Henan Changge Uhemical Chemical Machinery General Plant

Granular Activated Carbon for Gas Desulfurization

Introduction:

This series is of medium or large pore size, suitable for gas desulfurization. It has high activity, large absorption capacity, low air flow resistance, and is easy to reactivate. It has good technical strength, endurable under high temperature, high pressure and water impregnation.
It is used for desulfuration of industrial gas, flue gas or fuel gas, eg coal gas, coke oven gas, natural gas. Particularly it is effective for gases in which the amount of O₂ is more than two times of that of H₂S. It can be reactivated while high purity element sulfur is obtained as byproduct.

Technical Specification:

In conformity with GB7701.1.97 and GB7702.1-22.97

Type	RS-1	RS-2	RS-3	TA-1	TA-2	RS-4	RS-5
Diameter	φ3.0-4.5 L6-18	φ3.0-4.5 L5-15	φ3.0-4.5 L5-12	φ3.0-4.0 L5-15	φ3.0-4.5 L5-12	φ3.0-6 (spherical)	φ3.0-4.0
Sulfur absorption mg/g	550	800	900	700	800	800	1000
Strength %	≥95	≥90	≥90	≥90	≥90	≥85	≥90
Water absorption %	≥40	≥55	≥70	≥50	≥65	≥45	≥65
Water %	<5	<5	<5	<5	<5	<5	<5
Pore volume cm³/g	>0.4	0.5-0.6	0.6-0.7	0.45-0.6	0.55-0.7	>0.4	0.55-0.65
Bulk density kg/L	0.60-0.65	0.50-0.55	0.45-0.53	0.6-0.70	0.55-0.60	0.55-0.65	0.5-0.55

Working Mechanism:

Removing H₂S
H₂S is catalyzed by the active sites on the surface of activated carbon to react with O₂:

The H2O formed goes away with the gas flow, and the element sulfur is captured by the activated carbon.
Removing organic sulfide
COS accounts for over 95% of the organic sulfides. COS can be catalyzed at normal temperature by the activated carbon to react with H₂S (see below), and the H₂S formed is further oxidized to element sulfur.

Application Guide:

Air flow: 300-600h^-1, civil gas: ≤100h^-1
Temperature: normal temperature to 80°C, preferably 30-50°C.
Oxygen/sulfide ratio: ≥2:1
Pressure: normal pressure to 8.0MPa
Line speed: 0.06m/s-0.1m/s, civil gas: 0.01-0.05m/s
Humidity: 70-100%(Liquid water is not to be expected)
Caution:

Supplement oxygen until the oxygen/sulfide ratio is 2:1 or more, if the gas to be treated is of oxygen deficiency.
Avoid liquid water. Liquid water may occupy the pores of activated carbon, reduce the surface area and hence weaken desulfurating ability.
If the gas to be treated does not contain NH₃⁺, use alkaline activated carbon.
Kept in cool dry places. Avoid moisture.
Avoid tar like substances contamination! It may enclose the surface and pores of activated carbon and cause irreversible impairment.