Filtration treatment system for dibutyl phthalate synthesis process

Abstract

The utility model belongs to the technical field of dibutyl phthalate, and particularly relates to a filtering treatment system for a dibutyl phthalate synthesis process. The filtering treatment system for the dibutyl phthalate synthesis process comprises a dealcoholization kettle, a bottom outlet of the dealcoholization kettle is connected with an inlet of a filtering pump through a pipeline, and an outlet of the filtering pump is connected with an inlet of a diatomite filtering machine. An outlet of the diatomite filter is respectively connected with a top inlet of the dealcoholization kettle and an inlet of a finished product cooler through pipelines, an outlet of the finished product cooler is connected with an inlet of a fine filter, an outlet of the fine filter is connected with an inlet of a finished product tank, and an outlet of the finished product tank is connected with an inlet of a finished product pump; and an outlet of the finished product pump is respectively connected with a qualified product pipeline, an unqualified product pipeline and a finished product tank circulating pipeline. The treatment system is simple in structure, easy to operate and high in impurity removal rate, impurities and particles in materials can be effectively filtered, and the quality and purity of products are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of dibutyl phthalate, in particular to a filtering treatment system for a process of synthesizing dibutyl phthalate. Background Art

[0002] Synthetic dibutyl phthalate is a plasticizer widely used in the fields of plastics, rubber, coatings, etc. Its production process mainly relies on esterification reaction. The reaction principle is: add phthalic anhydride and butanol into the esterification kettle, heat to 120-150℃ under the catalytic action of concentrated sulfuric acid to react, and generate dibutyl phthalate and water. However, since the reaction is a reversible reaction, during the reaction, the generated dibutyl phthalate (hereinafter referred to as crude ester) will contain a certain amount of impurities such as unreacted phthalic anhydride, excess butanol, and catalyst concentrated sulfuric acid.

[0003] In order to improve the purity and quality of the product, the method of removing impurities has been adopted in the early production process. However, after the early treatment, the pigment and a small amount of visible impurities in the crude ester are still difficult to completely remove. The presence of these impurities not only affects the appearance of the product, but may also have an adverse effect on the performance of the product. Therefore, developing an effective filtration treatment system for further removing the pigment and visible impurities in the crude ester is of great significance for improving the product quality of synthetic dibutyl phthalate. Utility Model Content

[0004] In view of the above deficiencies in the prior art, the purpose of the utility model is to provide a filtration treatment system for the process of synthesizing dibutyl phthalate, which has a simple structure, is easy to operate, has a high impurity removal rate, can effectively filter impurities and particles in the material, and improves the quality and purity of the product.

[0005] The utility model is realized by adopting the following technical solutions:

[0006] The filtering and processing system of the process for synthesizing dibutyl phthalate comprises a dealcoholization kettle, which is used for removing alcohol impurities in the process of synthesizing dibutyl phthalate; the bottom outlet of the dealcoholization kettle is connected to the inlet of a filter pump through a pipeline, and the function of the filter pump is to provide power for the material and pump it from the dealcoholization kettle to a diatomaceous earth filter for filtering; the outlet of the filter pump is connected to the inlet of the diatomaceous earth filter, and the adsorption and filtering ability of the diatomaceous earth is utilized to remove the pigment and visible impurities in the material, thereby improving the purity of the material; the outlet of the diatomaceous earth filter is respectively connected to the top inlet of the dealcoholization kettle and the inlet of a finished product cooler through pipelines, and the finished product cooler is used for cooling the filtered material and reducing its temperature to a range suitable for subsequent processing; the outlet of the finished product cooler is connected to the inlet of a fine filter, and the fine filter is used for further filtering the material, removing finer impurities, sediments, suspended matter, etc., thereby improving the final quality of the product; the outlet of the fine filter is connected to the inlet of a finished product tank, and the outlet of the finished product tank is connected to the inlet of a finished product pump, and the outlet of the finished product pump is respectively connected to a qualified product pipeline, a non-qualified product pipeline and a finished product tank circulation pipeline.

[0007] A sight glass is provided on the pipeline from the outlet of the diatomaceous earth filter to the top inlet of the dealcoholization kettle, so that the operator can visually observe the clarity of the material and timely monitor the effect of filter cake formation inside the filter.

[0008] The diatomaceous earth filter is provided with a pressure gauge for real-time monitoring of the working pressure of the diatomaceous earth filter to ensure that the equipment operates within a normal range.

[0009] The finished product cooler is connected with a circulating water inlet pipeline and a circulating water return pipeline.

[0010] The fine filter is provided with a filter bag, which is replaced regularly.

[0011] The fine filter is provided with a bottom cover, and the bottom cover is connected with a miscellaneous ester receiving tank through a pipeline.

[0012] An exhaust port is arranged on the top of the finished product tank, and the exhaust port is connected to the buffer tank through a pipeline.

[0013] The working principle of the device is as follows:

[0014] First, the material is roughly filtered. The material in the dealcoholization kettle is pumped to the diatomaceous earth filter under the action of the filter pump. After the rough filtration, it returns from the top inlet of the dealcoholization kettle. After a period of cyclic rough filtration, when the material is clear and transparent when observed from the self-viewing mirror, it means that a uniform filter cake has been formed in the filter. At this time, close the pipeline from the outlet of the diatomaceous earth filter to the top inlet of the dealcoholization kettle, open the outlet of the diatomaceous earth filter to the inlet pipeline of the finished product cooler, the material enters the finished product cooler for cooling, and then enters the fine filter for fine filtration. The finely filtered material is discharged into the finished product tank. Sample and test the material in the finished product tank. Under the action of the finished product pump, the qualified material is discharged into the storage tank from the qualified product pipeline, and the unqualified material is transported from the unqualified product pipeline to the next unit for further processing. After the materials of different batches are discharged into the finished product tank, open the circulation pipeline of the finished product tank, and the materials are self-circulated under the action of the finished product pump to ensure that the materials of different batches are mixed evenly.

[0015] After using for a period of time, replace the filter bag in the fine filter. Before replacement, open the bottom cover of the fine filter, first drain the impurities remaining in the fine filter into the impurity receiving tank, and then replace the new filter bag after draining. Monitor the working pressure of the diatomaceous earth filter in real time according to the pressure gauge. When the working pressure exceeds the upper limit of the normal range, stop the coarse filtration and clean the diatomaceous earth filter, replace the new diatomaceous earth, and repeat the cycle of the filter to form a filter cake to ensure the next coarse filtration effect.

[0016] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0017] (1) The filtration treatment system of the process for synthesizing dibutyl phthalate described in the utility model has a simple structure, is easy to operate, has a high impurity removal rate, can effectively filter impurities and particles in the material, and improves the quality and purity of the product;

[0018] (2) The filtration treatment system of the process for synthesizing dibutyl phthalate described in the utility model effectively improves production efficiency and only requires regular cleaning and maintenance without other consumption, thereby saving production costs and reducing the generation of waste, thereby meeting environmental protection requirements;

[0019] (3) The filtration treatment system of the process for synthesizing dibutyl phthalate described in the utility model utilizes the adsorption and filtration capabilities of diatomaceous earth to effectively remove pigments and visible impurities in the material, reduce their impact on the equipment, and avoid damage to the equipment caused by them. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a filtration treatment system for the process for synthesizing dibutyl phthalate described in the utility model;

[0021] In the figure: 1. dealcoholization kettle; 2. filter pump; 3. diatomaceous earth filter; 4. finished product cooler; 5. fine filter; 6. finished product tank; 7. finished product pump; 8. qualified product pipeline; 9. unqualified product pipeline; 10. finished product tank circulation pipeline; 11. sight glass; 12. pressure gauge; 13. circulating water inlet pipeline; 14. circulating water return pipeline; 15. filter bag; 16. impurity ester receiving tank; 17. buffer tank. DETAILED DESCRIPTION

[0022] In order to make the purpose and technical solution of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings.

[0023] Example 1

[0024] like Figure 1 As shown, the filtration treatment system of the process for synthesizing dibutyl phthalate comprises a dealcoholization kettle 1, the bottom outlet of the dealcoholization kettle 1 is connected to the inlet of a filter pump 2 through a pipeline, the outlet of the filter pump 2 is connected to the inlet of a diatomaceous earth filter 3, the outlet of the diatomaceous earth filter 3 is connected to the top inlet of the dealcoholization kettle 1 and the inlet of a finished product cooler 4 through pipelines, the outlet of the finished product cooler 4 is connected to the inlet of a fine filter 5, the outlet of the fine filter 5 is connected to the inlet of a finished product tank 6, the outlet of the finished product tank 6 is connected to the inlet of a finished product pump 7, and the outlet of the finished product pump 7 is respectively connected to a qualified product pipeline 8, a non-qualified product pipeline 9 and a finished product tank circulation pipeline 10.

[0025] A sight glass 11 is provided on the pipeline from the outlet of the diatomaceous earth filter 3 to the top inlet of the dealcoholization kettle 1 .

[0026] The diatomaceous earth filter 3 is provided with a pressure gauge 12 .

[0027] The finished product cooler 4 is connected to a circulating water inlet pipeline 13 and a circulating water return pipeline 14 .

[0028] The fine filter 5 is provided with a filter bag 15 .

[0029] The fine filter 5 is provided with a bottom cover, and the bottom cover is connected to a ester receiving tank 16 through a pipeline.

[0030] The top of the finished product tank 6 is provided with an exhaust port, which is connected to the buffer tank 17 through a pipeline.

[0031] When working, the specific steps are as follows:

[0032] The material in the dealcoholization kettle 1 is pumped to the diatomite filter 3 under the action of the filter pump 2 for coarse filtration, and the coarse filtration is returned from the top entrance of the dealcoholization kettle 1. After a period of cyclic coarse filtration, the material in the diatomite filter 3 is fully and evenly mixed with the diatomite. After the self-viewing mirror 11 observes that the material is clear and transparent, the cycle of forming a uniform filter cake in the diatomite filter 3 is completed. Close the pipeline from the outlet of the diatomite filter 3 to the top entrance of the dealcoholization kettle 1, open the outlet of the diatomite filter 3 to the inlet pipeline of the finished product cooler 4, and continue to carry out fine filtration. After using for a period of time, the working pressure of the diatomite filter 3 is monitored by the pressure gauge 12. When the working pressure exceeds the upper limit of the normal range, stop the coarse filtration and clean the diatomite filter 3, replace new diatomite, repeat the cycle operation of the filter to form a filter cake, and ensure the coarse filtration effect next time.

[0033] After the pigments and visible impurities in the material are filtered out by coarse filtration, the material is finely filtered. The material first enters the finished product cooler 4 for cooling. The cooled material enters the fine filter 5 for fine filtration to remove finer impurities, sediments, suspended matter, etc. in the material. The finely filtered material enters the finished product tank 6 from the fine filter 5 for sampling and testing. After the material is qualified, it is discharged into the storage tank. The filter bag 15 in the fine filter 5 is replaced regularly. First, open the bottom cover of the fine filter 5, and discharge the residual impurities in the fine filter 5 to the impurity receiving tank 16. After it is discharged, the filter bag 15 is replaced.

Claims

1. A filtration treatment system for a process for synthesizing dibutyl phthalate, characterized in that: The invention comprises a dealcoholization kettle (1), wherein the bottom outlet of the dealcoholization kettle (1) is connected to the inlet of a filter pump (2) through a pipeline, the outlet of the filter pump (2) is connected to the inlet of a diatomaceous earth filter (3), the outlet of the diatomaceous earth filter (3) is respectively connected to the top inlet of the dealcoholization kettle (1) and the inlet of a finished product cooler (4) through pipelines, the outlet of the finished product cooler (4) is connected to the inlet of a fine filter (5), the outlet of the fine filter (5) is connected to the inlet of a finished product tank (6), the outlet of the finished product tank (6) is connected to the inlet of a finished product pump (7), and the outlet of the finished product pump (7) is respectively connected to a qualified product pipeline (8), a non-qualified product pipeline (9) and a finished product tank circulation pipeline (10).

2. The filtration treatment system for the process of synthesizing dibutyl phthalate according to claim 1, characterized in that: A sight glass (11) is provided on the pipeline from the outlet of the diatomaceous earth filter (3) to the top inlet of the dealcoholization kettle (1).

3. The filtration treatment system for the process of synthesizing dibutyl phthalate according to claim 1, characterized in that: The diatomaceous earth filter (3) is provided with a pressure gauge (12).

4. The filtration treatment system for the process of synthesizing dibutyl phthalate according to claim 1, characterized in that: The finished product cooler (4) is connected to a circulating water inlet pipeline (13) and a circulating water return pipeline (14).

5. The filtration treatment system for the process of synthesizing dibutyl phthalate according to claim 1, characterized in that: The fine filter (5) is provided with a filter bag (15).

6. The filtration treatment system for the process of synthesizing dibutyl phthalate according to claim 1, characterized in that: The fine filter (5) is provided with a bottom cover, and the bottom cover is connected to a miscellaneous ester receiving tank (16) through a pipeline.

7. The filtration treatment system for the process of synthesizing dibutyl phthalate according to claim 1, characterized in that: The top of the finished product tank (6) is provided with an exhaust port, which is connected to the buffer tank (17) through a pipeline.

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