Patent DE913092C successfully refreshed from Google Patents.
Patent US6148010A successfully refreshed from Google Patents.
Patent US3870656A successfully refreshed from Google Patents.
US3870656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of silica-containing compositions
Assignee: Phillips Petroleum Co
•
Filing: 1972-05-25
•
Granted: 1975-03-11
•
Expires: 1992-05-25
Abstract
Abstract A method of preparing a silica-containing composition in which a hydrogel is formed and washed, and the water is separated from the hydrogel employing an organic compound and azeotropic distillation. Procedures for controlling the hydrogel washing and azeotropic distillation are disclosed.
Inventors
- 👤 Terry D Brown
- 👤 Joseph A Delap
- 👤 Jr Benny E Nasser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:49
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/157; C01B33/158; B; B01; B01J; B01J21/00; B01J21/06; B01J21/08; C01B33/16
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
109 words
A METHOD OF PREPARING A SILICA-CONTAINING COMPOSITION WHICH COMPRISES: A. FORMING A HYDROGEL COMPRISING SILICA; B. CONTACTING SAID HYDROGEL WITH AN ORGANIC COMPOUND TO FORM A COMPOSITE COMPRISING SILICA AND A AZEOTROPIC MIXTURE OF WATER AND SAID ORGANIC COMPOUND; C. DISTILLING SAID COMPOSITE IN A DISTALLATION ZONE TO PRODUCE AN OVERHEAD STREAM COMPRISING SAID ORGANIC COMPOUND AND WATER AND TO PRODUCE A XEROGEL; D. PASSING SAID OVERHEAD STREAM INTO CONTACT WITH A COALESCING MATERIAL TO SEPARATE WATER FROM SAID ORGANIC COMPOUND; E. PASSING SAID ORGANIC COMPOUND FROM CONTACT WITH SAID COALESCING MATERIAL TO SAID DISTALLATION ZONE; AND F. RECOVERING SAID XEROGEL FROM SAID DISTALLATION ZONE AS SAID SILICA-CONTAINING COMPOSITION.
Claim 2
Independent Claim
109 words
A METHOD OF PREPARING A SILICA-CONTAINING COMPOSITION WHICH COMPRISES: A. FORMING A HYDROGEL COMPRISING SILICA; B. CONTACTING SAID HYDROGEL WITH AN ORGANIC COMPOUND TO FORM A COMPOSITE COMPRISING SILICA AND A AZEOTROPIC MIXTURE OF WATER AND SAID ORGANIC COMPOUND; C. DISTILLING SAID COMPOSITE IN A DISTALLATION ZONE TO PRODUCE AN OVERHEAD STREAM COMPRISING SAID ORGANIC COMPOUND AND WATER AND TO PRODUCE A XEROGEL; D. PASSING SAID OVERHEAD STREAM INTO CONTACT WITH A COALESCING MATERIAL TO SEPARATE WATER FROM SAID ORGANIC COMPOUND; E. PASSING SAID ORGANIC COMPOUND FROM CONTACT WITH SAID COALESCING MATERIAL TO SAID DISTALLATION ZONE; AND F. RECOVERING SAID XEROGEL FROM SAID DISTALLATION ZONE AS SAID SILICA-CONTAINING COMPOSITION.
Claim 3
Independent Claim
109 words
A method of preparing a silica-containing composition which comprises: a. forming a hydrogel comprising silica; b. contacting said hydrogel with an organic compound to form a composite comprising silica and an azeotropic mixture of water and said organic compound; c. distilling said composite in a distillation zone to produce an overhead stream comprising said organic compound and water and to produce a xerogel; d. passing said overhead stream into contact with a coalescing material to separate water from said organic compound; e. passing said organic compound from contact with said coalescing material to said distillation zone; and, f. recovering said xerogel from said distillation zone as said silica-containing compositIon.
Claim 4
Independent Claim
109 words
A method of preparing a silica-containing composition which comprises: a. forming a hydrogel comprising silica; b. contacting said hydrogel with an organic compound to form a composite comprising silica and an azeotropic mixture of water and said organic compound; c. distilling said composite in a distillation zone to produce an overhead stream comprising said organic compound and water and to produce a xerogel; d. passing said overhead stream into contact with a coalescing material to separate water from said organic compound; e. passing said organic compound from contact with said coalescing material to said distillation zone; and, f. recovering said xerogel from said distillation zone as said silica-containing compositIon.
Claim 5
Dependent Claim
45 words
The method of claim 1 in which said hydrogel is formed by introducing an alkali metal silicate into an acid, and said hydrogel is washed to produce a wash water containing an alkali metal and the alkali metal content of said wash water is measured.
Claim 6
Dependent Claim
21 words
The method of claim 2 in which a chromium-containing compound is contained in said acid or in said alkali metal silicate.
Claim 7
Dependent Claim
21 words
The method of claim 2 in which a titanium-containing compound is contained in said acid or in said alkali metal silicate.
Claim 8
Dependent Claim
15 words
The method of claim 1 in which a chromium-containing compound is introduced into said hydrogel.
Claim 9
Dependent Claim
24 words
The method of claim 1 in which organic compound is introduced into said distillation zone at a first locus and at a second locus.
Claim 10
Dependent Claim
43 words
The method of claim 6 in which the introduction of said organic compound into said distillation zone is discontinued and said organic compound is removed from said distillation zone in the absence of the introduction of said organic compound into said distillation zone.
Claim 11
Dependent Claim
29 words
The method of claim 2 in which the alkali metal content of said hydrogel is reduced to a concentration less than about 0.1 weight percent prior to said distillation.
Claim 12
Dependent Claim
37 words
The method of claim 6 in which said organic compound is passed into said distillation zone until the water content within said distillation zone is within the range of from about 3 to about 3.5 weight percent.
References Cited (Backward Citations)
US3622521A
Cited
US3652216A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |