Method for preparing environment-friendly plasticizer DOTP from waste white mud

An environmentally friendly plasticizer and waste technology, applied in the field of preparing environmentally friendly plasticizer DOTP, can solve the problems of white mud occupying land resources, surface weathering and dust pollution, and achieve the effect of broad application prospects

Inactive Publication Date: 2020-02-07
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The white mud piled up for a long time occupies a large amount of land resources, and the weathering of the surface will cause dust pollution

Method used

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  • Method for preparing environment-friendly plasticizer DOTP from waste white mud
  • Method for preparing environment-friendly plasticizer DOTP from waste white mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Esterification reaction: Add 24.92g of dried acid-treated waste lime mud and 68.37g of 2-ethylhexanol into a three-necked flask, wherein the molar ratio of white mud: 2-ethylhexanol is 1 : 3.5; continue to add catalyst tetrabutyl titanate 0.93g; heat the electric heating mantle to 220°C, measure the acid value of the system after constant temperature reaction for 8 hours, if the acid value is less than 1mg KOH / g, stop the reaction, and pump under -0.1MPa after cooling Filter for 3 hours; if it is greater than 1mg KOH / g, continue the esterification reaction;

[0025] (2) Neutralizing water washing: use 5% Na under the condition of heating in a water bath at 70°C 2 CO 3 The solution neutralizes the above filtrate until the acid value is less than 0.1mgKOH / g, washes it with water several times, and after standing still for 24 hours, take the upper layer solution;

[0026] (3) Dealcoholization: the upper layer solution, that is, the ester layer, was placed in a round-...

Embodiment 2

[0031] (1) Esterification reaction: add dried acid-treated lime mud, 2-ethylhexanol and tetrabutyl titanate into a three-necked flask, and the molar ratio of waste lime mud: 2-ethylhexanol is 1:6; the amount of catalyst added is 3% of the total mass of waste lime mud and 2-ethylhexanol; the electric heating mantle is heated to 260°C, and the acid value of the system is measured after 7 hours of constant temperature reaction. If the acid value is less than 1mg KOH / g , stop the reaction, suction filter at -0.1MPa after cooling; if it is greater than 1mg KOH / g, continue the esterification reaction;

[0032] (2) Neutralizing water washing: use 5% Na under the condition of heating in a water bath at 90°C 2 CO 3 The solution neutralizes the above filtrate until the acid value is less than 0.1mgKOH / g, washes it with water several times, and after standing still for 24 hours, take the upper layer solution;

[0033] (3) Dealcoholization: put the upper solution, that is, the ester lay...

Embodiment 3

[0036] (1) Esterification reaction: add dried acid-treated lime mud, 2-ethylhexanol and tetrabutyl titanate into a three-necked flask, and the molar ratio of waste lime mud: 2-ethylhexanol is 1:2; the amount of catalyst added is 1% of the total mass of waste lime mud and 2-ethylhexanol; the electric heating mantle is heated to 200°C, and the acid value of the system is measured after constant temperature reaction for 8 hours. If the acid value is less than 1mg KOH / g , stop the reaction, suction filter at -0.1MPa after cooling; if it is greater than 1mg KOH / g, continue the esterification reaction;

[0037] (2) Neutralizing water washing: use 5% Na under the condition of heating in a water bath at 60°C 2 CO 3 The solution neutralizes the above-mentioned filtrate; after the acid value is less than 0.1mgKOH / g, it is washed with water several times, and after standing still for 24 hours, the upper layer solution is taken;

[0038] (3) Dealcoholization: put the upper solution, tha...

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Abstract

The invention discloses a method for preparing an environment-friendly plasticizer DOTP from waste white mud, and belongs to the technical field of high-valued cyclic utilization of waste, synthesis of fine chemicals and application of plastic additives. According to the invention, acid-treated waste white mud and 2-ethylhexanol are used as main raw materials, molecular structure transformation and functional group conversion are carried out through esterification, neutralization washing, dealcoholization and decoloration, and the environment-friendly plasticizer DOTP is prepared. The method provided by the invention not only solves the treatment problem of the waste white mud, but also turns waste into wealth, and the obtained product DOTP is listed as a non-toxic plasticizer, can completely replace o-benzene plasticizers, has dual benefits of economy and environmental protection, and is wide in application prospect.

Description

technical field [0001] The invention relates to a method for preparing environmentally friendly plasticizer DOTP by using waste white mud, and belongs to the technical fields of high-value recycling of waste, synthesis of fine chemicals and application of plastic additives. Background technique [0002] White mud refers to the waste liquid and waste residue produced in the production of chlor-alkali industry. With the rapid development of industry in recent years, more and more white mud is produced. Because it cannot be processed, a large amount of white mud is naturally piled up or directly discharged into the sea. The white mud piled up for a long time occupies a large amount of land resources, and the weathering of the surface will cause dust pollution. Therefore, the treatment of lime mud and turning waste into wealth have obvious social and economic benefits, and have a broad prospect. [0003] Dioctyl terephthalate DOTP is a plasticizer for polyvinyl chloride (PVC) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C69/82C08K5/12C08L27/06
CPCC07C67/08C08K5/12C08L27/06C07C69/82
Inventor 蒋平平王涵颖高巍张琪芳
Owner JIANGNAN UNIV
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