By Mellor J.W.

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Chlorine Still. bausted still liquor contains manganous chloride, and some ferric and other metal chlorides derived from impurities in the manganese ore. g. 3 per cent. 6 It will be observed that even under the ideally perfect conditions represented by only half the chlorine of the the equation, Mn0,+4HC1=MnCl2+2H20+C1,, acid can be obtained in the free state. The hydrochloric acid consumed by the impurities in the manganese ore ; by forms of manganese oxides with a lower power of oxidation than the dioxide ; and the excess hydrochloric acid which escapes oxidation all tend to reduce the efficiency of the process.

The enormous quantities of calciuni chloride produced in the ammonia-soda process has attracted inventors who have made verypersistent eff orts t o separate the chlorine by a cheap process. Thus, E. Solvay 35 had a series of about twenty patents between 1877 and 1888 directed to the decomposition of the chloride by heating a mixture with sand or clay in a stream of VOL. 11. D 34 INORGANIC AND THEORETICAL CHEMISTRY air. F. Hurtur has shown that the great amount of thermal energy required for the decomposition of sodium and calcium chlorides by chemical process makes i t .

Probable that it would be really cheaper to decompose these chlorides by sulphuric acid than by Solvay's process. I n an attempt to recover the chlorine from the stillliquor in the manufacture of chlorine from manganese dioxide and hydrochloric acid, W. Weldon 36 mixed the acid liquid with magnesite and heated the dried residue ; although the process was not successful industrially, he got the idea 37 that chlorine could be obtained from hydrochloric acid by converting the latter into magnesium chloride : MgO+2HCl=MgC12+H20 ; and then heating the magnesium chloride in a stream of air : 2MgCl2+O2=2MgO+2Cl2.

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A Comprehensive Treatise Inorganic and Theoretical Chemistry by Mellor J.W.


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