Dry the organic with over anhydrous sodium sulfate
overnight, filtered again, evaporated to dryness the filtrate and silica gel column chromatography (silica gel, 200-300 mesh; eluent, petroleum ether) to get a white solid powder 0.421 g, yield 80.9%.
Supply of 250 tons anhydrous sodium sulfate
for the industrial detergents' line.
In turn, the mixture is filtered, the silica washed several times with anhydrous ether, and the extracts combined and dried over anhydrous sodium sulfate
. The ether is removed under vacuum to yield pure chiral amines.
Activated silica gel (17 g) soaked in dichloromethane was loaded into the clean-up column (5 cm), which was then topped up with 1.5 cm of anhydrous sodium sulfate
. Dichloromethane (5 ml) was added to wash the sodium sulfate and the silica gel.
Separate the organic layer; add about 500mg of anhydrous sodium sulfate
shake well, filter and inject.
The pooled ether was concentrated under vacuum and passed through anhydrous sodium sulfate
to remove any residual water.
After four or five hours of the refluxing, the mixture was cooled to room temperature and was dried by anhydrous sodium sulfate
. Methanol was distillated, and a pale yellow oily liquid was left, then the dimethyl adipate was obtained by vacuum distillation.
Three tenders for the import of (a) 1,090 tons refining dust, (b) 3,800 tons anhydrous sodium sulfate
& (c) 75 tons CMC.
ANHYDROUS SODIUM SULFATE
, Vidushi Gupta *, Zach Capland and