scholarly journals Steuerung der Reaktionsselektivität von Biotransformationen mittels Online-FTIR-Analytik

2014 ◽  
Vol 86 (9) ◽  
pp. 1583-1584
Author(s):  
S. Baum ◽  
M. Schilling ◽  
D. Sellin ◽  
A. Liese
Keyword(s):  
Online Ftir

Synthesis of a novel cationic asphalt emulsifier and its investigation by online FTIR spectrophotometry

2013 ◽  
Vol 41 (4) ◽  
pp. 1935-1950 ◽  
Author(s):  
Na Li ◽  
Laishun Shi ◽  
Xuli Gong ◽  
Qiyan Xu ◽  
Xin Liu ◽  
...  
Keyword(s):  
Online Ftir ◽  
Ftir Spectrophotometry

scholarly journals UV Irradiation Chlorine Dioxide Photocatalytic Oxidation of Simulated Fuchsine Wastewater by UV-Vis and Online FTIR Spectrophotometric Method

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Laishun Shi ◽  
Xiaomei Wang ◽  
Na Li ◽  
Chunlei Huai ◽  
Jie Liu
Keyword(s):  
Uv Irradiation ◽  
Chlorine Dioxide ◽  
Photocatalytic Oxidation ◽  
Oxidation Process ◽  
Degradation Process ◽  
Chemical Oxidation ◽  
Ftir Analysis ◽  
Analysis Technique ◽  
Degradation Reaction ◽  
Online Ftir

The photocatalyst TiO2/SiO2 was prepared and used for chlorine dioxide photocatalytic oxidation of simulated fuchsine wastewater under UV irradiation. The removal efficiency of fuchsine treated by photocatalytic oxidation process is higher than that of chemical oxidation process. By using UV-Vis and online FTIR analysis technique, the intermediates during the degradation process were obtained. The benzene ring in fuchsine was degraded into quinone and carboxylic acid and finally changed into carbon dioxide and water during the photocatalytic oxidation. The degradation reaction mechanism of fuchsine by UV irradiation chlorine dioxide photocatalytic oxidation was proposed based upon the experiment evidence.

scholarly journals A novel betaine type asphalt emulsifier synthesized and investigated by online FTIR spectrophotometric method

2015 ◽  
Vol 21 (1-1) ◽  
pp. 113-121 ◽  
Author(s):  
Laishun Shi ◽  
Meijie Sun ◽  
Na Li ◽  
Bochen Zhang
Keyword(s):  
Experimental Data ◽  
Lauric Acid ◽  
Chemical Structure ◽  
Ftir Analysis ◽  
Mass Ratio ◽  
Optimum Conditions ◽  
Reaction Conditions ◽  
Optimum Reaction ◽  
Ftir Technique ◽  
Online Ftir

A novel betaine type asphalt emulsifier 3-(N,N,N-dimethyl acetoxy ammonium chloride)-2-hydroxypropyl laurate was synthesized after three steps by the reaction of lauric acid, epichlorohydrin, dimethylamine and sodium chloroacetate. The optimum reaction conditions were obtained for the synthesis of the first step of 3-chloro-2-hydroxypropyl laurate. The esterification yield reaches 97.1% at the optimum conditions of reaction temperature 80?C, reaction time 6 h, feedstock mole ratio of epichlorohydrin to lauric acid 1.5, mass ratio of catalyst to lauric acid 2%. The chemical structure of the product was characterized by FTIR and 1H NMR. The first synthesis step of 3-chloro-2-hydroxypropyl laurate was monitored by online FTIR technique. The by-product was detected by the online FTIR analysis. Based upon the experimental data, a plausible reaction mechanism was proposed for the reaction. The CMC of the objective product has a lower value of 7.4?10-4 mol/L. The surface tension at CMC is 30.85 mN/m. The emulsifier is a rapid-set asphalt emulsifier.

Synthesis of Lignin Amine Asphalt Emulsifier and its Investigation by Online FTIR Spectrophotometry

2014 ◽  
Vol 909 ◽  
pp. 72-76 ◽  
Author(s):  
Xiang Tao ◽  
Lai Shun Shi ◽  
Mei Jie Sun ◽  
Na Li
Keyword(s):  
Storage Stability ◽  
Synthesis Process ◽  
Good Surface ◽  
Optimum Reaction ◽  
Ftir Technique ◽  
Lignin Amine ◽  
Online Ftir ◽  
Ftir Spectrophotometry ◽  
Modified Lignin ◽  
Optimum Reaction Condition

A novel cationic asphalt emulsifier of tetraethylenepentamine/formaldehyde modified lignin amine was synthesized by alkali lignin, tetraethylenepentamine and formaldehyde. The optimum reaction condition was obtained. The structure of the emulsifier was identified by FTIR. The synthesis process was monitored by online FTIR technique. Based upon the experimental data, a plausible reaction mechanism was proposed for the reaction. The target product has good surface activity and satisfactory emulsification effect. The prepared bituminous emulsion showed higher storage stability. The emulsifier belongs to slow-set asphalt emulsifier.

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