Effect of inorganic acid catalyst on the acetosolv pulping of maize stalk

Abstract

Maize stalk is subjected to acetic acid pulping under a variety of conditions such as acetic acid concentration, catalyst (HCl or H 2SO4) concentration, cooking time, temperature and liquor ratio. The maize stalk could not defibered below 70% acetic acid concentration, or without catalyst. Delignification increased with increasing HCl concentration up to 0.5%, yet, in the case of H2SO4, delignification continued over the entire range of catalyst concentration. H2SO4-catalysed acetic acid pulp produced lower kappa number and higher properties than HCl-catalysed acetic acid pulp. On peroxide bleaching, HCl-catalysed acetic acid pulp produced higher brightness properties than H2SO4-catalysed pulp.

Publication Title

Cellulose Chemistry and Technology

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