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A lubricating oil composition and product technology, applied in lubricating compositions, petroleum industry, base materials, etc., can solve problems such as refrigerated lubricating oil leaving, insufficient amount of refrigerating lubricating oil, compressor failure, etc.
Inactive Publication Date: 2016-02-17
PATECH FINE CHEM
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Although an oil separator (Oilseparator) is usually installed at the outlet of the compressor to prevent the refrigeration lubricating oil from causing too much refrigeration lubricating oil to leave the compressor with the refrigerant due to the oil carryover phenomenon (Oilcarryover), resulting in insufficient refrigeration lubricating oil inside the compressor, and then A compressor failure has occurred
However, inevitably, there will still be a small amount of refrigeration lubricating oil leaving the compressor and eventually entering the evaporator with the refrigerant
In the low-temperature environment of the evaporator, the miscibility between the refrigerant lubricating oil and the refrigerant will become poor. If phase separation occurs due to insufficient mutual solubility at this time, the refrigerant lubricating oil will accumulate on the surface of the evaporator and cannot return to the compressor. Therefore, it will not only affect the heat transfer efficiency of the refrigerant in the evaporator, but more seriously, it will lead to insufficient refrigeration lubricating oil in the compressor, resulting in compressor failure
Method used
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[0046] The synthesis method of the polyol ester product (POE) of the present invention comprises an esterification step and a purification step.
[0047] Esterification step: an appropriate amount of one or more linear or branched saturated or unsaturated C 4-20 The fatty acid is reacted with one, two or three polyols selected from tripentaerythritol, dipentaerythritol or pentaerythritol in the presence (or absence) of a catalyst. Depending on the starting material and catalyst, the reaction temperature is about 150 to 250°C, preferably 180 to 240°C, more preferably 200 to 230°C, until the hydroxyl value is lower than 10mgKOH / g, preferably 5mgKOH / g g or less, more preferably 3 mgKOH / g or less.
[0048] Commonly used catalysts include stannous oxalate, stannous oxide, tetrabutyl titanate, tripropyl titanate or methanesulfonic acid.
[0049] Purification steps:
[0050] Moisture removal: Dry the system under high vacuum to remove moisture to below 50ppm.
[0051] Removal of ...
Embodiment 1
[0073] Embodiment 1.TriPE+(iC9, MBA, nC5)
[0074] Raw material: tripentaerythritol (TriPE), and fatty acid: isoC9 (3,5,5-trimethylhexanoic acid)+MBA (2-methylbutyric acid)+nC5 (n-valeric acid) (wt%=25%: 60 %: 15%)
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Abstract
The invention provides a refrigeration lubricating oil composition. The composition comprises polyol ester products obtained after reaction of tripentaerythritol, dipentaerythritol, pentaerythritol or a mixture of tripentaerythritol, dipentaerythritol and pentaerythritol with one or more straight-chain / branched-chain saturated / nonsaturated C4-20 aliphatic acid; or the composition comprises a mixture of polyol ester products obtained after reaction of tripentaerythritol with one or more straight-chain / branched-chain saturated / nonsaturated C4-20 aliphatic acid, polyol ester products obtained after reaction of dipentaerythritol with one or more straight-chain / branched-chain saturated / nonsaturated C4-20 aliphatic acid or polyol ester products obtained after reaction of pentaerythritol with one or more straight-chain / branched-chain saturated / nonsaturated C4-20 aliphatic acid. The polyol ester products have the following properties: intermiscible temperature of the polyol ester products and a refrigerant (such as a hydrofluorocarbon refrigerant and a hydrofluoroolefin refrigerant) is lower than -25 DEG C (with 20% of polyol esters in the refrigerant); the dynamic viscosity of the polyol ester products at a temperature of 40 DEG C is in a range of 46 to 460 cSt; and the polyol ester products show high operation viscosity in testing under related standard compressor conditions.
Description
technical field [0001] The present invention relates to a refrigeration lubricating oil composition, which comprises tripentaerythritol (TriPE), dipentaerythritol (DiPE), pentaerythritol (PE) or a mixture thereof and one or more linear or branched saturated or unsaturated C 4-20 Polyol ester products (polyol-ester (POE)) obtained by the reaction of fatty acids, or tripentaerythritol (TriPE) and one or more linear or branched saturated or unsaturated C 4-20 Polyol ester products obtained by the reaction of fatty acids, dipentaerythritol (DiPE) and one or more linear or branched saturated or unsaturated C 4-20 Polyol ester products obtained by fatty acid reaction or pentaerythritol (PE) and one or more linear or branched saturated or unsaturated C 4-20 A mixture of polyol ester products obtained by the reaction of fatty acids. The polyol ester product (POE) has the following properties: The mutual solubility temperature is lower than -25°C (20% polyol esters in the refrigerant...
Claims
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Application Information
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