KR200391974Y1 - Mixer Settler - Google Patents

Abstract

The present invention relates to a "solvent extraction mixed separator" required for waste acid recovery.

Recently, a huge amount of waste acid is pouring in the industrial field and many technologies have been developed to deal with it.

However, they all had many problems with the disposal of waste acid.

The "solvent extraction mixed separator" according to the present invention can be configured at a relatively low price while increasing the efficiency of waste acid treatment, it is a device having a high economic efficiency.

In addition, the most effective way to extract and reuse the target components to be extracted and used.

Description

Mixing separator for solvent extraction {Mixer Settler}

The present invention relates to a novel separator for solvent extraction.

The existing mixed separation method is as follows.

1. Single stage equilibrium extraction

Put the vinegar and the original solvent into the extraction tank, add the additives, add enough stirring, mix, and then settle down to separate them into the extraction phase and the after-image phase. This is called batch extraction. At this time, it can be seen that the two phases have reached an equilibrium with each other.

Add the additive S [kg] to the raw material F [kg] whose concentration is x _F [mass fraction] and the mixture M [kg] whose concentration is X _M [mass fraction] is formed ( M = F + S ) If so, the mass balance equation for weight is:

Mx _M = ( F + S ) x _M = Fx _F (1-1)

This equation can be modified to obtain the concentration x _M and the amount S of the flocculant in the mixture M as follows.

After stirring the mixture M sufficiently, the mixture is divided into two liquid phases, the extraction phase E [kg] and the residual phase R [kg].

M = E + R (1-2)

If the concentrations of the weights in the extraction phase E and the residual weight R are x _E and x _R , respectively, the following mass balance is established for the weight.

Mx _M = Ex _E + Rx _R (1-3)

Extracting the residual image and the estimation will reach the equilibrium _E x and _R x is because both the end point of the corresponding line _{x E = y, x R =} x d

Mx _M = Ey + Rx (1-4)

When M is eliminated, the mass ratio of the extracted phase ( E ) and the residual phase ( R ) can be obtained as follows from the composition in the mixture, the extracted phase and the residual phase.

Figure 4 is a cross-sectional view of the stirring tower and pulsation tower of the mixed precipitater according to the present invention.

The relation between the ratios of the sides of the triangle R ₇ E ₇ J ₇ = xx _M : x _M -y to complete the equation.

2. Counter current multistage extraction

In the countercurrent multi-stage extraction Referring respect to liquid volume and composition of the extraction liquid and Chūzan liquid the input roneun material F [kg / h] as shown below with article 1, and supplies the chuje S [kg / h] to the N terminal of the last Send them countercurrent to each other.

The output roneun the last extract out the E ₁ [kg / h], the final balance weight comes into the stage N R _N [kg / h].

Total material balance (input = output)

F + S = R _N + E ₁ (2-1)

When this is, as the confluence of the flows of each input and output M

F + S = R _N + E ₁ = M (2-2)

Becomes The point M in the equation is a point on the connecting line between point F and point S and a point on the connecting line between point R _N and point E ₁ .

If you take the material balance for the entrance to each of the following stages,

About stage 1

F + E ₂ = R ₁ + E ₁ (2-3)

Or, F - E ₁ = R ₁ - E ₂ (2-3-1)

About two steps

R ₁ + E ₃ = R ₂ + E ₂ (2-4)

Or, R ₁ - E ₂ = R ₂ - E ₃ (2-4-1)

m stage

R _m-1 + E _{m + 1} = R _m + E _m (2-5)

About N stage

R _N-1 + S = R _N + E _N (2-6)

Becomes

F - E ₁ = R ₁ - E ₂ = R ₂ - E ₃ =... = R _m - E _{m + 1} =... = R _N - S = D (2-7)

Points F and E _1, R ₁ and E _2, R ₂ and E _3, ... … , R _m and E _{m + 1} ,... … , The line connecting R _N and S all goes through one point D , which is called the operating point.

3. Cross current multistage extraction

Continuous batch extraction is cocurrent multistage extraction. That is, in Fig. 2, the operation of extracting by supplying the _{first addition} balance ( R ₁ ) to the second article and adding a new additive S ₂ to it is repeated.

In the case of co-current N- stage extraction as shown in the figure above, the final concentrations of the extracts and the fusiforms can be determined by triangulation and equilibrium curves.

(1) the use of a triangular diagram

For Article 1 in Figure 2, when adding S ₁ [kg] to the F ration [kg], the composition of the entire mixture is represented by M ₁ in Figure 3. Point M ₁ is inside the solubility curve, so it is separated after extraction-settling into the extraction phase ( E ₁ ) and the residual phase ( R ₁ ).

The composition of the whole mixed solution at the time of sending the residual image ( R ₁ ) to the next stage and adding S ₂ [kg] is M ₂ . Since M ₂ is also inside the solubility curve, the mixture is separated into the extraction phase ( E ₂ ) and the residual phase ( R ₂ ) after stirring. In the same manner, E ₃ and R ₃ are obtained.

Total material balance for Article m

R _m-1 + S _m = M _m = E _m + R _m (3-1)

Chuje (S _m) in the chujil If it does not contain at all the mass balance for the chujil

Formulas (3-5) are obtained from (3-3) and (3-4).

(2). How to calculate the number of extractions (theoretical stage number) n and the final concentration x _n , y _n when the additive ( S ) and the original solvent ( A ) do not dissolve at all

In the extraction phase, there are only the retardation and the flotation. In this case, the x and y coordinates of the equilibrium distribution curve x ' and y' are defined as follows. However, x and y are the composition of the quality in the afterimage and extraction phase, respectively.

y ' ₁ , y' ₂ ,... Suppose that y ' _n is 1 , 2 , ..., and n sets, respectively, the concentration of the floss in the extraction phase after the extraction operation, and y _'s is the concentration of the floss originally introduced during the extraction.

In Figure 3-11, the mass balance for extraction by Article 1 is

Ax _F ' + S ₁ y _s ' = A ₁ x ₁ ' + S ₁ y ₁ ' (3-6)

Since A and S do not dissolve each other, A enters the next tank (Article 2) as A ₁ . That is, A = A ₁ .

Since A and S do not dissolve each other, A _n-1 is all A _n and enters the next tank. That is, A _m = A _m

therefore,

This is the set of the n-th operation line - has a slope of (A / S ₁₎ is used to obtain the y _'n.

When the elimination is pure, remove y ' _s from the equation. Point 1 where the equilibrium curve defined by x ' , y' and the horizontal line represented by y '= y' _s meet the equilibrium curve by drawing a straight line of slope-( A / S ₁ ) starting at point x ' _F in Figure 4 Draw a straight line at x to find x ' ₁ . At point 2 where the vertical line meets the horizontal line y ' = y' _s , draw a straight line with the slope-( A / S ₂ ) to find the point 3 where the equilibrium curve meets. Constructed as above, repeated by x ground point x _'4 is determined to be smaller, the value of' _n than x 'stops the construction. At this time, the concentration of quality in the goblet that comes out of the last stage of co-current multistage extraction is lower than our target value, and the theoretical number is 4 stages.

If the removal is pure ( y ' _s = 0) and the amount of removal is equal in each _pair (i.e. S ₁ = S ₂ = …… = S _n = S ), the slope of the operating line in Figure 4 is the same and parallel to each other. .

Also, if the equilibrium line is given as a straight line,

y ' = mx' (3-8)

If y ' ₁ = mx' ₁ and assign it to the equation, the result is given by using y ' _s = 0.

Similarly, substituting and arranging,

In other words,

Is displayed. The formula has the form of ignition sequence, and when used, the residual ratio for the n- group extraction in the co-current multi-stage extraction operation (the concentration of the floc after the n- group extraction / the concentration of the floc in the stream) can be obtained as follows.

In this case, if the residual rate is determined without drawing, as shown in Fig. 4, the necessary number n can be obtained by calculation.

Therefore, the technical problem to be achieved by the present invention is to provide a new "solvent extraction mixing separator" that is easy to manufacture, economical, convenient to use and easy to maintain the equipment by overcoming the various problems as described above. .

"Solvent extraction mixer separator" according to the present invention is a separate mixing tank and sedimentation tank. Mixing is usually done using a mechanical stirrer, but mixing may also occur by pumping one or two liquids through a nozzle or tube. Phase separation in the settling tank is generally caused by gravity, but in the case of liquids that are easily emulsified and of similar density, the glass fibers at the outlet of the mixing tank to bond small droplets in the dispersion phase before gravity settling is performed. It must pass through a pad or screen. Since the mixed settler generally has high mass transfer efficiency, it is possible to design a highly reliable device using only the equilibrium analysis method based on the equilibrium data of the system without the mass transfer data.

The picket wall solves the shortcomings of the spray tower where only one drop of liquid is produced and dissipated. The disperse phase flows through the holes in the rectifier wall and the lower part of the next rectifier wall (for liquids with a low specific gravity). Or in the upper part (for liquids with a high specific gravity). The liquid in the dispersed phase thus collected is redispersed by the rectifying wall. Since the stage is made of rectifying walls, it is effective to reduce back mixing. The flow of liquid flows through the rectifying wall relatively fast, preventing emulsify.

The rectifying wall is zigzag and made in multiple stages. The pores are usually manufactured from 2mm to 3mm but can be changed to a suitable size according to the processing capacity.

The impeller uses gravity to mix the two liquid phases. Mechanical energy is supplied to an agitator with a rotating shaft. The distance between the stir blades is 1 to 2 feet, which causes a lot of contact in a short column. The extraction stirrer (impeller) can use various plastic materials such as P.P. material, P.E.material, FRP material, PVC material, etc.Teflon coating can be used with a thickness of 1-2mm on stainless steel to improve durability.

Layered water phases and organic phases that pass through a pocket pense reach a height-adjustable barrier. The defense wall has a groove of about 2mm ~ 3mm, and the water passes through this part. The organic phase beyond the upper part of the primary defense wall exits through the tube behind the defense wall. The prime minister circulates internally through the tube beyond the barrier. As the water phase is internally circulated, the mixing ratio of the mixing tank is easily controlled, and the extracted water phase is extracted again, thereby increasing the efficiency of extracting the target component.

The "solvent extraction mixed separator" constructed by the above-described method has the advantage of being inexpensive and easy to manufacture.

It is also composed of a structure that can be extracted and reused most effectively.

Although the present invention has been described in detail only with respect to the embodiments described, it will be apparent to those skilled in the art that the present invention may be modified or changed within the spirit and scope of the present invention, and such modifications and changes are included in the appended claims of utility model registration. something to do.

1 is a plan view of a mixing separator according to the present invention.

Figure 2 is a cross-sectional view as seen from the side of the mixer according to the present invention.

3 is a cross-sectional view of an agitator (impeller) of the mixing separator according to the present invention.

Claims (1)

In the solvent extraction method, it consists of a mixing tank and a separation tank, and the mixing tank is installed with an impeller, and the separation tank is composed of a zigzag-type picker fence, a defensive wall, and an internal circulation pipe, so that the extraction of the target components is effective. "Solvent extraction mixing separator" consisting of a structure that can be made