Njira ya Sodium Formate ya Oxalic Acid
Kupanga kwa oxalic acid pogwiritsa ntchito njira ya sodium formate kumagawidwa m'magulu awiri: njira ya lead ndi njira ya calcium. Carbon monoxide imatengedwa ndi yankho la sodium hydroxide kuti ipange sodium formate, yomwe kenako imachotsedwa mu hydrogen kuti ipange sodium oxalate. Yotsirizirayi imayanjana ndi lead sulfate (njira ya lead) kapena calcium hydroxide (njira ya calcium) kuti ipange lead oxalate precipitate kapena calcium oxalate precipitate, yomwe kenako imaphatikizidwa ndi sulfuric acid kuti ipange oxalic acid.
Njira yopangira asidi wa oxalic: Pambuyo potsuka, kutsuka ndi alkali, ndi kuchotsa fumbi, carbon monoxide imapanikizidwa kufika pa 2 MPa ndi compressor, kenako imatenthedwa mpaka 150 °C ndi 160 g/L sodium hydroxide, ndikutumizidwa ku reactor kuti ipange yankho la sodium formate losungunuka. Yankho limayikidwa pa 600 g/L, ndikutumizidwa ku ketulo yochotsera madzi kuti itenthedwe ndikuyikidwa mu cholimba, kenako imatenthedwa ndikusungunuka, ndikuchotsedwa madzi pa 400 °C. Sodium oxalate yochotsera madzi imakonzedwa ngati suspension, ndipo lead sulfate imawonjezedwa pansi pa kusonkhezera pamene pH ikusungidwa pa 3-4. Zonyansa zosungunuka zimachotsedwa potsuka, kenako sulfuric acid yochulukirapo imawonjezedwa kuti ipange acidization kuti ipeze yankho la oxalic acid. Barium carbonate ndi 1% polyacrylamide zimawonjezedwa kuti ziume ndi sedimentation kuti zichotse zonyansa. Yankho limaziziritsidwa, limapangidwa kukhala crystallized, limasefedwa ndi centrifugation, ndikuumitsidwa kuti lipeze chinthu chomalizidwa.
Njira ya calcium yopangira oxalic acid: Chotsukira cha sodium oxalate chokonzedwa ndi chotsukira cha calcium hydroxide zimayesedwa ndikutumizidwa ku calciumization reactor kuti chikhale ndi calciumization reaction pansi pa kusakaniza. Madzi a calciumization omwe apezeka amasefedwa ndikutsukidwa. Filtrate sodium hydroxide imayikidwa mu sodium formate, ndipo calcium oxalate yokonzedwa mu fyuluta imagwiritsidwa ntchito pa acidification reaction. Fyuluta ya keke imakonzedwa mu calcium oxalate suspension, yomwe imayikidwa mu ketulo ya acidification yokhala ndi sulfuric acid ndi oxalic acid mother liquor yokhazikika, kenako imasefedwa. Fyuluta ya keke (gypsum) imatsukidwa, ndipo madzi otsukira amagwiritsidwa ntchito kukonzekera calcium oxalate suspension. Filtrate (oxalic acid solution) imachotsedwa kuti ichotse tinthu tating'onoting'ono ta calcium sulfate, kuziziritsidwa, kupangidwa makristalo, ndikuyikidwa mu centrifuge kuti ilekanitse oxalic acid yopanda mafuta, yomwe imabwezeretsedwanso, kulekanitsidwa, ndikuumitsidwa kuti ipeze chinthu choyenera, ndipo mowa wa mayi umabwezeretsedwanso.
Njira ya sodium formate lead ili ndi njira yokhwima, khalidwe lokhazikika la zinthu, komanso nthawi yochepa yopangira, yokhala ndi zokolola za 80%–90% komanso kuyera kwa oxalic acid koyengedwa kwa 99.5%. Komabe, pali kuipitsidwa kwa lead mu njira yopangira, ndipo sodium sulfate yomwe imapezeka kuchokera ku reaction siyingabwezeretsedwe ku ndondomekoyi, kotero kuchuluka kwa sulfuric acid ndi caustic soda zimagwiritsidwa ntchito popanga. Njira ya calcium yopangira oxalic acid imatha kuchotsa kuipitsidwa kwa mchere wa lead ndi sodium sulfate kupita kumadzi apansi panthaka, ndipo kusintha caustic soda ndi laimu kungachepetse kwambiri ndalama zopangira. CaSO4 yomwe imapezeka kuchokera ku reaction ikhoza kusinthidwa kukhala zipangizo zomangira popanda kuipitsidwa. Nthawi yomweyo, mowa wa mayi NaOH womwe umapezeka kuchokera ku reaction umagwiritsidwa ntchito kuchitapo kanthu ndi CO kukonzekera sodium formate, potero kusunga kuchuluka kwa zipangizo zopangira.

Shandong Pulisi Chemical Oxalic Acid: Ubwino Waukulu
Oxalic acid ya Shandong Pulisi Chemical (≥99.6% kuyera, CAS 144-62-7) imadziwika bwino ndi zinthu zodetsedwa zochepa kwambiri (sulfate ≤0.1%, zitsulo zolemera ≤0.002%, chitsulo ≤0.003%) ndi ziphaso za ISO 9001, BV, REACH, FAMI-QS, zomwe zimatsimikizira kuti misika yapadziko lonse ikutsatira malamulo. Mothandizidwa ndi zaka zoposa 18 zaukadaulo wa mankhwala, timapereka mitengo yolunjika ku fakitale, zinthu zonse zodzaza ndi ziwiya m'malo osungiramo katundu ku Qingdao, Tianjin, Shanghai, komanso ma phukusi okonzedwa (25kg/50kg) kuti atumize kunja mosavuta ku Shandong Pulisi Chemical Group. Oxalic acid yathu imagwira ntchito bwino kwambiri pakuchotsa zitsulo za rare earth, kuchotsa dzimbiri lachitsulo, kuyika utoto wa nsalu, ndi kupukuta miyala ya marble, kupereka magwiridwe antchito okhazikika komanso mayankho okhazikika komanso osinthika kwa makasitomala amafakitale padziko lonse lapansi.