in not given stepwise heating at 80 - 100°C and 150 - 180°C or 250°C; reaction take place in presence of water, alkali sulfates, NaOH, Na2CO3, CaO or S; stepwise addn. of educts;;
in not given stepwise heating at 80 - 100°C and 150 - 180°C or 250°C; reaction take place in presence of water, alkali sulfates, NaOH, Na2CO3, CaO or S; stepwise addn. of educts;;
in not given stepwise heating at 80 - 100°C and 150 - 180°C or 250°C; reaction take place in presence of water, alkali sulfates, NaOH, Na2CO3, CaO or S; stepwise addn. of educts;;
sodium carbonate in water soln. from wet gas purification treated with 50percent CaCl2-soln. and heated at 110 - 120°C; filtration of soln. and treatment of impurities with Ca(OH)2; filtration and concn.; removing of NaCl; treatment with Ca(ClO)2 at 90 - 100°C;; filtrate concg.; pure product;;
