C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
202/101, 31/90,
C07C 409/24 (2006.01)
Patent
CA 1080463
PROCESS FOR THE PREPARATION OF ORGANIC SOLUTIONS OF PERGARBOXYLIC ACIDS ABSTRACT OF THE DISCLOSURE A process for the continuous preparation of organic solutions of percarboxylic acids by reaction of an aqueous solution of hydrogen peroxide with the corresponding car- boxylic acid in the presence of an acid, water-soluble catalyst which boils above 160°C, extraction of the per- carboxylic acid from the resulting reaction mixture using an organic solvent which is immiscible with water, recon- centration of the raffinate,which essentially contains hydrogen peroxide and the acid catalyst, by distilling off water in a distillation column and recycle of the raffinate, concentrated in this way, into the reaction with the carboxylic acid. The raFfinate is devided into two partial streams in a ratio of 1 to 25 : 1. The raffinate is fed to a distillation column which is operated under reduced pressure and which has at least two take-off weirs as tray inserts, the first take-off weir being at least two theoretical plates above the sump phase, the second take-off weir being arranged at least two theoretical plates above the first take-off weir and the section of column betwen the second take-off weir and the top of the column having at least two theoretical plates. The larger partial stream of the raffinate is passed into the column below the first take-off weir and the smaller partial stream is passed into the column below the second take-off weir. Water is removed at the top of the distillation column. A first side stream, which essentially contains the hydrogen peroxide from the small partial stream of the raffinate from the extraction, is with- drawn from the second take-off weir and is a 2 to 40% strength by weight aqueous solution of hydrogen peroxide, which is optionally fed, together with the larger partial stream of the raffinate from the extraction, into the column below the first take-off weir, A second side stream is withdrawn from the first take-off weir and is an aqueous solution of the acid catalyst which optionally can be further worked up and re-used. The re-concentrated aqueous solution of hydrogen peroxide and acid catalyst, withdrawn as a sump product from the distllation, is recycled into the reaction with carboxylic acid. A third side stream can be taken from a third take-off weir which is arranged not more than 2 theoretical plates below the first take-off weir. -1a-
251301
Hofen Willi
Prescher Gunter
Siekmann Gerd
Wolf Gunter
Aktiengesellschaft Bayer
Deutsche Gold Und- Silber-Scheideanstalt Vormals Roessler
Na
LandOfFree
Process for the preparation of organic solutions of... 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 preparation of organic solutions of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the preparation of organic solutions of... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-724194