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Method for purifying sodium chloride as by-product in production of dibenzoyl methane

A technology of dibenzoylmethane and by-products, which is applied in the field of purification of by-product sodium chloride, can solve problems such as endangering the health of employees and secondary pollution, and achieves the effects of low labor intensity, easy operation and good energy saving effect.

Active Publication Date: 2014-10-08
ANHUI JIAXIAN FUNCTIONAL AUXILIARY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses organic solvents (xylene and methanol), which not only endangers the health of employees, but also produces secondary pollution

Method used

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Embodiment Construction

[0011] The task of the present invention is to purify the by-product sodium chloride produced in the dibenzoylmethane process, remove organic materials such as dibenzoylmethane, xylene, methyl benzoate in the salt, and only remove the organic materials , to be reused.

[0012] Purification method provided by the present invention divides following three steps:

[0013] 1. Preliminary purification: put the by-product sodium chloride into the neutralization tank that has been added with water in advance to form a suspension, and stop feeding when the solid-liquid mass ratio of the suspension reaches 1: (2~4), in order to improve the efficiency , preferably with a solid-to-liquid mass ratio of 1:2, use compressed air for air flotation and stirring to fully float the organic materials entrained in the salt layer, then use a vacuum storage tank to suck up the upper layer of organic materials, and then add alkali to the neutralization tank (liquid caustic soda or caustic soda) for ...

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Abstract

The invention discloses a method for purifying sodium chloride as a by-product in the production of dibenzoyl methane. The method comprises the following steps of (1) carrying out preliminary purification: putting sodium chloride as a by-product into a neutralization tank in which water is added in advance to form a turbid liquid, carrying out flotation stirring with compressed air, fully floating the organic materials entrained in the salt layer, pumping the floating organic materials, adding a base to the neutralization tank and adjusting the PH value to be 6-9; (2) carrying out flotation purification: pumping the neutralized turbid liquid into a flotation machine, and enabling the floating organic materials to overflow and return to the neutralization tank; and (3) carrying out precipitation separation purification: enabling the floated turbid liquid to automatically flow into a salt filter tank, precipitating the turbid liquid in the salt filter tank, enabling the supernatant to overflow and return to the neutralization tank, after the water in the salt layer is fully filtered, completely pumping the water in salt by virtue of a vacuum pump and carrying out natural drying or mechanical drying. The method disclosed by the invention has the advantages of convenience in operation, low labor intensity, no addition of an organic solvent and no generation of secondary pollution and the saturated brine is recycled.

Description

technical field [0001] The present invention relates to a method for purifying by-products in the production of chemical products, and in particular provides a method for purifying by-product sodium chloride, which is especially suitable for by-product sodium chloride (containing dibenzoylmethane Purification of toluene, dibenzoylmethane, methyl benzoate and hydrochloric acid, etc.). Background technique [0002] The by-product sodium chloride contains corrosive substances such as hydrochloric acid and organic substances such as xylene, methyl benzoate, and dibenzoylmethane. It has complex components and various colors. It cannot be used without further treatment and can only be disposed of as hazardous waste. It not only pollutes the environment and wastes resources, but also needs to pay more disposal fees, which affects the economic benefits of enterprises. [0003] Chinese patent CN102730721A discloses a method for recovering by-product salt: mixing industrial by-produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/14
Inventor 魏长亭黄先胜李海江朱明杰李平
Owner ANHUI JIAXIAN FUNCTIONAL AUXILIARY