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Method for electrochemically cleaning alkaline gracilaria

An electrochemical and Gracilaria technology, applied in the field of agar green production, can solve problems such as large water consumption

Pending Publication Date: 2021-11-05
JIMEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, the present invention proposes a kind of method of electrochemical oxidation cleaning alkaline Gracilaria, this method carries out electrolysis to the Gracilaria after alkali treatment by electrochemical oxidation, can reach the purpose of washing out the lye in Gracilaria quickly, and Provide new ideas for solving the problem of how to reduce the large consumption of subsequent cleaning water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The plate area is 3990mm 2 , the distance between the plates is set to 12cm, and the voltage is set to 5V:

[0023] (1) Alkali treatment: the pretreated dried Gracilaria was mixed at a ratio of 1:15 (g / cm 3 ) to a solid-to-liquid ratio by adding 7% NaOH, placing it in a water bath at 85° C. for 3 hours, and filtering the lye to obtain alkaline Gracilaria.

[0024] (2) Electrolysis: press 10:1 (g / cm2) in the electrolyzer 3 ) solid-to-liquid ratio, add water and filter the obtained alkaline Gracilaria, set the voltage of 5v, place the anode and cathode at 3990mm 2 The ruthenium-iridium-titanium plate is set at a distance of 12 cm, and the electrolysis is performed by connecting a DC power supply with a wire, and the electrolyte is taken at 0 min, 20 min, 40 min, 60 min, 80 min, 100 min and 120 min electrolysis time.

[0025] In this embodiment, the pH of the electrolyte was the lowest at 0 min, which was 12.84, and the highest at 120 min, which was 13.03; the conductiv...

Embodiment 2

[0027] The plate area is 8190mm 2 , the distance between the plates is set to 12cm, and the voltage is set to 5V:

[0028] (1) Alkali treatment: the pretreated dried Gracilaria was mixed at a ratio of 1:15 (g / cm 3 ) to a solid-to-liquid ratio by adding 7% NaOH, placing it in a water bath at 85° C. for 3 hours, and filtering the lye to obtain alkaline Gracilaria.

[0029] (2) Electrolysis: press 10:1 (g / cm2) in the electrolyzer 3 ) to the solid-to-liquid ratio, add water and filter the alkaline Gracilaria, set the 5v voltage, place the anode and cathode at 8190mm 2 The ruthenium-iridium-titanium plate is set at a distance of 12 cm, and the electrolysis is performed by connecting a DC power supply with a wire, and the electrolyte is taken at 0 min, 20 min, 40 min, 60 min, 80 min, 100 min and 120 min electrolysis time.

[0030] In this embodiment, the pH of the electrolyte is the lowest at 0 min, which is 12.92, and the highest at 120 min, which is 13.02; the conductivity is t...

Embodiment 3

[0032] The plate area is 3990mm 2 , the distance between the plates is set to 18cm, and the voltage is set to 5V:

[0033] (1) Alkali treatment: the pretreated dried Gracilaria was mixed at a ratio of 1:15 (g / cm 3 ) to a solid-to-liquid ratio by adding 7% NaOH, placing it in a water bath at 85° C. for 3 hours, and filtering the lye to obtain alkaline Gracilaria.

[0034] (2) Electrolysis: press 10:1 (g / cm2) in the electrolyzer 3 ) solid-to-liquid ratio, add water and filter the obtained alkaline Gracilaria, set the voltage of 5v, place the anode and cathode at 3990mm 2 The ruthenium-iridium-titanium plate is set at a distance of 18cm, and the electrolysis is performed by connecting a DC power supply with a wire, and the electrolyte is taken under the electrolysis time of 0min, 20min, 40min, 60min, 80min, 100min and 120min respectively.

[0035] In this example, the pH of the electrolyte was the lowest at 0min, which was 12.96, and the highest at 80min, 100min and 120min, wh...

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Abstract

The invention discloses a method for electrochemically cleaning alkaline gracilaria. The method comprises the following step of adding water and alkaline gracilaria into an electrolytic bath according to a solid-to-liquid ratio of 10: 1, placing ruthenium-iridium-titanium polar plates at a cathode and an anode in the electrolytic bath, setting a distance between the polar plates to be 6-18 cm, and connecting a direct-current power supply by a wire for electrolysis so as to transfer alkali from the gracilaria into the water. According to the method, a low-concentration alkaline gracilaria electrolyte can be rapidly obtained, about 3600 tons of cleaning water is reduced when 1 ton of agar is produced, and a technical basis is provided for green production of the gracilaria agar.

Description

technical field [0001] The invention relates to the technical field of agar green production, in particular to a method for electrochemically cleaning alkaline Gracilaria. Background technique [0002] Agar, also known as agar gum, is a natural polysaccharide mainly extracted from red algae such as Gracilaria and Geliflower. It has gelling and thickening properties and is widely used in food, medicine and biology. At present, 60% of the raw materials for agar production in the world come from Gracilaria. The production process of traditional Gracilaria agar mainly includes alkali treatment, water washing, acidification, bleaching, water washing, gel cooking, dehydration and drying, etc. Among them, alkali treatment can remove the sulfuric acid groups on the agar molecules and enhance the strength of the agar gel. However, it is widely used in the extraction process of Gracilaria agar. According to relevant literature reports, 700 kg of alkali is consumed for every 1 ton of ...

Claims

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Application Information

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IPC IPC(8): C25F1/00
CPCC25F1/00
Inventor 李志朋谢杉玉倪辉梁懿姜泽东朱艳冰杜希萍郑明静李清彪
Owner JIMEI UNIV
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