Processing method for mother liquid in maltol production and device thereof

Abstract

The invention relates to a mother liquid processing method during the production of maltol (and ethyl maltol) and a device used for realizing the method, and the invention is characterized in that mother liquid in a mother liquid tank (1) and an extractant chloroform in a chloroform tank (15) are sent respectively by a flow ratio of 20:1 into the upper part and the lower part of an extraction tower (4) by a pump (2) and another pump (17), and the two phases of the chloroform and mother liquid are countercurrently contacted in the extraction tower due to gravity difference, then little amount of maltol in the mother liquid is converted into the extractant phase and drained into an accumulator tank (7) from the bottom of the tower and the mother liquid is drained into a waste liquid tank (20) form the top of the tower. The extractant phase containing maltol is sent into a distiller (9) and heated at the temperature of 90 DEG C to steam out chloroform which is condensed in a condenser (13) and sent into the chloroform tank (15) for recycling. The surplus maltol in the distiller (9) enters a refrigerating kettle (11) and is freezed at the temperature of about 10 DEG C to crystallize out the maltol, the half-finished product of the maltol is taken out and processed through a sublimating process.

Description

Technical field: [0001] The invention relates to a method for treating mother liquor in the production of Guangpu flavor enhancer maltol (and ethyl maltol) and a device for realizing the method. Background technique: [0002] Maltol (and ethyl maltol) is a broad-spectrum flavor enhancer with a pleasant burnt-sweet aroma, widely used in daily chemical, beverage, food, medicine, tobacco, wine and other fine chemical fields. [0003] For the production of maltol, manufacturers at home and abroad mainly adopt the furfural route. The production process is as follows: magnesium and alkyl halides react to synthesize Grignard reagents in the presence of anhydrous ether or tetrahydrofuran solvents, and then Grignard reagents react with furfural. The furfuryl alcohol intermediate is obtained by hydrolysis; the furfuryl alcohol intermediate after the separation of the solvent is chlorinated with chlorine gas at a low temperature in methanol aqueous solution, and then heated and hydroly...

AI Technical Summary

Problems solved by technology

[0008] The original chlorination and neutralization mother liquor (the aqueous solution of the chlorination hydrolyzed material plus alkali neutralization, the main components of which are water, sodium chloride, maltol, etc.) Maltol, etc.) are separated by freezing and standing. After the semi-finished product crystallizes out, the mother liquor is sent to the sewage treatment station. The mother liquor still contains about 1% of the semi-finished product, which is wasteful and increases the sewage treatment load.

Extensive searches for the above problems have found no relevant solutions

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