US3864281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of a dehalogenation catalyst
Assignee: Hoechst AG
•
Filing: 1973-08-13
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Granted: 1975-02-04
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Expires: 1993-08-13
Abstract
Abstract Production of a catalyst comprised of a fine-particulate carrier and palladium metal for the partial dehalogenation of di- and/or trichloracetic acids in the presence of hydrogen to produce monochloracetic acid, wherein the dry porous carrier is impregnated with a palladium salt solution and the palladium absorbed by the carrier is reduced to palladium metal with the use of a suitable reducing agent. More particularly the palladium metal is concentrated exclusively on the surface of the carrier by impregnating and partially saturating the dry, fineparticulate carrier with the pure palladium salt solvent; by continuing impregnation until complete saturation of the carrier so pretreated with the necessary quantity of palladium salt solution; and by reducing the palladium salt applied to the carrier to palladium in known manner.
Inventors
- 👤 Alexander Ohorodnik
- 👤 Klaus Gehrmann
- 👤 Joachim Hundeck
- 👤 Hermann Vierling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:19
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/347; C07C51/377; B; B01; B01J; B01J21/00; B01J21/06; B01J21/08; B01J23/00; B01J23/38; B01J23/40; B01J23/44; B01J35/00; B01J35/30; B01J35/391; B01J35/392; B01J35/60; B01J35/61; B01J35/615; B01J35/63; B01J35/638; B01J35/66
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
166 words
IN THE PROCESS FOR THE MANUFACTURE OF A CATALYST COMPRISED OF A FINE-PARTICULATE CARRIER AND PALLADIUM METAL FOR THE PARTIAL DEHALOGENATION OF DI- AND/OR TRICHLORACETIC ACIDS, IN THE PRESENCE OF HYDROGEN TO PRODUCE MONOCHLOROACETIC ACID, WHEREIN THE DRY POROUS CARRIER IS IMPREGNATED WITH A PALLADIUM SALT SOLUTION AND THE PALLADIUM ABSORBED BY THE CARRIER IS REDUCED TO PALLADIUM METAL WITH THE USE OF A SUITABLE REDUCING AGENT, THE IMPROVEMENT COMPRISING CONCENTRATING THE PALLADIUM METAL EXCLUSIVELY ON THE SURFACE OF A SILICIC ACID OR ACTIVE CARBON CARRIER HAVING A BET-SURFACE AREA BETWEEN ABOUT 10 AND 800 SQUARE METERS/GRAM AND A MEAN PARTICLE SIZE BETWEEN ABOUT 10 AND 800 MICRONS BY IMPREGNATING ANCLE SIZE BETWEEN ABOUT 10 AND 800 MICRONS BY IMPREGNATING AND PARTIALLY SATURATING THE DRY, FINE-PARTICULATE CARRIER WITH WATER; BY CONTINUING IMPREGNATION UNTIL COMPLETE SATURATION OF THE CARRIER SO PRETREATED WITH THE NECESSARY QUANTITY OF AN AQUEOUS PALLADIUM SALT SOLUTION: AN BY REDUCING THE PALLA DIUM SALT APPLIED TO THE CARRIER TO PALLADIUM IN KNOWN MANNER.
Claim 2
Dependent Claim
166 words
IN THE PROCESS FOR THE MANUFACTURE OF A CATALYST COMPRISED OF A FINE-PARTICULATE CARRIER AND PALLADIUM METAL FOR THE PARTIAL DEHALOGENATION OF DI- AND/OR TRICHLORACETIC ACIDS, IN THE PRESENCE OF HYDROGEN TO PRODUCE MONOCHLOROACETIC ACID, WHEREIN THE DRY POROUS CARRIER IS IMPREGNATED WITH A PALLADIUM SALT SOLUTION AND THE PALLADIUM ABSORBED BY THE CARRIER IS REDUCED TO PALLADIUM METAL WITH THE USE OF A SUITABLE REDUCING AGENT, THE IMPROVEMENT COMPRISING CONCENTRATING THE PALLADIUM METAL EXCLUSIVELY ON THE SURFACE OF A SILICIC ACID OR ACTIVE CARBON CARRIER HAVING A BET-SURFACE AREA BETWEEN ABOUT 10 AND 800 SQUARE METERS/GRAM AND A MEAN PARTICLE SIZE BETWEEN ABOUT 10 AND 800 MICRONS BY IMPREGNATING ANCLE SIZE BETWEEN ABOUT 10 AND 800 MICRONS BY IMPREGNATING AND PARTIALLY SATURATING THE DRY, FINE-PARTICULATE CARRIER WITH WATER; BY CONTINUING IMPREGNATION UNTIL COMPLETE SATURATION OF THE CARRIER SO PRETREATED WITH THE NECESSARY QUANTITY OF AN AQUEOUS PALLADIUM SALT SOLUTION: AN BY REDUCING THE PALLA DIUM SALT APPLIED TO THE CARRIER TO PALLADIUM IN KNOWN MANNER.
Claim 3
Dependent Claim
20 words
The process as claimed in claim 1, wherein the carrier has a BET-surface area between 100 and 500 square meters/gram.
Claim 4
Dependent Claim
20 words
The process as claimed in claim 1, wherein the carrier has a volume of pores between 0.8 and 1.2 milliliters/gram.
Claim 5
Dependent Claim
17 words
The process as claimed in claim 1, wherein the palladium salt is palladium chloride or palladium acetate.
Claim 6
Dependent Claim
28 words
The process as claimed in claim 1, wherein the carrier is treated with the pure solvent and saturated therewith to a degree between about 50 and 80 percent.
Claim 7
Dependent Claim
23 words
The process as claimed in claim 1, wherein between about 0.1 and 10 weight percent of palladium is deposited on the carrier material.
Claim 8
Dependent Claim
21 words
The process as claimed in claim 10, wherein between 0.2 and 1 weight percent of palladium is deposited on the carrier.
Claim 9
Dependent Claim
19 words
The process as claimed in claim 1, wherein the carrier has a mean particle size of about 100 microns.
References Cited (Backward Citations)
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US2823235A
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US2917546A
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US3641121A
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US3736266A
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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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |