What is the required adsorption rate of activated carbon for carbon tetrachloride?

What is the required adsorption rate of activated carbon for carbon tetrachloride?

The carbon tetrachloride adsorption rate of activated carbon is a key indicator for measuring its gas-phase adsorption performance. Specific requirements and standards are as follows:

1. ‌Industry General Standards‌

‌Minimum Requirement‌: High-quality activated carbon should have a carbon tetrachloride adsorption rate of ≥60%, with some high-performance products (e.g., VOCs-specific activated carbon) reaching 80%-120%.

‌Basic Threshold‌: An adsorption rate below 60% is typically considered substandard. Activated carbon with an iodine value of 800–2000 must be paired with a carbon tetrachloride adsorption rate above 60% to ensure adsorption capacity.

2. ‌Application Scenario Differences‌

‌Industrial Waste Gas Treatment‌: Activated carbon used in chemical, pharmaceutical, and other fields for VOCs treatment requires an adsorption rate of ≥100% to extend service life and improve purification efficiency.

‌Conventional Purification‌: For indoor air purification or water treatment, an adsorption rate of 65% or higher is sufficient.

3. ‌Testing Methods and Standards‌

‌Measurement Principle‌: Calculated as the percentage of carbon tetrachloride mass to activated carbon mass at saturation under constant 25°C conditions.

‌National Standards‌: GB/T 12496.5-1999 specifies the testing method for wood-based activated carbon, while coal-based activated carbon should refer to ASTM standards.

4. ‌Influencing Factors‌

‌Raw Material Types‌: Coconut-shell activated carbon, with its rich mesopores, typically has 20–30% higher adsorption rates than coal-based activated carbon.

‌Process Conditions‌: For every 5°C increase in production temperature, the adsorption rate may drop by 8–12%, necessitating low-temperature extraction (e.g., 10°C) to maintain performance.

5. ‌Quick Testing Recommendations‌

Use the "look, weigh, test, measure" simple method to preliminarily assess activated carbon quality, focusing on whether the carbon tetrachloride adsorption rate meets standards.

The ST-65 Activated Carbon Tetrachloride Adsorption Rate tester is suitable for measuring the carbon tetrachloride adsorption rate of wooden activated carbon and coal based activated carbon. It is designed and manufactured in accordance with the national standards of GB/T7702.13 Test Methods for Coal based Granular Activated Carbon - Determination of Carbon tetrachloride adsorption rate and GB/T12496.5 Test Methods for Wooden Activated Carbon - Determination of Carbon tetrachloride adsorption rate (activity). The instrument consists of a high-precision temperature control unit, a stainless steel water bath system, etc., which has the characteristics of high temperature control accuracy and long insulation time.

The activated carbon tetrachloride desorption rate meter adopts a 4.3-inch intelligent touch screen, which automatically controls the constant temperature of the water bath box, ensuring that the water bath temperature is always maintained at the set temperature. The new intelligent timing function allows for arbitrary setting of working hours, avoiding the uncertainty of manual timing.

Adopting a high-precision platinum probe and a non fixed probe design, it can detect real-time temperature at each working point of the water bath at any time. The water bath unit adopts a double-layer design, filled with environmentally friendly insulation materials inside, which has excellent constant temperature effect and is more energy-efficient.