| 摘要 |
1370258 NH3 and SO2 from sulphates INSTITUT FRANCAIS DU PETROLE DES CARBURANTS ET LUBRIFIANTS 23 May 1972 [27 May 1971] 24225/72 Heading C1A NH3 and SO2 are prepared by heating (NH<4>)2SO4 and/or NH4HSO4 with at least ¢ mole of (NH4)2S2O3 at a temp. of 150-400‹ C. The reaction mixture may contain up to 10 times the minimum quantity of thiosulphate. The reaction mixture may be an ammonical liquor obtained by washing SO2 and SO3 off gases with NH3, (NH4)2CO3 or aq. NH4SO3, or a mixture of (NH4)2SO4 and NH4HSO4 in the form of a melt which may contain 30-50% by wt. NH4HSO4, obtained evaporating the liquor. The salts may also be reacted in a fluidized solution containing an alkali metal salt, Al2O3, or SiO2-Al2O3. The reaction mixture may be heated using a combustible gas, e.g. CO, H2 or C1-C4 hydrocarbon. |
