US2015233055A1PendingUtilityA1

Dissolving-Grade Pulp Compositions

Assignee: CELANESE ACETATE LLCPriority: Feb 19, 2014Filed: Oct 30, 2014Published: Aug 20, 2015

Est. expiryFeb 19, 2034(~7.6 yrs left)· nominal 20-yr term from priority

Inventors:Denis G. Fallon Leslie Allen Dinesh K. Arora Monica Boatwright Christopher M. Bundren Michael T. Combs Bin Li Rongfu Li Jay Mehta Tianshu Pan

B01D 11/0288D21H 11/00

PatentIndex Score

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References

Claims

Abstract

Dissolving-grade pulp compositions are prepared by treating a cellulosic material with an extractant comprising a cellulose solvent and co-solvent. The dissolving-grade pulp compositions comprise at least 90 wt. % glucan, from 0.6 to 5 wt. % xylan, and have distinct molecular weights, and elemental metal ions from known and commercially available dissolving-grade pulp compositions.

Claims

exact text as granted — not AI-modified

We claim: 
     
         1 . A dissolving-grade pulp composition comprising at least 90 wt. % glucan and from 0.6 to 5 wt. % xylan, wherein the composition has a weight-average molecular weight of at least 500,000 g/mol. 
     
     
         2 . The composition of  claim 1 , wherein the composition comprises less than 175 ppm sodium. 
     
     
         3 . The composition of  claim 1 , wherein the composition comprises less than 25 ppm sodium. 
     
     
         4 . The composition of  claim 1 , wherein the dissolving-grade pulp is a hardwood dissolving-grade pulp. 
     
     
         5 . The composition of  claim 1 , wherein the dissolving-grade pulp is a softwood dissolving-grade pulp. 
     
     
         6 . The composition of  claim 1 , wherein the composition further comprises from 1 to 2 wt. % mannan. 
     
     
         7 . The composition of  claim 1 , wherein the composition comprises from 1.1 to 5 wt. % mannan. 
     
     
         8 . The composition of  claim 1 , wherein the composition further comprises arabinan and galactan. 
     
     
         9 . The composition of  claim 1 , wherein the composition has a weight-average molecular weight from 500,000 to 3,000,000 g/mol. 
     
     
         10 . The composition of  claim 1 , wherein the composition has a number-average molecular weight from 150,000 to 600,000 g/mol. 
     
     
         11 . The composition of  claim 1 , wherein the composition has a number-average molecular weight from 175,000 to 450,000 g/mol. 
     
     
         12 . The composition of  claim 1 , wherein the composition has a Z-average molecular weight from 900,000 to 50,000,000 g/mol. 
     
     
         13 . The composition of  claim 1 , wherein the composition comprises less than 7 ppm silicon. 
     
     
         14 . The composition of  claim 1 , wherein the composition comprises less than 10 ppm potassium. 
     
     
         15 . The composition of  claim 1 , wherein the composition comprises less than 0.01 wt. % dichloromethane extractables. 
     
     
         16 . The composition of  claim 1 , wherein the weight ratio of xylan to mannan is from 1:1 to 3:1. 
     
     
         17 . The composition of  claim 1 , wherein the weight ratio of xylan to mannan is less than 1:2. 
     
     
         18 . A dissolving-grade pulp composition comprising at least 90 wt. % glucan and from 0.6 to 5 wt. % xylan, wherein the composition comprises less than 175 ppm sodium. 
     
     
         19 . The composition of  claim 18 , wherein the composition comprises less than 25 ppm sodium. 
     
     
         20 . The composition of  claim 18 , wherein the weight ratio of xylan to mannan is from 1:1 to 3:1.

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