What Is Sodium Acetate?

Sodium acetate is generally present as sodium acetate trihydrate with three crystal waters. Sodium acetate trihydrate is colorless and transparent or white crystals, which can be weathered and combustible in the air. Soluble in water, slightly soluble in ethanol, insoluble in ether. Loss of crystal water at 123 ° C. However, it usually has the taste of acetic acid. Hydrolysis occurs in water.

CAS number: 127-09-3

MDL number: MFCD00012459

EINECS number: 204-823-8

RTECS number: AJ4300010

BRN number: 3595639 ^[1]

1. Properties: colorless transparent crystal or white particles

2. Relative density: 1.45 (trihydrate); 1.528 (anhydrous)

3. Refractive index: 1.464

4. Melting point (° C): 324

5. Solubility: easily soluble in water, slightly soluble in ethanol and ether. ^[1]

1. Reference value for calculation of hydrophobic parameters (XlogP): None

2. Number of hydrogen-bonded donors: 0

3. Number of hydrogen bond acceptors: 2

4. Number of rotatable chemical bonds: 0

5. Number of tautomers: none

6. Topological molecular polar surface area: 40.1

7, the number of heavy atoms: 5

8. Surface charge: 0

9. Complexity: 34.6

10. Number of isotope atoms: 0

11. Determine the number of atomic stereocenters: 0

12. Uncertain number of atomic stereocenters: 0

13. Determine the number of chemical bond stereocenters: 0

14. Uncertain number of chemical bond stereocenters: 0

15. Number of covalent bond units: 2 ^[1]

1. Skin / eye irritation: Standard Derez eye staining test for rabbit skin: 500mg / 24H has slight irritation to the skin.

Standard Drays eye staining test for rabbit eyes: 50ug / 24H has slight irritation to eyes.

2. Acute toxicity:

Oral LD5O in rats: 3530mg / kg

LC5O inhaled by rats:> 30gm / m ³ / 1H

Oral LD5O in mice: 6891mg / kg

Subcutaneous LD5O in mice: 3200mg / kg

Intravenous injection of LDLO in mice: 1195mg / kg

Rabbit skin LD5O:> 10gm / kg

Intravenous injection of LDLO in rabbits: 1300mg / kg ^[1]

1. Sealed and stored dry.

2. Pack in lined plastic bags, outer woven bags or sacks. Sodium acetate has deliquescent properties. Pay attention to moisture resistance during storage and transportation. It is strictly forbidden to contact with corrosive gas, prevent exposure to sunlight and rain, and transport it with rainproof cover. ^[1]

1. Place sodium acetate trihydrate in a porcelain dish and heat at 120 ° C until a dry white substance is obtained to obtain anhydrous sodium acetate.

In organic synthesis, for example, when methane is prepared by co-melting anhydrous sodium acetate and soda lime, the anhydrous sodium acetate used should be prepared just before use. Place an appropriate amount of sodium acetate trihydrate in a porcelain evaporating dish and heat it to about 58 ° C with stirring on a glass rod. Sodium acetate trihydrate dissolves in the crystal water, and the water gradually evaporates to obtain a white solid. . Continue heating until the solid melts, but the temperature should not exceed the melting point of sodium acetate (324 ° C), so as not to decompose the sodium acetate into acetone and sodium carbonate. Cool slightly with stirring, grind in a mortar while hot, and immediately store in a closed container for later use.

2. Neutralize acetic acid with crystalline sodium carbonate, filter, evaporate, cool, crystallize, and dry at room temperature.

3. Calcium acetate is treated with sodium sulfate and sodium bicarbonate.

4. There are many production methods of sodium acetate, which can be obtained by dilute acetic acid or calcium acetate with soda ash; it can also be obtained by metathesis of sodium sulfate and calcium acetate. The industry also often uses scraps from pharmaceutical and perfumery factories to recover sodium acetate. 628 kg of dilute acetic acid was poured into the reactor, and 200 kg of soda ash was added to the reactor in portions. Without stirring, start the induced draft fan to extract air. After the reaction is stable, start stirring to make the soda ash and acetic acid fully react, then drive into the evaporator to heat and concentrate until the liquid density is 1.24 g / cm ³ and stop heating. The reaction solution was filtered and driven into a crystallizer. The pH was adjusted to 9.2 with NaOH, and the crystal was cooled to 35 ° C. The surface mother liquor was removed and the crystals were dried to obtain 350 kg of a white powdery product. The primary yield is about 70%. ^[1]

1. Determination of lead, zinc, aluminum, iron, cobalt, antimony, nickel and tin. Complexation stabilizer. Acetylation aids, buffers, desiccants, mordants.

2. Used for the determination of lead, zinc, aluminum, iron, cobalt, antimony, nickel, tin. Used as esterification agent for organic synthesis, as well as photographic medicine, medicine, printing and mordant, buffering agent, chemical reagent, meat antiseptic, pigment, tanning leather, etc.

3. Used as a buffering agent, flavoring agent, flavoring agent and pH regulator. As a buffering agent for flavouring agents, 0.1% to 0.3% can be used when mitigating bad odor, preventing discoloration and improving flavor. Has certain anti-mildew effect, such as the use of 0.1% to 0.3% in minced fish products and bread. Can also be used as a sour sauce, sauerkraut, mayonnaise, fish cakes, sausages, bread, sticky cakes and other sour agents. It is mixed with methylcellulose and phosphate to improve the preservation of sausages, breads, stickies, etc.

4. Used as an anti-scorching agent for sulfur-adjusted neoprene coking. The amount is generally 0.5 parts by mass. It can also be used as a cross-linking agent for animal glue.

5. This product can be used for the addition of alkaline electroplating tin, but it has no obvious effect on the coating and electroplating process, and is not an essential component. Sodium acetate is often used as a buffering agent, such as for acid zinc plating, alkaline tin plating and electroless nickel plating. ^[1]