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Sodium acetate
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Sodium acetate, also known as acetic acid sodium, is an organic compound with the molecular formula CH₃COONa and a molecular weight of 82.03. The trihydrate form of sodium acetate appears as white crystals, with the molecular formula CH₃COONa ·3H₂O and a molecular weight of 136.08, a relative density of 1.45, a melting point of 58°C, and it weathers in dry air, losing crystallization water at 120°C and decomposing at higher temperatures; anhydrous sodium acetate is a colorless transparent crystal with a melting point of 324°C and is easily soluble in water.
Liquid sodium acetate and solid trihydrate sodium acetate are mainly used to supplement organic carbon elements in the biological denitrification process of wastewater and sewage, with the following advantages:
1. Sodium acetate is a low molecular weight organic salt that is easily decomposed and utilized by microorganisms.
2. As an external carbon source, it has a fast denitrification response time and can be used as an emergency carbon source.
3. Sodium acetate produced by wet methods will hydrolyze when used in water, resulting in an alkaline solution that can adjust pH.
Uses
1. Food industry: commonly used as a flavoring agent and preservative, it can extend the shelf life of food and improve flavor, such as in the production of soy sauce, vinegar, jam, and other foods.
2. Pharmaceutical industry: an important component of many drugs, clinically used for various medical treatments.
3. Cosmetics industry: can adjust pH and is used as a moisturizing agent.
4. Industrial sector: used in the manufacture of dyes, fragrances, plastics, and other chemicals, and also in metal surface treatment.
5. Water treatment sector: can enhance the denitrification capacity of biological treatment systems in wastewater treatment plants, serving as an external carbon source to address the issue of insufficient carbon sources in low-carbon high-nitrogen wastewater.Implementation standard (HG/T5959-2021):
Indicator name
Indicator
Type I
Type II Mass fraction of sodium acetate (CH₃COONa) /% ≥
20.0
25.0 Density (20℃)/(g/cm³) ≥
1.10
1.12 Chemical oxygen demand (CODcr), mg/L ≥
1.56*10⁵
1.95*10⁵ COD conversion ratio
0.70～0.76
pH value
7.5~9.0
Mass fraction of total phosphorus (as P) /% ≤
0.0005
Mass fraction of ammonia nitrogen (as N) /% ≤
0.001
Mass fraction of insoluble substances in water /% ≤
0.05
Mass fraction of chlorides (as Cl) /% ≤
0.10
Mass fraction of arsenic (As) /% ≤
0.0005
Mass fraction of mercury (Hg) /% ≤
0.00002
Mass fraction of chromium (Cr) /% ≤
0.0005
Mass fraction of cadmium (Cd) /% ≤
0.0002
Mass fraction of lead (Pb) /% ≤
0.0005
Chemical oxygen demand converted to sodium acetate ratio
Enterprise standard: Trihydrate sodium acetate (solid)
Testing items
Unit
Test results
Method standard
Appearance
/
White solid
GB/T694-2015(3)
Content (CH₃COONa) ≥
%
58
GB/T694-2015(5.2)
Clarity test ≤
/
3
GB/T694-2015(5.4)
pH (50g/L, 25℃)
/
7.5-9
GB/T9724-2007
Insoluble substances ≤
%
0.003
GB/T694-2015(5.5)
Chlorides (Cl) ≤
%
0.001
GB/T694-2015(5.6)
Sulfates (SO4) ≤
%
0.003
GB/T694-2015(5.7)
Phosphates (PO4) ≤
%
0.0005
GB/T694-2015(5.8)
Iron (Fe) ≤
%
0.001
GB/T694-2015(5.13)
Heavy metals (as Pb) ≤
%
0.00
GB/T9735-2008
COD
mg/g
539
HJ828-2017
Henan Dingxin Metallurgical Technology Co., Ltd. sodium acetate products:
Trihydrate sodium acetate: Mass fraction of sodium acetate (CH₃COONa) /%: 58%-60%
Type I liquid sodium acetate: Mass fraction of sodium acetate (CH₃COONa) /%: ≥20%
Type II liquid sodium acetate: Mass fraction of sodium acetate (CH₃COONa) /%: ≥25%
Product features:
All raw materials used in the product are of high quality, ensuring better product quality.
Packaging and storage:
The solid is packaged in 25Kg bags, using plastic woven bags for packaging, while liquids are transported and sold in tank trucks and ton barrels.
Products should be stored in a dry, ventilated, and cool indoor place, and must not be stored together with flammable, corrosive, or toxic items.
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