US3620928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of separating isomers of mononitrotoluene
Assignee: Badger Co Inc
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Filing: 1970-07-13
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Granted: 1971-11-16
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Expires: 1990-07-13
Abstract
Abstract A method of separating isomers of mononitrotoluene by fractional distillation without need for crystallization equipment. Two embodiments are described, one using a single distillating column that is operated in a two-pass blocked out fashion, and the other using two series-connected distillation columns.
Inventors
- 👤 Constantine D Miserlis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:16
CPC Classifications
C; C07; C07C; C07C201/00; C07C201/06; C07C201/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
51 words
A method according to claim 1 wherein said crude feed also contains toluene and said first liquid fraction is recovered from the top section of a distillation column, and further wherein the temperature in said top end is controlled to control the amount of toluene appearing in said first liquid fraction.
Claim 2
Dependent Claim
44 words
A method according to claim 2 wherein the top section of said distillation column includes an internal condenser, and further including cooling part of said first liquid fraction and recycling the same to said condenser whereby to control the temperature in said top end.
Claim 3
Dependent Claim
48 words
A method according to claim 1 wherein said crude feed also includes a higher nitrated compound of toluene, and further including limiting the concentration of said higher nitrated compound in said second bottoms fraction to a value at which said compound is stabilized and will not explosively react.
Claim 4
Dependent Claim
31 words
A method according to claim 4 wherein the concentration of higher nitrated compound in said second bottoms fraction is limited by reducing the rate of recovery of said third liquid fraction.
Claim 5
Dependent Claim
37 words
A method according to claim 4 wherein said second bottoms fraction includes para-mononitrotoluene in an amount sufficient to dilute said higher nitrated compound to a relative concentration at which it is stabilized and will not explosively react.
Claim 6
Dependent Claim
29 words
A method according to claim 6 wherein the relative concentration of said higher nitrated compound in said second bottoms fraction is in the order of 10 percent by weight.
Claim 7
Dependent Claim
23 words
A method according to claim 7 wherein said crude feed and said first bottoms fractions are fractionally distilled in the same distillation column.
Claim 8
Dependent Claim
33 words
A method according to claim 8 wherein said first bottoms fraction is supplied to said distillation column as a feed after all of said crude feed has been fractionally distilled in said column.
Claim 9
Dependent Claim
29 words
A method according to claim 1 wherein said crude feed is distilled in a first distillation stage and said first bottoms fraction is distilled in a second distillation stage.
Claim 10
Dependent Claim
17 words
A method according to claim 1, wherein said fractional distillation is carried out at a reduced pressure.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |