A new optimized laboratory synthesis of tetraalkyl thiuram disulfides,
starting from dialkyl amines and carbon disulfide in presence of three
oxidants (hydrogen peroxide, potassium peroxodisulfate and sodium
hypochlorite) and appropriate reaction medium: two mixtures of isopropyl
alcohol - water used in two consecutive syntheses, was presented in this
work. First synthesis was performed in a recycled azeotropic mixture of
isopropyl alcohol - water 87.7% - 12.3%, and second in a filtrate obtained
after first synthesis, which was a mixture of isopropyl alcohol - water 70.4%
- 29.6%. After the second synthesis and filtration, recycled azeotropic
mixture isopropyl alcohol - water 87.7% - 12.3% was regenerated from the
filtrate by rectification. Considering this, the technology for beneficial
use of recycling isopropyl alcohol - water mixture as reaction medium for
tetraalkyl thiuram disulfides synthesis was developed. Such concept
contributes to extraordinary economical benefit of implemented optimal
laboratory synthesis at semi-industrial level. High yields of tetraalkyl
thiuram disulfides syntheses were obtained at both laboratory and
semiindustrial level. Structure and purity of synthesized compounds were
confirmed by elemental analysis, as well as FTIR, 1H and 13C NMR, and MS
spectral data.
The Solubility of Silver Bromate in Isopropyl Alcohol-Water Mixture