Modified sorbent preparation process

FIELD: sorbents.

SUBSTANCE: invention concerns modified sorbents applicable in food-processing and chemical industries. Modified sorbent is prepared from aluminum-containing raw material, namely from aluminum band etching waste in manufacture of aluminum structures. Fifty gram of raw material is treated for 3-5 h at 70°C with 3-7% sodium hydroxide solution in amounts 100. 125 or 150 cc. Resulting precipitate is filtered and sent to re-treatment with sodium hydroxide and sodium aluminate containing filtrate is mixed with 1-2 M sulfuric acid solution so that pH reaches 6.4-7.4. Aluminum hydroxide precipitate obtained is filtered and rinsed with water to remove sodium ions, heated in drying box to 200°C at heating rate 10-20°C/h, and calcined in muffle kin for 5 h to 450°C at heating rate 50°C/h to give pulverulent aluminum oxide. The latter is treated for 10-12 min with aqueous solution of surfactant OP-10 with concentration 0.019-0.022% at 39-41°C and aluminum oxide-to-surfactant ratio 1:10, after which dried at room temperature.

EFFECT: increased adsorption capacity, reduced production cost, and utilized production waste.

1 tbl, 5 ex

 

The invention relates to the production of modified sorbents and can be used in food and chemical industries.

The closest in technical essence and the achieved effect of the present invention is a method of producing aluminum oxide by deposition of the hydroxide of aluminium-containing solutions, including deposition of aluminum hydroxide continuous introduction into the sodium aluminate solution of nitric acid at pH of 9.0 to 10.0 and a temperature of 90-95° [A.S. USSR №1658563, CL7C 01 F 7/02, publ. 20.02.96, bull. No. 5].

The disadvantages of this method are the use of an expensive reagent (nitric acid) and the need to use equipment made of special steel, which leads to high cost of this method.

The technical problem of the invention is the obtaining of the modified adsorbent with high adsorption capacity, reducing the cost of production and disposal of waste etching aluminum tape in the production of aluminium structures.

The technical problem is achieved in that in the method of obtaining modified sorbents, including the precipitation of aluminum hydroxide from sodium aluminate solution, drying and calcination, it is new that the modified sorbent is produced from aluminium-containing raw material, which is used as a departure tra is of aluminium in the production of aluminium structures by treating 50 g aluminium-containing feedstock at a temperature of 70°With 3-7% solution of sodium hydroxide in quantities of 100, 125 or 150 cm3within 3-5 hours, the precipitate is filtered and sent for re-treatment with sodium hydroxide, and the filtrate containing sodium aluminate, mixed with 1-2 M solution of sulfuric acid to obtain a pH of 6.4 to 7.4, the precipitate of aluminum hydroxide is filtered off and washed with water from sodium ions, after which the aluminum hydroxide is heated in an oven to a temperature of 200°C at a heating rate of 10-20°/h and calcined in a muffle furnace for 5 hours up to 450°C at a heating rate of 50°C/h, powdered aluminum oxide treated with an aqueous solution of surfactant OP-10 concentration 0,019-0,022% at a temperature 39-41°ratio of aluminum oxide and surfactant solution 1:10 respectively for 10-12 min and dried at room temperature.

The technical result consists in obtaining the modified adsorbent with high adsorption capacity of the waste etching aluminum tape in the production of aluminium structures.

The method of obtaining modified sorbent is as follows.

50 g of aluminium-containing raw material, which is used as the waste etching aluminum tape in the production of aluminum structures is treated at a temperature of 70° With 3-7% solution of sodium hydroxide in quantities of 100, 125 or 150 cm3within 3-5 hours, the precipitate is filtered and sent for re-treatment with sodium hydroxide, and the filtrate containing sodium aluminate, mixed with 1-2 M solution of sulfuric acid to obtain a pH of 6.4 to 7.4, the precipitate of aluminum hydroxide is filtered off and washed with water from sodium ions, after which the aluminum hydroxide is heated in an oven to a temperature of 200°C at a heating rate of 10-20°/h and calcined in a muffle furnace for 5 hours up to 450°C at a heating rate of 50°C/h, powdered aluminum oxide treated with an aqueous solution of surfactant OP-10 concentration 0,019-0,022% at a temperature 39-41°ratio of aluminum oxide and surfactant solution 1:10 respectively for 10-12 min and dried at room temperature.

The method is illustrated by the following examples.

Example 1. In the reactor serves 50 g of waste etching aluminum tape (95-98% Al2About3, CuO, Mg(OH)2, Fe2About3- 2-5%) and mixed with 5%sodium hydroxide solution in the amount of 100 cm3at a temperature of 70°C for 3 hours, the precipitate is filtered and sent for re-treatment with sodium hydroxide. Then the filtrate is sent to the reactor, where the process odnomernym solution of sulfuric sour the s to pH 6.4. The precipitate is separated on a filter and fed into the reactor for washing with water, and then sent in an oven where heated to 200°C. Powdered aluminum oxide treated with an aqueous solution of surfactant OP-10 concentration 0,019% at a temperature of 40°C for 9 minutes Modified sorbent is dried at room temperature. The results of the experiments are shown in the table.

Example 2. In the reactor serves 50 g of waste etching of aluminum tape and mixed with 5%sodium hydroxide solution in the amount of 150 cm3at a temperature of 70°C for 3 hours, the precipitate is filtered and sent for re-treatment with sodium hydroxide. Then the filtrate is sent to the reactor, where the process odnomernym sulfuric acid solution to pH 7.0. The precipitate is separated on a filter and fed into the reactor for washing with water, and then sent in an oven where heated to 200°C. a Layer of powdered hydroxide aluminum treated with an aqueous solution of surfactant OP-10 concentration 0,020% at a temperature of 40°within 10 minutes the Modified sorbent is dried at room temperature. The results of the experiments are shown in the table.

Example 3. In the reactor serves 50 g of waste etching of aluminum tape and mixed with 5%sodium hydroxide solution in the amount of 125 cm3sodium hydroxide while the temperature is ur 70° C for 3 hours, the precipitate is filtered and sent for re-treatment with sodium hydroxide. Then the filtrate is sent to the reactor, where the process odnomernym sulfuric acid solution to pH 7.0. The precipitate is separated on a filter and fed into the reactor for washing with water, and then sent in an oven where heated to 200°C. a Layer of powdered aluminum oxide treated with an aqueous solution of surfactant OP-10 concentration 0,021% at a temperature of 40°C for 11 minutes Modified sorbent is dried at room temperature. The results of the experiments are shown in the table.

Example 4. In the reactor serves 50 g of waste etching of aluminum tape and mixed with 5%sodium hydroxide solution in the amount of 125 cm3at a temperature of 70°C for 3 hours, the precipitate is filtered and sent for re-treatment with sodium hydroxide. Then the filtrate is sent to the reactor, where the process odnomernym sulfuric acid solution to pH 7.0. The resulting aluminum oxide is separated in the filter and fed into the reactor for washing with water, and then sent in an oven where heated to 200°C. a Layer of powdered aluminum oxide treated with an aqueous solution of surfactant OP-10 concentration of 0.022% at a temperature of 40°C for 12 minutes Modified sorbent is dried at room themes is the temperature value. The results of the experiments are shown in the table.

Example 5. In the reactor serves 50 g of waste etching of aluminum tape and mixed with 5%sodium hydroxide solution in the amount of 125 cm3at a temperature of 70°C for 3 hours, the precipitate is filtered and sent for re-treatment with sodium hydroxide. Then the filtrate is sent to the reactor, where the process odnomernym sulfuric acid solution to pH 7.0. The precipitate is separated on a filter and fed into the reactor for washing with water, and then sent in an oven where heated to 200°C. a Layer of aluminum oxide treated with an aqueous solution of surfactant OP-10 concentration is 0.023% at a temperature of 40°C for 13 minutes Modified sorbent is dried at room temperature. The results of the experiments are shown in the table.

Table
ExampleThe amount of alkali mlTemperature, °The amount of surfactant OP-10, %Processing time surfactant OP-10, minWeight of the modified sorbent, gThe effect of bleaching, %
Example 1100380,01995,0057,2
Example 215039 0,020103,8061,3
Example 3125400,021116,3463,2
Example 4125410,022124,0561,8
Example 5125420,023133,4060,9

As the table shows, the highest yield of aluminum oxide obtained from 50 g of a by-product of etching aluminum tape containing Al2O3treated at a temperature of 70°With 5-7%solution of sodium hydroxide in the amount of 100 cm3, 125 cm3, 150 cm3within 3 hours. If processing less than 3 hours, the process of interaction of alumina with sodium hydroxide will not happen completely, more than 3 hours is not economically feasible.

In the processing of surfactant increases the total adsorption capacity of the sorbent. Handling of powdered aluminum oxide surfactant OP-100 concentration 0,019-0,022%, temperature processing 39-41°C, the processing time is 10-12 minutes needed to obtain a high adsorption capacity of the sorbent. The concentration of processing powder of aluminum oxide with an aqueous solution of surfactant OP-100 less 0,019% and above 0,022 reduces the adsorption capacity of the sorbent. The ratio of aluminum oxide and surfactant solution 1:10, respectively, is effective, the change in the ratio leads to a decrease in the sorption capacity of the sorbent.

The proposed method allows

to obtain the modified adsorbent with high adsorption capacity;

to reduce the cost of production;

to dispose of the waste etching aluminum tape in the production of aluminium structures.

A method of obtaining modified sorbents, including the precipitation of aluminum hydroxide from sodium aluminate solution, drying and calcination, wherein the modified sorbent is produced from aluminium-containing raw material, which is used as the waste etching aluminum tape in the production of aluminum structures, by treating 50 g aluminium-containing feedstock at a temperature of 70°With 3-7%sodium hydroxide solution in amounts of 100, 125 or 150 cm3within 3-5 h, the precipitate is filtered and sent for re-treatment with sodium hydroxide, and the filtrate containing sodium aluminate, mixed with 1-2 M solution of sulfuric acid to obtain a pH of 6.4 to 7.4, the precipitate of aluminum hydroxide is filtered off and washed with water from sodium ions, after which the aluminum hydroxide is heated in an oven to a temperature of 200°when soon the minute heating 10-20° C/h and calcined in a muffle furnace for 5 h to 450°C at a heating rate of 50°C/h, powdered aluminum oxide treated with an aqueous solution of surfactant OP-10 concentration 0,019-0,022% at a temperature 39-41°and the ratio of aluminum oxide and surfactant solution 1:10, respectively, for 10-12 minutes and dried at room temperature.



 

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