What is the boiling range required in the national standard GB338 for methanol?
Industrial methanol is a colorless, transparent, volatile, pungent and flammable toxic liquid at room temperature. Industrial methanol is widely used. In addition to being a good solvent for many organic substances, it is mainly used in the industrial production of synthetic fibers, formaldehyde, plastics, pharmaceuticals, pesticides, dyes, synthetic proteins and so on. It is a basic organic chemical raw material.
According to the standard requirements, the boiling range of methanol is 64.4 ℃ -65.5 ℃
The boiling range of methanol is detected by gb/t7534 standard method. The automatic boiling range tester sh6536 adopts color LCD screen, Chinese menu, man-machine dialogue, guided operation, and the measurement process is fully automated. It conforms to the national standard gb/t7534-2004 determination method of boiling range of volatile organic liquids for industrial use.
It adopts embedded computer, imported industrial computer, large screen LCD touch screen, friendly man-machine dialogue interface and convenient test operation. Using single chip microcomputer and intelligent control technology, the heating and cooling of distillation test process, the liquid level tracking of distillate, the distillation rate control, the volume control of recovered liquid, the temperature recording, the printing of test results, etc. are all completed automatically.
The chemical properties of industrial methanol are relatively active, and chemical reactions such as oxidation, esterification and carbonylation can occur. Methanol is not acidic. Although its molecular composition has hydroxyl groups that can be used as alkaline characteristics, it is not alkaline, and is neutral to phenolphthalein and litmus.