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[Chemical Knowledge]：Manufacturing method and process of tripropylene glycol

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Tripropylene glycol (Tripropylene Glycol, referred to as TPG) is an important chemical raw material, widely used in coatings, inks, cleaning agents, plastics, cosmetics and other fields. This article will introduce the manufacturing method of tripropylene glycol in detail.

1. Raw Material Preparation

The main raw material for manufacturing tripropylene glycol is propylene oxide (Propylene, PO). Propylene oxide is a colorless transparent liquid, ether smell, flammable, toxic. Therefore, it is necessary to strictly control the safety operation in the production process.

2. Manufacturing Process

1. Propylene Oxide Hydrolysis Method: Propylene Oxide is hydrolyzed with water in the presence of an acidic catalyst to produce a mixture of propylene glycol and dipropylene glycol. The reaction equation is as follows:

PO H2O → PG H2O

where PO is propylene oxide and PG is propylene glycol.

2. propylene glycol catalytic dehydration method: propylene glycol is dehydrated in the presence of an acidic catalyst to produce a mixture of dipropylene glycol and tripropylene glycol. The reaction equation is as follows:

PG → DPG H2O
DPG → TPG H2O

where PG is propylene glycol, DPG is dipropylene glycol, and TPG is tripropylene glycol.

of the above two reaction processes can be carried out continuously, that is, propylene oxide is first hydrolyzed to produce propylene glycol, and then propylene glycol is catalytically dehydrated to produce tripropylene glycol. The specific operation process can be adjusted according to the actual situation of the production equipment.

3. separation and purification

reaction mixture contains unreacted raw materials, by-products and catalyst and other impurities, need to be separated and purified to obtain high purity tripropylene glycol products. Commonly used separation methods are distillation, extraction, crystallization, etc. The purification process requires the use of suitable materials such as solvents and adsorbents to remove impurities and improve product purity.

4. product quality control

In order to ensure the quality stability and reliability of tripropylene glycol products, it is necessary to conduct comprehensive monitoring of the production process and conduct strict quality inspections on the products. Commonly used detection indicators include purity, color, acidity, moisture and so on. For products that do not meet the standards, it is necessary to deal with and adjust the production process in time to ensure that the product quality meets the relevant standards and requirements.

5. safety and environmental protection measures

in the production process, need to strictly abide by the safety operation procedures to ensure the personal safety and health of employees. At the same time, it is necessary to strengthen the treatment and recycling of waste water, waste gas, waste residue and other wastes to reduce environmental pollution and harm.

In short, the manufacturing method of tripropylene glycol requires multiple steps and links, including raw material preparation, manufacturing process, separation and purification, product quality control, and safety and environmental protection measures. Only by fully mastering the key technologies and operation points of these links can we produce high-quality tripropylene glycol products to meet the needs of different fields.

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