Process for the purification of benzaldehyde
AssigneeStamicarbon B.V.
InventorCornelis Jongsma
Life of this patent
Estimating the term…
Abstract
A process for the purification in the presence of water of impure benzaldehyde by which a purified benzaldehyde is prepared which has improved color stability and improved olfactory characteristics. The process is comprised of the steps of treating the impure benzaldehyde simultaneously with water and a metal less noble than hydrogen followed by distillation.
Claims20
Process for the purification in the presence of water of impure benzaldehyde including odiferous impurities comprising the steps of:
- (a) reacting said impure benzaldehyde simultaneously with water and at least one metal less noble than hydrogen in Groups IA, IIA, IIB, IIA, IVA, and VIII of the periodic table of elements at conditions of temperature and pressure sufficient to eliminate at least a substantial portion of said odiferous impurities and wherein at least a portion of said metal is consumed in the reaction, and
- (b) distilling said reacted benzaldehyde.
The process of claim 12, wherein a maximum of about 5000 mmoles of base is added per kg of benzaldehyde.
The process of claim 13, wherein a maximum of 500 mmoles of base is added per kg of benzaldehyde.
Process for the purification in the presence of water of impure benzaldehyde including odiferous impurities comprising the steps of:
- (a) admixing said impure benzaldehyde and said water,
- (b) passing said admixture of step (a) over a bed containing solid particles of at least one metal less noble than hydrogen in Groups IA, IIA, IIB, IIIA, IVA, and VIII of the periodic table of elements to purify said impure benzaldehyde, wherein said admixture and said bed are maintained at conditions of temperature and pressure sufficient to eliminate at least a substantial portion of said impurities and at least a portion of said metal in said bed is consumed, and
- (c) distilling said purified benzaldehyde.
Process for the purification in the presence of water of impure benzaldehyde including odiferous impurities comprising the steps of,
- (a) reacting said impure benzaldehyde simultaneously with a base free water and at least one metal less noble than hydrogen in Groups IA, IIA, IIB, IIIA, IVA, and VIII of the periodic table of elements at conditions of temperature and pressure sufficient to eliminate at least a substantial portion of said odiferous impurities and wherein at least a portion of said metal is consumed in the reaction, and,
- (b) distilling said reaction mixture of step (a) without previous separation of liquid phases.
Dependencies are inferred from the claim text.