Method for preparing low acid-value fatty acid methyl ester
A technology of fatty acid methyl ester and low acid value, which is applied in the preparation of carboxylate, sulfonate, organic compound, etc. It can solve the problems of long reaction time, many by-products, equipment corrosion, etc., and achieve simple preparation process , high reactivity and low production cost
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Embodiment 1
[0025] Weigh 35g 732 type cation exchange resin and 100g lauric acid (acid value 278.1mgKOH / g) in a 500mL three-necked bottle, place in a constant temperature oil bath, and install a thermometer, constant pressure dropping funnel, distillation Condenser, the end of the distillation condenser is connected to a vacuum pump; when the system temperature reaches 50°C, anhydrous methanol is slowly added through a constant pressure dropping funnel at a rate of about 10mL / h, and the vacuum pump is turned on to maintain a reaction pressure of 10Kpa. After reacting for 4 hours, the catalyst was filtered off, and excess methanol and generated water were further distilled off under reduced pressure to obtain methyl laurate with an acid value of 0.60 mgKOH / g and an esterification conversion rate of 99.78%.
Embodiment 2
[0027] Weigh 50g D001 type catalytic resin and 100g lauric acid (acid value 278.1mgKOH / g) in a 500mL three-necked bottle, place in a constant temperature oil bath, and install a thermometer, a constant pressure dropping funnel, a distillation condensing The end of the distillation condenser tube is connected to a vacuum pump; when the system temperature reaches 60°C, turn on the vacuum pump to maintain the reaction pressure at 30Kpa. Anhydrous methanol was slowly added through a constant pressure dropping funnel at a rate of about 15 mL / h. After reacting for 5 hours, the catalyst was filtered off, and the catalyst was washed with hot anhydrous ethanol three times, filtered, dried at 70°C, and recovered. The filtrate was further distilled off under reduced pressure to remove excess methanol and generated water to obtain methyl laurate with an acid value of 0.48 mgKOH / g and an esterification conversion rate of 99.82%.
Embodiment 3
[0029] Weigh 5g of p-toluenesulfonic acid and 100g of palmitic acid (acid value 218.3mgKOH / g) in a 500mL three-necked bottle, place it in a constant temperature oil bath, and install a thermometer, a constant pressure dropping funnel, a distillation condensing tube; when the temperature of the system reaches 55°C, keep the reaction pressure at 90Kpa, add anhydrous methanol slowly through the constant pressure dropping funnel, and the dropping rate is about 20mL / h. After reacting for 6 hours, the catalyst was filtered off. The catalyst was washed three times with hot absolute ethanol, filtered, dried at 70°C, and recovered. The filtrate was further distilled off under reduced pressure to remove excess methanol and generated water to obtain methyl laurate with an acid value of 0.52 mgKOH / g and an esterification conversion rate of 99.76%.
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