SU1544713A1 - Method of recovering sericin from process fluid - Google Patents

Abstract

The invention relates to the technology of obtaining natural silk and is intended for the purification of process waters from coconut production from sericin. The purpose of the invention is to increase the recovery rate of sericin without altering its biochemical properties. To do this, prior to vacuum filtration, the liquid is pretreated in the cathode chamber of a diaphragm electrolyzer using a titanium cathode and a graphite anode at a current density of 30-150 A / m ²

the intensity of the electric effect is 800-1400 cells / l until the pH of the liquid reaches 7.5-10.5. Vacuum filtration is carried out with the simultaneous imposition of a constant electric field. 1 ill., 1 tab.

Description

The invention relates to the technology of obtaining natural silk and is intended for the purification of process waters from coconut production from sericin.

The purpose of the invention is to increase the recovery rate of sericin without altering its biochemical properties.

The drawing shows a diagram of the device that implements the method.

The device consists of a vacuum filter in the form of a drum 1, which is a porous cylinder of electrically conductive material that is resistant to electrochemical destruction during both anodic and cathodic polarization, covered with dielectric porous filter material 2. In the inner cavity of drum 1, vacuum pump 3 creates a vacuum. Drum 1 is immersed in

QM capacity 4 is for an electrical fluid lexno.io fluid that enters it from the cathode chamber by a diaphragm electrolyzer 5, the anode chamber of which is connected through the pump 6 to capacity 7 for a buffer fluid.

The drum body 1 and the capacitance 4 measure switch 8 are polar and are connected to the source 9 of direct current. The mechanical scraper 10 is designed to remove from the surface of the drum a dense cinnamon 11.

The process water, with the sieve solution dissolved in it, is supplied to the diaphragm electrolyzer 5. The leakage through the cathode chamber of the electrolyzer, the water is saturated with hydroxide ions. Reacts with ionized groups of sericin (NHL, COOH, SH, imidazolines and 1: birds)

about:

mi) due to the formation of hydrogen bonds by n, as well as with non-ionized h; ktkami poor modecouche sericin due to hypophobic taimo 1energy i and iroxidine I increase the negative negative charge of Sericin particles by Progürciont 1n ticking of sericin micelles

After treatment in the electrolyzer 5, the process water with the dissolved sericin is fed into the tank 4. The drum i, which is located in the capacitance 1 I and I, slowly rotates towards then the liquid Surface area of the filtering material 2, the speed of rotation of the drum 1, the speed of the post - laziness i: the thickness of the layer of technological fluid washing the filtering surface 2 ensures that the water of the tribe of the water and the filtering surface of the drum 1 contacts the linear volume of the elementary volume of water A durable particle (molecule, molecule aggregate) is found in an electric field during its stay in the tank 4 connected to the negative pole of the current source 9. On the surface of the spiral cable 1, connected to the positive source of the Yuka source, under a layer of filter material 2 electrochemical reaction of anodic decomposition of water occurs

On early contact of the filtering material with the bed during the gaimoimy of the negatively infused moles of sericin (sicellus) with idrokson, Koaiy 1 qi and flocculation of serinip (cella) with hydroxon ions occurs, accompanied by the formation of aipeiaros particles, Transforming holes in the feed material A crust of 1-1 sericin forms, which is further compacted and dehydrated; the action of fiddraeon forces generated by the rarefaction of the inside of drum 1, ui and the formation of a vacuum coherence) Since coagulation and aggregation of sericin particles occur ui due to the change in the conformation of the shells of the moss i n i by i-iroxioni ions, then serine, which forms corkch 11 on the surface of barags ,, for 1, not the juice of foreign chemical impurities and can ik with 1yova i s as quality) with personal feed additives in agriculture

When the drum J rotates, the compacted and dewatered crust 1 1 approaches the scraper 1 (1, which removes it from the surface of the fibrous material 2). To facilitate the cutting process and better clean the sericin crust 11, the adhesion adhesion forces are reduced. sericinic orbs with filtering material by applying an electric field of opposite directivity. For this, through the polarity switch 8, the capacitance 4 is connected.

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They are connected to the positive pole of the current source 9, and the drum 1 body to the negative. The electric field reduces adhesion and separates the sericin peel, because it has the direction

opposite to the one that caused its formation. Technological fluid, having passed through the container 4 and contacting each elementary volume with the surface of the filter of the second material 2, sericin is released and can be re-etched into the process of obtaining raw silk.

Example 10 l of process water with a sericin concentration of 0.47 g / l is subjected to electrochemical treatment in a cathode chamber of a flow-through diaphragm electrolyzer with a titanium cathode and graph | anode separated by an alundum diaphragm. The treatment is carried out at a current density of 20-170 A / m and an electrical effect intensity of 600-100 Cl / l until the pH of the water being treated is 7.5 10.5 units. At the same time, the specific energy consumption 1 , 7 kVg / m In the anode chamber of the electrolyzer, a solution of buffer liquid (auxiliary electrolyte) 10% Na2SO4 circulates, supplied by pump 6 from the tank 7

Sericin is purified from a vacuum drum filter model. The drum 1 is a graphite bushing with a diameter of 60 mm and a length of 70 mm, perforated through 3 mm holes with a diameter of 1.2 mm. As the filtering material 2, the polymer reverse membrane of the MFE-1 membrane is used. The rotation speed of the drum 1 is 0.3 rev. / min, the yukodvods to the graphite drum 2 are titanium structures and titanium contact points. As a vacuum pump 3, an ejector water laboratory pump is used.

The distance from the bottom of the container 4 to the filtering material 2 of the material is 1.5 mm. In case of evil, if the current density from current source 9 was within the range of 100-200, and the difference between the capacitances between the capacitor connected to the positive pole and the drum connected to the positive pole is 12 V, then on the filtering surface 2 sericin crust with a thickness of 0.15 mm, which is fully grown under a spring-loaded scraper. 10 At the same time, the current density of the opposite core is 300-400 Sericin content in purified water with given parameters 6-8 mg / l, i.e. purification rate is 98.7-98.3%. which is 2.9% higher than that of the prototype, with an average power consumption (including processing

E in the electrolyzer) 6,2 kVg-h / m

The table shows the dependence of the degree of wastewater treatment on the regime parameters of its pre-electroprocessing in the cathode chamber of the electrolyzer and the parameters of the electro-treated liquid.

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The limiting values of current density and amount of electricity are the limits of 30-150 A / m2 and 800-1400 C / L, respectively. When the current density is less than 30 A / m2 and the amount of electricity is less than 800 C / L in the electrophoresis sample, the amount of sericin does not change. With a value of 8 in water, there are practically no excess hydroxyl groups and a negative charge did not form on the surface of the sericin micelles. When, 5 or more sericin micelles become more mobile

With a density of more than 150 A / m2 and an intensity of more than 1400 C / l, that is, with an increase in pH of more than 10.5. The condition for water purification from sericin is somewhat deteriorated. This is due to the fact that, at a pH of more than 10.5, magnesium hydroxide begins to form, magnesium ions with hydroxyl groups form an insoluble suspension, which worsens the conditions for the interaction of sericin protein with hydroxyl groups, since magnesium ions take up their excess. In addition, at high current densities, negatively charged sericin micelles begin to migrate towards the anode and clog the diaphragm, thus, the regime parameters during the pre-electroprocessing of waste water in the cathode cell of the electrolyzer have a natural effect on the subsequent electrophoretic separation of sericin from the wastewater.

In the sericin electrophoresis mode, an increase in voltage above 12 V and a current density of more than 400 is undesirable, as this starts the electrochemical decomposition of wastewater substances and conformational amino acids of the sericin protein, which makes it unsuitable for use as a food additive.

Sericin peel on the surface of the filter material is not formed at all, if the process water is not exposed

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pre-cathodic oopaomxe in a motor-type teaser or if there is no short voltage across the drum .i capacitive m from current source 9. The sericin crust is suspended by a scraper K) if the current source oi does not supply voltage1 opposite direction

An increase in the intensive and (mubnnp.) Electrochemical recovery in an electric cell, current density in the zone of litter, 1 hp and peel off more than icx, in the example, a minimum of qualitative changes in cleaning. The cleaning speed of the wave aei. od hi. ko, much more unslichnnas; with power consumption. rashm. The described mode of operation of the cell is optimal.

The use of predoki aemoy stkiba Vol Volig reduce will reduce the consumption of oxen (about I and kokonomaniya and organization of the cycle of its use for sericin in the form of commodity) traffic jams: and agriculture

Formu.1I n; “) yrs i enk h

The method of regeneration of serptsian, chemical fluid, zlyuchayu.nnch nose filtering with precipitation of lepumbia on the filter material. (P.Sh pnodnis.ch so that, in order to increase the degree of sericin attraction, without changing its biochemical properties, before vacuum ({etc., it is carried out) |) processing fluid in the cathode chamber of the diaphiropic mennoro electrolyzer with titanium cathode and graphite anode at a current density of 30 1. () DL. electric impact of 800

1400 C / L until a pH of 7.5 10.5 is reached. and vacuum filtration is conducted with simultaneous application of a fixed electric field.

Technological Soda

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Claims (1)

Formula invented ι Enich A method of regenerating sericin from an ichnological liquid, comprising vacuum filtration with the deposition of sericin on a filter material, characterized in that that, in order to increase the degree of extraction of sericin without changing its biochemical properties, before vacuuming ({pre-treatment is carried out by preliminary treatment of the liquid in the cathode chamber of the diaphragm electrolyzer using a titanium cathode and a graphite anode at a current density of 30-150 A / m ² , the intensity of electrical exposure 801) 1400 C / l to achieve a liquid pH! and 7.5 10.5. and vacuum filtration of the Ved \ r with the simultaneous application of a constant electric field.