Method of continuously producing epichlorohydrin by directly epoxidizing chloropropene

An epichlorohydrin and chloropropene technology, applied in chemical instruments and methods, chemical recovery, organic chemistry, etc., can solve the problems of unstable operation, difficult separation and recovery of catalysts, etc., and achieve the effects of stable reaction temperature and simple process flow

Active Publication Date: 2014-09-03
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to solve the problems of difficult separation and recovery of catalysts and unstable operation in the prior art for the production of epichlorohydrin by direct epoxidation of chloropropene under reaction control and phase transfer catalysis, and to provide a new direct epoxidation of chloropropene A continuous production method for preparing epichlorohydrin, which has the advantages of stable reaction temperature, simple process flow, no need for catalyst to react, and then separated and re-pulped to configure

Method used

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  • Method of continuously producing epichlorohydrin by directly epoxidizing chloropropene
  • Method of continuously producing epichlorohydrin by directly epoxidizing chloropropene
  • Method of continuously producing epichlorohydrin by directly epoxidizing chloropropene

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Embodiment 1

[0029] according to figure 2 Shown two reactor series epichlorohydrin production process;

[0030] The secondary reactor is composed of two reactors connected in series, and the structure is as follows: a reflux condenser is provided at the top of each reactor in the secondary reactor;

[0031] A feed inlet and a slurry return inlet are provided on the lower side wall of the first-stage reactor; an overflow port is provided on the upper side wall of the first-stage reactor; on the upper side wall of the last-stage reactor A clear liquid discharge port with a built-in filter is provided, and a slurry return outlet is provided below the clear liquid discharge port and on the upper side wall of the reactor. A slurry pump is installed on the pipeline;

[0032] An overflow port is provided on the upper side wall of the first-stage reactor, and an overflow material inlet is provided on the lower side wall of the last-stage reactor. The overflow port and the overflow material inle...

Embodiment 2

[0038] according to figure 1 The single reactor epichlorohydrin production process shown;

[0039] Single reactor structure: The upper side wall of the reactor is provided with a clear liquid outlet with a built-in filter, and a slurry return outlet is provided below the clear liquid outlet and on the middle and upper side wall of the reactor. The lower side of the reactor The wall is provided with a feed inlet and a slurry return inlet, and the slurry return outlet and the slurry return inlet are connected by pipes, and a slurry pump is arranged on their connecting pipes; a reflux condenser is provided at the top of the reactor;

[0040] The volume of the reactor is 45L, and the total volume is 45L. Add 2.5kg of phosphotungstic heteropoly salt catalyst and 35L of chloropropene into the reactor through a metering pump in advance. When the reaction temperature is 50°C and the reaction pressure is 0.1MPa, start For continuous production, allyl chloride and hydrogen peroxide are...

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Abstract

The invention discloses a method of continuously producing epichlorohydrin by directly epoxidizing chloropropene. The method of continuously producing epichlorohydrin by directly epoxidizing chloropropene includes: respectively transporting chloropropene, hydrogen peroxide, catalyst slurry or / and solvent to a reactor through a metering pump, the reactor is a single reactor or multistage reactors which are connected in series, reaction pressure is 0.1 to 1.0 MPa, and reaction liquid is in a homogeneous phrase state or a non-homogeneous phrase state. A filter is arranged at the upper end of a discharge port in the reactor to extract liquor with products, materials which are arranged at the lower end of the filter, are not filtered, contain catalyst and are not completely reacted is transported to the reactor through the metering pump which is arranged at the lower end of the reactor, the catalyst is free from recycling the catalyst in the continuous production process, and gaseous phrase portion conducts condensation reflux through a condenser which is arranged at the top of the reactor. The method of continuously producing epichlorohydrin by directly epoxidizing chloropropene has the advantages of being stable in reaction temperature and simple in process flow, the catalyst is free from being separated, beaten and configured again after reaction, the hydrogen peroxide is high in effective utilization and epichlorohydrin is high in yield, and method of continuously producing epichlorohydrin by directly epoxidizing chloropropene can be used in industry production.

Description

technical field [0001] The invention relates to production equipment and a production method of the chemical product epichlorohydrin. Specifically, the present invention uses hydrogen peroxide as an oxidant, and a heteropolyacid salt with reaction-controlled phase transfer characteristics as a catalyst to directly catalyze the epoxidation of chloropropene for continuous preparation of epichlorohydrin. technical background [0002] Epichlorohydrin (Epichlorohydrin, ECH) is an important basic chemical raw material, mainly used in the production of epoxy resin, epichlorohydrin rubber, glycerin, and surfactants, medicines, pesticides, coatings, ion exchange resins, plasticizers And other products. Industrial production methods mainly include the chlorohydrin method and the allyl alcohol method. The main raw materials of the chlorohydrin method are propylene, chlorine and lime. Chloropropanol is saponified to obtain epichlorohydrin in three steps. Chlorohydrin method process f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D303/08C07D301/12B01J8/10
CPCY02P20/584
Inventor 高爽张毅张恒耘赵公大李军陈曙光吕迎
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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