METHOD OF MANUFACTURE OF FILTERING MATERIAL AND FILTERING MATERIAL MANUFACTURED BY THIS METHOD Russian patent published in 2007 - IPC B01D39/16 

FIELD: water treatment; production of cation-exchange filters of spatial-globular structure used for complex cleaning of water from cations of heavy metals.

SUBSTANCE: proposed method includes condensation of formaldehyde with sulfo-resorcine followed by hardening; resorcine is added to aqueous solution of formaldehyde and sulfo-resorcine at pH=10-12; mixture thus obtained is kept under conditions ensuring simultaneous pre-condensation of sulfo-resorcine and resorcine with formaldehyde; poly-condensation of preoligomers thus obtained and subsequent hardening are performed in acid medium. Filtering material includes product of condensation of formaldehyde with resorcine in acid medium having spatial globular structure; filtering material contains product of condensation of formaldehyde with sulfo-resorcine and resorcine and additionally it contains functional groups SO₃H characterized on infrared spectrum by absorption of material specimen by bands at minima of 1040 cm^-1 (clearly defined band) and 1190 cm^-1 (slightly pronounced band).

EFFECT: enhanced efficiency of removal of heavy materials from water.

6 cl, 1 dwg, 1 tbl, 4 ex