Process for bleaching cellulosic material

Abstract

Abstract A process and equipment are described which, in a combination of measures, comprise: a) generating an ozone-containing gas (3) in an ozone generator (1) by silent electrical discharge in air or oxygen, b) compressing the ozone-containing gas and producing an aqueous, ozone-enriched solution (rich water) under pressure in an absorption vessel (4), c) letting down the rich water in a let-down zone (9), a gas of high O3 content (rich gas) (12) being released, d) diluting the rich gas with a gas free of ozone or low in oxygen, e) mixing (13) the resulting gas with the materials (14) to be bleached and converting the mixture in a bleaching zone (16), and f) degassing (18) the bleach suspension of material, washing (21) and working up the solid material. <IMAGE>

Inventors

• 👤 Michael Dr. Sinner
• 👤 Karl Dr. Schwarzl

Bibliographic Details