US3875282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of high bulk density spray dried hydrous sodium silicate
Assignee: Unilever Patent Holdings BV
•
Filing: 1973-04-30
•
Granted: 1975-04-01
•
Expires: 1993-04-30
Abstract
Abstract The invention is a process for preparing high bulk density spray dried hydrous sodium silicate which comprises providing a spray dried hydrous sodium silicate having from about 13 to about 25% water, compacting the spray dried hydrous sodium silicate by the application of mechanical force to cause the particles to adhere and form articles of a higher density. The high density articles can be broken up or granulated and sized to form a material having a bulk density and particle size in the desired range.
Inventors
- 👤 Joseph S Steinreich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:07
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/32; C01B33/325
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
73 words
A METHOD OF INCREASING THE BULK DENSITY AND PARTICLE SIZE OF SPRAY DRIED PARTICLES OF HYDROUS SODIUM SILICATE CONSISTING ESSENTIALLY OF SMALL HOLLOW SPHERES HAVING A GLASSY OUTER SURFACE, COMPRISING: APPLYING MECHANICAL PRESSURE TO SAID SPHERICAL PARTICLES HAVING A WATER CONTENT OF ABOUT 13-25% BY WEIGHT AND A SIO2:NA2O WEIGHT RATIO OF ABOUT 0.8:1 TO 4.0:1 TO FROM SAID SPHERICAL PARTICLES INTO COMPACTED ARTICLES OF LARGER SIZE AND HAVING AN INCREASED BULK DENSITY.
Claim 2
Independent Claim
73 words
A METHOD OF INCREASING THE BULK DENSITY AND PARTICLE SIZE OF SPRAY DRIED PARTICLES OF HYDROUS SODIUM SILICATE CONSISTING ESSENTIALLY OF SMALL HOLLOW SPHERES HAVING A GLASSY OUTER SURFACE, COMPRISING: APPLYING MECHANICAL PRESSURE TO SAID SPHERICAL PARTICLES HAVING A WATER CONTENT OF ABOUT 13-25% BY WEIGHT AND A SIO2:NA2O WEIGHT RATIO OF ABOUT 0.8:1 TO 4.0:1 TO FROM SAID SPHERICAL PARTICLES INTO COMPACTED ARTICLES OF LARGER SIZE AND HAVING AN INCREASED BULK DENSITY.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein at least a portion of the compacted articles are crushed after compacting.
Claim 4
Dependent Claim
26 words
The process of claim 1 wherein at least a portion of the compacted articles are crushed and then separated into at least two particle size ranges.
Claim 5
Dependent Claim
16 words
The process of claim 1 wherein the SiO2:Na2O ratio is from about 1.6:1 to about 3.0:1.
Claim 6
Dependent Claim
25 words
The process of claim 1 wherein the spray dried hydrous sodium silicate has a moisture content of from about 15 to 22 percent by weight.
Claim 7
Dependent Claim
31 words
The process of claim 1 wherein the mechanical pressure is applied to the spray dried hydrous sodium silicate by passing the hydrous sodium silicate between the nip of opposed rotating rolls.
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein the articles are formed by briquetting.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |