磷酸一铵氢氧化钾生产磷酸二氢钾20140225

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1、磷酸一镂氢氧化钾生产磷酸二氢钾2014022534、反应原理NH4H2P。4115845.59磷酸一镂氢氧化钾生产磷酸二氢钾KOH=KH2P。4+N53+H2O411.761000125132.35561361718各物质在水中溶解度Kg/KgH2O溶解度kg/kgH2O温度CKH2PO4NH4H2PO4K2SO4KOH00.1480.2270.07350.976100.1830.29530.09221.02200.2260.37360.11111.12300.2800.46410.12971.26400.3350.56740.147

2、61.35500.4070.68010.1650600.5010.82480.18171.48700.6050.99200.1975800.7041.18340.2141.62900.7851.4280.2281000.8351.73220.2411.79NH4H2PO4与KOH进行复分解反应，采用蒸发脱氨方法使反应趋于完全34溶解度图;一KOH>KH2PO4K2SO4oznaBOIAgNH4H2P二、NH4H2P。4溶液配制利用浓缩蒸汽冷凝水配制NH4H2P。4溶液，以1000kg结晶为基准，溶液温度为60cNH4H2PO4结晶组成

3、物料名称物料量（kg）分率％干基分率％NH4H2Po4934.793.4798.39(NH4)2HPO41.40.140.15(NH4)2SO412.21.221.29(NH4)2SiF61.30.130.14不溶物杂质0.40.040.04干基工950.095.00100H2O50.05.0034100010060c时NH4H2PO4在水中溶解度为82.48g/100gHO,934.7kgNH4H2PO4需水量为934.7/0.8248=1133.24ks为防止溶液降温有结晶析出，水过量5%,即加入水量为1189.90kg,取水量为

4、1200kg。溶液成分表物料名称物料量(kg)分率％kg/kgHzONH4H2PO4934.742.490.7478(NH4)2HPO41.40.060.0012(NH4)2SO412.20.550.0098(NH4)2SiF61.30.060.0010不溶物杂质0.40.02干基工950.043.18H2O1250.056.82E2200100三、反应物料平衡(以1000kg磷酸一镂结晶为计算基准，配制溶液量为2200kg)主要化学反应NH4H2Po4+KOH=KH2Po4+NH3+H2O115561361718934.7455.1

5、61105.38138.17146.30(NH4)2SO4+2KOH=K2SO4+2NH3+2H2O1322X561742X172X183412.2010.3516.083.143.33(NH4)2SiF6+2KOH=K2SiF6+2NH3+2H2O1782X561.300.822202X172X181.610.250.26(NH4)2HPO4+2KOH1322X56K2HPO4+2NH3+2H2O1742X172X181.401.191.850.360.38总消耗KOH量：455.16+10.35+0.82+1.19=467.52k

6、g总生成NH3量：138.17+3.14+0.25+0.36=141.92kg总生成H2O量:146.30+3.33+0.26+0.38=150.27kg生成KH2PO4量：1105.38kg生成K2SO4量：16.08kg生成K2SiF6量：1.61kg生成K2HPO4量：1.85kg消耗40%KOH量：467.52/40%=1168.80kg,其中水701.28kg物料平衡表反应物生成物磷物料质量物料质量分率％酸NH4H2P。4934.7KH2PO41105.38一(NH4)2HPO41.4K2SO416.08镂(NH4)2SO4

7、12.2K2SiF61.61溶(NH4)2SiF61.3K2HPO41.8534液不溶物杂质0.4NH3141.92干基工950.0不溶物杂质0.40H2O1250.0H2O2101.55E22003368.79碱液KOH467.52H2O701.28E1168.803368.80反应生成物组成物料名称物料量（kg）分率％Kg/kgH2OKH2P。41105.3832.810.5260K2SO416.080.480.0077K2SiF61.610.05K2HPO41.850.05NH3141.924.21不溶物杂质0.400.01工干

8、1267.2437.62H2O2101.5562.383368.79100四、汽提脱氨浓缩浓缩终点的确定浓缩液沸点温度为113C,在地下梢时温度降为10C,输送管路温度降为2C,为安全起见(防止在管路中结晶堵塞管道)，当