Method for chitosane production

FIELD: organic chemistry.

SUBSTANCE: claimed method includes subsequent chitosane-containing raw material with non-polar liquefied gas, water, alkali, water, acid, water, alkali, and water to produce target product in form of solid residue, wherein in at least first extraction step pressure in reaction mixture is periodically released to provide extractant boiling, and than increased up to starting value.

EFFECT: method with reduced energy consumption.

 

The invention relates to technology chitosan production.

A method of producing chitosan, which provides the consistent extraction of chitin-containing raw material nonpolar liquefied gas in the field of ultrasonic vibrations at a constant pressure above atmospheric, which is discharged to atmosphere after the completion of this phase extraction, water, alkali, obtained by dispersion in water, liquid ammonia, water, acid, water, alkali and water to obtain the desired product as a solid residue (EN 2116314 C1, 27.07.1998).

The disadvantage of this method is the high energy intensity. The technical result of the invention is to reduce energy consumption.

This result is achieved in that in the method of production of chitosan, which provides the consistent extraction of chitin-containing raw material nonpolar liquefied gas, water, alkali, water, acid, water, alkali and water to obtain the desired product as a solid residue, according to the invention at least in the first stage of extraction pressure in the extraction mixture is periodically reset to the value that provides the lash of the extractant, and increase to its original value.

The method is implemented as follows,

Chitinous biological raw materials, for example the EP crustacean shells, sequentially extracted first nonpolar liquefied gas by well-known methods (Kasyanov GI and other Processing of plant raw material liquefied and compressed gases. - M.: Agroniiteipp, 1993 - 40 C.)and then with water, alkali, water, acid, water, alkali and water by well-known methods (EN 2000066 WITH, 07.09.1993) to obtain the target product as a solid residue. At least at first, and preferably at each stage of extraction pressure in the extraction mixture is periodically reset to the value that provides the lash of the extractant, and increase to its original value.

Initial pressure at each stage of extraction corresponds to the vapor pressure of the solvent at the temperature of the extraction mixture. The initial temperature of the extraction mixture corresponds recommended for each stage of the extraction according to the above sources of information. The frequency and quantity of discharge pressure is determined for each stage of extraction by well-known methods (Lomachinskiy VA high technology processing of vegetable raw materials. - M.: Russian technology, 1996, p.54-56).

Education each bubble of gas phase in the extraction mixture is accompanied by the creation of a shock wave that destroys the cellular structure of biological materials. As is known, the action of the shock wave slabeva is proportional to the square of the distance from the epicenter, that is, in this case from the place of formation of a bubble of the gas phase. When the discharge pressure of the solid phase particles in the extraction mixture serve as centers of vaporization, and most of the bubbles formed directly on the surface of the chitin-containing raw material. The processing of the extraction mixture introduced from the outside by ultrasonic vibrations, as provided in the first stage of extraction in the closest analogue, has a rather low efficiency due to low efficiency of ultrasonic emitters, scattering of ultrasound in the wall of the extraction vessel, the interaction of the input and reflected on the interfaces of the phases of ultrasonic waves in the extraction mixture. Creating shock waves in the liquid ammonia in the extraction mixture in the gas phase, as provided in the third stage extraction in the closest analogue is more effective than the introduction of external ultrasonic vibrations, However, the formation of bubbles of the gas phase in this case occurs at the surface of contact of water and ammonia, that is at some distance from the particles of the extracted raw materials, resulting in the closest analogue in comparison with the proposed method is guaranteed a large share of the energy costs of the destruction of the cell structure of chitin-containing raw material and obtaining hits is on, respectively.

It should be noted that the destruction of the cell structure of materials under the action of shock waves begins with minor changes, the speed and the depth of which is increasing with the accumulation of fatigue stresses in raw materials. The destruction of the cellular structure of the raw materials and the kinetics of extraction in this case is determined by the known laws (Vasenkov I. improving the technology of production and application of extracts of plant materials in the food industry. Dis. Ph.D.): VNIIKOP-Rossiter, 1996 - 42 C.). In this case, since the changes are irreversible, periodic reset and the pressure increase in the extraction mixture should be implemented at the first stage of extraction. When you reset and the pressure in the extraction mixture not only at first, but the later stages of the extraction process intensifies in comparison with the closest analogue from the stage of extraction, in addition to the first, where the next discharge and the pressure increase in the extraction mixture. The intensification of the process in this case is estimated by the known laws (Tyrsin Y.A. Intensification of hydrolysis in biotechnology and the food industry. Abstract of thesis. Dr.): MHAPP, 1993 - 54 C.).

Obtained according to the described technology product complies with THE 9289-026-4511441-01 and provided for their physico-chemical and sensory characteristics different from those obtained for the closest analogue to the values not exceed the errors of their determination.

Experiments have shown that the reduction of specific energy consumption in comparison with the closest analogue in the proposed method ranges from 23% to 4% when the discharge pressure only at the first stage and at all stages of extraction, respectively. At the same time, the manufacturing cycle may be equal to the closest analogue or reduced by 24% without sacrificing the quality of the target product with the same boundary conditions.

Thus, the proposed method allows to reduce the specific energy consumption, and possible ways of its implementation to further reduce the duration of the technological cycle.

Method for the production of chitosan, which provides the consistent extraction of chitin-containing raw material nonpolar liquefied gas, water, alkali, water, acid, water, alkali and water to obtain the desired product as a solid residue, characterized in that at least at the first stage of extraction pressure in the extraction mixture is periodically reset to the value that provides the lash of the extractant, and increase to its original value.



 

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