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

A hydroxybutyl acrylate and production process technology, which is applied in the preparation of carboxylate, the preparation of organic compounds, the separation/purification of carboxylate, etc., can solve the problems of deepening product color, difficulty in separation and purification, and easy polymerization. Achieve low production cost, simple process, good activity and flexibility

Inactive Publication Date: 2018-12-21
QINGDAO UNIV OF SCI & TECH
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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

Method used

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

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Embodiment Construction

[0026] Below by specific embodiment the present invention is further described:

[0027] The main steps of the technical process of producing 4-hydroxybutyl acrylate by the direct esterification method designed by the present invention are as follows:

[0028] Reaction section: 1,4-butanediol with a mass flow rate of 24.75kg / h, p-toluenesulfonic acid with a mass flow rate of 0.3kg / h, acrylic acid with a mass flow rate of 13.15kg / h, and a mass flow rate of The hydroquinone of 0.05kg / h, the p-hydroxyl methyl ether of mass flow rate 0.05kg / h is added in the reactor and reacted, and the reaction product contains 52.5% of 4-hydroxybutyl acrylate, 10.8% of 1,4 - Butanediol diacrylate, 0.19% of acrylic acid, 0.01% of hydroquinone and para-hydroxyanisole, 0.5% of p-toluenesulfonic acid, 27.6% of 1,4-butanediol, 8.5% of water.

[0029] After the reaction finished, stream 3 was rich in 4-hydroxybutyl acrylate, 1,4-butanediol diacrylate, 1,4-butanediol and a small amount of acrylic acid...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/54C07C67/58C07C67/08C07C67/48
CPCC07C67/08C07C67/48C07C67/58C07C69/54
Inventor 王伟文段继海兰君钰陈光辉李建隆张自生
Owner QINGDAO UNIV OF SCI & TECH
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