Process for the isolation of p-hydroxybenzaldehyde

Details Process for the isolation of p-hydroxybenzaldehyde Process for the isolation of p-hydroxybenzaldehyde

C - Chemistry, Metallurgy

07

C

260/574

C07C 45/82 (2006.01) C07C 45/36 (2006.01) C07C 45/78 (2006.01) C07C 45/80 (2006.01) C07C 45/81 (2006.01) C07C 47/565 (2006.01)

Patent

CA 1297131

ABSTRACT OF THE INVENTION The invention relates to a process for the isolation of p- hydroxybenzaldehyde from the reaction mixture obtained by oxidizing p-cresol with oxygen or oxygen-containing gases in methanol in the presence of Na or K hydroxide and an Nn, Ni, Cr or Co salt. The procedure in this process is optionally to add water to the reaction mixture, to heat the resulting solution and to filter off the precipitated Mn, Ni, Cr or Co oxide- hydrate, to remove the methanol from the filtrate by distillation, to cool the residual aqueous solution and thus to allow the p-hydroxybenzaldehyde to crystallize out in the form of the Na or K salt. Alternatively, the reaction mixture is first dried by atomization, the soluble constituents of the dry substance are then dissolved in hot water, the undissolved Mn, Ni, Cr or Co oxide-hydrate is filtered off and the salt of p- hydroxybenzaldehyde is again allowed to crystallize out by cooling the filtrate. A further method consists in diluting the reaction mixture with methanol, filtering off the undissolved Nn, Ni, Cr or Co oxide-hydrate, drying the filtrate by atomization, dissolving the resulting dry substance in hot water, and again, allowing the p-hydroxybenzaldehyde to crystallize out as the Na or K salt by cooling the solution.

514175

Affiliated with

Also associated with

Rating

Process for the isolation of p-hydroxybenzaldehyde does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the isolation of p-hydroxybenzaldehyde, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the isolation of p-hydroxybenzaldehyde will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1175261