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Sigma-Aldrich

Potassium bisulfate

reagent grade

Synonym(s):

Potassium hydrogen sulfate

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About This Item

Linear Formula:
KHSO4
CAS Number:
7646-93-7
Molecular Weight:
136.17
EC Number:
231-594-1
MDL number:
MFCD00011404
UNSPSC Code:
12352302
eCl@ss:
38030413
PubChem Substance ID:
329752310
NACRES:
NA.21

grade

reagent grade

Quality Level

200

form

powder or crystals

concentration

35.0-37.0% H2SO4 (titration)

mp

214 °C (lit.)

acid number

35‑37%(as H2SO4)

density

2.32 g/mL at 25 °C (lit.)

SMILES string

[K+].OS([O-])(=O)=O

InChI

1S/K.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+1;/p-1

InChI key

CHKVPAROMQMJNQ-UHFFFAOYSA-M

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General description

Potassium bisulfate is a water soluble inorganic salt mainly used as a preservative, as a flux and also in the manufacture of fertilizers.
Potassium bisulfate is an inorganic potassium salt. On heating it from 300 to 700°C, it transforms to molten form and the reactions occurring in this transition have been investigated by Raman spectra. Its electrical conductance values have been evaluated (T = 0-700C, Pressure = upto 4000bars).

Application

Potassium bisulfate (Potassium hydrogen sulfate) may be employed as a catalyst in the synthesis of butyl paraben and methyl cinnamate. It may also be used for the gravimetric estimation of beryllium in beryl.
Potassium bisulfate may be used:
  • As a catalyst for the preparation of butyl paraben from p-hydroxybenzoic acid and n-butyl alcohol.
  • As a promoter for the synthesis of 3,4-dihydropyrimidin-2(1H)-one derivatives via Biginelli reaction in ethylene glycol.
  • As an acid catalyst for the synthesis of ethyl tert-butyl ether (ETBE) from ethanol and tert-butyl alcohol via reactive distillation.
  • As a dehydrating agent for the synthesis of pyruvic acid from tartaric acid.

Pictograms

CorrosionExclamation mark
GHS05,GHS07

Signal Word

Danger

Hazard Statements

H314,H335

Hazard Classifications

Eye Dam. 1 - Skin Corr. 1B - STOT SE 3

Target Organs

Respiratory system

Storage Class Code

8A - Combustible corrosive hazardous materials

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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Reactive distillation for synthesizing ethyl tert-butyl ether from low-grade alcohol catalyzed by potassium hydrogen sulfate.
Matouq M, et al.
Industrial & Engineering Chemistry Research, 35(3), 982-984 (1996)
Craig BD and Anderson DS
Handbook of Corrosion Data, 634-634 null
Raman spectral studies of molten potassium bisulfate and vibrational frequencies of S2O7 groups.
Walrafen GE, et al.
J. Chem. Phys. , 37(3), 662-670 (1962)
Synthesis of Methyl Cinnamate using Potassium Bisulfate as Catalyst [J].
4Danmei LSL.
Guangzhou Chemical Industry/ Guangzhou Huagong, 2, 005-005 (2003)
Synthesis of Butyl Paraben Catalyzed by Potassium Bisulfate [J].
Jianying CDZHH.
Food and Fermentation Industries, 11, 022-022 (2006)
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