US4599250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Freeze conditioning agent for particulate solids
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1982-11-19
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Granted: 1986-07-08
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Expires: 2002-11-19
Abstract
Abstract A method for treating particulate solids such as coal to reduce the cohesive strength of such solids when frozen which consists of spraying said solids with a hydrocarbon liquid solution of a balanced blend of surfactants which blend will form a single phase microemulsion at 20 DEG C. when added to water at the salinity of the water on said solids at a water to hydrocarbon ratio in the range between 99:1 and 85:15, said blend represented by the monoethanol amine salt of dodecyl o-xylene sulfonic acid and a dinonylphenol reacted with 9 moles of ethylene oxide, onto the wetted surface of said solids to form a single phase microemulsion which is optimally designed to undergo a lipophilic shift upon contacting the surface of said particles whereby an in-situ water-in-oil coarse emulsion is formed on the surfaces of said particles.
Inventors
- 👤 Virgil H. Cargle
- 👤 Max L. Robbins
- 👤 Jan Bock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:09
CPC Classifications
C; C10; C10L; C10L9/00; C10L9/10; C09; C09K; C09K3/00; C09K3/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
126 words
A method for treating particulate solids having surface moisture which comprises the steps of: (a) spraying the particulate solids prior to exposure to a freezing environment with an effective amount of a blend of hydrophile and lipophile surfactants in a liquid hydrocarbon at a concentration of 1 to 50 weight percent which blend has the property of forming a homogenous microemulsion at 20° C. when added to water at the salinity of said surface moisture on the particulate solids to be sprayed and at a water to hydrocarbon ratio in the range between 99:1 and 85:15; and (b) forming a microemulsion by the resulting admixture of said blend and said surface moisture between said solids whereby the cohesive strength of such solids when frozen is reduced.
Claim 2
Independent Claim
126 words
A method for treating particulate solids having surface moisture which comprises the steps of: (a) spraying the particulate solids prior to exposure to a freezing environment with an effective amount of a blend of hydrophile and lipophile surfactants in a liquid hydrocarbon at a concentration of 1 to 50 weight percent which blend has the property of forming a homogenous microemulsion at 20° C. when added to water at the salinity of said surface moisture on the particulate solids to be sprayed and at a water to hydrocarbon ratio in the range between 99:1 and 85:15; and (b) forming a microemulsion by the resulting admixture of said blend and said surface moisture between said solids whereby the cohesive strength of such solids when frozen is reduced.
Claim 3
Dependent Claim
30 words
The method according to claim 1 wherein said ratio is about 95:5 and said microemulsion when contacted with wet particulate solids will form a water-in-oil coarse emulsion at 20° C.
Claim 4
Dependent Claim
227 words
A method according to claim 1 wherein said blend of surfactants consists of: (A) an alkali metal, ammonium, alkyl ammonium, alkanol ammonium or ethoxylated alkanol ammonium salt of an alkyl or alkyl aryl sulfonic acid of the generic formula R--SO.sub.3 H wherein R is an alkyl or alkyl benzene group containing 8-30 carbon atoms in the alky chain and the benzene ring may be additionally substituted with one or two alkyl groups containing 1-3 carbon atoms each; (B) An ethoxylated surfactant of the generic formula: R.sub.1 X(CH.sub.2 CH.sub.2 O)Y wherein R 1 is an alkyl or mono- or di-alkyl aryl group containing 8 to 30 carbon atoms. X is ##STR2## Y is --H, --SO 3 - M + or --(PO 3 H) - M + wherein M + is an inorganic or ammonium cation including alkyl substituted ammonium cations; R 2 is an alky group containing 1 to 20 carbon atoms or a polyethoxy ether group containing from 1 to 30 (CH 2 CH 2 O) groups; R 3 is H or an alkyl group containing 1 to 3 carbon atoms; R 4 is a poly hydroxy group derived from glycerol, glycols, sorbitol, or various sugars; and, n is an integer of from 1 to 30 and said hydrocarbon is selected from the group consisting of No. 2 diesel oil, kerosene, naphthas, wite oils and pure alkane
Claim 5
Dependent Claim
31 words
A method according to claim 1 wherein said solids are coal and characterized further by a subsequent step of depositing in-situ a water-in-oil coarse emulsion on the surfaces of said solids.
Claim 6
Dependent Claim
30 words
The method according to claim 4 wherein said surface moisture is slightly saline water and said water-in-oil coarse emulsion is contiguous with and continuous on the surface of said particles.
Claim 7
Dependent Claim
45 words
The method according to claim 5 wherein said saline water contains from 0.1 to 1.5 percent by weight of sodium chloride, said lipophile is dinonylphenol reacted with 9 moles of ethylene oxide and said hdydrophile is the monoethanol amine salt of dodecyl xylene sulfonic acid.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-07 | 1990-01-06 | 1990-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-07 | 1994-01-06 | 1994-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-07 | 1998-01-06 | 1998-07-08 | $7700.00 | Window Closed / Lapsed |