Process for the preparation of low molecular weight...

Details Process for the preparation of low molecular weight... Process for the preparation of low molecular weight...

C - Chemistry, Metallurgy

07

C

402/131, 403/47,

C07C 31/18 (2006.01) C07C 29/14 (2006.01) C07C 29/141 (2006.01) C07C 29/143 (2006.01) C07C 29/145 (2006.01) C07C 29/38 (2006.01) C07C 45/00 (2006.01) C07C 45/75 (2006.01) C07C 47/19 (2006.01) C07C 49/17 (2006.01) C08G 6/00 (2006.01) C08G 18/30 (2006.01) C08G 18/32 (2006.01) C08G 65/00 (2006.01) C08K 5/053 (2006.01)

Patent

CA 1088523

ABSTRACT OF THE DISCLOSURE A process is disclosed for preparing mixtures of low molecular weight polyhydroxyl compounds and hydroxyaldehydes and hydroxyketones by condensing formaldehyde hydrate with itself in the presence of (I) as catalyst, a soluble or insoluble compound of a metal of the 2nd - 4th main or the 1st-8th sub-group of the Period System of Elements, optionally bound to a high molecular weight carrier, and (II) a cocatalyst prepared by partial oxida- tion of a divalent or higher valent alcohol containing at least 2 adjacent hydroxyl groups and having a molecular weight of between 62 and 242 or of a mixture of such alcohols. The pH of the reaction mixture is held at 6.0 to 9.0 until 5 - 40% conver- sion has occurred and is then lowered to between 4.5 and 8.0 (1 to 2 pH units lower). The reaction is stopped by inactivating the catalyst.

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