| abstract |
PURPOSE: To obtain the titled substance, by reacting isobutene and/or tertiary butanol with a formaldehyde source and water in a mixture of an aqueous solution of boric acid and glycol ether while separating the product from the system as a water-containing gaseous mixture. n CONSTITUTION: Isobutene and/or tert-butanol, a formaldehyde source and water are supplied to a lquid mixture of a 30W60wt% aqueous solution of boric acid and a glycol ether of formula (R 1 is H or CH 3 ; R 2 and R 3 are H or 1W4C alkyl; at least one of R 1 WR 3 is alkyl; n is integer of 2W15) (the amount of the ehter is 5W15wt%), and are made to react with each other at 150W220°C while separating the produced isoprene, low boiling by-products and unreacted raw materials from the reaction system as a water-containing gaseous mixture. n EFFECT: Excellent operation stability and long catalytic life. Low initial cost because of the relatively mild reaction condition. n COPYRIGHT: (C)1984,JPO&Japio |