Purification of tocopherols
First Claim
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1. A process for the purification of tocopherol comprising:
- (a) reacting the tocopherol in a tocopherol-containing feed material with a member selected from the group consisting of;
boric acid, an alkoxy boroxine, an alkoxy borate, a phenoxyboroxine, and a phenoxyborate to form a borate tocopherol ester;
(b) distilling the product of (a) to leave the borate tocopherol esters in the residue;
(c) releasing the tocopherol from the borate tocopherol ester left after distillation by reacting the borate tocopherol ester with a member selected from the group consisting of;
water, methanol and ethanol to form the tocopherol and a boron compound;
(d) removing the boron compound formed by the reaction of the water, methanol and ethanol in step (c), and then(e) recovering the released tocopherol after step (d).
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Abstract
Tocopherol homologues found in a tocopherol-containing feed material can be purified by forming a borate tocopherol ester and then distilling the material containing the esterified tocopherol to remove the materials boiling at temperatures lower than the esterified tocopherol. The borate tocopherol esters remaining after distillation are then reacted with a member selected from the group consisting of: Water, methanol, and ethanol to form tocopherol homologues from the borate tocopherol ester, and the boron by product from this reaction is removed. The tocopherol is then recovered by collecting it, distilling it or by any other convenient collection method.
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Citations
8 Claims
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1. A process for the purification of tocopherol comprising:
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(a) reacting the tocopherol in a tocopherol-containing feed material with a member selected from the group consisting of;
boric acid, an alkoxy boroxine, an alkoxy borate, a phenoxyboroxine, and a phenoxyborate to form a borate tocopherol ester;(b) distilling the product of (a) to leave the borate tocopherol esters in the residue; (c) releasing the tocopherol from the borate tocopherol ester left after distillation by reacting the borate tocopherol ester with a member selected from the group consisting of;
water, methanol and ethanol to form the tocopherol and a boron compound;(d) removing the boron compound formed by the reaction of the water, methanol and ethanol in step (c), and then (e) recovering the released tocopherol after step (d). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification