Sanitation Standards for Butane to be Used in Food Article 3

┌──────────┬───────────────────┐│ Item │ Standards │├──────────┼───────────────────┤│Purity │Not less than 96% (v/v) │├──────────┼───────────────────┤│Characteristics │Colorless, and flammable gasthe flavor││ │of natural gas │├──────────┼───────────────────┤│Boiling temperature │-0.5℃ │├──────────┼───────────────────┤│Solubility │One volume of water dissolves 0.15 ││ │volume; 1 volume of alcohol dissolves ││ │18 volumes; 1 volume of ether ││ │dissolves 25 volumes, at 17 ℃ and 770││ │mmHg. │├──────────┼───────────────────┤│Infrared absorption │The spectrum of a sample exhibits ││spectrum │absorptions,at approximately ││ │ 3.4 μ m(vs), 6.8 μ ││ │m(s), 7.2μm(m) and 10.4μm (m). │├──────────┼───────────────────┤│Moisture content │Not exceed 0.005 % │├──────────┼───────────────────┤│High-boiling residue│Not exceed 5 mg/kg │├──────────┼───────────────────┤│Acidity of │Add 10 mL of water to the sample, mix ││high-boiling residue│by swirling for about 30 s, add 2 ││ │drops of methyl orange TS, insert the ││ │stopper in the tube, and shake the ││ │tube vigorously. No pink or red color ││ │appears in the aqueous layer. │├──────────┼───────────────────┤│Sulfur compounds │The gas is free from the ││analysis │characteristic odor of sulfur ││ │compounds. │└──────────┴───────────────────┘