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HG/T 3937-2007 (HG/T 3937-2021 Newer Version) PDF English


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HG/T 3937-2021English279 Add to Cart 3 days 1, 6-Hexanediamine for industrial use Valid
HG/T 3937-2007English130 Add to Cart 0-9 seconds. Auto-delivery. 1, 6-Hexanediamine for industrial use Obsolete
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HG/T 3937-2007: PDF in English (HGT 3937-2007)

HG/T 3937-2007 HG CHEMICAL INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 71.080.30 G 17 Registration number. 20519-2007 1,6-Hexanediamine for industrial use ISSUED ON. APRIL 13, 2007 IMPLEMENTED ON. OCTOBER 01, 2007 Issued by. National Development and Reform Commission Table of Contents Foreword ... 3  1 Scope ... 4  2 Normative references ... 4  3 Traits ... 5  4 Requirements ... 5  5 Test methods ... 5  6 Inspection rules ... 11  7 Marking, packaging, transportation, storage ... 12  8 Safety ... 13  1,6-Hexanediamine for industrial use 1 Scope This standard specifies the requirements, test methods, inspection rules, marking, packaging, transportation, storage and safety of 1,6-Hexanediamine for industrial use. This standard applies to the production, inspection and sale of 1,6- Hexanediamine for industrial use which is produced by catalytic hydrogenation of adiponitrile which is used as raw material. Molecular formula. C6H16N2 Relative molecular mass. 116.21 (according to 2005 international relative atomic mass) Structural formula. H2N(CH2)6NH2 2 Normative references The provisions in following documents become the provisions of this standard through reference in this standard. For the 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 versions of these documents are applicable. For undated references, the latest edition of the referenced document applies. GB 190-1990 Labels for packages of dangerous goods GB/T 601-2002 Chemical reagent - Preparations of standard volumetric solutions GB/T 603-2002 Chemical reagent - Preparations of reagent solution for use in test methods (neq ISO 6353-1.1982) GB/T 1250 Methods for representation and determination of limit values GB/T 3143-1982 Determination of the color of liquid chemistry product (Hazen unit - platinum-cobalt chroma) (eqv ISO 2211.1973) GB/T 3723 Sampling of chemical products for industrial use - Safety in sampling (idt ISO 3165.1976) hazardous situation. Operators shall take appropriate safety and health measures. 5.2 General provisions Unless otherwise stated, only the validated analytically pure reagents and the grade III water as specified in GB/T 6682-1992 are used in the analysis. The standard titration solution used in the test method, the standard solution for the determination of impurities, the preparation and the product shall, when no other requirements are specified, be prepared according to the provisions of GB/T 601-2002 and GB/T 603-2002. 5.3 Appearance in molten state Take appropriate amount of laboratory samples. Melt it at 60 °C. Pour it into the colorimetric tube. Place the colorimetric tube in a 42 °C ~ 45 °C water bath. Make visual observation immediately, to check whether it is a colorless transparent liquid. 5.4 Determination of 1,6-Hexanediamine content 5.4.1 Summary of method Using methyl red as an indicator, use the hydrochloric acid standard titration solution for titration. 5.4.2 Reagents 5.4.2.1 Hydrochloric acid standard titration solution. c (HCl) = 0.5 mol/L. 5.4.2.2 Methyl red indicator solution 1 g/L. 5.4.3 Analytical procedures Weigh 1.0 g ~ 14 g of laboratory sample, accurate to 0.0002 g. Place it in a 250 mL conical flask. Use 50 mL of water to dissolve it. Add 2 ~ 3 drops of methyl red indicator solution. Use the hydrochloric acid standard titration solution to titrate the solution, until the color of solution changes from yellow to red, which is used as the end point. 5.4.4 Calculation of results The mass fraction w1 of 1,6-Hexanediamine (C6H16N2), the value of which is expressed in %, is calculated according to formula (1). Where. V - The volume of the hydrochloric acid standard titration solution (5.4.2.1), in milliliters (mL); c - The exact value of the concentration of the hydrochloric acid standard titration solution, in moles per liter (mol/L); m - The value of the mass of the sample, in grams (g), M - The molar mass of the 1,6-Hexanediamine (1/2C6H16N2), in grams per mole (g/mol) (M = 58.1). Take the arithmetic mean of the results of two parallel determinations as the determination result. The absolute difference between the results of the two parallel determinations is not more than 0.1%. 5.5 Determination of chroma of aqueous solution It is performed according to the provisions of GB/T 3143-1982. Weigh (70 ± 0.1) g of laboratory sample which is in molten state. Dissolve it in water. Dilute it to 100 mL. 5.6 Determination of moisture It is performed according to the provisions of GB/T 6283-1986. Add 5 mL of glacial acetic acid into the titration cell. Place the titration cell in an ice water bath. Take the arithmetic mean of the results of two parallel determinations as the determination result. The absolute difference between the results of the two parallel determinations is not more than 15% of the arithmetic mean of the two determined values. 5.7 Determination of crystallization points It is performed according to the provisions of GB/T 7533-1993, wherein it allows the main thermometer to use the locally-immersed thermometer. Take the arithmetic mean of the results of two parallel determinations as taken as the determination result. The absolute difference between the results of the two parallel determinations is not more than 0.05 °C. 5.8 Determination of polarographic values 5.8.1 Summary of method Use the polarographic instrument to measure the substances which produce the polarographic wave near -1.5 V in the sample’s impurities. Use the Solution B / mL 100 98 97 96 5.8.4.4 Determination of polarographic wave Take 15 mL of 0# ~ 3# standard solution (i = 0, 1, 2, 3) in turn. Add it into the electrolytic tank. Lead in nitrogen for 10 min to remove oxygen. Measure the polarographic wave h (i, j) of it under the 6 sensitivities in the polarograph (j = 1, 2 ... 6). 5.8.4.5 Calculation of values The polarographic value PI(t) corresponding to the 1# ~ 3# standard solution, expressed as [mmol (isobutyraldehyde) / t (1,6-Hexanediamine)], is calculated according to formula (2). Where m - The mass of isobutyraldehyde which is added to solution A, in grams (g); T1 - The mass fraction of isobutyraldehyde (5.8.2.1), in percentage (%), Vi - The volume of the solution A which is added to the 1# ~ 3# standard solution, in milliliters (mL); M - The molar mass of isobutyraldehyde, in grams per mole (g/mol) (M = 72.107); T2 - The concentration of 1,6-Hexanediamine in solution B, in percentage (%); 500 - The volume of the volumetric flask, in milliliters (mL). The height difference of polarographic wave Δh (i, j) corresponding to 1# ~ 3# standard solution, expressed in mm, is calculated according to formula (3). Where h (i, j) - The polarographic wave height measured for the 1# ~ 3# standard solution at the jth sensitivity, in millimeters (mm). h (0, j) - The polarographic wave height measured for the 0# standard solution at the jth sensitivity, in millimeters (mm). The coefficient f (i, j) corresponding to the 1# ~ 3# standard solution is calculated fj - The arithmetic mean of the standard solution’s coefficients for the selected sensitivity. Take the arithmetic mean of the two determination results as the determination result. The absolute difference between the two determination results is not more than 12 [mmol (isobutyraldehyde) / t (1,6-Hexanediamine)]. 5.9 Determination of trans-1, 2-diaminocyclohexane (pseudo- diaminocyclohexane) The determination is carried out in accordance with the provisions of SH/T 1498.5-1997. 5.9.1 Drawing of working curve See clause 7.1 of SH/T 1498.5-1997, where the abscissa is the concentration of pseudo-diaminocyclohexane (English name for DCH) (mg/kg), with corresponding values of 0 mg/kg, 11.36 mg/kg, 22.73 mg/ Kg, 34.09 mg/kg, 45.45 mg/kg, 56.82 mg/kg. 5.9.2 Analytical procedures Weigh (4.4 ± 0.1) g of laboratory sample. Place it in a 250 mL beaker. Add about 2.5 mL of water and (5.6 ± 0.1) g of adipic acid. Place the beaker in a constant temperature water bath at (25 °C ± 0.5 °C). Add 50 mL (92→1000) of ammonia. The rest is carried out according to clause 7.2 of SH/T 1498.5-1997. 6 Inspection rules 6.1 The inspection is divided into exit-factory inspection and type inspection. 6.1.1 The type inspection items are all the items as specified in the technical requirements of Table 1. Under normal production conditions, carry out type inspection at least once every three months. Under one of the following conditions, it shall also perform the type inspection. a) When the key production process is updated. b) When there are changes in the main raw materials. c) When the production is restored after suspension. d) When there is significant difference between the results of the exit-factory inspection and the results of the previous type inspection. e) When specified in contract. 6.1.2 The exit-factory inspection items are the mass fraction and the appearance in molten state of the 1,6-Hexanediamine, the mass fraction of water, the crystallization point in the technical requirements of Table 1, which shall be inspected batch by batch. 6.2 The products which are produced in the same period and considered to be of the same quality form a batch. 6.3 Take sample according to the provisions of GB/T 6678-2003 and GB/T 6679-2003. The sampler shall be familiar with and follow the provisions of GB/T 3723. Mix the sample uniformly. Use the quartering method to reduce it to not less than 500 g. Contain it separately into 2 clean and dry mouth-grinding bottles. Attach the labels. Indicate the name, grade, batch number, production date, sampling time, etc. of product. One bottle is for inspection, the other bottle is sealed and placed in a cool dark place, retained for reference. Under the protection of nitrogen seal (volume fraction of oxygen is ≤ 0.5%), the retention period of sample is three months. 6.4 The 1,6-Hexanediamine for industrial use shall be inspected by the quality inspection department of the manufacturer according to this standard. The manufacturer shall ensure that the exit-factory products meet the requirements of this standard. Each batch of exit-factory products shall be accompanied by a quality certificate of a certain format, which contains the name of manufacturer, the name of product, the grade of product, the lot number or date of production, the number of this standard. 6.5 The inspection results shall be judged according to the comparison method of rounding-off value in GB/T 1250. If there is an indicator that does not meet the requirements of the grade, it shall re-sample from double quantity of packaging units for re-inspection. Even if only one indicator in the re-inspection results fails to comply with the requirements of this standard, the entire batch of products is degraded or considered as unqualified. 6.6 The user shall inspect the quality of the 1,6-Hexanediamine for industrial use as received in accordance with the provisions of this standard. Under the conditions of complying with the conditions of packaging, transportation and storage of this standard, from the date of exit-factory, under the protection of nitrogen seal (volume fraction of oxygen is ≤ 0.5%), the shelf life of the 1,6- Hexanediamine for industrial use is 3 months. If the warranty period is exceeded, it may make re-inspection. If the result of re-inspection meets the requirements of this standard, the product can still be used. 7 Marking, packaging, transportation, storage 7.1 Marking ......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.