Crystalline zeolite HP
AssigneeTexaco Inc.
InventorJohn H. Estes
Life of this patent
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Abstract
A novel crystalline zeolite composition is prepared by conducting the hydrothermal crystallization and, preferably, a preliminary aging step, at high pressure, i.e. pressures in excess of 20,000 psig (ca 138 MPa) and preferably above about 40,000 psig (ca 276 MPa megaPascals). The crystalline zeolite, designated zeolite HP, has a higher aluminum content than zeolite X and a lattice constant of above about 25.02 A.
Claims33
The process for preparing sodium zeolite HP which comprises:
- a. forming an aqueous mixture of sodium aluminosilicate having a composition sufficient to establish a ratio of silicon atoms to aluminum atoms of between about 0.25 and about 1.0;
- b. maintaining said aqueous mixture at hydrothermal conditions including a pressure above 20,000 psig (ca. 138 MPa) and a temperature of 150.degree.-350.degree. F. (65.6.degree.-176.7.degree. C.) for at least three hours;
- and
- c. recovering crystalline zeolite comprising sodium zeolite HP as the resulting solid product.
The process for preparing sodium zeolite HP which comprises:
- a. forming an aqueous mixture of sodium aluminosilicate having a composition sufficient to establish a ratio of silicon atoms to aluminum atoms of between about 0.25 and about 1.0;
- b. aging said aqueous mixture at aging conditions including a time of at least 8 hours at a pressure of 20,000-80,000 psig (ca 138-ca 552 MPa) and a temperature not above 100.degree. F. (37.8.degree. C.) thereby forming an aged aqueous mixture;
- c. maintaining said aged aqueous mixture at hydrothermal conditions including pressure of 20,000-80,000 psig (ca 138-ca 552 MPa) and a temperature of 150.degree.-350.degree. F. (55.6.degree.-176.7.degree. C.) for 4-24 hours thereby forming crystalline zeolite comprising sodium zeolite HP;
- and
- d. recovering said crystalline zeolite comprising sodium zeolite HP.
The process for preparing sodium zeolite HP which comprises:
- a. forming an aqueous mixture of sodium aluminosilicate having a composition sufficient to establish a ratio of silicon atoms to aluminum atoms of between about 0.25 and about 1.0;
- b. maintaining said aqueous mixture at a pressure above 40,000 psig (ca. 276 MPa) and a temperature of 150.degree.-350.degree. F. (65.6.degree.-176.7.degree. C.) for at least three hours thereby forming crystalline zeolite comprising sodium zeolite HP;
- and
- c. recovering said crystalline zeolite comprising sodium zeolite HP.
The process for preparing sodium zeolite HP which comprises
- (a) forming an aqueous mixture of sodium aluminosilicate having a composition sufficient to establish a ratio of silica atoms to aluminum atoms of between about 0.25 and about 1.0;
- (b) aging said aqueous mixture at aging conditions including a time of at least 8 hours at a pressure of 40,000-50,000 psig (ca. 276 MPa-ca 345 MPa) and a temperature not above 100.degree. F. (37.8.degree. C.) thereby forming an aged aqueous mixture;
- (c) maintaining said aged aqueous mixture at hydrothermal conditions including pressure of 40,000-50,000 psig (ca. 276 MPa-ca. 345 MPa) and a temperature of 150.degree. F.-350.degree. F. (55.6.degree.-176.7.degree. C.) for 4-24 hours thereby forming crystalline zeolite comprising sodium zeolite HP;
- and
- recovering said crystalline zeolite comprising sodium zeolite HP.
A synthetic crystalline sodium aluminosilicate zeolite, having a lattice constant of about 25.01 A -25.0 A.
A synthetic crystalline sodium aluminosilicate zeolite having lattice constant between about 25.02 and 25.10 A and an atom ratio of silicon to aluminum in the unit cell of below 1.00.
A synthetic crystalline sodium aluminosilicate zeolite characterized by a lattice constant of about 25.02-25.10 A, (ii) an atom ratio of Si to Al in the unit cell below 1.0, and (iii) substantially 100% ion exchange capacity for NH.sub.4.sup.+ ions.
A synthetic crystalline sodium aluminosilicate zeolite, having a lattice constant of about 25.02 A-25.10 A prepared by the process which comprises
- (a) forming an aqueous mixture of sodium aluminosilicate having a composition sufficient to establish a ratio of silicon atoms to aluminum atoms of between about 0.25 and about 1.0;
- (b) maintaining said aqueous mixture at hydrothermal conditions including a pressure above 20,000 psig (ca. 138 MPa) and a temperature of 150.degree.-350.degree. F. (65.6.degree.-176.7.degree. C.) for at least three hours;
- and
- (c) recovering crystalline zeolite comprising said sodium zeolite as the resulting solid product.
A synthetic crystalline sodium aluminosilicate zeolite, having a lattice constant of about 25.02 A-25.10 A prepared by the process which comprises;
- (a) forming an aqueous mixture of sodium aluminosilicate having a composition sufficient to establish a ratio of silicon atoms to aluminum atoms of between about 0.25 and about 1.0;
- (b) maintaining said aqueous mixture at a pressure above 40,000 psig (ca. 276 MPa) and a temperature of 150.degree.-350.degree. F. (65.6.degree.-176.7.degree. C.) for at least three hours;
- and
- (c) recovering said sodium zeolite as the resulting solid product.
Dependencies are inferred from the claim text.