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Refining method of cyclohexane dicarboxylates plasticizer

A technology of cyclohexanedicarboxylic acid and ester plasticizers, which is applied in the direction of carboxylate preparation, carboxylate separation/purification, chemical instruments and methods, etc., and can solve high energy consumption, large alkali washing wastewater, process To solve problems such as long process, achieve the effect of increasing purity, improving acid value and chroma, and shortening the refining process

Active Publication Date: 2017-05-31
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of long process flow, high energy consumption and large amount of alkaline washing wastewater in the prior art, the present invention provides a method for refining cyclohexanedicarboxylate plasticizers

Method used

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  • Refining method of cyclohexane dicarboxylates plasticizer
  • Refining method of cyclohexane dicarboxylates plasticizer

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Experimental program
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specific Embodiment

[0015] The raw material properties are shown in Table 1:

[0016] Table 1 Composition of hydrogenation products of phthalate plasticizers

[0017]

Embodiment 1

[0019] The raw material is the direct hydrogenation product of DEHP, the content of diisooctyl 1,2-cyclohexanedicarboxylate is 98.26%, the content of alcohol and other impurities is 1.52%, the content of water is 0.22%, the acid value is 1.5mgKOH / g, and the color of platinum-cobalt 35. The DEHP hydrogenation product is heated to 150°C and then enters the dealcoholization tower, and steam stripping is used. The steam stripping temperature is 150°C, the ratio of steam volume to material volume is 1:10, and the pressure at the top of the tower is 15kPaA. The bottom of the tower is extracted into the dehydration tower, the material inlet temperature is 143°C, and the pressure at the top of the dehydration tower is 12kPaA. After flash dehydration, the material enters the refining reactor. The upper part of the refining reactor is filled with modified alkaline clay; the lower part is filled with shell-type activated carbon. The operating conditions of the refining reactor are: react...

Embodiment 2

[0021] The raw material is the direct hydrogenation product of DIBP, the content of diisobutyl 1,2-cyclohexanedicarboxylate is 97.82%, the content of alcohol and other impurities is 1.93%, the content of water is 0.25%, the acid value is 1.8mgKOH / g, and the color of platinum-cobalt 38. The DIBP hydrogenation product is heated to 140°C and then enters the dealcoholization tower, and steam stripping is used. The steam stripping temperature is 150°C, the ratio of steam volume to material volume is 1:12, and the pressure at the top of the tower is 15kPaA. The bottom of the tower is extracted into the dehydration tower, the material inlet temperature is 137°C, and the pressure at the top of the dehydration tower is 12kPaA. After flash dehydration, the material enters the refining reactor. The upper part of the refining reactor is filled with modified alkaline clay, and the lower part is filled with shell-type activated carbon. The operating conditions of the refining reactor are: r...

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Abstract

The invention discloses a refining method of a cyclohexane dicarboxylates plasticizer. The refining method comprises the following steps: (1) introducing a phthalates plasticizer hydrogenated mixed product into a dealcoholization tower to remove little alcohols and other light-component impurities; (2) introducing a dealcoholized product into a dehydrating tower to remove little water; and (3) enabling a dehydrated material to enter a refining reactor to perform deacidification and discoloration, wherein the refining reactor is divided into two bed layers, an upper bed layer is filled with modified carclazyte, the lower bed layer is filled with active carbon, and operation conditions of the refining reactor are as follows: the reaction temperature is 70 to 120 DEG C, the normal pressure is adopted, the volume air velocity is 0.5 to 2.0 h<-1>, the purity of the refined cyclohexane dicarboxylates plasticizer is greater than 99.9 percent, the acid value is less than 0.07 mg KOH / g, the water content is less than 0.02 percent, and the chromaticity of platinum-cobalt is less than 30. The method is used for purifying phthalates hydrogenated products and has the characteristics of high product purity, short process flow and no emission of alkaline washing waste water.

Description

technical field [0001] The invention belongs to the field of plasticizer production, in particular to a method for refining cyclohexanedicarboxylate plasticizers. [0002] technical background [0003] Phthalate plasticizers are widely used all over the world due to their good plasticizing properties. However, in recent years, there have been frequent reports on the potential carcinogenicity of its leached substances to the human body, which has aroused people's attention to the use of this type of plasticizer. With the promulgation of policies and regulations on banning and restricting the addition of o-phthalic plasticizers in the European Union, Japan, and the United States, the plastic product industry has to look for more non-toxic and environmentally friendly plasticizer substitutes. Cyclohexane dicarboxylate plasticizer is a new type of environmentally friendly plasticizer product, which can be prepared from phthalate plasticizer through benzene ring hydrogenation rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/48C07C67/54C07C67/56C07C69/75
CPCC07C67/48C07C67/54C07C67/56C07C69/75
Inventor 孙国方李孝国于海斌郑修新刘有鹏赵甲高鹏费亚南李佳臧甲忠刘艳张健
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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