INFLUENCE OF SYNTHETIC ESTERS MOLECULAR STRUCTURE ON MUTUAL SOLUBILITY OF ESTERS AND REFRIGERANTS

Abstract

Abstract: The critical intersolubility temperatures of trimethylolpropane complex esters, pentaerythritol complex esters and dipentaerythritol esters with refrigerants (R22, R134a and R410A) were measured. Then the influences of polyhydric alcohol, binary acid and monoacid in complex esters on intersolubility of refrigerants were analyzed. Meanwhile, the effects of straight chain fatty acids and branched chain fatty acids in dipentaerythritol esters on solubility of refrigerants were also studied. Results showed that the intersolubilityof complex esters with refrigerants were mainly influenced by the basic molecular structure of the esters. The structural changes of polyhydric alcohols, binary acids and monoacids had no significant influence on solubility with R22, R134a and R410A. The basic molecular structure of dipentaerythritol ester is the decisive factor for excellent solubility with refrigerants. The dipentaerythritol ester containing more and longer straight chain fatty acids showed worse solubility with R134a. The more and the shorter branched chain fatty acids in dipentaerythritol ester, the lower the critical intersolubility temperature, and the stronger intersolubility with R134a.

Key words: complex ester, dipentaerythritol ester, refrigerant, molecular structure, critical solubility temperature

CLC Number:

References

[1] 陈美名，宗明．用于R134a和R22制冷系统的合成冷冻机油研究[J]．石油炼制与化工，2011，42（8）：69–73．
[2] Moises A, Marcelino N, Jader R B. Solubility, density and viscosity of a mixture of R-600a and polyol ester oil [J]. International journal of refrigeration, 2008, 31:34–44.
[3] 牛豫，王娟．L-DRB/A10全封闭冷冻机油的研制[J]．石油炼制与化工，2007，38（7）：54–59．
[4] 李雁秋，康茵，王鹏，等．冷冻机油对R600a型冰箱压缩机制冷性能的影响[J]．石油炼制与化工，2011，42（1）：80–83．
[5] 李涛，李强，阚杰，等．润滑油对制冷系统的影响[J]．制冷与空调，2005，5（4）：75–78．
[6] Zhelezny V P, Semenyuk Y V, Ancherbak S N, et al. An experimental investigation and modelling of the solubility, density and surface tension of 1,1,1,3,3-pentafluoropropane (R-245fa)/synthetic polyolester compressor oil solutions [J]. Journal of Fluorine Chemistry, 2007, 128:1029–1038.
[7] Wahlstrom A, Vamling L. Solubility of HFC32, HFC125, HFC134a, HFC143a, and HFC152a in a Pentaerythritol Tetrapentanoate Ester [J]. Journal of Chemical and Engineering Data, 1999, 44:823–828.
[8] 陈毓暑．新型R290制冷系统用酯类冷冻机油的合成与性能研究[D]．深圳:中国科学院深圳先进技术研究院，2014．
[9] 李雁秋，王鹏．新型环保冷冻机油的研制[J]．润滑油，2006，21（4）：5–10．
[10] 钱伟，王维，钱文波，等．替代制冷剂R134a、R290与润滑油的互溶性实验研究[J]．制冷与空调，2008，8（3）：31–35．
[11] Rostami S D, Thompson R I G. Statistical thermodynamic modeling of environmentally friendly refrigerant-lubricant mixture of R134a and an ISO 15 Polyol Ester [J]. Trans I Chem E, 2000, 78:87-90.
[12] 李玉平．与R134a相溶的冷冻机油的研制[J]．合成润滑材料，2015，32（2）：5–7．
[13] 费建奇，赵伟．多元醇酯类冷冻机油用基础油的合成及其性能[J]．润滑油，2009，24（4）：22–25．
[14] Wahlstrom A, Vamling L. Solubility of HFCs in Pentaerythritol Tetraalkyl Esters [J]. Journal of Chemical and Engineering Data, 2000, 45:97–103.
[15] Wahlstrom A, Vamling L. Development of models for prediction of solubility for HFC working fluids in pentaerythritol ester compressor oils [J]. International Journal of Refrigeration, 2000, 23:597–608.
[16] 谢泉，顾军惠，等．润滑油品研究与应用指南[M]．北京：中国石化出版社，2007：279–304．