HG/T 2971-1999 Test method for industrial methylamine aqueous solution HG/T2971-1999 Standard download decompression password: www.bzxz.net

1C871. 080. 30
Chemical Industry Standard of the People's Republic of China
Organic Chemical Products
(1999）
Published on 1999-06-16
Implemented on 2000-06-01
Published by the State Administration of Petroleum and Chemical Industry
Document No.: 3727—1999
HG/T2971—1999
This standard is revised from the chemical industry standard HG/T2971_983 Test method for industrial flat glue solution. This standard is compared with HG/T23711088, with only minor changes in literature and no minor changes in technology. Appendix A of this standard is the appendix of environmental certification.
This standard will replace HG/T2971-1988 from the date of implementation. This standard is issued by the Technical Supervision Department of the former Ministry of Chemical Industry of the People's Republic of China. This standard is sponsored by the Organic Subcommittee of the Technical Committee for Chemical Standardization of the People's Republic of China. The main drafting units of this standard are: Zhejiang Jiangshan Chemical General Factory; the main drafters of this standard are: Sun Jianshu, Tai Xiaofang, Huihua, Liu Jian, Zhu Daozhang. This standard was issued as a national standard in 1976 and was re-numbered in 1987. This standard is fully explained by the Organic Subcommittee of the Technical Committee for Chemical Standardization of the People's Republic of China. 1 Scope
Chemical Industry Standard of the People's Republic of China
Test method of aqueous solution of metbylamine for industrial use
Solotions of metbylamines for Industrial use-Standard test melhod
This standard specifies the test method of aqueous solution of metbylamine for industrial use. HG/T2971—1999
Replacement #H3571—1988
This standard uses the determination of aqueous solutions prepared by the continuous gas phase hydrolysis of methylamine produced by methylamine hydrolysis. 2 Referenced 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 effective. All standards will be revised. The parties using this standard should consider the possibility of using the latest versions of the following standards: 1/T691—8 Chemical Reagent Titration Analysis (Case Analysis) Standard Solution Preparation GB/TG6682:92 Specifications and Test Methods for Water in Analytical Laboratories (yISQ3696:1987) 3 Test Methods
This standard uses reagents and water. When other requirements are not specified, analytical reagents and grade 3 water that meets GB/T6682 are used. The standard used in this standard shall be prepared in accordance with the provisions of GB01 when other requirements are specified in the publication. 3.1 Determination of the external
Place 25L of the sample in a 30mL stoppered colorimetric medium and place it in the test chamber under sufficient pressure. 3.2 Determination of the content of the main glue plate Www.bzxZ.net
3.2. 1 Method Specifications
The first step is to determine the total alkalinity of methylamine aqueous solution using hydrochloric acid standard solution. The first step is to determine the impurities in the solution by gas chromatography. The total alkalinity is used to remove the proton content and the content of the tested amine is obtained: 3.2.2 Determination of total alkalinity
3.2.2.1 Reagents and solutions
3.2.2.1.1 Standard acid reduction solution: cLHC) 0.2mml/T. 3.2.2.1.2 H2O red indicator: 2B/L ethanol solution. Take 0.2Ug of base gas, add anhydrous ethanol, and dilute to 100mL with anhydrous ethanol: 3.2.2.2 Separation step
Use a 1mL syringe with a No. 5 closed needle to take 0.58 Change the water content of the sample, change the needle, plug the rubber pad, weigh the pan (accurate to U.UUC2), remove the silica gel, and insert the needle into a triangle with about 25mL of water. Insert the sample into the mold and immediately plug the head with a rubber pad. Weigh (accurate to 3.0002). The difference between the two weighings is the mass of the test sample. In the two-corner bottle, add 28% clear basic white indicator solution. Titrate the red color with hydrochloric acid marked titration solution. 3.2.2.3 Calculation of analysis results
The total alkalinity (X) expressed as a percentage of the mass of amine is calculated according to formula (II): State Petroleum and Chemical Industry Bureau 1999-06-16 Approved 2000-06-01
IIG/T 297T—1999
The actual concentration of the standard hydrochloric acid titration drop consumed in a titration. The mass of this standard hydrochloric acid is similar to the 1.00 L standard titration liquid [cFlow rate, 60mL/min
Bridge flow: 150mA;
Injection volume: 2 μT.
Paper speed: 30cm/h,
Color potential, d3mm×2m: Support: 4C7 storage support (7) batch guide!; Stationary liquid: tetra-pentylamine.
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