US3753653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for gaseous-phase chemical reaction analysis
Assignee: Individual
•
Filing: 1971-03-01
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Granted: 1973-08-21
•
Expires: 1991-03-01
Abstract
Abstract Method and apparatus for gas analysis by chemical reaction in the gas phase, and determination of the components by chromatographic detecting means, comprising the steps of injecting a sample into a gaseous carrier stream, dividing the sample-carrying gaseous carrier stream into at least two parts for being conveyed through independent supply branches, passing at least one of the branched streams through a chemical reactor for selectively modifying the composition of the sample, adjusting the residence of the parts in the branches to different times, and conveying the branched parts or streams into a passage leading to the detecting means, so that they will arrive there separately and without interference. The invention also relates to an apparatus for carrying out the method, for analyzing the gases by chemical reaction and determination of the components by chromatographic detecting means.
Inventors
- 👤 A Brieva
- 👤 V Lopez
- 👤 N Soulages
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:15
CPC Classifications
G; G01; G01N; G01N31/00; G01N30/00; Y; Y10; Y10T; Y10T436/00; Y10T436/21; Y10T436/212; Y10T436/214; Y10T436/216
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
30 words
The method as defined in claim 1, further comprising the step of adjusting the quantity of the sample introduced into each branch by the rate of the carrier gas flow.
Claim 2
Dependent Claim
33 words
The method as defined in claim 1, wherein the chemical reactors are filled with different chemicals in each branch for selectively reacting with the different types of gas components contained in the sample.
Claim 3
Dependent Claim
19 words
The method as defined in claim 3, wherein the chemicals for selectively reacting with different gas components are absorbents.
Claim 4
Dependent Claim
27 words
The method as defined in claim 1, further comprising the step of adjusting the residence time of the carrier gas in each branch by flow restricting means.
Claim 5
Dependent Claim
30 words
The method as defined in claim 1, further comprising the step of adjusting the residence time of the carrier gas in at least one branch by adding a dead volume.
Claim 6
Dependent Claim
29 words
The method as defined in claim 1, further comprising the step of adjusting the residence time of the carrier gas in at least one branch by inserting a capillary.
Claim 7
Dependent Claim
15 words
The method as defined in claim 1, wherein the temperature in each branch is different.
Claim 8
Dependent Claim
16 words
The method as defined in claim 1, wherein the temperature in each branch is the same.
Claim 9
Dependent Claim
39 words
The method as defined in claim 1, further comprising the step of moistening the carrier gas stream before injecting the sample into the gaseous carrier stream so as to maintain unchanged the concentration of the chemicals in the reactors.
Claim 10
Dependent Claim
152 words
The method as defined in claim 1, for analysis of gasoline containing saturated aromatic and olefinic hydrocarbons, comprising the steps of feeding through a first branch line part of the sample, in a gaseous carrier stream, over an absorbent mixture of perchloric acid and mercury perchlorate, thereby absorbing aromatic and olefinic hydrocarbons, while saturated hydrocarbons pass unmodified, feeding through a second branch line part of the sample without arrangement of absorbers, so that the entire sample leaves unmodified, and feeding through a third branch line part of the sample over an absorbent mixture of sulfuric acid and mercury sulfate, thereby absorbing olefins and allowing saturates and aromatics to pass through unmodified, and successively admitting the parts from the branch lines to the detecting means and thereby determining the percentage of each component of the sample, the operating temperature being 70*C and the entire time of the analysis amounting to about five minutes.
Claim 11
Independent Claim
110 words
An apparatus for gas analysis by chemical reaction in the gas phase and determination of the components by chromatographic detecting means, comprising means for injecting a sample into a gaseous carrier stream, a gas-supply conduit, gas-flow dividing means in said conduit, at least two supply branch lines being fed through said dividing means, means in at least one branch line for causing chemical modification in the components of the sample, a common outlet conduit for all branch lines with connecting means thereof to the detecting means, and flow controlling means in said branch lines, whereby the flow from each line will reach the detecting means separately and without mutual interference.
Claim 12
Dependent Claim
19 words
The apparatus as defined in claim 12, wherein said means for chemical modification is constituted by a chemical absorber.
Claim 13
Dependent Claim
19 words
The apparatus as defined in claim 12, wherein said means for chemical modification is constituted by a chemical reactor.
Claim 14
Dependent Claim
20 words
The apparatus as defined in claim 12, wherein said flow controlling means is in the form of a flow restrictor.
Claim 15
Dependent Claim
26 words
The apparatus as defined in claim 12, wherein said flow controlling means is in the form of a dead volume in at least one branch line.
Claim 16
Dependent Claim
25 words
The apparatus as defined in claim 12, wherein said flow controlling means is in the form of a capillary in at least one branch line.
Claim 17
Dependent Claim
26 words
The apparatus as defined in claim 12, further comprising means for moistening the carrier gas stream before the sample is injected into the gaseous carrier stream.
References Cited (Backward Citations)
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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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |