Process for preparing crystalline zeolite composition ERC-2
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IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C01B-033/28
출원번호
US-0550897
(1983-11-10)
발명자
/ 주소
Vaughan, David E.
출원인 / 주소
Exxon Research and Engineering Co.
대리인 / 주소
Wheelock, E. Thomas
인용정보
피인용 횟수 :
13인용 특허 :
5
초록▼
A synthetic crystalline zeolite is provided characterized by having a composition, in terms of mole ratios of oxides, in the range: 0.9 to 1.1 M 2/n O:Al 2 O 3 :2.5 to 5.1 SiO 2 :xH 2 O wherein M is at least one exchangeable cation, n is the valence of M, and x is 0 to 6, and characterized by hav
A synthetic crystalline zeolite is provided characterized by having a composition, in terms of mole ratios of oxides, in the range: 0.9 to 1.1 M 2/n O:Al 2 O 3 :2.5 to 5.1 SiO 2 :xH 2 O wherein M is at least one exchangeable cation, n is the valence of M, and x is 0 to 6, and characterized by having a specified X-ray powder diffraction pattern. The zeolite may be prepared by crystallization from a reaction mixture of KOH (and optionally a minor amount of NaOH), water, a source of silica, and a source of alumina preferably derived from kaolin or halloysite. Most preferably, the source of alumina is metakaolin and the source of silica is potassium silicate.
대표청구항▼
1. A process for preparing a crystalline zeolite having a composition, in terms of mole ratios of oxides, in the range: ##EQU##0.9 to 1.1 M 2 O:Al 2 O 3 :2.5 to 5.1 SiO 2 :0 to 6 H 2 O where M is K or a mixture of K and Na, where Na is no more than 30 mole percent of the mixture, and characterized
1. A process for preparing a crystalline zeolite having a composition, in terms of mole ratios of oxides, in the range: ##EQU##0.9 to 1.1 M 2 O:Al 2 O 3 :2.5 to 5.1 SiO 2 :0 to 6 H 2 O where M is K or a mixture of K and Na, where Na is no more than 30 mole percent of the mixture, and characterized by having an X-ray powder diffraction pattern essentially identical to that given in Table IV which is characteristic of zeolite L, which comprises: (a) preparing a reaction mixture comprising water, a source of silica, metakaolin, KOH and up to about 30 mole percent of NaOH based on total moles of KOH and NaOH, said reaction mixture having a composition, in terms of mole ratios of oxides, within the following ranges: [TABLE] ______________________________________ M' 2 O:Al 2 O 3 1.0 to 1.6 SiO 2 :Al 2 O 3 2.5 to 5.1 H 2 O:Al 2 O 3 80 to 140 ______________________________________ where M' is either K or a mixture of K and Na; and (b) maintaining the reaction mixture at between about 140° and 300° C. under autogeneous pressure for a sufficient period of time so as to form crystals of the zeolite. 2. The process of claim 1 where NaOH is not employed in the reaction mixture. 3. The process of claim 1 wherein after step (a) but before step (b) the reaction mixture is blended sufficiently to form a substantially homogeneous mixture. 4. The process of claim 1 wherein during step (b) the reaction mixture is stirred at a rate less than 60 rpm to maintain substantial homogeneity thereof. 5. The process of claim 1 wherein the composition of then reaction mixture in step (a) is adjusted to produce a crystalline zeolite product having a composition in the range: ##EQU##0.9 to 1.1 K 2 O:Al 2 O 3 :2.8 to 4.8 SiO 2 . 6. The process of claim 1 wherein the source of silica is potassium silicate. 7. The process of claim 1 wherein the reaction mixture is maintained between 160° and 240° C. 8. The process of claim 7 wherein the reaction mixture is maintained between said temperatures for 2-8 days. 9. The process of claim 1 wherein prior to step (b) microcrystals of a zeolite are added to the blended reaction mixture in an amount of from 0.1 to 10% by weight based on silica and alumina. 10. The process of claim 1 wherein prior to step (b) at least a portion of the blended reaction mixture is maintained at about 10° to 100° C. for about 6 hours to 6 days. 11. A process for preparing a crystalline zeolite having a composition, in terms of mole ratios of oxides, in the range: ##EQU##0.9 to 1.1K 2 O:Al 2 O 3 :2.8 to 4.8SiO 2 and having atoms arranged in a hexagonal unit cell such that the X-ray powder diffraction pattern of said zeolite is essentially identical to that given in Table IV, which comprises: (a) preparing a reaction mixture comprising KOH, water, potassium silicate and metakaolin, said reaction mixture having a composition, in terms of mole ratios of oxides, within the following ranges: [TABLE] ______________________________________ K 2 O:Al 2 O 3 1.0 to 1.6 SiO 2 :Al 2 O 3 3 to 5 H 2 O:Al 2 O 3 90 to 120 ______________________________________ (b) blending the reaction mixture sufficiently to form a substantially homogeneous mixture; and (c) maintaining the blended reaction mixture at between 160° and 240° C. under autogenous pressure for a sufficient period of time to form crystals of the zeolite.
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이 특허에 인용된 특허 (5)
Bernard Jean-Rene (Serezin du Rhone FRX) Breysse Michele (Villeurbanne FRX), Catalyst for production of aromatic hydrocarbons and process for preparation.
Fajula Francois (Teyran FRX) Figueras Francois (Montpellier FRX) Moudafi Latifa (Djemaa Casablanca MAX) Vera Pacheco Mercedes (Mexico City MXX) Nicolas Serge (Montpellier FRX) Dufresne Pierre (Rueil , Omega type zeolite having high thermal stability, its process of preparation and its utilization.
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