US3726644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow calorimeter
Assignee: Université de Sherbrooke
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Filing: 1970-02-24
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Granted: 1973-04-10
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Expires: 1990-02-24
Abstract
Abstract The invention relates to a flow microcalorimeter wherein the reactant fluids are injected in one tubular flow chamber and reacted while mixing and flowing therethrough and a heat exchange means is associated with the tubular flow chamber wherethrough a fluid is circulated in a reverse flow direction. Measurements can be made in either the adiabatic or the isothermal mode depending on the relative flow of the reactant fluids and the heat exchange fluids. In some applications, such as when very fine measurements are required, thermal effects unrelated to the mixing can be cancelled out by introducing the already mixed and reacted fluids into a similar tubular flow chamber with a similar heat exchanger, this arrangement including a differentially coupled temperature sensing means associated with the outlets of said heat exchange means.
Inventors
- 👤 J Desnoyers
- 👤 C Jolicoeur
- 👤 P Picker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:25
CPC Classifications
G; G01; G01K; G01K17/00; G01K17/02; G01N; G01N25/00; G01N25/20; G01N25/48; G01N25/4873
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
35 words
A flow calorimeter as defined in claim 1, wherein the heat-exchange sections of said first and second tubes and the mixing region of said first tube are disposed within an evacuated chamber for thermal insulation.
Claim 2
Dependent Claim
171 words
A flow calorimeter as defined in claim 1 including a third tube which has an inlet end and a discharge end, the inlet end of said third tube being serially connected with the discharge end of said first tube to receive said fluid mixture therefrom, a fourth tube with a circulation of a heat-exchange liquid identical to that in the second tube; said third and fourth tubes having dimensions the same as said first and second tubes, respectively, and having co-extensive heat-exchange sections made of thermal conductive material and juxtaposed to one another in a close heat-exchange relationship with each other; said second pump means also including means for circulating said heat-exchange liquid through the fourth tube in a direction opposite to the direction of flow of liquid in the third tube , means for controlling the temperatures of said fluids in the third and fourth tubes, and temperature sensing means for measuring the temperature of said heat-exchange liquid adjacent the outlet end of the heat-exchange section of the fourth tube.
Claim 3
Dependent Claim
28 words
A flow calorimeter as defined in claim 3, including means for mounting all of said first, second, third and fourth tubes in the same temperature heat insulated environment.
Claim 4
Dependent Claim
22 words
A flow calorimeter as defined in claim 3, including means for comparing the temperature sensed by the two said temperature sensing means.
Claim 5
Dependent Claim
203 words
A differential flow calorimeter comprising first and second essentially identical fluid flow systems disposed within a heat insulated chamber, each one of said fluid flow systems including a first tube for circulating a fluid mixture, a second tube for circulating a heat-exchange fluid, and a heat exchanger formed by juxtaposed sections of said first and second tubes, the first tube of each system including a pair of feed tubes, such that two different liquids can be introduced into the first tube of the first system and mixed within the first tube of the first of said fluid flow systems upstream from the heat exchanger thereof, means for controllably circulating said fluid mixture successively through the first tube of the first fluid flow system and the first tube of the second fluid flow system, means for controllably circulating said heat exchange liquid through said second tubes in such a manner that in each of one of said heat exchangers said fluid mixture and said heat-exchange liquid flow in opposite directions, means for controlling temperatures at the inlet ends of said first and second tubes, and temperature sensing means for comparing the temperature of said heat-exchange liquid adjacent the outlet ends of said heat exchangers.
Claim 6
Dependent Claim
17 words
A differential flow calorimeter according to claim 6, wherein said heat insulated chamber is a vacuum chamber.
Claim 7
Dependent Claim
42 words
A differential flow calorimeter as defined in claim 6, wherein said temperature sensing means comprises a thermistor disposed in thermal contact with said heat-exchange liquid adjacent the outlet end of each heat exchanger, said thermistors being connected across a wheatstone bridge circuit.
Claim 8
Dependent Claim
50 words
A differential flow calorimeter as defined in claim 7, wherein each one of said first and second tubes comprises a length of thin walled small diameter stainless steel tubing; and wherein said said lengths are silver soldered to one another in the vicinity of the heat exchanger juxtaposed sections thereof.
Claim 9
Dependent Claim
33 words
A differential flow calorimeter as defined in claim 9, wherein said means for controlling temperatures comprises a constant temperature liquid bath and a thermostating jacket through which said liquid is caused to circulate.
Claim 10
Independent Claim
148 words
A method for obtaining calorimetry data of a mixture of two fluids, comprising the steps of controlling the temperature of the two fluids and injecting said fluids in a first flow mixing tube and passing the mixture of said fluids through the first tube of a first counterflow heat exchanger such that mixing of the two fluids is upstream from the heat exchanger, controlling the temperature of a heat exchange liquid and passing said heat-exchange liquid through the second tube of said mixture, said second tube of the heat exchanger being co-extensive and in close heat exchange relationship with the first tube of the heat exchanger, controlling the relative flow rates in the two tubes of the heat exchanger to determine the mode of heat exchange therein, and measuring any temperature variation of said heat exchange liquid adjacent the outlet end of the second tube of the heat-exchanger.
Claim 11
Dependent Claim
105 words
A method as claimed in claim 11, comprising the additional steps of passing said fluid mixture through a duplicate mixing tube and a duplicate first tube of a duplicate counterflow heat-exchanger, passing said heat exchange liquid through a duplicate second tube of said duplicate counterflow heat exchanger, thermostating said two fluids upstream from said first mixing tube, thermostating said fluid mixture upstream from said duplicate mixing tube, thermostating said heat exchange liquid upstream from said second tubes of said first and duplicate heat exchangers, and comparing the temperature of said heat exchange liquids immediately downstream from said second tubes of said first and duplicate heat-exchangers.
References Cited (Backward Citations)
US3453880A
Cited
US3505024A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |