GB972833A - Hardened molecular sieve agglomerates and manufacture thereof - Google Patents
Hardened molecular sieve agglomerates and manufacture thereofInfo
- Publication number
- GB972833A GB972833A GB4097561A GB4097561A GB972833A GB 972833 A GB972833 A GB 972833A GB 4097561 A GB4097561 A GB 4097561A GB 4097561 A GB4097561 A GB 4097561A GB 972833 A GB972833 A GB 972833A
- Authority
- GB
- United Kingdom
- Prior art keywords
- agglomerates
- silicate
- clay
- hours
- fired
- 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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/16—Alumino-silicates
- B01J20/18—Synthetic zeolitic molecular sieves
- B01J20/183—Physical conditioning without chemical treatment, e.g. drying, granulating, coating, irradiation
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
An agglomerate formed of a zeolitic molecular sieve and a clay mineral binder is hardened by impregnating in the hydrated state with an aqueous solution of an alkali metal silicate having a solid content of 3-35% by weight, and firing the impregnated agglomerate at at least 343 DEG C. but below the temperature at which the crystalline zeolotic molecular sieve loses its structural stability. The sieve may be zeolite A, T, X, or Y, or the natural minerals erionite, chabazite, analcite, faujasite, clinoptilolite, or mordenite, and the silicate may be sodium, lithium, potassium, rubidium or caesium silicate. In the case of sodium zeolite A used for removing moisture from a refrigerant fluid such as di-fluoromonochloromethane, the adsorptive capacity of the sieve for the fluid is reduced to substantially zero while the absorptive capacity for water is retained. The clay may be attapulgite, kaolin, sepiolite, polygarskite, kaolinite, a plastic ball clay, bentonite, montmorillonite, illite, chlorite, or an attapulgite-, kaolin-, or bentonite-type clay. The weight ratio of alkali metal oxide: SiO2 in the silicate solution may be 0.27-0.63: 1, while the weight ratio (on a substantially water-free basis) of zeolite: clay in the agglomerate may be 9: 1 to 3: 1. The agglomerate is preferably in its unfired form, but, if not, it should be restored to a fully hydrated state before impregnation. The agglomerates may be soaked in the silicate solution either in batch or continuous operation, and the soaking may be hot or cold, temperatures below 60 DEG C. being preferred. The immersion time may vary from a few minutes to several days according to conditions, longer times effecting a deeper hardening. Immersion may be followed by a brief rinse to remove surface solution to prevent adhesion of the agglomerates. The agglomerates may be fired immediately or given a preliminary drying to reduce the moisture content to 15-22% by weight. Already-fired agglomerates require a temperature of at least 343 DEG C. to set the silicate, while impregnated unfired agglomerates require firing in the range 565-660 DEG C. In a comparative procedure, fully wet 1/8 inch diameter agglomerates of 80 parts by weight sodium zeolite A and 20 parts by weight of attapulgus clay are allowed to dry in air for 24 hours, and are then dried at 100 DEG C. for 3 hours, and are fired at 625 DEG C. for 15 minutes in a forced air purge. In Example I, the wet agglomerates of the comparative procedure are soaked in a sodium silicate solution for 16 hours, drained, rinsed with warm water, and are dried and fired. In Example II, the fired product of the comparative procedure is rehydrated in a steam-heated oven, soaked in a sodium silicate solution for 7 hours, and further treated as in Example I. Example III is similar to Example II, except that the rehydration is effected in air for 48 hours and in water for 2 minutes. In Example IV, a potassium silicate solution is used. A table shows the crushing strength of a number of agglomerates subjected to differing treatments. Specifications 777,232, 777,233, 909,266, 912,936 and 972,831 are referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US7140160A | 1960-11-25 | 1960-11-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB972833A true GB972833A (en) | 1964-10-21 |
Family
ID=22101062
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4097561A Expired GB972833A (en) | 1960-11-25 | 1961-11-16 | Hardened molecular sieve agglomerates and manufacture thereof |
Country Status (2)
Country | Link |
---|---|
DE (3) | DE1179918B (en) |
GB (1) | GB972833A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0053004A2 (en) * | 1980-11-21 | 1982-06-02 | The British Petroleum Company p.l.c. | Improvements relating to the production of zeolite agglomerates |
GB2160517A (en) * | 1984-06-18 | 1985-12-24 | Inst Francais Du Petrole | Synthetic zeolites |
US5026531A (en) * | 1989-02-10 | 1991-06-25 | Uop | Silicate treatment of molecular sieve agglomerates |
US5045295A (en) * | 1989-02-10 | 1991-09-03 | Uop | Silicate treatment of molecular sieve agglomerates |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3132379A1 (en) * | 1981-08-17 | 1983-02-24 | Degussa Ag, 6000 Frankfurt | ZEOLITE GRANULES, METHOD FOR THE PRODUCTION AND USE THEREOF |
FR2648727B1 (en) * | 1989-06-21 | 1994-09-02 | Toa Gosei Chem Ind | GRAIN MINERAL ION EXCHANGER |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE602629C (en) * | 1930-06-21 | 1934-09-12 | Ch V Kobelt Dr | Manufacture of base-exchanging substances |
DE1040005B (en) * | 1955-07-01 | 1958-10-02 | Union Carbide Corp | Process for making bound molecular sieves |
-
1961
- 1961-10-04 DE DEU8376A patent/DE1179918B/en active Pending
- 1961-11-16 GB GB4097561A patent/GB972833A/en not_active Expired
- 1961-11-24 DE DEU8488A patent/DE1186448B/en active Pending
- 1961-11-24 DE DE19611567856 patent/DE1567856A1/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0053004A2 (en) * | 1980-11-21 | 1982-06-02 | The British Petroleum Company p.l.c. | Improvements relating to the production of zeolite agglomerates |
EP0053004A3 (en) * | 1980-11-21 | 1982-08-11 | The British Petroleum Company P.L.C. | Improvements relating to the production of zeolite agglomerates |
US4405503A (en) | 1980-11-21 | 1983-09-20 | The British Petroleum Company Limited | Production of zeolite agglomerates |
GB2160517A (en) * | 1984-06-18 | 1985-12-24 | Inst Francais Du Petrole | Synthetic zeolites |
US5026531A (en) * | 1989-02-10 | 1991-06-25 | Uop | Silicate treatment of molecular sieve agglomerates |
US5045295A (en) * | 1989-02-10 | 1991-09-03 | Uop | Silicate treatment of molecular sieve agglomerates |
Also Published As
Publication number | Publication date |
---|---|
DE1186448B (en) | 1965-02-04 |
DE1179918B (en) | 1964-10-22 |
DE1567856A1 (en) | 1970-10-22 |
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