HG/T 3481-1999 Chemical reagent 4-methyl-2-pentanone (methyl isobutyl ketone) HG/T3481-1999 Standard download decompression password: www.bzxz.net

Record number: 3875-1999
HG/T3481--1999
This standard is revised on the basis of the chemical industry standard HG/T3481-1977 "Chemical Reagent 4-Methyl-2-Pentanone". This standard provides two grades: analytically pure and chemically pure. The analytically pure non-equivalent adopts the American Chemical Association ACS standard (1993) "4-Methyl-2-Pentanone".
The main differences between this standard and ACS are as follows:
This standard has one more density than the ACS standard; the content is stricter than the ACS standard; the appearance is listed as a property. Except for free acid, the test methods of this standard adopt the general test method standards for chemical reagents that have been formulated in my country. The differences between this standard and HG/T3481-1977 are: the boiling point is cancelled; the three items of chromaticity, density and moisture are added. From the date of implementation, this standard will replace HG/T3481~--1977. This standard was proposed by the Technical Supervision Department of the former Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Chemical Reagent Branch of the National Technical Committee for Chemical Standardization. The drafting unit of this standard is Beijing Beihua Fine Chemicals Co., Ltd. The main drafter of this standard is Hao Yulin.
This standard was first issued in 1977.
Chemical Industry Standard of the People's Republic of China
Chemical reagent
4-Methyl-2-pentanone (methyl isobutyl ketone) Chemical reagent--4-Methyl-2-pentanone Indicative formula: CH, COCH, CH(CH)2
Relative molecular mass: 100.16 (according to the 1995 international relative atomic mass) 1 Scope
HG/T 3481-1999
Replaces HG/T3481-1977
This standard specifies the requirements, test methods, inspection rules, packaging and marking of the chemical reagent 4-methyl-2-pentanone (methyl isobutyl ketone).
2 Cited standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest version of the following standards. GB/T 601--1988
GB/T 603--1988
GB/T 605--1988
GB/T 606—1988
GB/T 611--1988
GB/T 619--1988
GB/T 6682- 1992
GB/T 9722--1988
GB/T 9740--1988
GB 15346--1994
3 Properties
Chemical reagents
Preparation of standard solutions for titration analysis (volume analysis) Chemical reagents
Preparation of preparations and products used in test methods Chemical reagents
General method for colorimetry (eqvISO6353-1:1982) Chemical reagents General method for determination of water content (Karl Fischer method) (eqvISO6353-1:1982) Chemical reagents
Chemical reagents
General method for density determination Methods for use (neqISO6353-1:1982) Sampling and acceptance rules
Specifications and test methods for water used in analytical laboratories (negISO3696:1987) Chemical reagents
Chemical reagents
Chemical reagents
General principles for gas chromatography
General method for determination of evaporation residue (eqvISO6353-1:1982) Packaging and marking
This reagent is a colorless and transparent liquid, which can be miscible with ethanol, ether, acetone, benzene, etc., and is slightly soluble in water. A
The specifications of 4-methyl-2-pentanone are shown in Table 1.
Table 1 Specifications of 4-methyl-2-pentanone
4-methyl-2-pentanone Content [CH.COCH.CH(CH,),], % Color, fumigation unit
Approved by the State Administration of Petroleum and Chemical Industry on 1999-06-16 Analytical pure
Chemical wool
Implementation on 2000-06-01
Density (20℃), g/mlL
Evaporation residue, %
Free acid (in CH, COOH), %
Water (H, O), %
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HG/T 3481—1999
Table 1 (Complete)
Analytical pure
0. 799~~0. 802
Chemical purity
0.799~0.802
Unless otherwise specified in this chapter, the standard titration solutions, preparations and products used shall be prepared in accordance with the provisions of GB/T601 and GB/T603; the experimental water shall comply with the specifications of grade 3 water in GB/T6682; and the samples shall be measured accurately to 0.1 mL. 5.1 4-Methyl-2-pentanone content
Determine in accordance with the provisions of GB/T9722, where: 5.1.1 Determination conditions
Detector: thermal conductivity detector.
Carrier gas and flow rate: hydrogen, 35 mL/min. Column length (stainless steel column): 3 m.
Column inner diameter: 3 mm.
Stationary phase: 15% ethylene glycol 20M coated on 101 white diatomaceous earth carrier [0.18mm~～0.25mm (60 mesh～80 mesh)], aged at 180℃ for more than 4h.
Column temperature: 80℃.
Vaporization chamber temperature: 140℃.
Detection chamber temperature: 140℃.
Injection volume: 4μL.
Effective plate height of chromatographic column: Het≤5.5mm. Asymmetry factor: f≥0.68.
Resolution of difficult-to-separate pairs of substances: R≥1.5 (2-hexanone and 4-methyl-2-pentanone). Relative retention values ​​of components relative to the main body: r2-hexanone, 4-methyl-2-hydroxy-2-oxadiazole = 1.45; r4-methyl-3-hydroxy-2-oxadiazole, 4-methyl-2-hydroxy-2-oxadiazole = 2.03. 5.1.2 Quantitative method
Determine according to 8.2 of GB/T9722-1988. 5.2 Chroma
Determine according to 8.2 of GB/T605.
5.3 Density
Determine according to 5.1 of GB/T611-1988. 5.4 Evaporation residue
Take 25mL (20g) sample and determine according to GB/T9740. 5.5 Free acid
Measure 25mL of ethanol (anhydrous ethanol), add 2 drops of 10g/L phenolphthalein indicator solution, and titrate with sodium hydroxide standard titration solution [c(NaOH)=0.02mol/L] until the solution turns pink, and keep it for 30 seconds. Add 25mL (20g) of sample. If the pink color disappears, titrate with sodium hydroxide standard titration solution [c(NaOH)=0.02mol/L] until the solution turns pink, and keep it for 30 seconds. The content of free acid (in terms of CH:COOH) expressed as a mass percentage (X) is calculated as follows: X (%) =
V. c X 60. 05
m X 1 000
HG/T 3481-- 1999
Wherein: V—volume of sodium hydroxide standard titration solution, mL, concentration of sodium hydroxide standard titration solution, mol/L; molar mass of acetic acid [M(CH,COOH)], g/mol; 60.05-
m——mass of sample, g.
5.6 Moisture
Determine according to the provisions of GB/T606. Wherein: 10 mL (8 g) sample is measured and 10 mL pyridine is used as solvent. 6 Inspection rules
Sampling and acceptance shall be carried out according to the provisions of GB/T619. Packaging and marking
Packaging, storage and transportation shall be carried out in accordance with the provisions of GB15346, and marking shall be given, including: Packing unit: Class 4;
Inner packaging form: NB-20, NBY-20, NB-21, NBY-21, NB-23, NBY-23, NB-24, NBY-24, NB-27, NBY-27, NB-28, NBY-28, NB-29, NBY-29; Isolation material: GC-2, GC-3, GC-4;
Outer packaging form: WB-1;
The label should indicate "flammable items".
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