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[Chemical Knowledge]：The production and manufacturing method and process of methyl propylene glycol.

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Methyl Propanediol (MPD) is an important organic chemical raw material, which is widely used in coatings, inks, resins, plasticizers, pharmaceutical intermediates and other fields. This article will introduce the manufacturing method of methyl propylene glycol, including raw material preparation, reaction process, post-treatment and precautions.

1. Raw Material Preparation

1. Acrolein: Acrolein is the main raw material for the preparation of methyl propylene glycol, which can be prepared by the oxidation of propylene.
2. Formaldehyde: Formaldehyde as another raw material, and acrolein addition reaction.
3. Catalyst: Generally, an acidic catalyst is selected, such as sulfuric acid, hydrochloric acid, etc.

2. reaction process

1. addition reaction: under the action of catalyst, acrolein and formaldehyde addition reaction, the generation of 3-hydroxy propionaldehyde.
2. reduction reaction: 3-hydroxy propionaldehyde through reduction reaction, generating methyl propylene glycol. The reduction method may be a chemical reduction method, such as reduction using hydrogen and a catalyst, or reduction using a metal hydride.

3. Post-Treatment

1. Distillation: After completion of the reaction, unreacted raw materials and by-products were separated by distillation to obtain crude methylpropanediol.
2. Refining: The crude methyl propylene glycol needs further refining to remove impurities therein. Purification is usually carried out by distillation, extraction, crystallization and the like.

4. precautions

1. The selection and use of catalyst: The type and dosage of catalyst have an important influence on the reaction speed and selectivity, so it is necessary to choose the appropriate catalyst according to the actual situation.
2. Control of reaction temperature: The reaction temperature also has a great influence on the reaction speed and selectivity, and the temperature control should be carried out according to the reaction situation.
3. Safety protection: Pay attention to safety protection during the production process, avoid contact with toxic and harmful substances, and ensure production safety.

In short, the manufacturing method of methyl propylene glycol includes raw material preparation, reaction process, post-treatment and precautions. By mastering the appropriate manufacturing method, high-quality methyl propylene glycol can be produced, which provides important raw materials for the field of chemical production.

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