Product Overview
Our acid washed coal carbon(DCS) is made from select bituminous coal that we carbonize, steam-activate and then put through an extended acid-washing circuit, bringing the pH down to a stable 5–8 while keeping iodine adsorption above 950 mg/g and methylene blue above 160 mg/g. Standard coal carbons carry alkaline ash that can swing the pH of sugar syrups, organic acids or pharmaceutical intermediates; this grade removes that risk at the source. We manufacture it in-house and supply it with batch certificates covering pH, ash, iodine and moisture, so your purification process stays in spec from lot to lot.
Key Application Areas
- Organic Acid Purification — Removes color bodies and impurities from organic acid process streams without altering acid chemistry or introducing alkaline contaminants.
- Inorganic Acid Treatment — Polishes inorganic acids by adsorbing organic contaminants and trace color bodies, maintaining product clarity and specification compliance.
- Chemical Processing & Purification — Purifies intermediates, solvents, and fine chemicals where pH-neutral adsorption prevents unwanted side reactions.
- Sugar Decolorization — Treats cane and beet sugar syrups to achieve target brightness while maintaining neutral pH that avoids inversion or degradation of sucrose.
- Pharmaceutical Purification — Decolorizes active pharmaceutical ingredients and excipients where low ash and pH stability are required for regulatory compliance.
Specifications
| Technical Specifications | DCS 830 | DCS 1240 | Unit |
|---|---|---|---|
| Iodine Adsorption Value | >950 | >950 | mg/g |
| Moisture Content | <5 | <5 | % -wt |
| Methylene Blue Adsorption Value | >160 | >160 | mg/g |
| pH | 5-8 | 5-8 | - |
| Average Particle Size | 1.4-1.7 | 1.2-1.4 | mm |
| Crush Strength | >90 | >90 | % |
| Specific Surface Area | >900 | >900 | m²/g |
| Particle Size >8 Mesh (1.70 mm) | <10 | - | % -wt |
| Particle Size >12 Mesh (1.70 mm) | - | <5 | % -wt |
| Particle Size <30 Mesh (0.6 mm) | <5 | - | % -wt |
| Particle Size <40 Mesh (0.43 mm) | - | <5 | % -wt |
Available particle size
- 8×30 Mesh ( 0.6 ~ 2.36 mm)
- 12×40 Mesh ( 0.43 ~ 1.7 mm)
Packaging
- 25 kg/Bag
- 500 kg/Bag
Key Advantages
- Acid-Washed pH Stability: The 5–8 pH range eliminates alkaline spikes common in standard coal carbons, protecting pH-sensitive processes and reducing post-treatment correction needs.
- Dual-Indicator Performance: Iodine >950 mg/g ensures rapid small-molecule adsorption, while methylene blue >160 mg/g confirms effective large-molecule and color body removal.
- Low Extractable Content: Acid washing reduces soluble ash and metal ions, minimizing contamination risk in pharmaceutical and food-contact applications.
- Dual Mesh Options: DCS 830 (1.4–1.7 mm) suits high-flow systems; DCS 1240 (1.2–1.4 mm) offers enhanced kinetics for tighter purification requirements.
Why Acid Washing Matters for pH-Sensitive Processes
Standard coal-based activated carbons are naturally alkaline because of residual ash and minerals. In sugar refining, organic acid production or pharmaceutical purification, that alkalinity can trigger sucrose inversion, unwanted side reactions or off-spec effluent — and correcting it means extra pH-adjustment equipment, chemicals and cost.
Our acid-washing protocol removes soluble ash and alkaline residues before the carbon leaves our plant, locking the pH into a 5–8 window without damaging the pore structure. High iodine keeps small-molecule adsorption fast, while methylene blue above 160 mg/g confirms the mesopores still pull out large color bodies. The result is clean, stable decolorization with no downstream pH correction.
DCS vs Standard DC Coal Granular Carbon
Our standard coal granular carbon (DC) is the right choice for general decolorization where natural pH is acceptable. When your process is acid-sensitive — sugar syrups at risk of inversion, pharmaceutical streams under pharmacopeial limits — this acid-washed grade adds the extended washing step that brings pH to 5–8 and cuts extractable metals. Choose DC for general purification duty; choose the acid-washed grade when pH stability and low extractables are specified.
Quality Control & Supply
Produced in-house under ISO 9001 quality management, with food-contact batches manufactured under our food production license, every lot ships with a certificate of analysis covering pH, ash, iodine, methylene blue and moisture. Send us your stream composition and our technical team will recommend between the 8×30 and 12×40 mesh options, with samples available for pilot trials.