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US3976704A Expired / Lapsed US ⏱️ 0.0 years remaining

Nitration process

Assignee: Varen Technology
•
Filing: 1975-01-06
•
Granted: 1976-08-24
•
Expires: 1995-01-06
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Abstract

Abstract This invention relates to a process for the nitration of organic compounds, especially aromatic compounds, which comprises contacting said compound with a nitrating agent at conditions whereby a nitrated product is formed. The nitration agent and the compound are substantially separated by means of a polymeric membrane, said polymeric membrane preferably comprising sulfonic acid groups, pendant to the polymeric backbone. In a most preferred embodiment, the membrane is a perfluorosulfonic acid polymer. The use of this most preferred polymeric material as a membrane in the instant process allows the nitration of aromatic organic compounds to take place without the incorporation of strong sulfuric acid in the nitrating agent.

Inventors

  • 👤 Ronald J. Vaughan

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 06:57
CPC Classifications
C; C07; C07C; C07C201/00; C07C201/06; C07C201/08; C07B; C07B43/00; C07B43/02

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 68 words
In a process for the nitration of organic compounds which comprises contacting the organic compound with a nitrating agent at a temperature and pressure sufficient to form a nitrated reaction product, the improvement which comprises maintaining the nitrating agent and the organic compound substantially separated by means of a membrane, said membrane being substantially chemically inert to the action of both the organic compound and the nitration agent.
Claim 2
Dependent Claim 68 words
In a process for the nitration of organic compounds which comprises contacting the organic compound with a nitrating agent at a temperature and pressure sufficient to form a nitrated reaction product, the improvement which comprises maintaining the nitrating agent and the organic compound substantially separated by means of a membrane, said membrane being substantially chemically inert to the action of both the organic compound and the nitration agent.
Claim 3
Dependent Claim 13 words
The process of claim 1 wherein said membrane is a perfluorosulfonic acid polymer.
Claim 4
Dependent Claim 13 words
The process of claim 2 wherein the organic compound is an aromatic compound.
Claim 5
Dependent Claim 21 words
The process of claim 2 wherein said aromatic compound is selected from the group consisting of benzene, toluene, xylene and anisole.
Claim 6
Dependent Claim 12 words
The process of claim 2 wherein said nitration agent comprises nitric acid.
Claim 7
Dependent Claim 22 words
The process of claim 2 wherein said nitration agent comprises from 5 to 100 weight percent nitric acid in an aqueous medium.
Claim 8
Dependent Claim 13 words
The process of claim 6 wherein said nitrating agent additionally comprises sulfuric acid.
Claim 9
Dependent Claim 18 words
The process of claim 2 wherein said perfluorosulfonic acid membrane is in the form of a hollow fiber.
Claim 10
Dependent Claim 18 words
The process of claim 2 wherein said perfluorosulfonic acid membrane has an equivalent weight of 900 to 1700.
Claim 11
Dependent Claim 11 words
The process of claim 2 wherein said aromatic compound is benzene.

References Cited (Backward Citations)

US3887499A Cited
US3714272A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1979-08-24 1980-02-23 1980-08-24 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1983-08-24 1984-02-23 1984-08-24 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1987-08-24 1988-02-23 1988-08-24 $7700.00 Window Closed / Lapsed

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