Sodra Skogsagarna Ekonomisk Forening

Södra Cell Aktiebolag Ab

Lenzing Aktiengesellschaft

Sodra Cell Ab

Johannes Bogren

Andrea Borgards

Harald Brelid

Gabriele Schild

Jim Parkås

Jim Parkas

Tobias KÖHNKE

A process for separation of the cellulosic part from a raw material composition comprising polyester and cellulose is provided. A blend is prepared comprising a raw material composition comprising polyester and cellulose and a hydrolyzing liquor wherein the hydrolyzing liquor comprises a first mixture comprising an alkaline solution containing hydroxide ions. The hydrolyzing liquor is added to give the blend an effective alkali concentration in a range from 5 g/l to 150 g/l, wherein the effective alkali concentration is calculated as NaOH, and the hydrolyzing liquor:raw material composition ratio is from 1.5:1 up to 25:1 and keeping the blend at a temperature of 100° C. or above.

Process for separation of the cellulosic part from a polyester and cellulose composition

The invention relates to processes for manufacturing pulp and more specifically to improved processes for manufacturing dissolving pulp. The processes have primarily been developed to be used in connection with large scale kraft processes, i.e. they have been designed to be incorporated into a plant. A liquor derivable from the process and comprising xylan, lignin, alkali and water is also disclosed as well as a dissolving pulp produced by the process.

Process and a dissolving pulp manufactured by the process

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Göteborg, Sweden

Johannes Bogren