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US4254258A
Expired / Lapsed
US
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Process for the preparation of cellulose ether derivatives
Assignee: Texas A&M University System
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Filing: 1979-03-28
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Granted: 1981-03-03
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Expires: 1999-03-28
Abstract
Abstract There is disclosed an improved process for preparing cellulose ether derivatives which in pertinent part accomplishes this by providing for the uniform distribution of caustic and etherifying reagents over the exposed area of fiberized, never-dried, non-purified natural polysaccharide materials by fluidizing said materials while simultaneously contacting the material with said reagents.
Inventors
- 👤 Donald F. Durso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:15
CPC Classifications
C; C08; C08B; C08B11/00; C08B1/00; C08B1/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
83 words
A process for the preparation of cellulose ether derivatives from a never-dried, non-purified natural cellulose material comprising: fiberizing said natural material; fluidizing said fiberized material; contacting said fluidized material with a caustic reagent to form a soda cellulose; and contacting said fluidized material with an etherifying reagent; wherein said fiberizing and fluidizing steps are performed substantially simultaneously; and wherein said contacting of said fluidized material with said caustic reagent and said contacting said fluidized material with an etherifying reagent are performed substantially simultaneously.
Claim 2
Dependent Claim
83 words
A process for the preparation of cellulose ether derivatives from a never-dried, non-purified natural cellulose material comprising: fiberizing said natural material; fluidizing said fiberized material; contacting said fluidized material with a caustic reagent to form a soda cellulose; and contacting said fluidized material with an etherifying reagent; wherein said fiberizing and fluidizing steps are performed substantially simultaneously; and wherein said contacting of said fluidized material with said caustic reagent and said contacting said fluidized material with an etherifying reagent are performed substantially simultaneously.
Claim 3
Dependent Claim
34 words
The process of claim 1 wherein the total reaction time, including caustic reagent contacting time, ranges from about 100 to about 5 minutes with a respective reaction temperature ranging from 55° to 95° C.
Claim 4
Dependent Claim
43 words
The process of claim 1 wherein the mole ratio of cellulose material to caustic reagent is in the range of about 1.0:2.0 to about 1.0:2.95 and wherein the mole ratio of cellulose material to etherifying reagent is from about 1.0:1.2 to about 1.0:1.9.
Claim 5
Dependent Claim
15 words
The process of claim 3 including the step of recovering said prepared cellulose ether derivatives.
Claim 6
Dependent Claim
128 words
A process for the preparation of cellulose ether derivatives from a never-dried, non-purified natural cellulose material comprising the following steps which are performed substantially simultaneously: fiberizing said material; fluidizing said fiberized material; contacting said fluidized material with an atomized mist of a caustic reagent to form a soda cellulose, wherein the mole ratio of fluidized material to caustic reagent is in the range of about 1.0:2.0 to about 1.0:2.95; and contacting said fluidized material with an atomized mist of a etherifying reagent, wherein the mole ratio of fluidized material to etherifying reagent is from about 1.0:1.2 to about 1.0:1.9; wherein the total reaction time, including caustic reagent contacting time, ranges from about 100 to about 5 minutes with a respective reaction temperature ranging from 55° to 95° C.
Claim 7
Dependent Claim
128 words
A process for the preparation of cellulose ether derivatives from a never-dried, non-purified natural cellulose material comprising the following steps which are performed substantially simultaneously: fiberizing said material; fluidizing said fiberized material; contacting said fluidized material with an atomized mist of a caustic reagent to form a soda cellulose, wherein the mole ratio of fluidized material to caustic reagent is in the range of about 1.0:2.0 to about 1.0:2.95; and contacting said fluidized material with an atomized mist of a etherifying reagent, wherein the mole ratio of fluidized material to etherifying reagent is from about 1.0:1.2 to about 1.0:1.9; wherein the total reaction time, including caustic reagent contacting time, ranges from about 100 to about 5 minutes with a respective reaction temperature ranging from 55° to 95° C.
Claim 8
Dependent Claim
20 words
The process of claim 5 wherein said caustic reagent is sodium hydroxide and wherein said etherifying reagent is chloroacetic acid.
Claim 9
Dependent Claim
143 words
In a process for the preparation of cellulose ether derivatives from the reaction of a cellulosic material with a caustic to form soda cellulose followed by the reaction of said soda cellulose with an etherifying reagent to form a cellulose ether, the improvement comprising: utilizing a never-dried, non-purified natural cellulosic material; fiberizing said material; fluidizing said fiberized material; contacting said fluidized material with an atomized mist of a caustic reagent to form soda cellulose; and contacting said fluidized material with an atomized mist of an etherifying reagent; wherein the total reaction, including caustic reagent contacting time ranges from about 100 to about 5 minutes with a respective reaction temperature ranging from about 55° to 95° C.; wherein said cellulosic material is fiberized and fluidized substantially simultaneously; and wherein said fluidized material is contacted substantially simultaneously with said caustic reagent and said etherifying reagent.
Claim 10
Dependent Claim
143 words
In a process for the preparation of cellulose ether derivatives from the reaction of a cellulosic material with a caustic to form soda cellulose followed by the reaction of said soda cellulose with an etherifying reagent to form a cellulose ether, the improvement comprising: utilizing a never-dried, non-purified natural cellulosic material; fiberizing said material; fluidizing said fiberized material; contacting said fluidized material with an atomized mist of a caustic reagent to form soda cellulose; and contacting said fluidized material with an atomized mist of an etherifying reagent; wherein the total reaction, including caustic reagent contacting time ranges from about 100 to about 5 minutes with a respective reaction temperature ranging from about 55° to 95° C.; wherein said cellulosic material is fiberized and fluidized substantially simultaneously; and wherein said fluidized material is contacted substantially simultaneously with said caustic reagent and said etherifying reagent.
Claim 11
Dependent Claim
43 words
The process of claim 7 wherein the mole ratio of fluidized material to caustic reagent is in the range of about 1.0:2.0 to about 1.0:2.95 and wherein the mole ratio of fluidized material to etherifying material ranges from about 1.0:1.2 to about 1.0:1.9.
Claim 12
Dependent Claim
20 words
The process of claim 8 wherein said caustic reagent is sodium hydroxide and wherein said etherifying reagent is chloroacetic acid.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |