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Etherification of glycerol with tert -butyl alcohol catalysed by ion-exchange resins
Klepáčová, K., Mravec, D. and Bajus, M. Etherification of glycerol with tert -butyl alcohol catalysed by ion-exchange resins Chemical Papers, Vol.60, No. 3, 2006, 224-230
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Document type:
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Článok z časopisu / Journal Article |
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Collection:
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Chemical papers
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| Author(s) |
Klepáčová, K.
Mravec, D.
Bajus, M.
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| Title |
Etherification of glycerol with tert -butyl alcohol catalysed by ion-exchange resins
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| Journal name |
Chemical Papers
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| Publication date |
2006
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| Year available |
2006
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| Volume number |
60
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| Issue number |
3
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| ISSN |
0366-6352
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| Start page |
224
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| End page |
230
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| Place of publication |
Poland
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| Publisher |
Versita
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| Collection year |
2006
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| Language |
english
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| Subject |
250000 Chemical Sciences
250300 Organic Chemistry
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| Abstract/Summary |
The reaction of glycerol with tert-butyl alcohol in the liquid phase on acid Amberlyst-type ion-exchange resins was studied. The influence of temperature, mole ratio n(TBA)/n(G), water and swelling of gel, and macroreticular type of polymer catalysts on etherification reaction was investigated. The most favourable reaction temperature is 75°C. The conversion of glycerol and yield of glycerol tert-butyl ethers has increased with the mole ratio n(TBA)/n(G). Dry form of macroreticular catalysts provided the best results. Etherification reaction of glycerol with isobutylene in non-aqueous conditions gives the highest yield of desired ethers. The influence of water was studied. The gel forms of ion-exchange resins have very low catalytic activity. It can be concluded that water has an inhibition effect on ion-exchange resins. By comparing the gel and macroreticular forms of Amberlyst ion-exchange resins it can be concluded that very acid forms of macroreticular ion-exchange resins with a high degree of crosslinking are more active catalysts for the studied reaction due to their pores which are sufficiently large so that the voluminous tert-butyl ethers of glycerol can be formed. It was estimated that tert-butyl alcohol as tert-butylation agent is not suitable for etherification of glycerol with the formation of di-and triethers.
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