KINETICS OF THE REACTION OF SULFIMIDES WITH POTASSIUM HYDROXIDE IN METHANOL

1979 ◽  
Vol 6 (3) ◽  
pp. 429-434 ◽  
Author(s):  
Toshiaki Masuda ◽  
Tetsuo Aida ◽  
Naomichi Furukawa ◽  
Shigeru Oae
Keyword(s):  
Potassium Hydroxide ◽  
Kinetics Of

Kinetics and mechanism of cyclization of N-(2-methoxycarbonylphenyl)-N’-methylsulphonamide to 3-methyl-(1H)-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxide

1991 ◽  
Vol 56 (8) ◽  
pp. 1701-1710 ◽  
Author(s):  
Jaromír Kaválek ◽  
Vladimír Macháček ◽  
Miloš Sedlák ◽  
Vojeslav Štěrba
Keyword(s):  
Potassium Hydroxide ◽  
Acid Catalysis ◽  
Potassium Hydroxide Solution ◽  
Hydroxide Solution ◽  
General Base ◽  
Rate Limiting Step ◽  
Limiting Step ◽  
Cyclization Kinetics ◽  
Rate Limiting ◽  
Kinetics Of

The cyclization kinetics of N-(2-methylcarbonylphenyl)-N’-methylsulfonamide (IIb) into 3-methyl-(1H)-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxide (Ib) has been studied in ethanolamine, morpholine, and butylamine buffers and in potassium hydroxide solution. The cyclization is subject to general base and general acid catalysis. The value of the Bronsted coefficient β is about 0.1, which indicates that splitting off of the proton from negatively charged tetrahedral intermediate represents the rate-limiting and thermodynamically favourable step. In the solutions of potassium hydroxide the cyclization of dianion of the starting ester IIb probably becomes the rate-limiting step.

scholarly journals Low-Cost Temperature Transition Mixtures (TTM) Based on Ethylene Glycol/potassium Hydroxide as Reversible CO2 Sorbents

2021 ◽  
Author(s):  
Marcello Costamagna ◽  
Eleonora Micheli ◽  
Valentino Canale ◽  
Michele Ciulla ◽  
Gabriella Siani ◽  
...  
Keyword(s):  
High Pressure ◽  
Ethylene Glycol ◽  
Potassium Hydroxide ◽  
Low Cost ◽  
Effect Of Temperature ◽  
Temperature Transition ◽  
Component Mixture ◽  
Multiple Absorption ◽  
Optimized Conditions ◽  
Kinetics Of

A low-cost Transition Temperature Mixture (TTM) has been synthesized by mixing ethylene glycol and potassium hydroxide as a new non-aqueous CO<sub>2</sub> sorbent. Boric acid has been added to ensure the reversibility of the system and a small amount of water to modulate the viscosity and optimize the performances. The resulting mixtures have been characterized in terms of viscosity, conductivity and density over temperature (therefore ionicity <i>via</i> Walden plots) and the effect of temperature, pressure and the kinetics of the absorption have been evaluated. Under optimized conditions, the four-component mixture EG/KOH/BA/H<sub>2</sub>O 3:1:1:3 can absorb 24 g<sub>CO2</sub>/kg<sub>sorbent</sub> in 30 minutes at 35°C at 1 atm (59 after 4 h) and 60 g<sub>CO2</sub>/kg<sub>sorbent</sub> in 30 minutes at high pressure (10 and 20 atm, 80 g<sub>CO2</sub>/kg<sub>sorbent</sub> after 50 min), while the desorption is quantitative after 30 minutes at only 60°C under a gentle N<sub>2</sub> flow. The system is robust enough to ensure multiple absorption/desorption cycles.

Kinetics of Catalytic Dehydration of 1-Pentanol

1993 ◽  
Vol 58 (8) ◽  
pp. 1874-1884 ◽  
Author(s):  
Iveta Vašutová ◽  
Milan Králik ◽  
Milan Hronec
Keyword(s):  
Experimental Data ◽  
Kinetic Data ◽  
Potassium Hydroxide ◽  
Molar Fraction ◽  
Space Velocity ◽  
Continuous Reactor ◽  
Alumina Catalyst ◽  
Direct Formation ◽  
Kinetics Of ◽  
Hydrolysis Of

Kinetic data of 1-pentanol dehydration on γ-alumina catalyst modified by potassium hydroxide were obtained using a continuous reactor with an internal recirculation. The conversion of 1-pentanol on this catalyst in the temperature range 300 - 390 °C and space velocity 1 - 8 kg (h kg)-1 (molar fraction of water in the feed was in the range 0 - 0.56) was 50 - 98% and the selectivity with respect to 1-pentene was 50 - 84%. The following six reactions have been taken into account to describe the catalytic dehydration of 1-pantanol: direct formation of 1-pentene from 1-pentanol, formation of bis(1-pentyl) ether from 1-pentanol, disproportionation of the ether to 1-pentanol and 1-pentene, formation of 1-pentene from the ether, isomerization of 1-pentene to 2-pentene and hydrolysis of the ether to 1-pentanol. Treatment of experimental data by Langmuir-Hinshelwood models showed that the model involving adsorption of 1-pentanol accompanied by dissociation is the most suitable one.

scholarly journals Study on the Corrosion Kinetics of Iron in Acid and Base Medium

2011 ◽  
Vol 8 (s1) ◽  
pp. S358-S362 ◽  
Author(s):  
D. B. Patil ◽  
A. R. Sharma
Keyword(s):  
Weight Loss ◽  
Nitric Acid ◽  
Sulphuric Acid ◽  
Potassium Hydroxide ◽  
Corrosion Kinetics ◽  
Acid And Base ◽  
Weight Loss Method ◽  
Loss Method ◽  
Corrosion Of Iron ◽  
Kinetics Of

The kinetics of corrosion of iron in acid and base medium by weight loss method was investigated. The corrosion kinetics was studied in sulphuric acid, nitric acid and potassium hydroxide by weight loss method at different time intervals at 25.0°C to 40.0°C. The result showed that the corrosion rate vary with different time interval and different acid – base concentration. The order of corrosion of iron in these media was found to be nitric acid > sulphuric acid > potassium hydroxide. Further the specific reaction rate, half-life time, energy of activation, entropy of activation and enthalpy of activation was also evaluated.

Kinetics of nonylphenol polyethoxylation catalyzed by potassium hydroxide

1990 ◽  
Vol 29 (5) ◽  
pp. 719-725 ◽  
Author(s):  
E. Santacesaria ◽  
M. Di Serio ◽  
L. Lisi ◽  
D. Gelosa
Keyword(s):  
Potassium Hydroxide ◽  
Kinetics Of

Kinetic Investigations of Biodiesel from Cottonseed Oil and Ethanol by Transesterification in Biomaterial and its Application

2012 ◽  
Vol 578 ◽  
pp. 73-77 ◽  
Author(s):  
Jin Si Chen ◽  
Xian Guo Hu ◽  
Xiang Yang Wang ◽  
Yu Fu Xu ◽  
En Zhu Hu
Keyword(s):  
Potassium Hydroxide ◽  
Reaction Rate ◽  
Cottonseed Oil ◽  
Order Reaction ◽  
Order Model ◽  
Reaction Rate Constants ◽  
Pseudo Second Order ◽  
Zero Order Reaction ◽  
Kinetic Investigations ◽  
Kinetics Of

The kinetics of transesterification for biodiesel produced by cottonseed oil and ethanol in catalyst (potassium hydroxide) was investigated. The reaction of transesterification can be described by pseudo second order model for the initial stages of the reaction, followed by zero order reaction. The reaction rate constants for transestentcation of cottonseed oil with ethanol at 40°C, 60°C and 78°C are 0.0996, 0.1126and0.1286 L•mol-1/min-1 respectively, and the activation energy of transesterification is 21.6075kJ/mol．

Sign in / Sign up

Export Citation Format

Share Document