Method of separating polydisperse solution of distillery stillage

FIELD: chemistry.

SUBSTANCE: invention relates to processes of separating polydisperse systems through vibroacoustic effect. The method of separating polydisperse solution of distillery stillage involves coagulation of colloidal and dissolved substances of a dispersed phase and subsequent separation of the solid fraction of the formed product from the solution with separation of the liquid fraction of the dispersed medium. The dispersed phase is coagulated in two steps by applying energy of acoustic vibrations on the solution in at least two spectra in the 1-18 kHz range, providing weakening of surface tension of colloidal and dissolved substances, and in the 80-400 Hz range, increasing their amplitude of vibration. Before coagulation of the dispersed phase from the solution through evacuation, volatile aromatic substances are separated in form of a condensate, and before the second step for applying energy of acoustic vibrations the solution is dehydrated by 20-50% in vacuum drying conditions with extraction of the water condensate.

EFFECT: invention provides environmentally safe non-waste technology of processing distillery stillage and widens the range of processed products.

 

The invention relates to processes for the separation of polydisperse systems methods electrophoresis and can be used in industrial processes fractionation of colloidal and soluble organic and mineral substances in colloidal solutions, emulsions, suspensions, for example, neutralization and disposal of liquid industrial waste and, in particular, for alcohol production waste stillage from getting dry protein and vitamin feedstuff, surface-active substances (surfactants) in the form of aromatic and non-native speakers of smell bards, and purified water suitable for technical purposes.

The known method of separation of dispersed media and colloidal solutions, according to which dispersed and colloidal particles subjected to chemical coagulation silicon-containing flocculant followed by the separation of the solid fraction of the formed product from the solution and the separation of liquid fractions of the dispersed medium (the description of the patent RU 2246447 IPC 7 C02F 1/56, B01D 21/01, 20.02.2005).

The disadvantage of this method is the use of a chemical reagent, which not only increases production costs but also when used in technological processes, for example, food production reduces the biological value and environmental safety get PR the products.

There is a method of separating a disperse medium in the form of alcohol stillage, providing for the removal of suspended, colloidal and dissolved organic and mineral impurities and volatile substances physico-chemical methods and the allocation of the aqueous phase, in which the coagulation of colloidal and dissolved substances spend aluminum hydroxide, and the removal of organic and mineral admixtures reverse osmosis membranes with a pore diameter of not more than (10-15)×10-10m (the description of the patent of the Russian Federation 2128688, IPC 7 C12F 3/10).

A disadvantage of the known technical solution is the use of an expensive reagent and expensive equipment. In addition, secreted protein balance due to the use of chemical coagulation method as livestock feed is unsafe. Removal of volatile substances in the atmosphere leads to the pollution of the air space and reduces the environmental safety of the method.

The objective of the invention is to design environmentally safe and cost-effective method of separation of polydisperse solutions on the basis of vibro-acoustic methods of coagulating the dispersed phase colloidal and dissolved substances.

The technical result is to simplify the process of separation of colloidal solutions and, in particular, the ability to create environmentally safe is wasteless processing of alcohol stillage and expanding the range of products of processing.

The technical result is achieved by the method of separation of polydisperse solution of alcohol stillage involving the coagulation of colloidal and dissolved substances dispersed phase and the subsequent separation of the solid fraction of the formed product from the solution with separation of the liquid fraction of the dispersed environment, the coagulation of the dispersed phase is carried out in two stages impact on the solution of the energy of acoustic waves, at least two spectra, respectively, in the range of 1-18 kHz, providing a weakening of the surface tension of colloidal particles and dissolved substances, and the range of 80-400 Hz, providing an increase in the oscillation amplitude, while before coagulation of the dispersed phase from the solution by vacuum emit volatile aromatic substances in the form of condensate, and before the second stage of the impact energy of acoustic oscillations the solution is dehydrated by 20-50% in the vacuum drying emitting water condensate.

The essence of the method lies in the fact that the colloidal solutions are microheterogeneous system in which the energy expended in the process of emulsification, distributed in the form of the free surface energy on the globules. Condition destabilization of the dispersed system is to reduce the surface section of discrete phases that can be achieved is with the increase of the size of suspended particles. Vibroacoustic treatment of colloidal solutions, at least two sources of oscillations, emitting acoustic waves in ranges, respectively (1-18) kHz and (80-400) Hz, translates colloidal and dissolved substances in category weighted for certain separated from the dispersion medium. For each polydisperse solution the choice of the frequency of acoustic oscillations of the above ranges is set experimentally based on the physico-chemical properties of the dispersed phase and dispersion medium.

Below is an example of the method in the process of waste disposal spirit bards, centrate which is a combination of colloidal solution.

The method is as follows.

The original bard at a temperature of 90-100°C is subjected to a preliminary separation of the solid fraction with a selection of cake and the liquid fraction in the supernatant. Separator can be used, the system self-cleaning filters or decanter cleaning of effluents to 0.1 mm From the separator centrate served in a vacuum system where it removes the volatile aromatic substances and eliminate them in the collection of condensate surfactant, which may be implemented, for example, in medicine and the pharmaceutical industry. Removal of surfactants leads to the reduction of surface tension forces of the colloid to the of mponents and destabilization of the dispersed phase of supernatant.

Next, the centrate is directed to the first stage of coagulation in hydrodynamic installation with a vibrator configured for the emission of two frequencies in the acoustic range, respectively, f11=2 kHz, f21=120 Hz. Frequency f11established experimentally from the conditions for impact attenuation of surface tension of colloidal particles of amino acids and nitrogen in the dissolved form, the second frequency - amplitude increase their linear oscillations, increasing the probability of contact between them, merger, consolidation. As a result, after the first stage of the vibro-acoustic treatment in selected modes of colloidal and soluble substances are coagulated and the centrate is converted in an inhomogeneous dispersion system with the size of the suspended particles of 50-100 μm, i.e. suspension.

Before the second stage of vibroacoustic treatment for improving the efficiency of the coagulation process perform vacuum drying the resulting suspension with a selection of moisture in the form of aqueous condensate and residue volatile aromatic substances, maintaining a vacuum in the vacuum system (-0,8)-(-0,9) ATM and temperature of supernatant 72-85°C. Water condensate is collected in the water collection. Simultaneously with the process of vacuum selection moisture in an amount up to 20-50% occur the phenomenon of agglomeration of particles of a disperse system of supernatant to a size of 100-200 microns.

After selecting the lags centrate sent to vibroacoustical processing in hydrodynamic installation with a vibrator, configured on the radiation frequency f12=1.8 kHz and f22=100 Hz, in which there is a further escalation of suspended particles of a disperse system of supernatant to the size of 200-400 microns.

Then comes the final stage of separation of supernatant with separation of the solid fraction in the protein product and the release of aqueous phase with a residual content of not more than 0.05-0.08 g/l of dispersed phase size of not more than 5 μm, which after antibacterial treatment can be used for technical purposes.

Thus, the claimed method allows you to implement a waste-free environmentally safe and cost-effective technology utilization spirit bards with obtaining such products utilization, as dry food for farm animals, a surfactant, and purified water for technical purposes.

The method of separation of polydisperse solution of alcohol stillage involving the coagulation of colloidal and dissolved substances dispersed phase and the subsequent separation of the solid fraction of the formed product from the solution with separation of the liquid fraction of the dispersed medium, characterized in that the coagulation of the dispersed phase is carried out in two stages impact on the solution of the energy of acoustic waves, at least two spectra, respectively, in the range of 1-18 kHz, providing attenuation of surface tension, h is STIC colloidal and dissolved substances, and the range of 80-400 Hz, providing an increase in the oscillation amplitude, while before coagulation of the dispersed phase from the solution by vacuum emit volatile aromatic substances in the form of condensate, and before the second stage of the impact energy of acoustic oscillations the solution is dehydrated by 20-50% in the vacuum drying with allocation of water condensate.



 

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