| abstract |
1448919 Distilling heat-sensitive organic compounds HAARMANN & REIMER GmbH 6 Dec 1974 [7 Dec 1973 6 Nov 1974] 52841/74 Heading B1D [Also in Division C2] Heat sensitive compounds are distilled by means of a superheated solvent vapour, the resulting compound-loaded solvent vapour being condensed by counter-current contact with condensed solvent to obtain a saturated solution of the compound which is at a temperature not more than 3‹C below its boiling point. The distillation of 4-hydroxy benzaldehydes optionally substituted by one or more C 1 -C 4 alkoxy groups is described. The solvent may be hexane, cyclohexane, benzene, toluene, ethyl benzene or anisol. Distillation temperatures of 110- 220‹C are specified. |