Method of producing improved amine salts of lignosulfonates

Details Method of producing improved amine salts of lignosulfonates Method of producing improved amine salts of lignosulfonates

1987-04-16

1988-05-31

Nielsen, Earl

Chemistry: natural resins or derivatives; peptides or proteins;

Lignins or derivatives

Aldehyde, ketone or ozone reacted with a lignin or lignin...

530505, C07G 100

Patent

active

047482354

ABSTRACT:
A method of producing an amine-containing salt of a sulfonated lignin compound which may be effectively spray-dried for use in dry form comprising the steps of methylolating a lignin at an alkaline pH, lowering the pH of the methylolated lignin to precipitate the lignin, washing the precipitated lignin at an acid pH to remove impurities, sulfonating the methylolated lignin in the presence of a sulfur-oxygen-containing compound, an amine compound, and ammonium hydroxide and/or ammonium sulfite or bisulfite to produce an amine/ammonium salt thereof, and heating and spray-drying the sulfonated lignin amine/ammonium salt to effectively evaporate ammonia therefrom to produce the sulfonated lignin amine-containing salt in dry form.

REFERENCES:
patent: 3407188 (1968-10-01), Cavagna
patent: 3505243 (1970-04-01), Steinberg et al.
patent: 4047567 (1977-09-01), Childs et al.
patent: 4444562 (1984-04-01), Lin
patent: 4590262 (1986-05-01), Dilling
patent: 4629469 (1986-12-01), Dilling
patent: 4636224 (1987-01-01), Dilling
patent: 4642336 (1987-02-01), Dilling

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