Organic compounds -- part of the class 532-570 series – Organic compounds – Carbohydrates or derivatives
Patent
1977-04-11
1979-03-06
Levin, Stanford M.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carbohydrates or derivatives
C08B 514
Patent
active
041432266
ABSTRACT:
A process for preparing a cellulose sulfate ester by reacting a hydrated cellulose containing about 4 to about 12 percent by weight of water with dinitrogen tetroxide or nitrosyl chloride in the presence of a proton acceptor and a reaction solvent which is a swelling or solubilizing agent for a reaction product. Alternatively, the cellulose reactant may contain less than about 4 percent by weight of water by washing hydrated cellulose containing in excess of 4 percent of water with a highly polar aprotic solvent to reduce the water content.
A process for simultaneously preparing a sulfate ester of cellulose and an alkyl nitrite by reacting a nitrite ester of cellulose with sulfur trioxide or a complex thereof to obtain a mixed nitrite:sulfate ester which is reacted with an organic alcohol containing up to about 10 carbon atoms.
A process for simultaneously preparing a sulfate ester of cellulose and a mixture of an organic nitrite and an inorganic nitrate by reacting a cellulose nitrite ester with sulfur trioxide or a complex thereof to obtain a mixed nitrite:sulfate ester in the presence of dinitrogen tetroxide with water then being added and neutralizing by addition of a base.
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