EP0070404A2
Expired / Lapsed
EP
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A method and equipment to perform porosimetric analyses
Assignee: Fisons Instruments SpA
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Filing: 1982-06-24
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Granted: —
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Expires: 2002-06-24
Abstract
Abstract This invention concerns a method and an equipment to perform porosimetric analyses, in particular following known analyses performed by a so-called mercury methods, wherein volumetric variations of mercury placed in a vessel are recorded, said variations being due to a mercury penetration Into the pores of a solid sample placed in the same vessel under mercury pressure variations. According to the invention further analyses are carried-out by lowering mercury pressure from a maximum value substantially to ambient value, following a predetermined law in function of time, for instance and preferably a pressure reduction at constant speed, and by simultaneously detecting the volume variations of mercury which comes out of the sample pores when pressure decreases. Said detection, when performed in relation and/or in addition to the traditional one during pressure increase, allows to obtain a pressure-volume mercury curve which provides further data on the porosimetric characteristics of the sample, in particular related to the shape of the pores of same.
Inventors
- 👤 Giorgio Sisti
- 👤 Ermete Riva
- 👤 Bruno Tosi
- 👤 Pietro Italiano
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 19:13
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/08; G01N15/088; G01N15/0886
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
104 words
1) A method to perform porosimetric analyses,of the type comprising the stages of placing a solid sample and a quantity of a suitable liquid, preferably mercury,into a test vessel, of submitting the liquid to"an increasing pressure, of detecting the liquid volumetric variations due to its penetration into the pores of the sample while pressure varies, and of bringing said pressure from a maximum value substantially to the ambient value, wherein said pressure reduction is carried-out following a predetermined law in function of time and wherein the volume variations of said liquid due to liquid outoming from the sample pores, are detected while pressure decreases.
Claim 2
Dependent Claim
104 words
1) A method to perform porosimetric analyses,of the type comprising the stages of placing a solid sample and a quantity of a suitable liquid, preferably mercury,into a test vessel, of submitting the liquid to"an increasing pressure, of detecting the liquid volumetric variations due to its penetration into the pores of the sample while pressure varies, and of bringing said pressure from a maximum value substantially to the ambient value, wherein said pressure reduction is carried-out following a predetermined law in function of time and wherein the volume variations of said liquid due to liquid outoming from the sample pores, are detected while pressure decreases.
Claim 3
Dependent Claim
17 words
2) A method according to claim 1, wherein said pressure reduction is carried-out at a controlled speed.
Claim 4
Dependent Claim
17 words
3) A method according to claim 2, wherein said pressure reduction in carried-out at a constant speed.
Claim 5
Dependent Claim
35 words
4) A method according to claim 2, wherein pressure is recorded, a derivative of same in time is drawn and a pressure exhaust device is controlled in function of the instant value of said derivative.
Claim 6
Dependent Claim
132 words
5) An equipment for porosimetric detections, comprising a test apparatus, a high pressure circuit for pressurization of the apparatus by a high-pressure liquid, at least a pressure multiplier acting on said high pressure circuit, a low pressure circuit acting on said pressure multiplier and having at least a pumping unit for a low-pressure fluid, as well as a by-pass for the pumping unit, capable of releasing said low pressure by means of at least an exhaust control valve for the exhaust or return of said low-pressure fluid, wherein said equipment comprises a pressure detector in said high pressure circuit, a device to correlate the pressure recorded by said pressure detector with time and control means for said exhaust control valve in said low pressure circuit, acting under the control of said device.
Claim 7
Dependent Claim
132 words
5) An equipment for porosimetric detections, comprising a test apparatus, a high pressure circuit for pressurization of the apparatus by a high-pressure liquid, at least a pressure multiplier acting on said high pressure circuit, a low pressure circuit acting on said pressure multiplier and having at least a pumping unit for a low-pressure fluid, as well as a by-pass for the pumping unit, capable of releasing said low pressure by means of at least an exhaust control valve for the exhaust or return of said low-pressure fluid, wherein said equipment comprises a pressure detector in said high pressure circuit, a device to correlate the pressure recorded by said pressure detector with time and control means for said exhaust control valve in said low pressure circuit, acting under the control of said device.
Claim 8
Dependent Claim
60 words
6) An equipment according to claim 5, wherein said device to correlate the pressure with time is a derivation device and wherein said control means of the valve includes a window chopper acting on a mechanical control device of the valve when the value of the derivative exceeds a given value range which can be predetermined in width and/or position.
Claim 9
Dependent Claim
32 words
7) An equipment according to claim 6, wherein said mechanical control device includes a motor means to move a needle valve stem, said valve having a cone-shaped shutter and a cylindrical seat.
Claim 10
Dependent Claim
35 words
8) An equipment according to claim 7, wherein said motor means includes a driving shaft rotating in both directions and capable of actuating a kinematic chain controlling the axial movements of said needle valve stem.
Claim 11
Dependent Claim
31 words
9) An equipment according to claim 3, wherein said kinematic chain comprises a screw-mut coupling to transform the rotatory movements of said driving shaft into axial movements of said valve stem.
Claim 12
Dependent Claim
33 words
10) An equipment according to claim 9, wherein said screw-nut coupling comprises a threaded bushing housing said valve stem and capable of rotating and axially moving under the control of said driving shaft.
Claim 13
Dependent Claim
60 words
11) An equipment according to claim 10, wherein said threaded bushing is rotated in both directions by said driving shaft due to the coupling of an axially elongated pinion, integral to said driving shaft, and of a gear wheel integral to said bushing and meshing with said pinion, said wheel being able to axially move whith respect to said pinion.
Claim 14
Dependent Claim
29 words
12)An equipment according to claim 10, wherein said valve stem is housed, in an axially locked but rotationally freee way, inside said bushing, the stem being blocked against rotations.
Claim 15
Dependent Claim
27 words
13) An equipment according tu claim 5,wherein said valve stem carries, outside the valve body, means integral to the same and capable of acting on run stops.
References Cited (Backward Citations)
No citation records indexed.
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