Isohexylene glycol (Hexylene Glycol, abbreviated as HG) is an important chemical raw material, which is widely used in polyurethane, coatings, plastics, fibers and other fields. This article will introduce the manufacturing method of isohexylene glycol in detail, including raw material selection, reaction principle, process flow, equipment selection and other aspects.
I. Selection of raw materials
The raw materials for the manufacture of isohexanediol are mainly cyclohexane and hydrogen peroxide. Cyclohexane is a common organic compound with stable chemical properties and low toxicity, so it is widely used as a chemical raw material. Hydrogen peroxide is a strong oxidizing agent, which can oxidize cyclohexane to produce cyclohexanol and cyclohexanone, and then get isohexanediol by hydrogenation reaction.
II. Reaction Principle
The manufacturing reaction of isohexanediol mainly consists of two steps: oxidation reaction and hydrogenation reaction. The specific reaction principle is as follows:
1. Oxidation reaction: cyclohexane is oxidized to produce a mixture of cyclohexanol and cyclohexanone under the action of hydrogen peroxide.
2. Hydrogenation reaction: the mixture of cyclohexanol and cyclohexanone is hydrogenated to produce isohexanediol under the action of catalyst.
3. Process flow
The manufacturing process of isohexanediol mainly consists of the following steps:
1. Dosing: cyclohexane and hydrogen peroxide are added to the reactor in a certain proportion.
2. Oxidation reaction: Under appropriate temperature and pressure, oxidation reaction of cyclohexane and hydrogen peroxide occurs to produce a mixture of cyclohexanol and cyclohexanone.
3. Separation: The oxidation products are separated to obtain a mixture of cyclohexanol and cyclohexanone.
4. Hydrogenation: The mixture of cyclohexanol and cyclohexanone is fed into a hydrogenation reactor, where it undergoes a hydrogenation reaction in the presence of a catalyst to produce isohexanediol.
5. Refining: the product of hydrogenation reaction is refined to obtain isohexanediol product with high purity. In the manufacturing process of isohexanediol, the equipments to be used mainly include reactor, separator, hydrogenation reactor, refining equipment and so on. When selecting the equipment, it is necessary to make comprehensive consideration according to the production scale, product quality, operation safety and other factors, and select the suitable type and specification of the equipment.
V. Precautions for production operation
In the manufacturing process of isohexanediol, the following operational matters need to be noted to ensure production safety and product quality:
1. Strictly control the quality of raw materials and ratios, to ensure that the reaction is carried out smoothly.
2. Strengthen the maintenance and repair of equipment to ensure normal operation and service life of equipment.
3. Strictly carry out the operation rules and safety regulations to prevent accidents.
4. Conduct comprehensive monitoring and testing of the production process to ensure that the product quality meets the standard requirements.
In conclusion, the manufacturing method of isohexanediol involves a number of links and factors, which need to be considered and controlled comprehensively in the production process to ensure product quality and production safety.
