CN113248469A - Trioxymethylene recovery system and process - Google Patents
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- CN113248469A CN113248469A CN202110368361.1A CN202110368361A CN113248469A CN 113248469 A CN113248469 A CN 113248469A CN 202110368361 A CN202110368361 A CN 202110368361A CN 113248469 A CN113248469 A CN 113248469A
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Abstract
The invention relates to the technical field of chemical recovery, in particular to a trioxymethylene recovery system and a trioxymethylene recovery process. The system comprises: synthetic reation kettle, trioxymethylene rectifying column, extraction rectifying column, top of the tower layering ware, benzene storage tank, thin aldehyde recovery siding, bottom of the tower layering ware, take off light tower, its characterized in that: recovering diluted aldehyde from a side line and outputting the diluted aldehyde to a tower top delayer; the system can realize the high-efficiency recovery of the trioxymethylene and improve the output of the trioxymethylene; meanwhile, the process avoids the side reaction of the trioxymethylene and ensures the purity of the trioxymethylene product; the method has the advantages of simple and reasonable flow design, strong operability, no additional equipment and the like, and realizes the high-efficiency recovery of the trioxymethylene to the maximum extent.
Description
Technical Field
The invention relates to the technical field of chemical recovery, in particular to a trioxymethylene recovery system and a trioxymethylene recovery process.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
Polyoxymethylene (POM) is one of five engineering plastics widely used at present, trioxymethylene is an important intermediate of polyoxymethylene (C)3H6O3) Is prepared from formaldehyde (CH) under the catalysis of sulfuric acid2O) is synthesized in a large vertical container reaction kettle, and polymer-grade trioxymethylene is obtained through synthetic rectification, extractive rectification, light and heavy removal and the like.
Dilute aldehyde waste liquid (methanol: 3%, trioxymethylene: 8%, formaldehyde: 18%, benzene 10%, etc.) generated in the production process of polyformaldehyde is sent to a dilute aldehyde storage tank, and the formaldehyde and trioxymethylene are recovered through a dilute aldehyde recovery device.
The dilute aldehyde recovery device has two main devices: a formaldehyde separation tower and a formaldehyde recovery tower. The formaldehyde separation tower mainly has the main functions of separating methanol (at the top of the tower) and formaldehyde (at the bottom of the tower), simultaneously collecting more than 60% of trioxymethylene at a side line, controlling the temperature of a tower tray at the middle part of the tower to be 99-100 ℃ in order to ensure the quality of trioxymethylene collected at the side line, controlling the flow of trioxymethylene collected at the side line by a regulating valve, and sending the trioxymethylene into a trioxymethylene reaction kettle for re-reaction.
The inventors have found that the trioxymethylene recovery process has the following problems:
(1) formaldehyde (CH)2O) is heated in a large vertical container reaction kettle under the catalysis of sulfuric acid to generate trimerization cyclization reaction, and trioxymethylene is generated. Since the trimerization reaction is a reversible reaction, it is necessary to convert the product from reverseThe reaction liquid is evaporated, the balance is moved to the direction of the product, and after the high-concentration trioxymethylene extracted from the side line of the dilute aldehyde recovery system enters the reaction kettle, the reaction balance is influenced to move leftwards, so that the conversion rate of trioxymethylene synthesis is reduced.
(2) The content of methanol in the trioxymethylene at the side line of the dilute aldehyde recovery system is 1.5-2.0%, and the methanol can generate a byproduct polymethoxy dimethyl ether (CH) in a trioxymethylene synthesis reaction kettle3O-CH2-OCH3) The boiling points of the polymethoxy dimethyl ether and the trioxymethylene are close, so that the polymethoxy dimethyl ether and the trioxymethylene are difficult to remove in the subsequent process, and if the polymethoxy dimethyl ether and the trioxymethylene continuously enter a reaction kettle to recover the trioxymethylene, the purity of the trioxymethylene product is seriously influenced. The side reaction equation is as follows:
therefore, the existing trioxymethylene recovery system and process still have a series of problems of low conversion rate, high by-product content and the like, so that a new trioxymethylene recovery system and process need to be researched.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides the trioxymethylene recovery system and the trioxymethylene recovery process, which can realize high-efficiency recovery of trioxymethylene and improve the output of the trioxymethylene; meanwhile, the process avoids the side reaction of the trioxymethylene and ensures the purity of the trioxymethylene product; the method has the advantages of simple and reasonable flow design, strong operability, no additional equipment and the like, and realizes the high-efficiency recovery of the trioxymethylene to the maximum extent.
In order to achieve the above object, a first aspect of the present invention provides a trioxymethylene recovery system, which specifically includes: a synthesis reaction kettle, a trioxymethylene rectifying tower, an extractive rectifying tower, a tower top delayer, a benzene storage tank, a dilute aldehyde recovery side line, a tower bottom delayer and a light component removal tower; wherein, dilute aldehyde is recovered from the side line and is extracted to a tower top delayer;
the trioxymethylene gas-phase reaction material generated in the synthesis reaction kettle enters the lower part of a trioxymethylene rectifying tower, and after rectification, mixed gas rich in trioxymethylene flows out of the top of the rectifying tower and enters the lower part of an extraction rectifying tower to carry out extraction absorption of the trioxymethylene; and (3) allowing gas flowing out of the top of the extraction and rectification tower to enter a tower top delayer for layering, and collecting upper-layer light-phase components into a benzene storage tank. And (2) conveying the trioxymethylene recovered from the dilute aldehyde recovery side line to a tower top delayer, overflowing the benzene solution of the trioxymethylene to a benzene storage tank in the delayer, pumping and transferring to an extraction rectifying tower for mixed extraction, extracting the mixed solution from the tower bottom, allowing the mixed solution to enter the tower bottom delayer for layering to obtain a light phase solution, and treating the light phase solution by a light phase removal tower to obtain a trioxymethylene product.
The second aspect of the invention provides a process for recovering trioxymethylene by using the system, which specifically comprises the following steps:
(1) rectifying the trioxymethylene mixed gas: putting the trioxymethylene gas-phase reaction material generated in the synthesis reaction kettle into the lower part of a trioxymethylene rectifying tower, and after rectification, obtaining mixed gas rich in trioxymethylene from the top of the rectifying tower;
(2) extracting trioxymethylene: and (3) sending the mixed gas which flows out of the trioxymethylene rectifying tower and is rich in trioxymethylene into the lower part of the extraction rectifying tower for extraction and absorption of trioxymethylene, sending the gas at the top of the extraction rectifying tower into a tower top delayer for layering, and collecting the upper layer light phase component into a benzene storage tank.
(3) Recovering trioxymethylene in a dilute aldehyde recovery side line: the trioxymethylene recovered from the dilute aldehyde recovery side line is sent to a tower top delayer, benzene solution of the trioxymethylene overflows to a benzene storage tank in the delayer, and is transferred to an extraction rectifying tower through a pump for mixed extraction;
(4) and (3) allowing the product at the bottom of the tower after mixed extraction to enter a tower bottom delayer for standing and layering, delivering the light-phase solution (benzene solution of trioxymethylene) to a trioxymethylene-benzene mixed storage tank, treating the light-phase solution by a light removal tower to obtain a qualified trioxymethylene product, collecting the heavy-phase solution (dilute aldehyde aqueous solution) to a dilute aldehyde storage tank, and delivering the heavy-phase solution (dilute aldehyde aqueous solution) to a dilute aldehyde recovery unit for treatment.
One or more embodiments of the present invention have at least the following advantageous effects:
(1) according to the trioxymethylene recovery system and the trioxymethylene recovery process, the dilute aldehyde is recovered from the side line to the tower top delayer, so that the trioxymethylene recovery efficiency can reach 0.8t/h, the high-efficiency recovery of the trioxymethylene is realized, the trioxymethylene yield is improved, the occurrence of a trioxymethylene side reaction is avoided, and the purity of the trioxymethylene product is ensured.
(2) The method has the advantages of simple and reasonable flow design, strong operability, no additional equipment and the like, and realizes the high-efficiency recovery of the trioxymethylene to the maximum extent.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic view of a trioxymethylene recovery system provided in example 1 of the present invention;
wherein: 1-synthesis reaction kettle; 2-trioxymethylene rectifying tower; 3-extractive distillation column; 4-overhead condenser; 5-a tower top delayer; 6-benzene storage tank; 7-dilute aldehyde recovery side line; 8-jacket heat tracing pipeline; 9-tower bottom delayer; a 10-dilute aldehyde storage tank; 11-a mixed storage tank for trioxymethylene and benzene; 12-a first lightness-removing column; 13-second lightness-removing tower.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As described in the background art, the existing trioxymethylene recovery system and process still have a series of problems of low conversion rate, high by-product content and the like, and in order to solve the above technical problems, the invention provides a trioxymethylene recovery system in a first aspect, which specifically comprises: a synthesis reaction kettle, a trioxymethylene rectifying tower, an extractive rectifying tower, a tower top delayer, a benzene storage tank, a dilute aldehyde recovery side line, a tower bottom delayer and a light component removal tower; wherein, dilute aldehyde is recovered from the side line and is extracted to a tower top delayer;
the trioxymethylene gas-phase reaction material generated in the synthesis reaction kettle enters the lower part of a trioxymethylene rectifying tower, and after rectification, mixed gas rich in trioxymethylene flows out of the top of the rectifying tower and enters the lower part of an extraction rectifying tower to carry out extraction absorption of the trioxymethylene; and (3) allowing gas flowing out of the top of the extraction and rectification tower to enter a tower top delayer for layering, and collecting upper-layer light-phase components into a benzene storage tank. And (2) conveying the trioxymethylene recovered from the dilute aldehyde recovery side line to a tower top delayer, overflowing the benzene solution of the trioxymethylene to a benzene storage tank in the delayer, pumping and transferring to an extraction rectifying tower for mixed extraction, extracting the mixed solution from the tower bottom, allowing the mixed solution to enter the tower bottom delayer for layering to obtain a light phase solution, and treating the light phase solution by a light phase removal tower to obtain a trioxymethylene product.
According to the invention, the trioxymethylene recovered from the dilute aldehyde recovery side line is sent to the tower top delayer instead of the tower bottom delayer, because the components in the tower bottom delayer and the tower top delayer are different, the benzene content in the light phase of the tower bottom delayer is 75%, the trioxymethylene content is 25%, and the trioxymethylene is nearly saturated in the benzene; if the dilute aldehyde is recovered from the side line and is extracted to the tower bottom delayer, a very small amount of trioxymethylene is dissolved into benzene, and the recovery rate of trioxymethylene is low; the dilute aldehyde is recovered from the side line and is extracted to a tower top delayer, and the trioxymethylene recovery efficiency can reach 0.8 t/h.
In one or more embodiments of the invention, the gas at the top of the extractive distillation column enters an overhead delayer for layering after being condensed by an overhead condenser.
In one or more embodiments of the invention, the trioxymethylene solution from the dilute aldehyde recovery side draw is a mixed aqueous solution of trioxymethylene, methanol, and formaldehyde, wherein the formaldehyde content is 13% -14%, the methanol content is 4% -5%, the water content is 25% -28%, and the trioxymethylene content is 55% -58%.
In one or more embodiments of the invention, a jacket heat tracing pipeline is adopted from the dilute aldehyde recovery side line to the top delayer pipeline of the extractive distillation tower, so that the pipeline is prevented from being blocked, and a 95 ℃ hot water flushing pipeline is arranged at the root of the dilute aldehyde recovery side line and is used for process treatment and pipeline dredging during parking.
In one or more embodiments of the invention, the tower bottom delayer is further connected with a mixed storage tank for trioxymethylene and benzene, and a dilute aldehyde storage tank, the heavy phase solution separated by the tower top delayer is collected in the dilute aldehyde storage tank, and the light phase solution is collected in the mixed storage tank for trioxymethylene and benzene, and then is treated by the light component removal tower to obtain the trioxymethylene product.
In one or more embodiments of the invention, the light component removal tower comprises a first light component removal tower and a second light component removal tower, and the feed pump is conveyed to the first light component removal tower to separate benzene and trioxymethylene and then passes through the second light component removal tower.
The second aspect of the invention provides a process for recovering trioxymethylene by using the system, which specifically comprises the following steps:
(1) rectifying the trioxymethylene mixed gas: putting the trioxymethylene gas-phase reaction material generated in the synthesis reaction kettle into the lower part of a trioxymethylene rectifying tower, and after rectification, obtaining mixed gas rich in trioxymethylene from the top of the rectifying tower;
after the gaseous trioxymethylene reaction material enters the lower part of a trioxymethylene rectifying tower, heat-mass exchange is carried out between the gaseous trioxymethylene reaction material and reflux liquid from a reflux pump along the rising of the tower under a vacuum system, so that formaldehyde and water with lower volatility are condensed in the tower, and volatile components such as trioxymethylene in the liquid flowing down along the tower are heated and gasified by gas, so that the concentration of trioxymethylene in the upper-layer gas-liquid phase composition in the tower is gradually increased, and mixed gas rich in trioxymethylene is formed.
(2) Extracting trioxymethylene: and (3) sending the mixed gas which flows out of the trioxymethylene rectifying tower and is rich in trioxymethylene into the lower part of the extraction rectifying tower for extraction and absorption of trioxymethylene, sending the gas at the top of the extraction rectifying tower into a tower top delayer for layering, and collecting the upper layer light phase component into a benzene storage tank.
Preferably, benzene with the temperature of 50 ℃ is adopted as an extracting agent in the extraction rectifying tower, and the benzene is pressurized by a reflux pump and sprayed from the upper part of the tower; so that the trioxymethylene in the reaction gas in the tower is absorbed by the benzene, and the trioxymethylene in the reaction gas is continuously extracted by the benzene liquid in the process that the reaction gas is cooled by the benzene and partially condensed into liquid flowing down along the tower tray;
the gas composition at the top of the extraction and rectification tower is as follows: 87% of benzene, and the balance of water, formaldehyde and other components are condensed by a tower top condenser and then enter a tower top delayer for layering, and the upper layer light phase component is benzene, so that the benzene is collected in a benzene storage tank.
(3) Recovering trioxymethylene in a dilute aldehyde recovery side line: the trioxymethylene solution recovered from the dilute aldehyde recovery side line is sent to a tower top delayer, the benzene solution of trioxymethylene overflows to a benzene storage tank in the delayer, and is transferred to an extraction rectifying tower through a pump for mixed extraction;
according to the characteristics of different material specific gravities and mutual incompatibility of benzene and water, in the trioxymethylene solution collected from the side line of dilute aldehyde recovery, 85% of trioxymethylene and benzene are mixed to form a light phase (benzene solution of trioxymethylene), methanol, formaldehyde and about 15% of trioxymethylene and water form a heavy phase (dilute aldehyde water solution), and the benzene solution of trioxymethylene overflows to a benzene storage tank in a delayer and is transferred to an extraction rectifying tower through a pump to be mixed and extracted therein.
(4) And (3) allowing the product at the bottom of the tower after mixed extraction to enter a tower bottom delayer for standing and layering, delivering the light-phase solution (benzene solution of trioxymethylene) to a trioxymethylene-benzene mixed storage tank, treating the light-phase solution by a light removal tower to obtain a qualified trioxymethylene product, collecting the heavy-phase solution (dilute aldehyde aqueous solution) to a dilute aldehyde storage tank, and delivering the heavy-phase solution (dilute aldehyde aqueous solution) to a dilute aldehyde recovery unit for treatment.
In one or more embodiments of the invention, the overhead, bottom, delayer pressure is-10 KPa.
In one or more embodiments of the invention, the dilute aldehyde recovery side stream pressure is 10KPa, and the trioxymethylene solution taken from the dilute aldehyde recovery side stream enters the overhead delayer through a regulating valve flow meter.
In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the technical solutions of the present invention will be described in detail below with reference to specific embodiments.
Example 1
A trioxymethylene recovery system, comprising: a synthesis reaction kettle 1, a trioxymethylene rectifying tower 2 and an extraction rectifying tower 3; the trioxymethylene gas-phase reaction material generated in the synthesis reaction kettle 1 enters the lower part of a trioxymethylene rectifying tower 2, flows out mixed gas rich in trioxymethylene from the top of the rectifying tower after rectification, and enters the lower part of an extraction rectifying tower 3 for extraction and absorption of trioxymethylene; condensing gas flowing out of the top of the extractive distillation column 3 through a tower top condenser 4, then allowing the gas to enter a tower top delayer 5 for layering, and collecting upper layer light phase components into a benzene storage tank 6; the trioxymethylene solution extracted from a dilute aldehyde recovery side line 7 is sent to a tower top delayer 5 through a jacket heat tracing pipeline 8, the benzene solution of trioxymethylene overflows to a benzene storage tank 6 in the tower top delayer 5, then the benzene solution is pumped and transferred to an extraction rectifying tower 3 for mixed extraction, the mixed solution is extracted from the tower bottom and enters a tower bottom delayer 9 for layering, the obtained heavy component is collected in a dilute aldehyde storage tank 10, the light phase solution is collected in a mixed storage tank 11 of trioxymethylene and benzene, and then the light phase solution is sequentially treated by a first light-removing tower 12 and a second light-removing tower 13 to obtain a trioxymethylene product.
Example 2
The system in example 1 was used for trioxymethylene recovery process:
in the synthesis reaction kettle, trioxymethylene is synthesized from formaldehyde under the catalysis of sulfuric acid, trioxymethylene gas-phase reaction materials generated by the synthesis reaction kettle enter the lower part of a trioxymethylene rectifying tower, heat and mass exchange is carried out between the trioxymethylene gas-phase reaction materials and reflux liquid from a reflux pump along the rising of the tower under the vacuum system, so that formaldehyde and water with lower volatility are condensed in the tower, meanwhile, volatile components such as trioxymethylene in the liquid flowing down along the tower are heated and gasified by gas, and the concentration of trioxymethylene in the gas-liquid-phase composition at the upper layer in the tower is gradually increased.
The mixed gas which is rich in trioxymethylene and comes from the trioxymethylene rectifying tower enters the lower part of the extraction rectifying tower and flows upwards along the tower tray; the extractant benzene at 50 ℃ is pressurized by a benzene reflux pump and sprayed from the upper part of the tower; in the process that trioxymethylene in reaction gas in the tower is absorbed by benzene, and meanwhile, the reaction gas is cooled by the benzene and partially condensed into liquid flowing down along a tower tray, the trioxymethylene in the reaction gas is continuously extracted by benzene liquid; the top gas (87% benzene, the rest is water, formaldehyde and other components) of the extraction and rectification tower is condensed by a tower top condenser and then enters a tower top delayer for layering, and the upper light phase component is benzene. And recovering diluted aldehyde from a side line, extracting to a tower top delayer, overflowing benzene solution of trioxymethylene to a benzene storage tank in the delayer, transferring to an extraction rectifying tower through a pump, carrying out mixed extraction in the extraction rectifying tower, allowing mixed solution to flow down along a tower tray, and allowing the mixed solution to enter a tower bottom delayer for standing and layering. In the delayer, light phase (benzene solution of trioxymethylene) and heavy phase (dilute aldehyde aqueous solution) are formed due to the characteristics of different material specific gravities and mutual incompatibility of benzene and water. Sending the light phase solution to a mixed storage tank of trioxymethylene and benzene, separating the benzene and the trioxymethylene through a first light component removing tower, and removing light components through a second light component removing tower to produce qualified trioxymethylene; and the heavy phase is collected in a dilute aldehyde storage tank and sent to a dilute aldehyde recovery unit for treatment.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A trioxymethylene recovery system, comprising: synthetic reation kettle, trioxymethylene rectifying column, extraction rectifying column, top of the tower layering ware, benzene storage tank, thin aldehyde recovery siding, bottom of the tower layering ware, take off light tower, its characterized in that: recovering diluted aldehyde from a side line and outputting the diluted aldehyde to a tower top delayer;
the trioxymethylene gas-phase reaction material generated in the synthesis reaction kettle enters the lower part of a trioxymethylene rectifying tower, and after rectification, mixed gas rich in trioxymethylene flows out of the top of the rectifying tower and enters the lower part of an extraction rectifying tower to carry out extraction absorption of the trioxymethylene; the gas flowing out of the top of the extraction rectifying tower enters a tower top delayer for layering, and the upper layer light phase component is collected into a benzene storage tank; and (2) delivering the trioxymethylene solution recovered from the dilute aldehyde recovery side line to a tower top delayer, overflowing the benzene solution of trioxymethylene to a benzene storage tank in the delayer, pumping and transferring to an extraction rectifying tower for mixed extraction, extracting the mixed solution from the tower bottom, allowing the mixed solution to enter the tower bottom delayer for layering to obtain a light phase solution, and treating the light phase solution by a light phase removal tower to obtain a trioxymethylene product.
2. A trioxymethylene recovery system as set forth in claim 1, wherein: and the gas at the top of the extraction rectifying tower is condensed by a tower top condenser and then enters a tower top delayer for layering.
3. A trioxymethylene recovery system as set forth in claim 1, wherein: the trioxymethylene solution recovered from the dilute aldehyde recovery side line is a mixed aqueous solution of trioxymethylene, methanol and formaldehyde, wherein the content of formaldehyde is 13-14%, the content of methanol is 4-5%, the content of water is 25-28%, and the content of trioxymethylene is 55-58%.
4. A trioxymethylene recovery system as set forth in claim 1, wherein: a pipeline from the dilute aldehyde recovery side line to a layering device at the top of the extraction rectification tower adopts a jacket heat tracing pipeline to prevent the pipeline from being blocked, and meanwhile, a 95 ℃ hot water flushing pipeline is arranged at the root of the dilute aldehyde recovery extraction, and is used for process treatment and pipeline dredging during parking.
5. A trioxymethylene recovery system as set forth in claim 1, wherein: the tower bottom delayer is also connected with a mixed storage tank of trioxymethylene and benzene and a dilute aldehyde storage tank, the heavy phase solution obtained by the separation of the tower top delayer is collected in the dilute aldehyde storage tank, the light phase solution is collected in the mixed storage tank of trioxymethylene and benzene firstly, and then the trioxymethylene product is obtained by the treatment of a light component removing tower.
6. A trioxymethylene recovery system as set forth in claim 1, wherein: the light component removing tower comprises a first light component removing tower and a second light component removing tower, and a feeding pump is used for conveying the light component removing tower to the first light component removing tower to separate benzene and trioxymethylene and then to the second light component removing tower.
7. A process for trioxymethylene recovery employing the system of any one of claims 1 to 6, characterized in that: the method specifically comprises the following steps:
(1) rectifying the trioxymethylene mixed gas: putting the trioxymethylene gas-phase reaction material generated in the synthesis reaction kettle into the lower part of a trioxymethylene rectifying tower, and after rectification, obtaining mixed gas rich in trioxymethylene from the top of the rectifying tower;
(2) extracting trioxymethylene: sending mixed gas which flows out of a trioxymethylene rectifying tower and is rich in trioxymethylene into the lower part of an extraction rectifying tower for extraction and absorption of trioxymethylene, sending gas at the top of the extraction rectifying tower into a tower top delayer for layering, and collecting upper-layer light-phase components into a benzene storage tank;
(3) recovering trioxymethylene in a dilute aldehyde recovery side line: the trioxymethylene recovered from the dilute aldehyde recovery side line is sent to a tower top delayer, benzene solution of the trioxymethylene overflows to a benzene storage tank in the delayer, and is transferred to an extraction rectifying tower through a pump for mixed extraction;
(4) and (3) allowing the product at the bottom of the tower after mixed extraction to enter a tower bottom delayer for standing and layering, allowing the light-phase solution to be sent to a trioxymethylene and benzene mixed storage tank, treating the light-phase solution by a light removal tower to obtain a qualified trioxymethylene product, collecting the heavy-phase solution to a dilute aldehyde storage tank, and sending the heavy-phase solution to a dilute aldehyde recovery unit for treatment.
8. The process of claim 7, wherein: the pressure of the tower top and tower bottom delayer is-10 KPa.
9. The process of claim 7, wherein: the dilute aldehyde recovery side line pressure is 10 KPa.
10. The process of claim 7, wherein: the trioxymethylene solution collected from the dilute aldehyde recovery side line enters a tower top delayer through a regulating valve flowmeter.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116947807A (en) * | 2023-06-28 | 2023-10-27 | 江苏道尔顿石化科技有限公司 | Fluidized bed synthesis trioxymethylene and trioxymethylene refining process |
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