US3410923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation process
Assignee: Shell USA Inc
•
Filing: 1963-12-04
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Granted: 1968-11-12
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Expires: 1983-12-04
Abstract
No abstract record available.
Inventors
- 👤 Carl P Strand
- 👤 Gordon D Towell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:23
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D11/00; B01D11/02; B01D11/0215; B01D11/0223; B01D11/0242; B01D11/0246; B01D9/004; C; C07; C07C; C07C7/00; C07C7/14; B01D2011/002; Y; Y10; Y10S; Y10S585/00; Y10S585/919; Y10S585/921; Y10S585/922; Y10S585/924
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
196 words
A CONTINUOUS PROCESS FOR THE RECOVERY OF PARAXYLENE FROM A MULTICOMPONENT LIQUID FEED MIXTURE COMPRISING FROM ABOUT 9 TO 98% BY WEIGHT OF PARAXYLENE IN ADMIXTURE WITH COMPOUNDS HAVING A MELTING POINT BELOW THAT OF PARAXYLENE WHICH COMPRISES: (A) SUBJECTING SAID MIXTURE TO A TEMPERATURE SUFFICIENT TO DORM A SLURRY COMPRISING A CRYSTAL PHASE CONSISTING OF PARAXYLENE AND A LIQUID PHASE COMPRISING THE REMAINING LIQUID COMPONENTS OF SAID FEED AND SOME PARAXYLENE; (B) SEPARATING SAID SLURRY INTO TWO PORTIONS, THE LIQUID PORTION WHICH COMPRISES A LIQUID REJECT AND SUBSTANTIALLY NO CRYSTALS AND A CRYSTAL PORTION WHICH COMPRISES CRYSTALS AND SOME RESIDUAL CONTAMINATING LIQUID FROM THE FEED; (C) INTRODUCING SAID CRYSTAL PORTION TO A WASHING ZONE WHICH COMPRISES A CYLINDRICAL COLUMN CONTAINING A SERIES OF SUBZONES WITH MEANS FOR PRODUCING TOROIDAL FLOW TO LIQUID CONTENTS OF SAID SUBZONES; (D) INTRODUCING A WASHING LIQUID INTO SAID WASHING ZONE COUNTERCURRENT TO THE FLOW OF SAID CRYSTAL PORTION; (E) INTIMATELY CONTACTING SAID CRYSTAL PORTION AS SEPARATE AND DISTINCT PARTICLES WITH SAID WASHING LIQUID IN A TOROIDAL FLOW PATTERN; (F) RECOVERING A LIQUID OVERHEAD COMPRISING SOME WASHING LIQUID AND RESIDUAL CONTAMINATING LIQUID FROM SAID FEED; AND (G) RECOVERING A PARAXYLENE PRODUCT.
Claim 2
Dependent Claim
196 words
A CONTINUOUS PROCESS FOR THE RECOVERY OF PARAXYLENE FROM A MULTICOMPONENT LIQUID FEED MIXTURE COMPRISING FROM ABOUT 9 TO 98% BY WEIGHT OF PARAXYLENE IN ADMIXTURE WITH COMPOUNDS HAVING A MELTING POINT BELOW THAT OF PARAXYLENE WHICH COMPRISES: (A) SUBJECTING SAID MIXTURE TO A TEMPERATURE SUFFICIENT TO DORM A SLURRY COMPRISING A CRYSTAL PHASE CONSISTING OF PARAXYLENE AND A LIQUID PHASE COMPRISING THE REMAINING LIQUID COMPONENTS OF SAID FEED AND SOME PARAXYLENE; (B) SEPARATING SAID SLURRY INTO TWO PORTIONS, THE LIQUID PORTION WHICH COMPRISES A LIQUID REJECT AND SUBSTANTIALLY NO CRYSTALS AND A CRYSTAL PORTION WHICH COMPRISES CRYSTALS AND SOME RESIDUAL CONTAMINATING LIQUID FROM THE FEED; (C) INTRODUCING SAID CRYSTAL PORTION TO A WASHING ZONE WHICH COMPRISES A CYLINDRICAL COLUMN CONTAINING A SERIES OF SUBZONES WITH MEANS FOR PRODUCING TOROIDAL FLOW TO LIQUID CONTENTS OF SAID SUBZONES; (D) INTRODUCING A WASHING LIQUID INTO SAID WASHING ZONE COUNTERCURRENT TO THE FLOW OF SAID CRYSTAL PORTION; (E) INTIMATELY CONTACTING SAID CRYSTAL PORTION AS SEPARATE AND DISTINCT PARTICLES WITH SAID WASHING LIQUID IN A TOROIDAL FLOW PATTERN; (F) RECOVERING A LIQUID OVERHEAD COMPRISING SOME WASHING LIQUID AND RESIDUAL CONTAMINATING LIQUID FROM SAID FEED; AND (G) RECOVERING A PARAXYLENE PRODUCT.
Claim 3
Dependent Claim
183 words
A CONTINUOUS PROCESS FOR THE PURFICATION OF ORGANIC MATERIALS OF DIFFERENT MELTING TEMPERATURES WHICH COMPRISES: (A) SUBJECTING A MIXTURE OF SAID MATERIALS TO A TEMPERATURE SUFFICIENT TO FORM A SLURRY COMPRISING A SOLID PHASE OF SUBSTANTIALLY PURE MATERIAL AND A LIQUID PHASE COMPRISING THE REMAINING LIQUID COMPONENTS OF SAID MIXTURE; (B) SEPARATING SAID SLURRY INTO TWO PORTIONS, THE LIQUID REJECT AND SUBSTANTIALLY NO CRYSTALS AND A CRYSTAL PORTION WHICH COMPRISES CRYSTALS AND SOME RESIDUAL CONTAMINATING LIQUID FROM THE FEED MIXTURE; (C) INTRODUCING SAID CRYSTAL PORTION TO A WASHING ZONE WHICH COMPRISES A CYLINDRICAL COLUMN CONTAINING A SERIES OF SUBZONES WITH MEANS FOR PRODUCING TOROIDAL FLOW TO LIQUID CONTENTS OF SAID SUBZONES; (D) INTRODUCING A WASHING LIQUID INTO SAID COLUMN COUNTERCURRENT TO THE FLOW OF SAID CRYSTAL PORTION; (E) INTIMATELY CONTACTING SAID CRYSTAL PORTION AS SEPARATE AND DISTINCT PARTICLES WITH SAID WASHING LIQUID IN A TOROIDAL FLOW PATTERN; (F) RECOVERING A LIQUID COMPRISING SOME WASHING LLIQUID AND RESIDUAL CONTAMINATING LIQUID FROM SAID FEED AND; (G) RECOVERING A PRODUCT SUBSTANTIALLY FREE OF RESIDUAL CONTAMINATING LIQUID COMPRISING WASH LIQUID AND MATERIAL OF THE SAID CRYSTAL COMPOSITION.
Claim 4
Dependent Claim
183 words
A CONTINUOUS PROCESS FOR THE PURFICATION OF ORGANIC MATERIALS OF DIFFERENT MELTING TEMPERATURES WHICH COMPRISES: (A) SUBJECTING A MIXTURE OF SAID MATERIALS TO A TEMPERATURE SUFFICIENT TO FORM A SLURRY COMPRISING A SOLID PHASE OF SUBSTANTIALLY PURE MATERIAL AND A LIQUID PHASE COMPRISING THE REMAINING LIQUID COMPONENTS OF SAID MIXTURE; (B) SEPARATING SAID SLURRY INTO TWO PORTIONS, THE LIQUID REJECT AND SUBSTANTIALLY NO CRYSTALS AND A CRYSTAL PORTION WHICH COMPRISES CRYSTALS AND SOME RESIDUAL CONTAMINATING LIQUID FROM THE FEED MIXTURE; (C) INTRODUCING SAID CRYSTAL PORTION TO A WASHING ZONE WHICH COMPRISES A CYLINDRICAL COLUMN CONTAINING A SERIES OF SUBZONES WITH MEANS FOR PRODUCING TOROIDAL FLOW TO LIQUID CONTENTS OF SAID SUBZONES; (D) INTRODUCING A WASHING LIQUID INTO SAID COLUMN COUNTERCURRENT TO THE FLOW OF SAID CRYSTAL PORTION; (E) INTIMATELY CONTACTING SAID CRYSTAL PORTION AS SEPARATE AND DISTINCT PARTICLES WITH SAID WASHING LIQUID IN A TOROIDAL FLOW PATTERN; (F) RECOVERING A LIQUID COMPRISING SOME WASHING LLIQUID AND RESIDUAL CONTAMINATING LIQUID FROM SAID FEED AND; (G) RECOVERING A PRODUCT SUBSTANTIALLY FREE OF RESIDUAL CONTAMINATING LIQUID COMPRISING WASH LIQUID AND MATERIAL OF THE SAID CRYSTAL COMPOSITION.
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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) | 1971-11-12 | 1972-05-13 | 1972-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-12 | 1976-05-13 | 1976-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-12 | 1980-05-13 | 1980-11-12 | $7700.00 | Window Closed / Lapsed |