Disproportionation of unsaturated acids in rosin or tall oil

Details Disproportionation of unsaturated acids in rosin or tall oil Disproportionation of unsaturated acids in rosin or tall oil

1986-03-06

1987-04-21

Cockeram, Herbert S.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 98, 260 995, C09F 100

Patent

active

046595139

ABSTRACT:
The process relates to a method of improving the color and/or reducing the oxidized acids content of the disproportionated product obtained by heating rosin acids in rosin and tall oil with a catalyst comprising iodine, an iron compound and ammonia, an ammonium salt or an amine. The improvement comprises a pretreatment step in which the starting material is heated with an effective amount not in excess of 0.5% by weight of elemental sulphur, based on the weight of starting material for a period, usually less than one hour. As little as 0.1% by weight of sulphur is sufficient in most cases.

REFERENCES:
patent: 4481145 (1984-11-01), Timms

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