Deslagging device in production of phthalic anhydride prepared by naphthalene method
By installing filters and centrifuges in the phthalic anhydride production process using the naphthalene method, the problems of clogging and explosion caused by naphthalene residue were solved, stable production was achieved, and safety hazards were eliminated.
Patent Information
- Application Number
- CN202520431337.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-12
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-03-12
AI Technical Summary
In the production of phthalic anhydride using the naphthalene process, naphthalene residue can easily cause blockage and explosion of the naphthalene-air mixer, resulting in damage to the production system and posing a safety hazard.
A cartridge filter and a centrifuge are installed between the naphthalene heater and the naphthalene evaporator. The filter removes solid impurities of ≥10 microns through the filter element, and the centrifuge separates naphthalene residue of ≥1 micron through conical discs, ensuring that the naphthalene vapor enters the naphthalene-air mixer with purity.
It effectively removes naphthalene residue, avoids clogging and explosion problems in the naphthalene-air mixer, and ensures production stability and safety.
Smart Images
Figure CN223861497U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a technical field of chemical equipment, concretely relates to a slag removal device in naphthalene method preparation phthalic anhydride production. BACKGROUND
[0002] In naphthalene method preparation phthalic anhydride process, industrial naphthalene is sent into naphthalene evaporator in molten state, industrial naphthalene is heated in naphthalene evaporator, and the naphthalene steam generated enters naphthalene-air mixer after metering, and the naphthalene steam is fully mixed with the preheated air in naphthalene-air mixer and enters the reactor, and the oxidation reaction occurs under the action of catalyst, and the required product phthalic anhydride and byproduct naphthoquinone, cis-anhydride are obtained, and phthalic anhydride product is obtained after separation and purification. However, in actual production, after industrial naphthalene is heated and evaporated, the naphthalene slag content is high, and the naphthalene slag will boil and turn over in the evaporator, and the naphthalene slag will enter the inside of naphthalene-air mixer along with the steam under the steam gas pressure, which will cause the filter inside naphthalene-air mixer to be seriously blocked, and secondly, since industrial naphthalene is a flammable and explosive substance, the residues accumulated in the filter at the bottom of naphthalene-air mixer may rub with hot air, heat and ignite, causing the blasting sheet to detonate, thereby causing the phthalic anhydride production system to be damaged and unable to produce normally. SUMMARY
[0003] The utility model solves the technical problem that a slag removal device in naphthalene method preparation phthalic anhydride production is provided, which overcomes the defects of the prior art, can eliminate the production hazards caused by naphthalene slag, and ensures stable production.
[0004] To solve the above technical problems, the technical scheme of the utility model is as follows:
[0005] A slag removal device in naphthalene method preparation phthalic anhydride production, which comprises a naphthalene heater, a filter, a centrifuge, a naphthalene evaporator and a naphthalene-air mixer connected in sequence through pipelines and valves; the filter is a cylindrical filter, comprising a cylindrical shell, a feed inlet is arranged at the bottom of the shell, a discharge outlet is arranged at the top of the shell, a detachable filter element is arranged in the shell, and the filter element is filled with a plurality of layers of filter material.
[0006] Preferably, the filter element is a polypropylene filter element, and the filter material is a plurality of layers of pleated polypropylene plate material. The filter area can be increased, and the filtering efficiency can be improved.
[0007] Preferably, the filter is a GXGL-10 model filter manufactured by Weifang Kangpuxi Energy-Saving Technology Co., Ltd.
[0008] Preferably, the disc is a conical disc, and the angle between the conical disc and the drum is 60 degrees.
[0009] Preferably, the centrifuge is model Z5E1 and manufactured by Jining Shanyou Environmental Protection Technology Co., Ltd.
[0010] Due to the adoption of the above technical solution, the beneficial effects of this utility model are:
[0011] This invention first installs a filter and a centrifuge between the naphthalene heater and the naphthalene evaporator. The filter effectively removes solid impurities with a particle size ≥10 micrometers from the liquid industrial naphthalene. Then, the centrifuge effectively separates and removes solid naphthalene slag with a particle size ≥1 micrometer from the liquid industrial naphthalene. In this way, the naphthalene vapor after slag removal will not cause blockage and explosion problems due to naphthalene slag when it enters the naphthalene-air mixer.
[0012] In summary, this invention can eliminate the production hazards caused by naphthalene residue and ensure stable production. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the equipment process according to an embodiment of the present utility model;
[0014] In the diagram, 1 is a naphthalene heater; 2 is a filter; 3 is a centrifuge; 4 is a naphthalene evaporator; and 5 is a naphthalene-air mixer. Detailed Implementation
[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0016] like Figure 1 As shown, a slag removal device in the production of phthalic anhydride using the naphthalene process includes a naphthalene heater 1, a filter 2, a centrifuge 3, a naphthalene evaporator 4, and a naphthalene-air mixer 5, which are connected in sequence through pipes (not shown) and valves (not shown). The filter 2 is a cylindrical filter, including a cylindrical shell (not shown), with an inlet (not shown) at the bottom and an outlet (not shown) at the top. A removable filter element (not shown) is provided inside the shell, and the filter element is filled with several layers of filter media (not shown). The centrifuge 3 has an inlet at the bottom and an outlet at the top. A rotating drum (not shown) is provided inside the centrifuge 3, and several sets of conical discs (not shown) are provided inside the rotating drum. The rotating drum is connected to a drive motor (not shown).
[0017] In actual production, the industrial naphthalene liquid heated by the naphthalene heater 1 is firstly introduced into the filter 2 from the feed port at the bottom of the filter 2. The filter 2 has a cylindrical shell made of 316L and a detachable top for replacing the internal filter core. The filter core is a polypropylene (PP) filter core with a multi-fold design for increasing the filtering area and improving the filtering efficiency. The industrial naphthalene liquid slowly penetrates upwards from the bottom of the filter 2 and is filtered by the filter material in the filter core, so that the solid impurities with a particle size of 10 microns or more in the liquid are isolated. The liquid is discharged from the discharge port at the top of the filter 2 and introduced into the centrifuge 3 for further separation. The centrifuge 3 is composed of a drum, a disc, a driving motor and the like. The drum is internally provided with a plurality of groups of conical discs for increasing the separation area. The industrial naphthalene liquid is introduced into the liquid tank from the bottom of the drum and then fills the entire drum cavity. The angle between the conical disc and the drum is 60 degrees. The driving motor drives the drum to rotate at a high speed. The naphthalene residues in the industrial naphthalene liquid are deposited on the surface of the disc under the action of centrifugal force, and the separated liquid industrial naphthalene flows upwards along the gap between the discs. The solid naphthalene residues with a particle size of 1 micron or more can be separated by centrifugation. The treated industrial naphthalene liquid is introduced into the naphthalene evaporator 4 for evaporation. After evaporation, the liquid is introduced into the naphthalene-air mixer 5, so that the problems of blockage and explosion do not occur, and the stability of production is ensured.
[0018] The naphthalene residues deposited on the drum and the disc during the treatment of the industrial naphthalene liquid can be cleaned by regular shutdown.
[0019] It should be understood that the embodiments are only used for illustrating the present application and are not used for limiting the scope of the present application. In addition, it should be understood that after reading the content taught by the present application, those skilled in the art can make various changes or modifications to the present application, and these equivalent forms also fall within the scope defined by the appended claims of the present application.
Claims
1. A slag removal device for the production of phthalic anhydride using the naphthalene process, characterized in that: The system includes a naphthalene heater, a filter, a centrifuge, a naphthalene evaporator, and a naphthalene-air mixer, which are connected in sequence via pipes and valves. The filter is a cylindrical filter, comprising a cylindrical shell with an inlet at the bottom and an outlet at the top. A removable filter element is located inside the shell, and the filter element is filled with several layers of filter media. The centrifuge has an inlet at the bottom and an outlet at the top. A rotating drum is located inside the centrifuge, and several sets of conical discs are located inside the drum. The rotating drum is connected to a drive motor.
2. The slag removal device in the naphthalene process for producing phthalic anhydride as described in claim 1, characterized in that: The filter element is a polypropylene filter element, and the filter material is a multi-layer pleated polypropylene sheet.
3. The slag removal device in the naphthalene process for producing phthalic anhydride as described in claim 1, characterized in that: The disc is a conical disc, and the angle between the conical disc and the drum is 60 degrees.