Low-temperature liquid medium

A low-temperature liquid and medium technology, applied in the field of low temperature, can solve the problems of easy volatilization, high viscosity, too large, etc., and achieve the effect of low boiling point and low volatilization under normal pressure

Active Publication Date: 2018-02-23
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although methane, ethane, propane, butane, R124, R22, R32 and other substances have a very low triple point, they can exist in liquid form at -150°C or even -180°C. Volatile; methanol, ethanol, propanol and other commonly used constant temperature bath media have high boiling points and are not easy to volatilize, but limited by the triple point, the viscosity is extremely high at around -110°C, which is difficult and cannot guarantee the uniform temperature requirements of the constant temperature bath
Therefore, although there is a wide range of constant temperature requirements (such as temperature calibration) for the temperature range of -110°C and below, due to the lack of liquid media, there are still no related products on the market

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1 is applicable to a kind of liquid medium of -140 ℃

[0043] see figure 1 , is a schematic diagram of realizing the eutectic temperature of the low temperature medium provided in Example 1 of the present invention. In this embodiment, the cryogenic medium adopts a binary mixture in an alkane composition, mixing ethylcyclopentane and isohexane in a certain proportion, when the proportion of ethylcyclopentane does not exceed 50% (molar ratio) , the mixture of the two can achieve a solid-liquid phase transition temperature lower than their respective triple points, so it can be used as a liquid medium in a lower temperature region, especially when the molar ratio of ethylcyclopentane to isohexane is 0.314:0.686 Optimum, the eutectic temperature of the lowest temperature -160.1°C can be realized, and at this optimal ratio, the liquid medium requirement of -140°C can be met.

Embodiment 2

[0044] Embodiment 2 is applicable to a kind of liquid medium of -150 ℃

[0045] see figure 2 , is a schematic diagram of realizing the eutectic temperature of the low temperature medium provided in Example 2 of the present invention. , in this embodiment, the cryogenic medium uses a binary mixture of an alkane composition and an olefin composition, and isohexane and 4-methyl-1-pentene are mixed in a certain proportion, almost in any proportion, the two The mixture can realize the solid-liquid phase transition temperature lower than their respective triple points, so it can be used as a liquid medium in a lower temperature region, especially when the molar ratio of isohexane to 4-methyl-1-pentene is 0.418:0.582 It is optimal at the time, and the eutectic temperature with the lowest temperature of -169.3°C can be achieved. Under this optimal ratio, it can meet the requirements of liquid medium at -150°C.

Embodiment 3

[0046] Embodiment 3 is applicable to a kind of liquid medium of -150 ℃

[0047] see image 3 , is a schematic diagram of realizing the eutectic temperature of the low temperature medium provided in Example 3 of the present invention. In this example, the low-temperature medium uses a binary mixture of olefinic compositions, mixing 4-methyl-1-pentene and 2,3-dimethyl-1-butene in a certain proportion, almost at any ratio, the mixture of the two can achieve a solid-liquid phase transition temperature lower than their respective triple points, so it can be used as a liquid medium in a lower temperature region, especially, between 4-methyl-1-pentene and 2,3 - The optimum molar ratio of dimethyl-1-butene is 0.529:0.471, which can achieve the lowest eutectic temperature of -171.7°C. Under this optimal ratio, it can meet the requirements of liquid medium at -150°C.

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Abstract

The invention provides a low-temperature liquid medium. The low-temperature liquid medium comprises at least one of an alkane type composition, an olefin type composition, an alcohol type compositionand an ether type composition, wherein the alkane type composition, the olefin type composition, the alcohol type composition and the ether type composition respectively comprise corresponding substances which have the melting point lower than -110 DEG C and the standard boiling point higher than 50 DEG C and are non-toxic and harmless. As the low-temperature liquid medium is composed of single substances or a binary, ternary and multielement mixture thereof which have the melting point lower than -110 DEG C and the standard boiling point higher than 50 DEG C and are non-toxic and harmless, anatmospheric boiling point of the low-temperature liquid medium is low, the low-temperature liquid medium is difficult to volatilize, and a specific mixture can be utilized for realizing a liquid requirement at a low temperature, especially at the temperature lower than -110 DEG C, in an eutectic way.

Description

technical field [0001] The invention relates to the field of low temperature technology, in particular to a low temperature liquid medium. Background technique [0002] The constant temperature liquid bath is widely used in the fields of petroleum, chemical industry, electronic instrumentation, physics, chemistry, bioengineering, medicine and health, life science, light industry food, physical property testing and chemical analysis, etc., providing a field with controlled heat and cold, uniform and constant temperature It can also be used as a heat source or cold source for direct heating or cooling and auxiliary heating or cooling. Due to the high density and high heat capacity of liquid, it is easier to achieve higher constant temperature accuracy than air or other gas baths, and it is less susceptible to environmental interference, so constant temperature liquid baths are more widely used than gas baths. [0003] Patent ZL96244411.1, patent CN201320651525.2, patent CN200...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/10
CPCC09K5/10C09K5/04C09K5/066
Inventor 公茂琼赵延兴董学强
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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