Strong cationic polyelectrolytes in powder form based on acrylamide and quaternized or salified dimethylaminoethyl acrylate for flocculation of solid material suspensions and coalescence of emulsions

Claim 2

Cationic polyelectrolyte in water-soluble powder form, applicable to the coalescence emulsions and/or flocculation of very colloidal hydrophilic suspensions of the organic, mineral, biological, stabilized or digested sludge type with a proportion of volatile materials determined by gaseification of said sludge to be treated in an oven at 575±25° C. as expressed in grams per 100 grams of dry materials contained in said sludge higher than or equal to 50%, said polyelectrolyte comprising a mixture of copolymers of acrylamide and of a cationic monomer of quaternised or salified dimethylaminoethyl acrylate said mixture of copolymers consisting essentially of copolymers each containing in molar proportions at least 60% of cationic units spaced regularly along its copolymer chain; said mixture of copolymers having an intrinsic viscosity higher than 6 dl/g measured at 25° C. or at 30° C. in a molar solution of NaCl and a measured cationicity higher than 94% of the theoretical cationicity.

Claim 3

Cationic polyelectrolyte in water-soluble powder form, applicable to the coalescence and/or flocculation of very colloidal hydrophilic suspensions of the organic, mineral, biological, stabilized or digested sludge type with a proportion of volatile materials determined by gaseification of said sludge to be treated in an oven at 575±25° C. as expressed in grams per 100 grams of dry materials contained in said sludge higher than or equal to 50%, said polyelectrolyte comprising a mixture of emulsion polymerized copolymers of acrylamide and of a cationic monomer of quaternised or salified dimethylaminoethyl acrylate, said mixture of copolymers consisting essentially of copolymers each containing in molar proportions at least 60% of cationic units spaced regularly along its copolymer chain, said mixture of copolymers having an intrinsic viscosity higher than 6 dl/g measured at 25° C. or at 30° C. in a molar solution of NaCl and a measured cationicity higher than 94% of the theoretical cationicity.

Claim 4

Cationic polyelectrolyte in water-soluble powder form, applicable to the coalescence and/or flocculation of very colloidal hydrophilic suspensions of the organic, mineral, biological, stabilized or digested sludge type with a proportion of volatile materials determined by gaseification of said sludge to be treated in an oven at 575±25° C. as expressed in grams per 100 grams of dry materials contained in said sludge higher than or equal to 50%, said polyelectrolyte comprising a mixture of emulsion polymerized copolymers of acrylamide and of a cationic monomer of quaternised or salified dimethylaminoethyl acrylate, said mixture of copolymers consisting essentially of copolymers each containing in molar proportions at least 60% of cationic units spaced regularly along its copolymer chain, said mixture of copolymers having an intrinsic viscosity higher than 6 dl/g measured at 25° C. or at 30° C. in a molar solution of NaCl and a measured cationicity higher than 94% of the theoretical cationicity.

Claim 5

Cationic polyelectrolyte in water-soluble powder form according to claim 1 applicable at the rate of 1 to 5 kg/ton of dry materials to be treated.

Claim 6

Cationic polyelectrolyte in water-soluble powder form according to claim 2 applicable at the rate of 1 to 5 kg/ton of dry materials to be treated.