White 99.6% Oxalic Acid Anhydrous 25kg 1000kg Oxalic Acid For Removing Rust

Chemical formula: C₂H₂O₄*2H₂O

CAS: 6153-56-6

Purity: 99.6%

COA need meets GB/T1626-2008:

References: Riel Chemical Lab1&2, National public service platform for standards information.

Oxalic acid is an organic acid with the systematic name ethanedioic acid and chemical formula HO−C(=O)−C(=O)−OH, also written as (COOH)2 or (CO2H)2 or H2C2O4.

It is the simplest dicarboxylic acid. It is a white crystalline solid that forms a colorless solution in water. Its name is derived from early investigators who isolated oxalic acid from flowering plants of the genus Oxalis, commonly known as wood-sorrels. It occurs naturally in many foods. Excessive ingestion of oxalic acid or prolonged skin contact can be dangerous.

Acid: Binaric acid, acidic stronger than acetic acid (pKa₁=1.25, pKa₂=4.14); It can react with bases, metal oxides, carbonates to form salts (such as sodium oxalate, calcium oxalate).

Reducibility: Under acidic conditions can be oxidized by strong oxidants (such as potassium permanganate) to produce CO₂ and H₂O.

Complexation: Oxalate (C₂O₄²⁻) forms a soluble complex with metal ions (e.g. Fe³+, Al³+). It is used in metal cleaning or rust removal.

Thermal decomposition: Decomposition when heated above 150°C, producing CO, CO₂ and H₂O.

Oxalic acid is produced primarily by oxidizing carbohydrates or glucose with nitric acid or air in the presence of vanadium pentoxide. Another method is to regenerate nitric acid using oxygen, using a variety of precursors, including glycolic acid and glycol. As of 2011, only the Japanese company Mitsubishi has used this process.

A newer method requires oxidative carbonylation of alcohols to obtain dioxalate: 4 ROH + 4 CO + O 2 -> 2 (CO 2 R) 2 + 2 H 2 O. These diesters are then hydrolyzed to oxalic acid. About 120,000 tons are produced annually.

Historically, oxalic acid was prepared by applying a caustic base (such as sodium hydroxide or potassium hydroxide) to sawdust and then acidifying the oxalate with an inorganic acid (such as sulfuric acid). Oxalic acid can also be formed by heating sodium formate in the presence of an alkaline catalyst.

The main uses of oxalic acid include cleaning or bleaching, especially for rust removal (iron complexing agent). Its use in rust remover is due to the fact that it forms a stable water-soluble salt with trivalent iron, namely the iron oxalate ion.

Oxalic acid is an ingredient in some teeth whitening products. About 25% of oxalic acid is used as a mordant in the dyeing process. It is also used in bleach, especially for pulping wood, cork, straw, rattan, feathers, as well as for rust removal and other cleaning, for baking powder, and as a third reagent in silica analysis instruments.

For metals: Oxalic acid can corrode active metals such as iron and aluminum, forming soluble salts (such as iron oxalate), and is often used for rust removal. However, excessive use may damage the metal surface. Stainless steel and copper products may lose their luster after long-term contact.

For the skin/mucous membranes: Direct contact can irritate the skin, causing redness, swelling and burns. Inhaling the powder may damage the respiratory tract.

For stone/tiles: Although it can clean stains, frequent use will corrode marble and granite (containing calcium carbonate), resulting in a rough surface.

Protective measures: Wear rubber gloves, goggles and masks; Keep the air circulating and avoid inhaling dust or steam.

Concentration control: For household use, it is recommended to dilute to 3%-10% (e.g., 10g oxalic acid mixed with 100ml water). For industrial use, adjust as needed.

Neutralization treatment: After use, the residue can be rinsed off with baking soda water (alkaline) to reduce the risk of corrosion.

Recommended uses: Metal rust removal, cleaning of stubborn stains on tiles; Textile mordant (professional operation required).

Avoid using: Aluminium products, marble countertops, leather; Soak the clothes directly (which may cause fiber damage).

Skin contact: Rinse immediately with plenty of water for 15 minutes and seek medical attention.

Ingestion by mistake: Do not induce vomiting. Dilute with milk or water and seek medical attention immediately.