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This standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by China Petroleum and Chemical Industry Federation.
This standard is under the jurisdiction of Subcommittee on Organic Chemical Industry of National Technical Committee on Chemical of Standardization Administration of China (SAC/TC 63/SC 2).
Dimethyl carbonate for industrial use
1 Scope
This standard specifies the requirements, test methods, inspection rules as well as marking, packaging, transportation, storage and safety of dimethyl carbonate for industrial use.
This standard is applicable to dimethyl carbonate for industrial use produced from propylene carbonate or vinyl carbonate and methanol as raw material.
Molecular formula: C3H6O3
Structural formula:
Relative molecular mass: 90.10 (according to international relative atomic mass in 2011)
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated reference, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 190 Packing symbol of dangerous goods
GB/T 191 Packaging—Pictorial marking for handling of 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 4472-2011 Determination of density and relative density for chemical products
GB/T 6283 Chemical products—Determination of water—Karl·Fischer method (general method)
GB/T 6324.8 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
GB/T 23942 Chemical reagents—General rules for inductively coupled plasma atomic emission spectrometry
GB 30000.7 Rules for classification and labelling of chemicals—Part 7: Flammable liquids
JY/T 023-1996 General rules for graphite furnace atomic absorption spectrophotometry
3 Requirements
3.1 Appearance
Colorless and transparent liquid without visible impurities.
3.2 Technical indexes
Dimethyl carbonate for industrial use shall meet the technical indexes shown in Table 1.
Table 1 Technical indexes
Item Index
Electronic grade Superior Grade I
Dimethyl carbonate for industrial use, ω/% ≥ 99.99 99.9 99.5
Methanol, ω/% ≤ 0.002 0.020 0.050
Water, ω/% ≤ 0.003 0.020 0.10
Density(ρ20)/(g/cm3) 1.071 ± 0.005
Sodium/(μg/mL) ≤ 1.0 — —
Potassium/(μg/mL) ≤ 1.0 — —
Copper/(μg/mL) ≤ 1.0 — —
Iron/(μg/mL) ≤ 1.0 — —
Lead/(μg/mL) ≤ 1.0 — —
Zinc/(μg/mL) ≤ 1.0 — —
Chromium/(μg/mL) ≤ 1.0 — —
Nickel/(μg/mL) ≤ 1.0 — —
4 Test methods
4.1 Warning
Attention is drawn to the necessity for taking precautions to safeguard the health and safety of the personnel conducting the tests against the potential hazard may arise from the test specified in this standard.
Some reagents used in the analysis are toxic. Wear protective articles such as glasses and gloves during operation.
4.2 General requirement
Unless otherwise stated, only recognized analytically pure reagents and Grade III water specified in GB/T 6682 are used for the analysis.
Unless otherwise specified, the standard titration solutions, preparations and products used in the analysis shall be prepared in accordance with the requirements of GB/T 601 and GB/T 603.
4.3 Determination of dimethyl carbonate and methanol content
4.3.1 Method summary
Gas chromatography, under the selected chromatographic conditions, the specimen is gasified and passed through the chromatographic column to separate the components. Detect it with hydrogen flame detector. The content of dimethyl carbonate is calculated by area normalization method, and the content of methanol is calculated by external standard method.
4.3.2 Reagents
4.3.2.1 Hydrogen: the volume fraction is greater than 99.99%.
4.3.2.2 Nitrogen: the volume fraction is greater than 99.99%.
4.3.2.3 Air: dried and purified by silica gel or molecular sieve.
4.3.2.4 Methanol: chromatographically pure.
4.3.2.5 Dimethyl carbonate: electronic grade, the mass fraction of methanol is not greater than 0.001%.
4.3.3 Apparatus
4.3.3.1 Gas chromatograph: equipped with hydrogen flame ionization detector (FID) for capillary column analysis. The sensitivity of the whole machine shall meet the requirements of GB/T 9722, and the linear range meets the analysis requirements.
4.3.3.2 Recorder: chromatographic working station or processor.
4.3.3.3 Sample injector: 10 μL microliter syringe.
Foreword i
1 Scope
2 Normative references
3 Requirements
4 Test methods
5 Inspection rules
6 Marking, packaging, transportation and storage
7 Safety
Annex A (Normative) Typical chromatogram, relative retention value of components and determination method of correction factor for the determination of dimethyl carbonate content
