Process for production of granular material for water treatment

Details Process for production of granular material for water treatment Process for production of granular material for water treatment

1988-03-14

1990-04-10

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Spheroidizing or rounding of solid particles

252175, 264 49, 264143, B29B 906

Patent

active

049158848

ABSTRACT:
A granular water treatment material and a process for the production thereof, the material being in the form of spherical granules, each having a thermoplastic polymeric matrix (1) and a more dense adjuvant in the form of micro-grains (3) dispersed in the matrix; each granule has on the surface a porosity in the form of micro-cavities (4) and cationic hydrophilic sites distributed on the surface; the process includes providing a mixture of an oxidizable thermoplastic resin and an adjuvant in powdered form, heating the mixture to make it plastic, extruding the plastic material to a diameter corresponding to the size of the granules to be obtained and cutting the extrusions to a length equal to this diameter, achieving a beading of the extruded pieces, oxidizing the surface of the spherical granules thus obtained, then ionically grafting a cationic polyelectrolyte to the surface of said granules.

REFERENCES:
patent: 2862243 (1958-12-01), Farr et al.
patent: 2918701 (1959-12-01), Hull et al.
patent: 3207818 (1965-09-01), Marshall
patent: 3436449 (1969-04-01), Treu et al.
patent: 4385016 (1983-05-01), Gwinn
patent: 4581443 (1986-04-01), Garg
patent: 4606873 (1986-08-01), Biglione et al.

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