Method for producing cellulose sulfoacetate derivatives and products and mixtures thereof
AssigneeInstitut National de la Recherche Agronomique (INRA)
InventorsGaelle Chauvelon, Luc Saulnier, Alain Buleon, Jean-Francois Thibault
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Abstract
A method for directly producing a mixture of cellulose sulfoacetate derivatives by esterification of cellulosic material, characterized in that it comprises the following steps i) the cellulosic material is suspended in a glacial acetic acid solution and the excess acetic acid is eliminated ii) the cellulosic acid that is swollen with acetic acid is suspended in a sulfuric acid solution in glacial acetic acid and iii) the cellulose material is made to react by adding acetic anhydride.
Claims17
Process for directly producing a blend of water soluble cellulose sulfoacetates through esterification of a cellulose, comprising the steps of:
- (i) suspending the cellulose in a solution containing glacial acetic acid and eliminating the excess acetic acid,
- (ii) suspending the cellulose swollen with acetic acid from step (i) in a mixture of sulphuric acid solution and glacial acetic acid, and
- (iii) reacting the cellulose by adding the acetic anhydride, characterized in that:
- the acetic anhydride quantity is about 3.2 mols/mol of anhydroglucose,
- the esterification time ranges from 1 to 60 minutes, and
- the esterification temperature is about 40° C.
Dependencies are inferred from the claim text.