Thomas E Rajewski

US Patent:

6374629, Apr 23, 2002

Filed:

Jan 25, 1999

Appl. No.:

09/236707

Inventors:

Jill Ellen Oberle - Brant MI
Thomas Edward Rajewski - Bay City MI

Assignee:

The Lubrizol Corporation - Wickliffe OH

International Classification:

F25B 4302

US Classification:

62473, 62471, 62502, 62192, 252 68

Abstract:

A lubricant-refrigerant composition contained within a compression refrigeration system is disclosed which comprises (A) at least one fluorine-containing hydrocarbon refrigerant containing 1 to 3 carbon atoms, further wherein fluorine is the only halogen in said fluorine-containing hydrocarbon with the proviso that 1,1,1,2-tetrafluoroethane is not the sole refrigerant; and (B) at least one lubricant comprising (1) a hydrocarbyl substituted arene, (2) a phosphate ester, (3) an organic ester of a carboxylic acid and an alcohol, (4) a perfluoropolyethylene, (5) an ether; (6) a polyether; (7) a polyalphaolefin; or (8) a mineral oil; wherein at a temperature of above -60Â C. a phase separation occurs such that at least two phases are formed, said phases being a refrigerant rich phase and a lubricant rich phase, further wherein the lubricant rich phase resides below the refrigerant rich phase.

US Patent:

6677284, Jan 13, 2004

Filed:

Aug 29, 2002

Appl. No.:

10/220460

Inventors:

Thomas Rajewski - Auburn MI
John C. Tolfa - Midland MI
Hsinheng Li - Mt. Pleasant MI

Assignee:

The Lubrizol Corporation - Wickliffe OH

International Classification:

C10M14536

US Classification:

508579, 252 68

Abstract:

A problem with refrigeration systems using ammonia as the refrigerant and hydrocarbon lubricants is that the seals/gaskets of the systems have a tendency to harden and shrink. This can cause leakage of the refrigerant and eventually require disassembly of the equipment and replacement of the seals. The addition of a small amount polyether having an aromatic fragment of 6-18 carbon atoms or an aliphatic fragment of 10-22 carbon atoms can soften the seals and partially re-swell the seals solving the leakage problem and avoiding expensive maintenance costs. Alternatively a polyether of 1,2-butylene oxide which is more oil soluble than most other polyethers with a smaller Z group e. g. derived from alkanols of 1 to 9 carbon would be effective at reducing hardening and shrinkage.

US Patent:

20060166843, Jul 27, 2006

Filed:

Oct 1, 2003

Appl. No.:

10/529955

Inventors:

Thomas Rajewski - Auburn MI, US
Kenneth Lilje - Midland MI, US
John Tolfa - Midland MI, US

International Classification:

C10L 1/14

US Classification:

508459000

Abstract:

Polymeric additives are disclosed for compressor lubricants which can reduce the tendency of the lubricant to become entrained in compressed gases and be carried forward as fine dispersed droplets in compressed gas systems such as compressed air, natural gas, and compression refrigeration systems.

US Patent:

62679074, Jul 31, 2001

Filed:

Jun 3, 1999

Appl. No.:

9/325136

Inventors:

John C. Tolfa - Midland MI
Thomas E. Rajewski - Bay City MI

Assignee:

The Lubrizol Corporation - Wickliffe OH

International Classification:

C09K 504

US Classification:

252 68

Abstract:

A lubricant-refrigerant composition for a compression refrigeration system is disclosed which comprises (A) carbon dioxide refrigerant, and (B) a lubricant of an aliphatic naphthalene. A supplemental lubricant comprising at least one alkyl benzene, a hydrocarbon, a polyalkylene glycol, a polyol ester or a polyvinyl ether may also be present. Additionally, a performance additive comprising an alkoxylated alcohol or phenol, an alkoxylated glycol, an alkyl phenol or a phosphorus compound may also be present.

US Patent:

55956785, Jan 21, 1997

Filed:

Aug 30, 1994

Appl. No.:

8/298342

Inventors:

Glenn D. Short - Midland MI
Lars I. Sj oholm - Burnsville MN
Thomas E. Rajewski - Bay City MI

Assignee:

CPI Engineering Services, Inc. - Midland MI

International Classification:

C10M14526
C10M14534

US Classification:

252 68

Abstract:

A fluid composition of suitable miscibility and solubility in ammonia, chlorofluorocarbon, hydrochlorofluorocarbon, and hydrofluorocarbon refrigerants includes and a refrigerant selected from the group consisting essentially of ammonia, chlorofluorocarbons, hydrochlorofluorocarbons, and hydrofluorocarbon refrigerants and a lubricant composition made with an organic oxide and an alcohol and comprises a polyalkylene glycol of the formula: Z--((CH. sub. 2 --CH(R. sub. 1)--O). sub. n --(CH. sub. 2 --CH(R. sub. 1)--O--). sub. m). sub. p --H wherein Z is a residue of a compound having 1-8 active hydrogens and a minimum number of carbon atoms of six (6) carbons where Z is an aryl group and a minimum number of carbon atoms of ten (10) where Z is an alkyl group, R. sub. 1 is hydrogen, methyl, ethyl, or a mixture thereof, N is 0 or a positive number, M is a positive number, and P is an integer having a value equal to the number of active hydrogen of Z.