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Potassium benzoate

Potassium benzoate
Potassium benzoate structure
Chemical Name:
Potassium benzoate
Kaliumbenzoat;POTASSIUM BENZOATE;Piatassium benzoate;POTASSIUMBENZOATE,NF;POTASSIUMBENZOATE,FCC;benzoic acid potassium;PotassiumBenzoateC7H5KO2;Kaliumbenzoat,wasserfrei;Potassium Benzoate (1 g);Potassium benzoate Joyce
Molecular Formula:
Formula Weight:
MOL File:

Potassium benzoate Properties

Melting point:
1.558 g/cm3
Soluble in ethanol, slightly soluble in methanol, insoluble in ether.
pH(50g/l, 25℃) : 7.0~9.0
Hydrolytic Sensitivity
0: forms stable aqueous solutions
CAS DataBase Reference
582-25-2(CAS DataBase Reference)
Substances Added to Food (formerly EAFUS)
EWG's Food Scores
EPA Substance Registry System
Benzoic acid, potassium salt (582-25-2)
  • Risk and Safety Statements
Safety Statements  22-24/25
WGK Germany  1
HS Code  2916310002

Potassium benzoate price More Price(5)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 290009 Potassium benzoate ReagentPlus , 99% 582-25-2 1kg $116 2019-12-02 Buy
Sigma-Aldrich 1548101 Potassium benzoate United States Pharmacopeia (USP) Reference Standard 582-25-2 1g $340.55 2019-12-02 Buy
Alfa Aesar A11610 Potassium benzoate, 99% 582-25-2 250g $32.2 2020-06-24 Buy
Alfa Aesar A11610 Potassium benzoate, 99% 582-25-2 1000g $99.4 2020-06-24 Buy
Sigma-Aldrich 290009 Potassium benzoate ReagentPlus , 99% 582-25-2 250g $37.1 2019-12-02 Buy

Potassium benzoate Chemical Properties,Uses,Production


Potassium benzoate is the potassium salt of benzoate. It is mostly used for food preservation for inhibiting the growth of mold, yeast and bacteria since it can create low pH condition after entering into the cells to suppress the anaerobic fermentation of glucose. It can also be used in the whistle in many fireworks. In analytic chemistry, it can be used as eluents for ion chromatography to increase the detector response.

Chemical Properties

Potassium benzoate occurs as a slightly hygroscopic, white, odorless or nearly odorless crystalline powder or granules. Aqueous solutions are slightly alkaline and have a sweetish astringent taste.

Chemical Properties

Potassium benzoate ( E212 ) , the potassium salt of benzoic acid, is a food preservative that inhibits the growth of mold, yeast and some bacteria. It works best in low-pH products, below 4.5, where it exists as benzoic acid.
Acidic foods and beverages such as fruit juice (citric acid), sparkling drinks (carbonic acid), soft drinks (phosphoric acid), and pickles (vinegar) may be preserved with potassium benzoate. It is approved for use in most countries including Canada, the U.S., and the EU, where it is designated by the E number E212. In the EU, it is not recommended for consumption by children.


Pharmaceutic aid (preservative).

Production Methods

Potassium benzoate is prepared from the acid–base reaction between benzoic acid and potassium hydroxide.

Pharmaceutical Applications

Potassium benzoate is predominantly used as an antimicrobial preservative in a wide range of beverages, foods and some pharmaceutical formulations. Preservative efficacy increases with decreasing pH; it is most effective at pH 4.5 or below. However, at low pH undissociated benzoic acid may produce a slight though discernible taste in food products.
Increasingly, potassium benzoate is used as an alternative to sodium benzoate in applications where a low sodium content is desirable.
Therapeutically, potassium benzoate has also been used in the management of hypokalemia.

Safety Profile

Combustible when exposed to heat or flame. When heated to decomposition it emits acrid smoke and irritating fumes.


Potassium benzoate is widely used in food products and is generally regarded as a nontoxic and nonirritant material. However, people with a history of allergies may show allergic reactions when exposed to potassium benzoate. Ingestion is inadvisable for asthmatics. Higher concentrations of potassium benzoate have been reported to cause irritation to mucous membranes.
The WHO acceptable daily intake of total benzoates including potassium benzoate, calculated as benzoic acid, has been estimated at up to 5 mg/kg of body-weight.


Potassium benzoate was recently described by the Food Commission, who campaign for 'safer, healthier food in the UK', as "mildly irritant to the skin, eyes and mucous membranes".
Cats have a significantly lower tolerance to benzoic acid and its salts than rats and mice.

Chemical Synthesis

One very common way to make potassium benzoate is by oxidizing toluene.
Another way to synthesize potassium benzoate in the lab setting is by reacting methyl benzoate with potassium thio acetate.


Potassium benzoate is stable at room temperature under normal storage conditions. Since it is slightly hygroscopic, potassium benzoate should be stored in sealed containers. Exposure to conditions of high humidity and elevated temperatures should be avoided.

Purification Methods

Potassium benzoate [582-25-2] M 160.2. Crystallise it from water (1mL/g) between 100o and 0o. [Beilstein 9 III 375, 9 IV 279.]

Mechanism of food preservation

The mechanism of food preservation begins with the absorption of benzoic acid into the cell. If the intracellular pH changes to 5 or lower, the anaerobic fermentation of glucose through phosphofructokinase is decreased by 95 %.


Carbon 13 NMR
The carbon NMR shows 5 unique peaks. There are four peaks between 130 - 140 ppm from the carbons in the benzene ring. There is an additional carbon peak around 178 ppm representing the carbon from the carbonyl.
Infrared spectrum The following are the main peaks in the IR spectrum.
1610: C=O from carbonyl
1580: C=C from benzene ring.


Potassium benzoate is incompatible with strong acids and strong oxidizing agents.

Regulatory Status

GRAS listed. Accepted as a food additive in Europe. Included in the Canadian List of Acceptable Non-medicinal Ingredients.


Gjerde, Douglas T., and J. S. Fritz. "Sodium and potassium benzoate and benzoic acid as eluents for ion chromatography." Analytical Chemistry 53.14(1981):2324-2327.
Zengin, N., et al. "The evaluation of the genotoxicity of two food preservatives: Sodium benzoate and potassium benzoate." Food & Chemical Toxicology An International Journal Published for the British Industrial Biological Research Association 49.4(2011):763-9.
Zeb, Alam, et al. "Grape juice preservation with benzoate and sorbate. " Advances in Food Sciences (2009).
Marietta, Michael S. "Fireworks artillery shell." US, US6912958. 2005.

Potassium benzoate Preparation Products And Raw materials

Raw materials

Preparation Products

Potassium benzoate Suppliers

Global( 199)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Henan DaKen Chemical CO.,LTD.
+86-371-55531817 CHINA 21838 58
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 22625 55
Hefei TNJ Chemical Industry Co.,Ltd.
86-0551-65418684 18949823763
86-0551-65418684 China 2680 55
career henan chemical co
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Chemwill Asia Co.,Ltd.
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Hubei Jusheng Technology Co.,Ltd.
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Haihang Industry Co.,Ltd
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Hebei Guanlang Biotechnology Co., Ltd.
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Hubei xin bonus chemical co. LTD
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Shandong chuangyingchemical Co., Ltd.
18853181302 CHINA 5917 58

View Lastest Price from Potassium benzoate manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2020-06-02 Potassium benzoate Joyce
US $50.00 / KG 1KG 99% 20tons Hebei Guanlang Biotechnology Co., Ltd.
2020-06-02 Potassium benzoate Joyce
US $50.00 / KG 1KG 99% 20tons Hebei Guanlang Biotechnology Co., Ltd.
2018-12-25 Potassium benzoate
US $1.00 / kg 1kg 95%-99% 1000kg career henan chemical co

Potassium benzoate Spectrum

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