Sanitation Standards for Butane to be Used in Food

The Standards are prescribed in accordance with the provisions of Article 17 of the Act Governing Food Sanitation.

Butane as referred to these standards including both n-butane (CAS Reg. No. 106-97-8) and isobutane (CAS Reg. No. 75-28-5). The formula of the chemical is indicated as C4H10, and its molecular weight is 58.12.

┌──────────┬───────────────────┐│ 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. │└──────────┴───────────────────┘

┌──────────┬───────────────────┐│ Item │ Standards │├──────────┼───────────────────┤│Purity │Not less than 94% (v/v) │├──────────┼───────────────────┤│Characteristics │Colorless, and flammable gas the ││ │flavor of natural gas │├──────────┼───────────────────┤│Boiling temperature │-11 ℃ │├──────────┼───────────────────┤│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 10.9μm (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. │└──────────┴───────────────────┘

The Standards shall be implemented on the date of promulgation.