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Method for preparing PVC plasticizer from by-products of production of fumaric acid and recovery alcohol

A technology for fumaric acid and alcohol recovery, which is applied in the preparation of carboxylic acid esters, the preparation of organic compounds, chemical instruments and methods, etc., can solve problems such as large costs, and achieve the utilization of corporate waste, reduction of production costs and waste liquid treatment costs. , the effect of reducing environmental pollution

Active Publication Date: 2010-11-03
ZHENJIANG UNION CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Large-scale phthalic anhydride production enterprises produce hundreds of tons of waste acid slag every year, and it costs a lot of money to dispose of these wastes

Method used

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  • Method for preparing PVC plasticizer from by-products of production of fumaric acid and recovery alcohol

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Experimental program
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Embodiment Construction

[0011] The steps of the embodiment of the present invention are as follows:

[0012] The first step: add 1 part of acid slag, 3.0 parts of reclaimed isooctyl alcohol in the reactor equipped with thermometer, distillation condensing device (jacketed), stirring device, then add 250ppm of esterification catalyst (tin oxalate compound ), heated to effluent (120-160°C) with stirring, the second step: continue to heat up to a maximum reaction temperature of 220°C, always control the temperature of the distillation head at 90-102°C during the reaction, and react until the acid value is less than 1.0 mgKOH / g; Step 4: Cool down to 195°C, dealcoholize under reduced pressure (-680mmHg) for 1 hour, stop the reaction, cool down and filter to obtain the finished product, and collect the released alcohol for recycling.

[0013] The product detection index of the embodiment of the present invention is as follows:

[0014] 1. Product chemical properties:

[0015] project

Acid va...

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Abstract

The invention relates to a method for preparing a PVC plasticizer by taking by-products of production of fumaric acid and recovery alcohol as raw materials. The method comprises the following steps of: 1, adding 1 part of acid water residues, 2 to 4 parts of recovery isooctanol or recovery isononyl alcohol and 200 to 400ppm of esterification catalyst into a reactor with a thermometer, a distillation and condensing device and a stirring device, and heating the mixture with stirring to the temperature of between 120 and 160 DEG C for yielding water; 2, continuing heating to the highest reactiontemperature of 220 DEG C, controlling the temperature of cut fraction to be between 80 and 102 DEG C all the time in the process of a reaction, and reacting until an acid value is less than 1.0 mgKOH / g; and 3, reducing the temperature until the temperature is 190 DEG C or 215 DEG C, performing dealcoholization under the reduced pressure of between -600 and -740 mmHg for 1 to 2 hours, stopping thereaction, and cooling and filtering to obtain a finished product. The method can utilize scrap materials of enterprises effectively, reduce the production cost of the plasticizer and the treatment cost of waste liquor and reduce environmental pollution.

Description

technical field [0001] The invention relates to a method for preparing a PVC plasticizer by using fumaric acid production by-products (acid slag) and recovered alcohol (isooctanol or isononyl alcohol) as raw materials. Background technique [0002] Currently there are reports in the literature on the use of fumaric acid and isooctyl alcohol to synthesize plasticizer di-isooctyl fumarate. Liu Xueyan, Department of Chemistry, Huaibei Coal Normal University, and others studied the synthesis of di-octyl fumarate catalyzed by sodium hydrogen sulfate. Fumaric acid and isooctyl alcohol were used as raw materials, NaHSO4 was used as catalyst, and toluene was used as water-carrying agent to synthesize di-isooctyl fumarate. Isooctyl. Liao Pingde, Department of Chemistry and Chemical Engineering, Guangxi Normal University, etc. studied the method and process conditions of synthesizing diisooctyl fumarate with anhydrous copper sulfate as a catalyst. In addition, there are literature a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/60C07C67/08
Inventor 曹锋
Owner ZHENJIANG UNION CHEM IND
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