Working Fluids Comprising Fluorinated Olefins / Fluorinated Saturated Hydrocarbon Blends and Polyol Esters

Patent metadata

Field	Value
Publication number	US-2016009974-A1
Application number	US-201514795948-A
Country	US
Kind code	A1
Filing date	Jul 10, 2015
Priority date	Jul 14, 2014
Publication date	Jan 14, 2016
Grant date	—

Abstract

Working fluids comprising a refrigerant blend comprising a fluorinated alkane and a fluorinated olefin refrigerant, and a polyol ester lubricant composition comprising a mixture of alkylcarboxy esters of mono-pentaerythritol, di-pentaerythritol, tri-pentaerythritol and pentaerythritol oligomers, wherein at least 10 wt % of all polyol esters are esters of pentaerythritol oligomers of 4 or more pentaerythritol monomer groups.

First claim

What is claimed:

1 . A working fluid comprising:
i) a refrigerant blend comprising from 80 to 60% by weight, based on the weight of the refrigerant blend, of fluorinated alkane and from 20 to 40% by weight of a fluorinated olefin, and ii) a polyol ester lubricant composition having a kinematic viscosity at 40° C. of from 32 to 120 cSt and a kinematic viscosity at 100° C. of from 5 to 20 cSt, comprising:
a) from about 30 to about 85 wt % C 5-10 alkylcarboxy esters of pentaerythritol,
b) from about 1 to about 20 wt % C 5-10 alkylcarboxy esters of di-pentaerythritol,
c) from about 1 to about 10 wt % C 5-10 alkylcarboxy esters of tri-pentaerythritol, and
d) from about 10 to about 45 wt % C 5-10 alkylcarboxy esters of pentaerythritol oligomers of 4 or more pentaerythritol monomer groups, based on the weight of all polyol esters in the lubricant, and wherein 60 mole % or more of all the C 5-10 alkylcarboxy esters are linear or branched C 5 alkylcarboxy esters, and 20-60% of the C 5-10 alkylcarboxy esters are branched.

2 . The working fluid according to claim 1 wherein the polyol ester lubricant composition has a kinematic viscosity at 40° C. of from 40 to 140 cSt.

3 . The working fluid according to claim 1 wherein the polyol ester lubricant composition comprises:
a) from about 30 to about 55 wt % C 5-10 alkylcarboxy esters of pentaerythritol,
b) from about 1 to about 20 wt % C 5-10 alkylcarboxy esters of di-pentaerythritol,
c) from about 1 to about 10 wt % C 5-10 alkylcarboxy esters of tri pentaerythritol, and
d) from about 25 to about 45 wt % C 5-10 alkylcarboxy esters of pentaerythritol oligomers of 4 or more pentaerythritol monomer groups.

4 . The working fluid according to claim 1 wherein 75 mol % or more of all alkylcarboxy esters are linear or branched C 5 alkylcarboxy esters.

5 . The working fluid according to claim 1 wherein 25 to 55% of the C 5-10 alkylcarboxy esters are branched.

6 . The working fluid according to claim 1 wherein the a refrigerant blend comprises from 70 to 75% by weight of fluorinated alkane and from 25 to 30% by weight of a fluorinated olefin hydrofluorocarbon refrigerant.

7 . The working fluid according to claim 1 wherein the refrigerant blend comprises a hydrofluoro alkane and a hydrofluoro olefin, which a hydrofluoro olefin has 3, 4 or 5 carbon atoms.

8 . The working fluid according to claim 7 wherein the hydrofluoro alkane comprises difluoromethane (R-32), 1,1,1,2-tetrafluoroethane (R-134a), 1,1,2,2-tetrafluoroethane (R-134), pentafluoroethane (R-125), or 1,1,1-trifluoroethane (R-143a).

9 . The working fluid according to claim 7 wherein the hydrofluoro olefin comprises a polyflourinated propene.

10 . The working fluid according to claim 8 wherein the hydrofluoro olefin comprises a polyflourinated propene.

Assignees

• Chemtura Corp

Inventors

• Benanti Travis
• Hessell Edward T
• Urrego Roberto

Classifications

• C10N2030/02

  Pour-point; Viscosity index · CPC title

• C10N2020/069

  Linear chain compounds · CPC title

• C10N2040/30

  Refrigerators lubricants {or compressors lubricants} · CPC title

• C10N2030/06

  Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure · CPC title

• C10N2020/071

  Branched chain compounds · CPC title