| 摘要 |
PURPOSE:To separate and to recover the titled compound useful for producing methylstyene, etc. from 9C aromatic hydrocarbon fraction by simple distillation operation, by oligomerizing selectively trimethylbenzene isomers in the fraction with formaldehyde. CONSTITUTION:In separating and recovering a methylethylbenzene fraction comprising (A) methylethylbenzene isomer as a main component from an aromatic hydrocarbon fraction (raw material) consisting mostly of 9C consisting mostly of 9C containing (A) the methylethylbenzene isomer and (B) a trimethylbenzene isomer having boiling points mutually superimposed, firstly the raw material is reacted with formaldehyde, so 1,3,5-trimethylbenzene which makes distillating separation of the component A from the component B impossible is selectively oligomerized, and separated as a formaldehyde resin having an extremely different boiling point from an unreacted oil. Then, the unreacted oil is fractionated, and a methylbenzene fraction is obtained from the raw material by a simple distillation operation.
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