Ethyl L(-)-lactate Liquid Raw Materials CAS 687-47-8

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Uses and synthesis of Ethyl L(-)-lactate Liquid

Ethyl L(-)-lactate Liquid is a chemical substance with the molecular formula C5H10O3.Ethyl L(-)-lactate CAS 687-47-8 is a colorless, transparent liquid with a strong alcoholic odor.

Ethyl L(-)-lactate Raw Materials Soluble in ethanol, ether. Miscible with water.

Ethyl L(-)-lactate Raw Materials Used as food flavoring agent, wine flavoring agent, pharmaceutical intermediates.

Applications / Functions of Ethyl L(-)-lactate Liquid

• Ethyl L(-)-lactate CAS 687-47-8 Used as food flavoring agent, wine flavoring agent, pharmaceutical intermediates
• Ethyl L(-)-lactate Liquid is China's regulations allow the use of edible spices, commonly used in the modulation of fruity, frankincense-type edible and wine flavors. The dosage according to the normal production needs, generally in the alcoholic beverages 1000mg/kg; chewing gum in 580 ~ 3100mg/kg; baked goods in 7lmg/kg; candy in 28mg/kg; cold drinks in 17mg/kg.
• Ethyl L(-)-lactate Liquid is a nitrocellulose and acetic acid fiber solvent, and is also a high-level solvent for artificial pearls.Ethyl L(-)-lactate CAS 687-47-8 has the aroma of wine aroma. Used in the formulation of wine flavors and edible flavors.
• Ethyl L(-)-lactate Raw Materials Used as a solvent for nitrocellulose and acetic acid fiber, also used in the fragrance industry.

Physicochemical Property of Ethyl L(-)-lactate Liquid

Colorless transparent liquid, with strong wine flavor odor. E(thyl L-)-lactate Liquid is soluble in ethanol and ether. Miscible with water.

Production methodprocess of Ethyl L(-)-lactate Liquid

Lactic acid and excess ethanol are heated and refluxed in the presence of sulfuric acid for several hours to produce Ethyl L(-)-lactate Liquid.

1. Metal halide catalytic method was used to catalyze the synthesis of Ethyl L(-)-lactate CAS 687-47-8 by replacing concentrated sulfuric acid with metal halide in 65%-71% yield.
2. Rare earth compounds catalytic method of ethanol 0.22 ~ 0.33mol, lactic acid 0.1lmol, with aqueous agent 25mL and rare earth compounds (and acid molar ratio of 1:100) added to the flask, reflux reaction 2.5 ~ 3h. Reaction liquid evaporation of excess ethanol, with aqueous agent and un-reacted lactic acid distillation under reduced pressure, the collection of the product, the yield of 74% ~ 79%.
3. Sulfuric acid catalyzed method in the sulfuric acid catalyzed lactic acid and excess ethanol esterification and ethyl lactate; can also be heated in carbon tetrachloride reflux dehydration for 24h, distillation at atmospheric pressure to recover excess ethanol, and then distilled under reduced pressure Ethyl L(-)-lactate Raw Materials .
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5. Solid acid catalytic method NaY molecular sieve by washing, drying, high temperature scorching, and then a certain concentration of NH4C1 solution stirring heating impregnation, ion exchange, NH4Y filtration, washing, drying, high temperature activation at 550 ° C, that is, the solid acid HY. Then lactic acid, ethanol, benzene, HY will be added to the reaction bottle, HY/lactic acid = 25/100 (mass), lactic acid / ethanol (moles) = 1/ 3. The reaction was carried out at 100-160°C with reflux splitting for 8-10h, and the esterification rate was more than 60%.
6. Distillation esterification method 225g of 80% lactic acid, 475mI.(380g) of 95% ethanol, 100mL of benzene, 2mL of concentrated sulfuric acid and a little zeolite were added to a flask (1000mL) of a water-splitting distillation apparatus. The reaction solution was heated to boiling, and the vapors (ethanol, benzene and water) entered the condenser after passing through the distillation column, and then returned to the distillation column after separating out the aqueous layer, and the temperature at the top of the column was stabilized at 64.9℃. When divided out of the water layer 240g (which contains 119g of ethanol, 99g of water, benzene 22g), basically no water out of the column top temperature rose to 68 ℃, the end of esterification. After the reaction solution was cooled, 6g of anhydrous sodium acetate was added to neutralize the sulfuric acid, and distillation was carried out under reduced pressure. First full reflux for 1h, and then under the vacuum of 2.45kPa, control reflux ratio was not less than 5, the temperature at the top of the column was 58 ℃, and the colorless and clear Ethyl L(-)-lactate CAS 687-47-8 226g was distilled out, the yield was 96%.

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