| abstract |
The invention relates to a method for producing acetals from polyols by the succession of two reactions in a one-pot process, namely firstly hydroformylation of olefins with transition metal phosphine complex catalysts in multiphase systems, the catalytic C-C linking reaction being carried out in the multiphase mixture in the presence of phosphines and diphosphines with sub-group elements such as cobalt or rhodium at temperatures between 0 and 200°C, and the molar transition metal/phosphine rations for the complex catalysts being between 1 : 0.5 and 1 : 100, and secondly acetals are produced in the one-pot process by the secondary reaction of the synthesized aldehydes with polyols under acidic conditions, an extension of the carbon chain of the olefin by more than one C atoms as the polyol leading to an increase of the gross calorific value of the products and to a reduction of the evaporation temperature with respect to the polyol. The invention also relates to the use of the acetals as fuels or fuel additives, as solvents or as detergents. The use of olefins > C3 during hydroformylation allows results to be obtained especially for the acetalizing of glycerol that meet industrial requirements. |