Method for separating and purifying vitamin C palmitate from reaction liquid of direct esterification method

The invention relates to a method for separating and purifying vitamin C palmitate from reaction liquid of a direct esterification method, and the method applied to separation and purification fields of the reaction liquid. The separating and purifying method comprises the following steps of: reacting vitamin C with palmitic acid under catalysis of concentrated sulfuric acid, so as to obtain the reaction liquid of the vitamin C palmitate; slowly pouring the reaction liquid into ice-bath cooling water or trash ice, adding methylbenzene to carry out extraction, and carrying out standing and layering to separate out a lower-layer waste acid layer and leave a methylbenzene layer; adding water into the methylbenzene layer, carrying out crystallization and filtering so as to obtain a filter cake, and respectively washing the filter cake by utilizing proper amount of methylbenzene and water; adding the filter cake into the water and stirring for 0.5-3 hours, filtering, and carrying out water washing until the pH of the effluent water is 6-7, so as to obtain crude products of the vitamin C palmitate; and carrying out recrystallization on the crude products of the vitamin C palmitate by utilizing ethanol so as to obtain finished products of the vitamin C palmitate. The method for separating and purifying the vitamin C palmitate from the reaction liquid of the direct esterification method has the advantages that solvents are simply separated and purified, are low in toxin and can be recycled, the separation and purification cost is low, the product purity is high, the condition is mild and the operation is simple and convenient.