Propylene-Sulfuric Acid Reaction

1972 ◽  
Vol 11 (2) ◽  
pp. 187-191 ◽  
Author(s):  
A. H. Pelofsky
Keyword(s):  
Sulfuric Acid ◽  
Acid Reaction

Kinetics of the Cholesterol-Sulfuric Acid Reaction: A Fast Kinetic Method for Serum Cholesterol

1973 ◽  
Vol 19 (10) ◽  
pp. 1128-1134 ◽  
Author(s):  
Thomas E Hewitt ◽  
Harry L Pardue
Keyword(s):  
Sulfuric Acid ◽  
Serum Cholesterol ◽  
Kinetic Method ◽  
Cholesterol Concentration ◽  
Optimal Conditions ◽  
Experimental Conditions ◽  
Kinetic Determination ◽  
Acid Reaction ◽  
Fast Kinetic ◽  
Kinetics Of

Abstract We studied the kinetics of the reaction between cholesterol and sulfuric acid in acetic acid-acetic anhydride medium. Results have been used to establish near-optimal conditions for the fast kinetic determination of cholesterol in serum. The reaction rate measured during the first 20 s of the reaction is proportional to cholesterol concentration. There is good agreement (<2% deviation) between pseudo-first-order rate constants for cholesterol standards and sera. Recoveries of standard cholesterol added to sera range from 99% to 104% (average, 100.7%). Values for serum cholesterol by this kinetic determination tend to be somewhat lower than equilibrium values reported by local hospital laboratories. Whether bilirubin interferes depends on reaction conditions; under optimal conditions, each milligram of bilirubin is kinetically equivalent to about 1 mg of apparent cholesterol. Kinetic data are included to show how results are degraded by operating under nonoptimal conditions, and considerations involved in changing experimental conditions are discussed.

Study on Preparation of Calcium Sulfate Whisker with Leaching Tailings of Nickel Ore

2011 ◽  
Vol 287-290 ◽  
pp. 2084-2087 ◽  
Author(s):  
Li Wang ◽  
Chun Yan Zhuang ◽  
De Qin Meng
Keyword(s):  
Sulfuric Acid ◽  
Calcium Sulfate ◽  
Preparation Method ◽  
Orthogonal Experiment ◽  
Raw Material ◽  
High Grade ◽  
Reaction Conditions ◽  
Acid Reaction ◽  
Calcium Sulfate Whiskers ◽  
Calcium Sulfate Whisker

Taking leaching tailings of the nickel ore as raw material, calcium sulfate whiskers were prepared. The effects of Mg/Ca mole ratio, concentration of sulfuric acid, reaction temperature and precipitating time on the recovery of calcium were studied in this paper. The preparation method and reaction conditions of fibrous calcium sulfate whisker have been optimized by an orthogonal experiment, in order to obtain a high grade whisker product which could meet industrial requirements on whiteness and size.

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