Production technology and equipment for preparing 4-hydroxybutyl acrylate through extraction separation

Abstract

The invention relates to a production technology and equipment for preparing 4-hydroxybutyl acrylate through extraction separation. The production technology comprises the steps: reacting 1,4-butanediol with acrylic acid under the existence of a catalyst, a polymerization inhibitor and a solvent to obtain main products of 4-hydroxybutyl acrylate and 1,4-butanediol diacrylate; choosing cyclohexaneto extract 1,4-butanediol diacrylate from a water phase at first, then choosing dichloromethane to extract 4-hydroxybutyl acrylate from the water phase and finally obtaining a finished product throughreduced pressure distillation. The production technology disclosed by the invention has the beneficial effects: a set of technological process is designed for the characteristics of physical properties, contents and the like of all the ingredients of a reaction workshop section and a separation workshop section, the final product 4-hydroxybutyl acrylate is obtained through the technological process, and the purity can completely meet an industrial production requirement. The production technology disclosed by the invention has the advantages of simple technology, low required energy consumption and low production cost, and the prepared product has the advantages of high purity, high product yield and good quality.

Description

technical field [0001] The invention belongs to the field of fine chemicals, in particular to a production process and equipment for preparing 4-hydroxybutyl acrylate through extraction and separation Background technique [0002] 4-Hydroxybutyl acrylate has great advantages in improving the chemical resistance, weather resistance and crosslinking density of the resin, improving wettability and adhesion to polar surfaces, and can be used in architectural coatings, automotive coatings and adhesives agent. After the acrylic polyurethane coating is composed of HAR synthesized from 4-hydroxybutyl acrylate and isocyanate, the curing speed of the coating is significantly improved, and various properties of the coating film, such as adhesion, gloss, scratch resistance, weather resistance, and heat resistance Properties, chemical resistance, water resistance, and flexibility are excellent, and 4-hydroxybutyl acrylate has a good application prospect in low-temperature quick-drying a...

AI Technical Summary

Problems solved by technology

[0009] In the preparation of 4-hydroxybutyl acrylate, the boiling point of the main product 4-hydroxybutyl acrylate and the by-product 1,4 butanediol diacrylate are similar, and the boiling point is high, not volatile, contains unsaturated vinyl, and the temperature When it is higher, it is easy to polymerize, which brings difficulties to the separation and purification of products

The method of direct vacuum distillation needs a higher degree of vacuum, and the higher temperature will deepen the color of the product, reduce the yield, increase energy consumption, increase the cost, and be difficult to implement

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