SU1351565A1 - Method of producing salts of alginic acid - Google Patents

Description

extract acid is isolated by adding 10% hydrochloric acid solution.

11351565

The invention relates to the food industry and can be used in the production of sodium and calcium alginates for food and medicine to a pH of 1-1.5, which is industrial. The alginic acid that is released

The purpose of the invention is to improve the quality of alginic acid salts and reduce the consumption of fresh water.

The goal is achieved by the fact that soaking of air-dried brown algae, washing, preparing solutions of formalin and hydrochloric acid, as well as washing from acid are carried out using seawater.

filtered from sour washed with fresh water shower with a temperature of 92-96 C to p

After prepressing, the alga lot is mixed with carbonate at the rate of 1.8% by weight of the floor of alginic acid. When thoroughly mixed, sodium alginate is re-emitted, the swarm is determined by the pH 7, the sodium alginate is rolled into a sub-drier, in installations with a layer on inert bodies and

and water extraction is carried out in fresh water at 70-90 С

In addition, during the precipitation of alginate calcium, a solution of calcium chloride prepared in seawater is added to the purified extract, and after the precipitation of calcium alginate it is washed with seawater.

The method is carried out as follows.

Air-dried brown algae are soaked in seawater, with l, k, 1:10 to swell for 8-10 hours. Then, the thalli are washed in seawater and the petioles and rhizoids are trimmed. Next, the thalli are crushed into strips 3-5 mm wide and poured with 1% formalin solution prepared in sea water at a temperature of 1:15 (based on the weight of air-dried algae) and kept for at least 24 hours. After that, the formalin solution is drained and the algae are poured with a 0.8% solution of hydrochloric acid, prepared on sea water while well-worn. 1:15, incubated in this solution for 2-2.5 hours at ambient temperatures. Then the algae are washed for 30 minutes with sea water with occasional stirring. Washing is completed when there is no reaction to the acid (by litmus) o

The algae prepared for extraction are placed in a varilik, filled with fresh water at a railroad station. 1:30 and contribute 10% sodium carbonate in the mass of air of dry algae to a pH of 8-9. Extraction is carried out at 70-90 ° C for 2 hours with occasional stirring. Then fresh water with a temperature of 70-90 ° C is added. the masses in the varice sheet 1:60. The extract is separated from the algae by twofold filtration. Alginic acid is isolated from the purified extract by adding a 10% hydrochloric acid solution.

to a pH of 1-1.5, Alginate released

to a pH of 1-1.5, Alginate released

acid

filtered from the acidic solution, washed with fresh water by spraying with a temperature of 92-96 ° C to pH 4,

After pressing, alginic acid is mixed with sodium carbonate at the rate of 1.8% by weight of the alginic acid obtained. With thorough mixing, sodium alginate is reacted, the end of which is determined by pH 7, -27.4, Sodium alginate is dried in a freeze dryer, in boiling-bed installations on inert bodies, etc.

Upon receipt of calcium alginate, the operation of its separation from the purified after cooking extract is achieved by adding a 10% solution of calcium chloride prepared in sea water to the extract. The operation of washing the precipitated calcium alginate is also carried out

The use of seawater as a reagent in the technology of obtaining salts of alginic acid in the processes of pre-extraction treatment of algae makes it possible to reduce the amount of -.

the treatment of mineral substances, the content of which when using fresh water is reduced by 15–25%, and also allows preserving water-soluble salts of sodium, calcium,

mannitol. In seawater, which is an algae habitat, these losses are insignificant. This permits the preservation of soluble salts in algae and is the basis for increasing the yield and improving the quality indicators of alginic acid salts while at the same time saving fresh water by an average of 50%. In addition, the use of marine

water in pre-extraction operations, especially when processing a solution of hydrochloric acid in sea water, increases the ion concentration in algae tissues to an equilibrium state,

Therefore, in the extraction of alginate. From the algae treated in this way, a higher quality product can be obtained while reducing the consumption of fresh water.

In addition, nocyie algae treatments in seawater become more stringent and their swelling decreases. In this connection, the concentration of hydrochloric acid is increased from 0.5 to 0.8% in the pretreatment process. The best condition for cooking algae is to increase the extraction temperature to an optimum 85 ° C.

An increase in the yield and quality indicators of sodium alginate is also achieved due to the most complete extraction of alginic acid.

0

at an extraction temperature of 70-90 ° C,

Extraction of alginic acid from algae is produced by fresh water with the addition of sodium carbonate. As a result, the soluble salt of alginic acid is sodium alginate, sodium alginate dissolves well in water, therefore it cannot be washed, calcium alginate is insoluble in

The quality indicators of alginates are the viscosity of a 0.2% aqueous solution of sodium alginate and the molecular weight, t, e, of viscosity 0.2 of sodium alginate dissolved in 0.2 N sodium chlorite.

Example 1, Recycle 2000 g of air-dried algae. Soaked for 8-10 h in seawater at j, k, 1:10, then washed in brine (g, k, 1:10), crushed, poured at j, k, 1:15 with 1% solution formalin, cooked in sea water, and kept in

24 hours for this solution. Then the formalin solution is drained, and the algae are poured at a well, 1:15 with a 0.8% hydrochloric acid solution, also prepared in seawater, and stirred for 2-2.5 hours. Next, the acidic solution is drained, and the algae are washed with cold sea water (f, c, 1:10) with infusion for 30 minutes and water change until no reaction to the acid (by litmus). Prepared for extraction, the algae are poured with fresh water at the well. 1:30, sodium carbonate is added at the rate of 10% by weight of the air-dried alga (pH 8-9) and extracted (cooked) at 85 ° C for 2 hours. Then heated water is added to j. 1:60 and continue extraction without heating for 6-8 hours.

The extract obtained is filtered. Alginic acid is separated from the filtrate by adding 10% hydrochloric acid solution. Next, the alginic acid is separated on the vibrating screen from the acidic solution, washed with fresh water with a temperature of 92–96 ° C to pH 4, and the alginic acid is pressed into, mixed with sodium carbonate at a rate of 1.8% by weight of the alginic acid obtained.

The sodium alginate is then dried in a freeze dryer, crushed and packaged.

Example 2, 2000 g of air-dried algae are processed to produce calcium alginate. Pre-treatment operations. algae (padlock, treatment with formalin solutions, hydrochloric acid, acid washing) are carried out under the conditions of example 1 using sea water. The extraction of algae is carried out analogously to example 1, in two stages at 85 ° C,

Calcium alginate was obtained from the obtained extract by adding to it a 10% solution of calcium chloride prepared in seawater. Then the calcium alginate is washed with sea water from an excess of calcium chloride, pressed, dried also under the conditions of example 1 o

Example 3, 2000 g of air-dried algae are processed into sodium alginate. All operations of the method, except extraction, are carried out under the conditions of Example 1. Extraction is carried out at.

Example 4, Processing 2000 g of air-dried algae for sodium alginate. All operations, except extraction, are carried out under the conditions: x of Example 1, Extraction is carried out at

Etc. and me 5, Recycle 2000 g of air-dried algae to sodium alginate. All operations, extraction chrome, are carried out under the conditions of Example 1, Extraction is carried out at 100

Example 6, 2000 g of air-dried algae are processed into sodium alginate. All operations of the method, except extraction, are carried out under the conditions of Example 1, Extraction is carried out at.

Data on the quality characteristics of alginates and freshwater consumption are tabulated.

The proposed method makes it possible to place plants for the development of alginates at the floating bases near the growing areas of the algal plant used, as well as on the coast of the Far East, where there is a large deficit of fresh water,

Claims (1)

Invention Formula -d The method of obtaining alginic acid salts from air-dried brown algae, including soaking, washing, grinding, processing with formalin solution, draining the tread, treating with hydrochloric acid solution, washing with acid, water All operations are performed on fresh water. Editor M.Kelemes Compiled by N. Pervushina Tehred M. Khodanych Order 5509/2 Circulation 530 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 ten 51565. - °. extraction with the addition of sodium carbonate, purification of the extract, precipitation from the last salts of alginic acid and their drying, characterized in that, in order to improve the quality of alginic acid salts and reduce the consumption of fresh water, soak, wash algae, prepare formalin solutions and hydrochloric acid, as well as for washing from the acid using sea water, and the aqueous extraction is carried out at 70-90 C. 2, the method according to claim 1, characterized in that, during the precipitation of calcium alginate, a solution of chloride is added to the purified extract. calcium prepared in seawater, and after precipitating calcium alginate, it is washed with seawater, Corrector G "Reshetnik"