Electricite De France

Institut Polytechnique De Grenoble

Centre Technique De L'industrie Des Papiers, Cartons Et Celluloses

Gérard Mortha

Michel Petit-Conil

Yves Bertrand

Nathalie Marlin

Jennifer Marcon

Céline Martin

Auphelia Burnet

Auphélia Burnet

The present invention relates to a method for bleaching an unbleached or pre-bleached paper pulp comprising at least the following consecutive steps: a) preparing an unbleached or pre-bleached paper pulp having a pH of at least 8, b) bringing the paper pulp obtained at the end of step a) into contact with chlorine dioxide, c) when the pH of the paper pulp obtained from step b) is lower than 10, adding at least one Br&#xf8;nsted base to the paper pulp, d) adding hydrogen peroxide to the paper pulp obtained at the end of step c), e) maintaining the paper pulp obtained at the end of step d) in a first bleaching tower, f) optionally, adding sulphuric acid to the paper pulp obtained at the end of step e) and maintaining the obtained paper pulp in a second bleaching tower, the method dispensing with the need for a step of washing the paper pulp before the end of step e), and, if applicable, before the end of step f).

Method for bleaching paper pulp

A method is provided for maintaining an electric cable, said electric cable comprising at least one electric conductor surrounded by an outer sheath, said outer sheath containing an insulating oil distributed around said electric conductor, such as a fluid-oil cable or an oil-filled cable. A drying oil, selected so as to solidify upon contacting the air, is added to the oil of the cable for sealing off any accidental oil leak through an outer sheath of the electric cable.

Maintenance of electric cables by self-repairing

Growing community of inventors

Laissaud, France

Gérard Mortha