Anti-blocking system of PBS intermittent pilot plant

Abstract

The utility model relates to the technical field of PBS pilot test, in particular to an anti-blocking system of a PBS intermittent pilot test device. The anti-blocking system of the PBS intermittent pilot plant comprises a reaction kettle, the reaction kettle is connected with a heat exchanger through an esterification process tower, the heat exchanger is connected with an esterification water collecting tank A through a first buffer tank, the reaction kettle is connected with a second main filter through a polymerization process tower, and the second main filter is connected with a vacuum pump set through a second buffer tank. According to the system, a group of filters which have a cooling effect and can be switched and put into use in time are additionally arranged at the vacuumizing pipeline in parallel, and easily crystallized micromolecules or succinic anhydride generated during vacuumizing can be actively blocked to the maximum extent, so that the vacuumizing pipeline is prevented from being blocked.

Description

TECHNICAL FIELD

[0001] The utility model relates to PBS pilot technology field, concretely is PBS intermittent pilot plant anti -blocking system. BACKGROUND

[0002] With the increase of traditional non-degradable plastic products, the environmental pollution caused by its waste is more and more serious, and the microplastics generated by it can also reach the human body through the 'food chain', which can affect the human body. As a kind of completely green biodegradable material with excellent mechanical properties and forming process, polybutylene succinate (PBS) will gradually replace traditional products such as disposable tableware, etc., and because of its good biocompatibility and bioabsorbability, it can also be used for disposable medical supplies. The biological enzymes secreted by microorganisms in nature can cause the PBS macromolecular chain to break, and can completely degrade to form small molecules of water and carbon dioxide, which is 'friendly' to the environment, and has no harm to the environment after degradation, and can realize the recycling of resources.

[0003] Polybutylene succinate (PBS) is a high molecular polyester compound generated by polymerization of small molecule succinic anhydride or succinic acid and 1,4-butanediol. The melting point of PBS is 105-116℃, and it is a white crystalline polymer at room temperature and a molten state at high temperature. In the process of synthesizing PBS, small molecules of water, butanediol and some by-products of tetrahydrofuran (THF) and small molecule compounds will be generated. In order to ensure the forward progress of the reaction, it is necessary to continuously remove small molecules of water, butanediol and some by-products of tetrahydrofuran (THF) and small molecule compounds from the system to ensure that the synthesized PBS meets the corresponding product performance requirements. During the process of removing small molecules of water, butanediol and some by-products of tetrahydrofuran (THF) and small molecule compounds, the vacuum pipeline will be blocked, mainly because the removed small molecules or succinic anhydride crystallize in the vacuum pipeline due to temperature reduction. In order to ensure the normal progress of the reaction, it is necessary to stop the work and clean the blockage in the pipeline, thereby consuming a lot of manpower and financial resources. UTILITY MODEL CONTENT

[0004] According to the deficiencies in the above prior art, the purpose of the utility model is to provide a PBS intermittent pilot plant anti-blocking system. At the vacuum pipeline, a set of filters with cooling effect capable of timely switching and use are connected in parallel, which can "actively" block the small molecules or succinic anhydride prone to crystallization generated during vacuumizing to the maximum extent, thereby preventing the vacuum pipeline from being blocked. At the same time, differential pressure gauges are added at both ends of the parallel filters, which can real-time monitor the operation of the filters, and when the designed differential pressure is reached, the standby filter is switched to clean the blocked filter, which greatly improves the production efficiency and reduces the production cost.

[0005] The utility model discloses a following technical scheme realizes:

[0006] The PBS intermittent pilot plant anti -blocking system, including the reaction kettle, the reaction kettle is connected with the heat exchanger through esterification process tower, the heat exchanger is connected with esterification water collection jar A through first buffer tank, the reaction kettle is connected with second main filter through polymerization process tower, and second main filter is connected with vacuum pump group through second buffer tank.

[0007] The first buffer tank is connected with the second buffer tank through the buffer tank pipeline, and the polymerization process tower is connected with the buffer tank pipeline through the second main filter.

[0008] The second auxiliary filter and the differential pressure gauge are arranged between the polymerization process tower and the buffer tank pipeline, the second auxiliary filter is connected with the second main filter in parallel, and the esterification water collection jar B is connected to the polymerization process tower.

[0009] The cooling tank is connected to the reaction kettle, the cooling tank is connected with the collection jar through the first auxiliary filter, the reaction kettle is connected with the cooling tank, and the material in the reaction kettle is cooled.

[0010] The first main filter and the first auxiliary filter are connected in parallel between the cooling tank and the collection jar.

[0011] The collection jar is connected with the reaction kettle, the first main filter and the first auxiliary filter are connected with the delivery pump through the pipeline, the delivery pump is connected with the second main filter through the pipeline, and the delivery pump is connected with the second auxiliary filter through the pipeline.

[0012] The synthesis mechanism of PBS is as follows:

[0013]

[0014] It can be seen that in the process of synthesizing PBS, small molecules of water, butanediol and some by-products of tetrahydrofuran (THF) and small molecule compounds will be generated. In order to ensure the forward progress of the reaction, it is necessary to continuously remove small molecules of water, butanediol and some by-products of tetrahydrofuran (THF) and small molecule compounds to ensure that the synthesized PBS meets the corresponding product performance requirements.

[0015] After the raw materials are treated in the reaction kettle, the pipeline enters the esterification process tower for treatment, the generated gas phase is treated through the heat exchanger and the first buffer tank, and then enters the esterification water collection jar A for collection, the liquid phase generated by the esterification process tower is treated through the pipeline and enters the polymerization process tower, the generated gas phase is filtered through the second main filter and then enters the second buffer tank, and the generated liquid phase enters the esterification water collection jar B; the cooling tank is used for recycling butanediol in the reaction kettle, which is treated through the first main filter and then washed through the delivery pump to the second main filter.

[0016] Compared with the prior art, the PBS intermittent pilot plant anti-blocking system has the beneficial effects that:

[0017] The PBS intermittent pilot plant anti-blocking system has the beneficial effects that: the PBS intermittent pilot plant anti-blocking system is provided with a set of filters with cooling effect in parallel at the vacuum pipeline, which can "actively" maximize the blocking of small molecules or succinic anhydride that are prone to crystallize during vacuumizing, thereby preventing the vacuum pipeline from being blocked; at the same time, differential pressure gauges are added to both ends of the parallel filters, which can real-time monitor the operation of the filters, and when the designed differential pressure is reached, the standby filter is switched to clean the blocked filter, greatly improving the production efficiency and reducing the production cost, solving the problem of vacuum pipeline blockage, and saving the loss of manpower and material resources caused by the treatment of pipeline blockage; the liquid phase obtained from the cooling tank is used to flush the second main filter and the second auxiliary filter through the setting of the delivery pump, which improves the production efficiency, reduces the operation cost of the intermittent device, and recycles the recovered butanediol. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structure schematic view of the PBS intermittent pilot plant anti-blocking system.

[0019] In the figure: 1, reaction kettle; 2, esterification process column; 3, polymerization process column; 4, heat exchanger; 5, first buffer tank; 6, esterification water collection tank A; 7, differential pressure gauge; 8, second main filter; 9, second auxiliary filter; 10, second buffer tank; 11, vacuum pump set; 12, esterification water collection tank B; 13, cooling tank; 14, collection tank; 15, first main filter; 16, first auxiliary filter; 17, delivery pump; 18, buffer tank inlet pipeline. DETAILED DESCRIPTION

[0020] In order to make the purpose and technical scheme of the utility model more clear and explicit, the utility model will be further described in detail below with reference to the drawings.

[0021] Example 1

[0022] As Figure 1As shown, the PBS intermittent pilot plant anti-blocking system comprises a reaction kettle 1, the reaction kettle 1 is connected with a esterification process column 2 and a heat exchanger 4, the heat exchanger 4 is connected with an esterification water collecting tank A 6 through a first buffer tank 5, the reaction kettle 1 is connected with a second main filter 8 through a polymerization process column 3, the second main filter 8 is connected with a vacuum pump group 11 through a second buffer tank 10. The first buffer tank 5 is connected with the second buffer tank 10 through an inlet buffer tank pipeline 18, the polymerization process column 3 is connected with the inlet buffer tank pipeline 18 through the second main filter 8. A second auxiliary filter 9 and a differential pressure gauge 7 are arranged between the polymerization process column 3 and the inlet buffer tank pipeline 18, the second auxiliary filter 9 is connected with the second main filter 8 in parallel, and the polymerization process column 3 is connected with an esterification water collecting tank B 12. The reaction kettle 1 is connected with a cooling tank 13, the cooling tank 13 is connected with a collecting tank 14 through a first auxiliary filter 16. A first main filter 15 is arranged between the cooling tank 13 and the collecting tank 14, and the first main filter 15 is connected with the first auxiliary filter 16 in parallel. The collecting tank 14 is connected with the reaction kettle 1, the first main filter 15 and the first auxiliary filter 16 are both connected with a delivery pump 17 through pipelines, the delivery pump 17 is connected with the second main filter 8 through a pipeline, and the delivery pump 17 is connected with the second auxiliary filter 9 through a pipeline.

[0023] The PBS intermittent pilot plant anti-blocking system comprises the following steps during operation:

[0024] (1) After the raw materials are treated in the reaction kettle 1, they are sent into the esterification process column 2 through a pipeline for treatment, the generated gas phase is treated through the heat exchanger 4 and the first buffer tank 5, and then is collected in the esterification water collecting tank A 6, the liquid phase generated by the esterification process column 2 is sent into the polymerization process column 3 through a pipeline for treatment, the generated gas phase is filtered through the second main filter 8 and then is sent into the second buffer tank 10, and the generated liquid phase is sent into the esterification water collecting tank B 12; (2) the cooling tank 13 is used for recycling butanediol in the reaction kettle 1, and the butanediol is treated through the first main filter 15 and then is washed to the second main filter 8 through the delivery pump 17.

Claims

1. A PBS batch pilot plant anti-plugging system, characterized in that, It includes the reaction kettle (1), the reaction kettle (1) is connected with the heat exchanger (4) through the esterification process column (2), the heat exchanger (4) is connected with the esterification water collection tank A (6) through the first buffer tank (5), the reaction kettle (1) is connected with the second main filter (8) through the polymerization process column (3), the second main filter (8) is connected with the vacuum pump group (11) through the second buffer tank (10).

2. The PBS batch pilot plant anti-plugging system of claim 1, wherein, The first buffer tank (5) is connected with the second buffer tank (10) through the buffer tank inlet pipeline (18), and the polymerization process column (3) is connected with the buffer tank inlet pipeline (18) through the second main filter (8).

3. The PBS batch pilot plant anti-plugging system of claim 2, wherein, The polymerization process column (3) and the buffer tank inlet pipeline (18) are provided with a second auxiliary filter (9) and a differential pressure gauge (7), the second auxiliary filter (9) is connected with the second main filter (8) in parallel, and the polymerization process column (3) is connected with the esterification water collection tank B (12).

4. The PBS batch pilot plant anti-plugging system of claim 3, wherein, The reaction kettle (1) is connected with the cooling tank (13), and the cooling tank (13) is connected with the collection tank (14) through the first auxiliary filter (16).

5. The PBS batch pilot plant anti-plugging system of claim 4, wherein, The cooling tank (13) and the collection tank (14) are provided with a first main filter (15), and the first main filter (15) is connected with the first auxiliary filter (16) in parallel.

6. The PBS batch pilot plant anti-plugging system of claim 5, wherein, The collection tank (14) is connected with the reaction kettle (1), the first main filter (15) and the first auxiliary filter (16) are connected with the delivery pump (17) through pipelines, the delivery pump (17) is connected with the second main filter (8) through a pipeline, and the delivery pump (17) is connected with the second auxiliary filter (9) through a pipeline.

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