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Process for producing terephthalic unsaturated polyester resin by using terephthalic acid rinsing residue

A terephthalic acid and polyester resin technology, applied in chemical instruments and methods, carboxylate preparation, organic compound preparation, etc., can solve the problem of low utilization rate of terephthalic acid and p-toluic acid and product purity Low-level problems, to achieve the effect of improving poor miscibility, speeding up the reaction rate, and improving utilization efficiency

Inactive Publication Date: 2006-10-11
HUACHANG POLYMER EAST CHINA UNIV OFSCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of this invention is to provide a new method for synthesizing p-phenylene type unsaturated polyester resin by reclaimed terephthalic acid washing residue as main raw material, to solve the problem of terephthalic acid and p-toluic acid utilization in the prior art. Low yield, low purity of the obtained product, etc., effective use of valuable substances in washing residues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In a four-necked flask with a thermometer, a stirrer, a nitrogen inlet pipe and a fractionation device, 76g of propylene glycol, 55g of diethylene glycol, 102g of terephthalic acid water-washing residue (wherein the water content is 20%, terephthalate in 65 g of dicarboxylic acid, 16 g of p-toluic acid), 0.4 g of composite catalyst (including 0.3 g of tetrabutyl titanate and 0.1 g of zinc acetate). The temperature is gradually increased under the condition of introducing nitrogen gas. When the temperature of the reactant is 130-140 ° C, water begins to distill, and the temperature is continued to rise, and the temperature of the fractionation column is controlled to be lower than 105 ° C until the acid value is lower than 10 mgKOH / g. Drop the material to below 160°C, add 98g maleic anhydride, gradually increase the temperature to control the temperature of the fractionation column to be lower than 105°C, and start vacuuming when the acid value reaches below 60mgKOH / g to ...

Embodiment 2

[0031] 37g ethylene glycol, 76g propylene glycol, 119g terephthalic acid water-washing residue (including 25% water content, 76g terephthalic acid, 13g p-toluic acid), 0.4g composite catalyst (including 0.3g tetrabutyl zirconate) and 0.1 g of sodium acetate) into the device shown in Example 1, and in the subsequent steps, 116 g of fumaric acid, 0.05 g of hydroquinone, and 171 g of styrene were operated according to the same operation steps as in Example 1.

Embodiment 3

[0033] 159g of diethylene glycol, 156g of neopentyl glycol, 200g of terephthalic acid washing residue (including 30% water content, 123g of terephthalic acid, 17g of p-toluic acid), 0.6g of composite catalyst (including 0.45 g tetrabutyl titanate and 0.15 g manganese acetate) were put into the device shown in Example 1, and in the subsequent steps, maleic dianhydride was changed to 196 g, hydroquinone was changed to 0.10 g, and styrene was changed to 350 g, Follow the same steps as in Example 1.

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PUM

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Abstract

This invention is preparation of unsaturated polyester resin. The raw material is the terephthalic acid waste containing terephthalic acid 80%-90% and p-aminobenzoic acid 10%-20%. The procedure is as followings: add diatomic alcohol and catalytic composite into the terephthalic acid waste for polycondensation reaction. Add unsaturated diacid for further polycondensation. Add phenylethene for permutoid reaction. This invention's raw material is wasted washing water. The facility is the general ones for unsaturated polyester resin. The product has lower price, high quality, stability and environment-friendness. It could be used in a large scale of tube of glass fibre reinforced plastic, storage tank and instrument backing strip.

Description

technical field [0001] The invention relates to a method for recycling terephthalic acid water-washing residues, in particular to a method for producing terephthalic acid water-washing residues to produce terephthalic acid unsaturated polyester resins. Background technique [0002] Terephthalic acid is an important organic chemical raw material, mainly used in the production of polyester fibers, coatings, films and engineering plastics. At present, terephthalic acid uses p-xylene as raw material, acetic acid as solvent, and cobalt acetate, manganese acetate and tetrabromoethane as three-way catalysts, and air oxidation under certain temperature and pressure generates crude terephthalic acid. This process is called an oxidation unit. In order to remove the impurity p-carboxybenzaldehyde in the crude terephthalic acid, a carbon palladium catalyst is used to carry out a hydrogenation reduction reaction to generate p-toluic acid. This process is call...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G63/46C07C63/26C07C51/64
Inventor 钱建华刘坐镇
Owner HUACHANG POLYMER EAST CHINA UNIV OFSCI & TECH
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