Process for producing gallic acid with gall flower extract and one-step method

A gallic acid and process technology, applied in the field of gallic acid production, can solve the problems of low purity, high raw material requirements, undetermined ratio of hydrolyzed materials, temperature and time conditions, and acidification conditions, etc.

Inactive Publication Date: 2009-05-13
张家界贸源化工有限公司
View PDF1 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A Chinese patent discloses a "method for preparing gallic acid by alkaline hydrolysis of raw materials of Beihua" (ZL93114806.5), which adopts the method of alkaline water alkali to produce gallic acid, and has a good output rate, but due to the lack of an ideal The proportion of hydrolyzed materials, temperature and time conditions, and acidification conditions have high requirements on raw materials. The yield of gallic acid does not exceed 29%, and the purity of the product is not high.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment 1: take by weighing 100 grams of beihua, pulverize, add 500 grams of water and 200 grams of 30% sodium chloride solution, be heated to 100 ° C, hydrolyzed for 2 hours, and the active ingredients of beihua are converted into gallate; hydrolyzate; Transfer to the acidification tank for acidification with hydrochloric acid to make the PH of the hydrolyzate = 2~3; after acidification, the plate and frame are separated directly, the separated material liquid is transferred to the decolorization tank, and 4 grams of activated carbon are added to decolorize at 85 ° C for 30 to 60 minutes, and plate again. Frame pressure filtration, the feed liquid is removed from the crude crystallizing tank for crystallization for 24 hours, decolorized and separated to obtain 32.6 g of crude gallic acid, the gallic acid content is 95.7%, and the product yield is 30.97%.

Embodiment 2

[0010] Embodiment 2: take by weighing 200 grams of beihua, pulverize, add 1200 grams of water and 300 grams of 30% sodium chloride solution, be heated to 102 ° C, hydrolyzed for 2 hours, and the active ingredient of beihua is converted into gallate; hydrolyzed solution Transfer to the acidification tank for acidification with hydrochloric acid, so that the PH of the hydrolyzate is 2 to 3; after acidification, the plate and frame are separated directly, the separated material liquid is transferred to the decolorization tank, and 9 grams of activated carbon are added to decolorize at 85 ° C for 30 to 60 minutes, and plate again. Frame pressure filtration, the feed liquid is removed from the crude crystallizing tank for crystallization for 24 hours, decolorized and separated to obtain 62.8 grams of crude gallic acid, the content of gallic acid is 95.2%, and the product yield is 29.8%; the crude gallic acid product is qualified and then decolorized and refined in the refining worksh...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a process for producing gallic acid through a one-step method of gall flower. Gall flower is added with water and 30 percent sodium chloride solution, is hydrolyzed and is acidified through hydrochloric acid for hydrolysis to ensure that PH value is between 2 and 3; and after acidification, the mixture is subjected to plate-frame separation for two times, coarseness removal through a discoloring material liquid and crystallization to obtain a coarse product of the gallic acid. The invention adopts a new process for producing the gallic acid through adopting the one-step method of the gall flower; the consumption of the gall flower is reduced from the prior 10T / T to 6T / T; the highest yield of the gallic acid can reach over 29 percent; and the content of the gallic acid in the coarse product reaches over 95 percent.

Description

technical field [0001] The invention relates to the field of forest products chemical industry, and in particular, provides a process for producing gallic acid by utilizing Galla japonica. Background technique [0002] It is very difficult to produce gallic acid due to its low content. The traditional production of gallic acid mainly adopts the method of thermal hydrolysis or acid hydrolysis. Even if gallic acid products are produced, due to poor quality and high cost, can not meet the needs of the market. As a result, the application work of Beihua has been unable to be widely promoted, and the value of resources has not been reflected. Many factories in China have tried to extract tannin from beihua, and then produce gallic acid from tannin. Although the route is feasible, the cost remains high and the product has no market competitive advantage, so it has not been popularized. A kind of "method for preparing gallic acid by alkali hydrolysis of double flower raw material...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C07C65/03C07C51/42A61K35/64
Inventor 陈学勇汤先赤汤赫
Owner 张家界贸源化工有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap