Film vacuum concentration system and method

Abstract

The invention relates to a film vacuum concentration system and method. The system comprises a vacuum concentration tank body, a film concentrator, a steam heating pipe, a circulating pump and a preheating jacketed pipe, the film concentrator is arranged inside the vacuum concentration tank body; the steam heating pipe is arranged in the middle of the film concentrator; a vacuumizing pipe is arranged at the top of the vacuum concentration tank body, and a discharge hole is formed in the bottom of the vacuum concentration tank body; a preheating jacketed pipe and a circulating pump are sequentially arranged between the feeding hole of the film concentrator and the discharging hole of the vacuum concentration tank body; a valve II is arranged on a pipeline between the preheating jacketed pipe and the circulating pump; a raw material input pipe is arranged on one side of the pipeline between the valve II and the circulating pump, and a discharge pipe is arranged on the other side of the pipeline; a valve I is arranged on the raw material input pipe; and a valve III is arranged on the discharge pipe. The concentration treatment time can be effectively shortened, so that the concentration efficiency is improved, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of vacuum concentration technology, and in particular to a thin film vacuum concentration system and method. Background Art

[0002] Vacuum concentrators are a common type of concentrating equipment, often used for concentrating functional active ingredients. Currently, common vacuum concentrators include single-effect concentrators and falling-film concentrators. However, single-effect concentrators take too long and have low concentration efficiency, while falling-film concentrators are too tall and difficult to install. Summary of the Invention

[0003] In view of the above problems, the object of the present invention is to provide a thin film vacuum concentration system and method, which can effectively improve the concentration efficiency and is easy to install.

[0004] The technical solution adopted in the present invention is as follows:

[0005] The present invention proposes a thin film vacuum concentration system, comprising a vacuum concentration tank body, a thin film concentrator, a steam heating pipe, a circulation pump and a preheating jacket pipe; the thin film concentrator is arranged inside the vacuum concentration tank body; the steam heating pipe is arranged in the middle of the thin film concentrator, and its upper and lower ends respectively pass through the side walls of the vacuum concentration tank body; the top of the vacuum concentration tank body is provided with a vacuum pipe, and the bottom is provided with a discharge port; the output end of the preheating jacket pipe is connected to the input end of the thin film concentrator through a pipeline, and the input end is connected to the output end of the circulation pump through a pipeline; the input end of the circulation pump is connected to the discharge port through a pipeline; a valve II is provided on the pipeline between the preheating jacket pipe and the circulation pump; a raw material input pipe is provided on one side of the pipeline between the valve II and the circulation pump, and a discharge pipe is provided on the other side; a valve I is provided on the raw material input pipe; and a valve III is provided on the discharge pipe.

[0006] Furthermore, the film concentrator includes a liquid collecting tank and a film heating surface; the liquid collecting tank is arranged on the upper outer side of the steam heating tube, and an annular gap is formed between its center and the tube wall of the steam heating tube; the film heating surface is arranged below the liquid collecting tank, and the film heating surface is composed of a butterfly-shaped curved surface uniformly distributed longitudinally on the outside of the steam heating tube, and the interior of the film heating surface is connected to the steam heating tube.

[0007] Furthermore, a film thickness limiting ring is provided between two adjacent butterfly-shaped surfaces.

[0008] Furthermore, a gas-liquid separator is provided in front of the outer port of the vacuum tube; the bottom of the gas-liquid separator is connected to the vacuum concentration tank through a reflux pipe.

[0009] Furthermore, a feed port connected to the liquid collecting tank is provided on an upper portion of one side of the vacuum concentration tank body; the feed port is tangentially connected to the side wall of the liquid collecting tank.

[0010] A thin film vacuum concentration method comprises the following steps: opening valves I and II, closing valve III, connecting a vacuum pump, evacuating a vacuum concentration tank to a vacuum environment, and sucking a raw material liquid into the vacuum concentration tank through valve I; after feeding is completed, closing valve I, starting a circulation pump, and then connecting steam, so that the raw material liquid at the bottom of the vacuum concentration tank is pumped out by the circulation pump, heated to an evaporation temperature through a preheating jacket pipe, and tangentially enters a liquid collecting tank through a feed inlet for rotary flow, so that the evaporation surface of the raw material liquid is fully expanded, self-evaporation occurs, and preliminary concentration is achieved; the raw material liquid rotates from the periphery of the liquid collecting tank to the center, passes through an annular gap at the center of the liquid collecting tank, slides uniformly from all sides along a steam heating pipe to the surface of a thin film heating surface, forms a thin film, and continues to slide along the surface of the thin film heating surface. During the sliding process, the raw material liquid is heated and concentrated by the steam heating pipe inside the thin film heating surface, thereby achieving further concentration treatment; the concentrated raw material liquid flows to the bottom of the vacuum concentration tank and enters the next cycle of concentration treatment; after the concentration treatment is completed, the steam entry is closed, valves I and II are closed, and valve III is opened to transport and discharge the concentrated raw material liquid.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The present invention can effectively shorten the concentration process time, thereby improving concentration efficiency and reducing production costs. Therefore, the present invention can effectively improve the shortcomings of existing vacuum concentration equipment and is conducive to the development of concentration technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the overall structure of a thin film vacuum concentration system proposed by the present invention;

[0014] Figure 2 is a schematic diagram of the flow of concentrated liquid for film heating;

[0015] Figure 3 It is a schematic diagram of the flow of concentrate in the sump.

[0016] Among them, the figure markings are: 1-vacuum concentration tank body; 11-feed port; 12-vacuum pipe; 13-steam heating pipe; 14-discharge port; 2-membrane concentrator; 21-liquid collecting tank; 22-film heating surface; 23-film thickness limiting ring; 3-circulation pump; 4-preheating jacket pipe; 5-gas-liquid separator; 51-reflux pipe; 6-valve I; 7-valve II; 8-valve III. DETAILED DESCRIPTION

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] It should be noted that, in the description of the present invention, the terms "up", "down", "top", "bottom", "one side", "the other side", "left", "right", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not mean that the device or element must have a specific orientation, be constructed and operated in a specific orientation.

[0019] See attached Figure 1 The specific structure of an embodiment of a thin film vacuum concentration system proposed in the present invention is given. The system includes a vacuum concentration tank 1, a thin film concentrator 2, a steam heating pipe 13, a circulation pump 3 and a preheating jacket pipe 4.

[0020] Among them, the thin film concentrator 2 is arranged inside the vacuum concentration tank body 1; the steam heating pipe 13 is coaxially arranged in the middle of the thin film concentrator 2, and the upper and lower ends of the steam heating pipe 13 respectively pass through the side wall of the vacuum concentration tank body 1 horizontally, serving as the steam inlet and the steam condensate outlet respectively; the top of the vacuum concentration tank body 1 is provided with a vacuum pipe 12, and the bottom is provided with a discharge port 14.

[0021] The output end of the preheating jacketed tube 4 is connected to the input end of the membrane concentrator 2 through a pipeline, and the input end of the preheating jacketed tube 4 is connected to the output end of the circulation pump 3 through a pipeline; in this embodiment, the preheating jacketed tube 4 is a steam preheating jacketed tube, and a steam inlet is provided on one side of its upper part, and a steam condensate outlet is provided on the lower side.

[0022] The input end of the circulation pump 3 is connected to the discharge port 14 through a pipeline; a valve II7 is provided on the pipeline between the preheating jacket pipe 4 and the circulation pump 3; a raw material input pipe is provided on one side of the pipeline between the valve II7 and the circulation pump 3, and a discharge pipe is provided on the other side; a valve I6 is provided on the raw material input pipe; and a valve III8 is provided on the discharge pipe.

[0023] Specifically, the thin film concentrator includes a liquid collecting tank 21 and a thin film heating surface 22; the liquid collecting tank 21 is arranged on the upper outer side of the steam heating tube 13, and an annular gap is formed between its center and the tube wall of the steam heating tube 13; the thin film heating surface 22 is arranged below the liquid collecting tank 21, and the thin film heating surface 22 is composed of a plurality of butterfly-shaped curved surfaces uniformly distributed longitudinally on the outside of the steam heating tube 13. In this embodiment, the number of the butterfly-shaped curved surfaces is five, and the interior of the thin film heating surface 22 is connected to the steam heating tube 13; the butterfly-shaped curved surface can significantly increase the concentration and evaporation area compared to the flat heating surface.

[0024] The present invention designs the heating surface to be a curved heating surface, which can significantly increase the heating evaporation area compared with a flat heating surface, thereby achieving the purpose of enhancing the concentration efficiency and shortening the time.

[0025] In this embodiment, a film thickness limiting ring 23 is provided between two adjacent butterfly-shaped surfaces for forming a film and controlling the film thickness.

[0026] A feed port 11 connected to the liquid collecting tank 21 is provided on an upper portion of one side of the vacuum concentration tank body 1 ; the feed port 11 is tangentially connected to the side wall of the liquid collecting tank 21 .

[0027] A gas-liquid separator 5 is provided in front of the outer end of the vacuum tube 12; the bottom of the gas-liquid separator 5 is connected to the vacuum concentration tank 1 via a reflux pipe 51. The pre-positioned gas-liquid separator 5 is used to separate the liquid carried by the evaporated solvent and return it to the vacuum concentration tank 1 to avoid loss of the liquid.

[0028] The heating temperature of the steam and the vacuum degree in the tank can be adjusted according to different feed liquids and concentration processes; the film thickness can be adjusted by controlling the delivery volume of the circulating pump 3.

[0029] A thin film vacuum concentration method specifically comprises the following steps:

[0030] Open valve I6 and valve II7, close valve III8, connect the vacuum pipe 12, and pump the vacuum concentration tank body 1 into a vacuum environment. The raw material liquid is sucked into the vacuum concentration tank body 1 through valve I6; when the feeding is completed, close valve I6, start the circulation pump 3, and then connect the steam. The liquid at the bottom of the vacuum concentration tank body 1 is pumped out by the circulation pump 3, heated to the evaporation temperature through the preheating jacket pipe 4, and enters the collecting tank 21 tangentially through the feed port 11 for rotary flow. The evaporation surface of the liquid is fully expanded, self-evaporation occurs, and preliminary concentration is achieved; the liquid flows from the periphery of the collecting tank 21 to the bottom of the collecting tank 21. It rotates around the center, passes through the annular gap at the center of the liquid collecting tank 21, slides evenly from all sides along the steam heating tube 13 to the surface of the film heating surface 22, forms a thin film, and continues to slide along the surface of the film heating surface 22. During the sliding process, it is heated and concentrated by the steam heating tube 13 inside the film heating surface 22, realizing further concentration treatment; the concentrated liquid flows to the bottom of the vacuum concentration tank body 1 and enters the next cycle of concentration treatment; when the concentration treatment is completed, the steam entry is closed, the valve I6 and the valve II7 are closed, the valve III8 is opened, and the concentrated liquid is transported and discharged from the discharge pipe.

[0031] Matters not covered in the present invention are all known technologies.

[0032] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A thin film vacuum concentration system, characterized in that: The system includes a vacuum concentration tank body, a thin film concentrator, a steam heating pipe, a circulation pump and a preheating jacket pipe; the thin film concentrator is arranged inside the vacuum concentration tank body; the steam heating pipe is arranged in the middle of the thin film concentrator, and its upper and lower ends respectively pass through the side walls of the vacuum concentration tank body; the top of the vacuum concentration tank body is provided with a vacuum pipe, and the bottom is provided with a discharge port; the output end of the preheating jacket pipe is connected to the input end of the thin film concentrator through a pipeline, and the input end is connected to the output end of the circulation pump through a pipeline; the input end of the circulation pump is connected to the discharge port through a pipeline; a valve II is provided on the pipeline between the preheating jacket pipe and the circulation pump; a raw material input pipe is provided on one side of the pipeline between the valve II and the circulation pump, and a discharge pipe is provided on the other side; a valve I is provided on the raw material input pipe; a valve III is provided on the discharge pipe.

2. The thin film vacuum concentration system according to claim 1, characterized in that: The thin film concentrator includes a liquid collecting tank and a thin film heating surface; the liquid collecting tank is arranged on the upper outer side of the steam heating tube, and an annular gap is formed between its center and the tube wall of the steam heating tube; the thin film heating surface is arranged below the liquid collecting tank, and the thin film heating surface is composed of a butterfly-shaped curved surface uniformly distributed longitudinally on the outside of the steam heating tube, and the interior of the thin film heating surface is connected to the steam heating tube.

3. A thin film vacuum concentration system according to claim 2, characterized in that: A film thickness limiting ring is provided between two adjacent butterfly-shaped curved surfaces.

4. The thin film vacuum concentration system according to claim 1, characterized in that: A gas-liquid separator is provided in front of the outer port of the vacuum tube; the bottom of the gas-liquid separator is connected to the vacuum concentration tank through a reflux pipe.

5. The thin film vacuum concentration system according to claim 2, characterized in that: A feed port connected to the liquid collecting tank is provided on an upper portion of one side of the vacuum concentration tank body; the feed port is tangentially connected to the side wall of the liquid collecting tank.

6. A thin film vacuum concentration method, implemented using the thin film vacuum concentration system according to claim 5, characterized in that: The method comprises the following steps: opening valve I and valve II, closing valve III, connecting a vacuum pump, evacuating a vacuum concentration tank to a vacuum environment, and sucking the raw material liquid into the interior of the vacuum concentration tank through valve I; when feeding is completed, closing valve I, starting a circulation pump, and then connecting steam, the raw material liquid at the bottom of the vacuum concentration tank is pumped out by the circulation pump, heated to the evaporation temperature through a preheating jacket pipe, and tangentially enters a collecting tank through a feed port for rotary flow, so that the evaporation surface of the raw material liquid is fully expanded, self-evaporation occurs, and preliminary concentration is achieved; the raw material liquid rotates from the periphery of the collecting tank to the center, passes through an annular gap at the center of the collecting tank, slides evenly from all sides along the steam heating pipe to the surface of the film heating surface, forms a thin film, and continues to slide along the surface of the film heating surface, and during the sliding process, is heated and concentrated by the steam heating pipe inside the film heating surface, thereby achieving further concentration treatment; the concentrated raw material liquid flows to the bottom of the vacuum concentration tank and enters the next cycle of concentration treatment; when the concentration treatment is completed, the steam entry is closed, valves I and valve II are closed, and valve III is opened to transport and discharge the concentrated raw material liquid.

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