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Epichlorohydrin

TECHNOLOGY FOR THE PRODUCTION OF EPICHLOROHYDRIN


PROCESS FEATURES
Epichlorohydrin is a C3 organic epoxy compound, which combines the reactivity of an epoxy group (an oxygen bridge) with the additional reactivity of a chloro-group.
Epichlorohydrin undergoes a great variety of chemical reactions with many types of compounds. It is the major raw material for epoxy resins, which account for up to 75% of total output.
Thanks to its inherent versatility, it is used in a wide variety of other applications, including ion exchange resins, textiles, paper sizing, special inks and dyes, surface active agents, elastomers, plasticizers, agricultural products, liners, pharmaceuticals and many other applications.

With its improved epichlorohydrin process CONSER has secured a leading position in the epichlorohydrin market. CONSER has the widest experience of any licensor offering epichlorohydrin know how.
The epichlorohydrin plants designed and licensed by CONSER are producing the most exacting specifications and chemical purity (better than 99.9%) based on easy, safe and reliable operation. Know how is also available on the design of the auxiliary units, including the effluent disposal system.

CONSER has recently developed and patented a new technology route, called ECH-EF (epichlorohydrin eco-friendly), to produce epichlorohydrin using glycerine and hydrogen chloride as raw materials.

REFERENCES

Company Location Capacity T/y Technology
S.I.R. Italy  36000 Conventional
ALCLOR   Brazil   15000 Conventional
TECHCORP  Iraq 10000 Conventional
HYCC  S. Korea 20000 Conventional
TAMILNADU PETR. LTD India  10000 Conventional
SINOPEC-YUEYANG G.P.W. China 24000 Conventional
BLUESTAR NEW CHEMICAL MATERIALS China 30000 Conventional
TANGSHAN RISUN CHEMICAL Co. China 100000 Eco - Friendly

 

FLOWSHEET

EPICHLOROHYDRIN


PROCESS DESCRIPTION
CONSER epichlorohydrin process consists of the following main steps:
• Chlorination of propylene
• Chlorohydrination of allylchloride
• Dehydrochlorination of dichlorohydrins
• Epichlorohydrin purification

Chlorination of propylene
Allylchloride is obtained by direct chlorination of propylene with chlorine in gas phase at rather high temperatures. The stream leaving the reactor is fed to a depropanizer tower which separates overhead hydrogen chloride and propylene from raw allylchloride. This latter is rectified in a two column fractionating system.
The gas mixture from the depropanizer is washed with water for absorbing HCl to obtain commercial hydrochloric acid. After the washing the resulting wet propylene is compressed, condensed, dried and recycled to the reaction.

Chlorohydrination of allylchloride

Chlorohydrination of allylchloride is performed by reacting allylchloride with hypochlorous acid.
The rectified allylchloride, water and chlorine react at nearly ambient temperature to give dichlorohydrins with relatively high yields.

Dichlorohydrins hydrolysis

The hydrolysis of dichlorohydrins to epichlorohydrin, using milk of lime as saponifying agent, is accomplished in a distillation tower where epichlorohydrin is stripped by live steam injected to the bottom of the tower.
Waste water is taken off from the bottom of stripper, while an organic phase, consisting of raw epichlorohydrin, is separated overhead.

Epichlorohydrin purification

The raw epichlorohydrin is rectified in a fractionation column system.
In the purification system high purity epichlorohydrin is separated from water and low and high boiling impurities.

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