Patent US3629951A successfully refreshed from Google Patents.
US3629951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilevel spray-drying method
Assignee: Procter and Gamble Co
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Filing: 1970-07-31
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Granted: 1971-12-28
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Expires: 1990-07-31
Abstract
Abstract A method is provided for spray-drying large volumes of a synthetic detergent slurry which comprises spraying the slurry into the spray-drying chamber in at least two different levels of uniformly spaced atomizing nozzles. The lowest level of nozzles is critically positioned at a point in the spray chamber below a 190* F. isotherm and above a boiling point isotherm. From 30 to 80 percent of the slurry is atomized at this lowest level. The balance of the same slurry is sprayed through the remaining levels. Apparatus is provided for practicing this process.
Inventors
- 👤 Robert P Davis
- 👤 Michael S Haines
- 👤 John A Sagel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:20
CPC Classifications
C; C11; C11D; C11D11/00; C11D11/02; B; B01; B01D; B01D1/00; B01D1/16; B01D1/18; Y; Y10; Y10S; Y10S159/00; Y10S159/14
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
28 words
A method according to claim 1 wherein in step 3 the amount sprayed is in the range of from 35 to 70 percent of said synthetic detergent slurry.
Claim 2
Dependent Claim
52 words
establishing within the chamber of the spray tower (a) a cylindrically shaped drying zone with the axis of the chamber by passing heated drying air upwards through the chamber in a cyclonic motion and (b) a low-pressure zone comprising a concentric vortex tube which is formed along the axis of the chamber;
Claim 3
Dependent Claim
69 words
continuously spraying countercurrently from 30 to 80 percent of said synthetic detergent slurry directly into the cylindrically shaped drying zone at the point below a 190* F. isotherm and above a boiling point isotherm said spraying being achieved with atomizing nozzles substantially uniformly spaced in a horizontal plane through the cylindrical drying zone thereby providing that substantially each of the sprays disintegrates into particles within said cylindrical drying zone;
Claim 4
Dependent Claim
56 words
A method according to claim 1 wherein in step 4 the balance of said synthetic detergent slurry is sprayed into the cylindrically shaped drying zone by means of one level of uniformly spaced atomizing nozzles which are located at a point in the tower where the temperatures in the range of 165* to 185* F. obtain.
Claim 5
Dependent Claim
53 words
A method according to claim 3 wherein there is a third level of uniformly spaced atomizing nozzles located intermediate (a) the level of atomizing nozzles located in the tower where temperatures in the range of 165* to 185* F. obtain and (b) the level of atomizing nozzles located below the 190* F. isotherm.
Claim 6
Dependent Claim
85 words
continuously spraying countercurrently the balance of said synthetic detergent slurry directly into the cylindrically shaped drying zone at a point above the 190* F. isotherm by means of at least one level of atomizing nozzles substantially uniformly spaced in a horizontal plane through the cylindrical drying zone, thereby providing that substantially each of the sprays disintegrates into particles within said cylindrical drying zone, whereby the only disintegrated particles entering the low-pressure vortex tube are those incidentally carried by the cyclonic motion of the drying gas.
Claim 7
Dependent Claim
24 words
A methOd according to claim 3 wherein the intermediate third level of atomizing nozzles is located substantially equidistant between the upper and lower levels.
Claim 8
Dependent Claim
14 words
A method according to claim 1 wherein the detergency builder is a phosphorus-free builder.
Claim 9
Dependent Claim
17 words
A method according to claim 6 wherein the detergency builder is a water-soluble salt of nitrilotriacetic acid.
Claim 10
Dependent Claim
14 words
A method according to claim 1 wherein the detergency builder is phosphorus-free and nitrogen-free.
Claim 11
Dependent Claim
24 words
A method according to claim 8 wherein the detergency builder is selected from a water-soluble salt of citric acid, mellitic acid or mixtures thereof.
Claim 12
Dependent Claim
42 words
A method according to claim 1 wherein the detergent is a nonsoap anionic synthetic detergent and the builder is one having reduced phosphate level comprising a mixture of sodium tripolyphosphate and sodium nitrilotriacetate in a molar ratio respectively of 3:1 to 1:6.
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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |