Process for extracting urea from a solution with alkenylaromatic

Details Process for extracting urea from a solution with alkenylaromatic Process for extracting urea from a solution with alkenylaromatic

1974-07-05

1977-03-15

Hart, Charles N.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210321B, 210500M, B01D 1500

Patent

active

040123170

ABSTRACT:
An alkenylaromatic polymer is provided derived from 50 to 100 mol % of at least one monomer of the general formula: ##STR1## in which R' represents a hydrogen atom or a methyl radical and R" represents a hydrogen atom or a methyl or ethyl radical, and 0 to 50 mol % of a non-aromatic ethylenically unsaturated monomer, optionally cross-linked by 0.1 to 30 mol %, relative to the monomer of formula (I), of a polyvinyl monomer, 0.01 to 1 .alpha.-ketoaldehyde group of the formula

REFERENCES:
patent: 2974178 (1961-03-01), Hwa et al.
patent: 3382034 (1968-05-01), Kraus
patent: 3531463 (1970-09-01), Gustafson
patent: 3669878 (1971-06-01), Marantz et al.
patent: 3669880 (1972-06-01), Marantz et al.
patent: 3794584 (1974-02-01), Kunin

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