CA2304201A1 - Analyzer for temperature sensitive colloidal mixtures - Google Patents
Analyzer for temperature sensitive colloidal mixtures Download PDFInfo
- Publication number
- CA2304201A1 CA2304201A1 CA002304201A CA2304201A CA2304201A1 CA 2304201 A1 CA2304201 A1 CA 2304201A1 CA 002304201 A CA002304201 A CA 002304201A CA 2304201 A CA2304201 A CA 2304201A CA 2304201 A1 CA2304201 A1 CA 2304201A1
- Authority
- CA
- Canada
- Prior art keywords
- measurement
- colloidal
- temperature
- light
- colloidal mixture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000203 mixture Substances 0.000 title claims abstract 24
- 238000005259 measurement Methods 0.000 claims abstract 31
- 238000000034 method Methods 0.000 claims abstract 26
- 239000000126 substance Substances 0.000 claims abstract 10
- 239000002023 wood Substances 0.000 claims abstract 3
- 239000006229 carbon black Substances 0.000 claims abstract 2
- 239000004927 clay Substances 0.000 claims abstract 2
- 239000000454 talc Substances 0.000 claims abstract 2
- 229910052623 talc Inorganic materials 0.000 claims abstract 2
- 238000010521 absorption reaction Methods 0.000 claims 9
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims 2
- 238000002835 absorbance Methods 0.000 claims 2
- 239000000835 fiber Substances 0.000 claims 2
- 238000001914 filtration Methods 0.000 claims 2
- 230000001678 irradiating effect Effects 0.000 claims 2
- 230000007704 transition Effects 0.000 claims 1
- 239000000084 colloidal system Substances 0.000 abstract 2
- 239000011347 resin Substances 0.000 abstract 2
- 229920005989 resin Polymers 0.000 abstract 2
- 229910052570 clay Inorganic materials 0.000 abstract 1
- 239000000945 filler Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
- G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
- G01N21/534—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke by measuring transmission alone, i.e. determining opacity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/34—Paper
- G01N33/343—Paper pulp
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
A method and apparatus for characterizing colloids by successive measurements of light attenuation or emission of a colloidal mixture at two or more temperatures and at one or more wavelengths. The difference or ratio of the measurements at two or more temperatures provides a measure of the colloidal stability with respect to temperature. The amount of certain organic colloids that are unstable to temperature variation may be determined from the magnitude of the measurement change. In appropriate mixtures, this method provides a means to distinguish components of colloidal substances based. This method may be specifically applied to determine the stability and concentration of colloidal pitch or wood resin in a pulp or paper process water. In this context it may be used to distinguish colloidal pitch or wood resin from talc, clay, carbon black or other fillers.
Claims (24)
1. A method of identifying and measuring a characteristic of a colloidal mixture comprising the steps of:
(a) irradiating at least some of the colloidal mixture at a first temperature with light in an ultraviolet-visible region for obtaining a first measurement of at least one of absorption, emission and scattering of the light;
(b) waiting for the temperature of the colloidal mixture to change;
(c) irradiating at least some of the colloidal mixture at a second temperature with light in the ultraviolet-visible region for obtaining a second measurement of at least one of the same of absorption, emission and scattering of the light as defined in step (a); and (d) determining the characteristic of the colloidal mixture based on the first measurement and the second measurement.
(a) irradiating at least some of the colloidal mixture at a first temperature with light in an ultraviolet-visible region for obtaining a first measurement of at least one of absorption, emission and scattering of the light;
(b) waiting for the temperature of the colloidal mixture to change;
(c) irradiating at least some of the colloidal mixture at a second temperature with light in the ultraviolet-visible region for obtaining a second measurement of at least one of the same of absorption, emission and scattering of the light as defined in step (a); and (d) determining the characteristic of the colloidal mixture based on the first measurement and the second measurement.
2. A method as defined in claim 1, wherein the first measurement and the second measurement are obtained at a same first wavelength.
3. A method as defined in claim 1, wherein the first measurement and the second measurement are each obtained at a same first wavelength and at a same second wavelength.
4. A method as defined in claim 3, wherein the first measurement and the second measurement comprise at least a same one of:
a) an absorbance ratio between the absorbance of the light at the first wavelength and at the second wavelength, b) a scattering ratio between the scattering of the light at the first wavelength and at the second wavelength, and c) an emission ratio between the emission of the light at the first wavelength and at the second wavelength.
a) an absorbance ratio between the absorbance of the light at the first wavelength and at the second wavelength, b) a scattering ratio between the scattering of the light at the first wavelength and at the second wavelength, and c) an emission ratio between the emission of the light at the first wavelength and at the second wavelength.
5. A method as defined in any of claims 1 to 4, wherein the characteristic is a first or second derivative of a function expressing a temperature dependence of absorption, emission, or scattering derived from a relationship based on the first measurement and the second measurement.
6. A method as defined in any of claims 1 to 5, wherein the characteristic of the colloidal mixture is a measure of an amount of a substance within the colloidal mixture determined in dependence upon the variation of the measurements in response to the change in temperature.
7. A method as defined in claim 6, wherein the method is for measuring the characteristic in both inorganic colloidal substances and organic colloidal substances.
8. A method as defined in claim 7, wherein the organic colloidal substance is at least one of a colloidal pitch and a colloidal wood extractive.
9. A method as defined in claim 7, wherein the inorganic colloidal substance is at least one of a clay, a TiO2, carbon black, and a talc.
10. A method as defined in claim 6, further including the step of determining a stability of the colloidal mixture based on the measure of the amount of the substance.
11. A method as defined in claim 10, further including the step of determining a temperature stability of the colloidal mixture based on the measure of the amount of the substance.
12. A method as defined in claim 11. further including the step of determining an amount of colloidal pitch in the colloidal mixture based on a temperature dependency of the absorption, emission, or scattering.
13. A method as defined in claim 6, further including the step of identifying a change in a state of the substance based on the measure of the amount of the substance, said change including a dissolved state and a colloidal state.
14. A method as defined in claim 1, wherein an initial step comprises the step of filtering the colloidal mixture for substantially removing fiber therefrom.
15. A method as defined in any of claims 1 to 14, wherein a difference between the first temperature and the second temperature is at least 30°C.
16. A method as defined in claim 3 or 4 wherein the characteristic is a measure for one of a critical concentration and a critical temperature for a transition between a dissolved state and a colloidal state determined in dependence upon the variation of the measurements in response to the change in temperature.
17. A method as defined in any of claims 1, 2, 3, 4, 5, 6, or 16, wherein the characteristic is a measure of a stability of the colloidal mixture determined in dependence upon the variation of the measurements in response to the change in temperature.
18. A method as defined in any of claims 1, 2, 3, 4, 5, 6, or 16, wherein the characteristic is a measure of a composition of the colloidal mixture determined in dependence upon the variation of the measurements in response to the change in temperature.
19. A method as defined in claim 18, wherein the colloidal mixture includes a component that is temperature sensitive when measuring the absorption, emission, or scattering of the light, and a component that is temperature insensitive when measuring the absorption, emission, or scattering of the light.
20. A method as defined in claim 1, wherein a suitable temperature difference between the first and the second temperature is determined by obtaining a first and a second measurement, both at the first and the second wavelength.
21. An apparatus arranged to identify and measure a characteristic of a colloidal mixture comprising:
filtration means arranged to substantially remove fiber from the colloidal mixture;
detecting means arranged to obtain a same first measurement and a same second measurement of at least one of an absorption, emission, and scattering of light in an ultraviolet-visible region, said first measurement being obtained at at least a first wavelength of the light and at a first temperature when the colloidal mixture is irradiated with the light, said second measurement being obtained at at least the first wavelength of the light and at a second temperature when the colloidal mixture is irradiated with the light;
and a suitably programmed processor arranged to determine the characteristic of the colloidal mixture based on the first measurement and the second measurement.
filtration means arranged to substantially remove fiber from the colloidal mixture;
detecting means arranged to obtain a same first measurement and a same second measurement of at least one of an absorption, emission, and scattering of light in an ultraviolet-visible region, said first measurement being obtained at at least a first wavelength of the light and at a first temperature when the colloidal mixture is irradiated with the light, said second measurement being obtained at at least the first wavelength of the light and at a second temperature when the colloidal mixture is irradiated with the light;
and a suitably programmed processor arranged to determine the characteristic of the colloidal mixture based on the first measurement and the second measurement.
22. An apparatus as defined in claim 21 further comprising control means arranged to control the detecting means such that measurements are made when the colloidal mixture is at predetermined first and second temperatures.
23. An apparatus as defined in claim 22, wherein said characteristic is a first or second derivative of a function expressing the temperature dependence of the absorption, emission, or scattering derived from a relationship including the first measurement and the second measurement.
24. A method as defined in claim 1 wherein the first measurement and the second measurement are at least one of absorption and scattering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2304201A CA2304201C (en) | 1997-09-18 | 1998-09-18 | Analyzer for temperature sensitive colloidal mixtures |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2,216,046 | 1997-09-18 | ||
| CA002216046A CA2216046A1 (en) | 1997-09-18 | 1997-09-18 | In-line sensor for colloidal and dissolved substances |
| PCT/CA1998/000871 WO1999014577A1 (en) | 1997-09-18 | 1998-09-18 | Analyzer for temperature sensitive colloidal mixtures |
| CA2304201A CA2304201C (en) | 1997-09-18 | 1998-09-18 | Analyzer for temperature sensitive colloidal mixtures |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2304201A1 true CA2304201A1 (en) | 1999-03-25 |
| CA2304201C CA2304201C (en) | 2010-09-14 |
Family
ID=25679622
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2304201A Expired - Fee Related CA2304201C (en) | 1997-09-18 | 1998-09-18 | Analyzer for temperature sensitive colloidal mixtures |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2304201C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018146379A1 (en) * | 2017-02-08 | 2018-08-16 | Valmet Automation Oy | Method and apparatus for determining degree of breaking down of fiber particles into fines in pulp |
-
1998
- 1998-09-18 CA CA2304201A patent/CA2304201C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018146379A1 (en) * | 2017-02-08 | 2018-08-16 | Valmet Automation Oy | Method and apparatus for determining degree of breaking down of fiber particles into fines in pulp |
| SE545617C2 (en) * | 2017-02-08 | 2023-11-14 | Valmet Automation Oy | Method and apparatus for determining degree of breaking down of fiber particles into fines in pulp |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2304201C (en) | 2010-09-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20170918 |