Synthesis of polyols suitable for castor oil replacement
OwnerJonathan M. Curtis, Tolibjon S. Omonov +1inventors
InventorsJonathan M. Curtis, Tolibjon S. Omonov, Ereddad Kharraz
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Abstract
A method for the preparation of polyol from an unsaturated TAG oil that can function similarly to castor oil in certain applications. The method comprises controlled epoxidation of the TAG oil with an acid and an oxidizing agent to obtain a partially epoxidized TAG oil with desired iodine and oxirane values; hydroxylating the partially epoxidized TAG oil using a monoalcohol and a solid acid catalyst to obtain the polyol. The resulting polyols are comprised of a triglyceride structure and hydroxyl values, viscosities, and colors that are similar to castor oil.
Claims20
A method for the preparation of polyols from an unsaturated triacylglycerol (TAG) oil, consisting essentially of the steps of:
- (a) partially epoxidizing the unsaturated TAG oil, having an iodine value greater than about 120, with an acid and an oxidizing agent to obtain a partially epoxidized TAG oil which is still unsaturated;
- and
- (b) hydroxylating the partially epoxidized TAG oil using an monoalcohol and an acid catalyst to obtain hydroxylated and unsaturated TAG polyols, comprising monomeric and dimeric, but not oligomeric, TAG polyols.
A composition comprising hydroxylated and unsaturated monomeric and dimeric, but not oligomeric, triacylglycerol polyols having the following properties:
- (a) a hydroxyl value ranging from about 110 mgKOH/g to about 210 mgKOH/g;
- (b) a viscosity of between about 0.4 Pa·s to about 2.5 Pa·s;
- (c) an iodine value of between about 55 to about 90;
- or
- (d) an acid value of less than about 1.0 mg KOH/g.
Dependencies are inferred from the claim text.