Method for preparing unsaturated polyester resin from wastes of benzoic anhydride production process and distillation fraction

Abstract

The invention discloses a manufacturing method for producing an unsaturated vibrin by utilizing the wastes and the distilling fractions generated during a phthalic anhydride production process, which belongs to the composing manufacture industry of a macromolecule compound. In the invention, the wastes, the distilling fractions, diethylene glycol, glycol and a catalyst are firstly fed into a reaction kettle and mixed uniformly; the temperature is gradually raised; when the temperature of the reaction kettle is raised to 200 DEG C, the temperature is controlled to be 200 to 220 DEG C for about 3 to 8 hours; when an acid value achieves to 35 to 40, vacuumizing is carried out for 1 to 2h; then a polymerization inhibitor and cinnamene are added into a diluting kettle; the adding amount of the polymerization inhibitor is 100 to 200ppm; when the acid value of the reaction kettle reaches a theoretical value (30 to 35), the temperature is reduced to 150 to 170 DEG C; then the unsaturated vibrin in the reaction kettle is transferred into the diluting kettle for dilution, adjusted into a proper viscosity and packaged. The technique of the method of the invention is simple and changes wastes to be valuable as well as changes the harm into benefit; in addition, the method of the invention can generate excellent economic benefits, reduce the pollution of the wastes to the environment and is beneficial to environment protection.

Description

technical field [0001] The invention relates to a method for producing unsaturated polyester resin, in particular to a method for producing unsaturated polyester resin using waste and distillation fractions produced in the production process of phthalic anhydride, which belongs to the synthetic manufacturing industry of polymer compounds. Background technique [0002] At present, most of the waste and distillation components produced in the production of phthalic anhydride are directly discharged, and these wastes are harmful substances, which will cause serious pollution to organisms and the environment. Even if there is recycling to concentrate and transposition to produce fumaric acid, But this product is not only a waste of energy but also difficult to sell, because only about 10% of acid is contained in its waste water. Furthermore, there is separation and recovery of waste liquid produced in the production process of phthalic anhydride, but its process is complicated, ...

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Problems solved by technology

[0002] At present, most of the waste and distillation components produced in the production of phthalic anhydride are directly discharged, and these wastes are harmful substances, which will cause serious pollution to organisms and the environment. Even if there is recycling to concentrate and transposition to produce fumaric acid, But this product is not only a waste of energy but also not easy to sell, because only about 10% of acid is contained in its waste water

In addition, there is separation and recovery of waste liquid produced in the production process of phthalic anhydride, but its process is complicated, the cost is high, and it causes secondary pollution

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