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Method for extracting agar from gracilaria

A technology for gracilaria and agar, applied in the field of extracting agar from Gracilaria, can solve the problems of large water consumption, increased production cost, environmental protection pressure, waste water containing compounds, etc. The effect of reducing pollution

Active Publication Date: 2020-01-10
GUANGDONG OCEAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above-mentioned shortcoming of the prior art, the purpose of the present invention is to provide a kind of method that extracts agar from Gracilaria, is used to solve the large water consumption when extracting agar from Gracilaria in the prior art, produces a large amount of Compound-containing wastewater increases production costs and environmental protection pressures

Method used

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  • Method for extracting agar from gracilaria
  • Method for extracting agar from gracilaria
  • Method for extracting agar from gracilaria

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Weigh 100 kg of dried Gracilaria redus (with a water content of 20%) after removing debris such as mud, sand, pebbles, shells and miscellaneous algae, and set aside. After heating 600 liters of 12.0wt% aqueous sodium hydroxide solution to 65° C., put into Gracilaria gracilola and keep the temperature for 12 hours.

[0066] After the alkali treatment is finished, the lye is discharged and recovered, and the red gracilaria is centrifuged in a centrifuge to continue to recover the lye, and then 800 liters of water is added each time for soaking and cleaning, and a total of 7 washes are made. Finally, the pH of the soaking water is about 6.5, and the red The alkali-removing soaking and cleaning of Gracilaria.

[0067] Cut the cleaned Gracilaria chinensis into 20-30 mm long, put it into a crusher, add 500 liters of water, and crush it until it is in the state of glue and only a small amount of solid matter is visible to the naked eye.

[0068] Add 1,000 liters of water to t...

Embodiment 2

[0073] Weigh 100 kg of dried Gracilaria redus (with a water content of 20%) after removing debris such as mud, sand, pebbles, shells and miscellaneous algae, and set aside. After heating 600 liters of 15.0 wt % sodium hydroxide aqueous solution to 65° C., put into Gracilaria glabra, and keep it warm for 16 hours.

[0074] After the alkali treatment is finished, the lye is discharged and recovered, and the red gracilaria is centrifuged in a centrifuge to continue to recover the lye, and then 800 liters of water is added each time for soaking and cleaning, and a total of 7 washes are made. Finally, the pH of the soaking water is about 6.5, and the red The alkali-removing soaking and cleaning of Gracilaria.

[0075] Cut the cleaned Gracilaria chinensis into 20-30 mm long, put it into a crusher, add 500 liters of water, and crush it until it is in the state of glue and only a small amount of solid matter is visible to the naked eye.

[0076] Add 1,000 liters of water to the glue ...

Embodiment 3

[0081] Weigh 100 kg of dried Gracilaria spp. (with a water content of 20%) after removing debris such as mud, sand, pebbles, shells and miscellaneous algae, and set aside. After heating 500 liters of 25.0% sodium hydroxide solution to 65°C, put into Gracilaria spp., and keep it warm for 16 hours.

[0082] After the alkali treatment time is up, the lye is discharged and recovered, and the fine-grained Gracilaria is centrifuged in a centrifuge to continue to recover the lye, and then 800 liters of water is added each time for soaking and cleaning for 6 to 7 times. The pH of the soaking water is about 6.5, and the fine Soaking and cleaning of base Gracilaria.

[0083] Cut the cleaned Gracilaria spp. into 20-30 mm long, put it into a crusher, add 500 liters of water, and crush until it is in the state of glue and only a small amount of solid matter is visible to the naked eye.

[0084] Add 2000 liters of water to the fine-based Gracilaria gum solution, stir evenly, heat to boil a...

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Abstract

The invention provides a method for extracting agar from gracilaria. The method comprises the following steps: 1) performing alkali treatment: placing and treating gracilaria plants free of impuritiesin an alkali solution, and removing the alkali solution after the treatment is finished; 2) crushing: crushing the gracilaria prepared in step 1) to obtain a crushed feed liquid; 3) heating for extracting agar: supplementing water to the feed liquid obtained in step 2), and performing heating for extracting agar; 4) carrying out deslagging treatment through plate-frame filtration; 5) carrying outdecolorizing treatment by adopting activated carbon; and 6) performing dehydrating and drying to obtain the agar. The gracilaria subjected to alkali treatment is mechanically crushed to form a colloidal solution, the colloidal solution subjected to heating, agar extraction, squeezing and filtration is subjected to decolorizing by using powdered activated carbon, and then undergoes freezing dehydration or squeezing dehydration and drying to obtain the agar product, so the product has a stable yield, a stable quality and a slightly yellow or white appearance. Hydrochloric acid, oxalic acid andthe like are not needed in the whole processing and production process, a chemical bleaching agent is not needed, the water consumption is only about 40% of that of a traditional method, and the generated wastewater amount is also greatly reduced.

Description

technical field [0001] The invention relates to the technical field of light chemical industry, in particular to a method for extracting agar from Gracilaria. Background technique [0002] The production process of extracting agar from Gracilaria generally includes alkali treatment, alkali removal cleaning, acidification treatment, bleaching, acid removal and bleach cleaning, gel extraction by heating, freezing dehydration or pressing dehydration and other main processes. For example, the Chinese patent with the publication number CN106496364A discloses a water-saving method for the production process of extracting agar from Gracilaria, the whole production process contains more chemical treatment procedures, and uses a relatively large amount of acid, alkali and bleaching agent And other chemical materials, each processing 1 ton of Gracilaria requires 150 to 200 tons of water, especially the water consumption of acidification and bleaching processes accounts for the majorit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/12
CPCC08B37/0039C08B37/0003
Inventor 蔡鹰李思东吴湛霞胡章杨磊黄娜张国光梁远维
Owner GUANGDONG OCEAN UNIVERSITY
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