D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
23/211, 9/36
D21C 11/10 (2006.01) C01B 21/20 (2006.01) C01B 21/24 (2006.01) C01B 21/36 (2006.01) D21C 11/00 (2006.01)
Patent
CA 1240812
PROCESS FOR PRODUCING NITROGEN OXIDES FROM AQUEOUS WASTE CELLULOSE PULP LIQUOR CONTAINING NITROGEN COMPOUNDS ABSTRACT OF THE DISCLOSURE A process is provided for producing nitrogen oxides from including oxygen linked to nitrogen in the molecule, which includes initiating an autocatalytic reaction generating nitrogen oxide in a liquid phase comprising aqueous waste cellulose pulp liquor containing nitrogen compounds including oxygen linked to nitrogen in the molecule at a temperature within the range from about 40 to about 180°C and at an acid pH within the range from about 0 to about 5 in the presence of nitrate ion NO3- in a concentration calculated as nitrogen within the range from about 0.2 to about 5 gram moles per kilogram of water and of lignin in a weight ratio lignin:water within the range from about 0.001:1 to about 1:1; and then continuing the autocatalytic reaction while maintaining a gas phase in contact with the liquid phase having a partial pressure of nitrogen oxide within the range from about 0.005 MPa to about 2 MPa, and withdrawing nitrogen oxide from the gas phase so as to maintain said partial pressure.
477764
Macrae & Co.
Mo Och Domsjo Aktiebolag
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