General method for determination of freezing point and crystallizing point of dye intermediates
The standard specifies a general method for the determination of the freezing and crystallizing points of dye intermediates using double sleeves.
The standard is suitable for the determination of the freezing point and crystallization point of dyestuff intermediates at the temperature of -10~150
Crystal:
The freezing point and crystallization point of a substance refer to the phase transition temperature of the liquid in the cooling process from liquid to solid state
Principle: The liquid or the melted substance cools down under the atmospheric pressure, when the temperature is controlled, the heat is released during the phase transition process from the liquid phase to the solid phase, and the temperature maintained by the highest temperature is the freezing point and the crystallization point at a certain stage.
For example: polyethylene glycol acetic acid acetone, isopropanol, benzene, phenol, stearic acid, bisphenol A freezing point and crystallization point determination
Instruments and devices:
A set of test tubes for freezing point
ST203B Automatic freezing point instrument one
Power supply: AC220V±10%; 50 hz.
Working cold bath: double vacuum bath.
Temperature control:
Temperature control accuracy: ±0.1℃.
Bath mixing: automatic mixing by mixing motor, power 6W, 1200r/min.
Results output: at the same time can be equipped with U disk output function, output to the computer for long-term preservation
Output format: The output format of the usb flash drive is CSV or Excel.
Data tracking: can connect to limisi system
Remote upgrade: With the TCP network transmission function, the software can be upgraded remotely later