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[Chemical Knowledge]：Production and manufacturing method and process flow of octanediol

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Octylene Glycol (OG) is an important raw material widely used in the production of chemical products. It has excellent moisture retention, solubility and low toxicity, and is widely used in cosmetics, medicine, paint, ink and other fields. This article will detail the manufacturing method of octanediol.

1. Chloroethanol method

Chloroethanol method is one of the main methods for the production of octanediol. Its process is as follows:

1. Preparation of chloroethanol: Ethylene oxide reacts with hydrogen chloride gas in aqueous solution to generate chloroethanol.

2. addition reaction of chloroethanol: under the action of alkaline catalyst, chloroethanol and ethylene oxide are added to generate monochlorinated octane glycol.

3. Hydrolysis: Hydrolysis of the monochloro to give octanediol.

the process is mature and the operation is simple, a large amount of waste water and waste gas will be produced in the production process, which will cause certain pollution to the environment.

2. Olefin Oxidation

Olefin Oxidation is a new method developed in recent years. Its process is as follows:

1. Olefin Oxidation: Oxidation of olefins with oxygen to generate aldehydes or ketones.

2. Reduction of Aldehyde or Ketone: Reduction of an aldehyde or ketone to an alcohol gives octanediol.

this method has the advantages of easy access to raw materials, mild reaction conditions and high yield, which is a promising production method.

3. biological method

biological method is a method of producing octanediol by microbial fermentation, the process is as follows:

1. microbial culture: the microbial inoculation in the carbon source, nitrogen source, inorganic salt and other nutrients in the medium, culture.

2. Fermentation process: Under suitable conditions, the microorganism converts the carbon source into octanediol through metabolism.

3. product extraction and purification: through centrifugation, distillation and other processes, from the fermentation broth to extract and purify octanediol.

biological method has the advantages of environmental protection and energy saving, the production process is long, and it is necessary to control the growth and metabolic process of microorganisms to ensure the quality and yield of the product.

4. esterification method

esterification method is a method of producing octanediol through esterification reaction, the process is as follows:

1. Esterification reaction: octanoic acid and ethylene glycol are esterified under the action of acidic catalyst to generate octanoic acid glycol ester.

2. Catalytic hydrogenation: Ethylene glycol octanoate is subjected to catalytic hydrogenation to obtain octanediol.

the method is easy to obtain raw materials, the reaction conditions are mild, but the production process needs a catalyst, and produces a certain amount of waste gas.

In summary, there are many production methods of octanediol, and each method has its advantages, disadvantages and scope of application. In actual production, the appropriate production method should be selected according to the source of raw materials, production scale, environmental protection requirements and other factors. At the same time, with the continuous progress of science and technology and the improvement of environmental awareness, the development of more environmentally friendly, efficient and economical production methods will be the future development trend.

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