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Chlorination and dehydrochlorination reactions relevant to the manufacture of trichloroethene and tetrachloroethene: Part 1. Reaction pathways

Paper ID Volume ID Publish Year Pages File Format Full-Text
41422 45889 2011 11 PDF Available
Title
Chlorination and dehydrochlorination reactions relevant to the manufacture of trichloroethene and tetrachloroethene: Part 1. Reaction pathways
Abstract

Factors which affect the selectivity of the chlorination of 1,2-dichloroethane and the associated dehydrochlorination reactions have been examined using approximate thermodynamic calculations, equilibrium measurements, and a continuous flow micro-reactor. There is a balance between surface and gas-phase chemistry within the system. Heterogeneous catalysis is not necessary to effect dehydrochlorination of 1,1,2,2-tetrachloroethane to trichloroethene but an attapulgite-supported copper(II) chloride catalyst favours formation of pentachloroethane and its dehydrochlorination product, tetrachloroethene. The latter is the thermodynamic minimum of the system. Below 473 K and with long reaction times (2 h, batch reactor), radical chlorination to form pentachloroethane is dominant. Above 573 K and under flow conditions, free radical dehydrochlorination to form trichloroethene becomes dominant. Heterogeneous chlorination under flow conditions provides a route to pentachloroethane and thence tetrachloroethene. High conversions favour the formation of oligomeric products.

Graphical abstract.Figure optionsDownload full-size imageDownload high-quality image (72 K)Download as PowerPoint slideHighlights► The formation of trichloroethene and tetrachloroethene is investigated. ► A role for homogeneous and heterogeneous processes is established. ► Trichloroethene is identified as a kinetic product. ► The chemical foundations for the industrial process are established.

Keywords
Chlorination; Dehydrochlorination; Attapulgite; Copper(II) chloride; Homogeneous catalysis; Heterogeneous catalysis
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Chlorination and dehydrochlorination reactions relevant to the manufacture of trichloroethene and tetrachloroethene: Part 1. Reaction pathways
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 399, Issues 1–2, 31 May 2011, Pages 1–11
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us