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Preparation method of rubber plasticizer dicapryl phthalate

A technology of dioctyl phthalate and rubber plasticizer, which is applied in the field of rubber plasticizer preparation, can solve the problems of waste liquid pollution, many side reactions, equipment corrosion, etc., and achieve high catalytic activity and convenient operation , the effect of reducing corrosion

Inactive Publication Date: 2015-05-06
QINGDAO WANGYU RUBBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the production processes at home and abroad are produced by concentrated sulfuric acid catalytic esterification. Using concentrated sulfuric acid as a catalyst has long reaction time, many side reactions, low product yield, poor product quality, serious equipment corrosion, and a large amount of waste liquid. polluted environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0015] 1. In a three-neck flask equipped with a thermometer, reflux condenser and water separator, add phthalic anhydride, isooctyl alcohol, p-toluenesulfonic acid and toluene in sequence, mix well, and heat up to 140°C-150°C. Reflux reaction for 1.5h;

[0016] 2. After the reaction is completed, cool down, wash with saturated brine until neutral, add activated carbon to the crude product, distill under reduced pressure, and collect fractions to obtain dioctyl phthalate.

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PUM

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Abstract

The invention discloses a preparation method of a rubber plasticizer dicapryl phthalate. The method includes the following steps: 1, sequentially adding phthalic anhydride, isooctyl alcohol, p-toluenesulfonic acid and toluene into a three-neck flask equipped with a thermometer, a reflux condensing tube and a water separator, evenly mixing, heating to 140 DEG C to 150 DEG C, and conducting reflux reaction for 1.5 h; and 2, after the reaction, cooling, washing the reaction product with saturated salt solution to a neutral state, adding activated carbon to the crude product, conducting reduced pressure distillation, and collecting the fraction to obtain dicapryl phthalate. The preparation method provided by the invention employs toluenesulfonic acid as the esterification catalyst for synthesis of dicapryl phthalate, and the toluenesulfonic acid has the advantages of high catalytic activity, good selectivity, convenient operation, great reduction on the corrosion to the equipment, less pollution, green and environment-friendliness.

Description

[0001] technical field [0002] The invention relates to a method for preparing a rubber plasticizer, in particular to a method for preparing dioctyl phthalate. [0003] Background technique [0004] Dioctyl phthalate is a phthalate plasticizer, and it is the most widely used plastic and rubber general-purpose plasticizer at home and abroad. Its performance is excellent, and its total consumption has accounted for 85% of the total consumption of plasticizers. %about. At present, most of the production processes at home and abroad are produced by concentrated sulfuric acid catalytic esterification. Using concentrated sulfuric acid as a catalyst has long reaction time, many side reactions, low product yield, poor product quality, serious equipment corrosion, and a large amount of waste liquid. polluted environment. [0005] Contents of the invention [0006] The object of the present invention is to provide a method for preparing rubber plasticizer dioctyl phthalate, whi...

Claims

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Application Information

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IPC IPC(8): C07C69/80C07C67/08
CPCC07C67/08
Inventor 梁松杰
Owner QINGDAO WANGYU RUBBER