Membrane mixer with shearing effect

Abstract

The utility model discloses a membrane mixer with a shearing effect. The membrane mixer comprises a tube shell, a tubular membrane is arranged on the inner side of the tube shell in a sleeving manner; a shell pass is formed between the outer side of the tubular membrane and the tube shell, and the inner side of the tubular membrane is a tube pass; a spiral flow deflector is arranged in the tube pass; a material B feeding hole is formed in the middle of the outer side of the tube shell; the head and tail ends of the tube shell and the tubular membrane are sealed by tube plates; and the head and tail ends of the tube pass are respectively provided with a material A feed port and a mixture discharge port. According to the membrane mixer with the shearing function, the mixing effect of multiphase materials is good, particularly, the materials input in the radial direction can be gradually and uniformly dispersed into the materials input in the axial direction in the axial direction, the pressure drop is small, the energy consumption is low, the structure is simple, the cost is low, and the membrane mixer is suitable for industrial production.

Description

TECHNICAL FIELD

[0001] The utility model relates to a membrane mixer, concretely relates to a membrane mixer with shearing action. BACKGROUND

[0002] In chemical, environmental protection, biology, pharmaceutical and many other industrial fields, the efficient mixing and mass transfer of multiphase materials (such as liquid-liquid, gas-liquid, liquid-solid, etc.) are the core unit operations, and their efficiency directly determines the reaction rate, product quality and energy consumption level.

[0003] At present, the mainstream technology for realizing the mixing of multiphase materials mainly includes two categories: mechanical stirring mixer and static mixer. The mechanical stirring mixer sets stirring blades in the container to realize the mixing of materials by using the shearing force and overall circulation provided by mechanical rotation. The static mixer sets fixed disturbance elements in the pipeline to realize mixing by continuously dividing, rotating and recombining the fluid in the flow process. However, the above two types of mixers have certain limitations. Among them, the mechanical stirring mixer relies on macroscopic circulation and turbulence, and the mixing scale is large, so it is difficult to realize rapid micro-mixing, and the mass transfer efficiency is limited, so its mixing efficiency is low. Moreover, the mechanical stirring mixer has high energy consumption and needs high speed, resulting in huge energy consumption, and there is a "mixing dead zone". The ordinary static mixer has the following shortcomings: 1) strong dependence on flow rate: the mixing effect is seriously dependent on the inlet flow rate, and the mixing effect decreases significantly at low flow rate; 2) easy to block: when processing solid particles or materials prone to crystallization and viscosity, the internal flow channel is easy to block, and it is difficult to clean and maintain; 3) limited shearing force: mainly relies on the division and recombination of fluid, and has limited ability for systems that require high shearing force to break up droplets or enhance mass transfer; 4) unable to realize the step-by-step and uniform addition and dispersion of radial input materials into axial input materials, and for some rapid reaction material systems, it cannot solve the problem of low reaction conversion rate and selectivity caused by the local high concentration of radial input materials.

[0004] Tubular membrane is a new technology to make membrane mixer due to its large specific surface area and precise dispersion characteristics. However, the traditional membrane mixer has inherent limitations: 1) the membrane surface is prone to form gel layer or filter cake layer due to concentration polarization and particle deposition, and the particulate impurities in the radial input material can easily block the micropores in the tubular membrane when passing through the membrane, resulting in a sharp decline in membrane flux, a decrease in mixing efficiency, and the need for frequent offline chemical cleaning, affecting the stability and economy of the mixing process; 2) the flow state of the axial input material in the membrane mixer is poor, the shear effect is weak, the convective mass transfer effect is poor, especially the membrane surface flow velocity on the inner wall of the tubular membrane is low and forms a laminar flow layer with poor convective mass transfer efficiency, which is not conducive to the radial mixing and dispersion of multi-phase materials. Therefore, how to effectively solve the membrane pollution problem in the membrane mixer, maintain its long-term, efficient and stable mixing performance, and solve the poor shear effect in the membrane mixer and improve the radial mixing and dispersion effect are the keys to promote the technology to industrial application.

[0005] Therefore, it is urgent to find a membrane mixer with shear effect which has good mixing effect between multi-phase materials, especially the radially input material can be gradually and uniformly dispersed into the axially input material, has small pressure drop, low energy consumption, simple structure, low cost and is suitable for industrial production. Practical new type content

[0006] The technical problem to be solved by the utility model is to overcome the above-mentioned defects existing in the prior art, provide a membrane mixer with shear effect which has good mixing effect between multi-phase materials, especially the radially input material can be gradually and uniformly dispersed into the axially input material, has small pressure drop, low energy consumption, simple structure, low cost and is suitable for industrial production.

[0007] The utility model adopts the technical scheme in the following: a membrane mixer with shear effect, including pipe shell, the inside of pipe shell is equipped with tubular membrane, the outside of tubular membrane and pipe shell form shell side, and the inside of tubular membrane is pipe side, be equipped with helical guide vane in the pipe side, the middle part of the outside of pipe shell is equipped with material B feed inlet, the first end of pipe shell and tubular membrane is sealed by pipe plate, and each of the first end of pipe side is equipped with material A feed inlet and mixture discharge port.

[0008] The principle of the membrane mixer with shearing action is that: the radially input material B penetrates into the axially input material A in the form of micro liquid drops under the action of the micro hole structure on the surface of the tubular membrane under the action of certain pressure, and is mixed under the shearing and turbulent action of the guide vane, the material B is gradually and uniformly added and dispersed to the material A in the radial direction, so that the material A and the material B are uniformly mixed in the axial and radial directions, and the instantaneous concentration peak of the material B is greatly reduced.

[0009] The working process of the membrane mixer with shearing action is as follows: the material A is sent into the membrane mixer from the material A feeding port, and the material B is sent into the membrane mixer through the material B feeding port in the middle of the outer side of the shell, the material B penetrates the micro hole structure in the tubular membrane under the action of pressure, and after forming micro liquid drops or micro bubbles, the material B is mixed with the mixed liquid or raw material liquid in the tubular membrane, and under the shearing or rotating action of the spiral guide vane in the tubular membrane, the material B is further mixed and then flows out from the mixture outlet at the tail end of the tubular membrane.

[0010] Preferably, the spiral guide vane comprises a split and recombination type guide vane.

[0011] Preferably, the split and recombination type guide vane comprises an SV, SK, SX, SH or SL type guide vane. More preferably, the spiral guide vane is an SK type guide vane. The tubular membrane is provided with a guide vane, which can improve the flow velocity of the membrane surface and the shearing strength of the material to be mixed, so that the material B penetrating through the membrane hole is quickly dispersed into the main body of the material A, and a very high mixing uniformity is achieved.

[0012] Preferably, one end of the spiral guide vane is connected with a rotating shaft controlled by a motor. The rotation of the rotating shaft driven by the motor can realize the rotation of the guide vane.

[0013] Preferably, the cross section of the tubular membrane comprises a circular, square, trapezoidal, triangular, hexagonal or octagonal tube, etc.

[0014] Preferably, the tubular membrane comprises a single-channel or multi-channel microporous membrane. The single-channel or multi-channel microporous membrane can cut the material B entering from the shell into small liquid drops when the material B passes through the micropore, so that the material B is quickly and uniformly dispersed with other materials. In addition, the multi-channel microporous membrane relies on multiple differentiated channels in the membrane body to realize the synchronous dispersion of different material phases and different properties of raw materials.

[0015] Preferably, the pore size of the microporous membrane is 1nm-1000μm.

[0016] Preferably, the microporous membrane comprises one or more of a composite membrane of a metal membrane, a metal mesh, a metal felt, a ceramic membrane, a porous ceramic tube, a polymer filter, or an organic membrane, and the like. More preferably, the microporous membrane comprises a metal membrane, a ceramic membrane, or a composite membrane thereof, and the like. Still more preferably, the microporous membrane comprises a ceramic membrane of alumina or silicon carbide, and the like.

[0017] Preferably, the inner wall of the tube passage of the tubular membrane is coated with a wear-resistant coating. The wear-resistant coating can improve wear resistance and increase service life.

[0018] Preferably, the composition of the wear-resistant coating comprises one or more of alumina, titania, tungsten carbide, silicon carbide, chromium oxide, or zirconium oxide, and the like.

[0019] Preferably, a wetting-modification coating is further coated on the wear-resistant coating.

[0020] Preferably, the wetting-modification coating comprises a hydrophilic coating or a hydrophobic coating. When the membrane mixer is used for gas-liquid mixing, the liquid-phase material is fed as material A, if material A is a hydrophilic solution, a hydrophilic coating is coated, otherwise, a hydrophobic coating is coated; when the membrane mixer is used for liquid-liquid mixing, if the liquid-phase material B is a hydrophilic solution, a hydrophilic coating is coated, otherwise, a hydrophobic coating is coated.

[0021] Preferably, the composition of the hydrophilic coating comprises one or more of titania, silica, polyvinyl alcohol, polyvinylpyrrolidone, or polyethylene glycol, and the like.

[0022] Preferably, the composition of the hydrophobic coating comprises one or more of silane, siloxane, polydimethylsiloxane, polytetrafluoroethylene, or perfluoropolyether, and the like.

[0023] Preferably, a sonotrode for ultrasonic cleaning is further arranged between the tube shell and the tubular membrane. One end of the sonotrode is connected to a transducer of an ultrasonic cleaning device. When the reaction system is shut down for maintenance, the pressure drop becomes large, or the membrane mixing efficiency is reduced, the sonotrode can be used to apply ultrasonic waves to the membrane mixer to clean the tubular membrane.

[0024] Preferably, the sonotrode is arranged in parallel with the tubular membrane, and the length of the sonotrode is equal to the length of the tubular membrane.

[0025] Preferably, the number of the sonotrodes is 1-3.

[0026] The beneficial effects of the present utility model are as follows:

[0027] (1) The membrane mixer with shearing action has good mixing effect between multiphase materials, especially the radially input material can be gradually and uniformly dispersed into the axially input material, has small pressure drop, low energy consumption, simple structure, low cost, and is suitable for industrial production.

[0028] (2) The membrane mixer with shearing action can realize online ultrasonic cleaning and overcome the problem of membrane blockage. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is the overall structure schematic diagram of the membrane mixer with shearing action of embodiments 1-3 of the utility model;

[0030] Figure 2 is the cross-sectional structure schematic diagram of the tubular membrane in embodiment 1 of the utility model with shearing action (omitting spiral flow guide vane);

[0031] Figure 3 is the cross-sectional structure schematic diagram of the tubular membrane in embodiments 2 and 3 of the utility model with shearing action (omitting spiral flow guide vane). DETAILED DESCRIPTION

[0032] The utility model will be further described below in combination with embodiments and drawings.

[0033] Embodiment 1

[0034] As shown in Figure 1 , 2 A kind of membrane mixer with shearing action, including tube shell 1;The inside of the tube shell 1 is sleeved with tubular membrane 2;The shell side 3 is formed between the outside of the tubular membrane 2 and tube shell 1, and the inside of the tubular membrane 2 is tube side 4;SK type spiral flow guide vane 5 is equipped in the tube side 4;The middle part of the outside of the tube shell 1 is equipped with material B feed inlet 1-1;The first end and last end of the tube shell 1 and tubular membrane 2 are sealed by tube plate 1-2, and the first end and last end of the tube side 4 are equipped with material A feed inlet 2-1 and mixture discharge port 2-2;

[0035] One end of the SK type spiral flow guide vane 5 is connected with motor-controlled rotating shaft;

[0036] The tubular membrane 2 is single-channel alumina ceramic membrane with aperture 200nm and circular cross section;

[0037] Two vibration rods 6 for ultrasonic cleaning are arranged between the tube shell 1 and tubular membrane 2;The direction of the vibration rod 6 is parallel to the tubular membrane 2, and the length of the vibration rod 6 is equal to the length of the tubular membrane 2;One end of the vibration rod 6 is connected with the transducer of ultrasonic cleaning equipment from material A feed inlet 2-1.

[0038] The working process of the membrane mixer with shearing action is as follows: the membrane mixer is used for mixing of ammoxylization reaction materials, hydrogen peroxide is used as material B, and t-butyl alcohol, cyclohexanone and ammonia are used as material A; material A is sent into the membrane mixer from the material A feeding port 2-1, at the same time, material B is sent into the membrane mixer through the material B feeding port 1-1 in the middle of the outer side of the shell 1, and the microdroplets of material B are formed under the action of pressure and mixed with the mixed solution in the tubular membrane 2, and then the mixed solution is further mixed under the shearing or rotating action of the SK type spiral flow guide piece 5 in the tubular membrane 2 and then flows out from the mixed material outlet 2-2 at the tail end of the tubular membrane 2; when the reaction system is stopped for maintenance, the pressure drop is large or the membrane mixing efficiency is reduced, the ultrasonic wave can be applied to the membrane mixer through the vibration rod 6 to realize cleaning of the tubular membrane 2.

[0039] It is detected that, under the traditional process, compared with using the traditional membrane mixer, the amount of t-butyl alcohol is reduced by one order of magnitude; the stoichiometric ratio of H2O2 is ≤1.05, and the utilization rate is >98%; the conversion rate of cyclohexanone is kept at 99.93%, and the selectivity of cyclohexanone oxime is 99.95%. It is shown that, in the membrane mixer with shearing action, the mixing effect of hydrogen peroxide is good, the utilization rate is high, the conversion rate of cyclohexanone in the reaction is high, and the selectivity of cyclohexanone oxime is high.

[0040] Example 2

[0041] As shown in Figure 1 , 3 , the difference between the embodiment and example 1 is that the inner wall of the tube side 4 of the tubular membrane 2 is coated with an alumina wear-resistant coating 2-3, and the alumina wear-resistant coating 2-3 is further coated with a titanium dioxide wetting modification hydrophilic coating 2-4 because the material B hydrogen peroxide is a hydrophilic solution. The rest is the same as example 1.

[0042] The working process of the membrane mixer with shearing action is as follows: the same as example 1.

[0043] It is detected that, under the traditional process, compared with using the traditional membrane mixer, the amount of t-butyl alcohol is reduced by one order of magnitude; the stoichiometric ratio of H2O2 is ≤1.05, and the utilization rate is >98%; the conversion rate of cyclohexanone is kept at 99.94%, and the selectivity of cyclohexanone oxime is 99.95%. It is shown that, in the membrane mixer with shearing action, the mixing effect of hydrogen peroxide is good, the utilization rate is high, the conversion rate of cyclohexanone in the reaction is high, and the selectivity of cyclohexanone oxime is high.

[0044] Example 3

[0045] As shown in Figure 1 , 3As shown, the difference between the embodiment and embodiment 1 is only that the tubular membrane 2 is a single-channel 316L metal membrane with a pore size of 1 μm, the diameter of the metal membrane is 14 mm, and the length is 1.1 m; the inner wall of the tube side 4 of the tubular membrane 2 is coated with an alumina wear-resistant coating 2-3, and since the material B steam is in a gas phase and the catalytic cracking raw oil is hydrophobic as the material A, a polytetrafluoroethylene wetting modification hydrophobic coating 2-4 is further coated on the alumina wear-resistant coating 2-3. The rest is the same as in embodiment 1.

[0046] The working process of the membrane mixer with shearing action of the utility model is different from that of embodiment 1 only in that the membrane mixer is used for mixing steam and catalytic cracking raw oil, the steam is used as material B, and the catalytic cracking raw oil is used as material A; material B is sent into the membrane mixer through the material B feeding port 1-1 in the middle of the outer side of the shell 1, and material B passes through the microporous structure in the tubular membrane 2 under the action of pressure, mixes with the catalytic cracking raw oil in the tubular membrane 2 after forming micro-bubbles with a particle size of 0.1-1.0 mm. The rest is the same as in embodiment 1.

Claims

1. A membrane mixer with shearing action, characterized by: The application relates to a shell-and-tube membrane reactor, which comprises a shell, a tubular membrane arranged in the shell, a shell side formed between the tubular membrane and the shell, and a tube side formed in the tubular membrane; a spiral guide vane is arranged in the tube side; a material B feeding port is arranged in the middle of the shell; the first and last ends of the shell and the tubular membrane are sealed by a tube sheet, and a material A feeding port and a mixture discharging port are arranged at the first and last ends of the tube side.

2. The film mixer with shearing action of claim 1, wherein: The spiral guide vane comprises a split and recombined guide vane; the split and recombined guide vane comprises an SV, SK, SX, SH or SL type guide vane; one end of the spiral guide vane is connected with a rotating shaft controlled by a motor.

3. The film mixer with shearing action according to claim 1 or 2, characterized in that: The cross section of the tubular membrane comprises a circular, square, trapezoidal, triangular, hexagonal or octagonal tube; the tubular membrane comprises a single-channel or multi-channel microporous membrane; the pore size of the microporous membrane is 1 nm to 1000 mu m; the microporous membrane comprises a composite membrane of one or more of a metal membrane, a metal mesh, a metal felt, a ceramic membrane, a porous ceramic tube, a polymer filter core or an organic membrane.

4. The film mixer with shearing action according to claim 1 or 2, characterized in that: The inner wall of the tube side of the tubular membrane is coated with a wear-resistant coating; the components of the wear-resistant coating comprise one or more of alumina, titania, tungsten carbide, silicon carbide, chromium oxide or zirconium oxide; a wetting modification coating is further coated on the wear-resistant coating. The wetting modification coating comprises a hydrophilic coating or a hydrophobic coating; the components of the hydrophilic coating comprise one or more of titania, silica, polyvinyl alcohol, polyvinylpyrrolidone or polyethylene glycol; the components of the hydrophobic coating comprise one or more of silane, siloxane, polydimethylsiloxane, polytetrafluoroethylene or perfluoropolyether.

5. The film mixer with shearing action of claim 3, wherein: The inner wall of the tube side of the tubular membrane is coated with a wear-resistant coating; the components of the wear-resistant coating comprise one or more of alumina, titania, tungsten carbide, silicon carbide, chromium oxide or zirconium oxide; a wetting modification coating is further coated on the wear-resistant coating. The wetting modification coating comprises a hydrophilic coating or a hydrophobic coating; the components of the hydrophilic coating comprise one or more of titania, silica, polyvinyl alcohol, polyvinylpyrrolidone or polyethylene glycol; the components of the hydrophobic coating comprise one or more of silane, siloxane, polydimethylsiloxane, polytetrafluoroethylene or perfluoropolyether.

6. The film mixer with shearing action according to claim 1 or 2, wherein: A sonotrode for ultrasonic cleaning is further arranged between the shell and the tubular membrane; the direction in which the sonotrode is arranged is parallel to the tubular membrane, and the length of the sonotrode is equal to the length of the tubular membrane; the number of the sonotrodes is 1 to 3.

7. The film mixer with shearing action of claim 3, wherein: A sonotrode for ultrasonic cleaning is further arranged between the shell and the tubular membrane; the direction in which the sonotrode is arranged is parallel to the tubular membrane, and the length of the sonotrode is equal to the length of the tubular membrane; the number of the sonotrodes is 1 to 3.

8. The film mixer with shearing action of claim 4, wherein: A sonotrode for ultrasonic cleaning is further arranged between the shell and the tubular membrane; the direction in which the sonotrode is arranged is parallel to the tubular membrane, and the length of the sonotrode is equal to the length of the tubular membrane; the number of the sonotrodes is 1 to 3.

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