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[Chemical Knowledge]：Production method and process of hydrogenated xylene

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Xylene is an important chemical raw material, which is widely used in the production of plastics, resins, solvents and other fields. Hydrogenated xylene is an important derivative of xylene, which has higher chemical stability and thermal stability, so it is widely used in chemical reactions under extreme conditions such as high temperature, high pressure, strong acid, strong alkali and so on. This article will introduce the manufacturing method of hydrogenated xylene.

1. Feedstock Preparation

The main feedstocks for the manufacture of hydroxylenes are xylenes and hydrogen. Xylene is a colorless transparent liquid, aromatic, insoluble in water, miscible with alcohol, ether, acetone and other organic solvents. Hydrogen is a colorless, tasteless, odorless gas, insoluble in water, flammable and explosive.

2. reaction principle

hydrogenation of xylene manufacturing process is a catalytic hydrogenation reaction. Under the action of the catalyst, the addition reaction of xylene and hydrogen occurs to form hydrogenated xylene. The reaction is an exothermic reaction and it is desirable to control the reaction temperature to avoid excessive hydrogenation and catalyst deactivation.

3. Manufacturing Process
The manufacturing process of
hydrogenated xylene mainly includes the following steps:

1. Catalyst preparation: Select the appropriate catalyst and carry out pretreatment to improve the activity and selectivity of the catalyst.

2. Raw material mixing: xylene and hydrogen are mixed in a certain proportion and sent to the reactor.

3. Hydrogenation reaction: under the action of catalyst, xylene and hydrogen are added to produce hydrogenated xylene.

4. Product separation: After the reaction, the product is separated to obtain hydrogenated xylene with high purity.

5. Catalyst Regeneration: The used catalyst is subjected to a regeneration treatment to restore its activity.

4. precautions

1. Control the reaction temperature: The hydrogenation reaction is an exothermic reaction, and the reaction temperature needs to be controlled to avoid excessive hydrogenation and catalyst deactivation.

2. Ensure the activity of the catalyst: the activity of the catalyst has a great influence on the hydrogenation reaction, so it is necessary to select a suitable catalyst and carry out regeneration treatment regularly.

3. Safe operation: Because hydrogen is flammable and explosive, it is necessary to strictly abide by the safety operation procedures to ensure safety in the production process.

In short, the manufacturing process of hydrogenated xylene requires strict control of reaction conditions and operating processes to ensure product quality and production safety. At the same time, it is necessary to select the appropriate process and equipment according to the specific situation to improve production efficiency and economic benefits.

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