GB814073A - Catalytic oxidation of methanol and catalyst and catalyst precursor therefor - Google Patents
Catalytic oxidation of methanol and catalyst and catalyst precursor thereforInfo
- Publication number
- GB814073A GB814073A GB24129/55A GB2412955A GB814073A GB 814073 A GB814073 A GB 814073A GB 24129/55 A GB24129/55 A GB 24129/55A GB 2412955 A GB2412955 A GB 2412955A GB 814073 A GB814073 A GB 814073A
- Authority
- GB
- United Kingdom
- Prior art keywords
- precipitate
- catalyst
- solution
- molybdate
- methanol
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C47/00—Compounds having —CHO groups
- C07C47/02—Saturated compounds having —CHO groups bound to acyclic carbon atoms or to hydrogen
- C07C47/04—Formaldehyde
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
An inactive catalyst precursor suitable for conversion to an active catalyst for the oxidation of methanol to formaldehyde (see Group IV (b)) is prepared by mixing an aqueous solution of an iron salt with an aqueous solution of a molybdate and partially drying the precipitate; the mixture of solutions should have a pH of 0.5-3.5 and the precipitate a molar ratio of MoO3 to Fe2O3 of 3.3:1 to 11.2:1. The catalyst precursor has good mechanical strength and is stable during storage and transport. Suitable iron salts are ferric chloride, bromide, acetate, and sulphate and ferrous chloride and acetate; suitable molybdates are ammonium, potassium, and sodium molybdates, and molybdates of organic amines. Trace amounts of Al, Ca, Cr, Co, Mg, Ni and Si in the catalyst precursor are not harmful. The molybdate solution should preferably be adjusted to a pH of 2.25 to 5.0 by addition of hydrochloric or hydrobromic acid. After washing and filtering the precipitate is dried, preferably in stages at increasing temperatures up to 300 DEG F. to a water content of 2-30 per cent. In examples: (1) a solution of sodium molybdate, made by dissolving molybdenum trioxide in sodium hydroxide solution, is treated with concentrated hydrochloric acid to a pH of 5 and then added to ferric chloride solution of pH 1.7; the precipitate is washed, filtered and dried; (2) a solution of ammonium molybdate is adjusted to pH 2.25 with hydrochloric acid and is added to ferric chloride solution, the precipitate being treated as in (1). In each example the product is loaded into the tubes of a converter and an active catalyst formed by heating to a temperature of 500 DEG F. in a stream of air, which may be dehydrated, until all water and volatile substances are removed. U.S.A. Specification 1,913,405 is referred to.ALSO:Formaldehyde is prepared by passing methanol and an oxidizing gas through a catalyst formed by heating at 300-495 DEG F. in the presence of air a catalyst precursor which has been produced by mixing an aqueous solution of an iron salt with an aqueous solution of a molybdate and partially drying the precipitate; the mixture of solutions should have a pH of 0.5-3.5 and the precipitate a molar ratio of MoO3 to Fe2O3 of 3.3 : 1 to 11.2 : 1 (see Group III). A mixture of 9 per cent methanol and 91 per cent air may be passed at 480 DEG F. through parallel tubes containing the catalyst. A suitable arrangement of apparatus is shown diagrammatically. U.S.A. Specification 1,913,405 is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US814073XA | 1954-08-27 | 1954-08-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB814073A true GB814073A (en) | 1959-05-27 |
Family
ID=22163956
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB24129/55A Expired GB814073A (en) | 1954-08-27 | 1955-08-22 | Catalytic oxidation of methanol and catalyst and catalyst precursor therefor |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB814073A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0109775A1 (en) * | 1982-10-26 | 1984-05-30 | Nitto Chemical Industry Co., Ltd. | Process for regeneration of iron-antimony metallic oxide catalysts |
-
1955
- 1955-08-22 GB GB24129/55A patent/GB814073A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0109775A1 (en) * | 1982-10-26 | 1984-05-30 | Nitto Chemical Industry Co., Ltd. | Process for regeneration of iron-antimony metallic oxide catalysts |
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