Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Clean technology for continuously synthesizing 2,4-dinitro-6-chloroaniline

A technology of dinitroaniline and dinitro, which is applied in the field of cleaning technology for synthesizing 2,4-dinitro-6-chloroaniline, can solve problems such as unclean production and difficult treatment, achieves reduction of the amount of hydrochloric acid, avoidance of Effects of exhaust emissions, significant economic and social benefits

Active Publication Date: 2016-04-06
ZHEJIANG LONGSHENG GROUP +1
View PDF6 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the chlorination reaction with sodium chlorate will produce a mother liquor containing sodium chloride, after the mother liquor is applied mechanically for a certain number of times, the sodium chloride content in the mother liquor is too high to be applied mechanically again, and the mother liquor containing high concentration of sodium chloride is difficult to handle. Can not really achieve clean production

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
  • Clean technology for continuously synthesizing 2,4-dinitro-6-chloroaniline
  • Clean technology for continuously synthesizing 2,4-dinitro-6-chloroaniline
  • Clean technology for continuously synthesizing 2,4-dinitro-6-chloroaniline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Continuous synthesis:

[0033] Such as figure 1 , using three-stage series reactors (2, 3, 4), three parallel filter presses (8, 9, 10) and two parallel mother liquor recovery tanks (11, 12), the first, second, and third stages The volume of the reactor is 50m 3 , control the chlorination temperature at 35-40°C, and the volume of the mother liquor recovery tank is 50m 3 , the volume of the filter press is 500m 3 , the volume of the mother liquor storage tank is 100m 3 , The liquid level of the mother liquid recovery tank is set to 90% of the volume.

[0034]Into the beating kettle (1), feed raw materials simultaneously and continuously for beating, control the feed rate of 2,4-dinitroaniline to be 915kg / h, the feed rate of 31% hydrochloric acid to be 4502kg / h, and 38% dispersant The feed rate of MF is 24kg / h, and the material in the beating tank enters the first-stage reactor (1) at a speed of 5441kg / h; the chlorine gas is passed into the first-stage reactor throug...

Embodiment 2

[0039] According to the operation method described in Example 1, only the hydrochloric acid is replaced with the mother liquor in the mother liquor storage tank, and the filter cake from the filter press is washed and dried to obtain the 2,4-dinitro-6 -Chloroaniline, measured purity (HPLC) 98.2%, yield 96.8%. The collected HCl gas is used for the synthesis of m-acetaniline, and the purity (HPLC) of 99% m-acetaniline can be obtained.

Embodiment 3

[0041] Continuous synthesis:

[0042] According to the operating method described in Example 1, the difference is the flow rate of raw materials: the feed rate of 2,4-dinitroaniline is 732kg / h, the feed rate of 30% hydrochloric acid is 3893kg / h, and 38% dispersion The feed rate of agent MF is 20kg / h, and the material in the beating kettle enters the first-stage reaction kettle at a speed of 4918kg / h; The material in the reaction kettle is passed into the next-stage reaction kettle at a flow rate of 5191kg / h; then injected into the filter press for filtration at a flow rate of 5191kg / h, and the filter press also enters the mother liquor recovery tank at a flow rate of 5191kg / h; the mother liquor recovery tank The air is blown in the middle, and when the concentration of hydrochloric acid is 30%, the air blowing is stopped, and the mother liquor enters the mother liquor storage tank, and the hydrogen chloride tail gas is collected at the same time; the mother liquor in the mothe...

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

PropertyMeasurementUnit
quality scoreaaaaaaaaaa
Login to View More

Abstract

A clean technology for continuously synthesizing 2,4-dinitro-6-chloroaniline adopts multistage serially connected reaction kettles and comprises the following steps: continuously adding 2,4-dinitroaniline, hydrochloric acid and chlorine to a first stage reaction kettle, carrying out a chlorination reaction under stirring, allowing parts of a material in a previous reaction kettle to enter a self reaction kettle through a pump and to circulate, allowing parts of the material in the previous reaction kettle to enter a next reaction kettle, continuously carrying out the chlorination reaction, allowing tail gas generated in the previous reaction kettle to enter the next reaction kettle, continuously carrying out the chlorination reaction, allowing parts of a material in a final stage reaction kettle to enter the self reaction kettle through a pump and to circulate, continuously discharging and filtering parts of the final obtained material after a detection result shows the reaction is completed to obtain a filter cake which is a 2,4-dinitro-6-chloroaniline product, allowing a mother liquor obtained after filtration to enter a mother liquor recovery tank, blowing air to the mother liquor in the mother liquor recovery tank, reusing hydrogen chloride tail gas obtained after blowing, pumping the blown mother liquor with certain acidity into a mother liquor storage tank, and recycling the mother liquor in the mother liquor storage tank to substitute hydrochloric acid.

Description

(1) Technical field [0001] The invention relates to a cleaning process for synthesizing 2,4-dinitro-6-chloroaniline, in particular to a cleaning process for continuously synthesizing 2,4-dinitro-6-chloroaniline. (2) Background technology [0002] 2,4-Dinitro-6-chloroaniline is an important intermediate of disperse dyes, and it is widely used both at home and abroad. Its production method is generally obtained by chlorination of 2,4-dinitroaniline as raw material. Chlorinating agents mainly include: (1) sodium hypochlorite; (2) sodium chlorate; (3) chlorine gas. [0003] (1) Use sodium hypochlorite as the chlorination agent to carry out chlorination reaction in hydrochloric acid medium. The production process of this method is more complicated, and by-products are produced in the reaction process, the product quality is poor, the color is deep, the chlorination time is long, and the equipment productivity is low , and the post-processing is more troublesome. [0004] (2) u...

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): C07C211/52C07C209/74
Inventor 余青结曾银城祝培明陆军李世华张桂香周俊锋倪松涛
Owner ZHEJIANG LONGSHENG GROUP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com