US4582650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation with encapsulated co-catalyst
Assignee: Monsanto Co
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Filing: 1985-02-11
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Granted: 1986-04-15
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Expires: 2005-02-11
Abstract
Abstract Processes are given for which a microcrystalline support having a noble metal located within its pores, is used as a permselective catalyst to oxidize formaldehyde and similar materials while avoiding poisoning by N-phosphonomethylamines. The permselective catalyst can be used as a co-catalyst with activated carbons in the oxidation of N-phosphonomethyliminodiacetic acid to N-phosphonomethylglycine.
Inventors
- 👤 Timothy R. Felthouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:17
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/064; B01J29/068; B01J23/00; B01J23/38; B01J23/40; C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3808; C07F9/3813; B01J29/18; B01J29/20; B01J29/22; B01J31/00; B01J31/02; B01J31/0272; Y; Y02; Y02P; Y02P20/00; Y02P20/50
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
104 words
The method of oxidizing formaldehyde or formic acid in the presence of an N-phosphonomethyl amine which comprises contacting a liquid solution containing formaldehyde or formic acid and an N-phosphonomethylamine with oxygen in the presence of a catalyst comprising a microporous support with a noble metal oxidation catalyst located within the pores of such support, with the support being a microporous acid resistant aluminosilicate having an Si to Al ratio of at least 2 and with the microporous support being selectively permeable so as to inhibit contact of the N-phosphonomethylamine with the noble metal therein, at a temperature sufficiently elevated to effect the desired oxidation.
Claim 2
Independent Claim
104 words
The method of oxidizing formaldehyde or formic acid in the presence of an N-phosphonomethyl amine which comprises contacting a liquid solution containing formaldehyde or formic acid and an N-phosphonomethylamine with oxygen in the presence of a catalyst comprising a microporous support with a noble metal oxidation catalyst located within the pores of such support, with the support being a microporous acid resistant aluminosilicate having an Si to Al ratio of at least 2 and with the microporous support being selectively permeable so as to inhibit contact of the N-phosphonomethylamine with the noble metal therein, at a temperature sufficiently elevated to effect the desired oxidation.
Claim 3
Dependent Claim
40 words
The method of claim 1 in which the formaldehyde or formic acid are produced as by-products in an oxidative cleavage reaction of an N-phosphonomethylamine to produce a different N-phosphonomethylamine compound, with such reaction involving use of an active carbon catalyst.
Claim 4
Dependent Claim
16 words
The process of claim 1 in which the aluminosilicate is a zeolite of the mordenite class.
Claim 5
Dependent Claim
33 words
The process of claim 1 in which the catalyst is a zeolite containing platinum crystallites within the pores and generally of diameters no greater than 20 Å as measured by transmission electron microscopy.
Claim 6
Dependent Claim
37 words
The method of claim 1 in which the noble metal catalyst is used as a co-catalyst along with activated carbon catalyst to effect oxidative cleavage of N-phosphonomethyliminodiacetic acid to N-phosphonomethylglycine and concurrent oxidation of the formaldehyde by-product.
Claim 7
Dependent Claim
26 words
The method of claim 5 in which the oxidation is conducted at temperatures of 25° to 200° C. and oxygen pressures of 50 to 20,000 kPa.
Claim 8
Dependent Claim
25 words
The method of claim 5 in which the oxidation is conducted at temperatures of 75° to 150° C. and pressures of 100 to 700 kPa.
Claim 9
Dependent Claim
24 words
The method of claim 1 in which the catalyst has been modified by a chlorosilane compound, a chloro-terminated siloxane oligomer, or a silicone polymer.
Claim 10
Dependent Claim
23 words
The method of claim 1 in which the microporous support is a zeolite characterized by pore openings no greater than about 8 Å.
Claim 11
Dependent Claim
32 words
The method of claim 1 in which the microporous support is characterized by pore openings no greater than about 5 Å and platinum has been incorporated in the zeolite during its preparation.
Claim 12
Independent Claim
103 words
The method of oxidizing formaldehyde of formic acid with a noble metal catalyst in a waste stream which comprises contacting a waste stream containing formaldehyde or formic acid with oxygen in the presence of a catalyst comprising a microporous support with a noble metal catalyst located within the pores of such support, with the support being a microporous, acid resistant aluminosilicate having an Si to Al ratio of at least 2, and with the waste stream also containing a poison for the noble metal and the microporous support being selectively permeable so as to inhibit contact of the poison with the metal therein.
Claim 13
Independent Claim
103 words
The method of oxidizing formaldehyde of formic acid with a noble metal catalyst in a waste stream which comprises contacting a waste stream containing formaldehyde or formic acid with oxygen in the presence of a catalyst comprising a microporous support with a noble metal catalyst located within the pores of such support, with the support being a microporous, acid resistant aluminosilicate having an Si to Al ratio of at least 2, and with the waste stream also containing a poison for the noble metal and the microporous support being selectively permeable so as to inhibit contact of the poison with the metal therein.
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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) | 1989-04-14 | 1989-10-14 | 1990-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-14 | 1993-10-14 | 1994-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-14 | 1997-10-14 | 1998-04-15 | $7700.00 | Window Closed / Lapsed |