GB/T 1615-2021 English PDF (GBT1615-2021)

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GB/T 1615-2021: Carbon disulfide for industrial use
GB/T 1615-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.060.99
CCS G 14
Replacing GB/T 1615-2008
Carbon disulfide for industrial use
工业二硫化碳
ISSUED ON: AUGUST 20, 2021
IMPLEMENTED ON: MARCH 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 Molecular formula and relative molecular mass ... 5
5 Requirements ... 5
6 Test methods ... 6
7 Inspection rules ... 11
8 Marking, labeling ... 12
9 Packaging, transportation, storage ... 12
Bibliography ... 13
Carbon disulfide for industrial use
Warning: According to the provisions of Chapter 6 of GB 12268-2012, this product
belongs to Class 3 flammable liquids and Class 6, Item 6.1 toxic substances, which
require careful handling. Personnel using this document shall have practical
experience in formal laboratory work. This document does not address all possible
security issues. It is the responsibility of the user to take appropriate safety and
health measures and to ensure compliance with the conditions which are set by the
relevant national regulations. Some of the reagents used in the test method are
corrosive. If they are splashed on the skin or eyes, use water to wash them
immediately; in severe cases, seek medical attention immediately.
1 Scope
This document specifies the requirements, test methods, inspection rules and marking,
labeling, packaging, transportation and storage of carbon disulfide for industrial use.
This document applies to carbon disulfide for industrial use.
Note: This product is mainly used in the production of viscose fiber, cellophane,
pesticides, rubber additives, flotation agents, chemical raw materials and
solvents, etc.
2 Normative references
The following documents are referred to in the text in such a way that some or all of
their content constitutes requirements of this document. For dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
GB/T 191-2008, Packaging - Pictorial marking for handling of goods
GB/T 615-2006, Chemical reagent - General method for the determination of
distillation range
GB/T 6678, General principles for sampling chemical products
GB/T 6680, General rules for sampling liquid chemical products
GB/T 6682-2008, Water for analytical laboratory use - Specification and test
methods
GB/T 8170, Rules of rounding off for numerical values and expression and judgment
of limiting values
6 Test methods
6.1 General provisions
The reagents and water used in this document refer to analytical reagents and grade-3
water specified in GB/T 6682-2008, unless other requirements are specified. The
standard titration solutions, preparations and products used in the test shall be prepared
according to the provisions of HG/T 3696.1 and HG/T 3696.3 unless other requirements
are specified.
6.2 Appearance inspection
In the fume hood, pipette an appropriate amount of sample into the colorimetric tube
and seal it with water; judge it visually under natural light.
6.3 Determination of distillation rate
6.3.1 Principle
Use the method of distillation to measure the distilled volume of the sample at boiling
range 45.6 °C ~ 46.6 °C.
6.3.2 Instruments and apparatuses
Same as Appendix A of GB/T 615-2006.
6.3.3 Test procedure
6.3.3.1 Calculation of observed boiling range temperature
Calculate according to 6.1 in GB/T 615-2006.
6.3.3.2 Distillation
In a well-ventilated fume hood, install the distillation device as shown in Figure 1 in
GB/T 615-2006; remove the outer cover of the distillation flask; replace it with a water
bath for heating and distillation; use an ice-water bath to cool the outside of the receiver.
Use a clean and dry receiver to measure 100 mL ± 0.5 mL of the sample at a temperature
of 5°C ~ 10°C; pour it into the distillation flask; do not let it flow into the branch pipe;
add a few clean and dry zeolites; use a stopper inserted with a thermometer to close the
distillation flask containing the sample. Make the axes of the thermometer and the
distillation flask coincide, and make the upper end of the mercury bulb and the lower
edge of the inner wall of the branch pipe of the distillation flask on the same horizontal
line. Attach the auxiliary thermometer to the main thermometer; locate the mercury bulb
at 1/2 of the height of the mercury column exposed outside the plug of the main
thermometer. Place the receiver (without drying) at the lower end of the condenser tube,
so that the mouth of the condenser tube enters the receiver part by not less than 25 mm,
and is not lower than the 100 mL scale line; cover the mouth with wetted filter paper;
place the receiver in a water batch at 5 °C ~10 °C.
Connect the cooling water; immerse the spherical part of the distillation flask in a water
bath preheated to about 50 °C; control the time from the beginning of heating to the
first drop of distillate dripping into the receiver to be 5 min ~ 10 min. Record the
temperature of the main thermometer (initial boiling point) and the reading of the
auxiliary thermometer when the first drop of distillate flows out. Control the
temperature of the water bath at about 75 °C, and the distillation rate at 3 mL/min ~ 5
mL/min. The liquid level of the water bath shall not exceed the carbon disulfide liquid
level at all times. When the thermometer reading just exceeds the final boiling point
temperature (calibrated and calculated according to 6.3.3.1), immediately remove the
water bath, leave it for 5 min, and record the distillate volume. When the initial boiling
point temperature corrected by 6.3.3.1 is not lower than 45.6 °C, the distillate volume
value is the distillation rate.
Take the arithmetic mean of the parallel determination results as the determination
result; the absolute difference between the two parallel determination results shall not
be larger than 0.5%.
6.4 Determination of density
6.4.1 Principle
Use a densimeter to measure the density of the sample; then, convert it to the density at
20 °C according to the formula.
6.4.2 Instruments and apparatuses
6.4.2.1 Densimeter: density range 1.240 g/mL ~ 1.300 g/mL, division value 0.001 g/mL.
6.4.2.2 Thermometer: temperature range 0 °C ~ 50 °C, division value 0.5 °C.
6.4.3 Test procedure
Inject the sample into a 200 mL graduated cylinder; put the densimeter in; read the
density (reading on the lower edge of the meniscus) after the densimeter is suspended
and stabilized; measure the temperature of the sample.
6.4.4 Test data processing
Calculate the density (ρ20) of carbon disulfide according to Formula (1):
Where:
Take the arithmetic mean of the parallel determination results as the determination
result; the absolute difference between the two parallel determination results shall not
be larger than 0.001%.
6.6 Determination of iodine reduction content
6.6.1 Principle
Use iodine standard titration solution to titrate the sample, where the end point is
indicated by the pink color of a slight excess of iodine in carbon disulfide solution.
6.6.2 Reagents or materials
Iodine standard titration solution: c(1/2I2) about 0.01 mol/L; use a pipette to pipette 10
mL of iodine standa...