Method for coproduction of sodium alginate, mannitol and iodine by enzymolysis approach

A technology of sodium alginate and mannitol, applied in the separation/purification of iodine, iodine/hydrogen iodide, hydroxyl compounds, etc., can solve the problem of low profit or loss of kelp processing enterprises, large water consumption and high production cost of kelp processing technology It can achieve the effect of reducing consumption and sewage discharge, reducing energy consumption and reducing production costs.

Inactive Publication Date: 2013-07-10
QINGDAO BETTER BIO TECH
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  • Summary
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AI Technical Summary

Problems solved by technology

[0006] Our country is rich in kelp resources, and using kelp as raw materials to produce deep-processed products such as sodium alginate, iodine and mannitol is the main way for comprehensive utilization of kelp. In recent years, due to the influence of chemical synthesis and other methods, the market competition is

Method used

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Examples

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Effect test

Embodiment 1

[0016] Cut 0g of kelp into pieces, then add 370mL of fresh drinking water, soak for 8 hours, then use a beater to homogenize the kelp, put it in a 55°C water solution for heating, directly add 0.05% of the weight of kelp compound protease, 55°C enzyme Decompose for 2 hours, stirring continuously during the enzymolysis process; after the end of the enzymolysis, raise the temperature to 90°C and keep for 10-20min to inactivate the enzyme, and then centrifuge to obtain the enzymolysis pretreatment solution A; use an equal volume of fresh drinking water for the kelp residue Wash twice, and the cleaning solution is combined and reserved for soaking in the next batch to obtain pretreated kelp.

[0017] The enzymatic hydrolysis pretreatment liquid A is pre-adjusted to a pH of 9.0, and the seaweed polysaccharides in it are flocculated and precipitated, and filtered; the clear liquid is adjusted to a pH of 2 with 5M HCl, and then 0.1% NaClO is added 3 , the iodine in it is converted in...

Embodiment 2

[0022] Take 1000kg of kelp, crush it, adjust the solid-liquid ratio to 1:7 with fresh drinking water, soak it at room temperature for 3 hours, and then use a beater to beat it; then put it in a water bath at 55°C and add 0.05% protease to continue enzymatic hydrolysis for 3 hours. Stir continuously during the enzymolysis process. After the enzymolysis is over, raise the temperature to 80°C and keep for 15 minutes to inactivate the enzyme; then, centrifuge to obtain the enzymolysis pretreatment solution: wash the kelp residue twice with an equal volume of fresh drinking water, wash The liquid is combined and reserved for soaking in the next batch.

[0023] The extraction of iodine is: the enzymatic hydrolysis pretreatment solution is adjusted to pH 9 with an appropriate amount of lime water, and the seaweed polysaccharides are flocculated and precipitated, filtered; the clear liquid is adjusted to pH 2 with 5M HCl, and then 0.2% NaClO 3 , so that the iodine in it is converted ...

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Abstract

The invention discloses a method for coproduction of sodium alginate, mannitol and iodine by enzymolysis approach. The method comprises the following steps of: taking brown seaweeds as the raw material, pretreating the raw material by a bio-enzymolysis approach, extracting iodine and mannitol from pretreated liquid, removing partial protein and the water soluble component seaweed residues for extraction and separation of sodium alginate, and finally, obtaining high-quality sodium alginate through a dilute alkali digestion process and by calcium solidification-ion exchange method. The method is characterized in that the seaweeds are pretreated by a biological enzyme, so that water soluble matters such as protein and the like therein are dissolved out in advance, which is advantageous for the subsequent extraction process of sodium alginate and the quality of the product and also for improving the product extraction ratio, and in such a way, the recycling of production water is realized finally; the process of extracting iodine and mannitol in the pretreated liquid is simple, and the production cost and the energy consumption are reduced; and compared with the existing industrial production process, more than 90% of water is saved, and the consumption of water resource and sewage drainage are greatly reduced so that environmental pollution is reduced.

Description

technical field [0001] The invention relates to a method for producing sodium alginate and co-producing mannitol and iodine by enzymatic hydrolysis, belonging to the field of comprehensive utilization of seaweed. Background technique [0002] Kelp is one of the seaweeds with high economic value. In addition to containing fat, vitamins, nitrogen compounds, calcium, iron and other inorganic salts, it is especially rich in organic iodine, mannitol and sodium alginate. The content of sodium alginate in dried kelp is as high as 24%; the iodine content is as high as 240-270mg / kg, and more than 80% is organic active iodine that can be directly absorbed by the human body; and the content of mannitol is as high as 17%. [0003] As a natural polymer, sodium alginate is widely used in chemical, Biology, medicine, food and other fields. The output of sodium alginate in my country accounts for 40% of the world's total output, ranking first in the world. [0004] Iodine is the basic ra...

Claims

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Application Information

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IPC IPC(8): C08B37/04C01B7/14C07C31/26C07C29/76
Inventor 任宪君张秋艳曹荣军杨庆利武鑫
Owner QINGDAO BETTER BIO TECH
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