Purification method and device of ethyl maltol

Abstract

The invention relates to a purification method and device of ethyl maltol. The purification method is characterized in that a No. 1 desalting kettle, a No. 2 desalting kettle and a No. 3 desalting kettle are sequentially connected in series in front of a sublimation kettle; the purification method comprises the following steps of: a, conveying centrifuged black oil into the No. 1 desalting kettleand carrying out layering; controlling the temperature in the kettle to be 70 to 80 DEG C; after layering, extracting an upper-layer No. 1 desalting mother solution to obtain the ethyl maltol; b, conveying the black oil layered by step a into the No. 2 desalting kettle and controlling the temperature in the kettle to be 70 to 80 DEG C; after layering, conveying an upper-layer No. 2 desalting mother solution into the No. 1 desalting kettle; c, conveying the black oil layered by step b into the No. 3 desalting kettle and controlling the temperature in the kettle to be 70 to 80 DEG C; after layering, conveying an upper-layer No. 3 desalting mother solution into the No. 2 desalting kettle; conveying the lower-layer black oil into the sublimation kettle and carrying out sublimation; returning asublimated mother solution back to the No. 3 desalting kettle for utilization. The purification method and device of the ethyl maltol have the advantages that 1, the sublimation time is shortened to4 h from original 6 h under the condition that sewage is not increased and the yield is increased to 86 percent from 82 percent; 2, the sublimation temperature is reduced, the purity of a product is improved and the economic benefits are obvious.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, relates to the field of ethyl maltol production, in particular to a method and device for purifying ethyl maltol. Background technique [0002] After the hydrolysis reaction in the chlorination section is completed, the pH is adjusted to 2.5-3.0. After the stratification, the lower product black oil contains a large amount of ethyl maltol. In the past, the decompression sublimation operation was directly carried out in the sublimation kettle, but because the black oil was mixed with a large amount of asphalt Impurities and inorganic salts formed after neutralization, a large amount of inorganic salts directly affect the sublimation efficiency, yield and product quality, the existence of inorganic salts directly leads to difficult sublimation operations, long time, high temperature and vacuum requirements, and a large amount of ethyl Maltol cannot be sublimated, and is carried away by im...

AI Technical Summary

Problems solved by technology

[0002] After the hydrolysis reaction in the chlorination section is completed, the pH is adjusted to 2.5-3.0. After the stratification, the lower product black oil contains a large amount of ethyl maltol. In the past, the decompression sublimation operation was directly carried out in the sublimation kettle, but because the black oil was mixed with a large amount of asphalt Impurities and inorganic salts formed after neutralization, a large amount of inorganic salts directly affect the sublimation efficiency, yield and product quality, the existence of inorganic salts directly leads to difficult sublimation operations, long time, high temperature and vacuum requirements, and a large amount of ethyl Maltol cannot be sublimated and is entrained by impurity asphalt and inorganic salts

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