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Industrial method for realizing direct ECH (epichlorohydrin) continuous production by phase transfer catalyst

The technology of a phase transfer catalyst and an industrial method, which is applied in the industrial field of direct production of ECH and continuous production, can solve the problems of difficulty in large-scale industrial production, increase excess power consumption, difficult reaction process, etc., so as to increase reaction safety and save energy. Consume and react thoroughly

Active Publication Date: 2019-06-21
山东凯泰科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the DECH method is relatively mature in the batch production in the laboratory stage, but in the actual continuous production operation process, the continuous production method and equipment preparation are in its infancy
[0003] Patent CN103159703A discloses a method for the continuous production of propylene oxide by the direct oxidation of propylene chloride, but this method is relatively simple, and a multi-stage stirred tank reactor is used for production. Not high, additional stirring is required, additional power consumption is increased, and it is difficult to expand chemical industrial production on a large scale, etc.

Method used

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  • Industrial method for realizing direct ECH (epichlorohydrin) continuous production by phase transfer catalyst
  • Industrial method for realizing direct ECH (epichlorohydrin) continuous production by phase transfer catalyst
  • Industrial method for realizing direct ECH (epichlorohydrin) continuous production by phase transfer catalyst

Examples

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Embodiment 1

[0020] Such as figure 1 As shown, an industrial method for direct production of ECH using a phase transfer catalyst includes the following steps: (1) Propylene chloride is mixed with the catalyst in the batching tank VE-1 and then enters the first-stage reaction system through the pipeline, and passes through the first-stage reaction system. The reflux pump PU-2 and the hydrogen peroxide added at the inlet of the first-stage tubular reactor RE-1 are mixed in the first-stage mixer MX-1 at the front of the first-stage tubular reactor RE-1 and then reacted in the first-stage tubular reactor. (2) The reacted materials in the first-stage tubular reactor RE-1 enter the first-stage buffer tank VE-2, and the gaseous phase enters the first-stage buffer tank VE-2 together with the nitrogen introduced in the first-stage buffer tank VE-2. VE-2 tank top condenser HE-2 condenses in the first-level buffer tank, the condensed liquid phase is returned to the first-level buffer tank VE-2, and the...

Embodiment 2

[0023] Such as figure 2 As shown, on the basis of Example 1, an industrial method for direct production of ECH continuous production using a phase transfer catalyst is added in step (1): After the chloropropylene and the catalyst are mixed in the batching tank VE-1, the pump PU-1 enters the preheater HE-1 under pressure for preheating, and then enters the first-stage reaction system after preheating. The preheating temperature is 35-55°C. Steps (3) and (4) correspond to: Step (3) Blow nitrogen into the secondary buffer tank VE-3, and the gas phase in the secondary buffer tank VE-3 enters the top of the secondary buffer tank VE-3 for condensation HE-3 is condensed, and the condensed liquid phase is refluxed to the secondary buffer tank VE-3, and the gas phase enters the scrubber; part of the liquid phase in the secondary buffer tank VE-3 is refluxed to the second stage by the secondary reflux pump PU-3 In the tubular reactor RE-2, the reacted materials re-enter the secondary bu...

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Abstract

The invention relates to the field of ECH (epichlorohydrin) production, in particular to an industrial method for realizing direct ECH continuous production by a phase transfer catalyst. The industrial method comprises the following steps: chloropropene and the catalyst are mixed in a mixing tank, and the mixture is mixed with another strand of raw material hydrogen peroxide for reaction in multistage tubular reactors. A mixer is arranged in the front of each tubular reactor, a buffer tank is arranged at the back of each tubular reactor, nitrogen is introduced in the buffer tanks, a gas phaseof the buffer tanks is condensed by a condenser, a liquid phase flows back, the gas phase enters a washing tower, one liquid phase of the buffer tank flows back and the other enters the next buffer tank to repeat the reaction process; part of the liquid phase flowing out of the last buffer tank flows back and the other part enters a separation system for separation. The design is ingenious, the multistage tubular reactors substitute for an agitator type reactor, reaction materials form turbulent flow and are mixed uniformly by a reflux pump instead of stirring by the agitator type reactor, sothat the reaction is safe and stable, and the operation cost is saved. The method has potential market value.

Description

Technical field [0001] The invention relates to the field of epichlorohydrin production, in particular to an industrial method for direct production of ECH using a phase transfer catalyst. Background technique [0002] Epichlorohydrin is an organic compound whose main purpose is to make epoxy resin. It is also a stabilizer and chemical intermediate for oxygen-containing substances, and the main raw material for epoxy and phenoxy resins; Solvents for the manufacture of glycerin, cured propylene rubber, cellulose esters and ethers, and high wet strength resins for the paper industry. At present, the production methods of epichlorohydrin include the DECH (direct oxidation) method, the chlorohydrin method, the glycerin method and the allyl alcohol method. The DECH method has great environmental advantages, no waste, very little waste water, and has a short process. , Low energy consumption, easy to put into production and construction of enterprises, etc., gradually developed into t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D301/12C07D303/08
CPCY02P20/584
Inventor 徐艳霞王振民
Owner 山东凯泰科技股份有限公司
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