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Production of Sorbic acid

 Name:Sorbic acid

EINECS:203-768-7

Molecular Formula:C6H8O2

CAS Registry Number:110-44-1

Appearance:White crystalline powder 

Molecular Weight:112.13

Density:1.205

Boiling Point:228°C

Melting Point:132-135°C

Flash Point:127°C

Storage Temperature:2-8°C

Solubility:1.6 g/L (20 oC) in water 

Stability:Stability Material saturated with this acid may ignite spontaneously. Incompatible with

strong oxidizing agents. May be light sensitive.

Usage:Mold and yeast inhibitor, fungistatic agent for foods, especially cheeses. To improve

characteristics of drying oils. In alkylated type coatings to improve gloss. To improve milling

characteristics of cold rubber.

Sorbic acid is currently the most widely used acid type food preservatives , under acidic

conditions (PH5-6 less ) to mold , yeast and aerobic bacteria are inhibited, but anaerobic spore

-forming bacteria and acidophilus Lactobacillus almost ineffective . Plastic barrels in the food

industry juice concentrate , the amount shall not exceed 2g/kg; in soy sauce, vinegar, jams ,

hydrogenated vegetable oil , candy , rain dried products , instant soy products , pastries depression,

 bread, cakes, moon cake and instant jellyfish maximum use of lactic acid bacteria beverage

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1.0g/kg; wine and wine in maximum usage 0.6g/kg; protein casings in the more salt , low-salt

 pickles, sauces , preserves, fruit juice ( flavored ) drinks and jelly the maximum use of 0.5g/kg; in

fresh fruits and vegetables and carbonated beverages maximum usage 0.2g/kg; in the food

industry for meat, fish, eggs, poultry products , the maximum usage 0.075g/kg. Furthermore , in

the cosmetics , pharmaceutical and feed also applied.

Yamanashi sorbic aldehyde by oxidation, condensation of acetone with crotonaldehyde

crotonaldehyde and malonic acid condensation with the legal system , but the current domestic

 production of ketene are used . In addition, the butadiene route due to lower raw material costs

and has good development prospects.

( 1 ) butadiene route. Butadiene and acetic acid in the catalyst manganese acetate , 140°C addedcompressed aggregate obtained γ- vinyl -γ- butyrolactone at 100°C, under acidic conditions, γ-

vinyl -γ- butyrolactone obtained sorbic acid hydrolysis .

( 2 ) Method ketene . Catalysts containing phosphoric acid alkyl ester above 700 °C steam

cracking tube stays within 0.3s, the resulting mixture was treated with ammonia gas into

ammonium and sauce catalyst deactivation. Gradual cooling to -30 - 10 °C to remove water ,

acetic acid and acetic anhydride . Crotonaldehyde ketene gas is absorbed , and boron trifluoride

( or zinc chloride , cobalt chloride , etc. ) to form the poly hexene catalyzed -4,5-β- lactone

(referred to as polyester) , polyester in acidic conditions hydrolysis of the crude sorbic acid

 precipitated after cooling , and then 3-4 times the amount of 60% ethanol recrystallization, sorbic

acid .