The solvent extraction method

 

(57) Abstract:

Usage: in the process of separation of liquid mixtures by extraction in the refining, petrochemical, chemical industry and other industries. The inventive liquid-liquid extraction involves the insertion of the original mixture components between the raffinate and extract sections of the extractor, the flow in the primary solvent extractor to create the flow of the extract solution and a wash solvent or antibacterial for initiating flow ravintola solution, the output of the extractor of the final extract, the primary and intermediate ravinath solutions with subsequent regeneration of these solvents and obtaining the extract and two refined. The stream ravintola solution in the intermediate section of the extract section is divided into two parts, forming two zones countercurrent contacting the raffinate and extract solutions. One part ravintola solution and the extract solution in contact in the area adjacent to the place of the input mixture in the extractor, in another area the rest of ravintola solution in contact with the extract solution obtained by the commissioning of additional solvent in EC is tositsa to the field of chemical technology and can be used in processes for separating mixtures of components liquid extraction in petroleum refining, petrochemical, chemical, food industry and other industries.

The closest in technical essence and the achieved effect to the proposed method, i.e. the prototype method is solvent extraction, including the input of the original mixture components between the raffinate and extract sections of the extractor, submission to the extractor selective solvent to create the flow of the extract solution and a wash solvent or antibacterial for initiating flow ravintola solution, the output of the extractor of the final extract, the primary and intermediate ravinath solutions with subsequent regeneration of these solvents and obtaining two refined and extract (Ed.St. 1587061, C 10 G 21/16 B. I. N 31, 1990).

The purpose of the invention to eliminate the disadvantages of this method (prototype), namely: low sharpness of separation of the mixture on the edge between raffinate components and the high consumption of solvents.

This objective is achieved in that in the liquid-liquid extraction, including the input mixture between the raffinate and extract sections of the extractor, the flow in the primary solvent extractor to create the flow of the extract solution and the ora of the final extract, basic and intermediate ravinath solutions with subsequent regeneration of these solvents and obtaining the extract and two refined, the flow ravintola solution in the intermediate section of the extract section is divided into two parts, forming two zones countercurrent contact ravintola the extract solution, and one part ravintola solution and the extract solution in contact in the area adjacent to the place of the input mixture in the extractor, in another area the rest of ravintola solution in contact with the extract solution obtained by the commissioning of additional selective solvent in the extractor in the cross-section of the intermediate ravintola solution.

This method can improve the sharpness of separation of the mixture on the edge between raffinate components and to reduce the specific consumption of solvents.

In Fig. 1 presents a diagram illustrating the method of solvent extraction. The initial mixture of components along the line 1 is introduced into the extractor 2 through line 3 serves solvent, line 4 enter a wash solvent or antibacterial. The main refinity solution in line 5, the intermediate refinity solution on line the STW 8 for heat and mass transfer between the flow ravintola 9 and extract 10 solutions. Using the separator 11 in the intermediate section of the extract section flow ravintola solution is divided into two parts, forming two zones countercurrent contacting zone 12 adjacent to the entry site of the original mixture in the extractor, zone 13, which eliminate intermediate refinity solution 6.

The invention is illustrated by the following examples of how to calculate the liquid-liquid extraction of the proposed method and the prototype.

The original three-component mixture is characterized by the following coefficients of selectivity (selectivity: the selectivity of the first component, mainly rolling in the primary raffinate, 12,3, the second component, mainly rolling in the intermediate raffinate, 3.5, and a third component, passing in extract 1.

The initial mixture contains 40% of the first 25% of the second and 35% wt. the third component. The selection of the final products division assumed to be equal to the potential content of components in the original mixture. Adopted by the efficiency of the extractor corresponds to 18 theoretical stages of extraction. As in the proposed method, and in the prototype, the initial mixture is injected at the ninth stage of extraction (steps from the top of the extractor), the traction (in the example adopted a solvent with a higher density than the original mixture and wash solvent).

Example 1 (the proposed method). Using the separator 11 refinity solution XI-stage extraction is divided into two parts. One part in the zone 12 in contact with the extract solutions on the steps of X-I the other part at the same speed, but in zone 13, contacting the extract solutions obtained by the commissioning of additional selective solvent through line 3 into the extractor 2 in the cross section of the intermediate ravintola solution 6. Used in the calculation of the flow of raffinate and extract the steps of extractor provided a submission to the extractor election and wash solvents are given in table. 1, the compositions of all three end products of the separation are given in table. 2.

Example 2 (the prototype). The process is carried out in the conditions of example 1 except that the flow separation ravintola solution of XI-th stage into two parts to form two zones countercurrent contact, resulting in the selection of intermediate ravintola solution selection intermediate ravintola solution is performed with an intermediate degree of extraction (in the example of the V-th stage), and the flow of raffinate and extract on the steps of the extractor have amount the t, the proposed method can improve the sharpness of separation of the mixture on the edge between raffinate components. Thus, a small difference between the compositions of leaf extracts of examples 1 and 2 and the same flow rate of the solvent in the prototype and the proposed method, which can be seen in equal numbers extracts from the plate 1 for both examples of calculation (for example 1 it is equal to 20 + 10 30 kg, and the flow of the extract of example 2), and the same flow of wash solvent (in both examples, the flow of raffinate excited by a wash solvent on the plate XVIII, equal, and he is 78 kg 100 kg original mix) is a small difference in the composition of the final extracts (the content of the target component in example 1 makes 97.9, as in example 2, 98.9 per cent). At the same time, the content of the target component in the primary raffinate of example 1 of 86.1% and in example 2 71.1% In the intermediate raffinate of similar magnitude are 74,8 and 52.2%, respectively, for the proposed method and the prototype. Thus, at a constant size of the extractors in the proposed method and the prototype (the size of the extractors are determined by the number of stages of extraction and the amount of internal threads) the sharpness of separation on the edge between raffinate components in predlagaemom flow extract from level 1 with 30 to 44 kg, which corresponds to an increase of the flow rate of the solvent by 46.6% of the consumption of wash solvent is increased by 19.2%, However, as both the final refined improved slightly: the content of the first component in the primary raffinate increased from 71.1 to 73,8% of the second component in the intermediate raffinate from 52.2 to 57.4%

The low quality of primary and intermediate refined due to the fact that in the prototype (Fig.2) intermediate raffinate obtained from ravintola V-th stage of extraction, which contains the first component, and in accordance with the material balance step of extracting a significant proportion of the first component transferred into the intermediate raffinate, which in turn facilitates the transition of the second component in the primary raffinate.

Thus, the proposed method solvent extraction can improve the sharpness of separation of the mixture on the edge between raffinate components and to reduce the specific consumption of solvents.

Primechanie in the proposed method figures the left column to speed extraction I-X correspond to the zone of the countercurrent contacting, adjacent to the entry site of the original mixture in the extractor, right column zone countercurrent contact oil extraction, including the input of the original mixture components between the raffinate and extract sections of the extractor, submission to the extractor electoral solution and a wash solvent or antibacterial for initiating flow ravintola solution, the output of the extractor of the final extract, the primary and intermediate ravinath solutions with subsequent regeneration of these solvents and obtaining the extract and two refined, characterized in that the flow ravintola solution in the intermediate section of the extract section is divided into two parts, forming two zones countercurrent contacting the raffinate and extract solutions, and one part ravintola solution and the extract solution in contact area, adjacent to the entry site of the original mixture in the extractor, in another area the rest of ravintola solution in contact with the extract solution obtained by the commissioning of additional selective solvent in the extractor in the cross-section of the intermediate ravintola solution.

 

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FIELD: petrochemical industry; devices for a liquid by a liquid extraction.

SUBSTANCE: the invention is pertaining to the field of petrochemical industry, in particular, to a device for a liquid by a liquid extraction. The invention is dealt with a multiplate device for realization in a vertical column of multistage an extraction of a liquid by a liquid using a counterflow principle. The device contains: plates, and each plate after a fine setting in a column takes a horizontal position and is supplied with a seal ring, which adjoins the inside surface of the column; a perforated working area; a chordal up-going channel located on one side of a plate and a vertical bead retaining a liquid and surrounding the working area of the plate and spaced apart from the plate periphery closer to its center. The height of the upward directed bead is sufficient to retained a heavy liquid on a working area of the plate preventing is appearance on the edge of the plate, where a leakage downwards is possible because of availability of a gap between the edge of the plate and then inside surface of the wall of the column. The invention ensures more efficient prevention of the heavy liquid leakages through the tightness along the edge of the plate.

EFFECT: the invention ensures more efficient prevention of the heavy liquids leakages through the sealing-in along the edge of the plate.

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FIELD: organic chemistry, analytical chemistry, chemical technology.

SUBSTANCE: method for extraction of aminonaphtholsulfoacids and aminophenolsulfoacids involves extraction with organic solvent wherein sodium dodecyl sulfate an aqueous solution is added to aqueous solution up to its concentration 1.5 x 10-4 mol/dm3, hydrochloric acid is added up to the concentration 1.5-1.6 mol/dm3. As extractant method involves using 1,4-dioxane in the volume ratio of extractant to sample = 1:10 and extraction is carried out from saturated solution of ammonium sulfate. Invention provides enhancing degree of extraction of aminonaphtholmonosulfoacids and aminophenolmonosulfoacids from aqueous solutions wherein extraction degree of sulfoacids is 96.1-99.6% after a single extraction. Invention can be recommended for concentrating 1-amino-2-naphthol-4-sulfoacid and 2-aminophenol-4-sulfoacid from treated sewage waters in manufacturing azodyes.

EFFECT: improved method for extraction.

1 tbl, 11 ex

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