in water neutralization of crude H3PO4 with Na2CO3 at 35 or 70°C in presence of BaCO3, FeSO4 and activated coal;; product-mixture, diphosphate:monophosphate=1.67:1 at 70 °C without preceding filtration, ratio 1.05:1 at 35 °C;;
参考文献
Gmelin Handbook: Na: SVol.1, 90, page 346 - 348
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Union Chimique Belge S. A.
Patent: BE580527 , 1960 ;
C. A., 1960 , p. 11407
in neat (no solvent) byproducts: SO2; react. of 1 mol red P with up to 5 mol Na2SO4 in presence of H3PO4 at 300-335°C until development of SO2 ceases;; mixture obtained;;
参考文献
Gmelin Handbook: Na: SVol.1, 90, page 346 - 348
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Monsanto Chemical Co.
Patent: US2726143 , 1955 ;
C. A., 1956 , p. 4469
in water byproducts: CaSO4*2H2O; addn. of Na2SO4 to a soln. containing H3PO4 and Ca(H2PO4)2 (ratio=80:20 to 75:25), pptn. of CaSO4, addn. of NaOH to the filtrate until pH of 4.4has been achieved, crystn. of NaH2PO4;;
参考文献
Gmelin Handbook: Na: SVol.1, 88, page 341 - 344
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Warner Chemical Co.
Patent: US1961127 , 1934 ;
C. II, 1934 , p. 1973
formation as by-products on activation of charcoal in presence of Na-salts and H3PO4;; product mixture;;
参考文献
Gmelin Handbook: Na: SVol.1, 94, page 354 - 357
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Metallgesellschaft A.-G.
Patent: US1918355 , 1933 ;
C. II, 1933 , p. 2439
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Metallgesellschaft A.-G.
Patent: DE580125 , 1934 ;
C. A., 1934 , p. 2474
