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Use of SnO catalyst in esterifying maleic anhydride

A technology of maleic anhydride ester and catalyst is applied in the application field of SnO catalyst in maleic anhydride esterification, which can solve the problem of high price and achieve the effects of no corrosion of equipment, good heat resistance and high catalytic activity.

Inactive Publication Date: 2003-08-13
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Heteropoly acid and phase transfer catalyst both have the problem of high price

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0015] 20g SnO (chemically pure, Beijing Chemical Plant, batch number 750266, content not less than 88%) was added to 50ml concentrated hydrochloric acid (analytical pure, content 36-38wt%) and 50ml deionized water, after dissolving, it became a light yellow solution, and then added 24.5gBaCl 2 2H 2 O (Shenyang Reagent Factory), after fully stirring and dissolving, add 10% KOH (analytical pure, imported sub-packaging, content not less than 82%) solution to pH7, filter, wash three times, and dry at 100-110°C for 4 hours to obtain 21 g of black powder.

example 2

[0017] 50g of maleic anhydride (produced in Fushun, industrial grade) was added to 140ml of n-hexanol (Beijing Chemical Reagent No. 3 Factory, chemically pure, batch number 871018) to dissolve, and then titrated with 0.4442N KOH in ethanol water (50:50vol) to measure the solution Acid value: 203.6mgKOH / g solution, the solution is colorless and transparent. Add 2g of the catalyst of Example 1, heat to reflux, and water begins to flow out at 140°C. After 1 hour of reaction, the temperature is 210°C, and about 11ml of water is reacted. After the reaction, the acid value of the solution is 3.1mgKOH / g solution, and the esterification rate is 98.5%.

example 3

[0019] 50g of maleic anhydride (produced in Fushun, industrial grade) was added to 180ml of n-hexanol (Beijing Chemical Reagent No. 3 Factory, chemically pure, batch number 871018) to dissolve, and then titrated with 0.4442N KOH in ethanol water (50:50vol) to measure the solution Acid value: 168mgKOH / g solution, the solution is colorless and transparent. Add 2g of the catalyst of Example 1 dried under vacuum (20-30mmHg) at 200°C, heat to reflux, and water begins to flow out at 138°C. After 1 hour of reaction, the temperature is 190°C, about 11ml of water is produced, and the acid value of the solution after the reaction is 4.1mgKOH / g solution, the esterification rate is 97.6%.

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Abstract

The present invention relates to a maleic anhydride esterification catalyst, its basic composition is SnOx, which is made up by using Sn and precursor of alkaline earth metal through the processes of precipitation, washing and drying in the presence of alkaline solution, in which the Sn and precursor of alkaline earth metal are bivalent soluble salt of Sn and soluble salt of alkaline earth metal; the required aklai is ammonia water, alkali metal hydroxide or alkaline earth metal hydroxide; in the course of precipication it has need of stirring, and the precipitated final pH value is 4-8; then said material is washed three times by using deisnized water, and dried for 2-10 hr. at 100-110 deg.C to obtain the invented catalyst with high activity and water stability. Said invented preparation method is simple, and it raw material is low in cost and easily available.

Description

technical field [0001] The invention relates to the esterification of maleic anhydride and alcohol, in particular to the application of a SnO catalyst in the esterification of maleic anhydride. Background technique [0002] Dialkyl maleate is an important organic chemical raw material, mostly used to synthesize resin. Impregnating agents, dispersants and lubricants in petrochemical, fabric, plastic and paper industries, and can be used as plasticizers for polyvinyl chloride-based resins and methacrylic resins. Dialkyl maleate is hydrogenated to produce 1,4-butanediol, γ-butyrolactone and tetrahydrofuran, all of which are important basic organic chemical raw materials. [0003] The esterification reaction of maleic anhydride and alcohol is carried out in two steps. First, maleic anhydride and alcohol generate monoalkyl maleate at a suitable temperature, this step does not require a catalyst and the selectivity is 100%, then the monoalkyl maleate continues to react with alco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/14
Inventor 徐德祝孙孝英徐翠兰王翠菊周业慎张涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI