Process for preparation of 4,4,8,8,10-pentamethylbicyclo[4,4,0]-decene-(1,6)-one(2)
AssigneeHuls Aktiengesellschaft
InventorWilfried Buschken
Life of this patent
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Abstract
4,4,8,8,10-pentamethylbicyclo[4,4,0]-decene-(1,6)-one(2), is produced from the bottom product of the acetone condensation reaction collecting in the production of isophorone by fractionation. A ketone blend consisting essentially of C.sub.15 compounds where the main components are isomers [B] and [C] as shown in the general formulas: ##STR1## is isolated. This ketone blend is selectively hydrated in the presence of a noble metal catalyst at hydrogen pressures of 20 to 250 mbars and at temperatures between 25.degree. and 150.degree. C. The 4,4,8,8,10-pentamethylbicyclo[4,4,0]-decene-(1,6)-one(2) is obtained by rectifying the hydration output.
Claims21
A process for preparing 4,4,8,8,10-pentamethylbicyclo [4,4,0]-decene-(1,6)-one(2), comprising:
- (a) carrying out a condensation reaction of acetone to isophorone in a pressure distillation reaction column having a bottom product wherein a pressure of about 30 atmospheres gage is maintained in said column having a head temperature of about 205 degrees Centigrade and a sump temperature of about 235 degrees Centigrade;
- (b) fractionalizing said bottom product at pressures between 1 and 100 mbars and a head temperature of about 125 to 145 degrees centigrade and isolating ketone blend consisting essentially of C.sub.15 compounds comprising predominantly isomers [B] and [C] having the following general formulas:
- ##STR5## (c) selectively hydrating said isolated ketone blend in the presence of a noble metal catalyst selected from the group consisting of platinum and palladium at hydrogen pressures of 20 to 250 bars and at temperatures between 25.degree. and 150.degree. C. to produce a hydrated output;
- and
- (d) separating said 4,4,8,8,10-pentamethylbicyclo [4,4,0]-decene-(1,6)-one(2) from said hydrated output.
A process for preparing 4,4,8,8,10-pentamethylbicyclo [4,4,0]-decene-(1,6)-one(2), from a ketone blend consisting essentially of C.sub.15 compounds comprising predominantly isomers [B] and [C] having the following general formulas:
- ##STR6## comprising:
- (a) selectively hydrating said ketone blend in the presence of a noble metal catalyst selected from the group consisting of platinum and palladium at hydrogen pressures of 20 to 250 bars and at temperatures between 25.degree. and 150.degree. C. to produce a hydrated output;
- and
- (b) separating said 4,4,8,8,10-pentamethylbicyclo [4,4,0]-decene-(1,6)-one(2) from said hydrated output.
Dependencies are inferred from the claim text.