GB 338-2011 PDF in English
GB 338-2011 (GB338-2011) PDF English
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[GB/T 338-2011] Methanol for industrial use
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Standards related to: GB 338-2011
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GB 338-2011: PDF in English GB 338-2011
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.080.60
G 16
Replacing GB 338-2004
Methanol for industrial use
ISSUED ON. DECEMBER 05, 2011
IMPLEMENTED ON. AUGUST 01, 2012
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Requirements ... 6
4 Test methods ... 7
5 Inspection rules ... 11
6 Marking, packaging, transportation and storage ... 12
7 Safety ... 12
Annex A (Informative) Contrast list between the chapters and articles
number in this Standard and those in ASTM D1152.2006 ... 14
Annex B (Normative) Calculation of the mass fraction of methanol ... 15
Annex C (Informative) Correction calculation of full immersion
thermometer and mercury manometer ... 16
Annex D (Normative) Determination of ethanol content in methanol for
industrial use – Gas chromatography ... 17
Foreword
Provisions in Chapter 6.1 of this Standard are mandatory, and the others are
recommendatory.
This Standard is drafted according to the rules given in GB/T 1.1-2009.
This Standard replaces GB 338-2004 Industrial Methanol. Compared with GB 338-2004,
the main technical changes in this Standard are as follows.
— Modified the preparation method of this Standard colorimetric solution used for the
potassium permanganate time test (see Chapter 4.7 of this edition; and Chapter 4.4
of Edition 2004);
— Added the correction formula for the readings of the full immersion thermometer and
the mercury barometer used in the boiling range determination method (see Annex
C of this edition);
— Modified the test method for the determination of ethanol content (see Chapter 4.14,
Annex D of this edition; and Chapter 4.11 of Edition 2004);
— Modified the factory inspection items (see Chapter 5.1 of this edition; and Chapter
5.1 of Edition 2004).
Using re-drafting method, this Standard modifies-adopts the American Society for Testing
Materials standard ASTM D1152.2006 Methanol. Compared with ASTM D1152.2006,
there are adjustments on the structure. Annex A lists out the Contrast List between
chapter and article number in this Standard and ASTM D1152.2006. The technical
differences and their reasons between this Standard and the ASTM D1152.2006 are as
follows.
— Indicators are divided into superior products, first-class products and qualified
products (see Chapter 3.2). Which is determined based on the classification
guideline of the relevant industrial products in China;
— Added the water miscibility item and the ethanol content item (see Chapter 3.2).
This is to strictly control the product quality;
— The color scale, boiling range, acid or alkali and other indicators of the superior
products are better than those specified in ASTM D1152.2006 (see Chapter 3.2);
— In addition to the use of the method specified in the ASTM D1152.2006 for the
sulfuric acid washing test, other test methods all adopt the national standards for
products testing method of China (see Chapter 4).
Methanol for Industrial Use
1 Scope
This Standard specifies the requirements, test methods, inspection rules, marking,
packaging, transportation, storage and safety of the methanol for industrial use.
This Standard applies to the methanol for industrial use compounded by coal, natural gas,
light oil and heavy oil as the materials.
Molecular formula. CH4O
Relative molecular mass. 32.042 (according to the international relative atomic mass in
2007)
2 Normative references
The articles contained in the following documents have become part of this Standard
when they are quoted herein. For the dated documents so quoted, all the modifications
(including all corrections) or revisions made thereafter shall be applicable to this Standard.
GB 190 Packing symbol of dangerous goods
GB/T 601 Chemical reagent - Preparations of standard volumetric solutions
GB/T 603 Chemical reagent - Preparations of reagent solutions for use in test methods
(GB/T 603-2002, ISO 6353-1.1982, NEQ)
GB/T 3143 Color determination method of liquid chemicals (Hazen unit;
Platinum-cobalt scale)
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 6283-2008, ISO 760.1978, NEQ)
GB/T 6324.1 Test method of organic chemical products - Part 1. Water miscibility test
of liquid organic chemical products
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
6324.2-2004, ISO 759.1981, MOD)
Note. See Annex B when there is a need to calculate the mass fraction of methanol.
a Including 64.6°C ± 0.1°C.
4 Test methods
4.1 Warning
Some processes specified by the test method may lead to dangerous situations, so
the operator shall take appropriate safety and protective measures.
4.2 General provisions
Unless otherwise specified, only confirmed analytically pure reagent and Grade-3 water
met the GB/T 6682 are used in the analysis.
If there is no other requirements noted, the standard titration solution, preparations and
products used in the analysis shall be prepared in accordance with provisions of GB/T 601
and GB/T 603.
4.3 Determination of the characters
Add the specimens in the colorimetric tube with a plug; carry out a sensory detection
under fluorescent lamp or daylight.
4.4 Determination of the color scale
It shall be conducted according to the method specified in GB/T 3143.
4.5 Determination of density
It shall be conducted according to the pycnometer method specified in GB/T 4472. Other
test methods that can meet the analysis requirements can also be used. In the range of
15°C - 35°C, the temperature correction coefficient of the specimen density is 0.000 93 g /
(cm3 • °C).
Take the arithmetic mean value of two parallel determination results as the report results.
The absolute difference value of two parallel determination results shall not be greater
than 0.0005 g/cm3.
4.6 Determination of boiling range
It shall be conducted according to the method specified in GB/T 7534. Distillation flask is
of 100mL; indication range of the thermometer is 50°C - 70°C, with the division value of
0.1°C. For the correction of the full immersion thermometers and mercury manometer, see
Annex C.
4.7 Potassium permanganate test
It shall be conducted according to the provisions of visual colorimetric method in GB/T
6324 3-2011. Among which, the specimen volume is of 50mL; the addition of the
potassium permanganate solution is 1mL; temperature is controlled at 15°C ± 0.5°C; the
colorimetric method is lateral observation.
4.8 Water miscibility test
It shall be conducted according to the method specified in GB/T 6324.1. The proportions
of the selected specimen and the water miscibility respectively are. 1 + 3 (superior
products), 1 + 9 (first-class products).
4.9 Determination of the moisture
It shall be conducted according to provisions of GB/T 6283.
Take the arithmetic mean value of two parallel determination results as the determination
results. The absolute difference value of two parallel determination results shall not be
greater than 0.01%.
4.10 Determination of acid or alkali content
4.10.1 Method summary
The specimen is diluted by water that does not contain carbon dioxide, with the
bromothymol blue as indicator; for the acidic specimen, the sodium hydroxide standard
titration solution is used to titrate the free acid, and for the alkaline specimen, the sulfuric
acid standard titration solution is used to titrate the free alkali.
4.10.2 Reagents
4.10.2.1 Sodium hydroxide standard titration solution. c(NaOH)=0.01 mol/L.
4.10.2.2 Sulfuric acid standard titration solution. c(1/2H2SO4) = 0.01 mol/L.
4.10.2.3 Bromothymol blue indicating liquid. 1 g/L.
4.10.2.4 Water without carbon dioxide.
4.10.3 Apparatuses
Burette. 10mL, with a scale division of 0.05mL.
4.10.4 Analytical procedures
4.10.4.1 The specimen is diluted by isometric water that does not contain carbon dioxide;
add 4 - 5 drops of bromothymol blue indicating liquid to identify; in case the specimen is
yellow, determine the acid contents; in case the specimen is blue, and determine the alkali
contents.
5.4 Sampling shall be conducted according to the provision of GB/T 6678 and GB/T 6680
that the liquid is flowing under the normal temperature; the total amount of specimen shall
not be less than 2L. After mixing the specimen thoroughly, respectively pack them in two
dry and clean glass bottles with ground stopper; one bottle is used for partition test,
another for reserved inspection.
5.5 The determination of test results shall be conducted according to rounding-off value
comparison method in GB/T 8170. For any indicator that does not meet the requi...
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Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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