US5332900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
On-line corrosivity monitor for petroleum products
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1993-02-16
•
Granted: 1994-07-26
•
Expires: 2013-02-16
Abstract
Abstract A method and system for monitoring the presence of a corrosive constituent in a petroleum product. [The invention detects the reflected] Reflected radiation is detected from a metal standard in the petroleum product which indicates the presence of the corrosivity constituent.
Inventors
- 👤 Horst Witzke
- 👤 Joshua Varon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:30
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/85; G01N33/00; G01N33/26; G01N33/28; G01N33/2835; G01N33/287
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
106 words
A method for on-line monitoring the corrosivity of a petroleum feedstream for the presence of a corrosive constituent comprising: (a) irradiating a metal that reacts with said corrosive constituent, said metal installed in said feedstream; (b) detecting the reflected radiation from said metal; (c) converting said reflected radiation to an electrical signal indicative of the magnitude of the reflected radiation; (d) repeating steps (a), (b), and (c) to give the change in reflectivity over a period of time; (e) determining a change in said electrical signal and relating it to the corrosivity of said feedstream of said metal from said reflectivity over a period of time.
Claim 2
Independent Claim
106 words
A method for on-line monitoring the corrosivity of a petroleum feedstream for the presence of a corrosive constituent comprising: (a) irradiating a metal that reacts with said corrosive constituent, said metal installed in said feedstream; (b) detecting the reflected radiation from said metal; (c) converting said reflected radiation to an electrical signal indicative of the magnitude of the reflected radiation; (d) repeating steps (a), (b), and (c) to give the change in reflectivity over a period of time; (e) determining a change in said electrical signal and relating it to the corrosivity of said feedstream of said metal from said reflectivity over a period of time.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein step (d) and step (e) are done continuously.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein said corrosive constituent includes sulfur or sulfur components.
Claim 5
Dependent Claim
10 words
The method of claim 1 wherein said metal includes copper.
Claim 6
Independent Claim
100 words
A system for determining the presence of a corrosive constituent in a petroleum product comprising: (a) a housing having valves for admitting and releasing a sample of said petroleum feedstream; (b) a source of visible or infra-red light; (c) a metal that reacts with said corrosive constituent; (d) means for irradiating said metal with said light; (e) means for detecting the reflected light from said metal over a period of time; (f) means for converting said reflected light into an electrical signal over a period of time, the change of which is related to the corrosivity of said petroleum product.
Claim 7
Independent Claim
100 words
A system for determining the presence of a corrosive constituent in a petroleum product comprising: (a) a housing having valves for admitting and releasing a sample of said petroleum feedstream; (b) a source of visible or infra-red light; (c) a metal that reacts with said corrosive constituent; (d) means for irradiating said metal with said light; (e) means for detecting the reflected light from said metal over a period of time; (f) means for converting said reflected light into an electrical signal over a period of time, the change of which is related to the corrosivity of said petroleum product.
Claim 8
Dependent Claim
14 words
The system of claim 5 wherein said means for converting gives a continuous signal.
Claim 9
Dependent Claim
16 words
The system of claim 5 further including a means to control the temperature of said housing.
Claim 10
Dependent Claim
18 words
The system of claim 5 wherein said means for irradiating and said means for detecting are fiber optics.
Claim 11
Dependent Claim
19 words
The system of claim 5 wherein said means for irradiating and said means for detecting are the same means.
Claim 12
Dependent Claim
20 words
The system of claim 5 wherein said metal is in the form of a metal thin film or metal coupon.
Claim 13
Dependent Claim
16 words
The system of claim 5 further comprising a strip chart recorder to record said electrical signals.
Claim 14
Dependent Claim
19 words
The system of claim 5 further comprising a computer having a data acquisition card to record said electrical signals.
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) | 1997-07-25 | 1998-01-24 | 1998-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-25 | 2002-01-24 | 2002-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-25 | 2006-01-24 | 2006-07-26 | $7700.00 | Window Closed / Lapsed |