Ethyl lactate (Ethyl lactate)

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Ethyl lactate

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Acytol
lactic acid ethyl ester
dl-ethyl lactate
EthyI lactate
Actylol
FEMA 2440
Ethyllactat
Solactol
Eusolvan
yl lactate
ethyl 2-hydroxypropionate
Purasolv ELS
2-hydroxypropanoic acid ethyl ester

+Expand -Stow

97-64-3

C5H10O3

118.131

2918110000

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Nature Description

1.03

151oC

-26oC

46oC

1.4124

Product Applications

Use of ethyl lactate (97-64-3): It is a kind of edible spice permitted by our regulations, which is often used to prepare fruit flavor, lactic acid flavor and wine flavor. Dosage according to the needs of normal production, generally 1000 mg/kg in alcoholic beverages, 580-3100 mg/kg in chewing gum, 71 mg/kg in baked food, 28 mg/kg in candy, 17 mg/kg in cold drinks. It is used as solvent for nitrocellulose and acetate fiber, and also used in perfume industry.

Production method

1. Metal halide catalytic method. Ethyl lactate was synthesized by replacing strong sulphuric acid as catalyst with metal halide, and the yield was 65-71%.

2. Rare earth compound catalytic method. Add 0.22-0.33mol of ethanol, 0.11mol of lactic acid, 25ml of water-carrying agent and rare earth compound (the molar ratio of acid to acid is 1:100) to the flask, Reflux reaction 2.5-3H, the reaction solution was distilled under reduced pressure after steaming the amount of ethanol, water-carrying agent and unreacted lactic acid, and the product was collected. The yield was 74-79%.

3. Sulfuric acid catalytic method. Under the catalysis of sulfuric acid, lactic acid and excess ethanol are reacted to obtain ethyl lactate; It can also be heated in carbon tetrachloride and dehydrated for 24 hours. The excess ethanol is recovered by atmospheric distillation, and then the finished product is distilled under reduced pressure.

4. Solid acid catalytic method. NaY molecular sieve is washed with water, dried and burned at high temperature, and then stirred and impregnated with NH4Cl solution with a certain concentration for ion exchange. NH4Y is filtered, washed and dried, and activated at 550℃ at high temperature to obtain solid acid HY. Then add lactic acid, ethanol, benzene and HY to reaction bottle, HY/lactic acid (mass ratio) = 25/100, lactic acid/ethanol (molar ratio) = 1/3. Under the reflux water separation reaction at 100-160 ℃ for 8-10 hours, the ester rate is over 60%.

5. Distillation and transesterification. 225g of 80% lactic acid, 475mL (380g) of 95% ethanol, 100mL of benzene, 2 mL of concentrated sulfuric acid and a little zeolite were added to the flask (1000 mL) of the water separation distillation unit. Add the reaction liquid to boiling, steam (ethanol, benzene and water) enters the condenser after passing through the distillation column, separate the water layer and return to the distillation column, and the temperature at the top of the column is stable at 64.9 ℃. When 240g of water layer is separated (including 119g of ethanol, 99g of water and 22g of benzene), it is basically separated without water, and the temperature at the top of the column rises to 68℃, the ester is finished. After the reaction solution is cooled, 6g anhydrous sodium acetate is added to neutralize sulfuric acid, and distillation is carried out under reduced pressure. First, full reflux for 1 hour, then under the vacuum degree of 2.45Kpa, the reflux ratio is controlled not less than 5, the column top temperature is 58℃, and the colorless clear ethyl lactate 226g is distilled, with a yield of 96%.

6. From lactic acid and excess ethanol under the action of catalyst, refined

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