A kind of technological process of producing epichlorohydrin by epoxidation of propylene chloride

The technology of epichlorohydrin and epichlorohydrin tower is applied in the field of production technology of chemical products, and can solve the problems of producing 11 tons of waste water, high equipment investment, lengthy process, etc., and achieve the effect of small loss.

Active Publication Date: 2018-10-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the allyl alcohol process has mild reaction conditions, fewer by-products, and halved the consumption of chlorine and lime raw materials, it has disadvantages such as lengthy process, high equipment investment, and 11 tons of waste water per ton of product produced.

Method used

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  • A kind of technological process of producing epichlorohydrin by epoxidation of propylene chloride
  • A kind of technological process of producing epichlorohydrin by epoxidation of propylene chloride
  • A kind of technological process of producing epichlorohydrin by epoxidation of propylene chloride

Examples

Experimental program
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Effect test

Embodiment 1

[0057] 1) Through the nitrogen inlets provided on the top of the primary reactor (R1), secondary reactor (R2), and tertiary reactor (R3) to the primary reactor (R1), secondary reactor (R2), Pass into the three-stage reactor (R3) to replace the air in the reactor cavity with nitrogen and keep the continuous feeding of nitrogen and the discharge of tail gas, and set the reaction pressure to 0.75MPa;

[0058] 2) Set the heaters of the primary reactor (R1), secondary reactor (R2), and tertiary reactor (R3) to 65°C, and set the condensation temperature of the top reflux condensation device of the three reactors to 0 ℃; the condensation temperature of the condenser (E2) is set to -5 ℃, and the pressure of the secondary pressurized condensation storage tank (V4) is set to 1.0MPa; the temperature of the reboiler at the bottom of the chloropropene tower (T1) is set to 90 ℃, The temperature of the top reflux condenser is -5°C, and the operating pressure is 0.040MPa; the temperature of t...

Embodiment 2

[0067] figure 2 It is a working line obtained by carrying out continuous production for 100 hours according to the process conditions of Example 1, and analyzing the mass concentration of epichlorohydrin in the oil phase of Y1001 and the selectivity of allyl chloride by taking a sample every hour for analysis. It can be seen from the figure that the oil phase of Y1001 The mass concentration of epichlorohydrin in the medium is maintained between 21% and 24%, and the selectivity of chloropropene in the oil phase of Y1001 is greater than 94%, and is maintained at about 95%.

Embodiment 3

[0069] image 3 It is to carry out 100 hours of continuous production according to the process conditions of embodiment 1, and the epichlorohydrin tower output E1001 product epichlorohydrin mass concentration is carried out to take a sample every hour and analyze the working line that obtains, as seen from the figure, the product epoxy chlorohydrin The mass concentration of chloropropane reaches above 99.8.

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Abstract

A process flow for producing epichlorohydrin by epoxidation of propylene chloride provided by the present invention, including a reaction part, a separation part and a tail gas treatment part, is characterized in that phosphotungstic heteropolyacid quaternary ammonium salt is used as a catalyst and hydrogen peroxide is used as an oxidant , to prepare epichlorohydrin by epoxidation of propylene chloride under the condition of inert gas pressure. The materials produced by the reaction are separated by a three-phase separator to separate the oil phase, water phase and solid phase catalyst; the oil phase passes through the chloropropene tower to recover the chloropropene, and then passes through the epichlorohydrin tower to separate the product epichlorohydrin and by-product di Chloropropanol; the water phase is passed through the water refining tower to separate the by-product monochloropropanediol, and then discharged after membrane filtration; the solid-phase catalyst is recycled to the catalyst slurry tank after re-dosing. The technological process provided by the present invention is simple, less three wastes, high energy and low, and mild reaction conditions, and is suitable for the industrial production of epichlorohydrin.

Description

technical field [0001] The invention belongs to the field of production technology of chemical products, and specifically relates to a technology for producing epichlorohydrin by epoxidation of propylene chloride. Background technique [0002] Epichlorohydrin is an important basic chemical raw material, mainly used in the production of various products such as epoxy resin, epichlorohydrin rubber, glycerin, and surfactant. The current industrial production methods mainly include the chlorohydrin method and the allyl alcohol method. [0003] The main raw materials of the chlorohydrin method are propylene, chlorine and lime. The main reaction process consists of three steps: high-temperature chlorination of propylene to obtain chloropropene, hypochlorination of chloropropene to obtain dichloropropanol, and saponification of dichloropropanol to obtain epichlorohydrin. Chlorohydrin method process characteristics: it has the characteristics of large-scale production, continuous o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D303/08C07D301/12
CPCY02P20/584
Inventor 高爽张毅吕迎张恒耘赵公大
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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