Purification system for succinic acid mother liquor

Abstract

The utility model relates to a purification system of succinic acid mother liquor. The purification system comprises a succinic acid mother liquor storage tank, a filtering device, an adsorption device, a degerming device and a raw material preparation tank which are connected in sequence, the succinic acid mother liquor storage tank is used for storing succinic acid mother liquor obtained after succinic acid crystal mush is filtered, the filtering device is used for removing particulate matter and insoluble impurities in the succinic acid mother liquor, the adsorption device is used for removing iron and nickel metal ions in the succinic acid mother liquor, and the sterilization device is used for removing microorganisms such as bacteria bred in the succinic acid mother liquor. The raw material preparation tank is used for preparing a raw material maleic acid aqueous solution. The purification system device is simple in structure, convenient to operate and good in purification effect, solves the problem that the purity of a succinic acid product cannot meet the downstream polyester polymerization requirement due to incomplete purification and cyclic utilization in the existing succinic acid mother liquor purification technology, improves the cyclic utilization rate of the succinic acid mother liquor, reduces environmental pollution and saves water resources.

Description

Technical Field

[0001] The utility model relates to a purification system, in particular to a purification system for succinic acid mother liquor. Background Art

[0002] Succinic acid is a colorless or white, odorless solid with a sour taste. It is one of the valuable platform compounds and has a wide range of uses in the chemical, material, pharmaceutical and food fields.

[0003] During the production process of succinic acid, succinic acid crystal slurry is obtained. After the succinic acid crystal slurry is filtered, the obtained succinic acid mother liquor still contains particulate matter and insoluble impurities, metal ions such as iron ions and nickel ions corroded by equipment, and bred bacteria and microorganisms. The succinic acid mother liquor is mainly circulated for the preparation of raw maleic acid aqueous solution. If the particulate matter and insoluble impurities, metal ions and microorganisms such as bacteria in the succinic acid mother liquor are not removed and circulated for the preparation of raw maleic acid aqueous solution, the purity of the succinic acid product will not meet the polymerization requirements of downstream polyester. If the succinic acid mother liquor is not recycled, the discharge will cause environmental pollution. At the same time, the preparation of the raw maleic acid aqueous solution increases the use of fresh water.

[0004] Patent CN218107014U is a succinic acid mother liquor purification device, which is equipped with a filter screen to filter out large particles in the succinic acid mother liquor, and a temperature adjustment combination is used to dissolve fine particles in the succinic acid mother liquor into the succinic acid mother liquor. A filling combination is used, and a condensation cover plate is arranged on the outer surface of the filling combination to prevent the succinic acid mother liquor from volatilizing after heating. Patent CN218516742U is a succinic acid mother liquor metal ion removal device, which uses a resin column to remove metal ions in the mother liquor. Patent CN206494872U is a crude adipic acid metal ion removal device, which includes an ion removal tower, an activated carbon decolorization feed pipe and a crude adipic acid solution pipe. The ion removal tower is respectively provided with an upper filter screen and a lower filter screen, and a cation exchange resin is filled between the upper filter screen and the lower filter screen.

[0005] Succinic acid mother liquor often contains particulate matter, insoluble impurities, and metal ions such as iron and nickel ions corroded from equipment. In addition, not all succinic acid mother liquor can be immediately recycled for the preparation of raw materials. Succinic acid mother liquor will breed bacteria and other microorganisms if stored for a long time. Therefore, a complete succinic acid mother liquor purification system is particularly important. Utility Model Content

[0006] The utility model provides a succinic acid mother liquor purification system to solve the problem that particulate matter and insoluble impurities, metal ions and microorganisms such as grown bacteria in succinic acid mother liquor affect the quality of succinic acid and thus cause downstream polymerization instability.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A succinic acid mother liquor purification system comprises a succinic acid mother liquor storage tank, a filter, an adsorbent, a sterilizing device, and a raw material preparation tank connected in sequence. The discharge port of the succinic acid mother liquor storage tank is connected to the feed port of the filter by a pipeline, the discharge port of the filter is connected to the feed port of the adsorbent by a pipeline, the discharge port of the adsorbent is connected to the feed port of the sterilizing device by a pipeline, and the discharge port of the sterilizing device is connected to the water injection port of the raw material preparation tank by a pipeline. The filter is used to remove particulate matter and insoluble impurities in the succinic acid mother liquor, the adsorbent is used to remove iron and nickel metal ions in the succinic acid mother liquor, and the sterilizing device is used to remove bacteria and other microorganisms in the succinic acid mother liquor. The purified succinic acid mother liquor is sent to the raw material preparation tank and circulated for the preparation of the raw material maleic acid aqueous solution.

[0009] The filtering device as described above includes any one or both of a mesh filter and a centrifugal filter, which are used to remove particulate matter and insoluble impurities in the succinic acid mother liquor.

[0010] As mentioned above, the adsorption device includes any one or more of activated carbon columns, carbon nanotube and graphene columns, chitosan columns, and zeolite columns. The selected same adsorption devices are all set up in two stages in parallel, one for use and one for standby, for adsorbing and removing iron and nickel metal ions in succinic acid mother liquor.

[0011] As mentioned above, the sterilization device includes any one or two or more of an ultraviolet sterilizer, an ozone sterilizer, a filter sterilizer, and a steam sterilizer, and is used to remove bacteria and other microorganisms in the succinic acid mother liquor.

[0012] As mentioned above, the filter sterilizer includes any one or two or more of diatomaceous earth filter, fused glass filter, porous polyethylene, polyvinyl chloride filter, and microporous membrane filter, which is used to remove bacteria and other microorganisms in the succinic acid mother liquor.

[0013] As described above, an online automatic heavy metal monitor is provided at the discharge pipeline end of the adsorption device for online real-time monitoring of the iron and nickel metal ion concentrations in the succinic acid mother liquor. And the online automatic heavy metal monitor is interlocked with the control valve at the feed pipeline end of the sterilizing device and the control valve at the reflux pipeline end of the adsorption device. When the concentration of iron and nickel metal ions reaches the standard, the control valve at the feed pipeline end of the sterilizing device opens, and the succinic acid mother liquor enters the sterilizing device. When the concentration of iron and nickel metal ions does not reach the standard, the control valve at the reflux pipeline end of the adsorption device opens, and the succinic acid mother liquor flows back into the adsorption device for treatment, and enters the sterilizing device again after the concentration of iron and nickel metal ions reaches the standard. The adsorption device handles the iron and nickel metal ion concentrations twice in a row and does not reach the standard, reflecting that the adsorption device fails, and switches to the parallel standby activated carbon column to continue to process the succinic acid mother liquor, and regenerates the failed adsorption device or replaces a new adsorption device.

[0014] As mentioned above, a microbial online detection analyzer is provided at the discharge pipeline end of the sterilization device, which is used to monitor the microbial concentration in the succinic acid mother liquor online in real time. And the online microbial monitoring sensor is interlocked with the control valve at the feed pipeline end of the raw material preparation tank and the control valve at the inlet end of the return pipeline of the sterilization device. When the microbial concentration reaches the standard, the control valve at the feed pipeline end of the raw material preparation tank is opened, and the succinic acid mother liquor enters the raw material preparation tank for recycling. When the microbial concentration does not reach the standard, the control valve at the return pipeline end of the sterilization device is opened, and the succinic acid mother liquor flows back into the sterilization device for treatment. After the concentration of the microorganism reaches the standard, it enters the raw material preparation tank again. If the sterilization device fails to reach the standard in microbial concentration for two consecutive times, it reflects that the sterilization device has failed, and the sterilization device components should be cleaned or replaced, including the ultraviolet lamp of the ultraviolet sterilizer, the discharge tube of the ozone sterilizer, and the filter element of the filter sterilizer.

[0015] The use process of the purification system of succinic acid mother liquor as described above comprises the following steps:

[0016] Step (1) the succinic acid mother liquor enters the filtering device from the outlet of the succinic acid mother liquor storage tank, filters to remove particulate matter and insoluble impurities, and enters the adsorption device through the outlet of the filtering device;

[0017] Step (2) the mother liquor from step (1) enters an adsorption device, and after the iron and nickel metal ions are removed by adsorption and the concentration reaches the standard, the mother liquor enters a sterilization device through the outlet of the adsorption device;

[0018] Step (3) the mother liquor from step (2) enters the sterilization device, removes the microorganisms and after reaching the standard concentration, enters the water injection port of the raw material preparation tank through the discharge port of the sterilization device, and is circulated for the preparation of the raw material maleic acid aqueous solution;

[0019] In step (4), if the concentration of iron and nickel metal ions does not meet the standard after monitoring and detection by an online automatic heavy metal monitoring instrument, the mother liquor from step (2) is refluxed into the adsorption device again, and then enters the sterilization device from the discharge pipeline of the adsorption device after the concentration of iron and nickel metal ions meets the standard;

[0020] If the microbial concentration in step (5) does not meet the standard after detection by the microbial online detection analyzer, the mother liquor from step (3) will be refluxed into the sterilization device again. After the microbial concentration meets the standard, it will enter the raw material preparation tank from the discharge pipeline of the sterilization device.

[0021] Compared with the existing technology, the beneficial effects of the utility model are:

[0022] Existing patent ZL202222801290.2 discloses a device for removing metal ions from succinic acid mother liquor using a resin column, and ZL202222039088.0 discloses a device for removing large particles from succinic acid mother liquor using a filter screen and dissolving fine particles in succinic acid mother liquor into succinic acid mother liquor using a temperature adjustment combination. The succinic acid mother liquor treated by these two devices still contains microorganisms such as bacteria, particulate matter or metal ions that breed, and directly circulates for the preparation of raw maleic acid aqueous solution, which will affect the purity of succinic acid and further affect the downstream polymerization effect, and further purification treatment is required. The utility model provides a complete set of succinic acid mother liquor purification system, and the purified succinic acid mother liquor is directly circulated for the preparation of raw maleic acid aqueous solution, and the purity of the produced succinic acid is high and meets the polymerization requirements of downstream polyester. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of a succinic acid mother liquor purification device;

[0024] Figure numbers: 1 succinic acid mother liquor; 2 succinic acid mother liquor storage tank; 3 filtering device; 4 adsorption device; 5 sterilization device; 6 raw material preparation tank; 7 adsorption device reflux pipeline; 8 sterilization device reflux pipeline. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but they are by no means intended to limit the scope of the present invention.

[0026] Embodiment 1: Refer to the accompanying drawings of the specification Figure 1As shown, the succinic acid mother liquor storage tank 2, the filtering device 3, the adsorption device 4, the sterilizing device 5, the raw material preparation tank 6, the adsorption device reflux pipeline 7, and the sterilizing device reflux pipeline 8 are connected in sequence. The discharge port of the succinic acid mother liquor storage tank is connected with the side feed port of the filtering device by a pipeline, the discharge port of the filtering device is connected with the side feed port of the adsorption device by a pipeline, the discharge port of the adsorption device is connected with the side feed port of the sterilizing device by a pipeline, the discharge port of the sterilizing device is connected with the side water injection port of the raw material preparation tank by a pipeline, the adsorption device reflux pipeline is connected with the adsorption device discharge port and the reflux feed port at the top of the adsorption device, and the sterilizing device reflux pipeline is connected with the sterilizing device discharge port and the reflux feed port at the top of the sterilizing device. The filtering device as described above is a mesh filter used to remove particulate matter and insoluble impurities in the succinic acid mother liquor, the adsorption device as described above is an activated carbon column used to remove iron and nickel metal ions in the succinic acid mother liquor, and the sterilization device as described above is an ultraviolet sterilizer used to remove bacteria and other microorganisms in the succinic acid mother liquor.

[0027] The use process of the utility model is as follows: the succinic acid mother liquor 1 from the succinic acid mother liquor storage tank 2 enters the filter device 3 through the pipeline from the filter device 3, after the sieve filtration removes the particulate matter and insoluble impurities, the mother liquor enters the adsorption device 4 through the pipeline from the discharge port of the filter device 3, after the activated carbon adsorption removes the iron and nickel metal ions, the mother liquor enters the sterilization device 5 through the pipeline from the discharge port of the adsorption device 4, after the ultraviolet light removes the bacteria and other microorganisms, the mother liquor enters the water injection port of the raw material preparation tank 6 through the pipeline from the discharge port of the sterilization device 5, and is circulated for the preparation of the raw material maleic acid aqueous solution. After the heavy metal online automatic monitoring instrument detects that the iron and nickel metal ion concentrations are not up to standard, the adsorbed mother liquor enters the adsorption device again through the adsorption device reflux pipeline 7, and enters the sterilization device 5 from the discharge pipeline of the adsorption device 4 after the iron and nickel metal ion concentrations meet the standard. If the concentration of bacteria and other microorganisms does not meet the standard after detection by the microbial online detection analyzer, the sterilized mother liquor will enter the sterilization device again through the sterilization device reflux pipeline 8, and enter the raw material preparation tank 6 from the sterilization device 5 discharge pipeline after the concentration of bacteria and other microorganisms meets the standard.

[0028] Example 2: Refer to the attached instructions Figure 1 The difference between this embodiment and embodiment 1 is that the adsorption device of the device adopts carbon nanotubes and graphene columns, and the sterilization device adopts a combination of a diatomaceous earth filter sterilizer and an ozone sterilizer.

[0029] Example 3: Refer to the attached specification Figure 1 The difference between this embodiment and embodiments 1 and 2 is that the filtering device of the device adopts a centrifugal filter, the adsorption device adopts a chitosan column, and the sterilization device adopts a vertical fused glass filter sterilizer.

[0030] Example 4: Refer to the attached instructions Figure 1The difference between this embodiment and embodiments 1-3 is that the adsorption device of the device adopts a zeolite column, and the sterilization device adopts a steam sterilizer.

[0031] Example 5: Refer to the attached instructions Figure 1 The difference between this embodiment and embodiments 1-3 is that the sterilization device of the device adopts a combination of a porous polyethylene filter sterilizer and an ultraviolet sterilizer.

[0032] Example 6: Refer to the attached instructions Figure 1 The difference between this embodiment and embodiments 1-3 is that the sterilization device of the device adopts a combination of a polyvinyl chloride filter sterilizer and a microporous membrane filter sterilizer.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that after reading the specification of this application, the technicians can still modify or replace the specific implementation methods of the utility model with equivalents, but these modifications or changes do not deviate from the scope of protection of the claims of the utility model application.

Claims

1. A purification system for succinic acid mother liquor, characterized in that It includes a succinic acid mother liquor storage tank, a filtering device, an adsorption device, a sterilizing device, and a raw material preparation tank which are connected in sequence; the discharge port of the succinic acid mother liquor storage tank is connected to the side feed port of the filtering device by a pipeline, the discharge port of the filtering device is connected to the side feed port of the adsorption device by a pipeline, the discharge port of the adsorption device is connected to the side feed port of the sterilizing device by a pipeline, and the discharge port of the sterilizing device is connected to the side water injection port of the raw material preparation tank by a pipeline; the purified succinic acid mother liquor is sent to the raw material preparation tank and circulated for the preparation of the raw material maleic acid aqueous solution.

2. A succinic acid mother liquor purification system according to claim 1, characterized in that The filtering device comprises any one or both of a mesh filter and a centrifugal filter.

3. A succinic acid mother liquor purification system according to claim 1, characterized in that The adsorption device comprises any one or two or more of an activated carbon column, a carbon nanotube and graphene column, a chitosan column, and a zeolite column. The selected identical adsorption devices are all arranged in two stages in parallel, one for use and one for standby.

4. A succinic acid mother liquor purification system according to claim 1, characterized in that The sterilization device includes any one or two or more of an ultraviolet sterilizer, an ozone sterilizer, a filter sterilizer, and a steam sterilizer.

5. A purification system for succinic acid mother liquor according to any one of claims 1 or 4, characterized in that Filter sterilizers include diatomaceous earth filters, fused glass filters, porous polyethylene, polyvinyl chloride filters, and microporous membrane filters.

6. A purification system for succinic acid mother liquor according to any one of claims 1 or 3, characterized in that An online automatic heavy metal monitor is also arranged near the discharge pipeline end of the adsorption device, and the online automatic heavy metal monitor is interlocked with the control valve at the feed pipeline end of the sterilization device and the control valve at the inlet end of the return pipeline of the adsorption device.

7. A purification system for succinic acid mother liquor according to any one of claims 1 or 4, characterized in that A microbial online detection analyzer is also arranged near the discharge pipeline end of the sterilization device, and the microbial online detection analyzer is interlocked with the control valve at the feed pipeline end of the raw material preparation tank and the control valve at the inlet end of the return pipeline of the sterilization device.

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