Description of the latest sodium alginate production process in 2017

Sodium alginate is derived frombrown algagenerickelporsea grapeMiddle extractioniodineandmannitolSubsequentby-productIts molecule consists of β -D- mannuronic acid (β -D-mannuronic, m) and α -L- guluronic acid (α -l -L-guluronic, g) press (1→ 4) key connection. The aqueous solution of sodium alginate has high viscosity and has been used as food.Thickener、stabilizing agent、emulgatorWait. Sodium alginate is a non-toxic food, which was included in the United States Pharmacopoeia as early as 1938. Sodium alginate contains a lot of — COO－-,which can show polyanionic behavior in aqueous solution and has certain adhesion, can be used as a drug carrier for treating mucosal tissue. Under acidic conditions, — COO－-into — COOH，ionization degreeWhen decreasing, the hydrophilicity of sodium alginate decreases, the molecular chain shrinks and the pH value increases, — COOH group dissociates constantly, and the hydrophilicity of sodium alginate increases and the molecular chain stretches. Therefore, sodium alginate has obvious pH sensitivity. Sodium alginate can quickly form gel under extremely mild conditions, when Ca2+, Sr2+ and so on are present.cationWhen it exists, Na+ on G units reacts with divalent cations, and G units pile up to form cross-linked network structure, thus forming hydrogel. Sodium alginate formationgelMild conditions, which can avoid sensitive drugs, protein,cellandenzymeInactivation of such active substances. Because of these excellent characteristics, sodium alginate has been widely used in food industry and medicine.
　

　 1. Kelp digestion:

　

　 　After the kelp is weighed, it is soaked in water 5 times the weight of dry kelp for 20 hours, drained, soaked in tap water and liquid alkali for 3 hours, and the wet kelp soaked for five times is sent to a pulverizer to be crushed to 2-3mm, washed with water, dewatered in a cage and sent to a digester; Add 1% hot alkaline water (sodium carbonate) at 80℃ to kelp in a digester, stir well, then let it stand for two hours, perform primary pulping, digest for another hour, perform secondary pulping, digest for another 0.5 hour, perform tertiary pulping, and then put it into a dilution pool.

　

　 2. Dilution and filtration:

　

　 　Dilute to Engel's for 100-120 seconds, mix with compressed air, send it to a foaming machine for foaming and settling for 2.5-3 hours, then take the supernatant and send it to a 300-mesh crawler filter for filtration, and send the filtrate to a calcification system with a water pump for calcification.

　

　 3. Calcification and dehydration:

　

　 　Adding 1% calcium solution (the concentration of calcium chloride in calcium solution is 10%), adding chlorine for bleaching, foaming with a foaming device and stirring at high speed, entering an aging tank, then entering a decalcifying barrel, stirring and adding 5% hydrochloric acid for decalcification, then entering a cage for dehydration, and squeezing and dewatering after decalcification for three times to generate alginic acid.

　　

　 4. Liquid phase transformation:

　

Alginate is sent to a liquid phase converter, and 75% ethanol solution is added, and liquid sodium hydroxide is added to neutralize it to pH 9, and then centrifugal dehydration (distillation and recovery of waste ethanol solution) is carried out to generate sodium alginate.

　

　 　5. Granulating and drying:

　

After the centrifugal sodium alginate is granulated, it is sent to a dryer for drying until the water content is 16%-17%, and then it is crushed into 40 meshes in a mill. After passing the inspection, it is packaged and delivered from the factory.

　

　 　Sodium alginate is widely used in food, medicine, textile, printing and dyeing, papermaking, daily chemicals and other products, as thickener, emulsifier, stabilizer, adhesive, sizing agent and so on.

　　

　 　Since 1980s, the application of sodium alginate in food has been expanded. Sodium alginate is not only a food additive, but also a substrate of bionic food or functional food. Because it is actually a natural cellulose, it can slow down the absorption of fatty sugar and bile salt, reduce serum cholesterol, blood triglyceride and blood sugar, and prevent three kinds of modern diseases.

　

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