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Dehydration of alcohols in the presence of carbonyl compounds and carboxylic acids in a Fischer–Tropsch hydrocarbons matrix

Paper ID Volume ID Publish Year Pages File Format Full-Text
44167 46006 2006 5 PDF Available
Title
Dehydration of alcohols in the presence of carbonyl compounds and carboxylic acids in a Fischer–Tropsch hydrocarbons matrix
Abstract

The dehydration of alcohols in the presence of carboxylic acids, ketones and aldehydes in Fischer–Tropsch hydrocarbon fractions was investigated over η-alumina at different temperatures and mass hourly space velocities. Quantitative dehydration of the alcohols was achieved while reactions of carbonyl compounds and acids were incomplete and short-lived. At least 70% of the α-olefins in the feed were initially isomerised to internal olefins, while primary alcohols were dehydrated to mostly internal olefins. Over a period of 8 days, at 350 °C and a liquid hourly space velocity of 6 L feed/(L cat h−1), isomerisation of olefins gradually ceased until the fraction of α-olefins equalled the original concentration in the feed (16 mass%) plus the fraction formed from the dehydration of alcohols (8 mass%). The conversion of carbonyl compounds and acids also diminished to a negligible level. The isomerisation activity was linked to catalyst sites which were selectively poisoned by carbonyl compounds and acids. Regeneration of the catalyst with oxygen at a temperature of 480 °C resulted again in removal of carbonyl compounds and acids as well as olefin isomerisation. The alcohol dehydration reaction appeared not to be affected by the poisoning of the catalyst.

Keywords
Alcohol; Dehydration; Carbonyl compound; Ketone; Aldehyde; Carboxylic acid; Olefin isomerisation; Alumina; Catalyst regeneration
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Dehydration of alcohols in the presence of carbonyl compounds and carboxylic acids in a Fischer–Tropsch hydrocarbons matrix
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 300, Issue 1, 20 January 2006, Pages 36–40
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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