Wood treatment with ammoniacal liquor and carbon dioxide

Details Wood treatment with ammoniacal liquor and carbon dioxide Wood treatment with ammoniacal liquor and carbon dioxide

B - Operations, Transporting

27

K

117/102, 6/18

B27K 3/08 (2006.01) B27K 3/32 (2006.01)

Patent

CA 1043191

WOOD TREATMENT WITH AMMONIACAL LIQUORS AND CARBON DIOXIDE ABSTRACT OF THE DISCLOSURE A method of preventing the deposition of preserva- tive solids onto the surface of the material being treated from an ammoniacal treating liquor of the type wherein de- position of the treating chemical within the wood requires evaporation of the ammonia from the solution. After the im- pregnation treatment the wood is contacted with an atmosphere containing carbon dioxide in an amount and for a time suf- ficient for the carbon dioxide to combine with a significant amount of the ammonium hydroxide in the treating liquor on the wood to form ammonium carbonate and/or bicarbonate and thereby inhibit the loss of ammonia from the liquor for a time suf- ficient for the liquor on the wood to migrate into the wood.

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