Method for using stannous oxide catalyst in esterification step in production of plasticizer

Abstract

The invention discloses a method for using a stannous oxide catalyst in an esterification step in the production of a plasticizer, which is characterized by hot spraying stannous oxide onto an inner wall of a reaction kettle and the pipe wall of an inner disc in a spraying thickness of 0.1 mm. In an esterification reaction, a heat sources heats the catalyst first to improve the temperature and activity of the catalyst to improve reaction speed consequently; in the production, no other catalyst is required to be added into the reaction kettle; and the method can shorten production period, optimize production process and save production cost.

Description

technical field [0001] The invention relates to a method for adding an esterification reaction catalyst in the plasticizer industry, in particular to a method for using the catalyst stannous oxide in the esterification reaction. Background technique [0002] At present, in the process of industrial production of plasticizers at home and abroad, the catalysts used in the esterification process mainly include: sulfuric acid, non-acid titanate, and stannous oxide. [0003] ①Using sulfuric acid as a catalyst has good activity and low reaction temperature, but it has serious corrosion on unprepared parts and many side reactions. After the reaction, it needs to be neutralized with alkali and washed with water to remove sulfuric acid, resulting in complicated production process and large material loss; [0004] ②The use of non-acid titanate as a catalyst has the advantages of high catalytic activity, good selectivity, less side reactions, no corrosion of equipment and relatively le...

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Problems solved by technology

[0003] ①Using sulfuric acid as a catalyst has good activity and low reaction temperature, but it has serious corrosion on unprepared parts and many side reactions. After the reaction, it needs to be neutralized with alkali and washed with water to remove sulfuric acid, resulting in complicated production process and large material loss;

[0004] ②The use of non-acid titanate as a catalyst has the advantages of high catalytic activity, good selectivity, less side reactions, no corrosion of equipment and relatively less waste water, but after the reaction is completed, neutralization and water washing processes are required to remove the catalyst in the material and hydrolyze material, and titanium ions will remain in the material, affecting the resistivity of the product

In this process flow, alcohol is first added in proportion, then acid anhydride and catalyst are added, and then the temperature rises to react, and the catalyst and materials are fully mixed. After the main reaction is completed, the catalyst and materials enter the next process together. The sodium hydroxide is discharged together, causing waste and environmental pollution

In the esterification process, there are problems of long cycle, low conversion rate, high cost and complicated follow-up process

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