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

A dibenzoylmethane and purification method technology, which is applied in the field of purification of sodium chloride by-product in the production of dibenzoylmethane, can solve the problems of environmental pollution, waste of sodium chloride resources, heavy odor, etc., and achieve low cost , the effect of solving environmental pollution

Inactive Publication Date: 2012-12-12
HUAINAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because this reaction is carried out in xylene solvent, so by-product sodium chloride solid particle surface adheres to have a certain amount of xylene and dibenzoylmethane, and smell is heavy, contains the sodium chloride of xylene and dibenzoylmethane By-products not only pollute the environment, but also waste sodium chloride resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Take 30g of sodium chloride, a by-product in the production of dibenzoylmethane, and put it into a clay container, and calcine it in a tunnel kiln at a temperature of 480°C for 25 minutes. After calcination, the solid is light gray and mixed with a small amount of black particles ;

[0016] (2) Dissolve the calcined solid in water to obtain a solution. Calculate the water consumption based on dissolving 35g of sodium chloride per 100g of water. Heat the solution with hot water or steam, keep the liquid temperature at 70°C, and let it stand for 1 hour to make diphenylmethane After acetylmethane is calcined, the residue precipitates and black particles float on the liquid surface, separate the lower sediment and the black particles floating on the liquid surface, and take the clear liquid;

[0017] (3) Concentrate and evaporate to a thick porridge in a falling film evaporator, then cool down to room temperature and crystallize;

[0018] (4) Centrifugal filtration to ...

Embodiment 2

[0020] (1) Take 100g of sodium chloride, a by-product in the production of dibenzoylmethane, and put it into a clay container, and calcine it in a tunnel kiln at a temperature of 500°C for 30 minutes. After calcination, the solid is light gray and mixed with a small amount of black particles ;

[0021] (2) Dissolve the calcined solid in water to obtain a solution. Calculate the water consumption based on dissolving 35g of sodium chloride per 100g of water. Heat the solution with hot water or steam, keep the liquid temperature at 80°C, and let it stand for 1 hour to make diphenylmethane After acetylmethane is calcined, the residue precipitates and black particles float on the liquid surface, separate the lower sediment and the black particles floating on the liquid surface, and take the clear liquid;

[0022] (3) Concentrate and evaporate to a thick porridge in a falling film evaporator, then cool down to room temperature and crystallize;

[0023] (4) Centrifugal filtration to...

Embodiment 3

[0025] (1) Take 200g of sodium chloride, a by-product of the production of dibenzoylmethane, and put it into a clay container, and calcinate it in a tunnel kiln at a temperature of 450°C for 30 minutes. After calcining, the solid is light gray and mixed with a small amount of black particles ;

[0026] (2) Dissolve the calcined solid in water to obtain a solution, calculate the water consumption according to dissolving 35g of sodium chloride per 100g of water, heat the solution with hot water or steam, keep the liquid temperature at 75°C, and let it stand for 1 hour to make diphenylmethane After acetylmethane is calcined, the residue precipitates and black particles float on the liquid surface, separate the lower sediment and the black particles floating on the liquid surface, and take the clear liquid;

[0027] (3) Concentrate and evaporate to a thick porridge in a falling film evaporator, then cool down to room temperature and crystallize;

[0028] (4) Centrifugal filtratio...

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PUM

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Abstract

The invention relates to a method for purifying by-product sodium chloride in dibenzoyl methane production. The method includes steps of, step one, using the by-product sodium chloride in the dibenzoyl methane production as a raw material, and calcining the by-product sodium chloride in a tunnel kiln at the temperature of 450-500 DEG C for 20-30 minutes; step two, placing solids obtained from the calcination into water for dissolving to obtain a solution, keeping the temperature of the solution to be 60-80 DEG C, standing the solution until calcined residues in the solution are precipitated and black particles float on the solution surface, separating lower layer precipitate and the black particles floating on the solution surface, and taking a clear liquor; step three, concentrating and steaming the clear liquor, and then performing cooling and crystallizing; and step four, performing centrifugal filtration to obtain crystal particles, and drying the crystal particles to obtain the finished sodium chloride.

Description

technical field [0001] The invention relates to a method for purifying by-products in the production of chemical products, in particular to a method for purifying sodium chloride, a by-product in the production of dibenzoylmethane. Background technique [0002] Dibenzoylmethane has a β-diketone structure and is an important light and heat stabilizer for thermoplastics. The product is non-toxic and tasteless, and is widely used in PVC plastics and ABS resins. Dibenzoylmethane has wide absorption and low transmittance to ultraviolet rays, and its ultraviolet absorption performance is better than that of commonly used benzophenones and benzotriazoles ultraviolet absorbers, and has good thermal stability, Chemical stability and photostability, non-toxic, tasteless, non-polluting products. [0003] The process route for the synthesis of dibenzoylmethane is to use methyl benzoate and acetophenone as raw materials, use ethanol / sodium ethylate as a catalyst, and use xylene as a sol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/14
Inventor 孙逸玫胡云虎
Owner HUAINAN NORMAL UNIV
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