Verfahren zur Herstellung von Carbonsaeuren
Aliphatic and cycloaliphatic carboxylic acids are prepared by reacting olefines with carbon monoxide in the presence of hydrated boron fluoride as a catalyst, to form a complex which is hydrolysed with at least one mole of water per mole of olefine in the complex, in a plurality of stages at below 1...
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Zusammenfassung: | Aliphatic and cycloaliphatic carboxylic acids are prepared by reacting olefines with carbon monoxide in the presence of hydrated boron fluoride as a catalyst, to form a complex which is hydrolysed with at least one mole of water per mole of olefine in the complex, in a plurality of stages at below 150 DEG F. Preferably, at least three discrete stages are used for the hydrolysis step, in the first of which the complex is hydrolysed with aqueous hydrolysis medium to a mixture of crude carboxylic acid product and dilute boron catalyst (water/BF3 mole ratio of less than 3: 1); in one or more intermediate stages the mixture of crude acid and boron catalyst is diluted with a medium having a water/BF3 mole ratio greater than 15 to 1; and in the final stage or stages the crude acid is washed with the BF3 containing aqueous medium and a water/BF3 mole ratio of greater than 15 to 1 is maintained. Propylene, butylene, pentene, cyclopentene, and cyclohexene and higher homologues and isomers thereof, are mentioned. The hydrolysis steps may be in a plurality of continuous countercurrent mixing-settling zones and suitable apparatus is described. Examples describe the treatment of a propylene trimer (C9 olefine) to form a C10 acid. |
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