Ndlela yo Hlanganisa Khaboni Monokisayidi ya Oxalic Acid
Ndlela leyi ekusunguleni ayi tirhisa palladium na copper salts tani hi ti catalysts, naswona yi endle liquid-phase coupling reaction ya carbon monoxide, oxygen, byala, na dilute nitric acid eka 8–11 MPa na 90–100 °C. Ku cinca loku kusungula ku humesa oxalate ester, leyi endzhaku yi endliwaka hi hydrolyzed ehansi ka swiyimo swo hisa kuva yi endla oxalic acid na byala lebyi fambelanaka.
Ndlela leyi yina sisiteme yin’we ya catalyst, ntirho wale henhla, ku hlawula kahle, ku vuyisa hiku olova, ku basa ka swihumelerisiwa swale henhla, xikan’we naku thyakisa ka vuhumelerisi byale hansi. Hambiswiritano, yi ni swilaveko swa le henhla swa ku basa ka khaboni-monokisayidi, ku tirhisiwa lokukulu, swihlohloteri leswi durhaka ni vuvekisi lebyikulu.
Hiku tirhisa Pd/C tani hi catalyst, carbon monoxide na nitrite ester swihlanganisiwa kuva swi endla oxalate ester eka 130 °C na ntshikelelo wa xibakabaka, na nitric oxide tani hi by-product. Oxalic acid na byala lebyi fambelanaka na swona swikumeka hiku hydrolyzing oxalate ester. Nkatsakanyo wa byala lowu hambanisiweke wu tlhela wu oxidized kuva wu endla nitrite ester, leyi nga tlheriseriwaka endzhaku.
Fujian Institute of Structure of Matter, Chinese Academy of Sciences, yi endlile ndzavisiso eka ratio ya switirhisiwa swoka swinga tirhisiwanga na swiyimo swohambana hambana swa rivilo ra xibakabaka eka catalytic synthesis ya dimethyl oxalate eka ndzavisiso wa ti catalysts ta atmospheric pressure catalytic coupling ya CO kuya eka oxalic acid, naswona yi hlawurile swiyimo leswi faneleke swa reaction. Catalyst ya Pd (2.0%)/α-Al2O3 leyi antswisiweke yifikelerile mbuyelo wa space-time wa 999 g/L·h ehansi ka swiyimo swa ntshikelelo wa xibakabaka, 140 °C, CO/CH3ONO=1.5, na rivilo ra xibakabaka ra 3000/h. Nhlangano lowu wu tirhisanile na Fujian Petrochemical Design Institute na Fujian Nanqing Ammonia Plant ku endla xikambelo xo ringeta xa 100 t/a xo vuyisa CO kusuka eka ku hlantswa koporo ya ammonia yo endliwa, ku endliwa ka catalytic ya ntshikelelo wa xibakabaka ya dimethyl oxalate, na hydrolysis kuya eka oxalic acid.
Loko ku pimanyisiwa na ndlela ya liquid-phase, ndlela leyi yina ku hlawula lokukulu, endlelo ro olova, ku basa lokukulu ka swihumelerisiwa, xikan’we na ntsengo wale hansi wa vuhumelerisi. Yinga tirhisa gasi ya ntumbuluko kumbe malahla tani hi switirhisiwa swoka swinga tirhisiwanga, naswona yinga tlhela yi tirhisa carbon monoxide leyi kumiweke kusuka eka ammonia copper scrubbing kumbe yellow phosphorus furnace, blast furnace, na converter tail gas tani hi xihlovo xa gasi ya carbon monoxide. Hi nkarhi walowo, yinga nyika switirhisiwa swo chipa swa raw materials eka vuhumelerisi bya ethylene glycol xikan’we naku hlanganisiwa ka oxalate ester tani hi intermediate.

Shandong Pulisi Tikhemikhali Co., Ltd. | Muphakeri wa Oxalic Acid wa Xiyimo xa le Henhla
Yi simekiwile hi 2006, Pulisi Chemical yi tiveka ngopfu eka high-purity oxalic acid (CAS 144-62-7) leyi landzelaka swipimelo swa matiko ya misava swa ku xaviseriwa matiko yale handle eka tigiredi ta tiindasitiri na leti antswisiweke. Ndhawu ya hina ya vumaki leyi simekiweke eZibo yi tiyisisa vulawuri byo tika bya khwalithi, na oxalic acid ya giredi ya tiindasitiri leyi tibumaka hi vutengi bya le hansi bya 96% na giredi leyi antswisiweke leyi fikelelaka ku basa ka 99.6%—yi fikelela swilaveko swo hambana swa tiindasitiri.
Oxalic acid ya hina yi humelela hi ku n’oka ka yona lokunene na swivumbeko swa tikhemikhali leswi tiyeke, yi tirha tanihi xitirhisiwa xo ka xi nga tirhisiwanga eka tisekithara hinkwato. Eka ku lulamisiwa ka nsimbi, yi susa kahle rust na ti surface oxide layers eka nsimbi, aluminium na copper, leswi antswisaka ku namarhela ka coating eka switirhisiwa swa mimovha, swa swihahampfhuka na electroplating. Eka swiambalo, yitirha tani hi eco-friendly bleaching agent xikan’we na dye fixative, leswi antswisaka ku tiya ka muhlovo wa malapi xikan’we naku vonakala.
Ku engetela kwalaho, yi tirhisiwa ngopfu eka ku endliwa ka mirhi, ku lulamisa tihunyi, ku humesiwa ka nsimbi leyi nga tolovelekangiki ni ku basisiwa hi xikalo xa mati. Hi tiyisisiwile hi ISO 9001 na EU REACH, hi phakela swipaci swa 25kg leswi ringaniseriweke eka tioda ta xitalo, ku tiyisisa mphakelo wa misava hinkwayo lowu tshembekaka. Kungava eka vuhumelerisi bya ti indasitiri bya xiyimo xale henhla kumbe switirhisiwa swa xiyimo xale henhla, Pulisi Chemical yi tisa khwalithi leyi nga cincekiki na nseketelo wa xiphurofexinali.