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Method for purifying biphenyl by solventing-out crystallization

A technology for dissolving crystallization and biphenyl, applied in the field of coal chemical industry, can solve the problems of high cost, difficult to effectively solve the problems of impurity adhesion and coercion, low yield, etc., achieving low production cost, solving adhesion and coercion, and convenient operation. simple effect

Active Publication Date: 2009-07-01
BAOWU CHARCOAL MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of process step is simple, easy to operate, the product purity can reach more than 99% biphenyl dissolution and crystallization separation and purification method, solve the problem that existing biphenyl purification method is difficult to effectively solve the impurity in the crystal Sticking and coercion and technical issues of low yield and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Add 25 grams of raw materials with a biphenyl content of 71.2% into 67.5 grams of 95% ethanol solution, mix thoroughly at 40°C, and cool the mixture to 15°C. Then, 13.5 grams of water was added dropwise to the mixed solution while stirring, and after the dropwise addition was completed, the constant temperature stirring was continued for 10 minutes. Filtration and drying yielded 10.6 g of solid with a purity of 99.08% and a yield of 59%.

Embodiment 2

[0015] 25 grams of raw materials with a biphenyl content of 75.8% were added to 100 grams of absolute ethanol, mixed thoroughly at 35°C, and then the mixture was cooled to 5°C. Then, 25 grams of water was added dropwise to the mixed solution while stirring, and after the dropwise addition was completed, the constant temperature stirring was continued for 10 minutes. Filtration and drying yielded 13.0 g of solid with a purity of 99.02% and a yield of 68%.

Embodiment 3

[0017] Add 25 grams of raw materials with a biphenyl content of 85.6% into 162.5 grams of isopropanol, mix thoroughly at 30°C, and then cool the mixture to 10°C. Then, 32.5 grams of water was added dropwise to the mixed solution while stirring, and after the dropwise addition was completed, the constant temperature stirring was continued for 10 minutes. Filtration and drying yielded 11.6 g of solid with a purity of 99.42% and a yield of 53.9%.

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Abstract

The invention relates to a biphenyl purification method for extracting high-purity biphenyl from coal tar recovered washing oil in the field of coal chemical industry, in particular to a method for dissolving, crystallizing and purifying biphenyl. The invention solves the technical problems that the existing biphenyl purification method is difficult to effectively solve the adhesion and coercion of impurities in the crystal, low yield and high cost. The present invention is achieved through the following technical scheme: a method for dissolving and crystallizing biphenyl, the purification steps are as follows: dissolving biphenyl with a purity of more than 70% in the main solvent to form a mixed solution, and then cooling the mixed solution to a certain temperature , add a solvent to the solution at a constant temperature to precipitate biphenyl crystals, separate the crystals from the mother liquor, and further dry the crystals to obtain high-purity biphenyl products. The invention is mainly used for extracting high-purity biphenyl from coal tar recovery washing oil.

Description

Technical field: [0001] The invention relates to a biphenyl purification method for extracting high-purity biphenyl from coal tar recovered washing oil in the field of coal chemical industry, in particular to a method for dissolving, crystallizing and purifying biphenyl. Background technique: [0002] Biphenyl is an important organic raw material with a wide range of uses. It can be mixed with biphenyl ether as a heat carrier, and can also be used to prepare many products such as emulsifiers, fluorescent whitening agents, fabric dyes, synthetic resins, liquid crystal materials, pesticides and medicines. An important derivative product. The mass fraction of biphenyl in coal tar is about 0.2-0.4%, most of which is concentrated in the wash oil fraction, and the fraction in the wash oil is about 8%. Currently adopted methods for extracting high-purity biphenyl from wash oil include high-efficiency rectification-crystallization and azeotropic distillation of light wash oil. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/14C07C15/14
Inventor 侯文杰郑胜华
Owner BAOWU CHARCOAL MATERIAL TECH CO LTD
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