In Q2 2026, we shipped 52 tons of 4mm coal-based pellet activated carbon to a petrochemical client in the Middle East. The carbon is used in fixed-bed adsorbers for VOC removal from process exhaust — specifically toluene, xylene, and mixed C5–C9 hydrocarbons at 40–60°C inlet temperature.
This is how the order went from first inquiry to delivery.
The client operates a plastics manufacturing complex with three exhaust streams requiring VOC treatment. Their existing carbon (sourced from a European distributor) was underperforming — breakthrough happening at 60% of rated bed life.
| Parameter | Client specification | What we supplied |
|---|---|---|
| Carbon type | Coal-based pellet (extruded) | 4mm coal-based pellet |
| Diameter | 4.0 mm | 4.0 mm (±0.2 mm tolerance) |
| Iodine number | ≥900 mg/g | 950 mg/g (tested) |
| CTC value | ≥60% | 65% (tested) |
| Hardness | ≥95% | 97% |
| Moisture | ≤5% | 3.2% |
| Ash content | ≤12% | 9.5% |
| Bulk density | 450–550 g/L | 480 g/L |
| Quantity | 56 tons (3 adsorbers ×
~18.5 tons each) |
56 tons |
The CTC (carbon tetrachloride activity) value was the critical spec — it measures vapor-phase adsorption capacity, which directly determines how long the bed lasts before breakthrough. Their previous supplier was delivering 55–58% CTC, which explains the early breakthrough.
Pellet (extruded) activated carbon is the standard choice for gas-phase VOC treatment because:
Granular carbon (irregular shape) creates 20–40% higher pressure drop at the same flow rate and generates more dust during handling and operation. For large gas-phase adsorbers, pellet is always the better engineering choice.
The 52-ton order took 12 days to produce. Our QC process for this shipment:
Raw material stage:
In-process checks:
Finished product testing (every 5-ton batch):
Final COA:
We issued 12 batch COAs (one per ~5 tons) plus a composite COA for the full 52 tons. Client also requested third-party SGS inspection before loading — passed without issues.
| Item | Detail |
|---|---|
| Packing | 25 kg woven PP bags, palletized |
| Bags per pallet | 40 bags (1 ton/pallet) |
| Total pallets | 52 |
| Container type | 2 × 40' HQ containers |
| Loading per container | 26 tons each |
| Moisture barrier | PE liner inside container |
| Fumigation | Methyl bromide free (client requirement) |
Pellet carbon is sensitive to moisture absorption during transit — especially to the Middle East where port humidity can be high. We line each container with PE sheeting and include silica gel desiccant packs as standard for Gulf destinations.
| Stage | Timeline |
|---|---|
| Order confirmed | Day 0 |
| Production complete | Day 12 |
| SGS inspection | Day 14 |
| Container loading | Day 15 |
| Port departure (Tianjin) | Day 18 |
| Arrival at destination port | Day 38 (20 days transit) |
| Client confirmation received | Day 42 |
Total lead time from order to delivery: 42 days. Production was the bottleneck (12 days) — transit time to the Gulf is fixed at ~20 days from North China ports.
For clients who need faster delivery: we maintain 200+ tons of 4mm pellet carbon in stock at any given time. Stock orders can ship within 3–5 days of payment, cutting total delivery to under 30 days.
Six weeks after installation, the client reported:
They've since placed a second order (same spec, 52 tons) for their scheduled bed replacement in Q4 2026. Annual consumption: ~112 tons.
The client's previous carbon was sourced through a European distributor at approximately $2,800–3,200/ton CIF. Our direct factory price delivered CIF to their port:
The cost saving on 112 tons/year is significant. And the better CTC value means longer bed life — so actual cost-per-operating-hour drops even further.
If you're running a similar VOC treatment system, here's what to specify:
| Parameter | Recommended for VOC | Why it matters |
|---|---|---|
| Type | Coal-based pellet (extruded) | Low pressure drop, survives regeneration |
| Diameter | 3 mm or 4 mm | 4mm for high-flow; 3mm for higher removal but more ΔP |
| CTC | ≥60% (higher is better) | Directly determines bed life for VOC adsorption |
| Iodine | ≥900 mg/g | General adsorption capacity indicator |
| Hardness | ≥95% | Must survive handling + regeneration cycles |
| Ash | ≤12% | High ash = less active carbon per kg |
| MOQ | 10 tons | Our minimum order for custom specs |
Coal-based pellet (extruded) activated carbon in 3mm or 4mm diameter is the industry standard for fixed-bed VOC adsorption. The key spec is CTC value (carbon tetrachloride activity) — aim for ≥60%. Higher CTC means more vapor-phase adsorption capacity and longer bed life between regeneration or replacement cycles.
It depends on gas flow rate, VOC concentration, and target outlet concentration. A typical industrial adsorber treating 10,000–30,000 m³/hr of exhaust uses 15–25 tons of carbon per vessel. Most systems have 2–3 vessels (one adsorbing, one regenerating, one on standby). Annual replacement or top-up is typically 15–25% of total bed volume.
3mm pellets have more surface area per unit volume (better removal efficiency) but create higher pressure drop. 4mm pellets have lower pressure drop (less fan energy needed) but slightly lower removal kinetics. For high-flow industrial systems (>20,000 m³/hr), 4mm is usually preferred. For smaller systems or when emission limits are very tight, 3mm may be worth the extra pressure drop.
Typically 12–18 months before replacement is needed, depending on inlet VOC concentration and whether the system includes thermal regeneration. With on-site steam or hot nitrogen regeneration, the same carbon can last 3–5 years before adsorption capacity degrades below useful levels. Without regeneration, it's a one-time use with 12–18 month life.
Yes. Our standard 4mm pellet runs CTC 60–65%. For heavy-duty applications (high VOC concentration or tight emission limits), we produce a high-CTC variant at 70–75% CTC. This requires longer activation time and yields less per batch, so price is approximately 15–20% higher. MOQ 10 tons, lead time 15–18 days.
We supply 3mm and 4mm coal-based pellet activated carbon for VOC, solvent recovery, and industrial gas treatment. MOQ 3 tons, monthly capacity 700+ tons across all grades, CIF delivery worldwide.
Huamei Activated Carbon Co., Ltd.
Website: www.huameicarbon.com
