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STUDIES ON KINETICS OF DESORPTION OF CO_2 FROM HOT CARBONATED POTASH SOLUTION WITH DETA (DIETHYLENETRIAMINE) AS A CATALYST

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Chinese Journal of Chemical Engineering 1989年第1期 59-72页

作者：李道棠涂晋林施亚钧 Shanghai Jiao Tong University Shanghai East China Institute of Chemical Technology Shanghai

Under atmosphe（）e press（）ne, rates of deseption of CO（） from unmod（）ed carbonated potash solutior （27 wt%）and modified carbonated potash solution（27 wt%） containing DETA as a catalyst, have been measured in a laboratory stirred reactor. Experiments were carried out with concentrations of DETA from 0—40g/L and temperatures from 90—104℃The results, show that the desorption of CO2 from hot carbonated solutions with and without the addition of DETA, may be considered a pseudo-first order reversible reaction, and that the desorption of CO2 from carbonated potash solution calalysed by DEIA is in agreement with the mechanism of simultancous reactions of CO2 with amine molecules and with hydroxyl ions in solution. Mathematical models for desorptions rate cocflicient have been cstablished, and optimum concentration of DETA is proposed.

关键词： DETA desorption hydroxyl reversible stirring volatile removed boiling maintained deviation

EFFECT OF WATER ON THE OXIDATION OF METHANOL OVER ELECTROLYTIC SILVER

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分子催化 1990年第S1期4卷 85-89页

作者： Zhou Qinwei and Deng Jingfa(Chemistry Department, Fudan University, Shanghai, China)

The mechanism of methanol adsorption induced by oxygen and the effect of water on the methanol oxidation on electrolytic silver have been studied by ultra-high vacuum temperature programmed reaction spectroscopy(TPRS), transient response method and isotopic exchange experiment. It has been found that oxygen adsorbed on silver can greatly promote methanol adsorption and can also react with methanol to produce water. Experimental results show that oxygen in the water comes from the adsorbed oxygen and hydrogen from the methyl and the hydroxyl in methanol. It has also been found that there exists competitive adsorption between water and oxygen on silver and water can increase the selectivity of methanol oxidation to formaldehyde. This result is consistent with the catalytic activities.

关键词： methanol formaldehyde silver competitive adsorbed selectivity electrolytic suddenly programmed hydroxyl

Development of Preparation Method for Microencapsulating Uycalyptus Oil Containing Fine Aqueous Droplets by Use of Interfacial Condensation Reaction between Hydroxy Propyl Methyl Cellulose and Tannic Acid

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Journal of Cosmetics, Dermatological Sciences and Applications 2014年第4期4卷 219-227页

作者： Hiroyuki Sato Yoshinari Taguchi Masato Tanaka Graduate School of Science and Technology Niigata University Niigata Japan

It was tried to develop the preparation method for microencapsulating the uycalyptus oil containing fine aqueous droplets by using the interfacial condensation reaction between hydroxyl propyl methyl cellulose and tannic acid. Uycalyptus oil containing fine aqueous droplets was dispersed in the continuous water phase to form the (W/O)/W emulsion. Tannic acid and hydroxyl propyl methyl cellulose were dissolved in the inner aqueous droplets and in the outer continuous water phase, respectively. Tannic acid transferred through the oil phase from the inner water droplets to the interface between the oil phase and the continuous water phase and then, reacted with hydroxyl propyl methyl cellulose. In the experiment, the concentrations of hydroxyl propyl methyl cellulose and tannic acid were mainly changed stepwise. The uycalyptus oil containing the fine water droplets could be microencapsulated satisfactorily. It was found that the microcapsules were composed of the gelated hydroxyl propyl methyl cellulose film as the shell, the fine aqueous droplets as the first core and the oil droplet as the second core.

关键词： Microcapsule Uycalyptus Oil Multiple Emulsion Interfacial Condensation Reaction hydroxyl Propyl Methyl Cellulose Tannic Acid

Plasma-Assisted Chemical Vapor Deposition of Titanium Oxide Layer at Room-Temperature

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Journal of Crystallization Process and Technology 2014年第1期4卷 20-26页

作者： Satoshi Yamauchi Hiromi Suzuki Risa Akutsu Department of Biomolecular Functional Engineering Ibaraki University Hitachi Japan.

Plasma-assisted chemical vapor deposition (PCVD) at pressure as low as 3 mtorr using titanium-tetra-isopropoxide (TTIP) and oxygen mixed gas plasma generated by 13.56 MHz radio frequency power (RF-power) below 70 W were applied to deposit titanium-oxide layer at temperature under 40°C. Plasma optical emission spectroscopy and FTIR indicated that density of OH group in the amorphous layer was related to the density of OH or H2O in the plasma and the species was formed on electrode to induce the RF-power. Hydrophilicity on the layer was dependent on the density of chemisorbed OH, but was degraded by the excess OH. The PCVD-TiOx coating was demonstrated on polyethylene terephthalate and showed good hydrophilic property with the contact angle of water about 5°.

关键词： PCVD Amorphous Titanium-Oxide FTIR hydroxyl Hydrophilicity

A NEW STRONG CHARACTERISTIC OPTICAL ABSORPTION ATTRIBUTED TO AN INITIAL PHOTOPRODUCT OF TYROSINE AND PHENOL

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Chinese Science Bulletin 1983年第8期28卷 1106-1111页

作者：沈恂庞素珍马海官 Institute of Biophysics Academia Sinica Beijing Institute of Biophysics Academia Sinica Beijingn early 1960s Land and Grossweiner et al. did first studies on the initial photoproducts of phenol and tyrosine using flash photolysis method. The photolitic mechanism of them has been extensively investigated since 1970. It is generally recognized that when tyrosine or phenol is irradiated by UV-light the phenoxyl-type

In early 1960s, Land and Grossweiner et al. did first studies on the initial photoproducts of phenol and tyrosine using flash photolysis method. The photolitic mechanism of them has been extensively investigated since... 详细信息

关键词： phenol Phenol irradiated saturated benzene notably break hydroxyl solute saturation

The Thermal Stability and Adsorbability of the Mechylated Silica Gel

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高等学校化学学报(英文版) 1987年第2期 50-55页

作者： Zhao Zhenguo,Shao Changsheng,Qin Shoufeng,Lin Yao,Lin ZhenkunGu Tiren(Department of Chemistry,Peking University,Beijing)

The methylated silica gel has been produced by the reaction between the surface silanol groups and Clsi(CH3)3 *** adsorption isotherms of acetic acid from carbon tetrachloride onto silica gel and emthylated silica gel heated at various temperatures have been determined at 25℃,and the above mentioned silica gels have been studied by TC and *** results indicate:(1) The adsorption of acetic acid from carbon tetrachloried onto methylated silica gel decreased greatly,probably because the concentration of the free hydroxyl groups for methylated silica gel decreased greatly as the IR shows.(2) As the methylated surface was destroyed at 450℃,the adsorption ability was restored when the methylated silica gel treated at>500℃.(3) So long as the methylated silica gel was treated at high temperature,the adsorption ability could be restored owing to that surface free hydroxyl groups were reproduced.

关键词： silica restored tetrachloride isotherms hydroxyl reproduced destroyed acetic mentioned heated

Investigations on the Degradation of Triazine Herbicides in Water by Photo-Fenton Process

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American Journal of Analytical Chemistry 2014年第8期5卷 500-517页

作者： Sondos Dbira Ahmed Bedoui Nasr Bensalah Department of Chemistry and Earth Sciences College of Arts and Sciences Qatar University Doha Qatar Department of Chemistry Faculty of Sciences of Gabes University of Gabes Gabes Tunisia

In this work, the degradation of 2-chloro-4,6-diamino-1,3,5-triazine in aqueous solutions by photo-Fenton process has been investigated. The preliminary results have shown that the degradation of 2-chloro-4,6-diamino-1,3,5-triazine by photo-Fenton process is more rapid and more effective than Fenton and UV/H2O2 processes. The effects of certain experimental parameters on kinetics and efficiency of the degradation of 2-chloro-4,6,-diamino-1,3,5-triazine by photo-Fenton process, have been evaluated. Under optimal conditions, photo-Fenton process achieved more than 90% of chloride release and about 30% of nitrate formation. The results of total organic carbon (TOC) and total Kjeldahl nitrogen (TKN) analyses have shown that no carbon dioxide and ammonia are formed during photo-Fenton treatment of aqueous solutions containing 40 mg/L triazine. These results indicate that only substituent groups of triazine ring are released;however, nitrogen atoms of triazine ring remain unaffected. A simple mechanism of degradation of 2-chloro-4,6-diamino-1,3,5-triazine has been proposed. The degradation starts by a rapid release of chlorine atoms as chloride ions to form 2-hydroxy-4,6-diamino-1,3,5-triazine. The amino groups of 2-hydroxy-4,6-diamino-1,3,5-triazine undergo are oxidized into nitro groups by hydroxyl radicals to form 2-hydroxy-4,6-dinitro-1,3,5-triazine which undergoes a slow release of nitro groups and their substitution with hydroxyl groups to form cyanuric acid and nitrate ions. The degradation of cyanuric acid by photo-Fenton process has also been investigated. The results of TOC and TKN analyzes show that no carbon dioxide is formed during the treatment.

关键词： Photo-Fenton Process hydroxyl Radicals s-Triazine Herbicides Degradation Cyanuric Acid

Studies on the Internal Ballistics of Composite Solid Rocket Propellants Incorporating Nano-Structured Catalysts

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Advances in Aerospace Science and Technology 2017年第4期2卷 48-72页

作者： Mukesh R. Sivasubramaniyam R. Elangovan R. R. Abhinaya Sree R. Harish R. Rajashree D. Satish Kumar Kanhar Department of Aeronautical Engineering A.C.S College of Engineering Bangalore India Department of Mechanical Engineering A.C.S College of Engineering Bangalore India

This paper deals with the analysis of burn rate using various catalysts of Iron Oxide and determining which gives the higher burn rate with low pressure variation. The Ammonium Perchlorate (AP) was obtained and ground into fine powder with the particle size ranging from 63 to 125 μm. The propellant strands were prepared with proportions by mixing AP with the binder (hydroxyl Terminated Polybutadiene), the catalyst (Iron Oxide), curing agent (Isophorone diisocyanate) and the plasticizer (Dioctyladipate). The prepared propellant mixture was cured at around 63 deg C to get various propellant strands. The first strand was prepared with the absence of a catalyst to set an initial base of comparison with other Iron Oxide catalysts, namely, Flower Shaped, Micro and Nano, based on the size of the particles. The combustion process was carried out in a strand burner, which was in turn connected to a data acquisition system. The obtained output was analysed in the form of graphs. The burn rate was achieved by calculating the slope of the graph i.e . by calculating the difference between the highest and the lowest peak of the graph and dividing the total time by the answer. The experiment was repeated with the different catalyst types, as mentioned above, at different pressures. It was observed that the Nano shaped Iron Oxide exhibits better burning characteristics when compared to the rest with the pressure index of 0.792. In this paper, the various experiments carried out along with their procedures are explained in detail. The results obtained and the techniques used are also elaborately described in this paper.

关键词： Ammonium Perchlorate Dioctyladipate hydroxyl Terminated

Removal of 17β-Estradiol by Electro-Fenton Process

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Materials Sciences and Applications 2012年第12期3卷 880-886页

作者： I. Naimi N. Bellakhal Department of Chemistry and Biology National Institute of Applied Sciences and Technology Tunis Tunisia

The Electrochemical advanced oxidation method “Electro-Fenton” has been applied to remove 17β-estradiol (17β)- estra-1,3,5(10)-triéne-3,17-diol) in aqueous-acetonitrile mixture. This endocrine disrupting is a steroid hormone, releases from humans, animals and residual pharmaceuticals into the environmental water and usually causes suspected undesirable effects in aquatic organisms. The degradation of this organic compound by Electro-Fenton process was showed using a carbon felt cathode and platinum anode. The evolution of the concentration during treatment was followed up by high performance liquid chromatography (HPLC). The influence of operating conditions on the degradation of 17β-estradiol by Electro-Fenton step, such as initial concentration and catalyst concentration, has been investi- gated and discussed. We showed that the degradation reaction obeyed apparent first-order reaction kinetics, with absolute rate constant determined as 5.12 × 109 M–1 s–1 by competitive kinetics method taking Benzoic Acid as reference compound. The results confirm the efficiency of the Electro-Fenton process to degrade organic pollutant in aqueous-acetonitrile mixture.

关键词： 17β-Estradiol Endocrine Disrupting Chemicals Electro-Fenton hydroxyl Radicals Degradation