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[Chemical Knowledge]：Production process and preparation method of high purity acrylic acid

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High-purity acrylic acid is an important organic chemical, which is widely used in rubber, coatings, plastics, adhesives and other fields. This article will introduce the production process and preparation method of high purity acrylic acid.

1. high purity acrylic acid production process

high purity acrylic acid production generally use olefin oxidation method. The specific process is as follows:

(1) Olefin Intermediate Preparation

Propylene is prepared by distillation or cracking method, and then intermediates such as propionaldehyde or methyl acrylate are prepared by oxidation reaction.

(2) Preparation of Acrylic Acid by Oxidation of Propionaldehyde

High-purity acrylic acid is obtained by oxidation of propionaldehyde with air in the presence of a catalyst. As the catalyst, a transition metal salt, a vanadate, or the like can be used. The reaction temperature is generally 50-120°C and the reaction time is 10-30 hours.

(3) Hydrogenation of Methyl Acrylate to Acrylic Acid

Methyl acrylate and hydrogen are hydrogenated in the presence of a catalyst to obtain acrylic acid of high purity. The catalyst generally uses copper, zinc, silver and other precious metal catalysts. The reaction temperature is generally 150-250 ° C., the reaction pressure is 5-10MPa, and the reaction time is 2-5 hours.
the above two methods can be
to prepare high-purity acrylic acid, the propionaldehyde oxidation method can directly produce acrylic acid, the process is simple, only one step reaction, so it is more commonly used.

2. high-purity acrylic acid preparation method

high-purity acrylic acid preparation method mainly includes three: olefin oxidation method, acetic acid propylene ester plus depolymerization method and hydrogenation method.

(1) Olefin Oxidation Process

The olefin oxidation process is a conventional process for preparing high-purity acrylic acid, and the specific steps are as described above.

(2) Acrylic acetate depolymerization

Acrylic acetate is depolymerized in the presence of a catalyst (such as sodium hydroxide) to obtain high-purity acrylic acid. The method has the advantages of simple operation, high yield, but high cost.

(3) Hydrogenation Method

methyl acrylate is hydrogenated in the presence of a catalyst (e. g., copper, silver, etc.) to obtain acrylic acid of high purity. The method is simple, low cost, but low yield.

3. the application of high-purity acrylic acid

High-purity acrylic acid is an important organic chemical, which is widely used in rubber, coatings, plastics, adhesives and other fields. Specific applications are as follows:

(1) for the production of polypropylene