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

Inactive Publication Date: 2009-01-21
HUACHANG POLYMER EAST CHINA UNIV OFSCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In a four-necked flask with a thermometer, a stirrer, a nitrogen inlet pipe and a fractionation device, successively drop into 76g propylene glycol, 55g diethylene glycol, and 102g terephthalic acid washing residue (wherein the moisture content is 20%, and the phthalic acid Diformic acid 65g, p-toluic acid 16g), 0.4g composite catalyst (including 0.3g tetrabutyl titanate and 0.1g zinc acetate). When the nitrogen gas is fed, the temperature is gradually raised. When the temperature of the reactant is 130-140°C, water begins to distill out. Continue to raise the temperature, and control the temperature of the fractionation column to be lower than 105°C until the acid value is lower than 10mgKOH / g. Lower the material below 160°C and add 98g of maleic anhydride, gradually increase the temperature and control the temperature of the fractionation column to be lower than 105°C, when the acid value reaches below 60mgKOH / g, start vacuuming to force the water to evaporate until th...

Embodiment 2

[0030] With 37g ethylene glycol, 76g propylene glycol, 119g terephthalic acid washing residue (wherein water content 25%, terephthalic acid 76g, p-toluic acid 13g), 0.4g composite catalyst (comprising 0.3g tetrabutyl zirconate and 0.1g sodium acetate) into the device shown in embodiment 1, in subsequent steps, fumaric acid 116g, hydroquinone 0.05g, styrene 171g, operate by the same operating steps as in embodiment 1.

Embodiment 3

[0032] With 159g diethylene glycol, 156g neopentyl glycol, 200g terephthalic acid washing residue (wherein water content 30%, terephthalic acid 123g, p-toluic acid 17g), 0.6g composite catalyst (comprising 0.45 g tetrabutyl titanate and 0.15g manganese acetate) drop into the device shown in example 1, maleic dianhydride is changed into 196g in subsequent steps, hydroquinone is changed into 0.10g, styrene is changed into 350g, Operate in the same steps as in Example 1.

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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 washing residue, in particular to a method for producing terephthalic acid unsaturated polyester resin using terephthalic acid washing residue. 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 a raw material, acetic acid as a solvent, cobalt acetate, manganese acetate and tetrabromoethane as a three-way catalyst, and is oxidized by air at a certain temperature and pressure to generate crude terephthalic acid. This process is called the oxidation unit. In order to remove the impurity p-carboxybenzaldehyde in crude terephthalic acid, a carbon-palladium catalyst is used for hydrogenation reduction to generate p-toluic acid. This process is called a refining unit. [0003] A large number of by-products are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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