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A pretreatment method for recovering fumaric acid from naphthalene phthalic anhydride wastewater

A technology for recovering naphthalene phthalic anhydride and waste water, which is applied in chemical instruments and methods, separation/purification of carboxylic acid compounds, preparation of carboxylate, etc. It can solve the problems of occupying activated carbon and affecting the adsorption effect

Active Publication Date: 2016-07-06
TAIXING XIELIAN ZHONGDA CHEM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Another reason why a large amount of activated carbon is needed is that the waste water contains tar substances, which occupy the pores of activated carbon and affect the adsorption effect.

Method used

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  • A pretreatment method for recovering fumaric acid from naphthalene phthalic anhydride wastewater
  • A pretreatment method for recovering fumaric acid from naphthalene phthalic anhydride wastewater

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Embodiment 2-8

[0020] A pretreatment method for recovering fumaric acid from naphthalene-based phthalic anhydride wastewater, comprising the steps of: 1) adding a flocculant to the naphthalene-based phthalic anhydride wastewater to carry out flocculation and sedimentation to obtain a supernatant; 2) distilling the supernatant Concentrate to obtain a concentrated liquid. The concentrated liquid is cooled to room temperature and then left to stand for 30-100 hours. After the solid settles, the supernatant is used for subsequent processing. The flocculant is cationic polyacrylamide, the dosage is 0.05-0.5% of the weight of naphthalene-based phthalic anhydride wastewater, the time of flocculation and precipitation is 10-40 hours, the method of distillation and concentration is double-effect evaporation, and the vacuum degree of evaporation is 85-105%. The boiling point is 50-100°C, and the concentrated acid water concentration is 20-28%.

[0021] Table 1. The concrete parameters of embodiment 1~...

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Abstract

The invention provides a pretreatment method for recovering fumaric acid from naphthalene-process phthalic anhydride wastewater, which comprises the following steps: 1) adding a flocculant into the wastewater, and settling to obtain a supernate; and 2) carrying out distillation concentration on the supernate to obtain a concentrated solution, cooling the concentrated solution to normal temperature, standing for some time to settle the solid, and sending the supernate to the subsequent wastewater treatment process. The method provided by the embodiment of the invention greatly lowers the activated carbon consumption in the subsequent treatment.

Description

technical field [0001] The invention relates to a method for recovering fumaric acid from phthalic anhydride wastewater. technical background [0002] The raw material for the production of phthalic anhydride is o-xylene or naphthalene, and the other raw material is oxygen. During the reaction, about 3% of the by-product of maleic acid will be generated, accompanied by other by-products. These by-products are sprayed with water in the tail gas tower of the phthalic anhydride plant, which is phthalic anhydride wastewater. [0003] Using thiourea as a catalyst, maleic acid can be isomerized into fumaric acid, namely fumaric acid. Fumaric acid can be used as feed or food additive, and has a wide range of uses. However, since phthalic anhydride wastewater contains other colored substances, the phthalic anhydride wastewater needs to be decolorized during the recovery of fumaric acid. At present, activated carbon is commonly used to decolorize phthalic anhydride wastewater. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C57/15C07C51/42C07C51/487C07C51/50C07C51/47
CPCC07C51/42C07C51/47C07C51/50C07C57/15
Inventor 张国华谈柱林周斌张智慧周勇成
Owner TAIXING XIELIAN ZHONGDA CHEM CO LTD