Method and device for extracting tannin from dogwood to prepare blue dye

• Main Authors: ZHANG TINGTING, GUO MING, JING YANWEI, HE YU, LU YONGQUAN, DONG QINGQING, WU RONGHUI, SHEN CHENG, LUO ZIHAO
• Format: Patent
• Language: Chinese; English
• Published: 17.03.2023
• Subjects: ADHESIVES; CHEMISTRY; DERIVATIVES THEREOF; DYES; LAKES; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; MORDANTS; NATURAL RESINS; NUCLEIC ACIDS; NUCLEOSIDES; NUCLEOTIDES; ORGANIC CHEMISTRY; ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES; PAINTS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; POLISHES; SEPARATION; SUGARS; TRANSPORTING

The invention discloses an inert gas ultrasonic-assisted separation and extraction device which comprises an ultrasonic heating device, an inert gas generation device, a distillation device and a condensation receiving device, the invention also discloses a method for extracting the dye from the dogwood fruits by using the device. The method comprises the following steps: cleaning the dogwood fruits, drying and crushing; adding the crushed dogwood fruits and the extraction solvent into a distillation flask for ultrasonic treatment, and continuously introducing inert gas into the distillation flask in the ultrasonic treatment process; concentrating the obtained dogwood extracting solution, and centrifuging the concentrated dogwood fruit extracting solution to obtain supernate; adding 3 +/-0.1 g of ferrous sulfate heptahydrate into every 10 g of supernatant obtained by crushing the dogwood fruits, and dissolving to obtain the bluish violet dye. The method is green and environment-friendly, and the obtained dye