US4542253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of phosphate and thiophosphate esters neutralized with water soluble amines as ethylene furnace anti-coking antifoulants
Assignee: Nalco Exxon Energy Chemicals LP
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Filing: 1984-05-04
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Granted: 1985-09-17
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Expires: 2004-05-04
Abstract
Abstract An improved method of reducing fouling and corrosion in ethylene cracking furnaces using petroleum feedstocks, the improvement comprising treating the petroleum feedstock with at least 10 ppm of a compound chosen from the group consisting of phosphite esters, phosphate esters, thiophosphite esters, thiophosphate esters and mixtures thereof, said esters being characterized by the formulas: ##STR1## where X equals S or O, and R 1 , R 2 , and R 3 , are each independently selected from the group consisting of hydrogen, water soluble amine, alkyl, aryl, alkaryl, cycloalkyl, alkenyl, and aralkyl group provided that in at least one and not more than two of each R 1 , R 2 , and R 3 are water soluble amines having partition coefficients greater than 1.0.
Inventors
- 👤 Morris Kaplan
- 👤 William A. Lindley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:25
CPC Classifications
C; C10; C10G; C10G9/00; C10G9/14; C10G9/16; C07; C07C; C07C4/00; C07C4/02; C07C7/00; C07C7/20; C10G75/00; C10G75/02; C10G75/04; Y; Y10; Y10S; Y10S585/00; Y10S585/949; Y10S585/95
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
154 words
An improved method of reducing fouling and corrosion in ethylene cracking furnaces using petroleum feedstocks, the improvement comprising admixing the petroleum feedstock with at least 10 ppm of a compound chosen from the group consisting of phosphite esters, phosphate esters, thiophosphite esters, thiophosphate esters and mixtures thereof, said esters being characterized by the formulas: ##STR9## where X equals S or O, and R 1 , R 2 , and R 3 , are each independently selected from the group consisting of hydrogen, water soluble amine, alkyl, aryl, alkaryl, cycloaklyl, alkenyl, and arylalkyl group provided that in at least one and not more than two of each R 1 , R 2 , and R 3 are water soluble amines having partition coefficients greater than about 3.0 and at least one of R 1 , R 2 , and R 3 is selected from the group consisting of alkyl, aryl, alkaryl, cycloaklyl, alkenyl, and arylalkyl.
Claim 2
Dependent Claim
154 words
An improved method of reducing fouling and corrosion in ethylene cracking furnaces using petroleum feedstocks, the improvement comprising admixing the petroleum feedstock with at least 10 ppm of a compound chosen from the group consisting of phosphite esters, phosphate esters, thiophosphite esters, thiophosphate esters and mixtures thereof, said esters being characterized by the formulas: ##STR9## where X equals S or O, and R 1 , R 2 , and R 3 , are each independently selected from the group consisting of hydrogen, water soluble amine, alkyl, aryl, alkaryl, cycloaklyl, alkenyl, and arylalkyl group provided that in at least one and not more than two of each R 1 , R 2 , and R 3 are water soluble amines having partition coefficients greater than about 3.0 and at least one of R 1 , R 2 , and R 3 is selected from the group consisting of alkyl, aryl, alkaryl, cycloaklyl, alkenyl, and arylalkyl.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein the ester is a blend of the mono and di isooctylthiophosphate ester.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein the ester is a blend of the mono and di isooctylphosphate ester.
Claim 5
Dependent Claim
11 words
The method of claim 1 wherein the ester is di n-butylphosphite.
Claim 6
Dependent Claim
12 words
The method of claim 1 wherein the water soluble amine is morpholine.
Claim 7
Dependent Claim
12 words
The method of claim 2 wherein the water soluble amine is morpholine.
Claim 8
Dependent Claim
12 words
The method of claim 3 wherein the water soluble amine is morpholine.
Claim 9
Dependent Claim
23 words
The method of claim 1 wherein the water soluble amine is selected from the group consisting of: Morpholine, Ethylene Diamine, Monoethanolamine, and Methoxypropylamine.
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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) | 1988-09-16 | 1989-03-18 | 1989-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-16 | 1993-03-18 | 1993-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-16 | 1997-03-18 | 1997-09-17 | $7700.00 | Window Closed / Lapsed |