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

Continuous synthesizing process of epichlorohydrin

A technology for the synthesis of epichlorohydrin, which is applied in chemical recovery, organic chemistry, etc., can solve the problems of catalyst separation loss engineering, the impact of catalyst stability and recycling, and the catalyst contains too much water, so as to reduce the loss probability and recovery rate High, the effect of improving the recovery rate

Active Publication Date: 2019-08-02
JIANGSU YANGNONG CHEM GROUP +2
View PDF4 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, how to reduce the separation loss of the catalyst and how to realize the continuous separation operation are also the difficulties that plague the engineering
CN206232636, adopts the combined mode of screw pump+liquid-solid separator to realize the separation of catalyst, but the catalyst separated by screw pump contains much water (about 20% of water), and the catalyst with small particle size will be lost with the water phase, and the water content High and mechanical loss will affect the stable cycle use of the catalyst
CN205199522 adopts a special catalyst recovery device, realizes gravity sedimentation and separation of the catalyst through the baffles in the device, but also fails to solve the problem of high water content of the catalyst

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
  • Continuous synthesizing process of epichlorohydrin
  • Continuous synthesizing process of epichlorohydrin
  • Continuous synthesizing process of epichlorohydrin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A stainless steel reactor and a two-stage stainless steel loop reactor are used in series, the volume of the reactor is 100L, the volume of each loop reactor is 100L, the total volume of the reactor is 300L, and the residence time is 3h. A centrifugal pump is used to pump the slurry formed by 75L / h 3-chloropropene and the catalyst into the reactor respectively (according to the catalyst accounts for 5% of the chloropropene weight to configure the slurry) and 17.5L / h of 50% hydrogen peroxide, and the reaction temperature is 47°C. Pressure 0.2MPa, pump 50% hydrogen peroxide 7.5L / h into the primary loop reactor, reaction temperature 53°C, pressure 0.3MPa, secondary loop reactor temperature 52°C, pressure 0.3MPa, and add 0.5kg / h 10% Aqueous ammonium sulfate solution, a sufficient amount of nitrogen is fed into the inlet of the condenser to ensure that the oxygen content in the tail gas is lower than 5%.

[0020] Continuously extract the reaction materials from the secondary...

Embodiment 2

[0022] A stainless steel reactor and a two-stage stainless steel loop reactor are used in series, the volume of the reactor is 100L, the volume of each loop reactor is 100L, the total volume of the reactor is 300L, and the residence time is 2.5h. A centrifugal pump is used to pump the slurry formed by 96L / h 3-chloropropene and the catalyst into the reactor respectively (according to the catalyst accounts for 4% of the chloropropene weight to configure the slurry) and 48% hydrogen peroxide 16L / h, the reaction temperature is 49 ℃, the pressure 0.3MPa, 48% hydrogen peroxide 8L / h is pumped into the primary loop reactor, the reaction temperature is 51°C, the pressure is 0.25MPa, the temperature of the secondary loop flow reactor is 52°C, the pressure is 0.3MPa, and 0.8kg / h 10% diphosphoric acid is added Aqueous ammonium hydrogen solution, a sufficient amount of nitrogen is fed into the inlet of the condenser to ensure that the oxygen content in the tail gas is lower than 5%.

[002...

Embodiment 3

[0025] A stainless steel reactor and a two-stage stainless steel loop reactor are used in series, the volume of the reactor is 100L, the volume of each loop reactor is 100L, the total volume of the reactor is 300L, and the residence time is 4h. Use a centrifugal pump to pump the slurry formed by 42.5L / h 3-chloropropene and the catalyst into the reactor respectively (according to the catalyst accounts for 4% of the chloropropene weight to configure the slurry) and 60% hydrogen peroxide 18L / h, and the reactor temperature is 45°C , pressure 0.15MPa, pump 60% hydrogen peroxide 14.5L / h in the primary loop reactor, reaction temperature 52°C, pressure 0.3MPa, secondary loop reactor temperature 50°C, pressure 0.2MPa, and add 0.8kg / h 10 % Potassium dihydrogen phosphate aqueous solution, a sufficient amount of nitrogen is fed into the inlet of the condenser to ensure that the oxygen content in the tail gas is lower than 5%.

[0026] Continuously extract the reaction materials from the s...

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 continuous synthesizing process of epichlorohydrin. Specifically, a kettle type reactor and a circulation flow reactor are connected in series; different ratios of hydrogenperoxide are added in stages for reaction; different temperatures and times are controlled; a product directly enters a closed type scraper centrifugal machine to separate out a catalyst and a reaction liquid after the reaction is ended; the reaction liquid is layered to obtain an oil layer and a water layer; chloropropene and the separated catalyst are recycled and pulped to return to a reactionsystem; continuous catalytic operation of the catalyst is realized.

Description

technical field [0001] The invention relates to a continuous synthesis process of epichlorohydrin. Specifically, a tank reactor and a loop reactor are connected in series, and different proportions of hydrogen peroxide are added to react in stages to improve the utilization rate of hydrogen peroxide. After the reaction, the materials are directly Enter the closed scraper centrifuge to separate the solid catalyst and the reaction liquid, and the separated catalyst and allyl chloride are beaten into a slurry and returned to the reaction system to realize the continuous circulation of the catalyst. Background technique [0002] Epichlorohydrin is an important petrochemical product, mainly used in the production of epoxy resins. At present, there are two main production processes of epichlorohydrin: chlorohydrin method and glycerin method. 70% of domestic epichlorohydrin comes from the chlorohydrin method, and its biggest disadvantage is that it produces 50 tons / ton of epichlor...

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): C07D301/12C07D301/32C07D303/08
CPCC07D301/12C07D301/32C07D303/08Y02P20/584
Inventor 徐林孙诚丁克鸿王怡明曹亚丽李明吕丽
Owner JIANGSU YANGNONG CHEM 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