It is managed esterification of glycerol as well as stearate. Include stearic acid, glycerin and additionally salt hydroxide right into the reaction pot, warmth and also thaw, begin mixing, as well as existing nitrogen. Heating along with reacting at 185 ° C for 7h, pH must be less than 5 at the end of the response. Cool off as well as launch to obtain glycerol monostearate. Each ton of product absorbs greater than 82kg of stearin and also 235kg of glycerin (over 95%).
right esterification
Stearic acid and also glycerol stay in a molar ratio of 1:-LRB- 1.2 ～ 1.3), under the activity of 0.2% acidic energizer, at 180 ～ 250 ℃: respond for 2 ～ 4h; the stimulant is rapidly cooled down to 100 ℃, in addition to antacid is added to combat the stimulant, After cleansing with water, a thing containing 40% to 60% of monoester can be gotten.
Transesterification
Glyceryl stearate as well as glycerol are reacted at 170-240 ℃ for 1-2h in the presence of 0.06% -0.1% Cu( OH) 2. Throughout the reaction, nitrogen is presented for security. The item including 40% to 60% of monoester can be acquired after mixing and refining.
Glycidol Saponification
Under the catalysis of tetraethylammonium iodide, glycidol as well as stearic acid are reacted at 100 to 130 ° C for 30 to 70 minutes, and also the item having 80% to 90% of monoester can be obtained after the reactants are improved.
Epichlorohydrin Stage Transfer Catalysis
Epichlorohydrin as well as sodium stearate (2:1, molar percentage) in toluene, under the catalysis of phase transfer catalyst tetrabutylammonium bromide, respond at 90 ～ 110 ℃ for 2h; the catalyst is sodium chloride solution Tidy, different the all-natural stage, get rid of toluene in addition to unreacted epichlorohydrin by distillation to obtain glycidyl stearate, hydrolyze it with 0.1 mol/L NaOH service, various, entirely dry, as well as additionally recrystallize with n-hexane to obtain the item, the monoester product is above 90%. Monoester products with an internet content of 40% to 60% can obtain high focus items of greater than 90% by molecular filtration.
