The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 07, 2002
Filed:
Oct. 26, 2000
SK Corporation, Seoul, KR;
Abstract
Disclosed is a method for preparing DL-&agr;-tocopherol with a high yield through the condensation of isophytol or phytol derivatives with trimethylhydroquinone (TMHQ) in the presence of a Zn—Al heterogeneous catalyst system. At 80 to 120° C., the condensation is carried out for 2 to 7 hours in the presence of a Zn(II) ion-coated alumina-silica catalyst in an n-heptane solvent. The synthetic Zn(II) ion-coated silica-alumina synthetic catalyst system can remarkably reduce side-reactions upon the condensation of isophytol or phytol derivatives and TMHQ, thus producing DL-&agr;-tocopherol with a high purity at a high yield. In addition, the catalyst system is greatly convenient to handle and therefore apply for continuous reactions for the preparation of DL-&agr;-tocopherol. With these advantages, the catalyst system can be effectively used in preparing highly pure DL-&agr;-tocopherol at a high yield on a commercial scale.