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Oxalic Acid

Issuing time:2020-09-26 10:27


Oxalic acid is an organic substance with the chemical formula of H ü C Ψ o ₄. It is a kind of metabolite of organisms. It is a binary weak acid. It is widely distributed in plants, animals and fungi, and plays different functions in different organisms. Studies have found that more than 100 kinds of plants are rich in oxalic acid, especially spinach, amaranth, beet, purslane, taro, sweet potato and rhubarb. Oxalic acid can reduce the bioavailability of mineral elements and easily form calcium oxalate with calcium ions in human body, resulting in kidney stones. Therefore, oxalic acid is often considered as an antagonist of mineral elements absorption and utilization. Its anhydride is carbon trioxide.

Complexing agent, masking agent, precipitant and reducing agent. It is used for the determination of beryllium, calcium, chromium, gold, manganese, strontium and thorium. Sodium and other elements were examined by microcrystalline analysis. Calcium, magnesium, thorium and rare earth elements are precipitated. Calibrate the standard solution of potassium permanganate and cerium sulfate solution. bleaching agents. Dyeing aids. It can also be used to remove rust on clothes. In construction industry, oxalic acid should be applied to remove alkali before painting exterior wall coating.

The pharmaceutical industry is used to manufacture aureomycin, oxytetracycline, streptomycin, borneol, vitamin B12, phenobarbital and other drugs. Printing and dyeing industry is used as dyeing aid, bleaching agent and pharmaceutical intermediate. The plastics industry is used to produce PVC, amino plastics and urea formaldehyde plastics.

As a catalyst for the synthesis of phenolic resin, the catalytic reaction is mild, the process is relatively stable, and the duration is the longest. Oxalic acid acetone solution can catalyze the curing reaction of epoxy resin and shorten the curing time. It can also be used as pH regulator in synthesis of urea formaldehyde resin and melamine formaldehyde resin. It can also be added into polyvinyl formal water-soluble adhesive to improve drying speed and bonding strength. It is also used as curing agent of urea formaldehyde resin and chelating agent of metal ions. It can be used as an accelerant in the preparation of starch adhesive by KMnO4 oxidant, which can accelerate the oxidation rate and shorten the reaction time.

As bleaching agent

Oxalic acid is mainly used as reducing agent and bleaching agent, in the production of antibiotics, borneol and other drugs, as well as solvent for extracting rare metals, dye reducing agent, tanning agent, etc.

Oxalic acid can also be used in the production of cobalt molybdenum aluminum catalyst, metal and marble cleaning and textile bleaching.

It is used for metal surface cleaning and treatment, rare earth element extraction, textile printing and dyeing, leather processing, catalyst preparation, etc.

As reducing agent

In the organic synthesis industry, it is mainly used to produce hydroquinone, pentaerythritol, cobalt oxalate, nickel oxalate, gallic acid and other chemical products.

The plastics industry is used in the production of PVC, amino plastics, urea formaldehyde plastics, paint chips, etc.

The dye industry is used in the manufacture of base green.

The dyeing and printing industry can replace acetic acid and be used as color developing assistant and bleaching agent of pigment dyes.

The pharmaceutical industry is used to manufacture aureomycin, oxytetracycline, tetracycline, streptomycin and ephedrine.

In addition, oxalic acid can also be used to synthesize various oxalate, oxalate and oxalamide, and diethyl oxalate, sodium oxalate, calcium oxalate and other products are the largest.

As mordant

Antimony oxalate can be used as mordant and ammonium ferric oxalate is an agent for printing blueprints.

Rust removal function

Oxalic acid can be used to remove rust. However, be careful when using, oxalic acid has strong corrosivity to stainless steel. High concentration of oxalic acid is also easy to corrode hands. In addition, the acid oxalate has high solubility, but it has certain toxicity. Do not eat when using. Wash skin with water after contacting oxalic acid.

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