Development and assessment of pseudo-chelates in bleaching pulp paste with H2O2 and in inhibiting equipment corrosion

• Grant number: 97/07395-6
• Support Opportunities: Research Grants - Innovative Research in Small Business - PIPE
• Start date: January 01, 1998
• End date: September 30, 2000
• Field of knowledge: Engineering - Chemical Engineering - Chemical Technology
• Principal Investigator: Hugo Antonio Vilca Melendez
• Grantee: Hugo Antonio Vilca Melendez
• Company: Logos Química Ltda
• City: Barueri

Abstract

New pulp bleaching processes, considered clean technologies meeting the requirements of environmental legislation, use hydrogen peroxide as an oxidizing agent. Nonetheless, they require pre-bleaching of the pulp, using chelates, to remove the transitional metallic ions, such as iron, copper and manganese, which act as stabilizers, preventing the fiber from breaking down (attack on the polysaccharides) in the subsequent treatment with peroxide. This research project intends to develop a new product to be called “pseudo-chelates”, which differs from the traditional chelate DTPA: (Diethylenetriamine pentaacetic acid) and which it is intended to introduce in the Brazilian market. The study proposes to assess the influence of these pseudo-chelates on the efficiency of the bleaching process (increase of whiteness) and the consequent saving of peroxide. The inhibiting action of these compounds on the corrosion of the metals used in the “pre-treatment of the pulp”, bleaching and subsequent stages, will also be assessed. (AU)