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Methods and apparatus using refrigerant compositions comprising refrigerant and lubricant comprising perfluoropolyether and non-fluorinated lubricant

A non-fluorinated lubricant, perfluoropolyether technology, applied in the direction of lubricating compositions, chemical instruments and methods, heat exchange materials, etc., can solve problems such as unaware of the immiscibility of PFPE and non-fluorinated lubricants

Inactive Publication Date: 2016-03-02
THE CHEMOURS CO FC LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] U.S. Patent Application No. 2007-0187639A1 discloses the use of perfluoropolyether (PFPE) additives in refrigerants and refrigerant / lubricant mixtures to improve energy efficiency and oil return in vapor compression refrigeration and air conditioning systems, but also Also unaware of the immiscibility of PFPE with non-fluorinated lubricants

Method used

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  • Methods and apparatus using refrigerant compositions comprising refrigerant and lubricant comprising perfluoropolyether and non-fluorinated lubricant
  • Methods and apparatus using refrigerant compositions comprising refrigerant and lubricant comprising perfluoropolyether and non-fluorinated lubricant
  • Methods and apparatus using refrigerant compositions comprising refrigerant and lubricant comprising perfluoropolyether and non-fluorinated lubricant

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example

[0107] The concepts disclosed herein will be further described in the following examples, which do not limit the scope of the invention described in the claims.

[0108] The following material was used in the implementation examples;

[0109] PAGPSD1 is a polyalkylene glycol lubricant available from AC Delco, Grand Blanc, Michigan; POERL22H, POERL32H, and POERL68H are available from Nu-Calgon, St.Louis, Missouri. , Missouri)) with the trademark Polyol ester lubricants for sale; GPL104, GPL105, and GPL106 are non-functionalized perfluoropolyethers available from DuPont, Wilmington, Delaware; 157FS(L) is a functionalized perfluoropolyether from DuPont, Wilmington, Delaware; HFC-1234yf (2,3,3,3-tetrafluoropropene) refrigerant was obtained from DuPont of Wilmington.

example 1

[0111] Miscibility

[0112]The miscibility of the lubricant mixture in the presence of refrigerant was tested by the following method. The refrigerant and lubricant mixture compositions were loaded into sealed glass tubes at different concentrations of refrigerant and lubricant by volume. In most cases, HFO-1234yf refrigerant, one PFPE lubricant and one non-fluorinated lubricant were loaded into the tubes. The tubes were then subjected to different temperatures and the amount of phase present was visually observed. If one phase is observed, the refrigerant has achieved complete miscibility with both lubricants. If three phases are observed, miscibility has not been achieved between any of the phases. It is desirable to have one or two phases to show improved miscibility. The results are shown in Tables 1 to 12. Table 1 shows miscibility data for pure PAG with HFO-1234yf refrigerant. Table 2-4 shows the Miscibility data for 104 / PAG / 1234yf; Tables 5-8 show Miscibilit...

example 2

[0170] viscosity

[0171] In order to select a preferred PFPE lubricant to replace a PAG or POE lubricant, it is important to determine the viscosity of the refrigerant / lubricant mixture at compressor sump conditions during refrigeration or air conditioning operation. The gas liquid equilibrium, pressure and viscosity data of PAG and POE lubricants with HFO-1234yf were measured and compared with HFO-1234yf and different PFPE lubricants. The viscosity of the refrigerant-lubricant mixture was determined at typical compressor sump conditions of 20° C. and 0.35 MPa using a ViscoPro 2000 viscometer (Cambridge Applied Systems, Medford, Massachusetts, USA). Results are shown below.

[0172] Table 15

[0173]

[0174]

[0175] The data indicate that for PAGPSD1 the closest match in terms of viscosity is GPL104, both have a viscosity of 3cP. GPL-104 is also the best choice because it matches or slightly exceeds the viscosity of the POE lubricant being replaced, which is ...

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Abstract

Disclosed herein is a method to improve miscibility in refrigeration, air conditioning, heat pump or power cycle systems comprising charging a refrigeration, air conditioning or heat pump system with a refrigerant composition; wherein the refrigerant composition comprises at least one refrigerant and a lubricant comprising at least one perfluoropolyether and at least one non-fluorinated lubricant, provided that the refrigerant composition has no more than two liquid phases over the range of the composition and over a range of temperature from about -40C to about +60C. Also disclosed is a refrigeration, air conditioning, heat pump, or power cycle system containing said refrigerant composition.

Description

technical field [0001] The present invention relates to a method of improving the miscibility of refrigeration lubricants used in refrigeration, air conditioning, heat pump and power cycle equipment. Background technique [0002] There is a need for lubricants for use with new hydrofluorocarbon and hydrofluoroolefin refrigerants in refrigeration, air conditioning, heat pumps, power cycles and other applications. Blends of lubricants can provide properties that conventional lubricants such as polyol esters (POE), polyalkylene glycols (PAG) and mineral oils cannot. Fluorinated lubricants may in particular offer the ability to develop lubricant blends with reduced flammability. However, perfluoropolyethers have been found to be immiscible with non-fluorinated lubricants conventionally used in refrigeration and air conditioning systems. [0003] US Patent No. 5,221,494 discloses the use of perfluoropolyethers as lubricants in refrigeration systems using tetrafluoroethane refri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/04C10M171/00C10M111/00
CPCC09K5/044C09K5/045C09K2205/126C10M105/00C10M111/02C10M111/04C10M171/008C10M2203/1006C10M2205/0285C10M2205/223C10M2207/2835C10M2209/043C10M2209/1023C10M2209/1033C10M2213/04C10M2213/043C10M2215/24C10M2215/245C10M2215/26C10M2215/265C10M2217/0403C10M2219/0445C10M2229/02C10M2229/025C10N2020/02C10N2030/02C10N2040/30C10N2020/101C10N2030/70C09K2205/102C09K2205/112C10M107/38
Inventor B.H.米诺尔B.R.恩格勒T.J.莱克G.A.贝尔J.L.豪威尔K.康托马里斯
Owner THE CHEMOURS CO FC LLC
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