scholarly journals THE VELOCITY OF THE REACTION BETWEEN FERROUS CHLORIDE, POTASSIUM CHLORATE AND HYDROCHLORIC ACID.

1897 ◽  
Vol 19 (3) ◽  
pp. 199-213 ◽  
Author(s):  
A. A. Noyes ◽  
R. S. Wason
Keyword(s):  
Hydrochloric Acid ◽  
Potassium Chlorate ◽  
Ferrous Chloride

scholarly journals Recovery of Tantalum and Manganese from Epoxy-Coated Solid Electrolyte Tantalum Capacitors through Selective Leaching and Chlorination Processes

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 656
Author(s):  
Wei-Sheng Chen ◽  
Chih-Yuan Hsiao ◽  
Cheng-Han Lee
Keyword(s):  
Reaction Time ◽  
Hydrochloric Acid ◽  
Solid Electrolyte ◽  
Epoxy Resin ◽  
Selective Leaching ◽  
Ferrous Chloride ◽  
Electronic Products ◽  
Solid Ratio ◽  
Chlorination Process ◽  
Acid Type

Electronic products are ever growing in popularity, and tantalum capacitors are heavily used in small electronic products. Spent epoxy-coated solid electrolyte tantalum capacitors, containing about 22 wt.% of tantalum and 8 wt.% of manganese, were treated with selective leaching by hydrochloric acid and chlorination after removing the epoxy resin, and the products converted, respectively, to Mn(OH)2 and TaCl5. The effects of acid type, acid concentration, liquid–solid ratio, and reaction time were investigated to dissolve the manganese. The optimal selective leaching conditions were determined as 3 mol/L of HCl, 40 mL/g at 25 °C for 32 min. Next, residues of selective leaching after washing and drying were heated with ferrous chloride to convert to pure TaCl5. Mixing 48 wt.% of chloride and 52 wt.% of residues for a total of 5 g was conducted to complete the chlorination process in the tube furnace at 450 °C for 3 h. A total of 2.35 g of Ta was collected and the recovery of Ta achieved 94%. Finally, Mn(OH)2 and TaCl5 were separated and purified as the products.

scholarly journals I. Contributions to the history of orcin.—No. II. Chlorine- and bromine-substitution compounds of the orcins

1872 ◽  
Vol 20 (130-138) ◽  
pp. 72-80
Keyword(s):  
Melting Point ◽  
Hydrochloric Acid ◽  
Potassium Chlorate ◽  
The Other ◽  
Crystalline Substance ◽  
History Of ◽  
Bromine Substitution

Schunck, and subsequently the author of this paper*, many years ago studied the action of chlorine upon orcin, and obtained more or less crystalline products, contaminated with a brown resinous matter, from which however, they did not succeed in separating the crystals in a state of purity. In the year 1864 De Luynes § obtained a crystalline substance by acting on orcin with a mixture of potassium chlorate and hydrochloric acid. De Luynes states it to be trichlororcine, C 7 H 5 Cl 3 O 2 , and in Kekule’s 'Benzolderivate' the melting-point is given at 159°. Pentachlororcin ,C 7 H 3 Cl 5 O 2 . -This compound was obtained by the action of chlorine upon orcin when the former was kept in excess. Two methods of effecting this object were employed,— the first by adding the orcin to chlorine hydrate, the other by the action of potassium chlorate and hydrochloric acid.

XVI.—On a Modification of Pelouze's Method for determining Nitrates

1915 ◽  
Vol 35 ◽  
pp. 168-169
Author(s):  
E. A. Letts ◽  
Florence W. Rea
Keyword(s):  
Hydrochloric Acid ◽  
Potassium Permanganate ◽  
Chloride Solution ◽  
Ferrous Chloride ◽  
Sodium Salts ◽  
Iron Wire ◽  
Ferrous Salt ◽  
Diluted Solution ◽  
Ferrous Chloride Solution

Pelouze, as early as 1847, employed a method for determining nitrates in the commercial potassium and sodium salts, in which weighed quantities of the latter were boiled with ferrous chloride solution (obtained by treating a definite weight of iron wire with excess of hydrochloric acid), and afterwards the remainder of the ferrous salt was determined by titration of the diluted solution with potassium permanganate.

THE SYNTHESIS OF SOME DERIVATIVES OF 3,4-METHYLENEDIOXYBENZENE

1964 ◽  
Vol 42 (8) ◽  
pp. 1901-1905 ◽  
Author(s):  
Pritam Singh ◽  
Louis Berlinguet
Keyword(s):  
Aqueous Solution ◽  
Hydrochloric Acid ◽  
Acetic Anhydride ◽  
Hydrazine Hydrate ◽  
Propionic Acid ◽  
Sodium Acetate ◽  
Potassium Chlorate ◽  
Ammonium Formate ◽  
Dilute Aqueous Solution ◽  
Derivatives Of

A few derivatives of 3,4-methylenedioxy-α-nitromethylbenzyl alcohol (I) have been prepared. Chlorination with hydrochloric acid and potassium chlorate gave 6-chloro-3,4-methylenedioxy-α-nitromethylbenzyl alcohol (II) which on refluxing with acetic anhydride and sodium acetate gave 6-chloro-3,4-methylenedioxy-ω-nitrostyrene (III). Attempted reduction of (I) with ammonium formate resulted in dehydration to give 3,4-methylenedioxy-ω-nitrostyrene (IV). Reduction of (I) with hydrazine hydrate gave an isobenzaldoxime (VI).β-(3,4-Methylenedioxyphenyl) serine (VII) was prepared by the condensation of piperonal with glycine. α,β-Dibromo-β-(3,4-methylenedioxyphenyl) propionic acid could not be aminated by a dilute aqueous solution of ethylamine. Decarboxylation and elimination of HBr took place to give ω-bromo-3,4-methylenedioxystyrene (VIII).

Dissolution of oxidised Co–Cu ores using hydrochloric acid in the presence of ferrous chloride

2011 ◽  
Vol 108 (3-4) ◽  
pp. 233-236 ◽  
Author(s):  
M. Clotilde Apua ◽  
A.F. Mulaba-Bafubiandi
Keyword(s):  
Hydrochloric Acid ◽  
Ferrous Chloride
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