Method for preparing plasticizer by using purified terephthalic acid (PTA) residue

A plasticizer and residue technology, applied in the field of petrochemical industry, can solve the problems of cumbersome process and high post-processing cost, and achieve the effects of reduced process, high esterification rate and high catalytic activity

Inactive Publication Date: 2017-06-06
青州市瑞鑫再生资源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN03115282.1 discloses the method that utilizes PTA residue to prepare plasticizer, and its used catalyst is protonic acid such as concentrated sulfuric acid, p-toluenesulfonic acid or oxides such as stannous oxide; Therefore, can produce a large amount of waste acid, post-processing consumes big, complicated process
In summary, due to technical and economic reasons, PTA residues have not been well utilized comprehensively and need to be properly disposed of.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0030] In this example, the PTA residue is the solid waste generated from the industrial process of oxidizing p-xylene to terephthalic acid, and all other raw materials are commercially available.

[0031] The specific PTA residue of the present invention is Sinopec Corporation.

[0032] After analysis, the drying PTA residue components mainly include 2%-10% mass content of isophthalic acid, 10%-15% mass content of terephthalic acid, 2%-5% mass content of phthalic acid, 30%-40% by mass of benzoic acid, 25%-35% by mass of p-toluic acid, and <5% by mass of ash.

[0033] Add excess 0.5M sodium hydroxide solution to the PTA residue, stir at 40-80°C for 30-60min to completely dissolve the mixed benzoic acid components, cool and filter to recover the metal catalyst; adjust the filtrate to pH<7 with dilute sulfuric acid, mix the benzoic acid The formic acid component is completely precipitated, collected by filtration and dried at 80-90°C to obtain an alkali-dissolved precipitate. ...

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Abstract

The invention discloses a method for preparing a plasticizer by using purified terephthalic acid (PTA) residue. According to the method, the mixed benzoate plasticizer is prepared by taking the PTA solid residue as a raw material; the impurities such as a catalyst in the PTA residue are recycled, and the mixed benzoate plasticizer is prepared by enabling the PTA residue to have an esterification reaction with monohydric alcohol by using a one-pot method under the efficient catalysis of acidic ionic liquid. The ionic liquid used in the method can be recycled and has a good catalytic effect; the plasticizer is good in plasticizing performance, and can realize the efficient recycling of the PTA residue so as to change waste into valuable, thus having good economic benefit and social benefit.

Description

technical field [0001] The invention belongs to the field of petrochemical industry; in particular, it relates to petrochemical production, a method for recycling hazardous waste residues; and a method for producing mixed benzoate plasticizers by using acidic ionic liquid to catalyze terephthalic acid (PTA) waste. Background technique [0002] Terephthalic acid is an important petrochemical product, which is the main raw material for the production of polyester. There are many methods for industrially producing terephthalic acid, among which high-temperature oxidation of p-xylene is the most important production method (CN200510094468.2, CN201110288260.X). In the method, p-xylene is used as raw material, acetic acid is used as solvent, cobalt acetate and manganese acetate are used as catalysts, and PTA is oxidized at high temperature. [0003] The composition of PTA oxidation products is very complex, mainly including benzoic acid (BA), isophthalic acid (IPA), terephthalic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K5/101C08K5/12C08L27/06C08L21/00
CPCC08K5/101C08K5/12C08L27/06C08L21/00
Inventor 李宝军曹震胡燚余定华罗智青
Owner 青州市瑞鑫再生资源科技有限公司
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