7646-93-7 Usage
Description
Potassium bisulfate, also known as potassium hydrogen sulfate or acid potassium sulfate, is a colorless crystalline solid with a sulfur odor. It is water-soluble and has a melting point of 214°C. Potassium bisulfate is used in various industries, including wine making, fertilizer manufacturing, and as a flux and food preservative. It may cause illness from ingestion and emit toxic fumes when heated to high temperatures.
Uses
Used in Wine Making:
Potassium bisulfate is used as a disintegrating agent in the conversion of tartrates to bitartrates in wine, improving the quality and stability of the final product.
Used in Fertilizer Manufacturing:
Potassium bisulfate is used as a catalyst in the preparation of butyl paraben from p-hydroxybenzoic acid and n-butyl alcohol, as well as in the synthesis of 3,4-dihydropyrimidin-2(1H)-one derivatives via the Biginelli reaction in ethylene glycol. It is also employed as an acid catalyst for the synthesis of ethyl tert-butyl ether (ETBE) from ethanol and tert-butyl alcohol via reactive distillation.
Used in Chemical Analysis:
Potassium bisulfate is used as a flux in the analysis of ores and siliceous compounds, aiding in the identification and quantification of these materials.
Used in Food Preservation:
Potassium bisulfate serves as a dehydrating agent in the synthesis of pyruvic acid from tartaric acid, which can be used as a preservative in the food industry.
Used in Electrolysis:
Potassium bisulfate is used as an intermediate in the preparation of potassium persulfate by electrolysis, a process that produces a compound with various industrial applications.
Air & Water Reactions
Fused salt is deliquescent, Soluble in water, yielding a corrosive acidic solution.
Reactivity Profile
Acidic salts, such as Potassium bisulfate , are generally soluble in water. The resulting solutions contain moderate concentrations of hydrogen ions and have pH's of less than 7.0. They react as acids to neutralize bases. These neutralizations generate heat, but less or far less than is generated by neutralization of inorganic acids, inorganic oxoacids, and carboxylic acid. They usually do not react as either oxidizing agents or reducing agents but such behavior is not impossible. Many of these compounds catalyze organic reactions.
Health Hazard
TOXIC; inhalation, ingestion or skin contact with material may cause severe injury or death. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.
Fire Hazard
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated.
Safety Profile
Moderately toxic by
ingestion. A corrosive irritant to the skin,
eyes, and mucous membranes. When heated
to decomposition it emits toxic fumes of SOx and K2O. Can form an explosive
mixture. See also SULFATES.
Purification Methods
Crystallise it from H2O (1mL/g) between 100o and 0o. It is also formed when a warm solution of K2SO4 in conc H2SO4 is cooled down.
Check Digit Verification of cas no
The CAS Registry Mumber 7646-93-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,6,4 and 6 respectively; the second part has 2 digits, 9 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 7646-93:
(6*7)+(5*6)+(4*4)+(3*6)+(2*9)+(1*3)=127
127 % 10 = 7
So 7646-93-7 is a valid CAS Registry Number.
InChI:InChI=1/K.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+1;/p-1
7646-93-7Relevant articles and documents
1H and 39K nuclear magnetic resonance relaxation study in a KHSO4 single crystal
Lim, Ae Ran,Shin, Hee Won,Jeong, Dong Young
, p. 1308 - 1309 (2003)
-
Crist, R. H.
, p. 3939 (1932)
Kailan, A.,Olbrich, L.
, (1926)
Comparative thermoanalytical investigation of the cross-linking behaviour of three different paraffin waxes in the presence of potassium persulphate
Luyt,Ishripersadh,Timm
, p. 55 - 67 (1999)
The cross-linking of three different paraffin waxes - a hard oxidised wax, a medium wax, and a hard wax with narrow molar mass distribution - in the presence of potassium persulphate (PPS) was investigated thermoanalytically. DSC and TG curves for untreated waxes and waxes treated with different amounts of PPS were obtained and the observations were compared with gel content data obtained through gravimetric analysis. Although initial indications were that cross-linking did occur, reheat curves of wax/PPS mixtures as well as gel content data showed that no cross-linking occurred. It was, however, found that PPS most probably decomposed into KHSO4 and that this decomposition gave rise to functionalisation of the waxes.
Friend, J. A. N.
, p. 1092 - 1102 (1906)
Synthesis, crystal structure, and vibrational spectra of M 4V2O3(SO4)4 (M = K, Rb, Cs)
Krasil'Nikov,Tyutyunnik,Zubkov,Berger,Perelyaeva, L. Ya.,Baklanova
, p. 491 - 500 (2011/08/08)
Synthesis was performed and physicochemical properties were studied for the M4V2O3(SO4)4 complexes, where M = K, Rb, or Cs. Their crystal structures were determined using the set of data from X-ray diffraction and neutron diffraction studies. All compounds crystallize in a triclinic lattice (space group P1, Z = 2) with the parameters: a = 7.7688(2), 7.8487(1), 8.1234(1) ?; b = 10.4918(3), 10.8750(2), 11.1065(1) ?; c = 11.9783(4), 12.1336(2), and 11.8039(1) ?; α = 76.600(2)°, 77.910(1)°, 79.589(1)°; β = 75.133(2)°, 75.718(1)°, 87.939(1)°; γ = 71.285(2)°, 72.189(1)°, 75.567(1)°; V = 881.78(5), 945.42(3), 1014.34(2) ?3 for K, Rb, Cs, respectively. The structure of M4V2O 3(SO4)4 was found to be formed by discrete complex anions V2O3(SO4) 4 4- incorporating two oxygen-bridged vanadium atoms in a distorted octahedral oxygen environment. The sulfate groups are coordinated by the vanadium atoms in the chelating mode with a large scatter of S-O interatomic distances and OSO angles. Every VO6 octahedron has a short terminal vanadium-oxygen bond with a length of about 1.6?. The V2O 3(SO4) 4 4- complex anions in potassium and rubidium compounds differ from that in Cs4V 2O3(SO4)4 in the type of symmetry and mutual spatial orientation. The vibrational spectra were presented and interpreted in line with the structural analysis data.
Reaction of graphite with sulfuric acid in the presence of KMnO4
Sorokina,Khaskov,Avdeev,Nikol'skaya
, p. 162 - 168 (2007/10/03)
The reaction of graphite with sulfuric acid in the presence of KMnO 4 (oxidant : graphite ratio 0.027-0.55) involves consecutive and concurrent reactions: graphite intercalation and direct oxidation of the carbon matrix. The properties of graph
