| 摘要 |
PURPOSE:To obtain the titled compound useful as a raw material of polyurethane, in high activity, without causing the corrosion of the apparatus, by carrying out the depolymerization of polyoxytetramethylene glycol using a catalyst comprising a heteropolyacid containing a specific amount of water coordinated or mixed to the acid. CONSTITUTION:Tetrahydrofuran is produced by the depolymerization of polyoxytetramethylene glycol (PTMG), using a catalyst comprising a heteropolyacid (e.g. phosphomolybdic acid, phosphotungstic acid, etc.) containing <=15mol of water coordinated or mixed to 1mol of the acid. The amount of the heteropolyacid is preferably >=0.1wt%, especially >=1wt% of the PTMG, and the reaction is carried out at 50-200 deg.C, preferably 80-150 deg.C. The process is also useful to obtain a PTMG having sharp molecular weight distribution. |
