Method of industrial extraction of alginates from brown seaweed of the family sargassaceae of the order fucales

A method for producing alginate, 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.