Refining method of spice benzyl acetate

Abstract

The embodiment of the invention discloses a refining method of spice benzyl acetate. The method comprises the steps of acid pickling: preparing a sodium hydrogen sulfite solution in an acid / alkali washing kettle, feeding a common benzyl acetate finished product, stirring, settling for layering, extracting an oil phase, carrying out chromatographic analysis on the oil phase, discharging acid waterin a water-phase into an acid water storage tank, and leaving the oil phase into the acid / alkali washing kettle; alkali washing: adding a sodium carbonate solution into the acid / alkali washing kettle,stirring, settling for layering, extracting an oil phase, detecting an acid value of the oil phase, discharging alkali water in the water-phase into an alkali water storage tank; distilling: pumpingthe alkali-washed oil phase into a distillation still, carrying out reduced pressure distillation, sampling, carrying out chromatographic analysis and moisture measurement analysis on the sample, closing jacket steam, and packaging benzyl acetate in a distillation still. According to the refining method of the spice benzyl acetate provided by the invention, benzaldehyde in the benzyl acetate is removed by utilizing the low-cost acid / alkali washing method, so that the quality of the benzyl acetate is improved, the acid water and the alkali water incapable of being recycled are transferred to atriple effect evaporator so as to be treated and recycled, the method is environmentally-friendly and water-saving.

Description

technical field [0001] The present invention relates to the production refining field of benzyl acetate, in particular to a kind of refining method of perfume benzyl acetate. Background technique [0002] Benzyl acetate is a kind of ester fragrance, which has fruity fragrance and jasmine fragrance. It is commonly used in the preparation of food flavors such as apple, raw pear, banana, cherry, plum and pineapple in the fragrance industry. In the daily chemical industry, it is used as a solvent for shellac, alkyd resin, nitrocellulose, cellulose acetate, dyes, grease and printing ink. In addition, it is widely used in the textile and dye industries. With the development of the domestic food processing industry and people's higher requirements for food color and aroma, the demand for benzyl acetate is also increasing year by year. [0003] The synthetic method of benzyl acetate has many kinds, and a kind of method wherein is prepared by the reaction of dibenzyl ether and acet...

AI Technical Summary

Problems solved by technology

[0003] The synthetic method of benzyl acetate has many kinds, and a kind of method wherein is prepared by the reaction of dibenzyl ether and acetic anhydride, and this method does not have the aftertreatment problem that by-product causes, and product is excellent, but in benzyl acetate rectifying stage, Because benzaldehyde and benzyl acetate have close boiling points, it is difficult to separate a small amount of benzaldehyde from benzyl acetate. A small amount of benzaldehyde will affect the smell of benzyl acetate. At the same time, benzaldehyde is easily oxidized into benzoic acid, which will also affect acetic acid. Acid value and color of benzyl esters