%0 Journal Article
%T The Application of NIR Process Analytical Chemistry in Studying Competitive Adsorption Process
%J American Journal of Applied Chemistry
%@ 2330-8745
%D 2019
%X With an experimental setup of near-infrared process analytical chemistry, a competitive adsorption process of orthoxylene and aniline vapor onto silica gel has been revealed in the paper. The mixture vapor of orthoxylene and aniline has been introduced into a quartz adsorption bed, which was filled with adsorbent of silica gel and monitored continuously by a near-infrared spectrometer. Based on near-infrared spectra recorded during the adsorption process and chemometrics methodologies, the competitive adsorption process has been studied completely as well as clearly: 1) at about 62 minutes the adsorption achieved its equilibrium or stable state with aniline concentration of 0.22 g/g, and without any orthoxylene; 2) othoxylene was adsorbed first, but then rapidly replaced by aniline; 3) the adsorption of aniline resulted from the hydrogen bonds between aniline¡¯s amino groups and silica gel¡¯s silanol groups while that of orthoxylene was due to physical adsorption; 4) aniline was adsorbed vertically on the silica gel but orthoxylene laid evenly; 5) some surface of silica gel was more active for adsorption than others
%K Gas-Solid Competitive Adsorption
%K Near-Infrared Spectroscopy (NIR)
%K Process Analytical Chemistry (PAC)
%K Chemometrics
%K Orthoxylene
%K Aniline
%K Silica Gel
%U http://www.sciencepublishinggroup.com/journal/paperinfo?journalid=227&doi=10.11648/j.ajac.20190703.11