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

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.

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

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.

What are the main industrial uses of oxalic acid?

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.

Why is oxalic acid used in metal cleaning and treatment?

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.

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

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.

Solid Oxalic Acid CAS 144-62-7

Solid Oxalic Acid (CAS 144-62-7) is a crystalline organic compound serving as a fundamental reducing and chelating agent within the broader category of Basic & Fine Chemicals. Operating as a highly efficient hydrogen oxalate donor, this solid ethanedioic acid exhibits strong coordination capabilities with transition metals, making the dicarboxylic acid matrix integral to industrial rare earth metal extraction and the purification of inorganic chemical intermediates. Its concentrated crystalline formulation provides excellent precipitation control and targeted oxide removal when deployed as a base oxalic acid crystalline reagent in demanding metallurgical, surface treatment, and textile bleaching processing environments. To support large-scale continuous manufacturing schedules, our facility maintains extensive bulk supply capabilities, ensuring consistent assay purity with customized specifications to meet precise metallurgical and synthesis requirements, all backed by competitive factory pricing and comprehensive technical documentation including MSDS, TDS, COA.

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

Technical Data

Physicochemical Properties	Standard Specification (Industrial Dihydrate Grade)
Appearance	White transparent crystals
Assay (H2C2O4·2H2O)	≥ 99.6%
Sulfate (SO4)	≤ 0.08%
Heavy Metals (as Pb)	≤ 0.001%
Iron (Fe)	≤ 0.0015%
Chloride (Cl)	≤ 0.003%
Ash Content	≤ 0.08%
Melting Point	101.5°C (Dihydrate)
Solubility	Soluble in water and ethanol; slightly soluble in ether

Applications

Rare Earth Extraction: Functions as a primary precipitating agent in the hydrometallurgical processing of rare earth elements, forming highly insoluble oxalate salts intended for subsequent high-temperature calcination.
Industrial Metal Treatment: Utilized as a rust-removal and metal surface descaling agent, acting to chemically complex iron oxides into highly soluble ferrioxalate ions prior to industrial metal passivation.
Textile & Dyeing: Applied as a reducing agent and color-stabilizing mordant in industrial textile dyeing processes to neutralize residual alkalinity and improve dye fixation.

For organic-acid cleaning and pH-control applications where a tricarboxylic acid is specified, Citric Acid is a separate chelating acid.

Storage & Safety

Storage Conditions: Store in a cool, dry, and well-ventilated warehouse environment. The material must be kept tightly sealed to prevent efflorescence in dry air or moisture absorption in humid conditions. It must be strictly segregated from strong oxidizers, alkalis, and silver compounds.
Safety & Handling: This solid acid is highly corrosive and toxic upon ingestion or extensive dermal contact. Industrial handling requires standard local exhaust ventilation. Operators must utilize chemical-resistant nitrile gloves, tight-fitting splash goggles, and NIOSH-approved particulate respirators to prevent dermal burns and respiratory tract irritation from airborne crystal dust.

Quality Assurance

Our chemical production lines operate under rigorous ISO 9001 quality management systems. Every batch undergoes precise analytical verification utilizing automated potassium permanganate redox titration to quantify the exact dicarboxylic acid assay. We strictly monitor trace iron and sulfate impurities via Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES) to guarantee the reagent’s purity complies fully with stringent international metallurgical and fine chemical processing standards.

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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