High purity chlorine - for org syntheses with minimal side reactions

摘要

The raw gaseous material contg. =0.001 wt.% non-volatile impurities esp. FeCl3 is contacted with an adsorbent of silica gel, glass wool, pumice or montmorillonite, or is treated with H2SO4. Specif. in the adsorption treatment, a second treatment is effected using hexachlorobutadiene or perfluorinated paraffins. The acid used is 70-100, pref. 98%. Materials contg. as low as 0.2 x 10-5 wt.% FeCl3 can be treated, and when subsequently used in org. reactions, show minimal side reactions e.g. condensations which lower the yield and give discoloured prodts.