GB 1886.55-2015National Food Safety Standard -- Food Additives -- Butane (English PDF)

2.2 Formula

CH3-CH2-CH2-CH3

2.3 Relative molecular mass

58.12 (according to 2007 international relative atomic mass)

3.1 Sensory requirements

Sensory requirements shall comply with the requirements of Table 1.

Table 1 Sensory requirements

Project requires test methods Color colorless State gas Colorless transparent hose outlet pressure cylinders, short Valves open and close look, observe the line of color under natural light Chak and state

3.2 Physical and Chemical Indicators

Physical and chemical indicators should be consistent with the provisions of Table 2.

Table 2. Physical and chemical indicators

Item Index Test Method Butane content, w /% >= 97.0 according to GB/T 22024-2008 4.2 methods Water/(mg/kg) <= 10 GB/T Karl Fischer Coulomb Law and electric 7376-2008 stipulated Solution, which Karl Fischer Coulomb law Arbitration Law High-boiling residue/(mg/kg) <= 5 according to GB/T 4.7 in 7373-2006 Sulfide by testing in Appendix A A.3 the residue acidity by test A.4 in Appendix A Appendix A Testing method A.1 General Provisions Unless otherwise indicated in the analysis using only recognized as analytical reagents and GB/T 6682 stipulated three water.

The test method used in the standard titration solution, impurities measured by standard solution, preparations and products, not specified in other requirements, according GB/T 601, the provisions of the preparation of GB/T 602 and GB/T 603's. The solution in a solvent which does not indicate by when formulated, refers to an aqueous solution.

A.2 Identification Test A.2.1 Determination of Infrared Spectra by infrared absorption spectrophotometry, the sample spectrum and the control spectrum (see Appendix B) Comparison of the two should be basically the same.

A.2.2 Determination of vapor pressure According to GB/T 22024-2008 Determination of the method in 4.6. Sample vapor pressure (absolute pressure) 21 °C should be 213kPa.

A.3 Determination of sulfide the sample cylinder valve is opened, the formation of air appropriate to adjust the flow, do not direct the airflow to the face, the reflective part of the airflow toward the nose, sniffing its taste. No specific sample sulfide odor is by testing.

A.4 Determination of residue acidity the residue was taken after a high boiling point measurement sample, add water to dissolve 10mL, add 2 drops to 3 drops of methyl orange indicator solution (1g/L), no pink or red it is produced by the test.

Appendix B

Butane infrared spectrum Butane infrared spectrum is shown in Figure B.1.

Figure B.1 butane infrared spectrum