Cas 6153-56-6 ≥ 99.6% Oxalic Acid Dihydrate for Auxiliaries For Dye Industry
Key attributes
Chemical formula: C₂H₂O₄·2H₂O
CAS: 6153-56-6
Purity: 99.6%
Production standard
COA need meets GB/T1626-2008:
| No. | Items for detecting and analyzing | Standard value |
| 1 | Oxalic acid content (C2H2O4) ％≥ | 99.6 |
| 2 | Sulfide (as SO4) ％≤ | 0.07 |
| 3 | Combustion residue ％≤ | 0.01 |
| 4 | heavy metal (as Pb) ％≤ | 0.0005 |
| 5 | Fluoride (as Fe) ％≤ | 0.0005 |
| 6 | Chlorine (as Cl) ％≤ | 0.0005 |
| 7 | Calcium (as Ca) ％≤ | 0.0005 |
| 8 | Water insoluble content ％≤ | 0.02 |
References: Riel Chemical Lab1&2, National public service platform for standards information.
Physicochemical property
| Molecular weight: 126.07 g/mol | Appearance: white transparent crystal or powder, industrial products may be slightly yellow due to impurities. |
| Odor: Tasteless or slightly sour. | Density: 1.65 g/cm³ (20°C). |
Melting point:
The dihydrate lost its crystalline water at 101-102°C and was converted to anhydrous oxalic acid (H₂C₂O₄).
Anhydrous oxalic acid sublimates at about 189.5°C and decomposes at high temperatures. |
Solubility:
Water: soluble in cold water (about 10 g/100 mL, 20°C), hot water solubility is higher.
Ethanol: slightly soluble (approx. 5.7g /100 mL, 20°C) |
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: |
Main uses of oxalic acid
1. Industrial cleaning
Usage: oxalic acid can effectively remove oxides, rust and scale on metal surfaces.
Applications:
Metal cleaning: Used to clean steel, copper, aluminum and other metal materials.
Equipment maintenance: Used to clean boilers, heat exchangers
and pipes to prevent scaling and corrosion.
Stone cleaning: used to remove stains and rust spots on marble,
granite and other stone surfaces.
2. Bleach
Usage: Oxalic acid has a bleaching effect, which can remove stains
and discoloration on textiles and wood.
Applications:
Textile industry: Used for bleaching natural fibers such as cotton.
Wood industry: Used for bleaching wood, removing surface stains and discoloration.
Paper industry: As a bleach, improve the whiteness of paper.
3. Chemical reagents
Uses: Oxalic acid is used as reducing agent and complexing agent in laboratory.
Applications:
Chemical analysis: For the detection and analysis of metal ions.
Organic synthesis: Participates in a variety of chemical reactions as an intermediate.
4. Rust remover
Usage: oxalic acid can dissolve rust and oxide on metal surface.
Applications:
Metal processing: Used for rust removal and maintenance of metal products.
Equipment maintenance: Used to clean and maintain industrial equipment.
5. Pharmaceutical industry
Uses: Oxalic acid is used in the synthesis of certain drugs and chemicals.
Applications:
Drug synthesis: As an intermediate to participate in the manufacture of antibiotics,
vitamins and other drugs.
Laboratory reagents: used in pharmaceutical research and analysis.
6. Food industry
Uses: Oxalic acid is used as an additive in some food processing.
Applications:
Bleaching and preservation: Used for bleaching sugar and food preservation,
but the amount needs to be strictly controlled.
7. Wood treatment
Use: oxalic acid can remove stains and discoloration on the surface of wood and restore its natural color.
Applications:
Furniture manufacturing: Used for bleaching and cleaning wood.
Woodwork maintenance: Used to repair and maintain woodwork.
FAQ
1.What is your payment term?
We can accept T/T and L/C at sight as payment term.
2.Are you able to deliver on time?
Of course! we specialised in this line for many years,
many customer make a deal with me because we can deliver the goods on time and keep the goods top quality!
3.Do you provide free sample?
Yes, we can provide free sample . You only need to take the express fee.
4.How about the price?Can you make it cheaper?
We always take the customer’s benefit as the top priority.
Price is negotiable under different conditions, we are assuring you to get the most competitive price.
5.Can I visit your company and factory in China?
Sure. You are very welcomed to visit our company in Weifang, China.
(We will have someone responsible for picking up and dropping off at Weifang Airport)
6.What if there is a quality problem?
We have a professional and perfect after-sales service team, timely for you to deal with all problems.
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