Effect of temperature upon the dissolution of molybdenum-coated steels in sulfuric acid

1975 ◽  
Vol 14 (3) ◽  
pp. 223-225 ◽  
Author(s):  
V. M. Sharov ◽  
E. I. Kozlov ◽  
D. M. Karpinos ◽  
V. G. Zil'berberg ◽  
N. I. Biryukov
Keyword(s):  
Sulfuric Acid ◽  
Effect Of Temperature

scholarly journals Effect of High Temperature on the Electrochemical and Optical Properties of Emeraldine Salt Doped with DBSA and Sulfuric Acid

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Salma Gul ◽  
Anwar-ul-Haq Ali Shah ◽  
Salma Bilal
Keyword(s):  
Thermal Stability ◽  
Cyclic Voltammetry ◽  
Sulfuric Acid ◽  
Effect Of Temperature ◽  
Visible Spectroscopy ◽  
Emeraldine Salt ◽  
Higher Temperature ◽  
Stability Effect ◽  
Thermal Stability Of ◽  
Comprehensive Study

A comprehensive study of thermally treated polyaniline in its emeraldine salt form is presented here. It offers an understanding of the thermal stability of the polymer. Emeraldine salt was prepared by a novel emulsion polymerization pathway using dodecylbenzene sulfonic acid and sulfuric acid together as dopants. The effect of temperature and heating rate on the degradation of this emeraldine salt was studied via thermogravimetric analysis. The thermally analyzed sample was collected at various temperatures, that is, 250, 490, 500, and 1000°C. The gradual changes in the structure of the emeraldine salt were followed through cyclic voltammetry, Fourier transform infrared spectroscopy, and ultraviolet-visible spectroscopy. Results demonstrate that emeraldine salt shows high thermal stability up to 500°C. This is much higher working temperature for the use of emeraldine salt in higher temperature applications. Further heat treatment seems to induce deprotonation in emeraldine salt. Cyclic voltammetry and ultraviolet-visible spectroscopy revealed that complete deprotonation takes place at 1000°C where it loses its electrical conductivity. It is interesting to note that after the elimination of the dopants, the basic backbone of emeraldine salt was not destroyed. The results reveal that the dopants employed have a stability effect on the skeleton of emeraldine salt.

Effect of temperature and state of hydration on rate of imbibition in soft seeds of yellow serradella

2004 ◽  
Vol 55 (1) ◽  
pp. 39 ◽  
Author(s):  
G. B. Taylor
Keyword(s):  
Sulfuric Acid ◽  
Free Water ◽  
Negligible Effect ◽  
Moisture Loss ◽  
Effect Of Temperature ◽  
Moisture Uptake ◽  
Constant Weight ◽  
Moist Atmosphere ◽  
Ornithopus Compressus ◽  
Hydration And Dehydration

Seeds were removed by hand from pods of yellow serradella (Ornithopus compressus L.) cvv. Santorini and Charano and accession GRC5045-2-2 that were taken from the field on 26 March after burial treatment to initiate seed softening. Times taken for soft seeds to imbibe were determined at constant temperatures of 8�, 20�, and 30�C. Rates of moisture uptake and loss were measured in seeds held in a moist (76% RH) or dry (over sulfuric acid) atmosphere and the effects of hydration and dehydration on subsequent imbibition times determined at 20�C.Temperature had negligible effect on imbibition times in GRC5045-2-2, in which nearly all soft seeds imbibed within 24 h of wetting. Imbibition times in individual seeds of both Charano and Santorini varied from a few days to more than 200 days and were markedly reduced by increasing temperatures. Times taken to approach constant weight in the moist atmosphere were approximately 75, 165, and 430 days in GRC5045-2-2, Charano, and Santorini, respectively. By contrast the rate of moisture loss in the dry atmosphere was similar in all lines. Imbibition times in GRC5045-2-2 were little affected by state of hydration, but in both Santorini and Charano, imbibition was delayed by dehydration and accelerated by hydration.It is proposed that slow imbibition is attributable to the presence of a minute opening in the seed at an as yet unidentified site (possibly the micropyle or hilum) that restricts moisture uptake until a threshold is reached when seeds in contact with water imbibe rapidly. It is hypothesised that the moisture threshold coincides with the build up of sufficient moisture in tissues associated with the underside of the lens, to cause its rupture, thereby allowing rapid uptake of free water.

scholarly journals Effect of Temperature and the Organic Phase Content on the Stripping of Mn(II) from a D2EPHA-KEROSENE Pseudo-Emulsion Using a Sulfuric Acid Aqueous Solution

Engineering ◽  
2012 ◽  
Vol 04 (11) ◽  
pp. 723-727
Author(s):  
Jaime Cristobal Rojas-Montes ◽  
Roberto Pérez-Garibay ◽  
Alejandro Uribe-Salas ◽  
Fabiola Nava-Alonso
Keyword(s):  
Aqueous Solution ◽  
Sulfuric Acid ◽  
Organic Phase ◽  
Effect Of Temperature ◽  
Phase Content ◽  
Acid Aqueous Solution

Hydrolysis of S. platensis Using Sulfuric Acid for Ethanol Production

2022 ◽  
Vol 1048 ◽  
pp. 451-458
Author(s):  
Megawati ◽  
Astrilia Damayanti ◽  
Radenrara Dewi Artanti Putri ◽  
Zuhriyan Ash Shiddieqy Bahlawan ◽  
Astika Arum Dwi Mastuti ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Ethanol Production ◽  
Raw Material ◽  
Effect Of Temperature ◽  
Second Step ◽  
Carbohydrate Composition ◽  
Hydrolysis Time ◽  
Glucose Yield ◽  
Hydrolysis Temperature ◽  
Hydrolysis Of

S. platensis is a microalga that contains carbohydrate composition of 30.21% which makes it potential to be used as raw material for ethanol production. Hydrolysis of S. platensis is the first step for converting its carbohydrates into monosaccharides. The second step is fermentation of monosaccharides into ethanol. This research aims to study the effect of temperature and microalgae concentration on the hydrolysis of S. platensis using sulfuric acid as catalyst. This research was conducted using 300 mL sulfuric acid of 2 mol/L, hydrolysis temperatures of 70, 80 and 90 °C, and microalgae concentrations of 20, 26.7, and 33.3 g/L. The effect of temperature is significant in the hydrolysis of S. platensis using sulfuric acid. At microalgae concentration of 20 g/L and hydrolysis time of 35 minutes, the higher the temperatures (70, 80, and 90 °C), the more the glucose yields would be (8.9, 13.5, and 22.9%). This temperature effect got stronger when the hydrolysis was running for 15 minutes. Every time the hydrolysis temperature increased by 10 °C, the glucose yield increased by 13.0% at microalgae concentration of 33.3 g/L. At temperature of 90 °C and time of 35 minutes, the higher the microalgae concentrations (20, 26.7, and 33.3 g/L), the higher the glucose yields would be (25.5, 27.7, and 28.2%). The highest glucose concentration obtained was 2.82 g/L at microalgae concentration of 33.3 g/L, temperature of 90 °C, and time of 35 minutes.

EFFECT OF TEMPERATURE ON THE ADSORPTION OF METHYLENE BLUE DYE ONTO SULFURIC ACID–TREATED ORANGE PEEL

2014 ◽  
Vol 201 (11) ◽  
pp. 1526-1547 ◽  
Author(s):  
P. Senthil Kumar ◽  
P. Sebastina Anne Fernando ◽  
R. Tanvir Ahmed ◽  
R. Srinath ◽  
M. Priyadharshini ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Sulfuric Acid ◽  
Orange Peel ◽  
Effect Of Temperature ◽  
Blue Dye ◽  
Methylene Blue Dye

Effect of Temperature on Sulfuric Acid Method for Lignin

1932 ◽  
Vol 4 (2) ◽  
pp. 216-217 ◽  
Author(s):  
C. J. Peterson ◽  
A. W. Walde ◽  
R. M. Hixon
Keyword(s):  
Sulfuric Acid ◽  
Effect Of Temperature ◽  
Acid Method ◽  
Sulfuric Acid Method
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