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Method for recovering fumaric acid from phthalic anhydride wastewater

A technology for waste water recovery and fumaric acid, which is applied in chemical instruments and methods, separation/purification of carboxylic acid compounds, preparation of carboxylate salts, etc.

Active Publication Date: 2014-02-05
KUNSHAN MAYMUSE ENVIRONMENTAL TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] Phthalic anhydride wastewater using naphthalene or not less than 30wt% naphthalene as raw material contains colored substances such as naphthoquinone. These colored substances are substances containing multiple double bond conjugated groups. These substances are slightly soluble in water and can only pass through activated carbon The effect of decolorization cannot be achieved, and the product is light red or light yellow, which cannot meet the requirements of feed grade fumaric acid

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  • Method for recovering fumaric acid from phthalic anhydride wastewater
  • Method for recovering fumaric acid from phthalic anhydride wastewater

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Embodiment Construction

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0030] In describing the present invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", " The orientation or positional relationship indicated by "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, so as to Specific orien...

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Abstract

The invention provides a method for recovering fumaric acid from phthalic anhydride wastewater. The method comprises the following steps: (1) settling the wastewater to obtain supernatant; (2) decolorizing the supernatant to obtain decolorized liquid, wherein the decolorization comprises active carbon adsorptive decolorization and electrolytic decolorization; (3) adding thiourea into the decolorized liquid to perform isomerization reaction and performing solid-liquid separation so as to obtain white fumaric acid. According to the method for recovering the fumaric acid from the phthalic anhydride wastewater provided by the embodiment of the invention, organic impurities, which are unlikely to be dissolved in water, in the phthalic anhydride wastewater can be effectively decomposed in combination with the active carbon adsorptive decolorization and the electrolytic decolorization when the phthalic anhydride wastewater is subjected to decolorization treatment, so that the fumaric acid which meets the feed-stage standard can be prepared.

Description

technical field [0001] The invention relates to a method for recovering fumaric acid from phthalic anhydride wastewater. Background technique [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. ...

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Application Information

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IPC IPC(8): C07C57/15C07C51/42
CPCC07C51/353C07C51/42C07C57/15
Inventor 左卫雄刘雅妮赵忠强
Owner KUNSHAN MAYMUSE ENVIRONMENTAL TECH
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