A PROCESS AND APPARATUS FOR MODIFICATION OF LIGNOCELLULOSIC MATERIALS AND PRODUCTS OF MODIFIED LIGNOCELLULOSIC MATERIALS OBTAINED BY THE PROCESS
Canada Patent
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Abstract
A process and apparatus for the preparation of a modified lignocellulosic material by - treating the lignocellulosic material in a first activator zone having an atmosphere of one or more acid anhydrides in vapour form in a gas at a gauge pressure of 0 50 kPag and a temperature of 100 160 °C, and then - treating the lignocellulosic material in a second reactor zone having an atmosphere of a gas at a gauge pressure of 0 50 kPag and a temperature of 120 190 °C, thereafter - stripping the lignocellulosic material with steam or water in a stripper zone, and - optionally further processing. The process is more efficient as compared with the prior art processes by providing a better access of the acid anhydrides to the sites of the reactive lignocellulosic hydroxyl groups (-OH), which are located on the internal surfaces of pores and capillary channels in the lignocellulose. Furthermore, the apparatus is relatively simple. This makes the inventive process and apparatus suitable for a cost-efficient preparation of modified lignocellulosic fibre in industrial scale.
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