Process for the manufacture of porous solids consisting of cross

Details Process for the manufacture of porous solids consisting of cross Process for the manufacture of porous solids consisting of cross

1974-03-14

1976-01-06

Czaja, Donald E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 15, 260 294R, 260 69R, 260 71, C08J 900, C08L 126

Patent

active

039310639

ABSTRACT:
To manufacture porous solids, possessing an internal surface area of more than 10 m.sup.2 /g of crosslinked urea-formaldehyde polycondensation products, an aqueous solution of urea and formaldehyde or of a precondensate of urea and formaldehyde is adjusted to a pH value of 0 to 4 by adding a Bronsted acid having a dissociation constant of not less than 1.times.10.sup..sup.-6, for example sulphamic acid or a water-soluble ammonium hydrogen sulphate, so that an insoluble and infusible precipitate consisting of polymeric condensation product is formed, in the course of which the molar ratio of formaldehyde: urea should be at least 0.5 and at most 1.2 not later than at the time of precipitation. The resulting precipitate is separated off, dried and ground. The powder is suitable for use as an absorbent, for example for effluent purification, or as a white pigment.

REFERENCES:
patent: 3553115 (1971-01-01), Curchod et al.
patent: 3712879 (1973-01-01), Strickrodt et al.
South African Patent Abstract-69/1862, Sept. 17, 1969; (South African Pat. Journal-Oct. 69, p. 199.
Die Makromolekulare Chemie, Band 149, 1971, Seite 1-27, Alfred Renner, "Kondensations Polymere--Harnstoff--Formaldehyde-Oberflache".

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