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US4126650A
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US
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Synthesis of mono-alkyl acid phosphates with high mono-content
Assignee: Stauffer Chemical Co
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Filing: 1977-04-27
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Granted: 1978-11-21
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Expires: 1997-04-27
Abstract
Abstract Mono-alkyl acid phosphates having the formula: ##STR1## wherein R is straight or branched alkyl having from 1 to about 25 carbon atoms, are prepared by reacting alcohol with P 2 O 5 . The process involves suspension of P 2 O 5 in a heel of product comprised of a mixture of mono-alkyl acid phosphate, di-alkyl acid phosphate and free H 3 PO 4 . Alcohol is added to the heel last, followed by mixing, and then addition of water. A mixture of mono- and dialkyl acid phosphate is obtained with a mono-content of over about 70 percent by weight.
Inventors
- 👤 Francis A. Via
- 👤 Sophia Y. Liu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:48
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/098; C07F9/11
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
112 words
A method of preparing mono-alkyl acid phosphates having the formula: ##STR6## wherein R is straight or branched alkyl having from 1 to about 25 carbon atoms, comprising the steps of (1) contacting P 2 O 5 with a heel, wherein said heel is comprised of monoalkyl acid phosphate, di-alkyl acid phosphate and H 3 PO 4 ; (2) contacting an alcohol having the formula: ROH wherein R is as defined above, with the P 2 O 5 and heel mixture; followed by mixing until an intermediate is formed having the formula: ##STR7## wherein R is as defined above, and then (3) addition of water, followed by mixing until the reaction is complete.
Claim 2
Independent Claim
112 words
A method of preparing mono-alkyl acid phosphates having the formula: ##STR6## wherein R is straight or branched alkyl having from 1 to about 25 carbon atoms, comprising the steps of (1) contacting P 2 O 5 with a heel, wherein said heel is comprised of monoalkyl acid phosphate, di-alkyl acid phosphate and H 3 PO 4 ; (2) contacting an alcohol having the formula: ROH wherein R is as defined above, with the P 2 O 5 and heel mixture; followed by mixing until an intermediate is formed having the formula: ##STR7## wherein R is as defined above, and then (3) addition of water, followed by mixing until the reaction is complete.
Claim 3
Dependent Claim
25 words
The method of claim 1 further comprising the final step of adding H 2 O 2 to the reaction mixture following the addition of water.
Claim 4
Dependent Claim
45 words
The method of claim 2 wherein the reaction temperature is maintained from about 20° C. to about 180° C. prior to the addition of water and from about 40° C. to about 200° C. following the addition of water and H 2 O 2 .
Claim 5
Dependent Claim
31 words
The method of claim 2 wherein R is selected from the group consisting of methyl, ethyl, propyl, isopropyl, butyl, tert-butyl, pentyl, heptyl, octyl, decyl, dodecyl, hexadecyl, nonadecyl, lauryl, palmityl, and stearyl.
Claim 6
Independent Claim
112 words
A method of preparing mono-stearyl acid phosphate comprising the steps of (1) contacting P 2 O 5 with a heel, wherein said heel is comprised of mono-stearyl acid phosphate, di-stearyl acid phosphate and H 3 PO 4 ; (2) contacting stearyl alcohol with the P 2 O 5 and heel mixture and heating the reactants to a temperature sufficient to melt the stearyl alcohol and mixing while maintaining a reaction temperature sufficient to prevent solidification of said stearyl alcohol until an intermediate is formed having the formula: ##STR8## wherein R is stearyl, followed by (3) addition of water and H 2 0 2 , followed by mixing until the reaction is complete.
Claim 7
Independent Claim
112 words
A method of preparing mono-stearyl acid phosphate comprising the steps of (1) contacting P 2 O 5 with a heel, wherein said heel is comprised of mono-stearyl acid phosphate, di-stearyl acid phosphate and H 3 PO 4 ; (2) contacting stearyl alcohol with the P 2 O 5 and heel mixture and heating the reactants to a temperature sufficient to melt the stearyl alcohol and mixing while maintaining a reaction temperature sufficient to prevent solidification of said stearyl alcohol until an intermediate is formed having the formula: ##STR8## wherein R is stearyl, followed by (3) addition of water and H 2 0 2 , followed by mixing until the reaction is complete.
References Cited (Backward Citations)
US3333029A
Cited
US3318982A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-20 | 1982-05-22 | 1982-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-20 | 1986-05-22 | 1986-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-20 | 1990-05-22 | 1990-11-21 | $7700.00 | Window Closed / Lapsed |