CN113604863A - Method for electrochemically cleaning alkaline gracilaria - Google Patents

Method for electrochemically cleaning alkaline gracilaria Download PDF

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Publication number
CN113604863A
CN113604863A CN202110780651.7A CN202110780651A CN113604863A CN 113604863 A CN113604863 A CN 113604863A CN 202110780651 A CN202110780651 A CN 202110780651A CN 113604863 A CN113604863 A CN 113604863A
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gracilaria
alkaline
water
alkali
polar plates
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CN202110780651.7A
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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
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Jimei University
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Jimei University
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
  • Electrodes For Compound Or Non-Metal Manufacture (AREA)

Abstract

The invention discloses a method for electrochemically cleaning alkaline gracilaria, which comprises the following steps: adding water and alkaline gracilaria into an electrolytic cell according to a solid-to-liquid ratio of 10:1, placing ruthenium-iridium-titanium polar plates on a cathode and an anode in the electrolytic cell, setting the distance between the polar plates to be 6-18 cm, and connecting a direct current power supply with a lead to carry out electrolysis so as to transfer alkali from the gracilaria into water. The invention can quickly obtain the low-concentration alkaline gracilaria electrolyte, and 3600 tons of cleaning water are reduced when 1 ton of agar is produced, thereby providing a technical basis for green production of gracilaria agar.

Description

Method for electrochemically cleaning alkaline gracilaria
Technical Field
The invention relates to the technical field of agar green production, in particular to a method for electrochemically cleaning alkaline gracilaria.
Background
Agar, also called agar, is a natural polysaccharide mainly extracted from red algae such as gracilaria, gelidium amansii and the like, has the performances of gelation, thickening and the like, and is widely applied to the fields of food, medicine, biology and the like. At present, 60 percent of agar production raw materials all over the world are derived from gracilaria. The traditional production process of the gracilaria agar mainly comprises alkali treatment, water washing, acidification, bleaching, water washing, gel boiling, dehydration and drying and the like, wherein the alkali treatment can remove sulfate groups on agar molecules and enhance the strength of the agar gel, so that the process is widely applied to the extraction process of the gracilaria agar, according to related literature reports, 700kg of alkali is consumed for producing 1t of the agar, wherein the alkali absorbed by the gracilaria after the alkali treatment accounts for about 36 percent, so that the water for later-stage cleaning of the alkaline gracilaria is increased, and the difficulty is increased for further treating the cleaned low-concentration alkali liquor and the waste water.
At present, the researches on alkali saving and cleaning water in the production of gracilaria agar mostly focus on the optimization of an alkali treatment process and a cleaning process, and the alkali treatment generally adopts a high-temperature dilute alkali method to replace concentrated alkali. The extraction of agar by an enzyme method is assisted by, for example, the pulsatilla chinensis, and the like, and an agar green production process is developed, but the additional cost of agar is also increased.
Disclosure of Invention
The present invention is directed to solving, to some extent, one of the technical problems in the related art. Therefore, the invention provides a method for cleaning alkaline gracilaria through electrochemical oxidation, which can electrolyze the gracilaria subjected to the alkaline treatment through the electrochemical oxidation, achieve the aim of quickly washing out alkali liquor in the gracilaria, and provide a new idea for solving the problem of large consumption of water for subsequent cleaning.
In order to achieve the above object, the present invention provides a method for electrochemically cleaning Gracilaria alkaline, comprising:
adding water and alkaline gracilaria into an electrolytic cell according to a solid-to-liquid ratio of 10:1, placing ruthenium-iridium-titanium polar plates on a cathode and an anode in the electrolytic cell, setting the distance between the polar plates to be 6-18 cm, and connecting a direct current power supply with a lead to carry out electrolysis so as to transfer alkali from the gracilaria into water.
According to the method for electrochemically cleaning alkaline gracilaria, provided by the embodiment of the invention, the electrochemical oxidation method is used for electrolyzing the gracilaria subjected to alkali treatment, and electrochemical reactions with the same electrochemical equivalent are carried out on the two poles of ruthenium-iridium-titanium cathode and anode, so that the alkali is quickly transferred from the gracilaria to the solution, the purpose of quickly cleaning the alkali liquor in the gracilaria is realized, and a new idea is provided for solving the problem of large water consumption for subsequent cleaning.
In addition, the method for electrochemically cleaning Gracilaria verrucosa according to the above embodiment of the present invention may further have the following additional features:
optionally, the alkaline gracilaria is: adding 6-8% NaOH solution into the dry gracilaria according to the solid-to-liquid ratio of 1: 15-1: 18, placing the mixture in a water bath kettle at 85-90 ℃ for treatment for 2.5-3.5 h, and filtering alkali liquor to obtain the gracilaria.
Optionally, the material of the cell is plexiglass, with dimensions 180mm x 70mm x 100mm (length x width x height).
Optionally, the effective areas of the ruthenium iridium titanium plates are 3990mm respectively2(specification of 100mm 21mm +63mm 30mm, thickness 1mm) -8190 mm2(specification 130mm 63mm, thickness 1 mm).
Optionally, the voltage set by electrolysis is 3V to 11V.
Optionally, the distance between the electrode plates in the electrolytic cell is 6 cm-18 cm.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Detailed Description
The technical solution of the present invention is illustrated by specific examples below. It is to be understood that one or more method steps mentioned in the present invention do not exclude the presence of other method steps before or after the combination step or that other method steps may be inserted between the explicitly mentioned steps; it should also be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Moreover, unless otherwise indicated, the numbering of the various method steps is merely a convenient tool for identifying the various method steps, and is not intended to limit the order in which the method steps are arranged or the scope of the invention in which the invention may be practiced, and changes or modifications in the relative relationship may be made without substantially changing the technical content.
In order to better understand the above technical solutions, exemplary embodiments of the present invention are described in more detail below. While exemplary embodiments of the invention have been shown, it should be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The test materials adopted by the invention are all common commercial products and can be purchased in the market.
Wherein, the property test of the electrolyte adopts:
the change in pH of the lye was measured by means of a pH meter.
The invention will now be described with reference to specific examples, which are intended to be illustrative only and not to be limiting in any way.
Example 1
The area of the polar plate is 3990mm2The distance between the polar plates is 12cm, and the voltage is 5V:
(1) alkali treatment: the pretreated dry gracilaria verrucosa is processed according to the ratio of 1:15 (g/cm)3) Adding 7% NaOH, treating in 85 deg.C water bath for 3 hr, and filtering the alkali solution to obtain alkaline Gracilaria.
(2) Electrolysis: in an electrolytic cell according to the ratio of 10:1 (g/cm)3) Adding water and alkaline Gracilaria verrucosa obtained by filtering into the solid-to-liquid ratio of the sodium alginate, setting voltage of 5v, and placing cathode and anode at 3990mm2The distance between the ruthenium iridium titanium polar plates is 12cm, the ruthenium iridium titanium polar plates are connected with a direct current power supply by leads for electrolysis, and electrolyte is obtained under the electrolysis time of 0min, 20min, 40min, 60min, 80min, 100min and 120min respectively.
In the embodiment, the pH of the electrolyte is 12.84 at the lowest time of 0min and 13.03 at the highest time of 120 min; the conductivity is 18.23ms cm at the lowest at 0min-1The highest value in 100min is 23.50ms cm-1。
Example 2
The area of the polar plate adopts 8190mm2The distance between the polar plates is 12cm, and the voltage is 5V:
(1) alkali treatment: the pretreated dry gracilaria verrucosa is processed according to the ratio of 1:15 (g/cm)3) Adding 7% NaOH, treating in 85 deg.C water bath for 3 hr, and filtering the alkali solution to obtain alkaline Gracilaria.
(2) Electrolysis: in an electrolytic cell according to the ratio of 10:1 (g/cm)3) Adding water and alkaline Gracilaria verrucosa obtained by filtering into the solid-to-liquid ratio, setting voltage of 5v, and placing the cathode and anode at 8190mm2The distance between the ruthenium iridium titanium polar plates is 12cm, the ruthenium iridium titanium polar plates are connected with a direct current power supply by leads for electrolysis, and electrolyte is obtained under the electrolysis time of 0min, 20min, 40min, 60min, 80min, 100min and 120min respectively.
In the embodiment, the pH of the electrolyte is 12.92 at the lowest in 0min and 13.02 at the highest in 120 min; the conductivity is 17.53ms cm at the lowest at 0min-1The highest value among 120min is 22.03ms cm-1。
Example 3
The area of the polar plate is 3990mm2The distance between the polar plates is 18cm, and the voltage is 5V:
(1) alkali treatment: the pretreated dry gracilaria verrucosa is processed according to the ratio of 1:15 (g/cm)3) Adding 7% NaOH, treating in 85 deg.C water bath for 3 hr, and filtering the alkali solution to obtain alkaline Gracilaria.
(2) Electrolysis: in an electrolytic cell according to the ratio of 10:1 (g/cm)3) Adding water and alkaline Gracilaria verrucosa obtained by filtering into the solid-to-liquid ratio of the sodium alginate, setting voltage of 5v, and placing cathode and anode at 3990mm2The distance between the ruthenium iridium titanium polar plates is set to be 18cm, the ruthenium iridium titanium polar plates are connected with a direct current power supply by leads for electrolysis, and electrolyte is obtained under the electrolysis time of 0min, 20min, 40min, 60min, 80min, 100min and 120min respectively.
In the embodiment, the pH of the electrolyte is 12.96 at the lowest in 0min and 12.98 at the highest in 80min, 100min and 120 min; the conductivity is 18.23ms cm at the lowest at 0min-1The highest value at 60min is 23.07ms cm-1。
Example 4
The area of the polar plate is 3990mm2The distance between the polar plates is 12cm, and the voltage is 11V:
(1) alkali treatment: the pretreated dry gracilaria verrucosa is processed according to the ratio of 1:15 (g/cm)3) Adding 7% NaOH, treating in 85 deg.C water bath for 3 hr, and filtering the alkali solution to obtain alkaline Gracilaria.
(2) Electrolysis: in an electrolytic cell according to the ratio of 10:1 (g/cm)3) Adding water and alkaline Gracilaria verrucosa obtained by filtering into the solid-to-liquid ratio of the obtained solution, setting voltage of 11v, and placing anode and cathode at 39990mm2The distance between the ruthenium iridium titanium polar plates is 12cm, the ruthenium iridium titanium polar plates are connected with a direct current power supply by leads for electrolysis, and electrolyte is obtained under the electrolysis time of 0min, 20min, 40min, 60min, 80min, 100min and 120min respectively.
In this example, the pH of the electrolyte was 12.85 at the lowest pH of 0min and 12.93 at the highest pH of 20 min; the conductivity is 18.98ms cm at the lowest at 0min-1The highest value at 80min is 23.40ms cm-1。
Comparative example
Standing:
(1) alkali treatment: the pretreated dry gracilaria verrucosa is processed according to the ratio of 1:15 (g/cm)3) Adding 7% NaOH, treating in 85 deg.C water bath for 3 hr, and filtering the alkali solution to obtain alkaline Gracilaria.
(2) Standing: in an electrolytic cell according to the ratio of 10:1 (g/cm)3) Adding water and the filtered alkaline gracilaria at the solid-to-liquid ratio, and taking out the dissolved dilute alkali solution within 0min, 20min, 40min, 60min, 80min, 100min and 120min respectively.
In this example, the pH of the diluted alkaline solution is 12.85 at the lowest pH value of 0min and 12.97 at the highest pH value of 60 min; the conductivity is 17.89ms cm at the lowest at 0min-1The maximum value is 21.30ms cm at 60min-1。
To sum up, combining the above examples 1-4 and comparative example, when the plate area is 3990mm2The distance between the polar plates is 12cm, the voltage is 5V, the pH value of the electrolyte after electrolysis is more than 13.00 within 0-120 min, and is higher than the pH value of alkali solution dissolved out from standing Gracilaria verrucosa, and the conductivity under the electrolysis condition is higher than the conductivity of alkali solution dissolved out from standing Gracilaria verrucosaThe conductivity of the solution is generally higher, and the concentration and conductivity of the alkali solution dissolved out by the gracilaria subjected to standing alkali treatment are reduced along with the prolonging of time, which is probably the result of the absorption of the dissolved alkali in the solution by the gracilaria.
According to the method for electrochemically cleaning alkaline Gracilaria, provided by the embodiment of the invention, the Gracilaria subjected to the alkali treatment is electrolyzed through electrochemical oxidation, the alkali absorbed into the Gracilaria after the alkali treatment is quickly electrolyzed into the solution, so that the purpose of quickly washing the alkali liquor in the Gracilaria is achieved, 3600 tons of water for subsequent cleaning is reduced every 1 ton of agar is produced, water resources are saved, and green production of Gracilaria agar is realized.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above should not be understood to necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (6)

1. A method for electrochemically cleaning Gracilaria verrucosa comprises the following steps:
adding water and alkaline gracilaria into an electrolytic cell according to a solid-to-liquid ratio of 10:1, placing ruthenium-iridium-titanium polar plates on a cathode and an anode in the electrolytic cell, setting the distance between the polar plates to be 6-18 cm, and connecting a direct current power supply with a lead to carry out electrolysis so as to transfer alkali from the gracilaria into water.
2. The method of claim 1, wherein said Gracilaria alkaligenes is: adding 6-8% NaOH solution into the dry gracilaria according to the solid-to-liquid ratio of 1: 15-1: 18, placing the mixture in a water bath kettle at 85-90 ℃ for treatment for 2.5-3.5 h, and filtering alkali liquor to obtain the gracilaria.
3. The method of claim 1, wherein the material of the cell is plexiglass, having dimensions of 180mm by 70mm by 100 mm.
4. The method of claim 1, wherein the ruthenium iridium titanium plates each have an effective area of 3990mm2～8190mm2。
5. The method of claim 1, wherein the voltage set for electrolysis is between 3V and 11V.
6. The method of claim 1, wherein the distance between the plates in the cell is between 6cm and 18 cm.
CN202110780651.7A 2021-07-09 2021-07-09 Method for electrochemically cleaning alkaline gracilaria Pending CN113604863A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110407956A (en) * 2019-08-09 2019-11-05 华南理工大学 A kind of low-temperature instant agar and preparation method thereof
CN111206257A (en) * 2020-01-09 2020-05-29 中南大学 Alkaline waste residue dealkalization method based on electrochemistry

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110407956A (en) * 2019-08-09 2019-11-05 华南理工大学 A kind of low-temperature instant agar and preparation method thereof
CN111206257A (en) * 2020-01-09 2020-05-29 中南大学 Alkaline waste residue dealkalization method based on electrochemistry

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