Glass instrument for determining the crystallization point of liquid/solid samples

Glass instrument for determining the crystallization point of liquid/solid samplesThis standard refers to the international standard ISO 1392-1977 "General Method for Determination of Crystallization Point".

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Topic Content and Scope of Application

This standard specifies the method for determining the crystallization point of organic chemical products.

This standard is applicable to organic chemical products with crystallization points ranging from -10 to 150C.

2. Method Summary

Liquid or melted organic chemical products are cooled at atmospheric pressure. During the phase transition from liquid phase to crystallization, the highest temperature observed in the constant stage is the crystallization point due to the release of latent heat.

3 reagents

Unless otherwise specified, analytical grade reagents shall be used for the reagents used in this standard.

3.1 Desiccant

3.1.1 Anhydrous calcium sulfate

3.1.2 Anhydrous calcium chloride.

3.1.3 *

31.4 5A molecules, need to pass through the fabric before use

3.2 Heat transfer medium

321 mixture of phosphate ice and salt, suitable for

4 32.2 A mixture of crushed ice and water or water, suitable for

3.2.3 Glycerol: Suitable for temperatures ranging from room temperature to 150 ℃

Glass instrument for determining the crystallization point of liquid/solid samplesGeneral laboratory instruments

4.1 Main thermometer: glass rod mercury thermometer, with a scale of 0.1At ℃, the distance between the bubbles in the mercury ball jade should not exceed 5MM, and it should be fully immersed and calibrated.4.2 Auxiliary thermometer: glass rod mercury thermometer, range 0-100

℃, scale 1

℃

4.3 Crystallization tube: made of glass, outer diameter 25mm, wall thickness 2MM, length 150MM

4.4 Protective cover: made of glass, with an inner diameter of 28mm or 38mm, a wall thickness of 2MM, and a length of 120mm.