e,whichwasnotonlypollutedtheenvironment,butalsowastedalotofresources.Inviewofthissitumion,weconductedtheresearchOntheresidua,notonlytoreducethepollutionoftheenvironment,buttogetgreatereconomicbenefits.Thereasonabletechnologicalconditionsandtechnicalparameterstoseparatethe3-Biphenylcarboxylicacidand4-Biphenylcarboxylicacidbycrystalllizationmethodsbystepswereconfirmed:A.anicsolvents;B.thebestratioofrawmaterials;C.reasonableactiontemperatureandtime.Theproductivityof3-Biphenylcarboxylicacidisover70%andthequalityscoreismorethan98%:theproductivityof4-Biphenylcarboxylicacidis70%andthequalityscoreismorethan98%:boththeproductpufi够Canbeinlinewiththestandardofindustry.Basedonaboveexperimentalresult,wefinished3000Lpilot-scaletestatgoodresultwithHebeiJiuXUindustrialgroupCo.LTD,onditionparametersfor万方数据