D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
D21H 21/16 (2006.01) C07C 45/90 (2006.01) D21H 17/17 (2006.01)
Patent
CA 2154775
The invention relates to a method for reducing the content of organic solvent in cellulose-reactive hydrophobing agents and use of the products obtained. According to the method the solvent is transferred from the hydrophobing agent to an aqueous phase by dispersing the hydrophobing agent in water. The aqueous dispersion is thereafter contacted with a sorbent or a gas whereby the solvent is transferred from the aqueous phase to the sorbent or the gas. Suitably, the hydrophobing agent is an alkyl ketene dimer, for the preparation of which toluene is generally used. Suitably, the sorbent is a zeolite which can be removed from the dispersion before this is used in papermaking, in particular for hydrophobation of paper. Alternatively, the zeolite can be maintained in the dispersion since the solvent is strongly sorbed on the zeolite surface, whereby only very small amounts of solvent can exist in free form.
Lindgren Erik
Magnusson Jeppe
Eka Nobel Ab
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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