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Kettle type crystallization process of paradichlorobenzene in solid waste benzene chloride tar

A dichlorobenzene kettle type, chlorinated benzene tar technology, applied in the direction of solution crystallization, organic chemistry, chemical instruments and methods, etc., can solve the problems of low yield, difficult operation, high energy consumption, etc., and achieve high yield and easy operation Simple, low energy consumption effect

Active Publication Date: 2009-11-18
JIANGSU LONGCHANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The isomers of dichlorobenzene as the main component have a small difference in boiling point, so it is difficult to purify p-dichlorobenzene by rectification according to the practical experience of rectification for many years
Therefore, industrialized production generally utilizes the large difference in freezing points between them to purify p-dichlorobenzene by means of crystallization. The traditional crystallization-sweating method for purifying p-dichlorobenzene has high energy consumption and low yield, which is difficult to operate. difficulty

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Get 3 tons of mixed dichlorobenzene raw material, concrete composition is as follows:

[0011] Raw material status

[0012] product name

[0013] The above-mentioned raw materials are transported to the crystallization tank through vacuum or pumps, and at the same time, the cooling system is turned on to cool the raw materials with cooling brine at a temperature of -12°C, and the temperature is lowered to -4°C, and at the same time, the raw materials are heated at 10 rpm. Stir at a speed of 1 minute to form qualified crystal nuclei and grow. The crystallization grows up to obtain qualified crystal slurry. After being released from the bottom of the crystallization kettle, it enters the centrifuge and is separated by the centrifuge to obtain 1.5 tons of finished products, with a yield of 50%.

Embodiment 2

[0015] Transfer 3 tons of mixed dichlorobenzene raw materials to the crystallization tank through vacuum or pump, and at the same time turn on the cooling system to cool the raw materials with cooling brine at a temperature of -10°C, lower their temperature to -4°C, and at the same time The raw materials are stirred at a speed of 20 rpm to form qualified crystal nuclei and grow, and the crystallization grows to obtain qualified crystal slurry, which is released from the bottom of the crystallization kettle and then enters a centrifuge, and 1.45 tons of finished products are obtained by centrifuge separation. The rate is 48%.

Embodiment 3

[0017] Transfer 3 tons of mixed dichlorobenzene raw materials to the crystallization tank through vacuum or pump, and at the same time turn on the cooling system to cool the raw materials with cooling brine at a temperature of -10°C, lower their temperature to -4°C, and at the same time The raw materials are stirred at a speed of 30 rpm to form qualified crystal nuclei and grow, and the crystallization grows to obtain qualified crystal slurry, which is released from the bottom of the crystallization kettle and enters the centrifuge, and the finished product is separated by the centrifuge. The yield is 1.4. was 47%.

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PUM

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Abstract

The invention discloses a kettle type crystallization process of paradichlorobenzene in solid waste benzene chloride tar, which comprises the following steps of: conveying mixed dichlorobenzene raw materials to a crystallization kettle through vacuum or a pump; simultaneously starting a cooling system, and using cooling brine to reduce the temperature of the raw materials; stirring the raw materials, thus leading the raw materials to form qualified crystal nucleuses which grow; obtaining qualified magma after the crystal nucleuses grow up; discharging the qualified magma from the bottom of the crystallization kettle; and obtaining finished product through separation by a centrifuger. The process has the advantages that the raw material is crystallized by regulating circulating refrigerant and controlling temperature change, temperature of solution and stirring rate in the kettle type crystallization process; the energy consumption is low; the yield is high; and the operation is simple.

Description

technical field [0001] The invention relates to a crystallization process, in particular to a still-type crystallization process of solid waste chlorinated benzene tar p-dichlorobenzene. Background technique [0002] P-dichlorobenzene (P-DCB) is an important organic chemical raw material and intermediate. It is widely used in the production of medicine, pesticide, dyestuff and chemical products. It is a promising fine chemical raw material. In industry, benzene is mainly used for directional catalysis and chlorination to produce chlorobenzene. A certain amount of chlorinated benzene tar will be produced during the production process. In addition to p-dichlorobenzene, chlorobenzene tar also has some o-dichlorobenzene Benzene and a small amount of chlorobenzene, trichlorobenzene, m-dichlorobenzene and unreacted benzene impurities. The isomers of dichlorobenzene as the main component have very little difference in boiling points, so it is difficult to purify p-dichlorobenzene ...

Claims

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Application Information

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IPC IPC(8): C07C25/08C07C17/392B01D9/04
Inventor 佘道才王兆昌吴春江杨海荣
Owner JIANGSU LONGCHANG CHEM
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