Equipment and method for washing prodn. of nitrobenzene

A production device and technology of nitrobenzene, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of increasing equipment investment and operating costs, small operating flexibility, and large water consumption, etc., to achieve Increase effective production time, stable operation, and large operating flexibility

Inactive Publication Date: 2006-04-12
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
View PDF0 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The other is multi-injector series jet washing. Jet washing has good deacidification and phenol removal effects, but the operation flexibility is small, and it cannot be operated within a wide output range. In addition, jet washing relies on high-speed flowing water and alkaline water To pump crude nitrobenzene, so the water

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
  • Equipment and method for washing prodn. of nitrobenzene
  • Equipment and method for washing prodn. of nitrobenzene
  • Equipment and method for washing prodn. of nitrobenzene

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0025] Example one

[0026] Nitrobenzene washing production equipment, including nitrification mixed liquid separator 3, lye tank 4, lye transfer pump 2, crude nitrobenzene transfer pump 1, crude nitrobenzene flow meter 5, lye flow meter 6, tee 7. Crude nitrobenzene scrubber 8. Washing wastewater separator 9. The crude nitrobenzene scrubber 8 is composed of four short pipes 10 connected by connecting pipes 11. Each short tube 10 is 4m long and 120mm in diameter.

[0027] Specific installation method: the crude nitrobenzene outlet of the nitrification mixed liquid separator 3 is connected with the inlet of the crude nitrobenzene transfer pump 1 through a pipeline, and the lye outlet of the lye tank 4 is connected with the inlet of the lye transfer pump 2 through a pipeline. The outlet pipelines of the base benzene delivery pump 1 and the lye delivery pump 2 are respectively equipped with a crude nitrobenzene flow meter 5 and an lye flow meter 6 with a display, and are connected wit...

Example Embodiment

[0028] Example two

[0029] The second embodiment is basically the same in structure as the first embodiment, and the difference is that: the short tube 10 of the crude nitrobenzene scrubber 8 is provided with a built-in member 12.

Example Embodiment

[0030] Example three

[0031] The nitrobenzene washing production method includes storing the equivalent amount of lye used in the neutralization reaction and the dephenolization reaction in the lye tank 4, and the nitration mixture obtained from the nitration reaction enters the nitration mixture separator 3, and after this separation operation, The waste acid contained in the nitration mixture is as little as possible to reduce the consumption of washing alkali. Pre-separation of waste acid adopts sedimentation separation or hydrocyclone separation, after separating the nitrated waste acid, the crude nitrobenzene to be washed is obtained. The lye is pumped out through the lye transfer pump 2, enters the pipeline, and enters the tee 7 through the lye flow meter 6 with a display, and the crude nitrobenzene after separating the nitrated waste acid is sent from the crude nitrobenzene transfer pump 1 The nitrification mixed liquid separator 3 is pumped into the pipeline, and after th...

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

This invention relates to a production unit for washing nitrobenzene, including a separator for nitration mix liquid, a separator for washing waste water, it is characterized by setting a washer between the separator for nitration mix liquid and the separator for washing waste water for washing crude nitrobenzene, the washer for washing crude nitrobenzene is pipe washer. The main operation parameters for the production process are: flow rate is less than or equal to 1.5m/s, the reaction temperature controlled 20-100 DEG C, the operation pressure is less than or equal to system resistance formed from material flow +0.1Mpa, the retention time in the pipe washer for nitrobenzene is less than or equal to 60min. the main advantages of the invention are: less investment for equipment, good washing effect and saving base, water and electric.

Description

(1) Technical field [0001] The invention relates to a chemical product production device and production method, in particular to a production device and production method for refined deacidification and dephenolization of crude nitrobenzene in the production process of nitration of benzene to produce nitrobenzene. (2) Background technology [0002] The crude nitrobenzene produced by benzene under the action of mixed acid contains residual acid and nitrophenol by-products that will bring danger to subsequent production. The process of refining nitrobenzene is to use a certain concentration of lye to neutralize the residual acid in crude nitrobenzene and react nitrophenols with alkali to form phenoxide. The phenoxide is dissolved in water to realize the production process of deacidification and dephenolization to obtain refined nitrobenzene. The above production process is customarily called nitrobenzene washing. [0003] There are two methods of washing nitrobenzene at home...

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
IPC IPC(8): C07C205/06C07C201/16
Inventor 吴剑华王文江郭瓦力
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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