Manufacturing method of methyl acrylate nitrile
I. INTRODUCTION
Methyl acrylate nitrile is an important organic chemical raw material, which is widely used in synthetic fibers, plastics, rubber, coatings and other fields. Due to its unique chemical properties and wide range of applications, the manufacturing method of methyl acrylate nitrile has attracted much attention. In this paper, the manufacturing method of methyl acrylate nitrile will be introduced in detail, including raw material preparation, reaction process, post-treatment and so on.
II. Raw material preparation
The main raw materials for manufacturing methyl acrylate nitrile include acrylic acid, methanol and sodium cyanide. Among them, the ratio of acrylic acid and methanol is generally 1:1.1-1.2, and the amount of sodium cyanide is 1.0-1.2 times the number of moles of acrylic acid. During the preparation of the raw materials, the purity and quality of the raw materials need to be ensured to avoid adverse effects on the subsequent reaction.
Three, reaction process
The manufacturing process of methyl acrylate nitrile mainly includes two steps: esterification reaction and nitrile reaction. The specific steps are as follows:
1. Esterification reaction: add acrylic acid and methanol into the reactor according to a certain ratio, add a small amount of acid catalyst, such as sulfuric acid or p-toluenesulfonic acid, and heat it up to a certain temperature to carry out the esterification reaction. Temperature and pH need to be controlled during the reaction to ensure the smooth progress of the reaction. After the esterification reaction is completed, methyl acrylate is obtained.
2. Nitration reaction: Add methyl acrylate and sodium cyanide into the reactor according to a certain ratio, add a small amount of phase transfer catalyst, such as tetrabutylammonium bromide or triethylbenzylammonium chloride, and heat it to a certain temperature to carry out nitration reaction. The temperature and pH need to be controlled during the reaction to avoid the generation of by-products. After the completion of the nitrification reaction, methyl acrylate nitrile was obtained.
IV. Post-treatment
After the reaction is completed, the product needs to be post-treated to obtain pure methyl acrylate nitrile. The post-treatment process mainly includes steps such as distillation, washing and drying. The specific steps are as follows:
1. Distillation: The reaction solution is distilled to separate the unreacted raw materials and by-products to obtain crude methyl acrylate nitrile.
2. Washing: The crude methyl acrylate nitrile is washed with dilute alkaline solution to remove the acidic impurities therein. Then wash with water to neutral to obtain pure methyl acrylate nitrile.
3. Drying: The pure methyl acrylate nitrile was dried to remove water and other impurities in it.
V. Precautions
In the process of manufacturing methyl acrylate nitrile, the following matters need to be paid attention to:
1. Control the quality and purity of the raw materials in order to avoid adverse effects on the reaction.
2. Control the reaction temperature and pH to ensure the smooth progress of the reaction and avoid the generation of by-products.
3. In the post-treatment process, the purity and quality of the product need to be ensured in order to avoid any influence on the subsequent applications.
VI.CONCLUSION
Methyl acrylate nitrile is an important organic chemical raw material, and its manufacturing method mainly includes two steps of esterification reaction and nitrile reaction. In the post-treatment process, distillation, washing and drying steps are needed to ensure the purity and quality of the product. During the manufacturing process, attention needs to be paid to controlling the quality and purity of raw materials, reaction temperature and pH value to ensure the smooth progress of the reaction and avoid the generation of by-products.
