Current Location： Home > News > Chemical Knowledge > Manufacturing method and process flow of acrylic acid series

[Chemical Knowledge]：Manufacturing method and process flow of acrylic acid series

Read： 1733 Time：20months ago Source：Transform the World with Simplicity

The manufacturing method
of acrylic acid series
1. Introduction

Acrylic acid series compounds are an important organic chemical raw materials, widely used in coatings, adhesives, plastics, fibers, leather and other fields. This article will introduce the manufacturing methods of acrylic acid series, including the production processes of acrylic acid, acrylate and acrylamide.

2. acrylic acid production process

1. Propylene oxidation

Propylene oxidation is the main method for the production of acrylic acid, which uses propylene, air and water as raw materials, under the action of a catalyst, through oxidation reaction to produce acrylic acid.

reaction equation: CH2 = CH-CH3 1/2 O2 → CH2 = CH-COOH

The process includes three steps: oxidation reaction, absorption and separation. The oxidation reactor is generally a tubular or tower reactor, the reaction temperature is controlled at 140-180°C, and the pressure is controlled at 0.2-0.4MPa. The gas generated by the reaction is cooled and absorbed to obtain an aqueous solution of acrylic acid, which is then separated by distillation to obtain pure acrylic acid.

2. Acetylene carbonylation

Acetylene carbonylation is another method for the production of acrylic acid, which uses acetylene, carbon monoxide and water as raw materials, under the action of a catalyst, through the carbonylation reaction to produce acrylic acid.

reaction equation: CH ≡ CH CO H2O → CH2 = CH-COOH

The process also includes oxidation reaction, absorption and separation steps. A rhodium-based catalyst is generally used as the catalyst. The production process of

3. acrylate

acrylate is the product of esterification of acrylic acid and alcohol compounds, which is widely used in coatings, adhesives and other fields. The production process of acrylate is mainly esterification and ester exchange.

1. esterification method

esterification method is based on acrylic acid and alcohol as raw materials, under the action of acid catalyst, esterification reaction to produce acrylate.

reaction equation: CH2 = CH-COOH ROH→ CH2 = CH-COOR H2O

where R is an alkyl group or an aryl group. The process needs to control the reaction temperature and the amount of acid catalyst to improve the esterification yield and product quality.

2. Transesterification

Transesterification is based on acrylate and alcohol as raw materials, in the presence of a catalyst, ester exchange reaction to generate new acrylate.

reaction equation: CH2 = CH-COOR1 ROH2 → CH2 = CH-COOH2 ROH1

where R1 and R2 are different alkyl or aryl groups. Transesterification method can be used to produce some special structure of acrylate.

4. the production process of acrylamide

acrylamide is the product of the reaction of acrylic acid with ammonia or ammonium salt, widely used in water treatment agents, paper additives and other fields. The main production processes of acrylamide are aqueous solution polymerization and emulsion polymerization.

1. aqueous solution polymerization method

aqueous solution polymerization method is acrylic acid, ammonia and initiator as raw materials, polymerization reaction in aqueous solution to produce acrylamide.

reaction equation: nCH2 = CH-COOH nNH3 → -[-CH2-CH(CONH2)-] n-nH2O

The process needs to control the reaction temperature, pH value and the amount of initiator and other factors in order to obtain the acrylamide product with moderate molecular weight and excellent performance.

2. emulsion polymerization method

emulsion polymerization method is acrylic acid, ammonia and emulsifier as raw materials, in the emulsion polymerization reaction to produce acrylamide emulsion. The process has the advantages of fast reaction speed and good product quality.

The above is the manufacturing method of acrylic acid series compounds. Different production processes have different characteristics and scope of application. It is the key to choose the appropriate production process according to specific needs and conditions.

Previous： Manufacturing method and process flow of acetic acid series

Next： Production and manufacturing methods and processes of intermediates

News Categories