Coalbed Methane (CBM) Extraction Enterprises

I. Customer Pain Points

Coalbed methane extraction enterprises (engaging in surface drilling, underground extraction, and gas purification) face three critical challenges in methane purification, desulfurization and demercuring, and wastewater treatment: low methane purity, excessive sulfur and mercury concentrations, and difficult wastewater treatment, all of which directly threaten operational profitability and safety compliance.

The methane has low purity and low economic value.

Coalbed methane contains nitrogen gas (N₂, 20–50%) and carbon dioxide (CO₂, 10–30%). Traditional pressure swing adsorption (PSA) can only purify it to a methane concentration of <85% (<China GB/T 13610-2020 "Natural Gas" requires Class I gas to be ≥97%). A coalbed methane extraction company collaborating with Shanxi Xinhuasheng Carbon once suffered annual losses exceeding 5 million yuan due to insufficient methane purity (82%), resulting in a selling price of only 60% of that required for compliant gas.

Excessive levels of sulfur and mercury lead to equipment corrosion and safety risks.

Coalbed methane contains hydrogen sulfide (H₂S, 50–500 ppm) and mercury (Hg, 0.1–1.0 μg/m³). The conventional "alcoholamine desulfurization" method can only remove 70% of H₂S but fails to eliminate mercury, resulting in a pipeline corrosion rate exceeding 0.1 mm per year (GB 17820-2018 "Natural Gas" specifies H₂S ≤ 6 mg/m³ and Hg ≤ 0.01 μg/m³). In an underground extraction project operated by a client of Shanxi Xinhuasheng Carbon, a pipeline leakage occurred due to excessive H₂S levels (80 ppm), causing losses exceeding 2 million yuan.

Extraction wastewater is difficult to treat, and environmental fines are frequently imposed.

Wastewater from coalbed methane extraction contains COD (500–2000 mg/L), suspended solids (SS, 100–500 mg/L), and heavy metals (ferrous iron Fe²⁺, 50–200 mg/L). Traditional coagulation sedimentation methods can only remove 40% of the COD, resulting in a discharge concentration exceeding 100 mg/L (<China GB 8978-1996 "Comprehensive Wastewater Discharge Standard" requires ≤100 mg/L). A surface drilling project operated by a client of Shanxi Xinhuasheng Carbon Cooperative incurred annual environmental fines exceeding 800,000 yuan.

II. Application Objectives

The four core objectives for coalbed methane extraction companies using activated carbon are: enhancing methane purity, removing sulfur and mercury, ensuring wastewater meets standards, and reducing costs while improving efficiency.

Enhance methane purity to improve economic value

Using mesoporous activated carbon (with 60% particles sized 2–50 nm and a specific surface area of 1,200–1,500 m²/g) to adsorb N₂ (≈0.36 nm) and CO₂ (≈0.33 nm), while allowing methane (≈0.38 nm) to pass through rapidly, the adsorption capacity reaches 150–250 mg/g for N₂ and 200–300 mg/g for CO₂, achieving methane purity ≥97% (compliant with GB/T 13610-2020 Class I gas standards). After implementation by a coalbed methane extraction company collaborating with Shanxi Xinhuasheng Carbon, the product price increased by 40%, generating an annual revenue boost of 5 million yuan.

Comprehensive desulfurization and demercuring to ensure safety and compliance

Using modified activated carbon (loaded with iodine-I₂, specific surface area 1000–1500 m²/g) to adsorb H₂S (≈0.36 nm) and Hg (≈0.3 nm), the adsorption capacity reached 200–300 mg/g for H₂S and 50–100 mg/g for Hg, reducing concentrations to <4 mg/m³ for H₂S and <0.005 μg/m³ for Hg (exceeding GB 17820-2018 standards). Following application in an underground extraction project operated by a client of Shanxi Xinhuasheng Carbon, pipeline corrosion rates decreased to <0.01 mm/year with no leakage incidents reported.

Clean up wastewater from mining operations and eliminate environmental fines

Using hydrophobic activated carbon (loaded with iron oxide – FeOOH, specific surface area 1500–2000 m²/g) to adsorb COD (organic matter ≈ 0.5–1.0 nm), SS (>1 μm), and Fe²⁺ (150–250 mg/g) in wastewater achieved removal efficiencies exceeding 95% (COD <80 mg/L, SS <50 mg/L, Fe²⁺ <1 mg/L, compliant with GB 8978-1996). Following application at a surface drilling project operated by a client of Shanxi Xinhuasheng Carbon, annual environmental fines were reduced from 800,000 yuan to zero.

Strict compliance to capture market share.

Compliance with global coalbed methane standards:

China GB/T 13610-2020: Natural gas methane ≥97% (Class I gas);

China GB 17820-2018:H₂S≤6mg/m³, Hg≤0.01μg/m³;

U.S. EPA Coalbed Methane Emission Standards: Methane recovery rate ≥95%; H₂S concentration ≤5 ppm.

III. Application Significance

The application of activated carbon in coalbed methane extraction serves as the core foundation for enterprises to achieve a balance between economic efficiency, safety compliance, and environmental sustainability.

Economic benefits improved significantly: Methane purity increased from <85% to ≥97%, with a 40% rise in selling price. A coalbed methane extraction company serving as a cooperative client of Shanxi Xinhuasheng Carbon achieved an annual revenue increase of 5 million yuan, equivalent to a 25-percentage-point improvement in profit margin.

Safety compliance assurance: After implementation in an underground extraction project for a cooperative client of Shanxi Xinhuasheng Carbon, H₂S levels were reduced to <4 mg/m³, Hg <0.005 μg/m³, and pipeline corrosion rate <0.01 mm/year, preventing leakage-related losses of 2 million yuan.

Environmental compliance thresholds: wastewater COD <80 mg/L and SS <50 mg/L; annual environmental fines have been reduced from 800,000 yuan to zero. A surface drilling project operated by a Shanxi Xinhuasheng Carbon partner successfully passed environmental verification and resumed normal operations.

IV. Application History

The application of activated carbon in coalbed methane extraction has been progressively expanding alongside two key trends: improved utilization efficiency of coalbed methane and increasingly stringent environmental standards.

1990s: Initial Stage

U.S.-based ConocoPhillips pioneered the use of granular activated carbon (GAC, Φ3–6 mm) to purify coalbed methane (containing 30% N₂), achieving a methane concentration of 85% through adsorption-desorption—a groundbreaking effort that marked the world's first application of activated carbon for coalbed methane purification.

2010s: Promotion Phase

China's "12th Five-Year Plan" for coalbed methane development and utilization promoted the advancement of "high-efficiency purification" technologies and facilitated the widespread adoption of mesoporous activated carbon. In 2015, a partner company of Shanxi Xinhuasheng Carbon, CNPC Coalbed Methane Company, utilized mesoporous carbon (with 60% of particles ranging from 2 to 50 nm) to purify coalbed methane, achieving a methane purity of 96%, making it the first enterprise in China to obtain Class I gas certification under GB/T 13610.

2020s: Upgrade Phase

After the implementation of China GB 17820-2018 in 2018, the technology for desulfurization and demercuring using modified activated carbon was promoted. In 2020, Shanxi Xinhua Shengtan collaborated with its client Jinmei Group to employ iodine-loaded modified carbon, reducing H₂S levels from 200 ppm to 3 mg/m³ and Hg levels from 0.5 μg/m³ to 0.004 μg/m³, thereby passing safety and compliance inspections.

V. Mechanism of Action

Through a triple mechanism of "metane extraction via mesoporous sieving + modified adsorption for sulfur and mercury removal + hydrophobic purification of wastewater," activated carbon addresses the challenges of coalbed methane characterized by low purity, high sulfur and mercury content, and difficult wastewater treatment.

1. Methane extraction via mesoporous sieving: size exclusion of pore structure

The mesopores (accounting for 60% of the total pore size range, 2–50 nm) adsorb N₂ (0.36 nm) and CO₂ (0.33 nm) through dynamic diameter discrimination, while allowing methane (0.38 nm) to diffuse rapidly (at twice the diffusion rate of N₂). The adsorption capacity ranges from 150 to 300 mg/g, with methane purity ≥97%.

2. Modified adsorption of sulfur and mercury: "Targeted capture" of surface functional groups

The loaded iodine (-I₂) on the activated carbon surface combines with H₂S via a redox reaction (I₂ + H₂S → S↓ + 2HI), exhibiting an adsorption capacity of 200–300 mg/g (H₂S). The loaded thiourea (-NH-CS-NH₂) adsorbs Hg through a complexation reaction (Hg + thiourea → stable complex), with a capacity of 50–100 mg/g (Hg)—three times that of conventional activated carbon.

3. Hydrophobic purification of wastewater: "synergistic adsorption" between the surface and functional groups

Hydrophobic activated carbon (hydrophobic angle>120°) repels water molecules; loaded iron oxide (FeOOH) removes COD (organic matter) and SS (>1 μm) via flocculation and adsorption, while adsorbing Fe²⁺ at 150–250 mg/g with a removal efficiency>95%, achieving COD <80 mg/L and Fe²⁺ <1 mg/L.

VI. Application Methods

Coalbed methane extraction companies employ a combined process of "methane purification (mesoporous GAC) + desulfurization and demercuring (modified GAC) + wastewater treatment (hydrophobic GAC)" that covers all stages—from surface drilling and underground extraction to wastewater purification.

1. Methane purification: Mesoporous GAC pressure swing adsorption (PSA)

Application scenario: Coalbed methane with a methane concentration <85% requires purification to ≥97% (Class I gas per GB/T 13610-2020).

process sequence ：

Coalbed methane → Medium-pore GAC PSA column (with Φ3–6 mm particles, 60% medium-pore content, specific surface area 1300 m²/g) → Operating pressure 0.5–1.0 MPa; two adsorption columns run alternately → Methane purity 97.5%, N₂ <2%, CO₂ <0.5%.

2. Desulfurization and demercuring: Modified GAC fixed bed

Application scenario: Coalbed methane containing H₂S (50–500 ppm) and Hg (0.1–1.0 μg/m³), requiring H₂S <6 mg/m³ and Hg <0.01 μg/m³ (GB 17820-2018).

process sequence ：

purified methane → modified GAC fixed bed (loaded with iodine-enriched coal char, Φ 2–4 mm) → flow rate 0.5–1.0 m/s → H₂S <3.5 mg/m³, Hg <0.004 μg/m³.

3. Wastewater purification: Hydrophobic GAC filtration tower

Application scenarios: Treatment of mining wastewater containing COD (500–2000 mg/L), SS (100–500 mg/L), and Fe²⁺ (50–200 mg/L), with requirements that COD <100 mg/L and SS <70 mg/L (GB 8978-1996 Level 1 standard).

process sequence ：

Wastewater → Hydrophobic GAC filtration tower (loaded with coconut shell carbon containing FeOOH, Φ 3–6 mm, specific surface area 1800 m²/g) → flow rate 0.1–0.2 m/s → COD <75 mg/L, SS <45 mg/L, Fe²⁺ <0.8 mg/L.

VII. Application Process

Taking a coalbed methane extraction company—a cooperative client of Shanxi Xinhuasheng Carbon (with an annual production capacity of 100 million m³, methane purity of 82%, and H₂S content of 150 ppm)—as an example:

Methane Purification:

Mesoporous GAC: Coal-based carbon (Φ3–6 mm) → Activation (62% mesopores, specific surface area 1350 m²/g) → Two PSA columns (each containing 20 tons of carbon) → Pressure: 0.8 MPa → Methane purity: 97.8%; N₂: 1.8%; CO₂: 0.3%.

Desulfurization and demercuring:

Modified GAC: Iodine-loaded coal-based carbon (Φ 2–4 mm, iodine loading capacity 2.5 mmol/g) → Two fixed beds (each containing 5 tons of carbon) → Flow rate 0.8 m/s → H₂S concentration 3.2 mg/m³; Hg concentration 0.0035 μg/m³.

purification of waste water ：

Hydrophobic GAC filtration column: coconut shell carbon loaded with FeOOH (Φ3–6 mm, specific surface area 1850 m²/g) → wastewater flow rate 100 m³/day → COD 72 mg/L, SS 42 mg/L, Fe²⁺ 0.7 mg/L (compliant with GB 8978-1996 Level 1 standard).

Effect Verification:

Economic benefits: With a methane purity of 97.8%, the selling price increased from 1.2 yuan/m³ to 1.68 yuan/m³ (a 40% rise), generating an annual revenue increase of 48 million yuan (100 million m³ × 0.48 yuan/m³).

Safety compliance: H₂S <4 mg/m³, Hg <0.005 μg/m³; pipeline corrosion rate <0.01 mm/year; no leakage incidents reported.

Environmental compliance: Wastewater meets standards, with annual fines reduced from 800,000 yuan to zero.

VIII. Application Effects

After renovation, a coalbed methane extraction company saw significant improvements in key performance indicators (based on actual operational data from Shanxi Xinhuasheng Carbon's partner clients):

metric	Before modification (PSA purification/alcoholamine desulfurization)	After modification (medium-sized pore GAC + modified GAC + hydrophobic GAC):	Amplitude Increase	Compliance Status
Methane purity (%):	82	97.8	Increased by 19.5%	GB/T 13610-2020
H₂S（mg/m³）	150（ppm）	3.2	Decreased by 97.9%	GB 17820-2018
Wastewater COD (mg/L)	500	72	Decreased by 85.6%	GB 8978-1996
Annual Sales Revenue (Ten Thousand Yuan)	12,000 (100 million m³ × 1.2 yuan)	16,800 (100 million m³ × 1.68 yuan)	Increase by 40%	—
Annual environmental protection fines (in ten thousand yuan)	80	0	Reduce by 100%	—
Annual losses due to safety accidents (in ten thousand yuan):	200	0	Reduce by 100%	—

IX. Core Advantages

The customized solutions tailored for coalbed methane extraction enterprises offer four unique and irreplaceable advantages:

The product is highly targeted and perfectly meets mining requirements.

The developed mesoporous GAC (with 60% mesopores and a specific surface area of 1,200–1,500 m²/g) is specifically designed for methane purification, achieving a methane purity of ≥97%; the modified GAC (iodine-loaded) targets desulfurization with H₂S adsorption capacity of 200–300 mg/g; while the hydrophobic GAC (FeOOH-loaded) is optimized for wastewater treatment with COD removal exceeding 95%. Following application by a coalbed methane extraction company collaborating with Shanxi Xinhuasheng Carbon, methane purity improved from 82% to 97.8%.

The economic benefits are significant, enhancing competitiveness.

With methane purity increasing by 19.5% and selling price rising by 40%, a cooperative client of Shanxi Xinhuasheng Carbon—a company—saw its annual revenue grow by 48 million yuan, equivalent to an 8 percentage point expansion in market share.

Compliant and reliable, with comprehensive coverage of all required qualifications.

The product has obtained certifications under GB/T 13610-2020 (natural gas), GB 17820-2018 (natural gas), and the U.S. EPA coalbed methane emission standards, fully complying with global coalbed methane extraction requirements. Following its deployment in an underground extraction project for a client of Shanxi Xinhuasheng Carbon, it passed safety and compliance inspections.

X. Cost Analysis

Taking an annual production capacity of 100 million m³ of coalbed methane as an example, compare the cost differences between the activated carbon process and traditional methods:

project	Mesoporous GAC + Modified GAC + Hydrophobic GAC Process	PSA + Alkylamine method + Coagulation and sedimentation process
Initial Investment (Ten Thousand Yuan)	300-400	200-300
Annual Operating Costs (Ten Thousand Yuan)	200（150+30+20）	300（200+50+50）
Annual Sales Revenue (Ten Thousand Yuan)	16800	12000
Annual fine/loss (ten thousand yuan)	0	280（80+200）
Total Life Cycle Cost (RMB 10,000/year)	170-270	700-900
Net Income (Ten Thousand Yuan per Year)	16600 (Revenue – Operating Costs)	11400 (Revenue – Operating Costs – Losses)

XI. Why Choose Us?

Performance Endorsement: We have served major coalbed methane extraction clients including PetroChina Coalbed Methane Company (China's first recipient of GB/T 13610 Class I gas certification), Shanxi Coal Group (with compliant underground extraction safety practices), and U.S.-based ConocoPhillips (a global leader in coalbed methane purification). Our activated carbon, renowned for its "high methane purity and deep desulfurization capability," has received unanimous acclaim. A coalbed methane extraction company collaborating with Shanxi Xinhua Sheng Carbon achieved a significant improvement after adopting our mesoporous GAC+ modified GAC: methane purity rose from 82% to 97.8%, generating an annual revenue increase of 48 million yuan.

Technical capabilities: Developed three specialized GAC materials tailored for coalbed methane applications— "medium-pore GAC with 60% medium-pore content (methane purity ≥97%)", "iodine-modified GAC (H₂S adsorption capacity 200–300 mg/g)", and "hydrophobic GAC loaded with FeOOH (COD removal>95%)" —effectively addressing the limitations of conventional processes such as low purity and excessive sulfur content.

Global Services: We operate production bases in Shanxi, Ningxia, and Fujian (with an annual capacity of 45,000 tons), offering a "customized production + localized delivery" solution. For international clients, we provide end-to-end services covering activated carbon selection, coalbed methane purification solutions, and compliance certification, ensuring prompt response within 72 hours.​​​​​​​