1
Johan Devenyns: A process for delignifying pulp with organic peroxyacid in the presence of phosphonic acids and their salts. Solvay Interox, Spencer & Frank, September 3, 1996: US05552018 (51 worldwide citation)

Process for improving the selectivity of the delignification of a chemical paper pulp by employing a peroxyacid, in which the unbleached pulp originating from the cooking operation is treated with an aqueous solution of this organic peroxyacid in the presence of at least one stabilizer selected from ...


2
Nicholas A Troughton, Fran cedilla ois Desprez, Johan Devenyns, Pierre Ledoux, Rene Detroz: Process for bleaching a pulp in a sequence including an enzyme stage. Solvay Interox, Spencer & Frank, July 8, 1997: US05645686 (16 worldwide citation)

Process for bleaching a chemical paper pulp by means of a sequence of treatment stages involving at least one stage with an enzyme and at least one stage with a peroxyacid.


3
Fran├žois Desprez, Johan Devenyns, Nicholas Troughton, Paul Essemaeker: Multi-stage bleaching process having a final stabilized peroxide stage. Solvay Interox, George H Spencer, Ashley J Wells, Venable, April 24, 2001: US06221209 (7 worldwide citation)

Process for bleaching a chemical paper pulp to a brightness of at least 89┬░ ISO, consisting in subjecting the pulp to a treatment sequence of several stages including a final bleaching stage with hydrogen peroxide in alkaline medium carried out in the presence of at least one stabilising agent and a ...


4
Johan Devenyns, Eric Chauveheid, Lucien Plumet: Method for bleaching paper pulp. Solvay Interox, Larson & Taylor, September 26, 2000: US06123809 (4 worldwide citation)

A process for the delignification and bleaching of chemical pulp utilizes an acid treatment stage aimed at reducing the quantity of hexene uronic acids present in the pulp by at least 30%, and a pH adjustment stage of the pulp aimed at depositing or redepositing ions of alkaline-earth metals on the ...



Click the thumbnails below to visualize the patent trend.