Sodium Formate Method ning Oxalic Acid
Ing pamaglalang ning oxalic acid kapamilatan ning sodium formate a paralan makadake ya keng lead a paralan ampo ing calcium a paralan. Masipsip ya ing carbon monoxide kapamilatan ning metung a solusyun a sodium hydroxide ba yang mika sodium formate, a kaybat mipapaliari yang dehydrogenate ba yang maging sodium oxalate. Ing tauli magreact ya keng lead sulfate (lead method) o calcium hydroxide (calcium method) para gawang lead oxalate precipitate o calcium oxalate precipitate, na kaybat mi-acidify ya keng sulfuric acid para mika oxalic acid.
Paralan ning tingga para keng pamaglalang oxalic acid: Kaybat ning pamaghugas, pamaghugas alkali, ampo pamaglako alikabuk, ing carbon monoxide mi-compress ya keng 2 MPa kapamilatan ning compressor, mipainit ya keng 150 °C gamit ing 160 g/L sodium hydroxide, at mipadala ya keng reactor para mag-synthesize yang dilute sodium formate solution. Ing solusyun makaconcentrate ya angga keng 600 g/L, peparala ya keng dehydrogenation kettle para mipapalitan ya at mi concentrate ya keng solidu, kaybat mipapainit ya at mitunaw ya, at midehydrogenate ya keng 400 °C. Ing dehydrogenated sodium oxalate isadya de keng suspension, ampo ing lead sulfate iyabe ya lalam ning pamag-stir kabang panatilyan ing pH value keng 3-4. Deng soluble impurities milako la kapamilatan ning pamaghugas, at kaybat ing sobrang sulfuric acid idagdag ya para keng acidification para mika oxalic acid solution. Ing barium carbonate ampo ing 1% polyacrylamide iyabe la para keng coagulation ampo sedimentation para milako la reng impurities. Ing solusyun papalamig ya, mag-crystallize ya, mi-filter ya kapamilatan ning centrifugation, at mipapatuling ya para akwa ing meyari nang produktu.
Paralan ning calcium para keng pamaglalang oxalic acid: Ing makasadyang sodium oxalate suspension ampo ing calcium hydroxide suspension me-quantify la ampo mipadala la keng calciumization reactor para keng calciumization reaction lalam ning pamag-stir. Ing mekwa a likidung calciumization sasalan ya at hugasan ya. Ing filtrate sodium hydroxide makaconcentrate ya at magagamit ya para keng synthesizing sodium formate, ampo ing filter cake calcium oxalate magagamit ya para keng acidification reaction. Ing filter cake makasadya ya keng calcium oxalate suspension, na mi-acidify keng acidification kettle gamit ing sulfuric acid ampo concentrated oxalic acid mother liquor, at kaybat mi-filter ya. Ing filter cake (gypsum) mehugas ya, at ing washing liquid magagamit ya para isadya ing calcium oxalate suspension. Ing filtrate (oxalic acid solution) mi-adsorb ya para milako la reng mapinung calcium sulfate particles, mipapalitan ya, mi-crystallize ya, at mi-centrifuge ya para mikawani ing krudung oxalic acid, na mi-recrystallize ya, mi-separate ya, at mipa-dry ya para mika-qualified a produktu, at ing mother liquor mi-recycle ya.
Ing sodium formate lead method atin yang mature a prosesu, matatag a kalidad ning produktu, ampo makuyad a production cycle, a maki yield a 80%-90% ampo metung a refined oxalic acid purity a 99.5%. Nanupata, atin yang polusyun ing tingga king prosesu ning pamaglalang, at ing sodium sulfate a ikua king reaksiun e malyaring ibalik king prosesu, inya dakal a sulfuric acid ampong caustic soda ing magamit king pamaglalang. Ing paralan ning calcium para keng pamaglalang oxalic acid malyari yang maglako keng polusyun da reng lead salts ampo sodium sulfate keng danum keng gabun, ampo ing pamagpalit keng caustic soda keng apog malyari yang mabawas ing gastus keng pamaglalang. Ing by-product CaSO4 a ibat keng reaksyun malyari yang iprosesu para maging materyales para keng pamaglalang a alang polusyun. At ing pareung panaun, ing mother liquor NaOH a ibat keng reaksyun magagamit ya para magreact keng CO para magsadia keng sodium formate, inya makatipid ya ing dagul da reng raw materials.

Shandong Pulisi Chemical Oxalic Acid: Core Advantages
Ing Shandong Pulisi Chemical's oxalic acid (≥99.6% purity, CAS 144-62-7) makabukud ya kareng ultra-low impurities (sulfate ≤0.1%, heavy metals ≤0.002%, iron ≤0.003%) ampo ISO 900 B, REMI, FAQ, certifications siguraduan ing pamamintu para kareng global a merkadu. Suportan ning 18+ banuang kabiasnan keng chemical, atin kaming factory-direct pricing, full-container logistics a maki bodega keng Qingdao, Tianjin, Shanghai ports, ampo customized packaging (25kg/50kg) para keng seamless exportShandong Pulisi Chemical Group. Ing kekaming oxalic acid masanting ya keng rare earth metal precipitation, metal rust removal, textile dyeing, ampo marble polishing, magdalang consistent a performance ampo sustainable, biodegradable a solusyun para kareng industrial a kliyenti keng mabilug a yatu.