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System and method for measuring true density of powder samples under anhydrous and oxygen-free conditions

A water-free and oxygen-free measurement system technology, applied in the direction of measuring devices, specific gravity measurement, instruments, etc., can solve the problems of temperature influence, solvent, gas and other impurities pollution and deterioration, etc.

Active Publication Date: 2011-12-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the defects existing in the prior art, the object of the present invention is to provide a powder sample true density measurement system and measurement method under anhydrous and oxygen-free conditions, which overcomes the powder sample being easily polluted and deteriorated by impurities such as solvents and gases during sample preparation and testing. , and the disadvantage of being affected by temperature, it is suitable for measuring the true density of powder samples, especially for measuring the true density of powder samples that cannot be exposed to air, and can choose to measure the true density of powder samples under non-room temperature conditions

Method used

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  • System and method for measuring true density of powder samples under anhydrous and oxygen-free conditions
  • System and method for measuring true density of powder samples under anhydrous and oxygen-free conditions

Examples

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Effect test

Embodiment 1

[0130] A system for measuring the true density of powder samples at room temperature under anhydrous and oxygen-free conditions, comprising an airtight container 7 and a gas cylinder 1 connected to the airtight container, a vacuum pump 3 , a pressure gauge 5 , a thermometer 6 and a sample bottle 10 .

[0131] Airtight container 7 can be stainless steel container or quartz, glass container, requires good airtightness and ability vacuum, is used for providing standard volume,

[0132]The gas cylinder 1 and the airtight container 7 are connected by a pipeline, and an on-off valve 2 is installed in the pipeline for controlling the feeding of gas into the airtight container.

[0133] The vacuum pump 3 and the airtight container 7 are connected by a pipeline, and a limiting valve 4 is installed in the pipeline to control the pressure drop rate of the airtight system.

[0134] The pressure gauge 5 and the thermometer 6 are directly connected to the airtight container 7 respectively, ...

Embodiment 2

[0139] A system for determining the true density of powder samples under anhydrous and oxygen-free conditions at non-room temperature, comprising a closed container 7 and a gas cylinder 1 connected to the closed container, a vacuum pump 3, a pressure gauge 5, a thermometer 6, a sample bottle 10 and a temperature control Device 12.

[0140] Airtight container 7 can be stainless steel container or quartz, glass container, requires good airtightness and ability vacuum, is used for providing standard volume,

[0141] The gas cylinder 1 and the airtight container 7 are connected by a pipeline, and an on-off valve 2 is installed in the pipeline for controlling the feeding of gas into the airtight container.

[0142] The vacuum pump 3 and the airtight container 7 are connected by a pipeline, and a limiting valve 4 is installed in the pipeline to control the pressure drop rate of the airtight system.

[0143] The pressure gauge 5 and the thermometer 6 are directly connected to the ai...

Embodiment 3

[0150] A method for measuring the true density of Ziegler-Natta catalysts under anhydrous and oxygen-free conditions at room temperature, the method uses the measurement system described in Embodiment 1 of the present invention.

[0151] First weigh the quality m of the empty sample bottle, sealing plug, controllable valve switch and the pipeline between them b , put the sample bottle into the glove box and load Ziegler-Natta catalyst, plug the sealing plug and close the controllable valve switch, take it out from the glove box, weigh the sample bottle, sealing plug and controllable valve switch after loading the catalyst and The mass of the pipeline between them m 2 , connect the sample bottle to the closed system; confirm that the on-off valve 2 and the controllable valve switch 9 are in the closed state, open the vacuum pump 3 and the limit valve 4, until the pressure in the airtight container 7 is less than 50 μmHg, and keep it for 30 minutes; close the limit valve 4, open...

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Abstract

The invention discloses a system and method for measuring the true density of a powder sample in the absence of water and oxygen, relating to the technical field of density measurement of powder samples. The system comprises a closed container, wherein the closed container is respectively connected with a gas cylinder, a vacuum pump, a pressure gauge, a thermometer and a sample bottle through pipelines; a switching valve is arranged on the pipeline between the gas cylinder and the closed container; a limit valve is arranged on the pipeline between the vacuum pipe and the closed container; a seal plug is arranged on the sample bottle; and a controllable valve switch is arranged on the pipeline between the sample bottle and the closed container. According to the system and method for measuring the true density of the powder sample in the absence of water and oxygen, the true volume of the powder sample can be calculated according to the volume variation of the system before and after the sample is loaded, and the true density is obtained through calculation by combining the mass of the powder sample; the system and method disclosed by the invention are suitable for measuring the true density of the powder sample, in particular suitable for measuring the true density of the powder sample which cannot be exposed in the air; in addition, the true density of the powder can be measured under the non-room-temperature condition, and the sample is not in contact with air and water in the whole test process; and the measuring system and method disclosed by the invention have the advantages of strong practicability and convenience for operation.

Description

technical field [0001] The invention relates to the technical field of powder sample density measurement, in particular to a powder sample true density measurement system and a measurement method under anhydrous and oxygen-free conditions. Background technique [0002] True density is one of the basic characteristics of powder, which refers to the ratio of powder weight to true volume, and its true volume does not include the closed space existing inside the powder particles. [0003] At present, the methods for measuring the density of powder samples are mainly liquid immersion method and gas volume method. The liquid immersion method is to immerse the powder sample into the immersion liquid on the surface of the easily wettable powder particles, vacuum degassing to completely eliminate the air bubbles, and then measure the density of the powder sample. Excluding the volume of liquid, this method is not suitable for powder samples that are easily soluble or contain easily s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N9/02
Inventor 满毅黄文氢
Owner CHINA PETROLEUM & CHEM CORP
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