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A kind of refining method of polyol ester crude product

A technology of polyol ester and refining method, which is applied to the preparation of carboxylic acid ester, chemical instruments and methods, and the preparation of organic compounds, etc., which can solve the problem of not meeting the quality requirements of synthetic refrigerator lubricating oil base oil and the yield of refined ester products low, waste lye polluting the environment and other issues, to achieve the effects of short heating time, intact molecular structure, and short operating time

Active Publication Date: 2021-07-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Vacuum distillation removes the non-ideal components of the crude polyol ester through low-vacuum vacuum distillation. Although it is simple and easy, the removal efficiency is low and cannot meet the quality requirements of synthetic refrigerator lubricating oil base oils.
The method of vacuum distillation combined with alkali elution to remove acid is further washed with alkali solution, and the free fatty acid and acid catalyst impurities in the product are removed through neutralization reaction. Although it has a certain deacidification effect, there are ester oil hydrolysis and water content. Excess standard, introduction of metal impurities, low yield of refined ester products, etc., and the waste lye produced has environmental pollution problems; the solid adsorption deacidification and decolorization method uses adsorbents to absorb decolorization and deacidification, although it has certain deacidification and decolorization effects , but the yield of its refined ester product is low

Method used

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  • A kind of refining method of polyol ester crude product

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Embodiment 1

[0036] In this embodiment, the esterification product generated by the esterification reaction of pentaerythritol and isooctanoic acid under the action of a catalyst is used as the crude polyol ester raw material; the process flow of the refining method is as follows figure 1 As shown, the refining steps are as follows:

[0037] 1. Primary molecular distillation

[0038] Add 1L of the raw material of the above-mentioned polyol ester crude product to a primary molecular distillation device (such as a primary molecular distillation apparatus) to carry out primary molecular distillation, wherein the temperature of the primary molecular distillation is controlled to be 170° C., and the absolute pressure is 10 Pa, so that the multiple Moisture, catalysts with lower boiling points and unreacted isooctanoic acid in the crude alcohol ester raw material are removed.

[0039] 2. Secondary molecular distillation

[0040] The heavy component obtained by the primary molecular distillatio...

Embodiment 2

[0047] In this embodiment, the esterification product generated by the esterification reaction of pentaerythritol and isooctanoic acid under the action of a catalyst is used as the crude polyol ester raw material, and the refining steps are as follows:

[0048] 1. Primary molecular distillation

[0049] Add 1L of the above crude polyol ester raw material to primary molecular distillation equipment for primary molecular distillation, wherein the temperature of the primary molecular distillation is controlled to be 180° C., and the absolute pressure is 1 Pa, so that the moisture in the crude polyol ester raw material, Catalysts with lower boiling points and unreacted isooctanoic acid are removed.

[0050] 2. Secondary molecular distillation

[0051] Add the heavy component obtained from the primary molecular distillation to the secondary molecular distillation equipment for secondary molecular distillation, wherein the temperature of the secondary molecular distillation is cont...

Embodiment 3

[0058] In this embodiment, the esterification product generated by the esterification reaction of pentaerythritol and isooctanoic acid under the action of a catalyst is used as the crude polyol ester raw material, and the refining steps are as follows:

[0059] 1. Primary molecular distillation

[0060] Add 1L of the above crude polyol ester raw material to primary molecular distillation equipment for primary molecular distillation, wherein the temperature of the primary molecular distillation is controlled to be 175° C., and the absolute pressure is 5 Pa, so that the moisture in the crude polyol ester raw material, Catalysts with lower boiling points and unreacted isooctanoic acid are removed.

[0061] 2. Secondary molecular distillation

[0062] Add the heavy component obtained from the primary molecular distillation to the secondary molecular distillation equipment for secondary molecular distillation, wherein the temperature of the secondary molecular distillation is cont...

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Abstract

The invention provides a method for refining polyol ester crude products. The method for refining polyol ester crude product of the present invention comprises the following steps: 1) carrying out primary molecular distillation and secondary molecular distillation sequentially to polyol ester crude product; 2) carrying out nitrogen gas stripping to the product after secondary molecular distillation to obtain refined Polyol ester products; wherein, the temperature of the controlled secondary molecular distillation is higher than the temperature of the primary molecular distillation, and / or the absolute pressure of the secondary molecular distillation is lower than the absolute pressure of the primary molecular distillation. The refining method of the invention has the advantages of high production efficiency, low refining cost, and environmental protection. The acid value, water content and chroma of the polyol ester product refined by the method can all meet the requirements of the refined ester product, and the product yield is high.

Description

technical field [0001] The invention belongs to the technical field of chemical fine separation, and in particular relates to a method for refining crude polyol esters. Background technique [0002] Synthetic lubricating oil base oil is an organic liquid lubricating oil base oil obtained by chemical synthesis, which can be made into synthetic lubricating oil after adding various additives. Ester oil is a kind of synthetic lubricating oil with better comprehensive performance and earlier development and application, which can be divided into diester, polyol ester and double ester. With the development of modern industry and the increasing requirements of environmental protection, ester lubricating oil has been more and more widely used because of its unique high and low temperature performance, viscosity-temperature performance, lubricating performance and biodegradable performance. At present, ester oil has been widely used in aerospace, military, automobile, petrochemical,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C67/54C07C69/33C07C69/003
CPCC07C67/54C07C69/33C07C69/003
Inventor 李磊马玲地力拜·马力克牛春革白生军朱建华
Owner PETROCHINA CO LTD
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