Oxalic acid, also known as glyoxylic acid, is an organic binary weak acid with the chemical formula CHHOO₄, and its common form is a dihydrate (CHHOO·*2HOO), with a relative molecular weight of 90.04 (anhydrous) and 126.07 (dihydrate).Oxalic acid is odorless, sour and astringent in taste. The substance is colorless, transparent crystal or white granular, crystalline powder. Common forms include crystallized, powdered (anhydrous), and dihydrate crystallized.It is soluble in water, ethanol, and slightly soluble in ether. The aqueous solution is strongly acidic with a pH value of about 1.5-2.5. It is corrosive and can corrode metals, skin and mucous membranes.It is stable in the air. When oxalic acid dihydrate is heated to 100℃, it loses its crystalline water and becomes anhydrous oxalic acid. It continues to be heated to above 150℃ and decomposes to produce carbon dioxide and carbon monoxide. It needs to be sealed and stored in a cool and dry place, away from metals, alkaline substances and food.In industrial production, it is used in water treatment, metallurgy, printing and dyeing, chemical industry, medicine and other fields, as a reducing agent, bleaching agent, rust remover, chelating agent, and also used in organic synthesis, metal cleaning, fabric bleaching and other processes.Its strong acidity and reducing properties can efficiently remove metal rust and chelate alloy ions in the industrial field, and it can be used as an intermediate in organic synthesis in the chemical field, which is widely used.

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Application Description

1. It is used as a chelating agent, rust remover, and reducing agent in the field of water treatment. It is used in industrial wastewater treatment (such as electroplating wastewater, metallurgical wastewater, etc.). It can efficiently chelate calcium, magnesium, iron and other metal ions in the water, remove heavy metal impurities and scale in the water, and at the same time reduce oxidizing pollutants in the water, reduce the difficulty of wastewater treatment, and improve water quality.
2. Used as a reducing agent and purifying agent in the metallurgical industry, it is used in the smelting and purification of rare metals (such as titanium, zirconium, hafnium, etc.), which can reduce metal oxides and improve metal purity. At the same time, it is used for metal surface rust removal treatment to remove oxidized rust from the surface of steel and non-ferrous metals, and improve the surface finish of the metal.
3. It is used as a bleaching agent, reducing agent, and mordant in the printing and dyeing industry. It is used in the bleaching treatment of textiles. It can remove pigments and impurities from the fabric and improve the whiteness of the fabric. It is also used in the decolorization treatment of printing and dyeing wastewater to reduce the chromaticity of the wastewater. It can also be used as a mordant to assist dyes in coloring and improve dyeing fastness.
4. In the chemical industry, it is used as an intermediate in organic synthesis and is used in the production of oxalate, ammonium oxalate, medicine, dyes and other chemical products. It can also be used as a solvent and rust remover. It is widely used in chemical raw material synthesis, equipment cleaning and other scenarios. It is one of the important basic chemical raw materials.
5. It is used in the food industry as a bleaching agent, preservative, and acidity regulator (limited use) to remove impurities and bleach color in food processing, such as the bleaching of flour and starch. At the same time, it can adjust the acidity of food, extend the shelf life of food, and strictly comply with food-grade safety standards.
6. The pharmaceutical industry is used as an intermediate in drug synthesis for the production of antibiotics, vitamins, antipyretic analgesics and other drugs. At the same time, it can be used as an analytical reagent for pharmaceutical testing to assist in drug purity testing and quality control to meet the high standards of the pharmaceutical industry. Requirements.
7. It is used as a cleaning agent and rust remover in light industry. It is used for cleaning and rust removal of metal products, ceramics, glass and other products. It can quickly remove surface scale and rust. At the same time, it is used for ash removal and bleaching in leather processing to improve leather quality.
8. It is used as a chemical reagent in the laboratory, as a reducing agent, chelating agent, and acidity regulator. It is used in experimental operations such as chemical analysis, organic synthesis, and water quality testing. It can also be used to calibrate pH meters and prepare standard buffer solutions to assist in the smooth progress of various experiments.