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[Chemical Knowledge]：The production and manufacturing method and process of decanediol.

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Decylene Glycol (DG) is a kind of raw material widely used in the field of chemical production, with excellent moisture retention, solubility and stability. In the process of producing decanediol, mainly used methods include esterification, reduction and biological methods. This article will detail these manufacturing methods and operating points.

1. Esterification method

esterification method is one of the common methods for manufacturing decanediol, mainly through esterification reaction to convert capric acid and ethylene glycol into decanediol. The following are the specific steps for manufacturing decanediol by the esterification method:

(1) capric acid and ethylene glycol are added into a reactor in a molar ratio of 1:2, and an appropriate amount of catalyst (such as sulfuric acid or p-toluenesulfonic acid) is added.

(2) In a reactor, capric acid and ethylene glycol are sufficiently reacted with heating and stirring to produce a mixture of ethylene glycol caprate and water. The mixture is distilled

(3) to separate ethylene glycol decanoate and water, and the ethylene glycol decanoate is collected.

(4) Ethylene glycol decanoate is charged into another reactor, hydrogen and a catalyst are added, and a reduction reaction is carried out to produce a mixture of decanediol and water. The

(5) is again distilled to separate the decanediol and water and collect the decanediol product.

operation points: In the esterification reaction, it is necessary to control the reaction temperature and the amount of catalyst to ensure the smooth progress of the reaction. In the reduction reaction, it is necessary to control the pressure and flow rate of hydrogen to ensure the complete reduction reaction. In addition, it is necessary to control the pH value during the entire process to avoid corrosion of the equipment.

2. Reduction Method
The
reduction method is a method by reducing ethyl decanoate to decanediol. The following are the specific steps for producing decanediol by the reduction method:

(1) Ethyl decanoate is added to the reactor, and an appropriate amount of catalyst (such as copper chromium oxide or nickel catalyst) is added.

(2) Hydrogen gas was introduced into the reactor, and the mixture was heated and stirred to reduce ethyl decanoate to decanediol.

(3) After completion of the reaction, the reaction solution was cooled to room temperature, and the catalyst was filtered off to obtain a decanediol product.

operation points: In the reduction reaction, the pressure and flow rate of hydrogen need to be controlled to avoid excessive reduction or incomplete reduction. In addition, it is necessary to select an appropriate catalyst and control the reaction temperature and time to improve the purity and yield of the product.

3. Biological Method

The biological method is a method of producing decanediol by microbial fermentation. The following are the specific steps of the biological method for manufacturing decanediol:

(1) Add glucose, yeast extract, phosphate and other nutrients into the fermentation tank, and inoculate decanediol producing bacteria.

(2) is fermented under suitable conditions to allow microorganisms to convert glucose to decanediol.

(3) The bacterial cells and the fermentation broth are separated by centrifugation or filtration to obtain a decanediol product.

operation points: in the biological method, it is necessary to select the appropriate strain and fermentation conditions, in order to improve the yield and purity of decanediol. In addition, it is necessary to control the pH value, temperature and dissolved oxygen during the fermentation process to ensure the smooth progress of the fermentation.

In short, methods for producing decanediol include an esterification method, a reduction method, a biological method, and the like. Different methods have different advantages and disadvantages and scope of application, and the selection of the appropriate method needs to be determined according to the specific product requirements and production conditions. In the operation process, it is necessary to pay attention to the control of various parameters to ensure the quality and yield of the product.

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