A degumming separation system and process

Abstract

The application discloses a soapstock desolventizing and separating system and process, which comprises a preheater, a steam jet mixer provided with a throat mixing cavity and an inclined suction hole, and a steam stripping tank provided with a segmented temperature control assembly and an asymmetric bottom cone. The mixer outlet is provided with a tangential and downward inclined compound bias angle, and the process steps comprise internal energy injection, spiral power feeding, gradient thermal power maintenance and gas-liquid separation and discharge. The application utilizes steam jet to realize instantaneous heat exchange and self-crushing of materials, establishes a spiral track through a downward inclined guide angle, makes the track of new and old materials staggered in spatial displacement to inhibit splashing foam, cooperates with the segmented temperature control to establish a thermal energy barrier at the upper part to prevent wall hanging, and protects the thermal sensitive quality of the materials at the lower part, so that the problems of efficient desolventizing and smooth discharging of high-viscosity soapstock under the condition of no mechanical stirring are solved.

Description

Technical Field

[0001] This invention relates to the field of soap residue desolventizing and separation, specifically to a soap residue desolventizing and separation system and process. Background Technology

[0002] In the vegetable oil refining process, soapstock, as a byproduct of the alkali refining and deacidification stage, contains a certain proportion of solvents to be recovered. Currently, the industry typically uses descaling technology to recover the solvents from soapstock. Existing technical solutions, such as the two-stage soapstock desolventizing system disclosed in Chinese patent CN104152272B, heat the material using a rapid steam heater and process it using a soapstock desolventizing tank in conjunction with a demister. In actual production, such solutions and traditional vertical descaling tanks still face the following specific technical bottlenecks when processing high-viscosity soapstock: First, there is a contradiction between desolvation motives and mixing effectiveness. For example, although CN104152272B uses a heater and circulating atomization, when dealing with extremely high-viscosity soap residue, it is difficult to achieve complete micron-level crushing of the material without high-intensity mechanical stirring. However, introducing a mechanical stirring shaft brings serious risks of dynamic seal leakage, which can easily lead to a decrease in vacuum level in a vacuum environment. Furthermore, the stirring blades are prone to material adhesion, resulting in a sharp increase in energy consumption and cleaning difficulties.

[0003] Secondly, there's the issue of foam accumulation and "Yefan" overflow. In the initial stages of solvent extraction, soap residue produces a large amount of pasty foam. Current technologies largely rely on chemical defoamers or mechanical demisters. However, in actual operation, if there's a lack of flow field guidance when the material enters the tank, simple tangential feeding can cause violent collisions and splashing of the fluid at the horizontal level of the inlet. This splashing, caused by chaotic kinetic energy, further induces foam accumulation, leading to soap residue entering the condensation system with the gaseous solvent, resulting in the "Yefan" phenomenon, causing equipment blockage and damage to solvent quality.

[0004] Finally, there is the balance between wall adhesion and coking / heat loss browning. Existing descaling tanks mostly use a single heat source or uniform heating throughout the tank. In actual operation, the feed zone absorbs a large amount of heat due to the instantaneous flash evaporation of the solvent. If heat compensation is insufficient, condensation and liquid return will occur on the wall, causing viscous soap residue to dry rapidly, adhere to the walls, and even coke. Meanwhile, soap residue that remains at the bottom of the tank for a longer period is highly susceptible to browning if exposed to the same high temperature for an extended period. Due to the lack of effective temperature gradient control and asymmetric unloading structures, traditional equipment struggles to achieve smooth discharge after eliminating mechanical scrapers. Therefore, how to achieve orderly flow guidance, precise temperature control, and completely solve the problems of overflow and wall adhesion in an empty tank structure is a pressing issue in this field. Summary of the Invention

[0005] The purpose of this invention is to provide a soap residue desolventizing and separation system and process to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides a soap residue desolventizing and separation system, the system comprising: Soap foot preheater is used to preheat the soap feet to be processed; A steam jet mixer has its feed end connected to the soap foot preheater and its power end connected to a pressure steam source. The internal flow channel of the steam jet mixer includes a contraction section, a throat, and a diffusion section. The throat is provided with a mixing chamber that communicates with the soap foot feed inlet, so that the pressure steam and the soap foot can directly collide in the throat and couple kinetic and thermal energy. The steam desiccant has an interior cavity without a mechanical stirring device. The upper side wall of the steam desiccant has a feed inlet, which is connected to the outlet of the steam jet mixer. The segmented temperature control assembly includes a high-temperature jacket and a constant-temperature jacket independently installed on the outer wall of the desiccant; and a vacuum mechanism connected to the gas phase outlet of the desiccant.

[0007] Furthermore, the outlet of the steam jet mixer has a compound feed deflection angle relative to the geometric axis of the desiccant.

[0008] Furthermore, the mixing chamber is an annular cavity disposed around the throat, and the throat has a plurality of suction holes on its wall that connect the annular cavity and the flow channel. The axis of the suction hole is inclined at an angle to the direction of steam flow in the flow channel.

[0009] Furthermore, the segmented temperature control component includes: The first heating zone: corresponding to the high-temperature jacket, is set in the upper and lower covering areas of the feed inlet of the descaling tank, and is used to maintain the temperature of the inner wall of the tank in the feed inlet area at more than 10°C above the boiling point of the solvent. The second heating zone: corresponding to the constant temperature jacket, is located in the lower part of the tank below the first heating zone, and is used to maintain the material's self-flow state and protect the material's heat-sensitive properties.

[0010] Furthermore, the bottom of the descaling tank is provided with an asymmetric conical collection chamber, and the constant temperature jacket extends to the outer periphery of the asymmetric conical collection chamber.

[0011] Furthermore, the composite feed deflection angle includes a horizontal tangential angle and a downward guide angle, wherein the downward guide angle is inclined at 15° to 30° relative to the horizontal plane of the desiccant.

[0012] A soap residue desolventizing and separation process includes the following steps: S1: Internal energy injection step: High-pressure steam is mixed with soap foot by the steam jet mixer at the throat, so that the solvent inside the soap foot absorbs the steam enthalpy under pressure and reaches a superheated state. S2: Spiral Power Feeding Step: Using the downward tilting guide angle, the mixed material is guided into the descaling tank in a spiral trajectory and spread on the inner wall of the tank to form a liquid film. The downward tilting momentum is used to achieve the displacement and offset of the new and old materials in the spatial trajectory to suppress splashing foam. S3: Gradient thermal maintenance step: By segmenting the control of the high-temperature jacket and the constant-temperature jacket, a decreasing temperature gradient is formed on the inner wall of the tank from top to bottom. In the upper part, a thermal barrier is used to prevent solvent condensation and adhesion to the wall. In the lower part, steady-state thermal compensation is used to maintain the downward sliding amount of the material and avoid browning of the soap foot. S4: Gas-liquid separation and discharge steps: Solvent gas converges towards the center of the tank and is extracted by the vacuum mechanism. The desolventized soap residue slides down the spiral path to the bottom and is discharged.

[0013] In the internal energy injection step, the distance from which the soap foot enters the throat through the suction hole is less than 300 mm, so as to achieve instantaneous heat exchange under high pressure.

[0014] In the spiral power feeding step, the jet kinetic energy generated at the outlet of the steam jet mixer causes the material to produce a scouring effect in the inner wall region corresponding to the high-temperature jacket.

[0015] In the gradient thermal maintenance step, the temperature of the heat transfer medium in the high-temperature jacket is controlled at 110°C-120°C, and the temperature of the heat transfer medium in the constant-temperature jacket is controlled at 85°C-95°C.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. Achieving efficient crushing without power by utilizing energy coupling at the throat of the flow channel: By setting an annular mixing chamber and an inclined suction hole at the throat of the steam jet mixer, high-pressure steam directly collides with the soap residue within an extremely short stroke of less than 300mm. This feature converts the kinetic energy of the steam into strong shear force, enabling the soap residue to achieve micron-level dispersion and reach a superheated energy accumulation state before entering the tank. Self-crushing is achieved by utilizing "internal energy explosion", effectively replacing mechanical stirring and improving mass transfer efficiency.

[0017] 2. By constructing a spiral flow field through a three-dimensional feed deflection angle, splashing and overflow are actively suppressed: A downward guide angle of 15° to 30°, combined with a horizontal tangential angle, guides the material to spread in a spiral trajectory. This geometric feature causes the newly entering high-speed jet to be displaced and staggered in axial height from the existing liquid film, avoiding splashing caused by fluid collision. This suppresses foam generation from a fluid dynamics perspective, fundamentally solving the potential overflow hazard of "Yuefan".

[0018] 3. Smooth unloading and quality protection are achieved through segmented thermal gradients and asymmetrical structures: The system independently sets high-temperature and constant-temperature heating zones. The high-temperature zone utilizes the "air cushion effect" generated by micro-evaporation to suppress wall adhesion, while the constant-temperature zone maintains fluidity and prevents browning. Combined with the asymmetrical conical bottom design with the center offset by 100mm-200mm at the bottom discharge port, the centripetal dead zone of rotation is broken, ensuring that high-viscosity materials can still smoothly converge and discharge without mechanical power assistance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram illustrating the working principle of a soap residue desolventizing and separation system and process described in this invention. Figure 2 This is a schematic diagram of the overall structure of the steam jet mixer of the present invention; Figure 3 This is a schematic diagram illustrating the working principle of steam jet mixing in this invention. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1-3 This invention provides a soap residue desolventizing and separation system and process, including, Example 1 This embodiment achieves continuous operation of material from "internal energy injection" to "spiral separation" and then to "gradient anti-sticking" through deep coupling of the power injection unit, the space separation unit and the thermal control unit.

[0022] In the power injection and pre-crushing stage (combining the functions of a mixer and a preheater), the soap residue to be processed is first heated to 70°C-90°C in a soap residue preheater to reduce its initial viscosity. Subsequently, the soap residue enters a steam jet mixer, which has an annular mixing chamber machined around its throat. On the contact wall between this mixing chamber and the throat, 12 suction holes with a diameter of 4mm are uniformly formed, with the hole axis inclined at 45° towards the outlet direction. The pressurized steam (0.4MPa-0.8MPa) from the power source experiences a sudden increase in velocity and generates localized negative pressure as it passes through the throat of the flow channel. At this point, the soap residue is forcibly introduced into the center of the flow channel through the suction holes, colliding directly with the supersonic steam. The kinetic energy of the steam shears and crushes the soap residue, and its enthalpy is converted into the internal energy of the soap residue droplets within a very short stroke, placing the solvent inside the droplets in a pressurized superheated state, accumulating explosive force for subsequent flash evaporation.

[0023] In the spatial flow guidance and path management stage (geometric connection between the mixer outlet and the tank inlet), the high-energy material, after jet mixing, enters the tank through the inlet on the side wall of the desiccant. The outlet pipe of the steam jet mixer is connected to the inlet of the desiccant via a flange. Its installation position adopts a composite layout of "tangential + downward tilt": the mixer's axis deviates from the tank's centerline to form tangential feeding, while simultaneously tilting downwards at 20° relative to the horizontal plane. After entering the tank, the material moves against the tank wall under the influence of tangential momentum and forms a spiral downward trajectory under the influence of the downward tilt angle. This three-dimensional motion trajectory ensures that the material injected in each revolution is displaced downwards by approximately 30cm-50cm in spatial height, thus separating the new and old materials in spatial phase and effectively suppressing the risks of mechanical splashing and overflow (overflow) caused by fluid collision.

[0024] During the thermal gradient and film renewal stage (dynamic integration of segmented temperature control components and inner wall flow field), as the material slides down the spiral trajectory, the segmented temperature control components ensure fluidity by altering the physical properties of the boundary layer. The outer wall of the descaling tank is fully welded with two physically isolated heating jackets. The high-temperature jacket covers the upper feed area of ​​the tank and the area 1.5 meters below it; the constant-temperature jacket covers the lower middle part of the tank and the bottom cone area.

[0025] Upper thermal barrier: The high-temperature jacket maintains the inner wall temperature at 115°C-125°C. The trace amount of solvent generated at the moment of liquid film contact vaporizes and forms an extremely thin "gas film" on the wall surface, reducing the molecular adhesion of soap residue to the metal surface.

[0026] Lower thermal equilibrium: The material flowing downwards with the spiral enters a temperature-controlled zone of 85°C-95°C, maintained by a constant-temperature jacket. At this point, the solvent has dissipated, and the material viscosity increases. This temperature gradient ensures that the soapstock maintains the necessary fluidity during aggregation, while avoiding thermal damage to the soapstock quality caused by high temperatures.

[0027] In the flash separation and continuous production stage (a system combining the vacuum mechanism and tank structure), the vacuum mechanism continuously maintains a negative pressure environment of -0.08MPa to -0.095MPa inside the tank through the gas phase outlet throughout the material descent process. A gas phase outlet is located at the center of the top of the tank, and an asymmetric conical contraction chamber with a 150mm eccentricity is located at the bottom. Since there is no stirring device inside the tank, the space is unobstructed. Centrifugal force drives the heavier soap residue to spiral down the wall, while the light component vapors generated by the explosion of the superheated solvent converge towards the tank axis and are drawn upwards. The soap residue reaching the bottom, guided by the residual rotational velocity and the asymmetric conical wall, breaks through the centripetal dead zone and slides directly into the discharge port, achieving continuous discharge without the complete elimination of mechanical stirring.

[0028] Example 2 The steam jet mixer (jet rod) is installed on the side wall of the descaling tank through specific spatial positioning, and the geometric relationship of its outlet position is as follows: The horizontal dimension of the "tangential deflection angle" ensures that the central axis of the steam jet mixer does not point to the center of the degassing tank, but is arranged tangentially to the circumference of the tank's cross-section.

[0029] Specific structure: The spray rod passes through the tank wall flange, and the distance between its outlet nozzle and the inner wall of the tank is maintained at 30mm-50mm. The axis forms a 90° angle with the radial direction.

[0030] Implementation effect: After the material is ejected, it is forced to change its linear trajectory to circular motion by the centripetal force provided by the tank wall. This high-speed rotation generates a strong centrifugal force (usually several times the acceleration due to gravity), which causes the heavy phase soapstock to quickly adhere to the tank wall to form a liquid film, while simultaneously squeezing the air bubbles encased in the liquid film towards the axis of the tank.

[0031] The "downward guide angle" in the vertical dimension is achieved by tilting the spray bar downward relative to the horizontal cross-section of the desiccant, based on the horizontal tangential direction.

[0032] Specific structure: The spray bar has a downward tilting angle relative to the horizontal mask. The angle is set between 15° and 30° (preferably 20°).

[0033] Implementation effect: This angle gives the material an initial vertical downward momentum component (vax=v⋅sinβ). Without this angle, the material would spin at the same horizontal height at the inlet, causing the newly injected high-energy material to collide with the rotating old material, resulting in violent fluid turbulence and splash foam; with the downward angle, the material exhibits a spiral downward trajectory with a defined pitch.

[0034] The collaborative working logic of compound deflection angles (path offset mechanism) involves the combined action of tangential deflection angle and downward deflection angle to construct an ordered three-dimensional spatial field: Spatial displacement offset: Due to the axial velocity generated by the downward tilt angle, the vertical height of the material will drop by a certain distance (i.e., pitch, usually controlled between 300mm and 500mm) for each rotation.

[0035] Orderly spreading: New feed material always falls diagonally above the previous material trajectory, forming a spreading pattern similar to a "spiral band". This trajectory management ensures uniform distribution of material on the inner wall of the tank, increases the surface area of ​​the liquid film, and thus significantly improves the flash evaporation rate of the solvent in a vacuum environment.

[0036] Active anti-wall scraping: The high-speed jet continuously washes the tank wall at a downward angle. This dynamic shearing action compensates for the lack of mechanical scrapers and achieves a "self-cleaning" effect on the inner wall by utilizing the fluid's own kinetic energy.

[0037] Example 3 The core of the "annular mixing chamber" and "inclined suction port" lies in utilizing the local negative pressure generated by the Venturi effect to achieve the non-powered suction and high-energy crushing and mixing of high-viscosity soap residue through the designed flow channel interface.

[0038] The following is a detailed explanation of the implementation of this feature: the microstructure and implementation method of the annular mixing chamber and suction port. Inside the steam jet mixer (jet rod), the initial mixing and energy exchange of materials are achieved through the following precision structure: The annular mixing chamber serves a pressure-stabilizing and distributing function. This mixing chamber is not a simple pipe opening, but rather a closed, annular space surrounding the throat, providing pressure relief and buffering. Specific structure: The cross-sectional area of ​​the annular chamber is designed to be 1.5 to 2 times the diameter of the soap feed pipe. After the soap enters the annular chamber from the feed inlet, the sudden expansion of the space slows the flow velocity, and the pressure tends to be uniform in the circumferential direction. Implementation effect: This "pressure equalization" design ensures that regardless of the direction from which the soap enters the jet bar, the instantaneous flow rate entering the flow channel through the suction port is completely symmetrical in the circumferential direction. This avoids steam jet deflection caused by uneven feeding, ensuring the stability of the mixer operation.

[0039] The arrayed layout of the suction holes connects the annular cavity and the throat of the flow channel, forming a matrix of finely machined suction holes. Specifically, 8 to 16 suction holes are evenly distributed circumferentially on the throat wall. To increase the shear frequency, the suction holes are typically arranged in a double-row, staggered, quincunx pattern. Hole diameter parameters: The diameter of a single suction hole is set between 3mm and 6mm. The selection of the hole diameter must be coordinated with the negative pressure generated by the steam jet to ensure that high-viscosity soap residue can be smoothly "pulled" into the high-speed steam flow without the aid of external pumping pressure.

[0040] The "tilted angle" design of the suction port axis is key to achieving efficient kinetic energy coupling. The central axis of the suction port is not perpendicular to the flow channel, but tilted along the steam flow direction. Specific structure: The angle α between the suction port axis and the steam flow direction is set between 30° and 60° (preferably 45°). Physical logic (momentum guidance): Reduced resistance: The tilted angle along the flow direction gives the soap droplet a forward initial velocity component upon entering the flow channel. This reduces the impact resistance of the soap droplet on the high-speed steam flow, preventing severe backflow turbulence at the throat. Enhanced shearing: The soap droplet enters the center of the steam jet at a 45° angle, forming a strong "oblique shear" with the steam. Within a contact time of less than 0.01 seconds, the soap droplet is torn and atomized. Heat exchange: The tilted angle lengthens the residence path of the soap droplet in the high-velocity region of the throat, increasing the contact area for heat exchange and ensuring that the solvent inside the soap droplet can instantly absorb sufficient steam enthalpy to reach the superheated state required for flash evaporation.

[0041] The implementation measures address wear resistance and the potential for material fouling due to high-speed fluid friction and the presence of fouling at the suction port: Material selection: The throat inner wall and suction port area are made of surface-hardened stainless steel (such as chrome-plated 316L or tungsten carbide bushings). Self-cleaning logic: The design ensures that the static pressure generated in the throat by the steam is much lower than the pressure in the annular cavity. When the pressure difference ΔP is maintained within a certain range, the high-speed jet continuously scours the orifice, preventing high-viscosity soap residue from remaining and coking at the orifice.

[0042] Implementation 4 This embodiment ensures the self-flowing discharge of high-viscosity soap residue without mechanical scraping by constructing a vertical temperature gradient on the outer wall of the descaling tank and using a geometrically deformed bottom cone.

[0043] The first heating zone (high temperature anti-sticking zone) implementation details: The high temperature jacket is vertically wrapped around the feed inlet, and its installation height is usually 1.0m-1.5m, covering the area from 0.3m above the feed inlet to 0.7m-1.2m below it.

[0044] Physical parameters and medium: Saturated steam at 0.2MPa-0.3MPa is introduced into the jacket. The temperature of the inner wall of the tank in this area is maintained at 110°C-120°C by adjusting the temperature control valve.

[0045] Physical Logic: Since the boiling point range of the solvents contained in the soap residue (such as solvent No. 6) is typically between 60°C and 90°C, the temperature of the inner wall of this section is set at least 10°C higher than the solvent's boiling point. When the spirally rotating liquid film contacts the wall surface, the solvent at the contact surface undergoes instantaneous, minute vaporization due to heat, and the resulting micro-pressure counteracts the liquid phase adhesion force of the soap residue. This physically reduces the retention of the liquid film in the initial stage of feeding, preventing the material from agglomerating near the feeding zone due to drastic kinetic energy decay.

[0046] Implementation details of the second heating zone (constant temperature gravity flow section): The constant temperature jacket is located below the first heating zone, extending downwards until it covers the bottom discharge flange. Physical parameters and medium: Hot water or low-pressure waste heat steam is circulated into the jacket. The temperature control logic locks the inner wall temperature at 85°C-95°C. Physical logic: At this stage, most of the solvent has been removed from the material, and the viscosity of the material increases. It mainly relies on gravity and residual kinetic energy to slide down. This temperature setting ensures that the soap residue is in a low-viscosity flow state, while avoiding excessively high inner wall temperatures (such as exceeding 130°C) that could cause browning or coking of the heat-sensitive components in the soap residue.

[0047] The continuous coverage of the constant temperature jacket prevents the material from solidifying and clogging due to a sudden drop in temperature as it slides towards the discharge port. 3. Construction details of the asymmetric conical collection chamber: The collection area at the bottom of the desalination tank abandons the traditional centrally symmetrical cone and adopts an eccentric conical structure. Geometric shape: The center line of the discharge port of the bottom cone is offset from the geometric axis of the tank by about 100mm-200mm (depending on the tank diameter). This makes the generatrix of the bottom cone present an asymmetric state with one side steep (almost vertical) and the other side gentle. Physical effect: After entering the bottom cone, the original rotation trajectory of the soap feet spiraling down the wall is blocked by the asymmetric wall geometry, preventing the formation of a static vortex in the center. Utilizing the combined force of the spiral residual velocity and gravity, the material generates an unbalanced lateral pressure on the irregular conical surface, thus converging directly towards the discharge port along the steep side, solving the problem of the dead zone accumulation of high-viscosity materials in the center of the cone.

[0048] The description of the composite feed deflection angle is achieved through the geometric calibration of the steam jet mixer (jet bar) mounting flange. The jet bar outlet has two dimensions of deflection angle compensation relative to the tank cross-section; Horizontal tangential angle: The axis of the spray bar coincides with the tangent of the circumference at the feed inlet.

[0049] Downward guide angle: The nozzle of the spray bar is tilted downward, and the angle θ with the horizontal plane is set between 15° and 30°.

[0050] Taking the installation angle of 20° as an example, the physical parameterization of the helical trajectory produces the following physical effects during system operation: Helical pitch control: The material moves at an initial velocity... Injected into the tank. Due to the downward angle, the material rotates once ( Simultaneously with the path, an axial displacement is generated. The staggered path design achieves this: For a tank with a diameter of 1.2m, the vertical height of the material decreases by approximately 1.3m with each rotation. This large-pitch helical trajectory ensures that the high-energy jet, after being ejected, quickly avoids the horizontal height of the inlet and lands on the already spread liquid film below. This effectively prevents newly ejected material from colliding with the rotating old material at the same height, avoiding fluid splashing caused by energy cancellation, thus suppressing foam generation without the use of defoamers.

[0051] Example 5 This embodiment describes the implementation path of the soap residue desolventizing and separation process. After the process starts, the soap residue, preheated to 75°C, enters the throat of the steam jet mixer through the suction port. Physical logic: From the time the material enters the annular mixing chamber to its collision with the central supersonic steam flow, the radial and axial mixing stroke is controlled within 300mm.

[0052] Specific implementation method: Utilizing the high-pressure enveloping environment at the throat (where the static pressure is low but the fluid dynamic pressure is extremely high), the enthalpy of high-pressure steam (0.6 MPa) is transferred to the soap droplets in an extremely short time (milliseconds). Due to the extremely short path, heat loss is minimized, and the solvent contained inside the soap droplets is rapidly heated to above 110°C. At this time, the material is constrained by the jet rod channel, and the solvent is in an energy-accumulating state of "superheated but not vaporized," providing the power for self-breakdown after entering the vacuum tank.

[0053] The material leaves the ejector outlet and enters the descaling tank with an initial velocity of 25m / s-35m / s.

[0054] Specific implementation method: Utilize the 20° downward tilt angle of the spray bar outlet to guide the material to spread in a spiral ribbon shape on the inner wall of the tank.

[0055] The scouring effect is achieved by the high-speed jet acting directly on the inner wall area covered by the high-temperature jacket. The shear kinetic energy generated by the jet not only thins the liquid film, but also uses momentum to create a continuous "dynamic scouring" effect on the inner wall, counteracting the adhesion of viscous soap residue when it first enters the tank.

[0056] Displacement staggered logic: Due to the downward momentum, the material generates longitudinal displacement during its rotational descent. Newly injected material is always positioned above the material in the previous cycle in terms of spatial trajectory. This orderly flow field structure avoids chaotic collisions of fluids at the inlet level, physically suppressing mechanical foaming caused by violent fluid impact.

[0057] As the material slides down the inner wall of the tank, it is controlled by the temperature gradient of the segmented jacket.

[0058] High-temperature barrier section implementation: Thermally conductive steam is introduced into the high-temperature jacket to control the inner wall temperature at 115°C. This temperature is higher than the solvent boiling point, forming an extremely thin vapor pad on the wall surface, maintaining an active surface renewal rate of the liquid film, and preventing the solvent from condensing back onto the wall surface, which would cause soap residue to dry and adhere to the wall.

[0059] Constant temperature steady state section implementation: When the material slides down to the lower part of the tank, the constant temperature jacket controls the wall temperature to drop to 90°C.

[0060] Results: At this point, most of the solvent has flash-evaporated and separated, causing a significant increase in material viscosity. Appropriate thermal compensation maintains the flowability of the soapstock (self-flowing state), while the temperature avoids the thermosensitive color change range of the soapstock, ensuring the final product's color and quality.

[0061] The final phase separation was completed under a vacuum maintained at -0.09 MPa.

[0062] Gas phase motion: The solvent vapor generated by the explosion converges towards the low-pressure area at the center of the swirling flow field, and enters the condensation system through the top pipe under the action of vacuum pull.

[0063] Liquid phase motion: After desolventizing, the soap residue slides into the asymmetric conical collection chamber at the bottom by gravity and residual spiral kinetic energy.

[0064] Implementation method: The asymmetrical bottom cone wall surface forcibly changes the circumferential motion direction of the soap foot, and uses the downward sliding amount of the material itself to break the symmetrical force balance, so that the material slides directly into the eccentric discharge port along the cone surface.

[0065] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A soap residue desolventizing and separation system, characterized in that, include: Soap foot preheater is used to preheat the soap feet to be processed; A steam jet mixer has its feed end connected to the soap foot preheater and its power end connected to a pressure steam source. The internal flow channel of the steam jet mixer includes a contraction section, a throat, and a diffusion section. The throat is provided with a mixing chamber that communicates with the soap foot feed inlet, so that the pressure steam and the soap foot can directly collide in the throat and couple kinetic and thermal energy. The steam desiccant has an interior cavity without a mechanical stirring device. The upper side wall of the steam desiccant has a feed inlet, which is connected to the outlet of the steam jet mixer. The segmented temperature control assembly includes a high-temperature jacket and a constant-temperature jacket independently installed on the outer wall of the desiccant; and a vacuum mechanism connected to the gas phase outlet of the desiccant.

2. The soap residue desolventizing and separation system according to claim 1, characterized in that: The outlet of the steam jet mixer has a compound feed angle relative to the geometric axis of the desiccant.

3. The soap residue desolventizing and separation system according to claim 1, characterized in that: The mixing chamber is an annular cavity located around the throat, and the throat has several suction holes on its wall that connect the annular cavity to the flow channel. The axis of the suction hole is inclined at an angle to the direction of steam flow in the flow channel.

4. The soap residue desolventizing and separation system according to claim 1, characterized in that: The segmented temperature control component includes: The first heating zone: corresponding to the high-temperature jacket, is set in the upper and lower covering areas of the feed inlet of the descaling tank, and is used to maintain the temperature of the inner wall of the tank in the feed inlet area at more than 10°C above the boiling point of the solvent. The second heating zone: corresponding to the constant temperature jacket, is located in the lower part of the tank below the first heating zone, and is used to maintain the material's self-flow state and protect the material's heat-sensitive properties.

5. The soap residue desolventizing and separation system according to claim 1, characterized in that: The bottom of the descaling tank is provided with an asymmetric conical collection chamber, and the constant temperature jacket extends to the outer periphery of the asymmetric conical collection chamber.

6. The soap residue desolventizing and separation system according to claim 2, characterized in that: The composite feed deflection angle includes a horizontal tangential angle and a downward guide angle, wherein the downward guide angle is inclined at 15° to 30° relative to the horizontal plane of the desiccant.

7. A soap residue desolventizing and separation process implemented using the system described in any one of claims 1-6, characterized in that, Includes the following steps: S1: Internal energy injection step: High-pressure steam is mixed with soap foot by the steam jet mixer at the throat, so that the solvent inside the soap foot absorbs the steam enthalpy under pressure and reaches a superheated state. S2: Spiral Power Feeding Step: Using the downward tilting guide angle, the mixed material is guided into the descaling tank in a spiral trajectory and spread on the inner wall of the tank to form a liquid film. The downward tilting momentum is used to achieve the displacement and offset of the new and old materials in the spatial trajectory to suppress splashing foam. S3: Gradient thermal maintenance step: By segmenting the control of the high-temperature jacket and the constant-temperature jacket, a decreasing temperature gradient is formed on the inner wall of the tank from top to bottom. In the upper part, a thermal barrier is used to prevent solvent condensation and adhesion to the wall. In the lower part, steady-state thermal compensation is used to maintain the downward sliding amount of the material and avoid browning of the soap foot. S4: Gas-liquid separation and discharge steps: Solvent gas converges towards the center of the tank and is extracted by the vacuum mechanism. The desolventized soap residue slides down the spiral path to the bottom and is discharged.

8. The soap residue desolventizing and separation process according to claim 7, characterized in that: In the internal energy injection step, the distance from which the soap foot enters the throat through the suction hole is less than 300 mm, so as to achieve instantaneous heat exchange under high pressure.

9. The soap residue desolventizing and separation process according to claim 7, characterized in that: In the spiral power feeding step, the jet kinetic energy generated at the outlet of the steam jet mixer causes the material to produce a scouring effect in the inner wall region corresponding to the high-temperature jacket.

10. The soap residue desolventizing and separation process according to claim 7, characterized in that: In the gradient thermal maintenance step, the temperature of the heat transfer medium in the high-temperature jacket is controlled at 110°C-120°C, and the temperature of the heat transfer medium in the constant-temperature jacket is controlled at 85°C-95°C.

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