{"title":"从非α -生育酚制备天然α -生育酚。","authors":"Yi-Wen Yang, Guang-Dong Wen, Cai-Juan Wu, Qi-Long Ren, Ping-Dong Wu","doi":"10.1631/jzus.2004.1524","DOIUrl":null,"url":null,"abstract":"<p><p>Non-alpha-tocopherols are hydroxymethylated and hydrogenated to produce alpha-tocopherol in one pot process by simultaneously reacting with paraformaldehyde and hydrogen in the presence of catalysts of benzenesulfonic acid and 5% Pd/C in an autoclave. Effects of various operation conditions have been studied. The preferable reaction conditions are: temperature 180 degrees C to 200 degrees C, pressure 5.0 MPa, acid concentration 0.5 g/100 ml ethanol, mass ratio of Pd/C to tocopherols 7.1 g/100 g, and reaction time 5.0 h. A product with alpha-tocopherol content of 80% was obtained by using a raw material with a total tocopherols content of 80.54%. The conversion of non-alpha-tocopherols is almost 100%, and the mole yield of alpha-tocopherol is more than 90%.</p>","PeriodicalId":85042,"journal":{"name":"Journal of Zhejiang University. Science","volume":"5 12","pages":"1524-7"},"PeriodicalIF":0.0000,"publicationDate":"2004-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1631/jzus.2004.1524","citationCount":"1","resultStr":"{\"title\":\"Preparation of natural alpha-tocopherol from non-alpha-tocopherols.\",\"authors\":\"Yi-Wen Yang, Guang-Dong Wen, Cai-Juan Wu, Qi-Long Ren, Ping-Dong Wu\",\"doi\":\"10.1631/jzus.2004.1524\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>Non-alpha-tocopherols are hydroxymethylated and hydrogenated to produce alpha-tocopherol in one pot process by simultaneously reacting with paraformaldehyde and hydrogen in the presence of catalysts of benzenesulfonic acid and 5% Pd/C in an autoclave. Effects of various operation conditions have been studied. The preferable reaction conditions are: temperature 180 degrees C to 200 degrees C, pressure 5.0 MPa, acid concentration 0.5 g/100 ml ethanol, mass ratio of Pd/C to tocopherols 7.1 g/100 g, and reaction time 5.0 h. A product with alpha-tocopherol content of 80% was obtained by using a raw material with a total tocopherols content of 80.54%. The conversion of non-alpha-tocopherols is almost 100%, and the mole yield of alpha-tocopherol is more than 90%.</p>\",\"PeriodicalId\":85042,\"journal\":{\"name\":\"Journal of Zhejiang University. Science\",\"volume\":\"5 12\",\"pages\":\"1524-7\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2004-12-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1631/jzus.2004.1524\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Zhejiang University. Science\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1631/jzus.2004.1524\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Zhejiang University. Science","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1631/jzus.2004.1524","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Preparation of natural alpha-tocopherol from non-alpha-tocopherols.
Non-alpha-tocopherols are hydroxymethylated and hydrogenated to produce alpha-tocopherol in one pot process by simultaneously reacting with paraformaldehyde and hydrogen in the presence of catalysts of benzenesulfonic acid and 5% Pd/C in an autoclave. Effects of various operation conditions have been studied. The preferable reaction conditions are: temperature 180 degrees C to 200 degrees C, pressure 5.0 MPa, acid concentration 0.5 g/100 ml ethanol, mass ratio of Pd/C to tocopherols 7.1 g/100 g, and reaction time 5.0 h. A product with alpha-tocopherol content of 80% was obtained by using a raw material with a total tocopherols content of 80.54%. The conversion of non-alpha-tocopherols is almost 100%, and the mole yield of alpha-tocopherol is more than 90%.
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