| 摘要 |
PCT No. PCT/SE91/00589 Sec. 371 Date Mar. 24, 1993 Sec. 102(e) Date Mar. 24, 1993 PCT Filed Sep. 9, 1991 PCT Pub. No. WO91/10633 PCT Pub. Date Jul. 25, 1991.Process for the production of di-trimethylolpropane (di-TMP), which comprises subjecting a solution containing less than 3 per cent by weight, preferably less than 1 per cent by weight of water, free trimethylolpropane (TMP) and/or partial ester between TMP and a monocarboxylic acid or its anhydride having 1-4 carbon atoms in the chain, which partial ester on average contains 1.0-2.5, preferably 1.0-2.0 ester groups per molecule to an etherification reaction by heating to 50 DEG -200 DEG C., preferably 70 DEG -190 DEG C. in the presence of an acid catalyst in solid state or in dissolved state until at most 30%, preferably at most 15% of the total content of free TMP and partial ester of TMP in the solution has been etherified to free di-TMP and partial ester of di-TMP respectively, at the same time continuously removing etherification water formed at the etherification reaction under vacuum at a pressure of 0.1-200 mm Hg, preferably 0.1-50 mm Hg or by an azeotropic distillation by means of a compound such as hexane, toluene, xylene or the like forming an azeotropic mixture, and recovering free di-TMP and di-TMP bonded as a partial ester respectively from the reaction mixture in a suitable way. |
