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Crude nitrochlorobenzene washing production method

A technology of nitrochlorobenzene and separator, which is applied in the fields of chemical instruments and methods, organic chemistry, and the preparation of organic compounds, etc. It can solve the problems of a large number of equipment, a large amount of phenol-containing wastewater, and a large floor area, and achieve the washing effect Good, reduce water consumption and save equipment investment

Active Publication Date: 2018-09-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This production method uses primary water for mixed washing, which not only consumes a lot of primary water, but also produces a lot of phenol-containing wastewater, but also has a large number of equipment, high investment, large floor area, complicated operation and control, and difficult to guarantee the washing effect.

Method used

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  • Crude nitrochlorobenzene washing production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Crude nitrochlorobenzene at a temperature of 75°C 9.3m 3 / h, 20% concentration of sodium hydroxide 0.3 m 3 / h and secondary water enter the 1# static mixer with a diameter of 150mm and a length of 2m, and control the pressure at 0.2MPa. After being fully mixed and neutralized in the 1# static mixer, it enters the 1# separator, and the material in the 1# separator stays The time is 10 minutes, the upper inorganic phase is treated with waste alkali, the lower organic phase and the primary water from the outlet of the 3# separator enter the 2# static mixer and are mixed and washed, and the pressure is controlled at 0.2MPa. The washed material enters the 2# separator. The material residence time in the 2# separator is 10min, the upper aqueous phase enters the 1# static mixer, and the lower organic phase and fresh process water are 5.4 m 3 / h enters the 3# static mixer for mixing and washing, the washed material enters the 3# separator, the upper layer water of the 3# separ...

Embodiment 2

[0019] Crude nitrochlorobenzene at a temperature of 75°C 9.3m 3 / h, 30% concentration of sodium hydroxide 0.2 m 3 / h and secondary water enter the 1# static mixer with a diameter of 150mm and a length of 2m, and control the pressure at 0.2MPa. After being fully mixed and neutralized in the 1# static mixer, it enters the 1# separator, and the material in the 1# separator stays The time is 20 minutes, the upper inorganic phase is treated with waste alkali, the lower organic phase and the primary water from the outlet of the 3# separator enter the 2# static mixer and are mixed and washed, and the pressure is controlled at 0.2MPa. The washed material enters the 2# separator. The material residence time in the 2# separator is 20min, the upper aqueous phase enters the 1# static mixer, and the lower organic phase and fresh process water are 6.4 m 3 / h enters the 3# static mixer for mixing and washing, the washed material enters the 3# separator, the upper layer water of the 3# separ...

Embodiment 3

[0021] Crude nitrochlorobenzene at a temperature of 70°C 10.8m 3 / h, 30% concentration of sodium hydroxide 0.3 m 3 / h and secondary water enter the 1# static mixer with a diameter of 150mm and a length of 2m, and control the pressure at 0.2MPa. After being fully mixed and neutralized in the 1# static mixer, it enters the 1# separator, and the material in the 1# separator stays The time is 20 minutes, the upper inorganic phase is treated with waste alkali, the lower organic phase and the primary water from the outlet of the 3# separator enter the 2# static mixer and are mixed and washed, and the pressure is controlled at 0.2MPa. The washed material enters the 2# separator. The residence time of the material in the 2# separator is 20min, the upper aqueous phase enters the 1# static mixer, and the lower organic phase and fresh process water are 6.5 m 3 / h enters the 3# static mixer for mixing and washing, the washed material enters the 3# separator, the upper layer water of the ...

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Abstract

The invention relates to a washing production method for crude nitrochlorobenzene. After completion of a nitration reaction, nitration products and waste acid enter a nitration separator for separation; a separated organic phase successively undergoes alkali washing and water washing in a static mixer; and the obtained organic phase is subjected to subsequent treatment. Since the static mixer is used for alkali washing and water washing and pipelization is realized in the process of washing, so equipment investment can be reduced; washing water is connected in series for washing of crude nitrochlorobenzene, so the usage amount of water can be reduced, and washing effect is improved; and except a delivery pump, the whole set of apparatuses used in the method is free of movable articles, so a fault rate is low and effective production time can be increased.

Description

technical field [0001] The invention relates to a production method of chemical products, in particular to a production method for refining and deacidifying and dephenolizing crude nitrochlorobenzene in the production process of producing nitrochlorobenzene by nitration of chlorobenzene. Background technique [0002] Nitrochlorobenzene is an important chemical raw material, which is composed of three isomers: p-nitrochlorobenzene, o-nitrochlorobenzene and m-nitrochlorobenzene. Nitrochlorobenzene can be produced by liquid-phase nitration reaction of chlorobenzene with a mixed acid composed of sulfuric acid and nitric acid. The crude product obtained by nitration contains residual acid and phenolic by-products that will bring danger to subsequent production. The nitrochlorobenzene washing process is to use a certain concentration of lye to neutralize the residual acid in the crude nitrochlorobenzene, and make the phenols react with the alkali to form phenoxide. The phenate is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C205/12C07C201/16
Inventor 金汉强陈琛赵思远
Owner CHINA PETROLEUM & CHEM CORP