Kugwiritsa Ntchito Oxalic Acid Posindikiza ndi Kupaka Nsalu

Ntchito za Oxalic Acid
Mu makampani opanga mankhwala, oxalic acid imagwiritsidwa ntchito popanga pentaerythritol, cobalt oxalate, nickel oxalate, basic fuchsin, zida zonse zoyeretsera zitsulo ndi nthaka, zinthu zoyeretsera mankhwala, ndi zinthu zina.
Mu njira zopaka utoto mwachangu, imagwira ntchito ngati chothandizira kupanga utoto komanso kulinganiza.
Imagwira ntchito ngati chotsukira udzu ndi tirigu zomwe zimapangidwa ndi udzu (zimagwiritsa ntchito mphamvu zochepetsera oxalic acid) komanso ngati chochotsera dzimbiri (oxalic acid imayanjana ndi chitsulo ndikupanga soluble iron oxalate, yomwe imatsukidwa mosavuta ndi madzi, motero imachotsa madontho achitsulo kuchokera ku nsalu).
Kugwiritsa Ntchito Oxalic Acid Posindikiza ndi Kupaka Nsalu
(1) Kuchotsa Madontho a Dzimbiri pa Nsalu
Chitsulo chikakumana ndi mpweya ndi chinyezi mumlengalenga, chimapanga chinthu chovuta chotchedwa dzimbiri. Ngakhale kuti kapangidwe kake kamasiyana malinga ndi momwe chimakhalira, dzimbiri lonse limakhala ndi ma ayoni achitsulo atatu. Madontho a dzimbiri pa nsalu za thonje amapanga zolakwika zosatha zomwe ziyenera kuchotsedwa, ndipo oxalic acid ndi wothandizira kwambiri pochotsa. Mfundo yaikulu ndi yakuti oxalic acid imayanjana ndi ma ayoni achitsulo atatu (Fe³⁺) kuti ipange ayoni yosungunuka ya anionic complex, [Fe(C₂O₄)₃]³⁻, yomwe imasungunuka mosavuta m'madzi. Nthawi zambiri imagwiritsidwa ntchito ndi 20 g/L ya oxalic acid yokhala ndi pafupifupi 30 mL/L ya 98% acetic acid.
Chofunika Kwambiri: Oxalic acid imatha kuwononga ulusi. Pambuyo pochiza, nsalu za thonje ziyenera kutsukidwa bwino ndi madzi oyera kuti zichotse oxalic acid yonse yotsala. Ngati sizitsukidwa bwino, oxalic acid yochepetsedwa imakhazikika pakuuma, zomwe zimapangitsa kuti ulusi uwonongeke kwambiri ndikupanga mabowo.
Oxalic acid imathanso kuchotsa madontho a dzimbiri kuchokera ku nsalu za nayiloni, zomwe zikanapangitsa kuti chikasu chiwonekere.
(2) Kuchotsa Mpweya wa Nitrous Acid Panthawi Yopangidwa ndi Utoto wa Ingrain
Pogwiritsa ntchito njira ya sodium nitrite posindikiza mwachindunji ndi utoto wa ingrain pamodzi ndi utoto wa naphthol, nitrous acid imapangidwa pamene sulfuric acid ikukula. Izi zimapangitsa kuti mchere wa naphthol AS sodium pa nsalu upange ma precipitates ofiira-bulauni, zomwe zimapangitsa kuti nthaka yoyera isagwirizane. Kuti achotse nitrous acid, 1–2 g/L ya oxalic acid nthawi zina imawonjezeredwa ku yankho lopanga sulfuric acid ngati chochepetsera (kulowa m'malo mwa formic acid, urea, kapena sulfure). Oxalic acid imachepetsa nitrous acid kukhala mpweya wa nayitrogeni, zomwe zimalepheretsa HNO₂ kuchitapo kanthu ndi AS kuti apange mankhwala a bulauni.