CN110987734A - Solid washing material of dry-method laser particle size analyzer and cleaning method thereof - Google Patents
Solid washing material of dry-method laser particle size analyzer and cleaning method thereof Download PDFInfo
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- CN110987734A CN110987734A CN201911269442.5A CN201911269442A CN110987734A CN 110987734 A CN110987734 A CN 110987734A CN 201911269442 A CN201911269442 A CN 201911269442A CN 110987734 A CN110987734 A CN 110987734A
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- particle size
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means, e.g. by light scattering, diffraction, holography or imaging
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/34—Purifying; Cleaning
Abstract
The invention belongs to the technical field of laser particle size analyzers, and discloses application of microcrystalline cellulose in a cleaning dry-process laser particle size analyzer. The invention also provides a method for cleaning the dry-process laser particle size analyzer by utilizing the microcrystalline cellulose, and specifically, the microcrystalline cellulose is placed in the dry-process laser particle size analyzer, and a cleaning program is started for cleaning. The invention adopts microcrystalline cellulose as the washing material of the dry-process laser particle size analyzer, and can take away the light materials adsorbed on the pipeline and the wall of the analyzer by only adopting one material under the action of airflow, the cleaning effect is good, and the cleaning is only carried out once, no dust escapes in the whole cleaning process, so that the dry-process laser particle size analyzer is convenient and quick to clean, and the pipeline in the analyzer is not abraded after long-term use.
Description
Technical Field
The invention belongs to the technical field of laser particle size analyzers. And more particularly, to a solid washing material for a dry laser particle size analyzer and a washing method thereof.
Background
When a laser particle size analyzer is used for dry-method determination of materials which are light in weight, low in density, easy to adsorb and poor in flowability, if the materials in an instrument pipeline are not cleaned up, the secondary test result is affected, for example, shoulder peaks, tailing and the like appear in a particle size spectrum, and the detection reproducibility is poor. Therefore, finding the cleaning material suitable for the dry-process laser particle size analyzer has important significance for ensuring the accuracy of the dry-process determination of the laser particle size analyzer.
Patent CN106370566B provides a solid cleaning material for a dry laser particle size analyzer including barium sulfate and quartz powder, and a method for cleaning the dry laser particle size analyzer by using the solid cleaning material, which is to place the solid cleaning material in the dry laser particle size analyzer, start a sample injection program of the dry laser particle size analyzer for cleaning for the first time, and then start a cleaning function of the dry laser particle size analyzer for cleaning again. However, barium sulfate in the solid washing material provided by the invention is a material with a large specific gravity (about 4.5), and residual substances are taken away mainly by using the gravity action of the barium sulfate, so that the risk that the barium sulfate abrades pipelines and detector mirror surfaces of a laser particle analyzer exists in the process; in addition, the solid washing material has more components, and needs to be further washed by adopting an auxiliary surfactant, so that the washing effect of the single solid washing material of barium sulfate is not the washing effect of the single solid washing material of barium sulfate, the raw materials need to be mixed according to a certain proportion, the washing times are more, and the operation is troublesome.
Therefore, the method for cleaning the dry-method laser particle size analyzer, which has the advantages of simple process, high cleaning efficiency and no damage to the instrument, is found, and has important application value.
Disclosure of Invention
The invention aims to provide a solid washing material of a dry-process laser particle size analyzer and a cleaning method thereof, wherein the washing material consists of microcrystalline cellulose, and light materials adsorbed on a pipeline and a wall of the analyzer can be taken away by only one material under the action of airflow, so that the apparatus is free from damage, the cleaning effect is good, the cleaning effect can be achieved by cleaning once, no dust escapes in the whole cleaning process, and the dry-process laser particle size analyzer is convenient and quick to clean.
The invention aims to provide application of microcrystalline cellulose in cleaning a dry-method laser particle size analyzer.
It is another object of the present invention to provide the use of microcrystalline cellulose as a wash stock for a dry laser particle size analyzer.
Still another object of the present invention is to provide a solid purge for a dry laser particle size analyzer.
It is yet another object of the present invention to provide a method of cleaning a dry laser particle size analyzer.
The above purpose of the invention is realized by the following technical scheme:
the invention provides application of microcrystalline cellulose in cleaning a dry laser particle size analyzer.
The invention also provides application of the microcrystalline cellulose in washing materials used as a dry-process laser particle size analyzer.
Preferably, the average particle size of the microcrystalline cellulose is 60-250 μm.
The microcrystalline cellulose is a natural high molecular compound, is white, odorless and tasteless, is nontoxic and non-irritant crystalline powder consisting of porous particles, is easy to adsorb other materials, has good fluidity and small specific gravity of only 1.5, and hardly wears instruments. And the material is easily purchased in the market.
The invention also provides a solid washing material of the dry-process laser particle size analyzer, which consists of the microcrystalline cellulose.
Preferably, the average particle size of the microcrystalline cellulose is 60-250 μm.
In addition, the method for cleaning the dry laser particle size analyzer by using the solid washing material is also within the protection scope of the invention.
Preferably, the method is to place the microcrystalline cellulose in a dry laser particle size analyzer and start a cleaning procedure for cleaning.
Preferably, the dosage of the solid washing material is 0.5-1.0 g.
Preferably, the inlet pressure of the cleaning program is 2-4 bar.
Preferably, the sample injection speed of the cleaning is 30-60%.
Most preferably, the purge has a feed gas pressure of 3bar and a feed rate of 50%.
When the microcrystalline cellulose is used for cleaning the dry-method laser particle size analyzer, an excellent cleaning effect can be obtained by cleaning once, the result repeatability of the particle size of the sample tested by the cleaned particle size analyzer is good, the operation is quick and convenient, and the method has important application value in the fields of scientific research, detection and the like.
The invention has the following beneficial effects:
the material for washing provided by the invention can take away the light materials adsorbed on the pipeline and the wall of the dry-process laser particle size analyzer through only one material, so that the instrument is not damaged, the washing effect is good, the material can be washed once, no dust escapes in the whole washing process, and the dry-process laser particle size analyzer is convenient and quick to wash.
Drawings
FIG. 1 is a diagram of a first test using a dry laser particle size analyzer;
FIG. 2 is a diagram of a second test performed after a conventional cleaning of a dry laser particle size analyzer;
FIG. 3 is a spectrum of a third test performed after a dry laser particle size analyzer is cleaned by using the microcrystalline cellulose washing material of the present invention.
FIG. 4 is a graph of a first test using a dry laser particle size analyzer;
FIG. 5 is a spectrum of a second detection performed after a first cleaning of a dry laser particle analyzer by a barium sulfate mixture;
fig. 6 is a graph showing a third detection performed after a dry laser particle size analyzer was washed three times with a barium sulfate mixture.
Detailed Description
The invention is further described with reference to the drawings and the following detailed description, which are not intended to limit the invention in any way.
Reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated.
Example 1 laser particle size detection of amlodipine besylate
1. Amlodipine besylate particle size detection
The cleaning procedure parameters were as follows:
dispersion air pressure (intake air pressure): 3.0 bar;
sample introduction speed: 50 percent.
After the parameters are set, a proper amount of amlodipine besylate is placed in a dry laser particle size analyzer, and detection is started. The amlodipine besylate is light and easy to adhere to the pipeline, so the pipeline needs to be cleaned.
2. Cleaning method
(1) Conventional cleaning
And directly starting a cleaning program of the dry-method laser particle size analyzer for cleaning.
(2) Microcrystalline cellulose cleaning
And (3) placing 1g of microcrystalline cellulose (with the average particle size of 60-250 microns) in a dry-process laser particle size analyzer, starting a cleaning program of the dry-process laser particle size analyzer for cleaning, and then carrying out third particle size detection on the amlodipine besylate.
3. The result of the detection
Fig. 1 is a spectrum of a first detection performed by a dry laser particle size analyzer, fig. 2 is a spectrum of a second detection performed after a conventional cleaning of the dry laser particle size analyzer, and fig. 3 is a spectrum of a third detection performed after a cleaning of the dry laser particle size analyzer by a microcrystalline cellulose washing material according to the present invention. The results of the sample detection after washing by the two washing methods obtained by comparing the three spectra are shown in table 1.
TABLE 1
The spectra of the three detections show that the first detection result is equivalent to the third detection result, and the second detection result has obvious tailing, so that the parameter values are increased in different degrees. Compared with the conventional method, after the pipeline of the particle size analyzer is cleaned by microcrystalline cellulose, the particle size detection spectrum of the sample is obviously improved, and the difference with the first measurement result is not obvious. The microcrystalline cellulose cleaning effect is excellent, and the result repeatability of the sample tested by the particle size analyzer after cleaning is good.
Example 2 laser particle size detection of amlodipine besylate
1. Amlodipine besylate particle size detection
The cleaning procedure parameters were as follows:
dispersing air pressure: 2.0 bar;
sample introduction speed: 30 percent.
After the parameters are set, a proper amount of amlodipine besylate is placed in a dry laser particle size analyzer, and detection is started. The amlodipine besylate is light and easy to adhere to the pipeline, so the pipeline needs to be cleaned.
2. Cleaning method
(1) Conventional cleaning
And directly starting a cleaning program of the dry-method laser particle size analyzer for cleaning.
(2) Microcrystalline cellulose cleaning
And (3) placing 1g of microcrystalline cellulose (with the average particle size of 60-250 microns) in a dry-process laser particle size analyzer, starting a cleaning program of the dry-process laser particle size analyzer for cleaning, and then carrying out third particle size detection on the amlodipine besylate.
3. The detection results show that the first detection result is equivalent to the third detection result in the three detection spectrums, and the second detection result has obvious tailing, so that the parameter values are increased in different degrees. Compared with the conventional method, after the pipeline of the particle size analyzer is cleaned by microcrystalline cellulose, the particle size detection spectrum of the sample is obviously improved, and the difference with the first measurement result is not obvious. The microcrystalline cellulose cleaning effect is excellent, and the result repeatability of the sample tested by the particle size analyzer after cleaning is good.
Example 3 laser particle size detection of amlodipine besylate
1. Amlodipine besylate particle size detection
The cleaning procedure parameters were as follows:
dispersing air pressure: 4.0 bar;
sample introduction speed: 60 percent.
After the parameters are set, a proper amount of amlodipine besylate is placed in a dry laser particle size analyzer, and detection is started. The amlodipine besylate is light and easy to adhere to the pipeline, so the pipeline needs to be cleaned.
2. Cleaning method
(1) Conventional cleaning
And directly starting a cleaning program of the dry-method laser particle size analyzer for cleaning.
(2) Microcrystalline cellulose cleaning
And (3) placing 1g of microcrystalline cellulose (with the average particle size of 60-250 microns) in a dry-process laser particle size analyzer, starting a cleaning program of the dry-process laser particle size analyzer for cleaning, and then carrying out third particle size detection on the amlodipine besylate.
3. The detection results show that the first detection result is equivalent to the third detection result in the three detection spectrums, and the second detection result has obvious tailing, so that the parameter values are increased in different degrees. Compared with the conventional method, after the pipeline of the particle size analyzer is cleaned by microcrystalline cellulose, the particle size detection spectrum of the sample is obviously improved, and the difference with the first measurement result is not obvious. The microcrystalline cellulose cleaning effect is excellent, and the result repeatability of the sample tested by the particle size analyzer after cleaning is good.
Comparative example 1
1. Amlodipine besylate particle size detection
The cleaning procedure parameters were as follows:
dispersion air pressure (intake air pressure): 2.0 bar;
sample introduction speed: 30 percent.
After the parameters are set, a proper amount of amlodipine besylate is placed in a dry laser particle size analyzer, and detection is started. The amlodipine besylate is light and easy to adhere to the pipeline, so the pipeline needs to be cleaned.
2. Cleaning method
(1) Cleaning the barium sulfate mixture once
0.6g of barium sulfate, 0.4g of quartz powder and 0.1g of surfactant are placed in a dry-process laser particle size analyzer, and a cleaning program of the dry-process laser particle size analyzer is started to carry out primary cleaning, so that secondary particle size detection of the amlodipine besylate can be carried out.
(2) Barium sulfate mixture is washed three times
And (3) placing 0.6g of barium sulfate, 0.4g of quartz powder and 0.1g of surfactant in a dry-process laser particle size analyzer, starting a cleaning program of the dry-process laser particle size analyzer to carry out three times of cleaning, and then carrying out third time of particle size detection on the amlodipine besylate.
3. The result of the detection
Fig. 4 is a graph of a first detection performed by a dry laser particle size analyzer, fig. 5 is a graph of a second detection performed after a first cleaning of a barium sulfate mixture performed by the dry laser particle size analyzer, and fig. 6 is a graph of a third detection performed after a third cleaning performed by the barium sulfate mixture. The results of the sample detection after washing by the two washing methods obtained by comparing the three spectra are shown in table 2.
TABLE 2
The three detection results are different from one another, the detection result is obviously trailing after the barium sulfate is adopted for cleaning once before the second detection, and the parameter values are increased in different degrees, namely the effect of adopting the barium sulfate mixture for cleaning once is not ideal; the barium sulfate mixture is used for washing three times before the third detection, a slight tailing phenomenon still exists, and the effect of washing three times by using the barium sulfate mixture is still not ideal.
Comparative example 2
1. The method of example 1 was used to repeatedly wash the dry laser particle size analyzer with microcrystalline cellulose (average particle size 60-250 μm) and a barium sulfate mixture (0.6g barium sulfate, 0.4g quartz powder, and 0.1g surfactant), 5 times per day, 3 times each. And (5) observing the abrasion condition of the pipeline in the instrument.
2. After 2 weeks of testing, it was found that the pipe in the apparatus was slightly worn by long-term cleaning with the barium sulfate mixture. While microcrystalline cellulose did not see any abrasion.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (10)
1. Application of microcrystalline cellulose in cleaning dry-process laser particle size analyzer.
2. The application of the microcrystalline cellulose in washing materials of a dry-method laser particle size analyzer.
3. Use according to claim 1 or 2, wherein the microcrystalline cellulose has an average particle size of 60 to 250 μm.
4. The solid washing material of the dry-method laser particle size analyzer is characterized by comprising microcrystalline cellulose.
5. The solids wash of claim 4, wherein the solids wash is microcrystalline cellulose.
6. The solid purge of claim 4, wherein the microcrystalline cellulose has an average particle size of 60 to 250 μm.
7. A method for cleaning a dry-process laser particle size analyzer is characterized in that microcrystalline cellulose is placed in the dry-process laser particle size analyzer, and a cleaning program is started for cleaning.
8. The method according to claim 6, wherein the inlet pressure of the washing program is 2-4 bar.
9. The method of claim 7, wherein the purge inlet pressure is 3 bar.
10. The method according to claim 6, wherein the sample injection speed of the cleaning is 30-60%.
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