scholarly journals Method of Utilization of the Spent Vanadium Catalyst

2018 ◽  
Vol 20 (3) ◽  
pp. 1-7
Author(s):  
Krzysztof Mazurek ◽  
Piotr Grzesiak ◽  
Sebastian Drużyński ◽  
Urszula Kiełkowska ◽  
Adriana Wróbel ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Potassium Hydroxide ◽  
Potassium Hydroxide Solution ◽  
Catalyst Particle ◽  
Vanadium Catalyst ◽  
Exchange Method ◽  
Hydroxide Solution ◽  
Solid Ratio ◽  
Effi Ciency ◽  
Complex Utilization

Abstract A spent vanadium catalyst, from the plant of metallurgical type, was leached in a potassium hydroxide solution to recover vanadium. The effect of time, temperature, concentration of basic, catalyst particle size and phase ratio was studied. The results showed that for a 160-750 μm catalyst leached for 4 h at 313.15 K in the presence of 10% potassium hydroxide solution at a liquid: solid ratio of 20:1, the extent of leaching of V was about 87%. Additionally, separation of vanadium from such a solution was investigated by the ion exchange method. Two types of polymer strongly basic ion exchangers were used. The ion exchange tests indicate that vanadium were loaded from the post-leaching solution with high effi ciency. On this basis a fl owsheet for the proposed process of a complex utilization of the spent vanadium catalyst is presented.

scholarly journals Extraction of vanadium compounds from the used vanadium catalyst with the potassium hydroxide solution

2010 ◽  
Vol 12 (1) ◽  
pp. 23-28 ◽  
Author(s):  
Krzysztof Mazurek ◽  
Katarzyna Białowicz ◽  
Mieczysław Trypuć
Keyword(s):  
Liquid Phase ◽  
Potassium Hydroxide ◽  
Potassium Hydroxide Solution ◽  
Total Iron ◽  
Iron Ions ◽  
Vanadium Catalyst ◽  
Vanadium Compounds ◽  
Optimal Ratio ◽  
Hydroxide Solution ◽  
Grain Diameter

Extraction of vanadium compounds from the used vanadium catalyst with the potassium hydroxide solution The paper presents the results of the research on the degree of the recovery of vanadium(V) from the used vanadium catalyst with the use of KOH solution. The extraction was performed at 293 - 323 K, for 0.5 to 4 h and the catalysts of the variable grain diameter. The concentration of the extracting solution was varied in the range 5 - 20%. The optimal ratio of solid to liquid phase S/L was determined. Additionally the degree of the recovery of total iron ions was presented.

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.

New response to sexual characteristics

2021 ◽  
Vol 20 (9) ◽  
pp. 987-987
Author(s):  
V. G.
Keyword(s):  
Potassium Hydroxide ◽  
Sodium Hydroxide Solution ◽  
Potassium Hydroxide Solution ◽  
Test Tube ◽  
Animal Tissues ◽  
Hydroxide Solution ◽  
Sexual Characteristics ◽  
Small Test ◽  
Small Test Tube ◽  
Color Indicator

Prof. Bernatsky (Doctor. Gaz., 1924, No. 18) describes a new specific reaction to the sexual characteristics of plant and animal tissues. 1/4 of the timing is taken. test tissue, crushed in a mortar, placed in a small test tube ("port-fleur"), 1 cube of site is poured, a mixture of equal parts of 0.582% sodium hydroxide solution and 0.816% potassium hydroxide solution, the mixture is thoroughly mixed with a glass rod, and 1 a drop of a color indicator consisting of 2 hours of alcohol (95-96 ) 1% dalpy solution, 1 hour. one

Occurrence of Yersinia enterocolitica in Poultry Products

1982 ◽  
Vol 45 (4) ◽  
pp. 322-325 ◽  
Author(s):  
E. DE BOER ◽  
B. J. HARTOG ◽  
J. OOSTEROM
Keyword(s):  
Yersinia Enterocolitica ◽  
Bile Salts ◽  
Potassium Hydroxide ◽  
Saline Solution ◽  
Potassium Hydroxide Solution ◽  
Macconkey Agar ◽  
Hydroxide Solution ◽  
Poultry Products ◽  
Phosphate Buffered Saline

In a study on isolation of Yersinia enterocolitica from poultry products, usefulness of the following enrichment media was evaluated: phosphate-buffered saline solution with and without addition of 1% sorbitol plus 0.15% bile salts, modified Rappaport medium and selenite broth. Plating was performed on MacConkey agar directly from the incubated broths and after treatment of the enrichment broths with a potassium hydroxide solution. Seventy-three of 108 (68%) samples of poultry products contained Y. enterocolitica. Y. enterocolitica was isolated most frequently after enrichment in phosphate-buffered saline solution with sorbitol and bile salts. Nearly all Y. enterocolitica strains were found after KOH-treatment. Serotyping showed that the isolated strains mainly belonged to the category of the non-pathogenic, so called “environmental” strains.

Fabrication of porous ZnO via electrochemical etching using 10wt% potassium hydroxide solution

2013 ◽  
Vol 16 (1) ◽  
pp. 70-76 ◽  
Author(s):  
C.G. Ching ◽  
P.K. Ooi ◽  
S.S. Ng ◽  
M.A. Ahmad ◽  
Z. Hassan ◽  
...  
Keyword(s):  
Potassium Hydroxide ◽  
Electrochemical Etching ◽  
Potassium Hydroxide Solution ◽  
Hydroxide Solution
Sign in / Sign up

Export Citation Format

Share Document