Nanofiltration membrane filtering device

Abstract

The utility model relates to a nanofiltration membrane filtering device which comprises an NF feeding tank, a feeding hole is formed in the top of the NF feeding tank, and upstream feed liquid enters the feeding hole of the NF feeding tank through a pipeline; the device further comprises a dialysis water tank, a tubular nanofiltration membrane, an NF cleaning tank, an NF light phase tank, a heavy phase tank, an acid tank and an alkali tank, a discharge port is formed in one side of the NF feeding tank, and the discharge port is connected with a feeding port in one side of the tubular nanofiltration membrane through a conveying pipe; the whole nanofiltration system is simple and compact, small in occupied area and low in energy consumption, and promotes the green development of the industry; the PLC automatic control device is adopted in the whole process, automatic operation can be achieved, labor cost is reduced, stability is good, and maintenance is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of nanofiltration membrane biological separation, in particular to a nanofiltration membrane filtering device. Background Art

[0002] With the huge market demand for allulose, the quality requirements for allulose in industrial production are becoming increasingly higher, while the contradiction between the low yellow chroma of allulose and the quality requirements of industrial production is becoming increasingly prominent.

[0003] In the traditional production process of allulose, the produced allulose is yellow in color, high in chroma, and contains many impurities, which seriously affects the product quality of allulose. The following problems exist in the traditional production process:

[0004] ① Traditional filtration membranes are a key part of the allulose production process. Filter cloths require frequent replacement, and the pore size of the membrane surface is too large. The filtered liquid still contains a large amount of pigments, inorganic salts, and aldehydes. During the allulose crystallization process, the presence of large amounts of aldehydes and impurities makes crystallization of allulose very difficult, resulting in poor crystallization results.

[0005] ② Traditional human resource requirements are high and time-consuming and labor-intensive, which seriously affects product quality and the continuity of subsequent production. Summary of the Invention

[0006] In order to solve the above technical problems, the utility model is a nanofiltration membrane filtration device, and its technical solution is as follows:

[0007] It includes an NF feed tank, with an inlet on the top of the NF feed tank, and the upstream feed liquid enters the inlet of the NF feed tank through a pipeline; it also includes a dialysis water tank, a tubular nanofiltration membrane, an NF cleaning tank, an NF light phase tank, a heavy phase tank, an acid tank and an alkali tank. A discharge port is provided on one side of the NF feed tank, and the discharge port is connected to the feed port on one side of the tubular nanofiltration membrane through a conveying pipe;

[0008] A feed port connected to the dialysis water tank delivery pipe is provided on the same side of the tubular nanofiltration membrane feed port; a heavy phase discharge port is provided on the other side of the tubular nanofiltration membrane and is connected to the NF heavy phase tank through a delivery pipe; a light phase discharge port is provided on the top of the tubular nanofiltration membrane and is connected to the NF light phase tank through a delivery pipe;

[0009] An inlet and an outlet are provided at the bottom of the tubular nanofiltration membrane, and the outlet of the tubular nanofiltration membrane is connected to the inlet at the top of the NF cleaning tank through a delivery pipe. The top of the NF cleaning tank is also provided with a pure water inlet, an acid tank inlet and an alkali tank inlet, which are respectively connected to the pure water outlet, the acid tank outlet and the alkali tank outlet through delivery pipes;

[0010] There is an outlet at the bottom of the NF cleaning tank, which is divided into two paths through a conveying pipe, one path is discharged to the sewage tank, and the other path is refluxed to the bottom inlet of the tubular nanofiltration membrane.

[0011] Furthermore, the NF feed tank output pipe, the dialysis water tank output pipe, the acid tank output pipe, the alkali tank output pipe and the NF cleaning tank output pipe are all provided with metering pumps.

[0012] Furthermore, control valves are respectively installed on the pure water output pipe, the output pipe connecting the tubular nanofiltration membrane and the NF cleaning tank, the output pipe connecting the NF cleaning tank and the sewage tank, and the output pipe between the NF cleaning tank and the tubular nanofiltration membrane.

[0013] Furthermore, on the output pipe between the NF cleaning tank and the tubular nanofiltration membrane, a control valve is arranged behind the metering pump along the output direction.

[0014] The beneficial effects of the utility model are as follows: the utility model is a nanofiltration membrane filtration device, in which a tubular nanofiltration membrane, a dialysis water tank, an acid tank, an alkali tank, an NF cleaning tank and pure water are used. The upstream feed liquid enters the NF feed tank and the dialysis water in the dialysis water tank enters the tubular nanofiltration membrane for nanofiltration. The dialysis water used in the tubular nanofiltration membrane enters the NF cleaning tank. Acid, alkali and pure water are added to the NF cleaning tank for flushing. Under the action of the control valve, the sewage is discharged into the sewage tank, and the recycled water flows back into the tubular nanofiltration membrane. The tubular nanofiltration membrane separates the light phase and the heavy phase, which enter the NF light phase tank and the NF heavy phase tank respectively. The metering pump and various valves can be manually controlled or connected to a PLC automatic control device. The invention can effectively remove pigments and some inorganic salts, thereby reducing the chromaticity of the discharge from the evaporator in the subsequent process section and preventing the discharge from being too yellow. The invention increases the content of allulose and removes aldehydes and impurities in the liquid feed, thereby ensuring that the content of aldehydes and other substances in the subsequent crystallization process section is reduced, resulting in a better crystallization effect and ensuring production stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the utility model;

[0016] As shown in the figure, 1NF feed tank, 2 dialysis water tank, 3 tubular nanofiltration membrane, 4NF cleaning tank, 5NF light phase tank, 6NF heavy phase tank, 7 acid tank, 8 alkali tank, 9 metering pump, 10 control valve. DETAILED DESCRIPTION

[0017] As shown in the figure, the present invention is a nanofiltration membrane filtration device, comprising an NF feed tank 1, a dialysis water tank 2, a tubular nanofiltration membrane 3, an NF cleaning tank 4, an NF light phase tank 5, an NF heavy phase tank 6, an acid tank 7, an alkali tank 8, a metering pump 9, and a control valve 10. The present invention removes pigments and some inorganic salts, reducing the color of the evaporator discharge in the subsequent process and preventing the discharge from being excessively yellow. The nanofiltration membrane filtration device increases the allulose content and removes aldehydes and impurities from the feed liquid, ensuring a reduced content of aldehydes and other substances in the subsequent crystallization process, resulting in better crystallization results and ensuring production stability. The tubular nanofiltration membrane increases the allulose content in the feed liquid from 97% to 98.5%, resolving the industry's challenge of difficulty in crystallizing allulose and increasing production by 0.31 tons per day. This allows the production process to be completed efficiently and energy-efficiently, greatly improving production stability.

[0018] The NF feed tank 1 and the dialysis water tank 2 enter the tubular nanofiltration membrane 3 through the delivery pipe via the metering pump 9 respectively. After nanofiltration, the light phase and heavy phase are separated and enter the NF light phase tank 5 and the NF heavy phase tank 6 respectively; the nanofiltration water enters the NF cleaning tank 4; the pure water, acid tank 7, and alkali tank 8 enter the NF cleaning tank 4; the sewage from the NF cleaning tank 4 is discharged to the sewage system; part of it flows back into the tubular nanofiltration membrane 3; the metering pump 9 and the valves 10 at various locations are connected to the PLC automatic control device.

[0019] Used in this example:

[0020] The NF feed tank is a steel-lined plastic vertical storage tank with a capacity of 9.42m 2 ;

[0021] The tubular nanofiltration membrane is PL-G-6410-F / P, with an effective membrane area of ​​69m 2 ;

[0022] The NF cleaning tank is a CIP tank with a radius of 2m, a height of 3m and a volume of 9.42m 2 ;

[0023] The NF heavy phase tank is a steel-lined plastic vertical storage tank with a volume of 9.42m 2 ;

[0024] The NF light phase tank is a steel-lined plastic vertical storage tank with a volume of 9.42m 2 ;

[0025] The dialysis water tank is a CIP tank with a radius of 2m, a height of 3m and a volume of 9.42m 2 ;

[0026] The acid tank is the Jiangnan dosing box MC-100L, with a capacity of 100L;

[0027] The alkali tank is the Jiangnan dosing box MC-100L with a capacity of 100L.

[0028] The operation process of this utility model:

[0029] ① In actual application, the upstream feed liquid enters the NF feed tank 1, and the feed liquid in the NF feed tank 1 and the dialyzed water in the dialyzed water tank 2 respectively send signals to the metering pumps of the delivery pipes through the PLC automatic control device, and enter the tubular nanofiltration membrane 3 for tubular nanofiltration membrane filtration.

[0030] ② The PLC automatic control device sends signals to the corresponding control valves and metering pumps on the four input pipes of the NF cleaning tank, allowing the used dialysate water to enter the NF cleaning tank 4. Acid, alkali, and pure water are added to the NF cleaning tank 4 for flushing;

[0031] ③The PLC automatic control device then sends signals to the control valve and metering pump on the output pipe of the NF cleaning tank, and the sewage is discharged into the sewage tank, and the recyclable water flows back into the tubular nanofiltration membrane 3; the tubular nanofiltration membrane 3 separates the light phase and the heavy phase, which enter the NF light phase tank 5 and the NF heavy phase tank 6 respectively; the PLC automatic control device is used throughout the process, and the system will automatically perform nanofiltration membrane filtration.

[0032] According to actual conditions, pressure gauges, ammeters, etc. can also be installed, all of which are connected to the PLC automatic control device together with the metering pump and various control valves.

[0033] Compared with traditional membrane filtration technology, the advantages of this utility model are:

[0034] (1) The filtration and purification process is carried out at room temperature, without phase change, chemical reaction, introduction of other impurities, or decomposition and denaturation of the product, making it particularly suitable for filtering liquid feeds;

[0035] (2) It can remove salt from the feed solution, reduce the ash content of the feed solution, and improve the purity of the final product, allulose. Compared with solvent desalination, it not only has better product quality but also improves the yield;

[0036] (3) The process has high yield and low loss;

[0037] (4) During the nanofiltration process, the effective substances such as acid, alkali, and alcohol in the solution can be recovered through the NF cleaning tank, realizing the recycling of resources;

[0038] (5) The entire nanofiltration system is simple and compact, occupies a small area, has low energy consumption, and promotes the green development of the industry;

[0039] (6) Easy to operate, the whole process adopts PLC automatic control device, which can realize automated operation, reduce labor costs, have good stability and easy maintenance.

[0040] According to calculations based on actual operating conditions, after adopting the utility model, the content of allulose in the slurry increased from 97% to 98.5%, solving the industry problem of difficulty in crystallizing allulose. It is calculated that the output can be increased by 0.31 tons per day.

[0041] 20 / 40% / 97%*98.5%*40%-20=0.31 tons / day

[0042] (The daily production of allulose is 20 tons;

[0043] The yield of allulose was 40%;

[0044] The content of allulose before applying the utility model was 97%;

[0045] After applying the utility model, the content of allulose is 98.5%;)

[0046] According to market conditions, sales can be increased by:

[0047] 0.31*300*20000=1.86 million yuan

[0048] (After applying the utility model, the output of allulose increased by 0.31 tons / day;

[0049] The actual number of days for allulose production per year is 300 days;

[0050] The selling price of allulose is 20,000 yuan / ton;)

[0051] Sales can increase by 1.86 million yuan each year.

[0052] Therefore, the utility model can increase the annual benefit by 1.86 million yuan.

[0053] The filtration and purification process of the utility model is carried out at room temperature, without phase change, chemical reaction, introduction of other impurities, or decomposition and denaturation of the product, and is particularly suitable for filtering liquid feed; the salt content of the liquid feed can be removed, the ash content of the liquid feed can be reduced, and the purity of the final product, allulose, can be improved. Compared with solvent desalination, not only is the product quality better, but the yield can also be improved; the process has a high yield and low loss; during the nanofiltration process, effective substances such as acid, alkali, and alcohol in the solution can be recovered through the NF cleaning tank, thereby realizing the recycling of resources; the entire nanofiltration system is simple and compact, occupies a small area, has low energy consumption, and promotes the green development of the industry; it is easy to operate, and adopts a PLC automatic control device throughout the process, which can realize automated operation, reduce labor costs, have good stability, and are easy to maintain.

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A nanofiltration membrane filtration device, comprising a NF feed tank (1), wherein a feed inlet is provided on the top of the NF feed tank (1), and upstream feed liquid enters the NF feed tank inlet through a pipeline; characterized in that: It also includes a dialysis water tank (2), a tubular nanofiltration membrane (3), an NF cleaning tank (4), an NF light phase tank (5), an NF heavy phase tank (6), an acid tank (7) and an alkali tank (8). One side of the NF feed tank (1) is provided with a discharge port, which is connected to the feed port on one side of the tubular nanofiltration membrane (3) through a conveying pipe; A feed port connected to a delivery pipe of the dialysis water tank (2) is provided on the same side of the feed port of the tubular nanofiltration membrane (3); a heavy phase discharge port is provided on the other side of the tubular nanofiltration membrane (3) and is connected to the NF heavy phase tank (6) through a delivery pipe; a light phase discharge port is provided on the top of the tubular nanofiltration membrane (3) and is connected to the NF light phase tank (5) through a delivery pipe; An inlet and an outlet are respectively provided at the bottom of the tubular nanofiltration membrane (3), and the outlet of the tubular nanofiltration membrane (3) is connected to the top inlet of the NF cleaning tank (4) through a delivery pipe. The top of the NF cleaning tank is also provided with a pure water inlet, an acid tank inlet, and an alkali tank inlet, which are respectively connected to the pure water outlet, the acid tank outlet, and the alkali tank outlet through delivery pipes. An outlet is provided at the bottom of the NF cleaning tank (4), and is divided into two paths through a delivery pipe, one path being discharged to the sewage tank, and the other path being refluxed to the bottom inlet of the tubular nanofiltration membrane (3).

2. A nanofiltration membrane filtration device according to claim 1, characterized in that: The output pipe of the NF feed tank (1), the output pipe of the dialysis water tank (2), the output pipe of the acid tank (7), the output pipe of the alkali tank (8) and the output pipe of the NF cleaning tank (4) are all provided with a metering pump (9).

3. A nanofiltration membrane filtration device according to claim 1, characterized in that: Control valves are respectively installed on the pure water output pipe, the output pipe connecting the tubular nanofiltration membrane (3) and the NF cleaning tank (4), the output pipe connecting the NF cleaning tank (4) and the sewage tank, and the output pipe connecting the NF cleaning tank (4) and the tubular nanofiltration membrane (3).

4. A nanofiltration membrane filtration device according to claim 3, characterized in that: On the output pipe between the NF cleaning tank (4) and the tubular nanofiltration membrane (3), a control valve (10) is arranged behind the metering pump (9) along the output direction.

Images