
Filing date	Nov 12, 2015
Priority date	Nov 13, 2014
Publication date	Dec 4, 2018
Grant date	Dec 4, 2018

Abstract

The invention provides a composition comprising at least the following: an oil, and at least one compound selected from Compounds 1 through 3, or a combination thereof, as described herein. The composition can be used to improve the high pressure, free-radical polymerizations of ethylene-based interpolymers, and to reduce polymer build-up in reciprocation devices throughout the process.

First claim

The invention claimed is:

1. A composition comprising at least the following:
A) an oil, and
B) at least one compound selected from the following compounds i) through iii):

wherein, for Compound 1, R1, R2, R3, R4, R5, R6, R7 and R8 are each independently selected from H, an alkyl, or an alkoxy;

wherein, for Compound 2, R1 is selected from OH or O—R, wherein R is alkyl; and R2, R3, R4 and R5 are each independently selected from H, an alkyl, or an alkoxy; or
iii) a combination of Compounds 1 through 2; and
wherein the composition comprises less than, or equal to, 1.0 weight percent (based on the weight of the composition) of a non-aromatic polar compound, excluding alcohols, and other than Compound 2 above, and wherein the non-aromatic compound has a Dipole Moment greater than, or equal to, 1.00 Debye; and
wherein component B is present in an amount from 5 to 100 ppm, based on the weight of the composition.

2. The composition of claim 1 , wherein the oil and compound comprise greater than, or equal to, 99.0 weight percent of the composition, based on the weight of the composition.

3. The composition of claim 1 , wherein the compound is selected from:

or d) a combination thereof.

4. The composition of claim 1 , wherein the at least one compound is present in an amount from 5 to 100 ppm, based on the weight of the oil.

5. The composition of claim 1 , wherein the at least one compound is selected from Compound 1:

wherein, for Compound 1, R1, R2, R3, R4, R5, R6, R7 and R8 are each independently selected from H, an alkyl, or an alkoxy.

6. A process to prepare an ethylene-based interpolymer, said process comprising polymerizing a mixture comprising ethylene and at least one comonomer containing acid and/or ester groups, at a pressure greater than, or equal to, 100 MPa, in the presence of at least one free-radical initiator; and in a reactor system comprising at least one reactor and at least one component selected from the following:
a) a reciprocation device,
b) a rotation device,
c) or combination thereof; and

wherein the composition of claim 1 is injected into the at least one component.

7. The process of claim 6 , wherein, during the polymerization, the composition is continually injected into the at least one component.

8. The process of claim 6 , wherein the at least one component is a reciprocation device.

9. The process of claim 8 , wherein the reciprocation device is a Hyper-compressor.

10. The process of claim 9 , wherein the discharge pressure in the Hyper-compressor is from 100 MPa to 400 MPa.

11. The process of claim 9 , wherein the composition is injected at one or more injection points into the Hyper-compressor.

12. The process of claim 6 , wherein the comonomer is selected from acrylic acid, ethylene acrylate, or a combination thereof.

13. A process to reduce polymer build-up in a reciprocation device and/or rotational device, used in the polymerization of a mixture comprising ethylene and at least one comonomer containing acid and/or ester groups, said process comprising injecting the composition of claim 1 into the reciprocation device and/or rotational device.

14. The process of claim 13 , wherein, during the polymerization, the composition is continually injected into the reciprocation device and/or rotational device.

15. The process of claim 14 , wherein the composition is injected at a rate of 2 to 150 lbs/hr.

16. The process of claim 13 , wherein the composition is injected into a reciprocation device.

17. The process of claim 16 , wherein the reciprocation device is a Hyper-compressor.

18. The process of claim 17 , wherein the composition is injected at one or more injection points into the Hyper-compressor.

19. The process of claim 13 , wherein the comonomer is selected from acrylic acid, ethylene acrylate, or a combination thereof.

Assignees

• Dow Global Technologies Llc

Inventors

• Gutermuth Bryan
• Ewart Sean W
• Bradley Jeffery S
• Berbee Otto J

Classifications

• C10N2040/30

  Refrigerators lubricants {or compressors lubricants} · CPC title

• C08F2/00

  Processes of polymerisation · CPC title

• C08F210/02

  Ethene · CPC title

• C08F120/06

  Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof · CPC title

• C10M2207/023

  having hydroxy groups bound to carbon atoms of six-membered aromatic rings · CPC title