Abstract
The influence of temperature and water content on pulping of aspen wood with a mixture of acetic and formic acid (Formacell process) was investigated. Selected pulps were bleached using different bleaching concepts. After prebleaching with ozone in acetic acid, peracetic acid bleaching was performed either in butyl acetate, acetic acid or water leading to brightnesses of up to 88% ISO, without addition of alkali. Furthermore, the influence of alkaline extraction and pH on peracetic acid bleaching was investigated. Besides alkaline extraction, the pH proved to be an important parameter. The effects were additive and enabled optimum brightnesses of 93% ISO. In addition to standard procedures, pulps were characterised by their carbohydrate composition, water retention and molar mass distribution. It turned out that different solvents influence the swelling and accessibility of fibres. These effects may he favourably applied for the production of dissolving pulp.
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