GB/T 3392-2023 PDF English
US$230.00 · In stock · Download in 9 secondsGB/T 3392-2023: Determination of hydrocarbon impurities of propylene for industrial use - Gas chromatographic method Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 3392: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 3392-2023 | English | 230 |
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Determination of hydrocarbon impurities of propylene for industrial use - Gas chromatographic method
| Valid |
| GB/T 3392-2003 | English | 170 |
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Propylene for industrial use -- Determination of hydrocarbon impurities -- Gas chromatographic method
| Obsolete |
| GB/T 3392-1991 | English | 399 |
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Propylene for industrial use--Determination of hydrocarbon impurities--Gas chromatographic method
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Similar standards GB/T 3399 GB/T 3394 GB/T 3392-2023: Determination of hydrocarbon impurities of propylene for industrial use - Gas chromatographic method
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT3392-2023
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
ICS 71.080.10
CCS G 16
GB/T 3392-2023
Replacing GB/T 3392-2003
Determination of hydrocarbon impurities of propylene for
industrial use - Gas chromatographic method
Issued on: NOVEMBER 27, 2023
Implemented on: JUNE 1, 2024
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 6
4 Principle... 6
5 Reagents and materials... 6
6 Instruments... 7
7 Sampling... 10
8 Measurement steps... 11
9 Presentation of results... 14
10 Precision... 14
11 Quality assurance and control... 15
12 Test report... 15
Appendix A (Informative) Theoretical relative volume correction factors of methane,
ethane, and ethylene relative to propylene... 16
Determination of hydrocarbon impurities of propylene for
industrial use - Gas chromatographic method
WARNING. This document does not intend to explain all safety issues related to
its use. Users are responsible for taking appropriate safety and health measures to
ensure compliance with relevant national laws and regulations.
1 Scope
This document specifies the gas chromatography method for the determination of
industrial propylene purity and hydrocarbon impurities, including methane, ethane,
ethylene, propane, cyclopropane, isobutane, n-butane, propadiene, acetylene, trans-2-
butene, 1-butene, isobutylene, cis-2-butene, 1,3-butadiene, methylacetylene, etc.
This document is applicable to the determination of industrial propylene with a purity
greater than 98% (volume fraction) and a hydrocarbon impurity content not less than 1
mL/m3.
2 Normative references
The provisions of the following documents constitute the essential clauses of this
document through normative references in this text. Among them, for referenced
documents with dates, only the versions corresponding to the dates are applicable to
this document; for referenced documents without dates, the latest versions (including
all amendments) are applicable to this document.
GB/T 3393 Ethylene and propylene for industrial use - Determination of trace
hydrogen - Gas chromatographic method
GB/T 3394 Determination of trace carbon monoxide, carbon dioxide and acetylene
of ethylene and propylene for industrial use - Gas chromatographic method
GB/T 3396 Determination of trace oxygen in ethylene and propylene for industrial
use - Electrochemical method
GB/T 3723 Sampling of chemical products for industrial use - Safety in sampling
GB/T 3727 Ethylene or propylene for industrial use - Determination of trace water
GB/T 8170 Rules of rounding off for numerical values & expression and judgment
of limiting values
GB/T 12701 Ethylene and propylene for industrial use - Determination of trace
oxygenates - Gas chromatographic method
GB/T 13290 Propylene and butadiene for industrial use - Sampling in the liquid
phase
GB/T 19186 Propylene for industrial use - Determination of oligomers - Gas
chromatographic method
3 Terms and definitions
There are no terms or definitions that require definition in this document.
4 Principle
4.1 Corrected area normalization method
Under the conditions specified in this document, the sample is injected into the
chromatograph for analysis. The peak areas of each impurity and main component are
measured, and the content of each impurity component is calculated by the corrected
area normalization method. Impurities such as hydrogen, oxygen, carbon monoxide,
carbon dioxide, water, oligomers and oxygen-containing compounds are determined
using the corresponding standard methods, and the results are normalized with the
results determined in this document.
4.2 External standard method
Under the conditions specified in this document, the sample to be tested and the external
standard are injected into the chromatograph for analysis. The peak areas of the
impurity components to be tested in the sample and the standard are determined, and
the content of each impurity is calculated from the peak area ratio of the corresponding
impurities in the sample and the standard. The purity of propylene can be obtained by
subtracting the total amount of hydrocarbon impurities and the total amount of
impurities such as hydrogen, oxygen, carbon monoxide, carbon dioxide, water,
oligomers and oxygen-containing compounds determined by other standard methods
from 100%.
5 Reagents and materials
5.1 Carrier gas and auxiliary gas
High-purity nitrogen or high-purity helium, with a purity of not less than 99.999%
(volume fraction), dried and purified by silica gel and 5A molecular sieve.
5.2 Combustion gas
Hydrogen, with a purity of not less than 99.99% (volume fraction), is dried and purified
by silica gel and 5A molecular sieve.
5.3 Combustion-supporting gas
Air, oil-free, dried and purified by silica gel and 5A molecular sieve.
5.4 Standard samples
With propylene as the background, the gaseous or liquid standard sample contains
hydrocarbon components such as methane, ethane, ethylene, propane, cyclopropane,
isobutane, n-butane, propadiene, acetylene, trans-2-butene, 1-butene, isobutylene, cis-
2-butene, 1,3-butadiene, and methylacetylene. The gaseous or liquid standard sample
with known hydrocarbon component content can be purchased from the market or
prepared by weighing. The content of hydrocarbon components in the standard sample
shall be similar to that of the sample to be tested. If prepared by oneself, the propylene
background sample used in the preparation shall be checked in advance under the
conditions specified in this document. There shall be no chromatographic peak eluting
at the component to be tested; otherwise, it shall be corrected.
If a liquid standard is used, a standard cylinder with a movable piston can be used and
filled with inert gas so that the pressure in the cylinder can be maintained at 1380 kPa
or higher than the standard vapor pressure at room temperature to ensure the stability
of methane, ethane, and ethylene components in the liquid standard. If the methane,
ethane, and ethylene components cannot be kept stable, a liquid standard that does not
contain these three impurities can also be selected.
6 Instruments
6.1 Gas chromatograph
A gas chromatograph equipped with a gas injection valve or a liquid injection valve and
a hydrogen flame ionization detector (FID). The peak height generated by the
instrument for the lowest measured impurity concentration specified in this document
shall be at least twice the noise, and the dynamic linear range of the instrument shall
meet the quantitative requirements.
6.2 Chromatographic columns
The chromatographic columns and typical operating conditions recommended in this
document are shown in Table 1, and the typical chromatogram is shown in Figure 1.
Other chromatographic columns or operating conditions that can achieve the same
separation efficiency may also be used.
A stainless-steel sintered sand core with a pore size of 2 μm~4 μm can be used as a
metal filter to filter out possible mechanical impurities in the sample and protect the
injection valve. A stainless-steel capillary (or damper valve) of appropriate length is
installed at the injection valve outlet to avoid sample vaporization, distortion, and effect
on injection repeatability.
6.4.2 Gas injection valve (quantitative tube volume. 0.5 mL)
Liquid samples can be vaporized by flash vaporization devices, or other suitable sample
vaporization methods can be used. The vaporization device shall ensure that the liquid
sample is completely vaporized, so that the gas composition is consistent with the
composition of the liquid sample, and the representativeness of the sample does not
change. When injecting samples, the sampling cylinder is in a vertical state, and the
propylene sample flows out of the sampling cylinder in a liquid state and enters the
vaporization device. The vaporized sample is injected through a six-way gas injection
valve.
7 Sampling
Sampling shall be carried out according to the safety and technical requirements
specified in GB/T 3723 and GB/T 13290.
8 Measurement steps
8.1 Setting operating conditions
According to the instrument operating instructions, install and age the chromatographic
column in the chromatograph. Then adjust the instrument to the operating conditions
shown in Table 1, and start the measurement after the instrument stabilizes.
8.2 Corrected area normalization method
8.2.1 Determination of relative volume correction factor
Use a gas injection device or a liquid injection device to inject the standard sample (5.4)
into the gas chromatograph under the conditions specified in Table 1.If a liquid
injection device is used, operate the liquid standard sample according to 6.4.1; if a gas
injection device is used, operate the liquid standard sample according to 6.4.2, or
directly connect the gas injection valve to inject the gas standard sample. Repeat the
measurement twice and measure the peak area of each hydrocarbon component.
The volume correction factor (fi) of each hydrocarbon component relative to propylene
is calculated according to formula (1).
The difference between the two determination results of the correction factor fi of each
component shall not be greater than 5% of its average value. The average value is taken
as the relative volume correction factor of the component, and three significant figures
shall be retained.
If a liquid sampling device is used to analyze the sample, and stable liquid standards of
methane, ethane, and ethylene are not available, the relative volume correction factors
of these three components can be replaced by the relative volume correction factors
measured by gaseous standards, or the theoretical relative volume correction factors can
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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