GB/T 7702.14-2008: Test method for granular activated carbon from coal -- Determination of sulphur capacity

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Scope

This Part specifies the content such as principle, steps and result calculation for the
determination of sulphur capacity of granular activated carbon from coal. This Part applies
to the determination of sulphur capacity of granular activated carbon from coal. It also
applicable to impregnated activated carbon.
2  Normative references
The following standards contain provisions which, through reference in this text, constitute
provisions of this Part of GB/T 7702. For dated reference, the subsequent amendments
(excluding correction) or revisions of these publications do not apply. However, the parties
who enter into agreement based on this standard are encouraged to investigate the
possibility of applying the most recent editions of the standards. For undated references,
the latest edition of the normative document referred to applies.
GB/T 601-2002 Chemical Reagent - Preparations of Standard Volumetric Solutions
GB/T 603-2002 Chemical Reagent - Preparations of Reagent Solutions for Use in
Test Methods
GB/T 625 Chemical Reagent - Sulfuric Acid (GB/T 625-2007, ISO 6353-2. 1983,
NEQ)
GB/T 631 Chemical Reagent - Ammonia Solution (GB/T 631-2007, ISO 6353-2. 1983,
NEQ)
GB/T 676 Chemical Reagent - Acetic Acid (GB/T 676-2007, ISO 6353-2. 1983, NEQ)
GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods
(GB/T 6682-2008, ISO 3696.1987, MOD)
GB/T 7702.10-2008 Test Method for Granular Activated Carbon from Coal -
Determination of Service Life Against Benzene and Chloroethane Vapours
GB/T 10500 Industrial Natrium Sulfide
WJ 2281 Verification Regulation of Float Meter for Protective Equipment Test
constant-temperature drying oven at 150°C±5°C to dry for 2 h. Then place in dryer to cool
down for later use.
7.2 Penetration sulfur capacity
Take about 200 g of specimen by using quartering method. Place in electrothermal
constant-temperature drying oven at 150°C±5°C to dry for 2 h. Then place in the dryer to
cool down for later use.
8  Determination preparations
8.1 Instrument installation
Use rubber tube and glass tube to connect the various instrument parts in sequence
according to the schematic diagrams (Figure 1, 2 and 3).
8.2 Air tightness inspection
8.2.1 Check the air tightness of the instruments connected before being used.
8.2.2 When checking air tightness, connect a pressure gauge at piston K2 (Figure 1).
Close all pistons that are through the atmosphere. Access in the compressed air slowly.
Close K1 when the internal pressure of the whole instrument reaches 13.3 kPa (gauge
pressure). Observe the pressure change. If the pressure drop is less than 0.26 kPa within
1 min, the air tightness is qualified. Otherwise, find out the causes and handle the
non-hermetic parts.
8.3 Air flow
The control of air flow shall meet the requirements of 9.3 in GB/T 7702.10-2008.
8.4 Humidity of air flow
The control of air flow humidity shall meet the requirements of Annex A in GB/T
7702.10-2008.
8.5 Determination of initial mass concentration of hydrogen sulfide
Inject 50 mL of zinc acetate solution, of which the mass concentration is 2%, into two
in-series suction bottles. Remove the suction bottles after accessing gas for 20 min. Blow
and wash the solution in the suction bottles into a 200 mL conical flask. Add excessive
standard iodine solution (above 40 mL). Use starch as the indicator; use sodium
thiosulfate standard titration solution to titrate the excessive iodine.
The initial mass concentration of hydrogen sulfide, in ρ0, its numeric value is expressed in
mg/L, is calculated by Formula (1);
Where.
ρ0 — initial concentration of hydrogen sulfide in mixed air flow, mg/L;
qv — flow rate of gas mixture through the determination tube, L/min;
tb — penetration time when the volume fraction of hydrogen sulfide reaches 50×10-6,
min;
m — mass of specimen, g.
10.3 For each specimen, conduct the parallel determination of 2 test materials. The
results are expressed in arithmetic mean value, and shall be accurate to the integer.
10.4 The difference between the 2 determination results shall not be greater than 10%.
11 Test reports
The test report shall include the following contents.
a) Serial number of the sample;
b) The standards used;
c) The methods used;
d) Test items;
e) Test results;
f) Testing personnel;
g) Date of test.

Basic Data

Standard ID	GB/T 7702.14-2008 (GB/T7702.14-2008)
Description (Translated English)	Test method for granular activated carbon from coal -- Determination of sulphur capacity
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	D24
Classification of International Standard	75.160.10
Word Count Estimation	10,110
Date of Issue	2008-11-20
Date of Implementation	2009-05-01
Older Standard (superseded by this standard)	GB/T 7702.14-1997; GB/T 7702.22-1997
Regulation (derived from)	National Standard Approval Announcement 2008 No.19 (Total No.132)
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This standard specifies the principles of granular activated carbon from coal sulfur capacity measurement, measurement procedures and results of calculation content. This section applies to the determination of sulfur capacity of granular activated carbon from coal. Also applies to the impregnated activated carbon.