GB/T 3729-2023 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 3729-2023 | English | 245 |
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n-Butyl acetate for industrial use
| Valid |
| GB/T 3729-2007 | English | 279 |
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n-Butyl acetate for industrial use
| Obsolete |
| GB/T 3729-1991 | English | 199 |
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n-Butyl acetate for industrial use
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GB/T 3729-2023: n-Butyl acetate for industrial use---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/GBT3729-2023
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
ICS 71.080.70
CCS G 17
Replacing GB/T 3729-2007
n-Butyl acetate for industrial use
Issued on: SEPTEMBER 7, 2023
Implemented on: APRIL 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 Technical requirements... 6
5 Test methods... 7
6 Inspection rules... 12
7 Marking, packaging, transportation and storage... 13
Appendix A (Informative) Typical chromatogram, retention time and relative
retention value, relative mass correction factor of each component... 15
Appendix B (Informative) Safety... 18
n-Butyl acetate for industrial use
WARNING -- This document does not indicate all possible safety issues. Users are
responsible for taking appropriate safety and health measures and ensuring that
the conditions specified by relevant national laws and regulations are met.
1 Scope
This document specifies the technical requirements, test methods, inspection rules and
marking, packaging, transportation and storage of n-butyl acetate for industrial use.
This document applies to n-butyl acetate for industrial use produced by esterification
of acetic acid and n-butanol in the presence of a catalyst.
NOTE. The molecular formula of n-butyl acetate is C6H12O2, the structural formula is
CH3COO(CH2)3CH3, and the relative molecular mass is 116.16 (according to the 2022 International
Relative Atomic Mass).
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 190 Packing symbol of dangerous goods
GB/T 601 Chemical reagent - Preparations of reference titration solutions
GB/T 603 Chemical reagent - Preparations of reagent solutions for use in test
methods
GB/T 3143 Colour determination method of liquid chemicals (Hazen unit -
Platinum-cobalt scale)
GB/T 3723 Sampling of chemical products for industrial use - Safety in sampling
GB/T 4472 Determination of density and relative density for chemical products
GB/T 6283 Chemical products - Determination of water Karl • Fischer method
(general method)
GB/T 6324.2 Test method of organic chemical products - Part 2.Determination of
dry residue after evaporation on a water bath for volatile organic liquids
GB/T 6324.8 Test methods of organic chemical products - Part 8.Determination of
water of liquid products – Carl • Fischer coulometric method
GB/T 6678 General principles for sampling chemical products
GB/T 6680 General rules for sampling liquid chemical products
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 8170 Rules of rounding off for numerical values & expression and judgment
of limiting values
GB/T 9722 Chemical reagent - General rules for the gas chromatography
3 Terms and definitions
There are no terms or definitions that require definition in this document.
4 Technical requirements
The n-butyl acetate for industrial use shall comply with the requirements of Table 1.
5 Test methods
WARNING -- Some test procedures specified in the test methods may lead to
dangerous situations. Operators shall take appropriate safety and protective
measures.
5.1 General provisions
The reagents and water used in this document, unless otherwise specified, refer to
analytical reagents and Grade III water specified in GB/T 6682.
The standard titration solutions, preparations and products used in the test shall be
prepared in accordance with the provisions of GB/T 601 and GB/T 603 unless otherwise
specified.
5.2 Determination of appearance
Add an appropriate amount of sample into a stoppered colorimetric tube and observe
visually under natural light or fluorescent light.
5.3 Determination of chromaticity
Carry out the test according to the method specified in GB/T 3143.
5.4 Determination of n-butyl acetate, n-butanol, benzene, methylbenzene,
ethylbenzene and xylene
5.4.1 Principle of the method
Using the capillary column gas chromatography, under selected working conditions, the
sample is vaporized and then passed through the chromatographic column to separate
the components, which are detected by a hydrogen flame ionization detector and
quantified by the corrected area normalization method.
5.4.2 Reagents
5.4.2.1 Nitrogen. with a volume fraction of not less than 99.999%, purified by silica gel
and deoxygenation tube.
5.4.2.2 Hydrogen. with a volume fraction of not less than 99.999%, purified by silica
gel or molecular sieve.
5.4.2.3 Air. Purified by silica gel or molecular sieve.
5.4.2.4 n-Butanol, benzene, methylbenzene, ethylbenzene, p-xylene, o-xylene, m-
xylene. chromatographically pure.
m -- the mass of the sample, in grams (g).
The arithmetic mean of the results of two parallel measurements is taken as the
measurement result, and the absolute difference between the two parallel measurement
results shall not be greater than 0.001%.
5.7 Determination of density
The density is measured according to the density meter method in GB/T 4472.In the
range of 0 °C~40 °C, the temperature correction coefficient of the sample density is
0.0010 g/(cm3 • °C).
The arithmetic mean of the results of two parallel measurements is taken as the
measurement result. The absolute difference between the two parallel measurement
results shall not be greater than 0.0005 g/cm3.
5.8 Determination of evaporation residue
The test is carried out according to the method specified in GB/T 6324.2, with a sample
size of 200 g.
The arithmetic mean of the results of two parallel measurements is taken as the
measurement result, and the absolute difference between the two parallel measurement
results shall not be greater than 0.0005%.
6 Inspection rules
6.1 Inspection is divided into factory inspection and type inspection. Factory inspection
items include appearance, chroma, n-butyl acetate, n-butyl alcohol, moisture and acidity,
which shall be inspected batch by batch. Type inspection items include all items in Table
1.Under normal production conditions, type inspection shall be carried out at least once
every 6 months. Type inspection shall also be carried out in any of the following
situations.
a) Any key production process is updated;
b) There are changes in the main raw materials;
c) The production is resumed after the suspension;
d) The factory inspection results are significantly different from the previous type
inspection results.
6.2 Under the condition that raw materials and processes remain unchanged, the actual
batches of products produced continuously are called a group batch, but the time for
several production batches to form an inspection batch usually does not exceed 24 hours.
6.3 Product sampling shall be carried out in accordance with the provisions of GB/T
3723, GB/T 6678 and GB/T 6680.The sample quantity shall always meet the needs by
analysis and sample retention. After the samples are fully mixed, they shall be divided
into two clean, dry glass bottles with ground stoppers. Label them and indicate the
product name, batch number, sampling date, and name of the sampler. One bottle is
used for analysis and inspection, and the other is kept for future reference.
6.4 The test results shall be determined according to the rounded value comparison
method in GB/T 8170.If one of the indicators in the test results does not meet the
requirements, the barreled products shall be re-sampled from 2 times the number of
packaging units for re-testing, and the canned products shall be re-sampled in double
the sample quantity for re-testing. Even if only one indicator in the re-test results does
not meet the requirements, the entire batch of products shall be unqualified.
7 Marking, packaging, transportation and storage
7.1 Marking
7.1.1 The packaging containers of n-butyl acetate for industrial use shall be clearly
marked with the name and address of the manufacturer, product name, batch number or
production date, net content, and this document number. The packaging containers shall
also have the "flammable liquid" mark in accordance with GB 190.
NOTE. For safety information on this product, see Appendix B.
7.1.2 The manufacturer shall ensure that each batch of products leaving the factory
complies with the requirements of this document and shall be accompanied by a quality
certificate, which shall include the manufacturer's name and address, product name,
production date or batch number, product model and this document number, etc.
7.2 Packaging
The n-butyl acetate for industrial use shall be packaged in clean, dry tank trucks or steel
drums, and the drum mouth shall be sealed with a sealing ring.
The n-butyl acetate for industrial use may also be packaged and filled in other
containers approved by relevant national departments and capable of ensuring safety,
and the relevant safety supervision and management regulations of the container shall
be implemented.
7.3 Transportation
Transportation and loading and unloading shall be carried out in accordance with the
regulations on the transportation of dangerous goods.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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