Method of purifying immersed liquid in extraction process of algin, iodine and mannitol

A technology of soaking liquid and alginate, applied in chemical instruments and methods, inorganic chemistry, organic chemistry and other directions, can solve the problems of energy consumption, waste of resources, affecting product yield and production cost, etc., to avoid refining consumption and reduce labor. Strength, clear and transparent water quality

Inactive Publication Date: 2007-10-24
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the composition of kelp soaking liquid is complex. In addition to high-concentration inorganic electrolytes, there are still a large amount of organic matter and colloids such as fucoidan, alginate, kelp starch, amino acids, pigments, and tannins. These impurities are collectively referred to as "sugar gum", and the existence of a large amount of "sugar gum" brings great trouble and difficulty to the process of extracting iodine and purifying mannitol, seriously affecting the product yield and production cost
The traditional water recrystallization method can only be removed by repeated centrifugation and water washing to remove the "sugar gum". However, in the later improved method, the amount of acid and alkali used is large, the treatment effect is poor, and the pollution index FI value of the treated kelp soaking liquid is It is very large and contains a lot of salt, which brings great difficulties to the later desalination and extraction of mannitol, which consumes a lot of energy and wastes resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) Add tap water to kelp and soak for 4 hours, repeat 3 times, and combine each soaking solution, wherein: the amount of tap water added is twice the mass of kelp.

[0017] 2) Get 150mL of combined soaking solution, add 4mL of 1% chitosan hydrochloric acid solution therein, stir the soaking solution for 2 minutes, and flocculate for 15 minutes, wherein white large flocculent aggregates appear in the soaking solution immediately when stirring, and the aggregates It sinks to the bottom, and the supernatant is clear and transparent.

[0018] Wherein: the chitosan acid solution is prepared by hydrochloric acid with a concentration of 1%.

[0019] 3) Use the Buchner funnel to filter the soaking liquid, recover and extract the alginate from the flocs; wherein: put a non-woven fabric of a suitable size in the Buchner funnel, evenly spread the diatomaceous earth on the non-woven fabric, Spread a non-woven fabric of suitable size on top of the soil.

[0020] The concentration ...

Embodiment 2

[0022] 1) Add tap water to the kelp and soak for 6 hours, repeat 3 times, and combine each soaking solution, wherein: the amount of tap water added is 3 times the mass of kelp.

[0023] 2) Get 150mL of combined soaking solution, add 3mL 2% chitosan acetic acid solution therein, stir the soaking solution for 3 minutes, and flocculate for 4 hours, wherein white large flocculent aggregates appear in the soaking solution immediately when stirring, and the aggregates It sinks to the bottom, and the supernatant is clear and transparent.

[0024] Wherein: the chitosan acid solution is prepared with 1% acetic acid.

[0025] 3) The soaking liquid is centrifuged at a speed of 1000 rpm, and the flocs are recovered to extract alginate.

[0026] The concentration of mannitol in the filtered kelp soaking liquid was determined to be 2.5%, which increased the yield of mannitol by 35%.

Embodiment 3

[0028] 1) Add tap water to the kelp and soak for 7 hours, repeat twice, and combine the soaking solutions each time, wherein: the amount of tap water added is 4 times the mass of kelp.

[0029] 2) Take 150 mL of combined soaking solution, add 2 mL of 3% carboxymethyl chitosan acetic acid solution to it, stir the soaking solution for 4 minutes, and flocculate for 8 hours, wherein white large flocculent aggregates appear in the soaking solution immediately when stirring , the aggregates sink to the bottom, and the supernatant is clear and transparent.

[0030] Wherein: the carboxymethyl chitosan acid solution is prepared with 2% acetic acid.

[0031] 3) Use a Buchner funnel to filter the soaking liquid, recover the flocs and extract the alginate; wherein: put a non-woven fabric of a suitable size in the Buchner funnel, spread diatomaceous earth evenly on the non-woven fabric, Spread a non-woven fabric of suitable size on top of the soil.

[0032] The concentration of mannitol ...

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PUM

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Abstract

The invention discloses a new purifying method of immersing liquid in the extracting course of algin, iodine and mannitol, which is characterized by the following: adopting tap water to soak sea-tangle for many times; merging the soaking liquid; adding flocculant; removing carbohydrate gum; making the mannitol density in the soaked liquid of sea-tangle to 1. 9-2. 5%.

Description

technical field [0001] The invention relates to the technical field of marine chemical engineering, in particular to a method for purifying soaking liquid in the process of extracting alginate, iodine and mannitol by using kelp as a raw material. Background technique [0002] At the end of the 1950s, due to the development of the artificial cultivation of kelp, the output of kelp increased sharply. In addition to being used for food, it provided high-quality raw materials for the industrial production of alginate, iodine and mannitol. In the seaweed industry, alginate is mainly extracted from kelp algae residue, and iodine and mannitol are extracted from kelp soaking liquid. Among them, extracting mannitol from kelp soaking liquid is one of the traditional advantages of my country's seaweed industry. It occupies an important position in the marine economy of coastal provinces and cities in my country. However, the composition of kelp soaking liquid is complex. In addition t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/26C01B7/16C08B37/00
Inventor 李鹏程宋金明邢荣娥陈晓琳李智恩
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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