US4345039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of recovering polyester fibers and cellulosic powder from polyester/cotton textile waste
Assignee: VENTURE CHEMICALS Inc 106 BOARD ROAD LAFAYETTE LOUISIANA 70508 A TX CORP
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Filing: 1981-06-01
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Granted: 1982-08-17
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Expires: 2001-06-01
Abstract
Abstract A method of recovering useful polyester fibers and cellulosic material from textile wastes containing blended polyester/cellulosic fibers wherein the textile waste is treated with anhydrous hydrochloric acid gas under reaction conditions sufficient to degrade the cellulosic material, the treated waste is mechanically degraded to convert the reacted cellulosic material to a fine powder, and thereafter the cellulosic material is separated from the polyester fibers.
Inventors
- 👤 Jack C. Cowan
- 👤 Tommy Thrash
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:14
CPC Classifications
C; C08; C08J; C08J11/00; C08J11/04; C08J11/10; C08J11/16; B; B29; B29B; B29B17/00; B29B17/02; B29K; B29K2001/00; B29K2067/00; B29L; B29L2031/00; B29L2031/726; C08J2301/00; C08J2301/02; C08J2367/00; C08J2367/02; Y; Y02; Y02P; Y02P20/00; Y02P20/141; Y02P20/143; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
103 words
A method for recovering polyester fibers and cellulosic material in useful form from textile wastes containing blended polyester/cellulosic fibers comprising treating the textile waste with from about 0.3% to about 3% by weight of the cellulosic material in the waste of anhydrous hydrochloric acid gas at a temperature in the range from about ambient to about 180° F. for a period from about 5 minutes to about 48 hours, mechanically degrading the reacted cellulosic material to a fine powder, and separating the polyester fibers from the reacted cellulosic material, wherein said cellulosic material is selected from the group consisting of cotton and rayon.
Claim 2
Independent Claim
103 words
A method for recovering polyester fibers and cellulosic material in useful form from textile wastes containing blended polyester/cellulosic fibers comprising treating the textile waste with from about 0.3% to about 3% by weight of the cellulosic material in the waste of anhydrous hydrochloric acid gas at a temperature in the range from about ambient to about 180° F. for a period from about 5 minutes to about 48 hours, mechanically degrading the reacted cellulosic material to a fine powder, and separating the polyester fibers from the reacted cellulosic material, wherein said cellulosic material is selected from the group consisting of cotton and rayon.
Claim 3
Dependent Claim
59 words
The method of claim 1 wherein said textile waste is treated with anhydrous hydrochloric acid gas in an amount from about 1% to about 3% by weight of the cellulosic material in the waste at a temperature in the range from about 100° F. to about 180° F. for a period from about 5 minutes to about one hour.
Claim 4
Independent Claim
13 words
The method of claims 1 or 2 wherein said cellulosic material is cotton.
Claim 5
Independent Claim
18 words
The method of claims 1 or 2 wherein said treating and said mechanically degrading steps are conducted simultaneously.
Claim 6
Independent Claim
35 words
The method of claims 1 or 2 wherein said separating step is conducted utilizing a compressed gas, wherein said treating and said mechanically degrading steps are conducted simultaneously, and wherein said cellulosic material is cotton.
Claim 7
Independent Claim
106 words
A method of separating the polyester from the cellulosic material in textile wastes containing resin treated, blended polyester and cellulosic fibers which comprises treating the textile waste with from about 0.3% to about 3% by weight of the cellulosic material in the waste of anhydrous hydrochloric acid gas at a temperature in the range from about ambient to about 180° F. for a period from about 5 minutes to about 48 hours, mechanically degrading the reacted cellulosic material to a fine powder, and separating the polyester fibers from the reacted cellulosic material, wherein said cellulosic material is selected from the group consisting of cotton and rayon.
Claim 8
Independent Claim
106 words
A method of separating the polyester from the cellulosic material in textile wastes containing resin treated, blended polyester and cellulosic fibers which comprises treating the textile waste with from about 0.3% to about 3% by weight of the cellulosic material in the waste of anhydrous hydrochloric acid gas at a temperature in the range from about ambient to about 180° F. for a period from about 5 minutes to about 48 hours, mechanically degrading the reacted cellulosic material to a fine powder, and separating the polyester fibers from the reacted cellulosic material, wherein said cellulosic material is selected from the group consisting of cotton and rayon.
Claim 9
Dependent Claim
59 words
The method of claim 6 wherein said textile waste is treated with anhydrous hydrochloric acid gas in an amount from about 1% to about 3% by weight of the cellulosic material in the waste at a temperature in the range from about 100° F. to about 180° F. for a period from about 5 minutes to about one hour.
Claim 10
Independent Claim
13 words
The method of claims 6 or 7 wherein said cellulosic material is cotton.
Claim 11
Independent Claim
18 words
The method of claims 6 or 7 wherein said treating and said mechanically degrading steps are conducted simultaneously.
Claim 12
Independent Claim
36 words
The method of claims 6 or 7 wherein said separating step is conducted utilizing a compressed gas, wherein said treating step and said mechanically degrading step are conducted simultaneously, and wherein said cellulosic material is cotton.
References Cited (Backward Citations)
US3937671A
Cited
US3937675A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-16 | 1986-02-15 | 1986-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-16 | 1990-02-15 | 1990-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-16 | 1994-02-15 | 1994-08-17 | $7700.00 | Window Closed / Lapsed |