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Production method for preparing environment-friendly plasticizer by adopting continuous method

An environment-friendly, plasticizer technology, applied in the preparation of carboxylate, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of large area of ​​the reactor, limited application scope, uncontinuous esterification reaction, etc.

Pending Publication Date: 2021-04-20
南京中设石化工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention mainly solves the technical problems such as inability to continue the esterification reaction in the past, taking up a large area of ​​the reactor, and limited application range, and provides a method for preparing an environment-friendly plasticizer by the continuous esterification method

Method used

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  • Production method for preparing environment-friendly plasticizer by adopting continuous method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Control the molar ratio of terephthalic acid and isooctyl alcohol entering the configuration kettle 3 to 1:1.5, the temperature of isooctyl alcohol entering the configuration kettle 3 is 160°C, and the raw material reaction liquid in the configuration kettle 3 is maintained at 160°C. The prepared raw material reaction solution is mixed with the catalyst tetrabutyl titanate to form a mixed raw material solution, and the tetrabutyl titanate is 0.25% of the mass of terephthalic acid. The mixed raw material liquid and the first-stage reaction liquid are mixed and enter the first-stage reaction liquid heater 13 to be heated to 230°C, and then enter the clapboard tower reactor 7 and disperse on the filler a through the liquid distributor d at the top of the first-stage reaction chamber. Circulating iso-octanol enters the middle of the reaction chambers at all levels and disperses to the liquid surface of the reaction chamber through liquid nozzle b. The molar ratio of circulat...

Embodiment 2

[0033] Control the molar ratio of trimellitic anhydride and isopropanol entering the configuration kettle 3 to 1:4, the temperature of isooctyl alcohol entering the configuration kettle 3 is 75°C, and the raw material reaction liquid in the configuration kettle 3 is maintained at 75°C. The prepared raw material reaction liquid is mixed with the catalyst tetraisopropyl titanate to form a mixed raw material liquid, and the tetraisopropyl titanate is 0.30% of the mass of trimellitic anhydride. The mixed raw material liquid and the first-stage reaction liquid are mixed and enter the first-stage reaction liquid heater 13 to be heated to 190°C, and then enter the clapboard tower reactor 7 and disperse on the filler a through the liquid distributor d at the top of the first-stage reaction chamber. Circulating isopropanol enters the middle of the reaction chambers at all levels and disperses to the liquid surface of the reaction chamber through liquid nozzle b. The molar ratio of circu...

Embodiment 3

[0035]The molar ratio of phthalic acid and n-butanol entering the configuration kettle 3 is controlled to be 1:2, the temperature of isooctyl alcohol entering the configuration kettle 3 is 100°C, and the raw material reaction liquid in the configuration kettle 3 is maintained at 100°C. The prepared raw material reaction liquid is mixed with the catalyst tetrabutyl titanate to form a mixed raw material liquid, and the tetrabutyl titanate is 0.75% of the mass of trimellitic anhydride. The mixed raw material liquid and the first-stage reaction liquid are mixed and enter the first-stage reaction liquid heater 13 to be heated to 210°C, and then enter the clapboard tower reactor 7 and disperse on the filler a through the liquid distributor d at the top of the first-stage reaction chamber. Circulating n-butanol respectively enters the middle of the reaction chamber at each stage and disperses to the liquid surface of the reaction chamber through the liquid nozzle b. The molar ratio of...

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Abstract

The invention relates to a production method for preparing an environment-friendly plasticizer by adopting a continuous method, which comprises the following steps: reacting benzoic acid with alcohol in the presence of a catalyst to obtain a benzoate plasticizer, and is characterized by comprising the following steps: mixing solid granular or blocky raw material benzoic acid with alcohol to obtain a raw material reaction solution; mixing and heating raw material reaction liquid, a catalyst and first-stage reaction liquid to 160-250 DEG C and allowing the raw material reaction liquid, a catalyst and first-stage reaction liquid to enter the top of a first-stage reaction cavity of a partition plate tower reactor, introducing alcohol from the middle of each stage of reaction cavity of the tower reactor to be subjected to esterification reaction with reaction mixed liquid, and externally and circularly heating each stage of reaction liquid to 160-250 DEG C to maintain the reaction temperature, wherein unreacted alcohol at each stage and water generated by reaction are vaporized, are collected and discharged at the top of the partition plate tower reactor, and are condensed, layered and separated; and enabling crude ester discharged from the bottom of the fourth-stage reaction chamber to be subjected to post-treatment to obtain a plasticizer product. According to the invention, continuous production of the environment-friendly plasticizer is realized in a manner of series connection of multiple stages of reaction cavities in the partition plate tower type reactor, and the method has the characteristics of safety, high efficiency, high automation degree, small occupied area and energy conservation.

Description

technical field [0001] The invention relates to the technical field of environment-friendly plasticizers, in particular to a method for preparing environment-friendly plasticizers by continuous esterification. Background technique [0002] At present, most plasticizers are produced in a semi-continuous manner, that is, the esterification process adopts a batch type, and the processes after esterification (neutralization, washing, dealcoholization, decolorization, filtration, etc.) adopt a continuous type. The esterification reaction is carried out in a reactor, which is heated with a jacket and has a stirred mixed material. The water generated by the esterification reaction is removed by the entrainer, and the material is fed and discharged intermittently. Compared with continuous production, this reaction method has high labor intensity, easy fluctuation of product quality, high energy consumption and low degree of automation. [0003] Patent CN202366684U discloses a conti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C69/82C07C69/80C07C67/12C07C69/76
Inventor 陈英戴哲彦程享葛建红
Owner 南京中设石化工程有限公司
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