萃取-精馏法从乙烯焦油中提取β-甲基萘

Isolation of β-methylnaphthalene from ethylene tar through extraction-rectification

介绍了一种从乙烯焦油中提取β-甲基萘的方法,研究了以乙烯焦油230～250℃馏分为原料,利用萃取-精馏相结合的方法提取β-甲基萘。结果表明,采用浓度为80%的硫酸作溶剂萃取原料中的喹啉类物质和吲哚,萃取后喹啉类为痕量,吲哚从2.06%减小到0.08%。萃取后的馏分进行精馏得到纯度96.73%的β-甲基萘,产品收率接近60%。该法与精馏、结晶、重结晶的工艺相比得到的β-甲基萘杂质含量低、纯度高。

Isolation of β-methylnaphthalene from the 230～250℃ fractions of ethylene tar was studied by using an extraction-rectification method.The quinoline compounds and indole in the ethylene tar were firstly extracted with 80% sulfuric acid,through which the extracted residue contains only trace amount of quinoline,and the amount of indole is reduced from 2.06% to 0.08%.The extracted ethylene tar was then rectified yielding β-methylnaphthalene with 96.73% purity and an yield close to 60%.Compared with the distillation,crystallization and recrystallization process,the current method provides β-methylnaphthalene with lower impurity content and higher purity.