カスタマーログイン 0 ショッピングカート
ホーム 書籍 電子書籍 ジャーナル 参考文献と会報 著者、編集者、レビュー者 A-Z商品インデックス
Physical Chemistry of Aqueous Systems: Meeting the Needs of Industry

ISBN 印刷: 978-1-56700-034-4

ISBN オンライン: 978-1-56700-445-8

OPTICAL PROBING OF HYDROTHERMAL REACTIONS AND FLOW PATTERNS IN A HIGH-PRESSURE FLOW REACTOR

要約

We describe experiments with an optical hydrothermal flow cell capable of containing aqueous solutions at temperatures to 600°C and pressures up to 40 MPa. Hydrothermal reactions of three low-molecular-weight alcohols, ethanol, 2-propanol and 2-methyl-2-propanol, in water at temperatures from 150-500°C and a constant pressure of 34.5 MPa were observed with spontaneous Raman spectroscopy. Reactants and products were identified in situ by their spectral signatures. At temperatures up to 450°C only dehydration products could be detected, whereas at 500°C cleavage was observed. A visual flow pattern analysis in the temperature range from 300 to 450°C and at pump flow rates from 0.1 - 10 ml/min was performed. We observed asymmetric velocity profiles, which were especially pronounced at near-critical densities where reflux flow patterns developed at low flow rates. These results are consistent with model calculations based on a finite grid technique indicating that in hydrothermal flow reactors, long-range radial and axial temperature as well as density gradients exist. Within a large density/temperature region the flow behaviour in our cell can not be adequately described by common reactor models relying on symmetric flow profiles.
ホーム Begell Digital Portal Begellデジタルライブラリー ジャーナル 書籍 電子書籍 参考文献と会報 著者、編集者、レビュー者 A-Z商品インデックス 価格及び購読のポリシー Begell Houseの概要 連絡先 Language English 中文 Русский 日本語 Português Deutsch Français Español