Organic compounds -- part of the class 532-570 series – Organic compounds – Carbohydrates or derivatives
Patent
1994-08-30
1995-12-05
Nutter, Nathan M.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carbohydrates or derivatives
536 56, 536124, 536125, C08B 100, C08B 300
Patent
active
054730619
ABSTRACT:
The process for the treatment of cellulose for activation for subsequent chemical reactions by bringing the cellulose in contact with liquid ammonia at a pressure higher than atmospheric pressure in a pressure vessel and subsequent expansion by rapid reduction of the pressure to atmospheric pressure, is carried out by using a cellulose pulp of an alpha-cellulose content of at least 92 mass %, letting the ammonia act on the pulp at room temperature or at a temperature higher than room temperature, after the expansion, removing the ammonia then still remaining in the pressure vessel except for a minimum content at which the state of activation reached by the action of the ammonia is still maintained and finally replacing the residual ammonia still needed to maintain the state of activation by another swelling or inclusion agent. The process is suitable, also on a large industrial scale, especially for the activation of pulp subsequently to be acetylated and makes possible to achieve a homogenous and high-grade activation. Further, no costly cooling apparatus is needed.
REFERENCES:
patent: 4491661 (1985-01-01), Bredereck et al.
patent: 4734239 (1985-03-01), Diamantoglou et al.
patent: 5177199 (1993-01-01), Kiesewetter et al.
Bredereck Karl
Karstens Ties
Lentz Harro
Steinmeier Hans
Nutter Nathan M.
Rhone-Poulenc Rhodia Aktiengesellschaft
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