US4082677A
Expired / Lapsed
US
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Dried phosphoric acid product and process
Assignee: Harvest Industries Inc
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Filing: 1974-02-25
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Granted: 1978-04-04
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Expires: 1994-02-25
Abstract
Abstract A new dry phosphoric acid product and the process for making it are disclosed. The product is a dry finely divided, brown or black, charcoal-like, extremely hygroscopic powder having an effective phosphoric acid content of up to about 122.4% by weight (based on a 75% aqueous solution) a phosphorus content of up to about 29% by weight; and a moisture content usually less than 10% by weight, typically 3 to 8%. The product is useful as a source of phosphoric acid, and in combination, it produces a new animal feed ingredient material, a new drilling mud additive, and other novel products. The process comprises first mixing a phosphoric acid solution, such as 75 or 85% by weight phosphoric acid solutions of commercial grade, with a dry, relatively fine absorbent material, preferably an organic absorbent material such as peanut hulls, rice hulls, beet pulp or other inexpensive organic by-products, and then drying the mixture in conventional drying equipment, preferably at temperatures from 150° to 200° C. When organic absorbent carriers are used, the phosphoric acid and the heat of drying oxidize and dehydrate the organic materials so that the resultant dried product containing the dried phosphoric acid has the powdered, burnt or charcoal-like appearance.
Inventors
- 👤 Leland H. Zollar
- 👤 Edward W. Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:30
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; A; A23; A23K; A23K20/00; A23K20/20; A23K20/26; A23K40/00; A23K40/10; C01; C01B; C01B25/00; C01B25/16; C01B25/18; Y; Y10; Y10S; Y10S426/00; Y10S426/807
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
37 words
A process of producing a dehydrated phosphoric acid compound comprising mixing an aqueous phosphoric acid solution and an absorbent organic carrier, dehydrating the mix, to form a dry, dehydrated phosphoric acid compound, and recovering the dried compound.
Claim 2
Dependent Claim
37 words
A process of producing a dehydrated phosphoric acid compound comprising mixing an aqueous phosphoric acid solution and an absorbent organic carrier, dehydrating the mix, to form a dry, dehydrated phosphoric acid compound, and recovering the dried compound.
Claim 3
Dependent Claim
37 words
The method of claim 1 wherein the mix contains from about 1/10 to 10/1 parts by weight aqueous phosphoric acid solution on a 75% H 3 PO 4 basis, per one part by weight sorbent organic carrier.
Claim 4
Dependent Claim
19 words
The method of claim 1 wherein the mix is dried at a temperature between about 150° to 200° C.
Claim 5
Dependent Claim
43 words
The method of claim 1 wherein the sorbent organic carrier is selected from the group consisting of soybean hulls, peanut hulls, rice hulls, wheat bran, beet pulp, citrus pulp, soybean meal, cottonseed meal, starch, pulverized corn, sugar, molasses, charcoal, sawdust and wood shavings.
Claim 6
Dependent Claim
21 words
The method of claim 1 wherein the absorbent organic carrier is oxidized to a fine, carbonaceous powder during the drying step.
Claim 7
Dependent Claim
21 words
A dry pulverulent phosphoric acid product having a sorbent, organic carrier and having the phosphoric acid impregnated into the carrier matrix.
Claim 8
Dependent Claim
21 words
A dry pulverulent phosphoric acid product having a sorbent, organic carrier and having the phosphoric acid impregnated into the carrier matrix.
Claim 9
Dependent Claim
31 words
The product of claim 6 wherein the product has a phosphoric acid equivalence of up to about 122.4% by weight based on the weight of a 75% aqueous phosphoric acid solution.
Claim 10
Dependent Claim
19 words
The product of claim 6 wherein the product has a moisture content between about 0 and 10% by weight.
Claim 11
Dependent Claim
19 words
The product of claim 6 wherein the product has a phosphorus content of up to about 29% by weight.
Claim 12
Dependent Claim
17 words
The product of claim 6 wherein the carrier is in the form of an oxidized, carbonaceous matrix.
Claim 13
Dependent Claim
44 words
A process of producing a dehydrated phosphoric acid which is readily rehydratable to orthophosphoric acid by reconstitution with water comprising mixing an aqueous phosphoric acid solution and an absorbent carrier, dehydrating the mix to form a dry phosphoric acid and recovering the dried compound.
Claim 14
Dependent Claim
44 words
A process of producing a dehydrated phosphoric acid which is readily rehydratable to orthophosphoric acid by reconstitution with water comprising mixing an aqueous phosphoric acid solution and an absorbent carrier, dehydrating the mix to form a dry phosphoric acid and recovering the dried compound.
Claim 15
Dependent Claim
14 words
The method of claim 11 wherein the absorbent carrier is an absorbent organic carrier.
Claim 16
Dependent Claim
36 words
The method of claim 11 wherein the mix contains from about 1/10 to 10/1 parts by weight aqueous phosphoric acid solution on a 75% H 3 PO 4 basis, per one part by weight sorbent carrier.
Claim 17
Dependent Claim
19 words
The method of claim 11 wherein the mix is dried at a temperature between about 150° to 200° C.
Claim 18
Dependent Claim
46 words
The method of claim 11 wherein the sorbent carrier is selected from the group of sorbent organic carriers consisting of soybean hulls, peanut hulls, rice hulls, wheat bran, beet pulp, citrus pulp, soybean meal, cottonseed meal, starch, pulverized corn, sugar, molasses, charcoal, sawdust and wood shavings.
Claim 19
Dependent Claim
21 words
The method of claim 15 wherein the sorbent organic carrier is oxidized to a fine, carbonaceous powder during the drying step.
Claim 20
Dependent Claim
19 words
The method of claim 11 wherein the absorbent carrier is selected from the group consisting of clay and talc.
Claim 21
Dependent Claim
23 words
A dry pulverulent phosphoric acid readily reconstitutable in water having a sorbent carrier and having the phosphoric acid impregnated into the carrier matrix.
Claim 22
Dependent Claim
23 words
A dry pulverulent phosphoric acid readily reconstitutable in water having a sorbent carrier and having the phosphoric acid impregnated into the carrier matrix.
Claim 23
Dependent Claim
12 words
The product of claim 18 wherein the carrier is an organic carrier.
Claim 24
Dependent Claim
41 words
The product of claim 19 wherein the carrier is selected from the group consisting of soybean hulls, peanut hulls, rice hulls, wheat bran, beet pulp, citrus pulp, soybean meal, cottonseed meal, starch, pulverized corn, sugar, molasses, charcoal, sawdust and wood shavings.
Claim 25
Dependent Claim
18 words
The product of claim 20 wherein the carrier is selected from the group consisting of clay and talc.
Claim 26
Dependent Claim
31 words
The product of claim 18 wherein the product has a phosphoric acid equivalence of up to about 122.4% by weight based on the weight of a 75% aqueous phosphoric acid solution.
Claim 27
Dependent Claim
19 words
The product of claim 18 wherein the product has a moisture content between about 0 and 10% by weight.
Claim 28
Dependent Claim
19 words
The product of claim 18 wherein the product has a phosphorus content of up to about 29% by weight.
Claim 29
Dependent Claim
17 words
The product of claim 18 wherein the carrier is in the form of an oxidized, carbonaceous matrix.
Claim 30
Dependent Claim
15 words
The product of claim 18 wherein the phosphoric acid is readily reconstitutable or orthophosphoric acid.
Claim 31
Dependent Claim
82 words
A dry pulverulent phosphoric acid product, which can be reconstituted by water to orthophosphoric acid, having an oxidized carbonaceous matrix and dried orthophosphoric acid impregnated therein, the carbonaceous matrix being an oxidized absorbent organic carrier, the product having a moisture content of between about 0 and 10% by weight, a phosphorus content of up to about 29% by weight and an orthophosphoric acid equivalence of up to about 122.4% by weight based on the weight of a 75% aqueous phosphoric acid solution.
Claim 32
Dependent Claim
82 words
A dry pulverulent phosphoric acid product, which can be reconstituted by water to orthophosphoric acid, having an oxidized carbonaceous matrix and dried orthophosphoric acid impregnated therein, the carbonaceous matrix being an oxidized absorbent organic carrier, the product having a moisture content of between about 0 and 10% by weight, a phosphorus content of up to about 29% by weight and an orthophosphoric acid equivalence of up to about 122.4% by weight based on the weight of a 75% aqueous phosphoric acid solution.
Claim 33
Dependent Claim
42 words
The product of claim 27 wherein the organic carrier is selected from the group consisting of soybean hulls, peanut hulls, rice hulls, wheat bran, beet pulp, citrus pulp, soybean meal, cottonseed meal, starch, pulverized corn, sugar, molasses, charcoal, sawdust and wood shavings.
Claim 34
Dependent Claim
96 words
A process of producing a dry pulverulant phosphoric acid product, which can be reconstituted by water to orthophosphoric acid, comprising mixing an aqueous phosphoric acid solution with an adsorbent organic carrier, drying the mix and oxidizing the carrier into a carbonaeous matrix having the dried orthophosphoric acid impregnated therein, the dried product having a moisture content between about 0 and 10% by weight, a phosphorus content of up to about 29% by weight, and an orthophosphoric acid equivalence of up to about 29% by weight based on the weight of a 75% aqueous phosphoric acid solution.
Claim 35
Dependent Claim
96 words
A process of producing a dry pulverulant phosphoric acid product, which can be reconstituted by water to orthophosphoric acid, comprising mixing an aqueous phosphoric acid solution with an adsorbent organic carrier, drying the mix and oxidizing the carrier into a carbonaeous matrix having the dried orthophosphoric acid impregnated therein, the dried product having a moisture content between about 0 and 10% by weight, a phosphorus content of up to about 29% by weight, and an orthophosphoric acid equivalence of up to about 29% by weight based on the weight of a 75% aqueous phosphoric acid solution.
Claim 36
Dependent Claim
42 words
The process of claim 29 wherein the organic carrier is selected from the group consisting of soybean hulls, peanut hulls, rice hulls, wheat bran, beet pulp, citrus pulp, soybean meal, cottonseed meal, starch, pulverized corn, sugar, molasses, charcoal, sawdust and wood shavings.
References Cited (Backward Citations)
US2379100A
Cited
US3048471A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-03 | 1981-10-03 | 1982-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-03 | 1985-10-03 | 1986-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-03 | 1989-10-03 | 1990-04-04 | $7700.00 | Window Closed / Lapsed |