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Sodium alginate

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Textile printing grade sodium alginate
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Food grade sodium alginate

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pharmaceutical grade sodium alginate
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potassium alginate

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alginic acid

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mannitol
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Iodine
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Sodium alginate extraction method

Release date:2012-12-9


In kelp as the raw material, extracting sodium alginate methods at home and abroad and mainly adopts the following kinds :

  1. Acid condensing - acidification method
    The raw material kelp soak, remove mechanical impurity, fucoidan, inorganic salt such as water soluble component, then take out kelp, washing, cut into uniform block. At 25 ℃, with less than 0.01 mol/L dilute hydrochloric acid or dilute sulphuric acid treatment. Then add the sodium carbonate, in 55-75 ℃ and mix reaction 1-1.5 h, the polyvalent metal ionic alginate into sodium type. Reaction equations as follows: 2 M (Alg) n + nNa2CO3-2 nnaalg + M2 (CO3) (1) (M for Ca, Fe and metal ions, Alg representative algae glue) ,The raw material digestive juice first filtering, remove the rough grain, filtered feed liquid water dilution, and then went to feed liquid slowly add dilute hydrochloric acid in until the floc has so far, and then standing 8 ~ 12 h, and finally to standing in the liquid slowly add dilute hydrochloric acid, regulate the PH is about 1 ~ 2, alginic acid is condensed into acid clot. Equation are as follows:
    NaAlg + HCI→Halg↓+NaCI (2)  
    2NaAlg + H2SO4→2HAlg↓+Na2SO4 (3)
    Collect acid piece, washing, dehydration, crushing, stir in powdered sodium carbonate. General alkaline content is 8% or so, to mix the mix, then quiet place 4 ~ 6 hours, make its complete conversion process, generate sodium alginate. And after the product moisture content is 65 ~ 75%, pH 6.0 ~ 7.5, this is a solid phase and. Can also be liquid neutralization Alginic acid smashs, dispersion in gel quantity 40% of more than 80% of the alkaline ethanol solution, stir in the mixed reaction to sodium alginate, until the pH 7.5 neutralization is completed, filtration, drying, crushing and then products.
  2. Calcium setting - acidification method
    Raw material processing, soak, digestion, clarification procedure and "acid condensing - acidification method" the same, just behind the solidification process such as the different :Digestive juice filter, in pH 6.0 ~ 7.0 conditions, add quantitative 10% calcium chloride solution, and mix together. Calcium setting get calcium alginate after washing to remove residual inorganic salts, with 10% of the dilute acid acidification 30 minutes, make it into alginate clot. Garnish with sodium carbonate solution through the liquid phase method or solid phase transformation method ChengHaiZao acid sodium, filtration, drying, crushing and then products.
  3. Calcium setting - ion exchange method
    This method of raw materials processing, absorption, digestion, pre neutralization dilution, filtering, calcium and calcium Settings - acidification method "the same process. Calcium Settings, and 10% sodium chloride solution as leacheate, with column chromatography exchange, reaction generated sodium alginate, after drying after crushing, can get product
Lianyungang huanyu seaweed co., LTD. Mainly produces sodium alginate
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