A kind of method for removing organic impurities in 2-ethylanthraquinone production waste sulfuric acid water

Abstract

The invention novelly discloses a method for removing organic impurities in 2-ethylanthraquinone waste sulfuric acid water. The waste acid water for producing 2-ethylanthraquinone is subjected to rough filtration to remove organic particles and parts such as anthraquinone that are insoluble in the acid water. For tar, salting out and coagulation separation methods are used to separate organic mixtures such as anthraquinone derivatives, tar, benzoic acid and benzene derivatives soluble in acid water from magnesium sulfate solution. In a high-salt environment, the coagulant coagulation method is used to coagulate the organic matter into a group, and the solution is formed in the separation tank below, and the solid oil is condensed on the top, and the solution is discharged from the discharge valve at the bottom of the separation tank while it is hot. Cooling crystallization and centrifugation, and centrifuging the purified mother liquor and solid magnesium sulfate from which the organic mixture was separated. There is no need to concentrate the waste acid water at high temperature and then quench it to room temperature to solidify and separate out organic impurities, save steam, and do not require complex oxidation and removal of organic matter. The simple, effective and economical recycling of acid water containing organic waste is realized.

Description

technical field [0001] The invention relates to the removal of organic impurities when the waste sulfuric acid water produced by the production of 2-ethyl anthraquinone is recycled and utilized, and the method for separating the organic impurity mixture from the magnesium sulfate solution. Method for separating organic impurity mixture from mother liquor. Background technique [0002] During the synthesis and production of 2-ethylanthraquinone, a large amount of organic impurity sulfuric acid wastewater containing anthraquinone, anthraquinone derivatives, tar, benzoic acid and benzene derivatives (mainly benzene sulfonate) is produced. This wastewater must be treated in a harmless manner. processing. The most economical and effective method at present is to use magnesium oxide and acid water to neutralize the production of magnesium sulfate, but the organic impurities in the acid water have a great influence on the solution filtration process of the production process of ma...

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Problems solved by technology

[0003] Aiming at the problems of incomplete precipitation, high steam consumption, high equipment maintenance cost (enamelling equipment is quenched at high temperature, easy to break) and affecting the continuous production of the organic impurity mixture precipitated by rapid cooling and solidification of high-temperature distillation, a salting-out plus coagulant was invented to coagulate and separate the organic mixture The method does not need steam, the separation effect is good, and the long-term recycling of magnesium sulfate mother liquor is achieved, which does not affect the continuous production of magnesium sulfate produced from waste acid, and ensures the product quality of magnesium sulfate heptahydrate

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