1. Adsorption Characteristics of Volatile Organic Compounds on Used Coffee Grounds Based on the Breakthrough Curves
- Subjects
吸着量 ,コーヒー抽出カス ,volatile organic compounds ,破過曲線 ,揮発性有機化合物 ,coffee grounds ,breakthrough curve ,adsorption amount - Abstract
コーヒー抽出後の豆カス(コーヒー抽出カス)に対する揮発性有機化合物(VOC)の吸着特性を調べた.VOC蒸気の吸着破過実験装置を製作し,約100 ppmのVOC蒸気を含む窒素をコーヒー抽出カス充填セルに通気し た.通気後の窒素中の蒸気を水素炎イオン化検出器付きガスクロマトグラフで経時的に分析した.得られた分析値 と時間から破過曲線を作成し,図積分によりコーヒー抽出カスの各揮発性有機化合物の吸着量を算出した.14種類 の有機溶剤について実験した結果,吸着量は沸点が高い物質ほど大きくなる傾向が認められた.また,メタノールや トルエンの吸着量については,実験に使用したコーヒー抽出カスに含まれている水分が影響することがわかった., We investigated the adsorption characteristics of volatile organic compounds (VOCs) on the surface of coffee beans after extraction (coffee grounds). Temperature-controllable adsorption equipment of VOC vapor was manufactured, and nitrogen gas containing about 100 ppm of VOC vapor was introduced into a coffee extraction residue. The air in the downstream was analyzed with a gas chromatograph equipped with a flame ionization detector over a period of time. A breakthrough curve was obtained from the analysis of values and time, and the adsorbed amount of each volatile organic compound on the coffee grounds was calculated from a graphical integration of the breakthrough curve. Fourteen VOCs were tested, and the adsorbed amount tended to increase with increases in the boiling point of the VOCs. It was also found that the adsorbed amount of methanol and toluene was affected by the water content in the coffee grounds used in the experiment.
- Published
- 2019