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[Chemical Knowledge]：Production process and preparation method of diethylene ketone

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Diketene (also known as 2-Butanone) is a colorless liquid with a light fragrance, widely used in solvents, coatings, plastics, fibers, pharmaceuticals and other fields. Nowadays, with the development of society, the demand for diketene is increasing year by year. Therefore, this article will introduce the production process and preparation method of diketene.

1. diketene production process

At present, the main production process of diketene is isobutylene-formaldehyde condensation reaction method and isoprene-carbon monoxide condensation reaction method. The following is a detailed description of the two methods:

1. Isobutylene-formaldehyde condensation reaction method

this method can prepare diketene from a mixture of isobutylene, formaldehyde and hydrated hydrofluoric acid. The reaction process is as follows:

Step 1: Add a mixture of isobutylene, formaldehyde and hydrated hydrofluoric acid into a reactor and concentrate it to the required temperature and pressure.

Step 2: After mixing and heating, the diketene is re-condensed and separated off.

Step 3: The excess of isobutene and formaldehyde is removed to obtain pure diketene.

2. Isoprene-Carbon Monoxide Condensation Reaction Method

this method diketene can be prepared from a mixture of isoprene and carbon monoxide. The reaction process is as follows:

Step 1: Put the mixture of isoprene and carbon monoxide into a reaction kettle, and add a transition metal catalyst.

Step 2: After mixing and heating, the diketene is re-condensed and separated off.

Step 3: The impurities were removed by vacuum distillation to obtain pure diketene.

2.

In addition to the above two commonly used production processes, there are other methods for preparing diketene, such as oxygen gas phase catalytic oxidation and microbial methods. The following is a detailed description of the two preparation methods:

1. Oxygen gas phase catalytic oxidation method

This method is to prepare diketene by using oxygen to catalyze the oxidation of isoprene. The reaction proceeds as follows:

Step 1: A mixture of isoprene vapor, oxygen, and an inert gas (e. g., nitrogen) is passed to the catalyst bed.

Step 2: After gas catalysis and mixing, it is heated and condensed again in the reactor to separate organic substances such as diketene.

Step 3: Removal of impurities by vacuum distillation to obtain high purity diketene.

2. Microbiological method

This method is the use of microorganisms (such as bacteria, fungi) through enzymatic reaction synthesis of diketene method, the reaction process is as follows: