A kind of preparation method of fatty acyl lactic acid or its salt
A technology of fatty acyl lactylate and fatty acyl lactic acid, which is applied in the field of fine chemical preparation, can solve problems affecting product quality and downstream applications, and achieve high yield and low loss
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Embodiment 1
[0026] Put 220g of 90% lactic acid aqueous solution in a four-necked flask, stir at 40°C, evacuate to a pressure of 2kPa, hold for 2h, put in 284g of stearic acid, stir for 0.5h, put in a solid-phase composite catalyst formed by loading NaOH on 4A zeolite 4g. The temperature was raised to 200°C, reacted for 2 hours at a pressure of 10 kPa, neutralized by adding NaOH, the catalyst was recovered by filtration, cooled, and discharged to obtain sodium stearoyl lactylate.
[0027] At the same time, according to the literature method: Geng Min et al. [Chinese Journal of Cereals and Oils, 2007(06): 157-159] conducted a control experiment, put 220g of 90% lactic acid into a four-neck bottle, add 21.2g of anhydrous sodium carbonate to neutralize, and stir until No bubbles were generated, heated to 235 ° C, put in 284 g of stearic acid, stirred at a constant temperature for 3 hours, cooled, and discharged to obtain a control sample.
[0028] Measure the mass percentage of stearic acid ...
Embodiment 2
[0032] Preparation of Solid Catalyst: Weigh Na 2 CO 3 20g, add 30g of distilled water, stir to dissolve, add 80g of 4A zeolite, put it on a constant temperature heating magnetic stirrer at 40℃ for 2 hours, let it stand for 1 hour, put it in an oven at 105℃ to dry the water, and then transfer it to 500℃ Dry in the muffle furnace for 2h, and cool to room temperature to obtain Na 2 CO 3 Solid-phase composite catalyst supported on 4A zeolite.
[0033] Synthesis of sodium lauroyl lactylate: put 180g of 50% lactic acid aqueous solution in a four-necked flask, stir at 20°C, evacuate to a pressure of 0.5kPa, hold for 0.5h, put in 190g of lauric acid, stir for 1h, put in 42g of the above catalyst. The temperature was raised to 140°C, reacted for 4 hours under the pressure of 10kPa, neutralized by adding NaOH aqueous solution, the catalyst was recovered by filtration, cooled, and discharged to obtain an aqueous sodium lauroyl lactylate solution. The reaction process does not use or...
Embodiment 3
[0036] Put 307kg of 88% lactic acid into the reaction kettle, stir at 30°C, evacuate to a pressure of 1kPa, hold for 1h, put in 250kg of myristic acid, stir for 0.5h, put in CaCO 3 52kg of solid-phase composite catalyst supported on 4A zeolite, heated to 190°C, reacted at a pressure of 20kPa for 6h, and added Ca(OH) 2 Neutralization, filtration recovery of catalyst, cooling, discharging to obtain calcium myristoyl lactate product.
[0037] The content of myristic acid (calcium) in the product was determined, and the conversion rate was calculated to be 85.2%.
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