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    • Solid Oxalic Acid CAS 144-62-7
    • Solid Oxalic Acid CAS 144-62-7

    Solid Oxalic Acid CAS 144-62-7

    Solid oxalic acid, also called ethanedioic acid, CAS 144-62-7, is a white crystalline dicarboxylic acid supplied for rare-earth extraction, metal treatment, and textile processing. Confirm the required grade and specification, then request a quotation with COA/TDS/SDS for bulk supply.

    • CAS: 144-62-7
    • Synonyms: Ethanedioic acid, Dicarboxylic acid, Hydrogen oxalate, Oxalic acid crystalline
    • Einecs: 205-634-3
    • Molecular Formula: C2H2O4
    • Grade: Industrial Grade
    • Package: 25kg/plastic woven bag
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    Product Description

    Solid Oxalic Acid CAS 144-62-7, also called ethanedioic acid, is a dicarboxylic acid with the molecular formula C2H2O4 and EINECS 205-634-3.

    Synonyms: Ethanedioic acid; Dicarboxylic acid; Hydrogen oxalate; Oxalic acid crystalline.

    CAS: 144-62-7.

    Molecular formula: C2H2O4.

    It is supplied as white transparent crystals with an assay (H2C2O4·2H2O) of not less than 99.6%.

    Sulfate (SO4) is not more than 0.08%, heavy metals (as Pb) not more than 0.001%, iron (Fe) not more than 0.0015%, and chloride (Cl) not more than 0.003%.

    Ash content is not more than 0.08%, and the melting point is about 101.5 °C for the dihydrate.

    It is soluble in water and ethanol and slightly soluble in ether.

    In rare-earth extraction it acts as a primary precipitating agent, forming insoluble oxalate salts for later high-temperature calcination.

    In metal treatment it works as a rust-removal and descaling agent, complexing iron oxides into soluble ferrioxalate ions before metal passivation.

    In textile dyeing it is used as a reducing agent and color-stabilizing mordant to neutralize residual alkalinity and improve dye fixation.

    Store it tightly sealed in a cool, dry, well-ventilated warehouse to prevent efflorescence in dry air and moisture absorption in humid conditions.

    Keep it strictly segregated from strong oxidizers, alkalis, and silver compounds.

    During handling use chemical-resistant nitrile gloves, splash goggles, and NIOSH-approved particulate respirators.

    Every batch is verified by automated potassium permanganate redox titration to quantify the dicarboxylic acid assay.

    Trace iron and sulfate impurities are monitored by ICP-OES to ensure purity meets international metallurgical and fine-chemical standards.

    Confirm appearance, assay, sulfate, heavy metals, iron, chloride, ash, melting point, solubility, and grade as required.

    The page is an RFQ entry point and does not state stock, price, MOQ, or fixed lead time.

    For an RFQ, state the intended application, required grade, quantity, packaging, destination, and document needs.

    FAQ - Technical & Supply Chain

    • Q:

      What is Solid Oxalic Acid CAS 144-62-7?

      A: CAS 144-62-7 identifies oxalic acid in its anhydrous form, with the molecular formula C2H2O4. It is a white crystalline dicarboxylic acid that is soluble in water and is supplied here as an industrial-grade solid.
    • Q:

      Is Solid Oxalic Acid CAS 144-62-7 the same as oxalic acid dihydrate?

      A: They are related but not identical. CAS 144-62-7 refers to anhydrous oxalic acid, while the dihydrate is usually identified by CAS 6153-56-6 and contains two water molecules per oxalic acid unit.
    • Q:

      What are the main industrial uses of oxalic acid?

      A: Industrial oxalic acid is used for rust and scale removal, metal surface preparation, rare earth metal separation, textile bleaching, leather processing, and chemical intermediate synthesis. Its acid and chelating properties make it useful where metal ions need to be dissolved or bound.
    • Q:

      Why is oxalic acid used in metal cleaning and treatment?

      A: It reacts with rust and metal oxides and can chelate metal ions, helping remove deposits and prepare surfaces before coating or further processing. This makes it a common choice for descaling, cleaning, and certain metal purification steps.
    • Q:

      How should Solid Oxalic Acid CAS 144-62-7 be stored and handled?

      A: Store the product in a cool, dry, ventilated area away from moisture and incompatible materials. Because oxalic acid is corrosive and toxic, use suitable gloves, eye protection, and adequate ventilation during handling.

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