RU2254373C2 - Method of a diffusion juice clarification - Google Patents

Abstract

FIELD: sugar industry.

SUBSTANCE: the invention is pertaining to the field of sugar industry, in particular, to methods pf diffusion juices clarification. The method provides for a heating a diffusion juice and injection in it of a coagulant - aluminum hydroxychloride - till its concentration makes 0.01-0.12 g/l. Then conduct a predefecation, a defecation and a juice saturation. The saturation sediment is separated from the juice and a part of the produced saturation juice is returned into the phase of the predefecation. At that the part of the juice is also added with the indicated coagulant till its concentration makes 0.01-0.12 g/l. The saturation juice fed to separation of the sediment deposit is added with a flocculant - a copolymer of acrylamide with a sodium acrylate with anionic activity of 30-40 % till its concentration makes 0.004-0.030 g/l. The predefecated juice is also added with the indicated flocculant till its concentration makes 0.001-0.020 g/l. The sediment formed in the process of the predefecation is removed from the predefecated juice. The invention ensures an increased efficiency of the diffusion juice clarification and decreased lime input for the clarification.

EFFECT: the invention ensures an increased efficiency of the diffusion juice clarification and a decreased lime input for the clarification.

2 cl, 6 ex, 1 dwg, 2 tbl

Description

The invention relates to the sugar industry and can be used in the production of sugar.

A known method of purification of a sugar-containing solution in the production of sugar (A.S. 1240785), which provides for the production of diffusion juice from the feedstock, its heating, pre-defecation, the introduction of coagulant at the stage of pre-defecation at pH 8.2-9.5, defecation, saturation, separation of sediment , sulfitation and further processing. At the same time, aluminum sulfate is used as a coagulant in an amount of 0.04-0.08% by weight of juice. The introduction of aluminum sulfate at the pre-defecation stage significantly increases the cleaning effect.

The disadvantage of this method is the formation of an additional significant amount of solid phase, forming difficult to separate precipitation due to the very small particle size. Filtration and sedimentation properties change, which entails the requirements for increasing the filtration area and the settling mirror of the equipment used, which complicates the process flow chart, increasing costs, thereby reducing the economic efficiency of the method.

The closest method of the same purpose to the claimed invention according to a combination of features is the method of purification of a sugar-containing solution according to A.S. No. 1113412, which is taken as a prototype.

The method for purification of diffusion juice involves preliminary coagulation of non-sugars with a reagent or a (NH ₄ ) ₂ SO ₄ salt in an amount of 0.029-0.035%, or Na ₂ SO ₄ or Na ₂ SO ₃ in an amount of 0.09-0.11% by weight of solids , defecosaturation, administration of a polyacrylamide flocculant, predefecation, defecation, saturation and filtration.

Obtaining diffusion juice from beets and its purification by this method is as follows. Beets are crushed into chips, it is desugared by extraction in a diffusion apparatus with the removal of diffusion juice and pulp from it.

The diffusion juice is heated to a temperature of 44-47 ° C, any of the above salts is added in an appropriate amount, the suspension of 2nd saturation juice containing CaO is returned (defecosaturation is carried out as an option: CaO and CO ₂ are added. Then a flocculant is added.

After this, pre-defecation is carried out at the same temperature for 15 minutes, the juice is heated to 85 ° C, basic defecation, saturation with the introduction of milk of lime before the last are carried out. The separated juice is filtered and 2nd saturation juice is obtained.

In the process of purification of diffusion juice by this method, a reagent for coagulation of non-sugars and a flocculant to obtain an aggregated precipitate are introduced into diffusion juice before predefection.

The disadvantage of this method is inherent in the method of the possibility of destruction obtained by flocculation of sludge aggregates under the action of the active forces of hydrodynamics and tempering the juice flow in subsequent processes prior to filtration due to their insufficient strength. In connection with the aforementioned, the appearance of the destruction of turbidity is a finely dispersed part of the sediment, which affects its filtration and sedimentation properties. Therefore, the cleaning efficiency is reduced.

Another disadvantage of this method is the complexity of technological methods.

The technical result of the invention is to increase the cleaning effect of diffusion juice while reducing the consumption of lime, while without the inclusion of additional capital-intensive technological methods.

To achieve a technical result, a method is proposed for purifying diffusion juice, which involves heating it, introducing a coagulant and flocculant, predefining, defecating, saturating, separating the precipitate from saturation juice and returning part of the saturation juice to predefining, characterized in that aluminum hydroxide is used as a coagulant, introduced it into heated diffusion juice and into the return of saturation juice until its concentration reaches 0.01-0.12 g / l, while the acrylamide-acry copolymer is used from flocculants sodium atom to the anionic activity of 30-40% and is administered in carbonated juice is directed to the separation of sludge, until its concentration 0,004-0,030 g / l.

In addition, it is advisable to introduce the indicated flocculant into the pre-defecated juice until a concentration of 0.001-0.020 g / l is reached and the precipitate formed is removed in an appropriate way.

The use of aluminum hydroxide chloride and a copolymer of acrylamide with sodium acrylate with anionic activity of 30-40% and introducing them into the stream at the indicated points allows for more complete physicochemical deposition of pollutants from the liquid phase of diffusion juice, effective removal of precipitated non-sugars by improving filtration and sedimentation properties of the obtained precipitate. In combination, this will increase the efficiency of purification of diffusion juice while reducing the consumption of that part of the limestone that is consumed for structuring the sediment (for defecation and saturation).

When using aluminum hydroxychloride in the proposed method, in addition to destroying the stability of the IUD colloids, it exhibits the property of forming chemical compounds with non-sugars, transferring them from the dissolved state to the solid phase of the precipitate. In addition, it was found that in solutions in the presence of sucrose the aluminum cations of this substance acquire a high polymer form, due to which the aggregating properties of the particles of precipitated nesugars of the smallest size are additionally manifested. The use of these qualities of aluminum hydroxychloride in combination with flocculation with anionic activity of a 30-40% copolymer of acrylamide with sodium acrylate, this method allows aggregation over the entire spectrum of the dispersion fineness, including in the region of particles forming turbidity and color. As a result, a suspension appears in which the solid phase of non-sugars is represented by large, clearly defined flocs, and the liquid phase of diffusion juice is represented by a transparent liquid. The separation of the resulting suspension into phases with high efficiency can be performed by existing hydromechanical processes: sedimentation and filtration.

For the purification of a sugar-containing solution, copolymers of acrylamide with sodium acrylate with anionic activity of 30-40% work most effectively. When using this substance with anionic activity of less than 30%, a slight improvement in the main technological parameters of sugar-containing solutions is observed. The use of a copolymer of acrylamide with sodium acrylate with anionic activity of more than 40% is associated with a significant increase in the cost of producing such a product, which makes its use in the proposed method not economical.

In addition, the introduction of reagents must be consistent and the gap in the introduction of reagents should be at least 0.5 minutes. Studies have shown that with the simultaneous introduction of reagents, the purity of the juice increases slightly from 85 to 85.3% instead of 87.4%, as with sequential administration, and the rate of sedimentation of the solid phase increases to 13.1 cm / min, but less efficiently, as for example, with sequential administration, up to 20.0 cm / min. This phenomenon can be explained by the kinetics of the interaction of aluminum hydroxochloride with non-sugars during the formation of a solid phase and coagulation.

The drawing shows a graph of the change in the average size of the flocs over time with stirring of the sugar-containing defecated solution with a copolymer of acrylamide with sodium acrylate.

The method is as follows.

Diffusion juice is heated to a temperature of 50 ° C and sent to progressive predefection, which is carried out to a pH of ₂₀ at the outlet of the predefector, equal to 11.2-11.6. Of the reagents, aluminum hydroxide chloride is first used in an amount of 0.01-0.12 g / l, which is introduced into the diffusion juice and into the return of the filtered unfiltered juice directed to progressive predefection.

Then the juice is processed with lime milk according to the active alkalinity of phenolphthalein 0.4-0.9% CaO, cold defecation is carried out to 60 ° C for 20 minutes and hot defecation at 85-90 ° C for 10 minutes.

The defecated juice is heated to 85-90 ° C, then the first saturation is carried out until a pH of 11.4-11.6 is reached.

A portion of unfiltered, saturated juice is returned to progressive predefection.

A copolymer of acrylamide with sodium acrylate in an amount of 0.004-0.030 g / l is introduced into the remaining unfiltered saturated juice and sent to remove the precipitate (by thickening or by filtration).

The filtered juice is again heated to 95-97 ° C, the juice is treated with milk of lime until alkalinity of 0.20-0.25% CaO with phenolphthalein, and defecation is carried out for 5 minutes. If necessary, according to the method, aluminum hydroxochloride is introduced in an amount of 0.06-0.10 g / l.

Then saturate to achieve a pH of 9.2 to 9.4.

Then, a copolymer of acrylamide with sodium acrylate is introduced in an amount of 0.0005-0.010 mg / L and the saturated juice is kept for 10 minutes to ripen. This unfiltered juice of the second saturation is sent to remove the precipitate. After filtration, the suspension with sediment is returned for progressive predefec tion to an area with an equal pH, and the filtered juice is sent to obtain a syrup.

To remove the precipitate after pre-defecation, the acrylamide copolymer is introduced with sodium acrylate in an amount of 0.050-10,000 g / l when the pH of the juice reaches 11.0-12.0 after lime is added, then the pre-defecated juice is sent to the separation of liquid and solid phases (sedimentation, filtration) with the release of coagulate, and clarified juice is sent to the main defecation.

At all of the indicated steps for introducing reagents into the technological processes, aluminum hydroxychloride is introduced into the solution being treated, keeping under continuous stirring for at least 0.5 minutes, then, subsequently, as described above, an additional copolymer of acrylamide with sodium acrylate with anionic activity of 30–40% is added to the treated solution , this is introduced with continuous stirring and the exposure time is at least 0.5 minutes.

Reagents are selected experimentally to achieve a technical result of the invention.

Reagents are produced in industrial production in the form of bulk powders. They are used in the form of 3-5%, and 0.01-0.05% aqueous solutions, dissolving them in either pure or ammonia or barometric waters at a temperature of 10-95 ° C, preferably 35-75 ° C . Reagent solutions are dosed into processed sugar-containing solutions based on the weight of the powder per volume of the solution being purified. The amount of introduced reagent is also determined experimentally. With the introduction of less or more of these amounts, the conditions for separation and filtration of precipitates worsen.

The dose of reagents, the sequence of their introduction and the duration of the process was determined in laboratory conditions. In the process of cleaning, the basic technological indicators of the juice are analyzed and the effect of juice purification in the juice purification department is determined. The results of the analysis of juice by the proposed method are shown in table 1.

In parallel, the diffusion juice is cleaned by a known method (option No. 1): all operations are as described above, but the juice is treated with lime milk by the active alkalinity of phenolphthalein 1.25% CaO without treatment with reagents.

Example 1 (Option 1, see table)

Diffusion juice (CB = 14.0%; DB = 87.2%) is heated to a temperature of 50 ° C and directed to predefection, where, with stirring, the return of unfiltered juice of the 1st saturation and suspension of the 2nd saturation are introduced, maintaining a pH of ₂₀ at the exit of the predefector equal to 11.2-11.6.

Then, juice is treated with milk of lime by active alkalinity for phenolphthalein 1.20-1.25% CaO, cold defecation is carried out to 60 ° C for 20 minutes and hot defecation at 87.5 ° C for 10 minutes. The defecated juice is heated to 90 ° C, then the first saturation is carried out until a pH of 11.2-11.6 is reached, then it is directed to sediment removal by settling and filtration. The resulting suspension is sent to vacuum filtration, and the filtered juice to a second carbon dioxide saturation.

Moreover, the achieved basic technological indicators of juice after settling amounted to the following values: DB = 89.8-91.0%, CV = 17.9 srvc .; sedimentation rate = 3.6 cm per minute. The cleaning effect of 32.6%.

Example 2 (Option 2, see table)

The process was conducted similarly to the above.

Active alkalinity at the main bowel movement for phenolphthalein 1.0-1.25% CaO

Only one of the proposed reagents was used for purification of diffusion juice: aluminum hydroxychloride in an amount of 0.04 g / l of juice with continuous stirring and a holding time of 0.5 minutes.

Moreover, the achieved basic technological indicators of juice after settling amounted to the following values: DB = 89.8%, CV = 23.8 srvc .; sedimentation rate = 3.6 cm per minute. The cleaning effect of 40.4%.

Example 3 (Option 3, see table)

The process was conducted similarly to the above.

Active alkalinity at the main bowel movement for phenolphthalein 1.4% CaO

Only copolymer of acrylamide with sodium acrylate in the amount of 0.0014 g / l of juice is introduced into unfiltered, saturated juice, keeping it under continuous stirring for 0.5 minutes.

At the same time, the achieved basic technological indicators of juice after sedimentation amounted to the following values: DB = 89.9%, CV = 24.8 srvc .; sedimentation rate = 3.4 cm per minute. The cleaning effect of 40.4%.

Example 4 (Option 4, see table)

Diffusion juice (CB = 14.2%; DB = 86.2%) is heated to a temperature of 50 ° C and sent for predefection, where, with stirring, the return of unfiltered juice of the 1st saturation and suspension of the 2nd saturation are introduced, maintaining a pH of ₂₀ at the exit of the predefector equal to 11.2-11.6.

Then the juice is treated with lime milk according to the active alkalinity of 0.85% CaO with phenolphthalein, cold bowel movements up to 60 ° C for 20 minutes and hot bowel movements at 87.5 ° C for 10 minutes. The defecated juice is heated to 90 ° C, then the first saturation is carried out until a pH of 11.2-11.6 is reached.

In the return of unfiltered saturated juice from the reagents, aluminum hydroxochloride is first introduced in an amount of 0.04 g / l of juice with continuous stirring and the exposure time is 0.5 minutes. Then, a copolymer of acrylamide with sodium acrylate in the amount of 0.002-0.005 g / l of juice is introduced into unfiltered, saturated juice, keeping it under continuous stirring for 0.5 minutes and sent to remove the precipitate by settling and filtering. The resulting suspension is sent to vacuum filtration, and the filtered juice to a second carbon dioxide saturation.

At the same time, the achieved main technological indicators after settling amounted to the following values: DB = 91.2%; Tsv = 19.9%; sediment deposition rate of 4.6 cm per minute. The cleaning effect of 34.3%.

Example 5 (Option 5, see table)

Diffusion juice (CB = 14.2%; DB = 86.2%) is heated to a temperature of 50 ° C and sent for predefection, where, with stirring, the return of unfiltered juice of the 1st saturation and suspension of the 2nd saturation are introduced, maintaining a pH of ₂₀ at the exit of the predefector equal to 11.2-11.6.

Then the juice is treated with lime milk according to the active alkalinity of phenolphthalein 1.25% CaO, cold defecation is carried out to 60 ° C for 20 minutes and hot defecation at 87.5 ° C for 10 minutes. The defecated juice is heated to 90 ° C, then the first saturation is carried out until a pH of 11.2-11.6 is reached.

To return unfiltered saturated juice from the reagents, aluminum hydroxochloride is first introduced in an amount of 0.012 g / l of juice with continuous stirring and the exposure time is 0.5 minutes. Then, a copolymer of acrylamide with sodium acrylate in the amount of 0.006 g / l of juice is introduced into unfiltered, saturated juice, keeping for 0.5 minutes with continuous stirring, and sent to sediment removal by sedimentation and filtration. The resulting suspension is sent to vacuum filtration, and the filtered juice to a second carbon dioxide saturation.

At the same time, the achieved main technological indicators after settling amounted to the following values: DB = 97.0%; Tsv = 19.1%; sedimentation rate of 24 cm per minute. The cleaning effect of 80.7%.

Example 6 (Option 6, see table)

Diffusion juice (CB = 10.8%; DB = 86.8%) is heated to a temperature of 50 ° C and sent to pre-defecation, where, with stirring, the return of unfiltered juice of the 1st saturation and suspension of the 2nd saturation is introduced, maintaining a pH of ₂₀ at the exit of the predefector equal to 11.2-11.6.

Then the juice is treated with milk of lime by active alkalinity for phenolphthalein 1.65% CaO, cold defecation is carried out up to 60 ° C for 20 minutes and hot defecation at 87.5 ° C for 10 minutes. The defecated juice is heated to 90 ° C, then the first saturation is carried out until a pH of 11.2-11.6 is reached.

To return unfiltered saturated juice from the reagents, aluminum hydroxochloride is first introduced in an amount of 0.012 g / l of juice with continuous stirring and the exposure time is 0.5 minutes. Then, a copolymer of acrylamide with sodium acrylate in the amount of 0.010 g / l of juice is introduced into unfiltered, saturated juice, keeping for 0.5 minutes with continuous stirring, and sent to sediment removal by sedimentation and filtration. The resulting suspension is sent to vacuum filtration, and the filtered juice to a second carbon dioxide saturation.

At the same time, the achieved main technological indicators after settling amounted to the following values: DB = 91.8%; Tsv = 18.2%; sediment deposition rate of 45 cm per minute. The cleaning effect of 41.3%.

As can be seen from the table, the purity of the juice after 1 saturation is 2.4% higher, the deposition rate increased by 4-5 times and the decantate is purified to a suspended particle content of less than 12 mg / L.

Thus, according to minor changes in the main technological indicators of juice, as can be seen from the table, each reagent individually works much less efficiently than in the aggregate:

- the purity of the juice increases to 86% with the introduction of aluminum hydroxochloride, but the deposition rate obtained by co-precipitation with lime solid phase drops to 3 cm / min

or

- the rate of deposition of the solid phase obtained by interaction with lime increases to 12.3 cm / min, and the purity of the filtered juice remains at the same level.

In a sugar-containing solution, copolymers of acrylamide with sodium acrylate with anionic activity of 30-40% work most effectively. When using this substance with anionic activity of less than 30%, a slight improvement in the main technological parameters of juice is observed (see table 1, option No. 4, columns 10-15). The use of a copolymer of acrylamide with sodium acrylate with anionic activity of more than 40% is associated with a significant increase in the cost of producing such a product, which makes its use in the proposed method not economical.

In addition, the introduction of reagents must be consistent and the gap in the introduction of reagents should be at least 0.5 minutes. It is enough to compare the data on the main technological indicators of the juice given in the lines with options No. 5 and No. 7 of table 1. With the simultaneous introduction of reagents, the purity of the juice increases slightly from 85 to 85.3% instead of up to 87.4%, as with sequential introduction, and the rate of sedimentation of the solid phase increases to 13.1 cm per minute, but less efficiently, as, for example, with sequential administration, up to 20.0 cm per minute. This phenomenon can be explained by the kinetics of the interaction of aluminum hydroxochloride with non-sugars during the formation of a solid phase and coagulation.

There is also a kinetics of sediment aggregation when processing a suspension of juice with acrylamide-sodium acrylate copolymers. The change in the average size of the flocs in time with mixing of the sugar-containing solution with a copolymer of acrylamide with sodium acrylate in time is shown in the drawing. For almost the entire range of copolymers (with anionic activity of 30 and 40%), the formation and formation of flocs occurs in 0.3-0.5 minutes, see the curves in the drawing. Therefore, the method notes the exposure time as the ripening time of the flocs before phase separation.

Thus, as can be seen from the above data, the introduction of a combination of the above precipitating reagents into the sugar-containing solution in the indicated sequence and amount increases the purity or quality of the solutions by 2.4%, gives a transparent decantate with a deposition rate of the obtained solid phase of 20.0-24.0 cm per minute, while the increase in cleaning efficiency increases by 16.62-18.34%, depending on the quantity and quality of the supplied reagents.

Precipitation becomes stable, their sedimentation qualities improve: the sedimentation rate of the precipitate after treatment increases by 4-5 times. When settling, the entrainment of the solid phase with clarified juice is not more than 15 mg per liter.

In industrial conditions, the proposed method is implemented as follows.

Sugar-containing solution, which is a diffusion juice, is obtained by grinding beet root crops with a sugar content of 14.5-16.9%, extraction of beet chips in a diffusion apparatus with the removal of diffusion juice.

In a diffusion juice, having a purity of 84-87.2%, aluminum hydroxochloride in the amount of 0.04-0.06 g / l is first introduced with continuous stirring, then it is heated to a temperature of 50 ° C and sent to progressive predefection, where with stirring gradually introducing a mixture of suspensions from the first and second saturation and milk of lime, maintaining a pH of ₂₀ at the outlet of the predefector equal to 11.2-11.4.

Then the juice is treated with milk of lime by active alkalinity for phenolphthalein 0.85-1.65% CaO, cold defecation is carried out to 60 ° C for 20 minutes and hot defecation at 87 ° C for 10 minutes. The defecated juice is heated to 90 ° C, then the first saturation is carried out until a pH of 11.4-11.6 is reached. Aluminum hydroxide chloride in an amount of 0.02-0.06 g / l with continuous stirring is additionally introduced into the returnable part of the filtered unfiltered juice, directed to progressive predefection.

A copolymer of acrylamide with sodium acrylate in the amount of 0.003-0.006 g / l is introduced into the remaining unfiltered, saturated juice, keeping it under continuous stirring for 10 minutes, and sent for thickening and filtration. The resulting suspension is sent to vacuum filtration, and the filtered juice to a second carbon dioxide saturation.

The filtered juice treated with aluminum hydrochloride is again heated to 97 ° C, the juice is treated with lime milk to a phenolphthalein alkalinity of 0.25% CaO, defecated for 5 minutes and saturated until pH 9.2-9.4 is reached, acrylamide copolymer is introduced with sodium acrylate in an amount of 0.002-0.004 g / l, with the aging of the saturated juice with continuous stirring and its filtration. After filtration, the suspension with sediment is returned for progressive predefec tion to an area with an equal pH, and the filtered juice is sent to obtain a syrup.

In parallel, the diffusion juice is cleaned by a known method: all operations are as described above, but they perform juice treatment with lime milk according to the active alkalinity of phenolphthalein 1.25-1.40% CaO without treatment with reagents.

The dose of reagents, the sequence of their introduction and the duration of the process is determined in laboratory conditions, depending on the quality of the beets currently being processed.

In the process of cleaning, the basic technological indicators of the juice are analyzed and the effect of juice purification in the juice purification department is determined.

The results of the analysis of diffusion juice and the achieved main technological indicators for the known and proposed methods are shown in table 2.

The introduction of precipitating reagents and milk of lime by active alkalinity for phenolphthalein 0.85% CaO (see option No. 4, column 6) allows to reduce the consumption of lime for basic bowel movements by 40.6%.

With a greater reduction in lime consumption to 0.1-0.4% CaO and reagent consumption within the indicated limits (these data are not shown in the table), the cleaning efficiency was sufficient to preserve the filtering properties and the color of the finished sugar remained unchanged above 0.8 srvc units, i.e. Meets the requirements of GOST 21-78.

When processing beets of long-term storage and overrun of lime by 17.2% due to a decrease in the quality of juice by a known method, see option No. 2 and 42.8%, see option No. 3, the cleaning efficiency remains at the level of 40.4%, cm column 14, while the content of calcium salts increased from 0.028% to 0.054 and 0.040%, see column 16. The purity of the juice remains almost the same.

According to the proposed method with an excessive consumption of lime, the cleaning efficiency increased by 11.2%, see option No. 6, and 48.1%, option No. 5. The purity of the juice according to the proposed method is increased by 0.2-6.2%, see table 2, options No. 4-6, columns 12, 13 and in a particular case reached 97%.

Under the combined action of reagents and dissolved lime, some of the non-sugars are stably decomposed with a minimum yield of coloring substances, including the oxidation of polyphenols without a significant increase in color. Even with a significant reduction in the consumption of lime for basic bowel movements, the color of the juice does not increase and remains at the level of 19.9 standard units.

With active filtration at a rate of 10-13 l / m ² min on filtering self-unloading filters (Fils), the filtrate exits with a breakthrough of the solid phase through the filter cloth 5-40 mg / l of juice. The number of filters used in the work was reduced by 30%.

At the stage of hot bowel movement with a fairly complete decomposition of reducing and other non-sugars under the influence of reagents and lime, calcium salts are formed, which decompose after the second saturation with salts of potassium carbonate, sodium, that is, by reducing the natural alkalinity of the juice. A decrease in calcium salts by one and a half times relative to the compared method allows to achieve the minimum values of their concentrations - up to 0.02% CaO.

The proposed method has passed industrial tests at the sugar factory OJSC "Elan". The test results showed the high efficiency of the method and the possibility of its multipurpose use: both to reduce the consumption of lime when it is deficient in the production environment, and to increase the extraction of sucrose from beets and increase the yield of sugar. Moreover, the use of the proposed method allowed to reduce material and energy resources for the purification of diffusion juice by reducing the consumption of limestone and coal by 30%, removing one of the three kilns in the hot reserve and shutting down one of the three saturation gas compressors, and also increasing the sugar yield with an increase in the purity of the diffusion juice aimed at evaporation.

During the test period, the following technological indicators were established:

1. The increase in the effect of juice purification at the stage of the 1st saturation was 10.83%.

2. The increase in the purity of sulfated juice was 1.51%.

3. The decrease in sugar loss in the filter cake by increasing the porosity of the cake was 0.04%.

4. The number of operating equipment decreased by 25-30%.

5. The operating mode and temperature regime of combustion in calcareous gas furnaces were stabilized. The temperature of the off-gas saturation gas was stably maintained at a level of 80-120 ° C.

6. To ensure the operation of the juice purification station, the work of two furnaces was sufficient. one of the three furnaces began to work with minimal load.

Thus, the technical result of the invention was achieved: increasing the cleaning effect of the sugar-containing solution while reducing the consumption of lime and at the same time the stability of sugar production when the quality of the raw materials deteriorates (regardless of the quality of the raw materials) without the inclusion of additional technological methods; reduction of material, energy costs, reduction of the cost of the finished product.

Claims (2)

1. The method of purification of diffusion juice, providing for its heating, the introduction of a coagulant and flocculant, pre-defecation, defecation, saturation, separation of the precipitate from saturation juice and the return of part of the saturation juice for pre-defecation, characterized in that aluminum hydroxide is used as a coagulant, it is introduced into heated diffusion juice and return of saturation juice to a concentration of 0.01-0.12 g / l, while from a flocculant use a copolymer of acrylamide with sodium acrylate with anionic activity of 30-40% and its introduction ny in carbonated juice is directed to the separation of sludge, until its concentration 0,004-0,030 g / l. 2. The method according to claim 1, characterized in that the indicated flocculant is introduced into the pre-defecated juice until a concentration of 0.001-0.020 g / l is reached and the precipitate formed is removed.