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Pentaerythritol ester base oil and preparation method thereof

A technology of pentaerythritol ester and pentaerythritol, which is applied in the field of preparation of pentaerythritol ester base oil, can solve the problems of poor compatibility, esterification process to be optimized, long esterification reaction time, etc., achieve good compatibility, optimize esterification process, The effect of shortening the reaction time of esterification

Active Publication Date: 2021-07-27
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current mainstream polyol ester base oil has poor compatibility with R32, and there are technical problems such as the esterification process needs to be optimized and the esterification reaction time is long.

Method used

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  • Pentaerythritol ester base oil and preparation method thereof

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preparation example Construction

[0021] The invention provides a kind of preparation method of pentaerythritol ester base oil, comprises the following steps:

[0022] a) mixing isooctanoic acid and pentaerythritol to obtain a mixture;

[0023] b) adding a catalyst to the mixture obtained in step a) to carry out the first esterification reaction; adding fatty acid to carry out the second esterification reaction to obtain pentaerythritol crude esters, which are refined to obtain pentaerythritol ester base oils.

[0024] In the present invention, firstly, isooctanoic acid and pentaerythritol are mixed to obtain a mixture. In the present invention, the isooctanoic acid and pentaerythritol can be obtained from commercial sources well known to those skilled in the art. In the present invention, the molar ratio of isooctanoic acid to pentaerythritol is preferably (1.5-3.5):1, more preferably (2-3):1.

[0025] In the present invention, the process of said mixing is preferably specifically:

[0026] Under the condi...

Embodiment 1

[0048] Under the condition of stirring at a rotating speed of 100r / min, mix isooctanoic acid and pentaerythritol with a molar ratio of 2:1 in the reactor, then heat up to 90°C and keep it for 1h to obtain the mixture; then add 0.15% (wt) of the above mixture The sulfur-based catalyst produced by Yucheng Chemical Co., Ltd. carries out the esterification reaction at 200°C, and the reaction time is 3 hours; when the water output of one-step esterification reaches the theoretical water output, it means that the one-step esterification reaction is complete; when the temperature is lowered to below 120°C, Add isovaleric acid, the molar ratio of which to pentaerythritol is 2.2:1, and continue the esterification reaction at 200°C for 5 hours to obtain crude pentaerythritol ester, which is refined to obtain pentaerythritol ester base oil.

Embodiment 2

[0050] Under the condition of stirring at a rotating speed of 100r / min, mix isooctanoic acid and pentaerythritol with a molar ratio of 2:1 in the reactor, then heat up to 90°C and keep it for 1h to obtain the mixture; then add 0.15% (wt) of the above mixture The sulfur-based catalyst produced by Yucheng Chemical Co., Ltd. carries out the esterification reaction at 200°C, and the reaction time is 3 hours; when the water output of one-step esterification reaches the theoretical water output, it means that the one-step esterification reaction is complete; when the temperature is lowered to below 120°C, Add isononanoic acid, the molar ratio of which to pentaerythritol is 2.2:1, and continue the esterification reaction at 200°C for 5 hours to obtain crude pentaerythritol ester, which is refined to obtain pentaerythritol ester base oil.

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Abstract

The invention provides a pentaerythritol ester base oil and a preparation method thereof. The preparation method comprises the following steps: a) mixing isocaprylic acid and pentaerythritol to obtain a mixture; and b) adding a catalyst into the mixture obtained in the step a), carrying out primary esterification reaction, supplementing fatty acid to carry out second esterification reaction to obtain pentaerythritol crude ester, and refining to obtain the pentaerythritol ester base oil. Compared with the prior art, the preparation method provided by the invention adopts specific raw materials, and the pentaerythritol ester base oil is prepared under specific steps and conditions; and according to the preparation method, the esterification process is optimized, the esterification reaction time can be shortened, and meanwhile, the prepared pentaerythritol ester base oil has good compatibility with a refrigerant on the basis that various properties are good.

Description

technical field [0001] The invention relates to the technical field of household refrigeration of refrigerating machine oil, and more specifically relates to a preparation method of pentaerythritol ester base oil. Background technique [0002] Pentaerythritol ester base oil has excellent lubricating properties, high viscosity index, good chemical stability, and good compatibility with refrigerants, so it is an ideal base oil for refrigerating machine oil. At present, the field of household refrigeration has basically developed from R22 to R410a and R32. In 2019, the share of R410a and R32 in the household air conditioner market is about 80%. Among them, R32 refrigerant is one of the lowest cost and most widely used refrigerants. It is considered to be one of the next-generation environmentally friendly refrigerants with the greatest applicability. However, the current mainstream polyol ester base oil has poor compatibility with R32, and there are technical problems such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C69/33C10M105/38
CPCC07C67/08C10M105/38C10M2207/2835C07C69/33Y02P20/10Y02P20/584
Inventor 余秋兰马楷梅莉刘月皞吴旭东
Owner CHINA PETROLEUM & CHEM CORP
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