Manufacturing method of cyclohexanol
Cyclohexanol is an important organic chemical raw material, widely used in the production of adipic acid, caprolactone, hexanediamine and other chemicals. This article will introduce the manufacturing method of cyclohexanol, including raw material selection, reaction principle, process flow, equipment selection and other aspects.
I. Raw material selection
The raw materials for the manufacture of cyclohexanol are mainly benzene, hydrogen, propylene and so on. Among them, benzene is the most commonly used raw material, because of its low price, wide range of sources and easy transportation and storage. Hydrogen is used as a reducing agent to reduce benzene to cyclohexane. Propylene is used as a raw material for carbonylating agent and reacts with cyclohexane to form cyclohexanol.
II. Reaction Principle
Cyclohexanol is manufactured mainly by two methods, hydrogenation and carbonylation. Hydrogenation method is to hydrogenate benzene with hydrogen under the action of catalyst to produce cyclohexane, and then cyclohexane is oxidized to cyclohexanol. Carbonylation method is to carry out carbonylation reaction between propylene and benzene under the action of catalyst to produce cyclohexanone, and then cyclohexanone is reduced to cyclohexanol.
III. Process flow
1. Hydrogenation process flow
The hydrogenation process flow includes the steps of hydrogenation reaction of benzene, oxidation reaction of cyclohexane, and refining of cyclohexanol. The specific process is as follows:
(1) After mixing benzene and hydrogen, it enters into the hydrogenation reactor and carries out the hydrogenation reaction under the action of catalyst to produce cyclohexane.
(2) Cyclohexane enters the oxidation reactor and undergoes oxidation reaction with oxygen under the action of catalyst to produce cyclohexanol and by-products.
(3) The cyclohexanol and by-products are separated by distillation, extraction and other separation methods to obtain a higher purity cyclohexanol product.
2. Carbonylation process flow
The carbonylation process flow includes the steps of carbonylation reaction of propylene and benzene, reduction reaction of cyclohexanone, and refining of cyclohexanol. The specific process is as follows:
(1) After mixing propylene and benzene, it enters into the carbonylation reactor and carries out the carbonylation reaction under the action of catalyst to produce cyclohexanone.
(2) Cyclohexanone enters the reduction reactor and undergoes a reduction reaction with hydrogen in the presence of a catalyst to produce cyclohexanol and by-products.
(3) Separate cyclohexanol and by-products by distillation, extraction and other separation methods to obtain higher purity cyclohexanol products.
Four, equipment selection
In the manufacturing process of cyclohexanol, the equipment to be used includes hydrogenation reactor, oxidation reactor, carbonylation reactor, reduction reactor, distillation tower, extraction tower and so on. When selecting the equipment, the reliability, efficiency and safety of the equipment need to be considered to ensure the smooth running of the production process.
V. Precautions
1. During the production process, the reaction temperature and pressure need to be strictly controlled to ensure the smooth running of the reaction and the quality of the product.
2. Regular maintenance and repair of production equipment is needed to ensure the normal operation and service life of the equipment.
3. When disposing of waste, it is necessary to comply with relevant environmental regulations and safety rules to avoid pollution of the environment.
In short, the manufacturing method of cyclohexanol needs to be selected and designed according to the specific production conditions and requirements to ensure the quality of the product and the economy of production. At the same time, relevant regulations and safety provisions need to be strictly observed during the production process to ensure the safety and environmental protection of the production.
