CN211921386U - Crude phthalic anhydride recovery device for phthalic anhydride residue steaming process - Google Patents
Crude phthalic anhydride recovery device for phthalic anhydride residue steaming process Download PDFInfo
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- CN211921386U CN211921386U CN202020410431.6U CN202020410431U CN211921386U CN 211921386 U CN211921386 U CN 211921386U CN 202020410431 U CN202020410431 U CN 202020410431U CN 211921386 U CN211921386 U CN 211921386U
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Abstract
The utility model belongs to the technical field of phthalic anhydride production, concretely relates to phthalic anhydride evaporates crude phthalic anhydride recovery unit of sediment process. Phthalic anhydride evaporate crude phthalic anhydride recovery unit of sediment process, including the material pipeline, the material pipeline be connected with the sediment cauldron of evaporating, evaporate and be equipped with the sediment reboiler in the sediment cauldron, evaporate sediment cauldron upper portion and nitrogen line connection, evaporate sediment cauldron bottom and be connected with the scum room through evaporating the sediment pipeline, evaporate sediment cauldron top and be equipped with the sediment tower of evaporating, evaporate the sediment cauldron and pass through the tube coupling with the sediment tower of evaporating, be equipped with the ripple packing in the sediment tower of evaporating, be equipped with the take-up (stock) pan on the ripple packing upper portion sediment tower inner wall of evaporating, the take-up pan passes through the recovery pipeline and is connected with the recovery tank, evaporate sediment top and evaporate the sediment condenser intercommunication, evaporate the sediment condenser and be connected with vacuum system. The utility model discloses can carry out rectification again to the crude phthalic anhydride in arranging the sediment operation, retrieve the phthalic anhydride component, reduce the production of solid wastes material, structure scientific and reasonable, simple easy operation.
Description
Technical Field
The utility model belongs to the technical field of phthalic anhydride production, concretely relates to phthalic anhydride evaporates crude phthalic anhydride recovery unit of sediment process.
Background
The naphthalene method phthalic anhydride production process mainly comprises an oxidation section and a refining section, wherein the oxidation section converts raw material naphthalene into crude phthalic anhydride, the components of the crude phthalic anhydride comprise maleic anhydride, benzoic acid, phthalic anhydride, naphthoquinone, phthalimide and the like, and relative to phthalic anhydride, the maleic anhydride and the benzoic acid are light components; naphthoquinone and phthalimide are heavy components; the refining section has two towers, light component tower to eliminate light component maleic anhydride and benzoic acid and finished product tower to eliminate heavy component naphthoquinone and phthalimide.
The refined phthalic anhydride product is extracted from the top of the finished product tower, and the heavy components are gradually enriched at the bottom of the tower. The enriched heavy fraction has mainly three adverse effects: (1) the quality of the refined phthalic anhydride product at the tower top is influenced, so that the color number of the product is deepened; (2) leading to blockage of the finished product tower reboiler and finished product tower packing; (3) increasing the consumption of steam. In order to eliminate the above three adverse effects, the slag discharge operation is required after a certain production period in the finished product tower process. Generally, each 3000 tons of refined phthalic anhydride is produced, one-time deslagging operation is needed, namely, the materials in the finished product tower are discharged into a deslagging chamber at one time, and after cooling and solidification, the materials are treated as hazardous wastes. However, the deslagging operation also has disadvantages: the crude phthalic anhydride discharged into the slag discharging chamber still contains at least 95 percent of phthalic anhydride; the slag discharge operation causes the waste of phthalic anhydride and increases the production of solid wastes.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the device overcomes the defects of the prior art, provides a crude phthalic anhydride recovery device in the phthalic anhydride residue steaming process, can re-rectify crude phthalic anhydride in the residue discharging operation, recovers phthalic anhydride components, and reduces the generation amount of solid wastes.
The utility model discloses an adopt following technical scheme to realize:
phthalic anhydride evaporate crude phthalic anhydride recovery unit of sediment process, including the material pipeline, the material pipeline be connected with the sediment cauldron of evaporating, evaporate and be equipped with the sediment reboiler in the sediment cauldron, evaporate sediment cauldron upper portion and nitrogen line connection, evaporate sediment cauldron bottom and be connected with the scum room through evaporating the sediment pipeline, evaporate sediment cauldron top and be equipped with the sediment tower of evaporating, evaporate the sediment cauldron and pass through the tube coupling with the sediment tower of evaporating, be equipped with the ripple packing in the sediment tower of evaporating, be equipped with the take-up (stock) pan on the ripple packing upper portion sediment tower inner wall of evaporating, the take-up pan passes through the recovery pipeline and is connected with the recovery tank, evaporate sediment top and evaporate the sediment condenser intercommunication, evaporate the sediment condenser and be connected with vacuum system.
The residue steaming kettle is used for storing crude phthalic anhydride discharged from a finished product tower through a material pipeline, a residue steaming reboiler is arranged in the residue steaming kettle and serves as a heat supply body of the whole rectification system, a heat source of the residue steaming reboiler can adopt 5.0MPa saturated steam or high-temperature heat conduction oil, and preferably, the residue steaming reboiler is connected with a 5.0MPa steam pipeline and a 5.0MPa condensate pipeline.
The slag steaming kettle is also provided with a thermometer for measuring the temperature in the slag steaming kettle, a liquid level meter for measuring the liquid level of materials in the slag steaming kettle, and a pressure gauge for displaying the pressure in the slag steaming kettle; evaporate sediment cauldron top and be provided with the nitrogen gas pipeline, the nitrogen gas pipeline mainly used: (1) extinguishing fire in abnormal conditions by using nitrogen as inert gas; (2) after the slag steaming is finished, pressurizing the slag steaming kettle by using nitrogen, pressing the residues subjected to slag steaming into a slag discharge chamber, and performing dangerous waste treatment after cooling and solidification.
Regular stainless steel corrugated packing is arranged in the residue steaming tower, the ascending gaseous material and the refluxing liquid material carry out mass transfer and heat transfer through the packing, and the total result causes the concentration of phthalic anhydride in ascending gas to rise and the concentration of heavy components in descending liquid to rise.
Preferably, a discharge sight glass is arranged on the recovery pipeline, and the recovery pipeline is connected with the recovery tank through a discharge U-shaped pipe. The height h1 of the pipeline at the emptying sight glass and the height h2 of the emptying U-shaped pipe are strictly calculated, and the height h1 ensures that the materials can overcome the highest vacuum degree of a slag steaming system and freely fall to a recovery tank; the height of h2 is to ensure that the discharge pipeline of the slag steaming system is not evacuated under the highest vacuum degree.
The receiving tray is used for receiving the liquid crude phthalic anhydride condensed and refluxed by the residue steaming condenser; the part of the liquid crude phthalic anhydride enters a recovery tank after passing through a discharge sight glass and a discharge U-shaped pipe, and then enters a refining section to produce refined phthalic anhydride. Along with the slag steaming operation, the concentration of heavy components in the slag steaming kettle is increased, and the content of phthalic anhydride is reduced; the color of the crude phthalic anhydride received by the receiving disc can be gradually deepened, and the receiving amount can be reduced; the color change of the crude phthalic anhydride and the material receiving amount can be observed through a discharging sight glass, and whether the slag steaming operation is carried out to the end point is judged.
Preferably, the slag steaming condenser is connected with the steam flash tank through a steam production pipeline, and the bottom of the steam flash tank is connected with the slag steaming condenser through a water replenishing pipeline. The steam flash tank on be equipped with level gauge and manometer, steam flash tank moisturizing mouth department is equipped with the ionized water moisturizing valves, steam flash tank top steam outlet department is equipped with the steam and sends the valves outward, the level gauge is connected with ionized water moisturizing valves electricity, the manometer sends the valves electricity outward with steam and is connected. The deionized water replenishing valve group and the liquid level meter can realize automatic control of the liquid level and ensure the stable liquid level of the steam flash tank; the steam delivery valve group and the pressure gauge can realize automatic control of pressure, and stable pressure of the steam flash tank is guaranteed. The temperature of the outlet of the slag steaming condenser can be adjusted by adjusting the pressure of the steam flash tank.
The slag steaming condenser is preferably a shell-and-tube heat exchanger which is arranged at the top of the slag steaming tower. The gaseous phthalic anhydride material is subjected to heat exchange condensation with high-temperature water in the shell pass through the tube pass, part of condensed liquid phthalic anhydride is extracted through the material receiving disc, and part of condensed liquid phthalic anhydride is refluxed through the residue steaming tower. The bottom of the shell pass of the condenser is connected with a steam flash tank through a water replenishing pipeline; the top of the shell pass is connected with a steam flash tank through a steam production pipeline. The steam flash tank, the water replenishing pipeline, the residue steaming condenser and the steam production pipeline form siphon circulation, and continuous water replenishing and continuous steam discharging of the shell pass are ensured.
The residue steaming condenser is connected with a vacuum system through a pipeline. The vacuum system provides a stable negative pressure state for the whole slag steaming process, and a small amount of uncondensed gaseous materials and non-condensable gas can be discharged through the vacuum system.
When the device works, the operation procedures are as follows:
1. feeding: starting a vacuum system, and keeping the slag steaming procedure in a negative pressure state required by the process; putting crude phthalic anhydride discharged by slag discharge operation into a slag steaming kettle to a certain liquid level through a material pipeline;
2. and (3) heating: starting a heating source of the slag steaming reboiler to heat a slag steaming system;
3. and (3) extracting: along with the rise of the temperature, the gaseous material gradually rises to the top of the slag steaming tower, and at the moment, a water injection valve of a slag steaming condenser needs to be opened to condense and reflux the gaseous material; a small part of materials are put into a recovery tank through a material receiving disc, a material discharging sight glass and a material discharging U-shaped pipe; the other part of the reflux material transfers heat and mass with the ascending gaseous material;
4. pressing slag: along with the extraction of the phthalic anhydride component at the top of the tower, the phthalic anhydride component in the residue steaming kettle is reduced, the content of heavy components is increased, and the viscosity of the material is continuously increased. Generally, when the content of the phthalic anhydride component is reduced to about 30-35 percent, slag pressing is needed; and during slag pressing, stopping a heat source of the slag steaming reboiler, stopping water supplement of the slag steaming condenser, stopping a vacuum system, pressurizing the slag steaming kettle through a nitrogen pipeline, discharging the residual materials into a slag discharging chamber from a slag pressing pipeline, and cleaning and transporting the residual materials outside after cooling and curing.
After the four steps, the slag steaming process completes one production cycle.
Compared with the prior art, the beneficial effects of the utility model are as follows:
the utility model discloses can carry out rectification again to the crude phthalic anhydride in arranging the sediment operation, retrieve the phthalic anhydride component, reduce the production of solid wastes material, structure scientific and reasonable, simple easy operation.
Drawings
Fig. 1 is a schematic structural view of the present invention;
in the figure: 1. a nitrogen line; 2. a material line; 3. a steam line; 4. a water condensation line; 5. a residue steaming reboiler; 6. a slag steaming kettle; 7. a slag steaming pipeline; 8. a slag discharge chamber; 9. a slag steaming tower; 10. corrugated packing; 11. a take-up pan; 12. a slag steaming condenser; 13. a recovery pipeline; 14. a material placing sight glass; 15. discharging a U-shaped pipe; 16. a recovery tank; 17. a vacuum system; 18. a steam delivery valve bank; 19. a steam production pipeline; 20. a pressure gauge; 21. a water replenishing pipeline; 22. a steam flash tank; 23. a liquid level meter; 24. deionized water moisturizing valves.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the crude phthalic anhydride recovery device for phthalic anhydride residue steaming process comprises a material pipeline 2, the material pipeline 2 is connected with a residue steaming kettle 6, a residue steaming reboiler 5 is arranged in the residue steaming kettle 6, the upper part of the residue steaming kettle 6 is connected with a nitrogen pipeline 1, the bottom of the residue steaming kettle 6 is connected with a residue discharge chamber 8 through a residue steaming pipeline 7, a residue steaming tower 9 is arranged at the top of the residue steaming kettle 6, the residue steaming kettle 6 is connected with the residue steaming tower 9 through a pipeline, corrugated fillers 10 are arranged in the residue steaming tower 9, a receiving disc 11 is arranged on the inner wall of the residue steaming tower 9 on the upper parts of the corrugated fillers 10, the receiving disc 11 is connected with a recovery tank 16 through a recovery pipeline 13 and a discharging U-shaped pipe 15, a discharging viewing mirror 14 is arranged on the recovery pipeline 13, the top of the residue steaming tower 9 is communicated with a residue steaming condenser 12, and the residue steaming condenser 12 is connected with.
The residue steaming reboiler 5 is connected with the steam pipeline 3 and the condensate pipeline 4.
The slag steaming condenser 12 is connected with a steam flash tank 22 through a steam production pipeline 19, and the bottom of the steam flash tank 22 is connected with the slag steaming condenser 12 through a water supplementing pipeline 21.
When the device works, the operation procedures are as follows:
1. feeding: starting a vacuum system 17, and keeping the slag steaming process in a negative pressure state required by the process; crude phthalic anhydride discharged by the slag discharging operation is put into a slag steaming kettle 6 to a certain liquid level through a material pipeline 2;
2. and (3) heating: starting a heating source of a slag steaming reboiler 5, opening valves on a steam pipeline 3 and a condensate pipeline 4, and introducing 5MPa steam to heat a slag steaming system;
3. and (3) extracting: along with the rise of the temperature, the gaseous material gradually rises to the slag steaming tower 9, the gaseous material rises to the top of the slag steaming tower 9 through the stainless steel corrugated packing 10, and at the moment, valves on a water replenishing pipeline 21 and a steam production pipeline 19 which are connected with the slag steaming condenser 12 are opened to condense and reflux the gaseous material; a small part of materials are put into a recovery tank 16 through a receiving tray 11, a recovery pipeline 13, a discharging sight glass 14 and a discharging U-shaped pipe 15; the other part of the reflux material transfers heat and mass with the ascending gaseous material;
4. pressing slag: along with the extraction of the phthalic anhydride component at the tower top, the phthalic anhydride component in the residue steaming kettle 6 is reduced, the content of heavy components is increased, and the viscosity of the material is continuously increased. Pressing slag when the content of the phthalic anhydride component is reduced to 35 percent; and during slag pressing, stopping a heat source of the slag steaming reboiler 5, stopping water supplement of the slag steaming condenser 12, stopping the vacuum system 17, pressurizing the slag steaming kettle 6 through the nitrogen pipeline 1, discharging the residual materials into the slag discharging chamber 8 through the slag pressing pipeline 7, cooling, solidifying, cleaning and transporting the residual materials.
After the four steps, the slag steaming process completes one production cycle.
Of course, the above description is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the embodiments of the present invention. The present invention is not limited to the above examples, and the technical field of the present invention is equivalent to the changes and improvements made in the actual range of the present invention, which should be attributed to the patent coverage of the present invention.
Claims (5)
1. The utility model provides a phthalic anhydride evaporates crude phthalic anhydride recovery unit of sediment process, includes material pipeline (2), its characterized in that: material pipeline (2) be connected with evaporate sediment cauldron (6), be equipped with in evaporate sediment cauldron (6) and evaporate sediment reboiler (5), evaporate sediment cauldron (6) upper portion is connected with nitrogen pipeline (1), evaporate sediment cauldron (6) bottom is connected with row cinder room (8) through evaporating sediment pipeline (7), evaporate sediment cauldron (6) top is equipped with evaporates sediment tower (9), evaporates sediment cauldron (6) and passes through the tube coupling with evaporate sediment tower (9), be equipped with ripple filler (10) in evaporating sediment tower (9), be equipped with take-up (11) on ripple filler (10) upper portion evaporate sediment tower (9) inner wall, take-up (11) are connected with recovery tank (16) through recovery pipeline (13), evaporate sediment tower (9) top and evaporate sediment condenser (12) intercommunication, evaporate sediment condenser (12) and be connected with vacuum system (17).
2. The crude phthalic anhydride recovery device in the phthalic anhydride residue steaming process according to claim 1, comprising: the residue steaming reboiler (5) is connected with the steam pipeline (3) and the condensed water pipeline (4).
3. The crude phthalic anhydride recovery device in the phthalic anhydride residue steaming process according to claim 1, comprising: the recycling pipeline (13) is provided with a discharging sight glass (14), and the recycling pipeline (13) is connected with a recycling tank (16) through a discharging U-shaped pipe (15).
4. The crude phthalic anhydride recovery device in the phthalic anhydride residue steaming process according to claim 1, comprising: the slag steaming condenser (12) is connected with a steam flash tank (22) through a steam production pipeline (19), and the bottom of the steam flash tank (22) is connected with the slag steaming condenser (12) through a water replenishing pipeline (21).
5. The crude phthalic anhydride recovery device in the phthalic anhydride residue steaming process according to claim 4, wherein: steam flash tank (22) on be equipped with level gauge (23) and manometer (20), steam flash tank (22) moisturizing mouth department is equipped with deionized water moisturizing valves (24), steam flash tank (22) top steam outlet department is equipped with steam and sends valves (18) outward, level gauge (23) are connected with deionized water moisturizing valves (24) electricity, manometer (20) send valves (18) electricity outward with steam and are connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020410431.6U CN211921386U (en) | 2020-03-26 | 2020-03-26 | Crude phthalic anhydride recovery device for phthalic anhydride residue steaming process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020410431.6U CN211921386U (en) | 2020-03-26 | 2020-03-26 | Crude phthalic anhydride recovery device for phthalic anhydride residue steaming process |
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| CN211921386U true CN211921386U (en) | 2020-11-13 |
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| CN202020410431.6U Active CN211921386U (en) | 2020-03-26 | 2020-03-26 | Crude phthalic anhydride recovery device for phthalic anhydride residue steaming process |
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