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Hydrogenation of western hemlock tannin extracts. Korach, Paul
Abstract
Unpurified Western Hemlock bark tannin extracts were hydrogenated in the presence and absence of alkali, using Raney nickel as a catalyst. The effect of time, temperature, alkali concentration and catalyst was studied by determining the total amount of phenolic substances (ether solubles) and the relative amounts of phenols and phenolic acids. High yields of phenolic compounds, based on the tannin content of the extract were obtained using relatively mild degradation conditions and the presence of alkali was not necessary to obtain these high yields. Catechol and protocatechuic acid were identified by paper chromatography but other substances apparently are also present. The reaction is complex in nature and needs further study especially with respect to the identification of other main products. A mechanism is suggested which explains the results obtained under differing conditions.
Item Metadata
Title |
Hydrogenation of western hemlock tannin extracts.
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1957
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Description |
Unpurified Western Hemlock bark tannin extracts were hydrogenated in the presence and absence of alkali, using Raney nickel as a catalyst.
The effect of time, temperature, alkali concentration and catalyst was studied by determining the total amount of phenolic substances (ether solubles) and the relative amounts of phenols and phenolic acids.
High yields of phenolic compounds, based on the tannin content of the extract were obtained using relatively mild degradation conditions and the presence of alkali was not necessary to obtain these high yields.
Catechol and protocatechuic acid were identified by paper chromatography but other substances apparently are also present.
The reaction is complex in nature and needs further study especially with respect to the identification of other main products. A mechanism is suggested which explains the results obtained under differing conditions.
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Genre | |
Type | |
Language |
eng
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Date Available |
2012-01-12
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0059267
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.