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α-生育酚和α-生育酚醋酸酯的制备
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摘要
本文对α-生育酚及α-生育酚醋酸酯的制备工艺进行了研究。α-生育酚的制备包括以含量为52.3%的混合生育酚为原料制备非α-生育酚甲基胺盐以及非α-生育酚甲基胺盐的氢解还原。
     通过考察反应温度、反应时间、胺试剂的选择及用量、反应物料的比例及非α-生育酚胺甲基化物的分离精制方法对反应的影响,得到制备非α-生育酚甲基胺盐的工艺条件是:反应温度为80℃,反应时间为40min,胺反应试剂为二甲胺,物料的摩尔比n(混合生育酚):n(二甲胺):n(甲醛)=1:3:3,反应转化率可达98.20%,反应产物胺甲基物用乙酸乙酯萃取后,边搅拌边慢慢滴加磷酸至pH值为4.1,使之生成非α-生育酚甲基胺盐,再冷却到0℃结晶,过滤得到胺盐晶体。
     在对非α-生育酚甲基胺盐的氢解还原制备α-生育酚的工艺过程中,采用羟甲基化-还原法相结合,即两个反应一步完成的方法。将胺盐溶解于正庚烷中加入高压釜,以5%的钯炭催化剂为氢解反应的催化剂,用量为胺盐质量的5.0%,对甲苯磺酸为羟甲基化催化剂,用量为胺盐质量的3.4%,加入多聚甲醛用量为胺盐质量的25.1%,在氢气压力2.6MPa,温度170℃下反应2h。反应结束待产物冷却后从高压釜中移出,过滤后经真空旋转蒸发将溶剂除去,得到精制的α-生育酚,非α-生育酚甲基胺盐转化率为99.54%,α-生育酚含量为93.60%,收率为90.58%。
     以含量为93.60%的α-生育酚为原料制备α-生育酚醋酸酯,考察了反应时间、反应温度、醋酸酐与α-生育酚的摩尔比及催化剂种类等因素对酯化反应的影响。通过实验,得到制备α-生育酚醋酸酯的优化工艺条件为:醋酸酐与α-生育酚的摩尔比为1.8~2:1,催化剂选用对甲苯磺酸,对甲苯磺酸用量为α-生育酚的0.3%,反应温度为95℃,乙酰化反应时间为1h,得到α-生育酚醋酸酯。在该反应条件下,α-生育酚的转化率可达到99.48%,反应选择性为98.81%,α-生育酚醋酸酯的收率可达到98.30%。
Preparation ofα-tocopherol andα-tocopheryl acetate were studied in this paper. The preparation ofα-tocopherol related to two parts: the preparation of non-α-aminomethylated tocopherol salts and then subjected to hydrogenolysis.
     Non-α-aminomethylated tocopherol salts were produced from raw material of 52.3% tocopherols mixture. The following factors were considered in this process: reaction temperature, reaction time, selected of amic reagent, ratio of reactants and the separating method of non-α-aminomethylated tocopherol salts. And the optimal technological conditions were obtained: reaction temperature 80℃, reaction time 40min, amic reagent was dimethylamine, the molar ratio of tocopherols mixture, dimethylamine and formaldehyde were 1:3:3, translation rate was up to 98.20%, then the product was extracted by ethylacetate, and then phosphoric acid was added dropwise with stirring until pH value was 4.1, non-α-aminomethylated tocopherol salts were formed. The solution was heated to reflux, and cooled to 0℃,crystalline products were obtained.
     Hydroxymethylation-reduction was combined with aminoalkylation-reduction in the process of hydrogenolysis of non-α-aminomethylated tocopherol salts. Non-α-aminomethylated tocopherol salts was dissolved in n-heptane and charged to an autoclave with 5% Pd/C hydrogenolysis catalyst and hydroxymethylation catalyst toluene-p-sulfonic acid, the quality ratio of Pd/C, toluene-p-sulfonic acid, paraformaldehyde and non-α-aminomethylated tocopherol salts was 5.0:3.4:25.1:100. Hydrogenolysis was carried out at 170℃for 2 hours at 2.6MPa hydrogen pressure. The product was cooled, removed from the autoclave, filtered and the solvent removed under vacuum to yieldα-tocopherol, translation rate of non-α-aminomethylated tocopherol salts was 99.54%, purity ofα-tocopherol was 93.60%, yield was 90.58%.
     α-tocopheryl acetate was produced from raw material of 93.6%α-tocopherol, the following factors were considered: reaction time, reaction temperature, the molar ratio of acetate anhydride andα-tocopherol and the kinds of catalyst. The optimal technological conditions were obtained: reaction time was 1h, reaction temperature 95℃,the molar ratio of acetate anhydride andα-tocopherol was 1.8~2:1, the ratio of esterification catalyst toluene-p-sulfonic acid toα-tocopherol was 0.27g/100g, andα-tocopheryl acetate was formed,the reaction translation rate was up to 99.48%, selectivity was 98.81% and the yield 98.30%.
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