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[Chemical Knowledge]：Production and manufacturing method and process of octadecanol

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Manufacturing Method
of Octadecanol
1. Introduction

Octadecanol, also known as stearyl alcohol, is a long chain saturated fatty alcohol containing 18 carbon atoms. It has a wide range of applications in the field of chemical production raw materials, often used as emulsifiers, wetting agents, dispersants, thickeners and so on. This article will introduce the manufacturing method of octadecanol in detail.

2. Manufacturing Methods

1. Animal fat method

Animal fat method is one of the main methods for the production of octadecanol. The method uses animal fat as raw material, through saponification, acid hydrolysis, distillation and other steps to produce octadecanol. The specific steps are as follows:

(1) Saponification: mixing animal fat with aqueous sodium hydroxide solution, heating to boiling, and performing saponification reaction to generate soap and glycerin.

(2) Acidolysis: The saponification is subjected to acid hydrolysis with sulfuric acid to produce free fatty acids and sodium sulfate.

(3) Distillation: The acid hydrolysis product is distilled, and the fraction of 170-180°C is collected, which is octadecanol.

2. vegetable oil method

vegetable oil method is also one of the common methods for the production of octadecanol. The method takes vegetable oil as raw material, and produces octadecanol through the steps of hydrogenation, saponification, acidolysis and distillation. The specific steps are as follows:

(1) Hydrogenation: Hydrogenation of vegetable oils and fats to convert unsaturated fatty acids into saturated fatty acids.

(2) Saponification: The hydrogenated vegetable oil and fat is mixed with an aqueous sodium hydroxide solution, heated to boiling, and subjected to a saponification reaction to produce soap and glycerin.

(3) Acidolysis: The saponification is subjected to acid hydrolysis with sulfuric acid to produce free fatty acids and sodium sulfate.

(4) Distillation: The acid hydrolysis product is distilled, and the fraction of 170-180°C is collected, which is octadecanol.

3. Petrochemical process

Petrochemical process is a method of producing octadecanol using petrochemical products as raw materials. The method usually takes paraffin or wax oil as raw material, and produces octadecanol through catalytic hydrogenation, hydrolysis, distillation and other steps. The specific steps are as follows:

(1) Catalytic hydrogenation: a catalyst is added to paraffin or wax oil, and a hydrogenation reaction is carried out to generate saturated hydrocarbons.

(2) Hydrolysis: Saturated hydrocarbons react with water under acidic conditions to produce alcohols and acids.

(3) Distillation: The hydrolysis product is distilled, and the fraction at 170-180°C is collected, I .e., octadecanol.
Precautions for
3.

1. In the production process, it is necessary to strictly control the reaction conditions and operation process of each step to ensure product quality and output.

2. When using sulfuric acid for acidolysis, it is necessary to pay attention to safety and avoid spilling sulfuric acid to hurt people.

3. During the distillation process, it is necessary to keep the equipment airtight to avoid product leakage and environmental pollution.

4. Conclusion There are many methods for the manufacture of

octadecanol, including animal fat method, vegetable oil method and petrochemical method. Different methods have different advantages and disadvantages and scope of application, and suitable methods can be selected for production according to the actual situation. In the production process, it is necessary to pay attention to safety, environmental protection and quality control issues to ensure product quality and output.

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