Mo Och Domsjo Aktiebolag

Leif Ake Smedman

Hans Olof Samuelson

Erik Olof Hagglund

Kent Ivar Sondell

Allan Geoffrey Jamieson

Process for improving the selectivity of delignification of lignocellulosic material in the presence of oxygen gas and alkali by maintaining a carbon monoxide content in the gas phase within the range from about 1% to about 12% by volume. The carbon monoxide concentration is maintained by withdrawing carbon monoxide and oxygen gas from the delignification, and separating and recycling withdrawn oxygen gas.

Process for the delignification of lignocellulosic material by

A process is provided for producing cellulose pulp of high brightness, which comprises pulping lignocellulosic material such as wood with oxygen under superatmospheric pressure in two stages, in the first at a pH within the range from about 6 to about 9, and in the second at a more alkaline pH of at least about 10.

Growing community of inventors

Domsjoverken, Sweden

Leif Ake Smedman