METHOD OF CONTINUOUS PRODUCTION OF HIGHLY EFFICIENT AQUEOUS SOLUTIONS OF AMINO FORMALDEHYDE RESIN Russian patent published in 2013 - IPC C08G12/12 C08G12/32 C08G12/38 B01J19/24 

FIELD: chemistry.

SUBSTANCE: invention relates to method of continuous production of aqueous solution of amino formaldehyde resin, solution of urea-formaldehyde resin or melamine-urea-formaldehyde resin. Method includes the following stages: a) preparation of reaction mixture of amino compound and formaldehyde in form of concentrated aqueous solution or in form of solid phase, b) addition of catalyst to reaction mixture, c) carrying out reaction of reaction mixture condensation in presence of catalyst. At stage a) amino compound and formaldehyde are added inform of concentrated aqueous solution or in form of solid phase to total content of solid phase in reaction mixture 40-85 wt % (dry mass relative to total mass of reaction mixture). At stage c) reaction of condensation occurs in continuous flow of reaction mixture in reactor of continuous plug flow reactor. At stage b) catalyst is continuously added and finely crushed into reaction mixture through one or several placed of addition. At non-obligatory stage d) addition of amino compound after condensation is carried out, and at non-obligatory stage e) removal of water to increase solid phase content is carried out. In the method reaction mixture is fed through static mixer of continuous plug flow reactor, which contains pipe, in which there are, at least, 4, preferably, at least, 6 static mixing elements, and it has one or more, preferably several places for addition, preferably, only in place of location of first or first two mixing elements for continuous crushing catalyst through said place (places).

EFFECT: obtaining highly concentrated solution of amino formaldehyde resin in continuous process.

25 cl, 1 dwg, 6 ex