Process for the production of SAP

Details Process for the production of SAP Process for the production of SAP

2008-07-15

2008-07-15

Gravini, S. (Department: 3749)

Drying and gas or vapor contact with solids

Process

Gas or vapor pressure is subatmospheric

Reexamination Certificate

active

07398606

ABSTRACT:
A continuous process for the production of dried superabsorbent polymers (SAPs) the polymerization reaction is carried out either in an initially homogenous aqueous monomer solution (bulk aqueous solution polymerization) or in a heterogeneous water-in-oil reactant mixture (reverse phase suspension or emulsion polymerization) within a continuous closed polymerization reactor, then the resulting polymer gel is dried within a continuous moved bed in a closed dryer, avoiding the needs of standard intermediate maturity tank(s).

REFERENCES:
patent: 3573263 (1971-03-01), Gill
patent: 4138539 (1979-02-01), Landolt et al.
patent: 5891254 (1999-04-01), Coville et al.

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