A method of a phenyl -bonacharin anhydride distillation of heavy -quality residual liquid to prepare alcoholic acid resin
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A technology of trimellitic anhydride and alkyd resin, applied in coatings, polyester coatings, etc., to achieve the advantages of cost performance, simple process and high yield
Active Publication Date: 2021-09-24
NANTONG BAICHUAN NEW MATERIAL CO LTD +1
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[0006] The purpose of the present invention is to provide a method for preparing alkyd resin based on trimellitic anhydride rectification heavy raffinate, which involves using trimellitic anhydride rectification heavy raffinate as raw material, adding corresponding monohydric alcohol for esterification and washing with water to remove inorganic salts, adding corresponding multi-element Alkyd resin products are prepared by alcohol reaction, which solves the pollution caused by the traditional direct incineration method to deal with the heavy residue of trimellitic anhydride, promotes the recycling of resources, and improves economic benefits
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Embodiment 1
[0023] S1. Trimellitic anhydride feedstock heavy raffinate distillation 300g, 600g of n-butanol and tetraisopropyl titanate catalyst 7g, flask equipped with a stirrer, a thermometer, a trap and a condenser tube reactor, the reaction vessel was slowly warmed after stirring the raw material is melted open;
[0024] S2. When the temperature was raised to After the reaction temperature reached the boiling point of the monohydric alcohol, the gas phase through a condenser to condense and separate the water generated by the reaction, the reaction time Minute every hour samples measured acid value of the reaction system, trimellitic anhydride to obtain a heavy raffinate distillation monoalcohol esterified;
[0025] After heating was stopped when S3. An acid value of less than 50mgKOH / g, the temperature drops to 60 ℃, ethyl acetate was added 1000g, 500g of water was stirred for 30 minutes, after releasing the stationary phase stratified water, then 500g of water was added, stirred and...
Embodiment 2
[0029] S1. Trimellitic anhydride feedstock heavy raffinate distillation 300g, 1200g n-octanol and tetraisopropyl titanate catalyst 7g, flask equipped with a stirrer, a thermometer, a trap and a condenser tube reactor, the reaction vessel was slowly warmed after stirring the raw material is melted open;
[0030] S2. When the temperature was raised to After the reaction temperature reached the boiling point of the monohydric alcohol, the gas phase through a condenser to condense and separate the water generated by the reaction, the reaction time Every hour samples measured acid value of the reaction system, trimellitic anhydride to obtain a heavy raffinate distillation monoalcohol esterified;
[0031] After the heating was stopped when S3. An acid value of less than 50mgKOH / g, the temperature drops to 60 ℃, butyl acetate was added 1000g, 500g of water was stirred for 30 minutes, the aqueous phase discharged after static stratification, 500g of water was added after stirring unif...
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Abstract
The invention belongs to the technical field of fine chemicals, and specifically relates to a method for preparing alkyd resin based on trimellitic anhydride rectification heavy raffinate, the reaction of trimellitic anhydride rectification heavy raffinate, monohydric alcohol and catalyst in a molten state, through a water separator Separate the water phase to obtain the monohydric alcohol esterification product of trimellitic anhydride rectification heavy raffinate. After the acid value meets the requirements, lower the temperature, add organic solvent and water, stir and mix evenly, then stand still, drain the water phase, and recover the reaction product through the rectification separation column. Solvent and monohydric alcohol, start the vacuum pump, distill out the reacted polyhydric alcohol in the reaction liquid, add organic solvent, stir and mix evenly to obtain the alkyd resin product. The preparation process of the present invention is simple and has high productivity, which is conducive to the batch preparation of high-performance alkyd resins. The polybasic acid in the heavy residual liquid of trimellitic anhydride rectification is used as a raw material to reduce the production cost of the product alkyd resin, improve economic benefits, and make the product have a strong price advantage.
Description
Technical field [0001] The present invention belongs to the technical field of fine chemicals, in particular to a preparation based on heavy raffinate distillation trimellitic anhydride method alkyd resin. Background technique [0002] Trimellitic anhydride heavy raffinate distillation is trimellitic anhydride production process, the raffinate through a series of steps trimethylbenzene partial oxidation, anhydride, and the like produced by distillation. The heavies content of the residual liquid is large, trimellitic anhydride, Pro, isophthalic acid and terephthalic acid compound containing a plurality of carboxyl groups and a small amount of cobalt acetate, manganese acetate. Past mainly direct incineration process trimellitic anhydride raffinate heavy, which is not conducive to environmental protection and resource recycling, is not conducive to improving economic efficiency, because trimellitic anhydride heavy raffinate distillation is a mixture mainly containing a plurality o...
Claims
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