sulfur trioxide byproducts: SO2; addn of SO3 drop by drop in glass apparatous 37-43°C without catalyst; addn. of trichloroethylene to remove Br2, removing SO2 by distn., gaschromy pure product;
in melt melting of K2Cr2O7 with KI and some KBr; no formation of Br2;;
参考文献
Koninck, L. L. de
Bulletin des Societes Chimiques Belges, 1903 , vol. 17, p. 157 - 165
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Gmelin Handbook: Cr: MVol.B, 251, page 556 - 558
