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[Chemical Knowledge]：2-Methacrolein Manufacturing Method and Process

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2-Methylpropenal (2-Methylpropenal) is an important organic chemical raw material, which is widely used in the synthesis of spices, pharmaceutical intermediates and other fields. This article will introduce the manufacturing method of 2-methacrolein, including raw material preparation, reaction process, post-treatment and so on.

1. raw material preparation

manufacturing 2-methacrolein raw materials are mainly acetone, formaldehyde and sodium hydroxide. Among them, acetone serves as a carbon source and a hydrogen source, formaldehyde provides an aldehyde group, and sodium hydroxide serves as a catalyst.

2. reaction process

1. alkali catalyzed reaction

sodium hydroxide is added to the mixture of acetone and formaldehyde, control a certain temperature and pH value, make acetone and formaldehyde alkali catalyzed reaction, generate 2-methacrolein.

2. Dehydrogenation reaction

On the basis of base catalytic reaction, the aldehyde group in 2-methacrolein is combined with hydrogen atom by dehydrogenation reaction to generate 2-methacrylic acid.

3. Distillation Separation

Methacrolein in the reaction liquid is separated from unreacted raw materials, by-products and the like by distillation separation to obtain 2-methacrolein having a high purity.

3. post-treatment

1. Refining and purifying

Through the method of refining and purifying, the impurities in 2-methacrolein are further removed to improve the purity of the product.

2. Storage and packaging

The refined and purified 2-methacrolein is stored in a sealed container to avoid contact with air, moisture, etc., so as not to affect product quality.

4. precautions

1. Control the reaction temperature and pH value to ensure the smooth progress of the reaction and the purity of the product.

2. Pay attention to safety during operation and avoid contact with sensitive parts such as skin and eyes.

3. For waste liquid, waste gas and other wastes should be treated to avoid pollution to the environment.

In short, the manufacturing method of 2-methacrolein involves multiple links, and the reaction conditions and operation process need to be strictly controlled to ensure the quality and yield of the product. At the same time, pay attention to safety and environmental protection in the production process, and abide by relevant laws, regulations and standards.

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