Separation of solids from aqueous suspensions using modified amine functional polymers
AssigneeAir Products and Chemicals, Inc.
InventorsJohn G. Smigo, Thomas P. McAndrew, Robert K. Pinschmidt, Jr., Andrew F. Nordquist
Life of this patent
Estimating the term…
Abstract
Polyvinylaminals, optionally as the formed copolymer with polyvinylhemiaminals and polyvinylacetals are useful as separating agents and are provided by reacting a poly(vinylamine) or a copolymer containing vinyl alcohol and vinylamine units with a monoaldehyde. The aldehyde, such as butyraldehyde, can be introduced into the polymer aminalization as a liquid or gas, generally in a proportion of about 0.02 to 0.5 mol per mol of alcohol and amine units in the polymer chain. These polymers, especially as the cationic salt, perform very well in the flocculation, settling, clarification and dewatering of wastewater.
Claims14
In a process for separating solids from an aqueous suspension, the improvement comprising adding to said suspension as a separating agent an amine functional polyvinylaminal which is the reaction product of monoaldehyde and poly(vinylamine).
In a process for separating solids from an aqueous suspension, the improvement comprising adding to said suspension an effective amount of an amine functional polymer containing aminal, hemiaminal and acetal groups having monomeric units randomly joined in the proportions and structures indicated by the formula:
- ##STR5## wherein m, n, x, y and z are integers which added together equal a sum,
- m is 0 to 15 percent of said sum,
- n is 0 to 94 percent of said sum,
- x is 0 to 30 percent of said sum,
- y is 1 to 95 percent of said sum,
- z is 1 to 60 percent of said sum;
- A and D are each 0 or NR.sup.2
- R is H, C.sub.1 -C.sub.11 alkyl, phenyl or --CF.sub.3,
- R.sup.1 is H or methyl,
- R.sup.2 is H or C.sub.1 -C.sub.4 alkyl or hydroxyalkyl and
- R.sup.3 is H, C.sub.1 -C.sub.20 alkyl, phenyl, or hydroxyphenyl.
A method of treating wastewater which comprises adding to at least one stage of the treating process an amine functional polyvinylaminal which is the reaction product of monoaldehyde and poly(vinylamine).
Dependencies are inferred from the claim text.