| CPC C08B 37/0084 (2013.01) | 4 Claims |
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1. A composition comprising sodium alginate, resulting from a method, comprising:
soaking raw algae in a solution comprising purified water, 0.1-10% sodium chloride, and 0.1-5% aqueous formaldehyde for 1 to 30 days,
washing said raw algae with clean water,
crushing said raw algae to a size not greater than 10 cm,
boiling said raw algae under a pressure of 1-1.5 atm and at a temperature of 100-110° C., for 0.5-12 hours, in an aqueous solution of 0.5-10% sodium hydrocarbonate, the ratio of the raw algae to the aqueous solution ranging between 1:1 and 1:20,
mixing said raw algae with water to form a diluted algae mass having an algae-to-water ratio of 1:20-1:300 and stirring said raw algae with water for 1-10 hours at 20-60° C.,
purifying said diluted algae mass to form a purified solution,
adding sulfuric acid to said purified solution, while being mechanically stirred, to achieve a pH of 1.5-4.0, thereby precipitating alginic acid,
collecting and washing said alginic acid with purified water to a pH of 4.0-5.5,
dehydrating said alginic acid,
mixing sodium hydrogen carbonate with said alginic acid to achieve a mixture pH of 5.0-7.5, and stirring said mixture to form a homogeneous sodium alginate gel,
adding sodium hypochlorite to the homogenous sodium alginate gel, and actively stirring until an active chlorine content reaches 0.2-6.0 g/l,
adding ethyl alcohol (50-95% vol.) to said homogeneous sodium alginate gel to precipitate a fibrous mass of sodium alginate, washing said fibrous mass of sodium alginate, and pressing said fibrous mass, and
drying said fibrous mass of sodium alginate.
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