FIELD: technology treatment of vegetable raw.
SUBSTANCE: invention relates to a method for producing a nutritive dye from vegetable raw. Invention describes a method for preparing quercetin dye that involves mixing onion husk with milled coniferous tree bark, extraction of mixture with liquid extractant and its concentrating. Liquid ammonia is used as an extractant and extraction is carried out under pressure above atmosphere. In the process of extraction pressure is dropped periodically to value providing boiling ammonia and then recovered to the parent value. Method allows enhancing quality of dye due to reducing ash content up to 0.4% and the content of turpentine in it up to 0.6-1.2% in simultaneous reducing technological cycle time.
EFFECT: improved producing method.
1 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF DYE PREPARING FROM THE ONION PEEL | 1993 |
|
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