GB761712A - Silica-alumina compositions and process for the preparation thereof - Google Patents
Silica-alumina compositions and process for the preparation thereofInfo
- Publication number
- GB761712A GB761712A GB22469/54A GB2246954A GB761712A GB 761712 A GB761712 A GB 761712A GB 22469/54 A GB22469/54 A GB 22469/54A GB 2246954 A GB2246954 A GB 2246954A GB 761712 A GB761712 A GB 761712A
- Authority
- GB
- United Kingdom
- Prior art keywords
- alumina
- per cent
- sodium
- precipitate
- salt
- 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
- B01J21/12—Silica and alumina
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G11/00—Catalytic cracking, in the absence of hydrogen, of hydrocarbon oils
- C10G11/02—Catalytic cracking, in the absence of hydrogen, of hydrocarbon oils characterised by the catalyst used
- C10G11/04—Oxides
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Catalysts (AREA)
Abstract
A silica-alumina composition suitable for use in catalysis is prepared by adding an acid (e.g. sulphuric or hydrochloric) to an aqueous alkali metal silicate (sodium or potassium ortho- or meta-silicate), adding an aqueous salt containing aluminium in the cation (e.g. aluminium chloride or sulphate) to the so-formed slurry to precipitate hydrous alumina, adding an aqueous salt containing aluminium in the anion (e.g. sodium or calcium aluminate), to precipitate a further quanitity of hydrous alumina, and recovering the solid product. By filtering the final slurry and reslurrying or removing water from the final slurry, in either case to give a total solids content by weight of 8 per cent and spray-drying, microspheres of clear, glasslike structure are obtained which may be washed and dried for use in fluidized catalytic processes. The compositions may be used alone or in association with oxides of other elements e.g. magnesium, zirconium, titanium, thorium, chromium and/or boron. In comparative tests, the catalyst was steamed prior to use in a cracking process by dripping water upon it while a pressure of 40 lbs. per sq. inch gauge and a temperature of 1200 DEG F. were maintained. The following specific details are given : (a) in the initial step the concentration of acid should be sufficiently low to prevent local reaction and heat generation; 25 to 35 per cent H2SO4 is suitable, and agitation is desirable especially with concentrations greater than this: (b) whilst the acidification of silicate can be completed at as low a pH as 5, it is preferably retained above 7, e.g. 8 to 10.5 (c) the quantity of salt having aluminium in the cation should be such as to render the mixture acid and precipitate alumina, e.g. by lowering the pH to below 2: (d) in examples, the sodium aluminate solution contains also sodium hydroxide and in some, sodium carbonate; the ratio water to salt in the aqueous solution of the salt containing aluminium in the anion is preferably at least 7.5 to 1, better 15 to 1 (as Na2Al2O4): (e) the quantity of said salt to be added may be only such as to precipitate alumina in acid medium e.g. at a pH of 5 to 5.5: (f) the temperature of the reaction mixture is preferably 40 to 140 DEG F.; if precipitation is performed in the cold, it is desirable to heat to 100 to 190 DEG F. preferably 110 to 150 DEG F. before filtration: (g) the slurry is preferably dried by passing a spray in the same direction as a hot gas at 200 to 1000 DEG F. to give a particle temperature of 150 to 300 DEG F., preferably 150 - 230 DEG F.: (h) the catalysts may contain 5 to 45 per cent by weight of alumina on a dry basis, and catalysts containing 13 per cent and 20 to 40 per cent of alumina, the latter of which are particularly stable to steam, are referred to: (i) the preferred particle size is 20 to 100 microns. Examples are also given.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US761712XA | 1954-06-07 | 1954-06-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB761712A true GB761712A (en) | 1956-11-21 |
Family
ID=22130377
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB22469/54A Expired GB761712A (en) | 1954-06-07 | 1954-08-03 | Silica-alumina compositions and process for the preparation thereof |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB761712A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109923061A (en) * | 2016-09-08 | 2019-06-21 | 瑞来斯实业公司 | A kind of stably catalyzed agent prescription of hydrothermal solution and its preparation process |
-
1954
- 1954-08-03 GB GB22469/54A patent/GB761712A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109923061A (en) * | 2016-09-08 | 2019-06-21 | 瑞来斯实业公司 | A kind of stably catalyzed agent prescription of hydrothermal solution and its preparation process |
CN109923061B (en) * | 2016-09-08 | 2022-07-01 | 瑞来斯实业公司 | Hydrothermal stable catalyst formula and preparation process thereof |
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