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Method for extracting alginate and method for recycling waste calcium water

A technology of alginate and extraction method, which is applied in chemical instruments and methods, natural water treatment, water/sewage multi-stage treatment, etc., and can solve the problems of complex waste calcium water recycling technology, incomplete glue purification, and diluting water High unit consumption and other issues, to achieve the effect of improving comprehensive utilization efficiency, improving recycling and economic benefits, and reducing water consumption

Active Publication Date: 2017-05-17
QINGDAO BRIGHT MOON SEAWEED GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of high unit consumption of diluting water in the existing alginate extraction process, incomplete purification of glue solution after diluting, complex recovery and utilization technology of waste calcium water, environmental pollution and high reuse cost, the invention provides a seaweed The extraction method of acid salt and the reuse method of waste calcium water can effectively improve the purity of sodium alginate, and at the same time greatly reduce the unit consumption of alginate process water and recycle the method of waste calcium water, which improves the comprehensive utilization efficiency of resources and reduces the environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Soaking: Accurately weigh 100kg of dried kelp, add 800kg of water to soak for 2 hours, and wash to remove surface impurities;

[0037] (2) Broken: the soaked kelp is chopped into 1×1cm flakes;

[0038] (3) Transformation: add 500kg of water and 15kg of sodium carbonate to the chopped kelp to adjust the water temperature to 40-55°C, and react for 1-1.5h;

[0039] (4) Dilution: Dilute the converted material with water to an Engler viscosity of 250s;

[0040] (5) Centrifugation and floating: After dilution, the glue is centrifuged with a decanter centrifuge to remove water-insoluble impurities, and then left to float for 2.5 hours;

[0041] (6) Oxidation: release the supernatant after standing still, add chlorine gas to the supernatant to make the available chlorine content in the glue solution 30ppm, and let it stand for 30 minutes to react.

[0042] (7) Separation: After the static reaction, use a 200-mesh fine mesh filter to remove impurities in the glue solution ...

Embodiment 2

[0051] (1) Soaking: Accurately weigh 200kg of dried macroalgae, add 1800kg of water to soak for 24 hours, and wash to remove surface impurities;

[0052] (2) Crushing: the soaked macroalgae are chopped into pieces with a diameter of 2 mm;

[0053] (3) Transformation: Add 1000kg of water and 48kg of sodium carbonate to the chopped macroalgae to adjust the water temperature to 50-55°C, and react for 8-10 hours;

[0054] (4) Dilution: Dilute the converted material with water to an Engler viscosity of 300s;

[0055] (5) Centrifugation and floating: After dilution, the glue is centrifuged with a decanter centrifuge to remove water-insoluble impurities, and then left to float for 2 hours;

[0056] (6) Oxidation: After standing still, release the supernatant, and evenly add chlorine dioxide aqueous solution to the supernatant, so that the effective chlorine content in the glue is 40ppm, and let it stand for 30 minutes to react.

[0057] (7) Separation: add diatomaceous earth to the...

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Abstract

The invention discloses a method for extracting alginate and a method for recycling waste calcium water. The method comprises the following steps: 1) rinsing brown alga and then breaking, adding sodium carbonate and water and reacting, thereby acquiring an algin pasty material, and then adding water for diluting the pasty material, thereby acquiring a glue solution A; 2) centrifuging and removing water-insoluble residue from the diluted glue solution A, and then standing by and floating, and removing the supernatant scum, thereby acquiring a clear liquid B; 3) adding an oxidizing agent into the clear liquid B, uniformly stirring and then standing by and reacting, and filtering, thereby acquiring a purified glue solution C; and 4) adding a calcium chloride aqueous solution into the purified glue solution C and reacting, thereby acquiring calcium alginate used for extracting the alginate, and meanwhile, generating the waste calcium water. According to the method disclosed by the invention, the purity of the algin can be effectively increased, the unit consumption of the alginate process water is greatly reduced and the waste calcium water is reutilized, the comprehensive utilization efficiency of the resource is increased and the environmental pollution is reduced.

Description

technical field [0001] The invention belongs to the technical field of alginate preparation, and in particular relates to a method for extracting alginate from brown algae and a method for recycling and utilizing waste calcium water remaining after the alginate is extracted. Background technique [0002] The cell wall of brown algae cells is mainly composed of alginate (mainly calcium alginate), fiber, pectin and protein. In the current production of seaweed, sodium carbonate is added after soaking brown algae for transformation. The disadvantage is: under high temperature and alkaline conditions, the cellulose and protein in brown algae are also easily hydrolyzed, and after hydrolysis, they are converted into water-soluble products and enter the subsequent process. It is not easy to remove, and will eventually react with calcium chloride and precipitate into calcium alginate, affecting the quality of alginate. For example, in the invention patent CN102060938B "A method for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/04C02F9/04C02F103/38
Inventor 徐泽斌窦有涛王超黑雅各
Owner QINGDAO BRIGHT MOON SEAWEED GROUP