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Composite catalyst for polyalcohol esterification reaction

A technology of polyol esters and catalysts, which is applied in the field of catalysts for the synthesis of pentaerythritol tetraesters, and can solve the problems of slow reaction speed and long reaction time

Inactive Publication Date: 2012-07-04
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the weak acidity, the reaction speed is slow and the reaction time is long

Method used

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  • Composite catalyst for polyalcohol esterification reaction
  • Composite catalyst for polyalcohol esterification reaction
  • Composite catalyst for polyalcohol esterification reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 720 parts by weight of isooctanoic acid and 136 parts by weight of pentaerythritol into a 250ml four-neck flask equipped with a thermometer, agitator, reflux condenser and water separator, stir and heat to 50°C to completely dissolve the alcohol, and add 2.72 parts by weight of the composite catalyst (dodecylbenzenesulfonic acid: hypophosphorous acid in the composite catalyst = 2: 1, mass ratio), heat the system to 160° C., react at constant temperature for 5 hours, and collect the water generated by the reaction at the same time. Cool to room temperature after the reaction, measure the amount of water produced at the end of the reaction, and calculate the esterification rate to be 99.9%.

[0019] Post-processing of the product: filter the reaction solution, and the filtered catalyst is washed and dried for recycling. The filtrate was washed 4 times with 100 parts of excess 5% NaOH. The obtained organic phase was washed with water until neutral to obtain a light ye...

Embodiment 2～6

[0021] Press the experimental method of embodiment 1, change the mass ratio of p-toluenesulfonic acid and hypophosphorous acid in composite catalyst, experimental result is as follows:

[0022]

[0023] *The catalyst is p-toluenesulfonic acid: hypophosphorous acid, mass ratio.

Embodiment 7

[0025] According to the experimental method of embodiment 1, use composite catalyst to be p-toluenesulfonic acid: phosphorous acid=2: 1 (mass ratio), the esterification rate obtained is 99.8%, and the color and luster of product is yellow-white.

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Abstract

The invention provides a composite catalyst for a polyalcohol esterification reaction. The composite catalyst is characterized by consisting of para-alkyl benzene sulphonate, and protonic acid and Lewis acid having reducing properties. The composite catalyst has high activity, the esterification transformation ratio can be increased effectively, and product chroma can be lowered effectively; the composite catalyst is insoluble in a reaction system at the start of a reaction, forms a homogeneous system with an organic phase in a reacting process and is precipitated out of the reaction system at the end of the reaction, and the precipitated catalyst still has high catalytic activity.

Description

technical field [0001] The invention belongs to the fine chemical industry field, and in particular relates to a catalyst for synthesizing pentaerythritol tetraester compounds. The synthesized esterification products are widely used in the fine chemical industry fields such as lubricating oils. Background technique [0002] Synthetic lubricants were developed in the mid-1930s to accommodate the increasingly demanding design requirements of modern machinery. Synthetic lubricating oil agents can usually extend the oil change period by 8 to 10 times, save energy by 1% to 7%, and have good comprehensive economic benefits. Pentaerythritol esterified lubricants are mainly used in aviation lubricants, automotive lubricants, air compressor oils, synthetic semiconductor process oils, wind turbine lubricants, etc., with good low-temperature viscosity and high viscosity index, anti- It is a very promising new lubricating oil with high temperature oxidation characteristics and flame re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/26B01J31/04C07C67/08C07C69/33
Inventor 李坤兰马英冲魏立纲苏娜
Owner DALIAN POLYTECHNIC UNIVERSITY
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