A subcritical extraction fluid precision filter system

Abstract

The utility model discloses a kind of subcritical extraction liquid precision filter systems, it is characterized in that, including PLC controller, filter body, hole plate is provided on the filter body, hole plate is divided into pure liquid cavity and mixed liquid cavity with filter body, metal filter stick is installed on the hole plate, and metal filter stick is in mixed liquid cavity;Mixed liquid outlet valve and fresh auxiliary import valve are installed on the pure liquid cavity;Mixed liquid import valve and slag outlet valve are installed on the mixed liquid cavity;Pressure sensor is installed in the pure liquid cavity and mixed liquid cavity, two pressure sensors are connected with differential pressure transmitter;The pressure transmitter, mixed liquid outlet valve, fresh auxiliary import valve, mixed liquid import valve and slag outlet valve are electrically connected with PLC controller.This filter system not only has good filtering effect, but also has the advantage of automatically running cleaning solid impurities, improves production efficiency.

Description

Technical Field

[0001] This utility model specifically relates to a precision filter system for subcritical extraction liquid, belonging to the technical field of subcritical extraction equipment. Background Technology

[0002] Subcritical extraction is a novel extraction and separation technology that uses a subcritical fluid as the extractant. Based on the principle of "like dissolves like," it transfers the fat-soluble components of a solid material to the extractant, and then separates the extractant from the target product through a vacuum evaporation process. For example, lutein can be obtained by subcritical extraction from marigolds. In the subcritical extraction process of marigold lutein, butane, propane, 134A, dimethyl ether, and liquid ammonia are mainly used as extraction aids. After extraction, solid-liquid separation is required. In the existing extraction process of marigold lutein, the solid-liquid separation of the mixture uses a combination of grid plates and filters, but the filtration effect is not ideal, and the solid impurities in the finished ointment often exceed the standard, causing difficulties for subsequent refining processes. At the same time, filter clogging often occurs during the solid-liquid separation process, requiring production to be interrupted for manual cleaning, resulting in low production efficiency. Summary of the Invention

[0003] In view of the problems existing in the prior art, this utility model provides a subcritical extract precision filter system, which aims to solve at least one of the problems of excessive solid impurities in finished oil paste and low efficiency of manual filter cleaning.

[0004] The technical solution of this utility model is as follows: A subcritical extractant precision filter system includes a PLC controller and a filter body. A perforated plate is provided on the filter body, dividing the interior into a purified liquid chamber and a mixed liquid chamber. A filter rod is mounted on the perforated plate, positioned within the mixed liquid chamber. The filter rod has an internal cavity and multiple filter holes connecting its cavity to the mixed liquid chamber. The cavity of the filter rod is also connected to the purified liquid chamber. A first valve and a second valve are installed in the purified liquid chamber. The first valve is the mixed liquid outlet valve, and the second valve is the fresh additive inlet valve. A third valve and a fourth valve are installed in the mixed liquid chamber. The third valve is the mixed liquid inlet valve, and the fourth valve is the slag outlet valve. All four valves are electrically controlled. Pressure sensors are installed in both the purified liquid chamber and the mixed liquid chamber, and both pressure sensors are connected to a differential pressure transmitter. The differential pressure transmitter, the first valve, the second valve, the third valve, and the fourth valve are all electrically connected to the PLC controller.

[0005] Furthermore, a sight glass is also provided on the outer shell of the mixing chamber.

[0006] Furthermore, the slag outlet valve is located at the bottom of the mixing chamber.

[0007] Furthermore, there are multiple filter rods, which are parallel and spaced apart and detachably mounted on the perforated plate.

[0008] Furthermore, the filter rod is a metal filter rod or a ceramic filter rod.

[0009] Furthermore, the metal filter rod is preferably a titanium rod.

[0010] Beneficial Effects: This invention utilizes multiple filter rods to filter solid impurities in the extracted mixture, serving as a fine filtration step after the initial coarse filtration process. It boasts a large filtration area; simultaneously, the filter rods have a high mesh size and can be customized to meet specific needs, resulting in excellent solid impurity filtration. When a certain amount of impurities accumulates on the surface of the metal filter rods, the pressure difference between the mixed liquid chamber and the clean liquid chamber increases. When the pressure difference reaches a set value, the pressure differential transmitter sends a cleaning signal to the PLC. The PLC then controls the fresh additive inlet valve to open, backwashing the metal filter rods, causing solid impurities to detach and be discharged from the slag outlet valve. Therefore, the subcritical extract precision filter system described in this invention not only provides excellent filtration but also features automatic solid impurity removal, improving production efficiency. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the composition and structure of a subcritical extractant precision filter system.

[0012] The diagram shows: 1. Mixed liquid outlet valve, 2. Fresh additive inlet valve, 3. Mixed liquid inlet valve, 4. Slag outlet valve, 5. Sight glass, 6. Differential pressure transmitter, 7. PLC controller, 8. Clean liquid chamber, 9. Orifice plate, 10. Metal filter rod, 11. Mixed liquid chamber. Detailed Implementation

[0013] The present invention will now be described in a clear and complete detail with reference to the accompanying drawings.

[0014] like Figure 1As shown, a subcritical extractant precision filter system comprises a filter body, a mixed liquid outlet valve 1, a fresh additive inlet valve 2, a mixed liquid inlet valve 3, a slag outlet valve 4, a sight glass 5, a differential pressure transmitter 6, and a PLC controller 7. The filter body is manufactured as a pressure vessel to withstand the required pressure. An orifice plate 9 is provided on the filter body, dividing it into a clean liquid chamber 8 and a mixed liquid chamber 11. Pressure gauges are connected to both the clean liquid chamber 8 and the mixed liquid chamber 11 to visually display the pressure within the chambers. Multiple filter rods 10 are installed parallel to each other on the orifice plate 9 (only one filter rod is shown schematically in the figure). The filter rod 10 is located in the mixed liquid chamber 11 and has an internal cavity. Multiple filter channels are provided on the filter rod, connecting the cavity of the filter rod to the mixed liquid chamber, and the cavity of the filter rod to the clean liquid chamber. In this example, the filter rod is made of titanium metal with a mesh size of 500 and a pore size of about 25 micrometers. The microporous titanium rod filter element is a porous filter material made of high-purity titanium powder through sintering. It has excellent corrosion resistance, high filtration accuracy and good mechanical strength.

[0015] The mixed liquid outlet valve 1 and the fresh additive inlet valve 2 are both installed on the clean liquid chamber 8; the mixed liquid inlet valve 3 and the slag outlet valve 4 are both installed on the mixed liquid chamber 11, with the slag outlet valve 4 located at the bottom of the mixed liquid chamber 11 for easy slag discharge. A sight glass 5 is also provided on the outer shell of the mixed liquid chamber 11 for easy observation of the internal condition of the mixed liquid chamber.

[0016] To achieve automated operation of filtration and slag discharge, pressure sensors are installed in both the clean liquid chamber 8 and the mixed liquid chamber 11. The two pressure sensors are connected to the differential pressure transmitter 6. The differential pressure transmitter 6, the mixed liquid outlet valve 1, the fresh additive inlet valve 2, the mixed liquid inlet valve 3, and the slag outlet valve 4 are all electrically connected to the PLC controller 7.

[0017] The following example, using subcritical extraction of marigold lutein, illustrates the working process of this invention.

[0018] First, marigold raw materials are added to a subcritical extraction device using butane, which is already in a subcritical state, as an extraction aid for extraction. After extraction, the mixture is coarsely filtered to obtain an extraction mixture, which still contains solid impurities. Next, the mixture is introduced into the filter mixing chamber 11 of this invention through the mixing inlet valve 3 and pressurized. Under pressure, the mixture is filtered through the metal filter rod 10 and enters the internal cavity of the metal filter rod. Solid substances are isolated outside the metal filter rod, while the liquid enters the interior of the metal filter rod 10 through microporous channels and converges into the clean liquid chamber 8, finally flowing out through the mixing outlet valve 1. When a certain thickness of solid impurities accumulates on the surface of the metal filter rod, it will hinder the liquid filtration speed, increasing the internal and external pressure difference (the pressure difference between the mixing chamber 11 and the clean liquid chamber 8). When a set value is reached, the differential pressure transmitter 6 sends an electrical signal to the PLC control system 7. The PLC control system 7 then issues a series of instructions: first, close valves 1 and 3; then, open valves 2 and 4; next, new additives are injected into the clean liquid chamber 8 through the fresh additive inlet valve 2, and then enter the metal filter rod 10 and are blown out through the channel. At this time, the filter residue attached to the surface of the metal filter rod 10 is blown off and flows out of the system through valve 4 for recycling. Then, valves 2 and 4 are closed, and valves 1 and 3 are opened to continue filtration. This process is repeated, allowing for automatic operation of the filtration and residue removal processes, significantly improving production efficiency. The mixed liquid after filtration by this precision filter system exits from the mixed liquid outlet valve 1 and enters the subsequent concentration and refining system. After concentration, the butane extraction additive is evaporated and recovered, and the remainder is lutein extract. Practice has proven that the lutein extract obtained after passing through the precision filter system described in this invention has significantly reduced solid impurities, resulting in a significant improvement in product quality.

[0019] Finally, it should be noted that the embodiments described above are merely some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

Claims

1. A subcritical extractant precision filter system, characterized in that, The filter includes a filter body, on which a perforated plate is provided, dividing the filter body into a clean liquid chamber and a mixed liquid chamber. A filter rod is installed on the perforated plate and is located in the mixed liquid chamber. A first valve and a second valve are installed on the clean liquid chamber. A third valve and a fourth valve are installed on the mixed liquid chamber. Pressure sensors are installed in both the clean liquid chamber and the mixed liquid chamber.

2. The subcritical extractant precision filter system according to claim 1, characterized in that, The filter system also includes a controller and a differential pressure transmitter, and the pressure sensor is connected to the differential pressure transmitter; the first valve, the second valve, the third valve, and the fourth valve are all electrically controlled valves; the differential pressure transmitter, the first valve, the second valve, the third valve, and the fourth valve are all electrically connected to the controller.

3. The subcritical extractant precision filter system according to claim 2, characterized in that, The controller is a PLC controller.

4. The subcritical extractant precision filter system according to claim 1, characterized in that, A sight glass is also provided on the outer shell of the mixing chamber.

5. A subcritical extractant precision filter system according to claim 1, characterized in that, The fourth valve is located at the bottom of the mixing chamber.

6. The subcritical extractant precision filter system according to claim 1, characterized in that, The filter rods are multiple in number and are detachably installed on the perforated plate with parallel spacing between them.

7. The subcritical extractant precision filter system according to claim 1, characterized in that, The filter rod is a metal filter rod or a ceramic filter rod.

8. A subcritical extractant precision filter system according to claim 7, characterized in that, The metal filter rod is a titanium rod.

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