Production process and system for preparing cyclohexane plasticizer through liquid phase hydrogenation of orthophthalic plasticizer

Abstract

The invention relates to the technical field of plasticizer production, in particular to a production process and system for preparing a cyclohexane plasticizer through liquid phase hydrogenation of an orthophthalic plasticizer. The production system for preparing the cyclohexane plasticizer through liquid phase hydrogenation of the orthophthalic plasticizer comprises a preheater, a pump, a tubular fixed bed reactor and a material conveying pipe, materials are mixed according to the proportion, then enter the preheater, are preheated to a preset value through the preheater, and are pumped into tubes of the tubular fixed bed reactor through the pump along the material conveying pipe for reaction. The system further comprises a water inlet pipe, a first control valve, a heat exchanger, a second control valve, a third control valve and a temperature monitoring device. The temperature monitoring device is configured to act to open the first control valve when the temperature in the tubular fixed bed reactor rises to exceed a first preset value, act to open the second control valve when the temperature continues to rise to exceed a second preset value, and act to close the third control valve when the temperature continues to rise to exceed a third preset value; and materials are prevented from entering.

Description

technical field [0001] The invention relates to the technical field of plasticizer production, in particular to a production process and system for producing cyclohexane plasticizers through liquid-phase hydrogenation of ortho-benzene plasticizers. Background technique [0002] Ophthalmic plasticizers are an important class of chemical product additives, which are widely used as additives in plastic products, concrete, plaster, cement, gypsum, cosmetics and cleaning agents. Due to its potential toxicity, o-phthalic plasticizers are usually hydrogenated under certain conditions in industrial production to produce harmless cyclohexane plasticizers. [0003] The reaction of liquid-phase hydrogenation of o-phthalic plasticizers to cyclohexane plasticizers is a strongly exothermic reaction, and an appropriate reaction temperature range helps to reduce the generation of by-products, so the control of the reaction temperature is very critical. For the tubular fixed-bed reactor, th...

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Problems solved by technology

[0004] The invention provides a production process and system for producing cyclohexane plasticizers through liquid-phase hydrogenation of ortho-benzene plasticizers. The system adopts a mechanical temperature monitoring device to solve the problem of existing liquid-phase hydrogenation of ortho-benzene plasticizers. The problem of low production efficiency and high cost of replacement in the production system of cyclohexane plasticizers

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