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Process for synthesis of pentaerythritol tetraheptanoate by catalysis of phosphotungstic acid

A technology of pentaerythritol tetraheptanoate and pentaerythritol, which is applied in the field of phosphotungstic acid to catalyze the synthesis of pentaerythritol tetraheptanoate, which can solve problems such as environmental pollution, difficult conditions to control, and waste acid corrosion of equipment, so as to shorten the reaction time and reduce production costs , Optimizing the effect of reaction conditions

Inactive Publication Date: 2002-10-09
ZHONGBEI UNIV
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  • Summary
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Problems solved by technology

The general esterification reaction is carried out under the catalysis of concentrated sulfuric acid or concentrated phosphoric acid, especially the esterification of polyol esters, such as pentaerythritol esters, etc., due to the many branches of its molecules, the large steric hindrance effect, and difficult esterification, not only The reaction time is required to be 10-16 hours, and the vacuum degree must be well controlled during the entire reaction stage, the conditions are difficult to control, and the product is difficult to purify, etc.; in addition, the waste acid will not only corrode the equipment, but also cause environmental pollution

Method used

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Embodiment Construction

[0008] The molar ratio of pentaerythritol to heptanoic acid is 1:5; phosphotungstic acid is 1% of the weight of pentaerythritol in terms of weight percentage. According to the previous steps, pentaerythritol tetraheptanoate can be obtained.

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Abstract

A process for catalytically synthesizing pentaerythritol tetraheptanoate is characterized by that the pentaerythritol and heptanoic acid in a mole ratio of 1:(5-7) are used as raw materials and the phosphotungstic acid is used as catalyst. Its advantages are high catalytic effect, high esterifying rate, short reaction time and low cost.

Description

Technical field: [0001] The invention relates to a process for polyol esterification, in particular to a method for catalyzing and synthesizing pentaerythritol tetraheptanoate with phosphotungstic acid. Background technique: [0002] Pentaerythritol tetraheptanoate is a polyol ester with development potential. Due to the special chemical structure of polyols, lubricating oils based on such esters not only have excellent thermal stability and oxidation stability, but also have good viscosity-temperature performance, lubricating performance and excellent low-temperature viscosity characteristics. The general esterification reaction is carried out under the catalysis of concentrated sulfuric acid or concentrated phosphoric acid, especially the esterification of polyol esters, such as pentaerythritol esters, etc., due to the many branches of its molecules, the large steric hindrance effect, and difficult esterification, not only The reaction time is required to be 10-16 hours, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C69/33
Inventor 方莉王建中杨云峰
Owner ZHONGBEI UNIV
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