乙酸乙酯混合溶剂精制塔拉单宁工艺研究  

Refining of Tara Tannin with Ethyl Acetate Mixed Solvent

作　　者：秦清[1] 徐浩[1] 王金鍫 陈文文[1] 杜运平[1] 张宗和 黄嘉玲 

机构地区：[1]中国林业科学研究院林产化学工业研究所,生物质化学利用国家工程实验室,国家林业局林产化学工程重点开放性实验室,江苏省生物质能源与材料重点实验室,江苏南京210042 [2]南京龙源天然多酚合成厂,江苏南京210032

出　　处：《林产化学与工业》2012年第2期83-86,共4页Chemistry and Industry of Forest Products

基　　金：国家林业局林业公益性行业科研专项(201004013)

摘　　要：用乙酸乙酯萃取精制粗塔拉单宁,粗单宁、水、乙酸乙酯之比1∶1.5∶4(g∶mL∶mL),60℃下萃取30 min,其单宁得率为40.2%,单宁纯度80.4%,得率与纯度均偏低。用乙酸乙酯二次萃取其残留水相得率也偏低。对粗制的塔拉单宁用乙酸乙酯与S溶剂(体积比4∶1)混合溶剂进行精制,其最佳工艺条件是:料液比为m(粗单宁)∶V(水)∶V(混合溶剂)1∶1.5∶5(g∶mL∶mL),萃取温度60℃,萃取时间30 min。在该工艺条件下产品得率68.2%,单宁纯度86.0%,单宁提取率87.7%,得率和纯度都有提高。Crude tara tannin was extracted by water and ethyl acetate at 60 ℃ for 30 min.The ratio of crude tannin-water-ethyl acetate was 1 ∶ 1.5 ∶ 4（g ∶ mL ∶ mL）.The yield of product was 40.2 % and the purity of tannin was 80.4 %.Both yield and purity are low.The yield was still low when ethyl acetate was used to extract the recidual water phase.Refining tara tannin with mixed solvent of ethyl acetate and S-solvent（4 ∶ 1） was studied.The optimum conditions are： solid to liquid ratio of m（crude tara tannin） ∶ V（water） ∶ V（mixed solvent）1 ∶ 1.5 ∶ 5（g ∶ mL ∶ mL）,extraction temperature 60 ℃,extraction time 30 min.Under this condition,the yield of product was 67.1 %-69.0 %,the purity of tannin was 85.3 %-86.5 %,the extraction rate of tannin was 87.2 %-88.6 %.The yield and purity has been improved.

关 键 词：塔拉 单宁 乙酸乙酯 混合溶剂 

分 类 号：TQ35[化学工程]