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21560HEBEIJOURNALOFINDUSTRIALVol.21No.5P.60872004SCIENCE&TECHNOLOGYSum872004:100821534(2004)05200602031,2,3(11,050018;21,050018;31,050011):,95%,,KH2PO4,w(KH2PO4)98%,w(Cl-)012%,,KH2PO492%98%,:;;;:TQ13111+3:A,,,[1],,,,,,,,1,,,,2:2003210212;:2004203209::(19652),,,,,2060,,,1,,,,[2],,3,[3]H++H2O+2eH2+OH-,OH-+H3PO4H2PO-4+H2O,,,,,4,1),©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.1KH2PO4Fig.1ThetechnologicalprocessflowchartofpreparationofKH2PO4withapatiteandpotassiumchloride,,[4]:H3PO4+M=[MH]H2PO4(M),[MH]H2PO4+KCl=[MH]Cl+KH2PO4,[MH]Cl+NH3=M+NH4Cl2),,[5],,,KOH,pH=45,,,,w()96%,K+K2SO4KOH,[6],,85%,,,,,w(KH2PO4)96%,w(Cl-)012%,95%,95%,,KOH[7],9915%,3),,,[8]22(241),,,95%,99%,w(Cl-)0.2%,,,,,,,,,,,5(:001#D301)H2PO4-1K+KH2PO[911]4,(1t15m3),,,,,6[1214],(KH2PO492%94%)71)165©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,Na2CO3+2H3PO4=2NaH2PO4+CO2+H2O,NaH2PO4+KCl=KH2PO4+NaCl,,,NaCl,2),:NH4H2PO4+KCl=KH2PO4+NH4Cl,NH4HCO3+H3PO4+KCl=KH2PO4+NH4Cl+CO2+H2O,,,,8[15]2Fig.2ThetechnologicalprocessflowchartofpreparationofKH2PO4withammoniumbicarbornate,pomuriateofpotashandphosphoricacid,9H3PO4+KCl=KH2PO4+HClKClH3PO4,HCl,H3PO42KH2PO42KCl2H2OKH2PO4H3PO4KH2PO4,,,KCl,,,HCl115m3,17001080109MPa,KCl95%,w(KH2PO4)98%,012%,(:w(Cl-)012%),,:HCl,,,,,,HCl,KCl95%,w(KH2PO4)98%,w(Cl-)012%,,HClw(HCl)30%,,,(6h),,,1600,,:[1],1[J].,2001,10(2):39241.[2]1[J].,2001,16(4):33235.[3]1[J].,2001,18(6):4212426.[4],1[J].,2001,28(1):14216.()2621©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.(62)[5]1[J].,1985,(5):6211.[6],1[J].,1996,(12):627.[7],,1[J].,1982,(1):227.[8],,,1[J].IM&P,2001,(11):527.[9]1[J].,1982,(2):25228.[10]1[J].,1990,(6):30233.[11],1[J].,1984,(2):9212.[12],[J].,1983,(5):24226.[13]1P,K,F[J].,1984,(9):629.[14],1P,K,F[J].,1985,(10):23227.[15],,,1[J].,2001,16(4):12213.TechnologiesforPreparationofPotassiumDihydrogenPhosphateSHILan2xiang1,CHENXiang2min2,ZHANGBao2hua3(1.CollegeofChemicalandPharmaceuticalEngineering,HebeiUniversityofScienceandTechnology,ShijiazhuangHebei050018China;21GraduteSchool,HebeiUniversityofScienceandTechnology,ShijiazhuangHebei050018China;3.ShijiazhuangCopperandAluminumProd2uctsFactory,ShijiazhuangHebei050011,China)Abstract:Thepaperreviewsthepreparationofpotassiumdihydrogenphosphate.Boththemethodfromhydro2phosphoricacidandpotassiumchlorideandthemethodfromammoniumbicarbonate,hydro2phosphoricacidandpotassiumchlorideareconsideredtobemorebeneficialinin2dustry.Thematerialswhichthesemethodsuseareeasilyobtainedandtheoperationissimple.Nowastesoccurduringoperationandtheby2productsareallrecoverable.Theyieldrateofproductisover95%andthecostoftheproductislowerthanothers.Thefirstmethodrequiresaspecialequipmenttoavoiderosionandtoexpelhydrochloridesmoothly.Thecontentoftheproductobtainedisover98%andtheCl-lessthan0.2%.Thesecondmethodisofthefeaturesofsimpleequipmentandsmallcost,butthecontentofitsproductcanonlybeupto92%-98%.Keywords:potassiumdihydrogenphosphate;phosphoricacid;potassiumchloride;preparation:©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.