The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 13, 2012
Filed:
May. 05, 2010
Raed Hashaikeh, Abu Dhabi, AE;
Thomas Qiuxiong HU, Vancouver, CA;
Richard Berry, Notre-Dame-de-L'lle Perrot, CA;
Raed Hashaikeh, Abu Dhabi, AE;
Thomas Qiuxiong Hu, Vancouver, CA;
Richard Berry, Notre-Dame-de-L'lle Perrot, CA;
FPInnovations, Pointe Claire, QC, CA;
Abstract
A method for producing crystalline sulphated cellulose II materials with relatively low degree of polymerization from spent liquors of sulphuric acid (HSO) hydrolysis of cellulose has been discovered. The method involves: 1) separating the spent liquors from the hydrolysed, acid-insoluble, cellulose I materials by dilution from, for example, a 64% HSOhydrolysis medium to a residual sulphuric acid concentration of 10-50% with 0-40% HSO, followed by settling (or centrifuging) and decanting; 2) adding the diluted spent liquors to water or heating the diluted spent liquors at 30-80° C. for ≦48 h; and 3) recovering the recrystallized sulphated cellulose II materials with relatively low degree of polymerization either by filtration and washing or by washing and freeze drying. The method can be used to concurrently produce both crystalline, sulphated cellulose I and the crystalline, sulphated cellulose II materials.