1 Subject Content and Scope of Application
This standard specifies the determination method of distillation yield of crude glycerol raw materials.
2 Reference standard
3 Principle
Collection of glycerol vaporization products in a certain temperature range in the laboratory by negative pressure method.
4 Reagent
5 Instrument
5.1 flask with three necks: 2000 ml, with grinding glass interface.
5.2 Condenser: Water-cooled, with grinding glass joints to match conical flasks.
5.3 Heating jacket 2000ml, supporting heating to 230 degrees
5.4 Multipurpose Vacuum Pump for Laboratory Circulating Water
6 Sample preparation
Take crude glycerol mixture sample
7 Test procedure
About 450g (Weighing accurately to 1g) of crude glycerol mixed evenly were weighed in flask with three necks, and some glass beads were added to the flasks to resist explosion and boiling. The glass beads were heated with a heating jacket. Under vacuum-0.095 Mpa, the dehydration and dehydration were carried out first, and the distillates at 180-220 degrees C were collected as the yield calculation. Replace the conical bottle in the middle.
8 Calculation of test results
The formula for calculating the distillation yield of glycerol is as follows.
| X | = | M1 | ×100 …………………（3） |
| M2 |
M1………180-220℃ sample collection, g
M2……… Sample weight
