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GB/T 7534-2004 (GB/T7534-2004)

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GB/T 7534-2004: PDF in English (GBT 7534-2004)
GB/T 7534-2004
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.080.01
G 15
Replacing GB/T 7534-1987
Volatile organic liquids for industrial use -
Determination of boiling range
(ISO 4626.1980, Volatile organic liquids - Determination of boiling
range of organic solvents used as raw materials, MOD)
ISSUED ON. MARCH 15, 2004
IMPLEMENTED ON. DECEMBER 1, 2004
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 Terms and definitions ... 5 
4 Method summary ... 6 
5 Apparatus ... 6 
6 Safety and precautionary measures ... 11 
7 Apparatus assembly and test preparation ... 12 
8 Analysis procedure ... 13 
9 Factors causing superheating and operating precautions ... 14 
10 Result calculation ... 16 
11 Precision ... 16 
12 Test report ... 17 
Annex A (Informative) Contrast of the section numbers of this Standard and
ISO 4626.1980 ... 19 
Annex B (Informative) Technical differences between this Standard and ISO
4626.1980 and the corresponding causes ... 20 
Annex C (Informative) Normal boiling points and corrected values of the
boiling points with pressure ... 21 
Foreword
This Standard uses ISO 4626.1980 Volatile organic liquids - Determination of
boiling range of organic solvents used as raw materials (EN) after modification.
This Standard was redrafted in accordance with ISO 4626.1980. The contrast
table for section numbers of this Standard and ISO 4626.1980 is listed in Annex
A.
Taking China’s national situation into consideration, this Standard has made
some modifications when using ISO 4626.1980. The relevant technical
differences have been compiled into the text, and have been identified by
vertical single lines in the margins of the terms to which they relate. The list of
the technical differences between this Standard and ISO 4626.1980 and
corresponding reasons have been given in Annex B for reference.
This Standard replaces GB/T 7534-1987 Volatile organic liquids for industrial
use - Determination of boiling range.
Compared with GB/T 7534-1987, the major changes in this Standard are as
follows.
— MODIFY the boiling range applicable to this Standard from (50 ~ 200) °C
to (30 ~ 300) °C (SEE Paragraph 1 of 1987 edition and Chapter 1 of this
edition);
— ADD 200mL distillation flask (SEE Article 3.1 of 1987 edition and Article
5.1 of this edition);
— ADJUST the dimensions of the thermometer (SEE Article 3.2 of 1987
edition and Article 5.2 of this edition);
— ADD the distillation apparatus diagram for the electric heater in use (SEE
Figure 3);
— ADD the safety and precautionary measures, factors causing
superheating and operating precautions (SEE Chapters 6 and 9);
— ADJUST the requirements for the temperature of cooling water (SEE
Chapter 4 of 1987 edition and Article 7.4 of this edition);
— ADD the requirements for the temperature of test pieces (SEE Article 7.4);
— MODIFY the total recovery volume from not less than 98mL to not less
than 97% (volume fraction) for non-viscous liquid and not less than 95%
(volume fraction) for viscous liquid (SEE Chapter 5 of 1987 edition and
Article 8.6 of this edition);
— ADD the compound category to the table for the corrected values of the
boiling points with pressure (SEE Annex C);
— The precision of method is given (SEE Article 10.4).
The Annexes A, B and C in this Standard are informative annexes.
This Standard was proposed by China Petroleum and Chemical Industry
Association (changed to “China Petroleum and Chemical Industry Federation”
on May 10, 2010).
This Standard shall be under the jurisdiction of the Subcommittee of Organic
Chemical Industry of the National Technical Committee for Standardization of
Chemistry (CSBTS/TC 63/SC 2).
Drafting organization of this Standard. SINOPEC Beijing Research Institute of
Chemical Industry.
Main drafters of this Standard. Guo Yanling and Dong Wei.
This Standard was first released in March 1987.
Volatile organic liquids for industrial use -
Determination of boiling range
Warning - This Standard does not address all safety issues related to the
use of this Standard. It is the user’s responsibility to take appropriate
safety and health measures and to ensure compliance with the relevant
national regulations. The description of relevant safety and precautionary
measures is provided in Chapter 6.
1 Scope
This Standard specifies the method for determining the boiling range of the
volatile organic liquids.
This Standard is applicable to the organic liquids that boil between 30°C and
300°C at normal pressure, and that are chemically stable during the distillation
(such as hydrocarbons, esters, alcohols, ketones, ethers and similar organic
compounds).
2 Normative references
The provisions in the following documents become the provisions of this
Standard through reference in this Standard. For dated references, the
subsequent amendments (excluding corrections) or revisions do not apply to
this Standard. However, parties who reach an agreement based on this
Standard are encouraged to study if the latest editions of these documents are
applicable. For undated references, the latest editions apply to this Standard.
GB/T 3723 Sampling of chemical products for industrial use - Safety in
sampling (GB/T 3723-1999, idt ISO 3165.1976)
3 Terms and definitions
The following terms and definitions are applicable to this Standard.
3.1 Initial boiling point
It refers to the temperature observed (corrected if necessary) at the moment
when the first drop of condensate falls from the tip of the condenser tube during
a distillation carried out under standardized conditions.
3.2 Dry point
It refers to the temperature observed (corrected if necessary) at the moment of
vaporization of the last drop of liquid at the bottom of the distillation flask during
a distillation carried out under standardized conditions, disregarding any liquid
on the side of the distillation flask and on the thermometer.
3.3 Boiling range
It refers to the temperature interval between the initial boiling point and the dry
point.
3.4 End point, final boiling point
It refers to the maximum temperature observed (corrected if necessary) during
the final phase of a distillation carried out under standardized conditions.
4 Method summary
DISTILL 100mL of test piece under prescribed conditions. Systematically
OBSERVE the thermometer readings and volumes of condensate. READ the
initial boiling point and the dry point from the thermometer. OBTAIN the boiling
range of the test piece being tested by the calculation of the observed data.
CORRECT the results to standardized conditions.
5 Apparatus
5.1 Distillation flask
It is made of heat-resistant glass, with a capacity of 100mL or 200mL,
conforming to the dimensions shown in Figure 1.
Note. Superheating of liquid in a new flask may be prevented by depositing a small amount of carbon at
the bottom of the flask, which may be accomplished by heating and decomposing a pinch of tartaric acid
at the bottom of the flask. The flask is then prepared for use by washing with water, rinsing with acetone,
and drying (An exception is made for diacetone alcohol. in order to avoid an erratic value for the initial
boiling point, the distillation flask shall be clean and free of any residual carbon decomposition product).
5.2 Thermometer
Mercury-in-glass type, nitrogen-filled, enamel-backed, and complying with the
requirements in Table 1. If using a full-immersion thermometer, the division
value shall be 0.1°C or 0.2°C, and an auxiliary thermometer shall be used to
correct the mercury column of the part above the plug of the master
thermometer during distillation. The auxiliary thermometer is generally of
6.2 Certain solvents and chemical intermediates, particularly ethers and
unsaturated compounds, may form peroxides during storage. These peroxides
may present an explosion hazard when these chemicals are distilled, especially
as the dry point is approached. Peroxides shall be pretested, or appropriate
precautions shall be taken, if necessary.
Note. Test for peroxides. ADD (0.5 ~ 1.0) mL of the test piece to be tested to an equal volume of glacial
acid to which has been added about 100mg of sodium or potassium iodide crystals. A comparatively yellow
color indicates a low and a brown color a high concentration of peroxide in the test ...
......
 
(Above excerpt was released on 2016-12-24, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT7534-2004