US4047892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid chromatographic analysis for styrene-butadiene monomers
Assignee: Applied Automation Inc
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Filing: 1976-07-01
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Granted: 1977-09-13
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Expires: 1996-07-01
Abstract
Abstract An improved method for the separation of the individual components contained in a process stream consisting essentially of 1,3-butadiene, styrene and cyclohexane is provided which comprises passing a sample of the stream through a silica-filled column in a liquid chromatographic apparatus. The carrier is passed through a drying chamber prior to introducing the carrier onto the column.
Inventors
- 👤 Edward N. Fuller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:53
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/281; B01J20/291; G; G01; G01N; G01N30/00; G01N30/02; G01N30/26; G01N30/28; G01N30/30; B01J2220/00; B01J2220/50; B01J2220/54; G01N33/00; G01N33/44; Y; Y10; Y10T; Y10T436/00; Y10T436/21; Y10T436/212
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
A process for the liquid chromatographic analysis of a mixture of styrene, 1,3-butadiene and cyclohexane which comprises: introducing a sample of said mixture into a chromatographic column having a partitioning material therein which selectively retards passage therethrough of the components of said mixture, drying a carrier fluid by passing same through a drying chamber and thereafter introducing the thus-dried carrier fluid into said column at a predetermined flow rate to carry said mixture through said column to effect separation of said mixture into said styrene, said 1,3-butadiene and said cyclohexane, and thereafter separately determining the quantity of styrene, 1,3-butadiene and cyclohexane.
Claim 2
Dependent Claim
101 words
A process for the liquid chromatographic analysis of a mixture of styrene, 1,3-butadiene and cyclohexane which comprises: introducing a sample of said mixture into a chromatographic column having a partitioning material therein which selectively retards passage therethrough of the components of said mixture, drying a carrier fluid by passing same through a drying chamber and thereafter introducing the thus-dried carrier fluid into said column at a predetermined flow rate to carry said mixture through said column to effect separation of said mixture into said styrene, said 1,3-butadiene and said cyclohexane, and thereafter separately determining the quantity of styrene, 1,3-butadiene and cyclohexane.
Claim 3
Dependent Claim
40 words
The process of claim 1 wherein said partitioning material is a silica gel having a surface area in the approximate range of 250-450 square meters per gram and a particle size in the approximate range of 2 to 40 microns.
Claim 4
Dependent Claim
34 words
The process of claim 1 wherein said partitioning material is a silica gel having a surface area of about 300 square meters per gram and a particle size of about 15 to 37 microns.
Claim 5
Dependent Claim
28 words
The process of claim 1 wherein said carrier is dried by passing same through a bed of molecular sieves having a nominal pore diameter of about 10 angstroms.
Claim 6
Dependent Claim
11 words
The process of claim 1 wherein said carrier fluid is n-hexane.
References Cited (Backward Citations)
US3292420A
Cited
US3549524A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |