Washing production method for crude nitrochlorobenzene

A technology for nitrochlorobenzene and a production method, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of large floor space, large amount of phenol-containing wastewater, and large number of equipments, and saves equipment. Investment, reducing water consumption, good washing effect

Active Publication Date: 2017-01-04
CHINA PETROLEUM & CHEM CORP +1
View PDF3 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Washing production method for crude nitrochlorobenzene

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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C07C205/12C07C201/16
Inventor 金汉强陈琛赵思远
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap