Method for recovering erythritol from erythritol crystallization mother liquor

Abstract

The invention discloses a method for recovering erythritol from erythritol crystallization mother liquor. The method is characterized by comprising the following steps: 1, pre-treating: diluting the erythritol crystallization mother liquor by pure water, so as to obtain the diluted solution containing 30 to 50% of Brix; 2, filtering by a ceramic membrane: filtering the diluted solution by the ceramic membrane which has the separation aperture of 20 to 100 nanometers, so as to obtain the ceramic membrane filtering dialyzate; 3, nano-filtering: treating the ceramic membrane filtering dialyzate obtained in step 2 by non-filtering through a Dalton nanofiltration membrane with molecular weight cutoff of 150 to 350, so as to obtain the nano-filtering dialyzate; and 4, concentrating and crystallizing: concentrating the nano-filtering dialyzate in vacuum, and then crystallizing to obtain erythritol crystal containing more than 99.5% of erythritol. By adopting the technical scheme, the method has the beneficial effects that the Dalton nanofiltration membrane with molecular weight cutoff of 150 to 350 is adopted, and the processes such as purifying and decolorizing can be realized by one step, so that the production technology is simplified, the production cost is reduced, and the advantage of being high in product yield is brought.

Description

technical field [0001] The invention relates to the field of erythritol extraction, in particular to a method for recovering erythritol from erythritol crystallization mother liquor. Background technique [0002] Erythritol is a low-calorie tetraol with a sweetness of 60-80% of sucrose. Its chemical name is 1,2,3,4-butanetetraol, and its calories are only one-tenth of that of sucrose. Sugar alcohol has the advantages of low energy value, high tolerance, no toxic side effects, edible for diabetics and non-cariogenic properties. In recent years, it has been widely used in functional foods such as low sugar and health care. Also versatile. At present, the industrial production of erythritol is mainly realized through microbial fermentation. [0003] The erythritol crystallization mother liquor refers to the brown-black mother liquor produced after repeated crystallization and extraction of fermented yeast liquid in the production process of erythritol, and its mass content of...

AI Technical Summary

Problems solved by technology

However, in actual use, we have found that because the erythritol crystallization mother liquor Brix and COD are particularly high, using the above method to filter with an organic ultrafiltration membrane will easily pollute the ultrafiltration membrane, reduce the membrane flux, and after cleaning, The flux is difficult to recover, and the cost of cleaning agent is high. In addition, the nanofiltration membrane with a molecular weight cut-off of 500D-800D is used. The treated nanofiltration dialysate needs to be decolorized by activated carbon and ion exchange, which makes the whole process cumbersome and the production cycle is long. , and increased production costs

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