CN118267735A - Method for recovering BDO and inhibiting BDO hydrogenation side reaction by GBL device - Google Patents
Method for recovering BDO and inhibiting BDO hydrogenation side reaction by GBL device Download PDFInfo
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- CN118267735A CN118267735A CN202410373497.5A CN202410373497A CN118267735A CN 118267735 A CN118267735 A CN 118267735A CN 202410373497 A CN202410373497 A CN 202410373497A CN 118267735 A CN118267735 A CN 118267735A
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- 238000005984 hydrogenation reaction Methods 0.000 title claims abstract description 58
- 238000007086 side reaction Methods 0.000 title claims abstract description 34
- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000009835 boiling Methods 0.000 claims abstract description 24
- 238000004064 recycling Methods 0.000 claims abstract description 11
- 238000006356 dehydrogenation reaction Methods 0.000 claims abstract description 6
- 229920000642 polymer Polymers 0.000 claims abstract description 6
- 238000011084 recovery Methods 0.000 claims abstract description 5
- 238000000926 separation method Methods 0.000 claims description 22
- 238000001704 evaporation Methods 0.000 claims description 6
- 230000008020 evaporation Effects 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 3
- 238000007670 refining Methods 0.000 claims description 3
- 239000010409 thin film Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 5
- 239000003054 catalyst Substances 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 239000012071 phase Substances 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000005764 inhibitory process Effects 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005215 recombination Methods 0.000 description 2
- 230000006798 recombination Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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Abstract
The embodiment of the application provides a method for recovering BDO and inhibiting BDO hydrogenation side reaction of a GBL device, and relates to the field of BDO recovery and inhibiting BDO hydrogenation side reaction. The method for recovering BDO and inhibiting BDO hydrogenation side reaction by using the GBL device comprises the following steps: step one: the crude GBL obtained by dehydrogenation reaction enters a vacuum light component removal tower through a pipeline, and the light components in the crude GBL are removed through the vacuum light component removal tower; the method can recycle valuable chemicals, and can bring considerable economic benefit to enterprises by recycling BDO in heavy components at the bottom of the high-boiling tower, and simultaneously introduce BDO solution containing GBL into the two-stage high-pressure hydrogenation reactor, thereby playing roles in inhibiting the generation of side reaction GBL, dissolving polymer in the two-stage high-pressure hydrogenation reactor and reducing the pressure difference of a bed layer, improving the reaction condition and the operation condition of the two-stage high-pressure hydrogenation reactor, prolonging the service life of the high-pressure hydrogenation catalyst, achieving the maximization of comprehensive utilization of product resources, reducing the production cost and improving the economy of enterprises.
Description
Technical Field
The application relates to the technical field of BDO recovery and BDO hydrogenation side reaction inhibition, in particular to a method for recovering BDO and BDO hydrogenation side reaction inhibition by a GBL device.
Background
R-butyl lactone (GBL for short) is an important fine organic chemical raw material, an intermediate for drug synthesis and an excellent solvent, and has great market demand. The most common process for producing r-butyl lactone in industry at present is a1, 4-butanediol (BDO for short) gas phase dehydrogenation method, and the crude GBL obtained by dehydrogenation reaction is treated by a vacuum light component removal tower, a GBL rectifying tower, a high-boiling tower and the like to obtain GBL products; in the process, GBL solution (heavy component for short) containing nearly 50% -60% BDO at the bottom of the high-boiling tower is usually sent to an incinerator system for incineration, so that the GBL solution is wasted.
However, with the development of GBL industry, the production scale of the device is larger and larger, the recombination component at the bottom of the high-boiling tower is also increased continuously, and the recovery of BDO in the recombination component can bring considerable economic benefit to enterprises; meanwhile, BDO solution containing GBL is introduced into the two-stage high-pressure hydrogenation reactor, so that the conditions and operation conditions of the high-pressure hydrogenation reaction can be improved, the service life of the high-pressure hydrogenation catalyst can be prolonged, and the like. Therefore, from the viewpoint of reducing production cost, comprehensively utilizing products and improving enterprise economy, the recovery and utilization of the products in the heavy components have important significance.
Disclosure of Invention
The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the application provides a method for recovering BDO and inhibiting BDO hydrogenation side reaction by using a GBL device, which comprises the following steps:
step one: the crude GBL obtained by dehydrogenation reaction enters a vacuum light component removal tower through a pipeline, and the light components in the crude GBL are removed through the vacuum light component removal tower;
Step two: the bottom product of the vacuum light removal tower enters a GBL rectifying tower through a pump, is rectified by the GBL rectifying tower, the industrial GBL is obtained at the tower top, the electronic GBL product is obtained at the tower side, and is finally respectively sent into an industrial GBL storage tank and an electronic GBL storage tank through pipelines to be collected, the bottom product of the GBL rectifying tower is sent into a high-boiling tower through the pump, and the GBL product is sent into a GBL finished product tank for storage through the top of the high-boiling tower;
Step three: the solution containing GBL and BDO at the bottom of the high-boiling tower is pumped into a separation system, GBL and BDO solution is separated by the separation system, and the separated GBL product is returned to the GBL rectifying tower for refining and recycling by a pump;
Step four: the solution containing GBL and BDO at the bottom of the high-boiling tower is directly sent into the second-stage high-pressure hydrogenation reactor through a pump according to the components for recycling, thereby inhibiting the generation of side reaction GBL, dissolving polymer in the second-stage high-pressure hydrogenation reactor and reducing bed pressure difference;
Step five: and directly sending BDO solution separated in the separation system into a second-stage high-pressure hydrogenation reactor for recycling, and finally sending the product to a BDO rectification system through the bottom of the BDO reactor.
According to the method for recovering BDO and inhibiting BDO hydrogenation side reaction by using the GBL device, the heavy component at the bottom of the Gao Feida is connected with the inlet of the separation system through a pipeline, and the heavy component product at the bottom of the GBL rectifying tower is connected with the inlet of the high-boiling tower through a pipeline.
According to the method for recovering BDO and inhibiting BDO hydrogenation side reaction by using the GBL device, the gas phase outlet of the separation system is connected with the feeding port of the GBL rectifying tower through a pipeline.
According to the method for recovering BDO and inhibiting BDO hydrogenation side reaction by the GBL device, a BDO solution outlet at the bottom of the separation system is connected with a liquid phase inlet of a two-stage high-pressure hydrogenation reactor of the BDO device through a pipeline.
According to the method for recovering BDO and inhibiting BDO hydrogenation side reaction by using the GBL device, in the process of the second rectification, when the crude GBL is injected into the GBL rectification column, the internal temperature range is 80-100 ℃.
According to the method for recovering BDO and inhibiting BDO hydrogenation side reaction by using the GBL device, in the third step, the separation system is a multi-stage flash evaporation, and is also an evaporation kettle and a thin film evaporator.
According to the method for recovering BDO and inhibiting BDO hydrogenation side reactions by the GBL device, in the first step, the feeding of the crude GBL in the vacuum light component removal tower and the removal of light component discharge through the vacuum light component removal tower can be continuously carried out.
According to the method for recovering BDO and inhibiting BDO hydrogenation side reaction by using the GBL device, in the second step, the industrial-grade GBL product and the electronic-grade GBL product obtained by rectification are required to be firstly taken out of the industrial-grade GBL product at the top of the tower and then the electronic-grade GBL product at the bottom of the tower in the order from top to bottom, so that the mixture of the GBL products is prevented from being influenced by gravity.
The application has the beneficial effects that: the application can recycle valuable chemicals, and can bring considerable economic benefit to enterprises by recycling BDO in heavy components at the bottom of a high-boiling tower, and simultaneously introduce BDO solution containing GBL into a two-stage high-pressure hydrogenation reactor to play roles in inhibiting the generation of side reaction GBL and dissolving polymer in the two-stage high-pressure hydrogenation reactor to reduce the pressure difference of a bed layer, thereby improving the reaction condition and the operation condition of the two-stage high-pressure hydrogenation reactor, prolonging the service life of the high-pressure hydrogenation catalyst, achieving the maximization of comprehensive utilization of product resources, reducing the production cost and improving the economy of enterprises.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for recovering BDO and inhibiting BDO hydrogenation side reactions in a GBL unit according to the invention.
The figure indicates:
1. a vacuum light component removing tower; 2. GBL rectifying tower; 3. a high boiling tower; 4. a separation system; 5. a two-stage high-pressure hydrogenation reactor.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, based on the embodiments of the application, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the application.
A method for recovering BDO and inhibiting BDO hydrogenation side reactions in a GBL device according to an embodiment of the present application will be described below with reference to the accompanying drawings.
As shown in fig. 1, a method for recovering BDO and inhibiting BDO hydrogenation side reaction in a GBL device according to an embodiment of the present application includes the following steps:
Step one: the crude GBL obtained by dehydrogenation enters a vacuum light component removal tower 1 through a pipeline, and the light components in the crude GBL are removed through the vacuum light component removal tower 1; the raw GBL is fed in the vacuum light component removal tower 1 and the light component removal through the vacuum light component removal tower 1 can be continuously carried out;
Step two: the bottom product of the vacuum light removal tower 1 enters a GBL rectifying tower 2 through a pump, is rectified by the GBL rectifying tower 2, an industrial grade GBL is obtained at the tower top, an electronic grade GBL product is obtained at the tower side, and is finally respectively sent into an industrial grade GBL storage tank and an electronic grade GBL storage tank through pipelines to be collected, the bottom product of the GBL rectifying tower 2 is sent into a high-boiling tower 3 through a pump, and the GBL product is sent into a GBL finished product tank for storage through the tower top of the high-boiling tower 3;
Wherein, the heavy component product at the bottom of the GBL rectifying tower 2 is connected with the inlet of the high-boiling tower 3 through a pipeline;
Further, in the rectification process, when the crude GBL is injected into the GBL rectification column 2 through a pipeline, the internal temperature range is 80-100 ℃;
Meanwhile, the industrial grade GBL product and the electronic grade GBL product obtained by the rectification in the second step are required to be firstly taken out according to the sequence of first up and then down, and then the electronic grade GBL product at the bottom of the tower is taken out, so that the mixture of the GBL products is prevented from being influenced by gravity;
Step three: the solution containing GBL and BDO at the bottom of the high-boiling tower 3 is pumped into a separation system 4, GBL and BDO solution is separated by the separation system 4, and the separated GBL product is returned to the GBL rectifying tower 2 by a pump for refining and recycling;
The heavy component at the bottom of the high-boiling tower 3 is connected with the inlet of the separation system 4 through a pipeline, and the gas phase outlet of the separation system 4 is connected with the feed inlet of the GBL rectifying tower 2 through a pipeline;
Specifically, in the third step, the separation system 4 is a multi-stage flash evaporation system, an evaporation kettle is provided with a stirring device and a thin film evaporator, and the actual model is selected according to actual requirements;
Step four: the solution containing GBL and BDO at the bottom of the high-boiling tower 3 is directly sent into the second-stage high-pressure hydrogenation reactor 5 to be recycled through a pump according to the components, thereby inhibiting the generation of side reaction GBL and dissolving the polymer in the second-stage high-pressure hydrogenation reactor 5 to reduce the pressure difference of the bed;
further, a BDO solution outlet at the bottom of the separation system 4 is connected with a liquid phase inlet of the BDO device second-stage high-pressure hydrogenation reactor 5 through a pipeline;
step five: the BDO solution separated in the separation system 4 is directly sent into the second-stage high-pressure hydrogenation reactor 5 for recycling, and finally the product is sent out to the BDO rectification system through the bottom of the BDO solution.
Aiming at the problems that the GBL solution containing 50% -60% BDO at the bottom of the high-boiling tower 3 is usually sent to an incinerator system for incineration and is difficult to recycle, and the conditions and the operation conditions of high-pressure hydrogenation reaction are difficult to improve and the service life of a high-pressure hydrogenation catalyst is prolonged, provided by the method for recycling BDO by using the GBL device and inhibiting BDO hydrogenation side reaction, valuable chemicals in the BDO can be effectively recycled by recycling BDO in heavy components at the bottom of the high-boiling tower 3, so that considerable economic benefits can be brought to enterprises; meanwhile, BDO solution containing GBL is introduced into the two-stage high-pressure hydrogenation reactor 5, so that the effects of inhibiting the generation of side reaction GBL and dissolving the polymer in the two-stage high-pressure hydrogenation reactor 5 to reduce the pressure difference of the bed layer are achieved, the reaction condition and the operation working condition of the two-stage high-pressure hydrogenation reactor 5 are improved, the service life of the high-pressure hydrogenation catalyst is prolonged, the comprehensive utilization of product resources is maximized, the production cost is reduced, and the economical efficiency of enterprises is improved.
The above embodiments of the present application are only examples, and are not intended to limit the scope of the present application, and various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1.A method for recovering BDO and inhibiting BDO hydrogenation side reaction in a GBL device, characterized in that the method for recovering BDO and inhibiting BDO hydrogenation side reaction in a GBL device comprises the following steps:
step one: the crude GBL obtained by dehydrogenation reaction enters a vacuum light component removal tower (1) through a pipeline, and the light components in the crude GBL are removed through the vacuum light component removal tower (1);
Step two: the bottom product of the vacuum light removal tower (1) enters a GBL rectifying tower (2) through a pump, is rectified by the GBL rectifying tower (2), the top of the tower is provided with an industrial-grade GBL, the side of the tower is provided with an electronic-grade GBL product, and finally the industrial-grade GBL product and the electronic-grade GBL product are respectively sent into an industrial-grade GBL storage tank and an electronic-grade GBL storage tank through pipelines to be collected, the bottom product of the GBL rectifying tower (2) is sent into a high-boiling tower (3) through a pump, and the GBL product is sent into a GBL finished product tank for storage through the top of the high-boiling tower (3);
step three: the solution containing GBL and BDO at the bottom of the high-boiling tower (3) is pumped into a separation system (4), GBL and BDO solution is separated by the separation system (4), and the separated GBL product is returned to the GBL rectifying tower (2) for refining and recycling by a pump;
Step four: the solution containing GBL and BDO at the bottom of the high-boiling tower (3) is directly sent into the second-stage high-pressure hydrogenation reactor (5) to be recycled through a pump according to the components, thereby inhibiting the generation of side reaction GBL, dissolving the polymer in the second-stage high-pressure hydrogenation reactor (5) and reducing the pressure difference of a bed layer;
Step five: and (3) directly sending BDO solution separated in the separation system (4) into a two-stage high-pressure hydrogenation reactor (5) for recycling, and finally sending the product to a BDO rectification system through the bottom of the BDO reactor.
2. The method for recovering BDO and inhibiting BDO hydrogenation side reaction of GBL device according to claim 1, wherein the heavy component product at the bottom of Gao Feida (3) is connected with the inlet of the separation system (4) through a pipeline, and the heavy component product at the bottom of the GBL rectifying tower (2) is connected with the inlet of the high-boiling tower (3) through a pipeline.
3. The method for recovering BDO and inhibiting BDO hydrogenation side reactions according to claim 1, wherein the gas phase outlet of the separation system (4) is connected with the feed inlet of the GBL rectifying tower (2) through a pipeline.
4. The method for recovering BDO and inhibiting BDO hydrogenation side reactions according to claim 1, wherein the BDO solution outlet at the bottom of the separation system (4) is connected with the liquid inlet of the two-stage high-pressure hydrogenation reactor (5) of the BDO device through a pipeline.
5. A method for recovering BDO and inhibiting BDO hydrogenation side reaction in GBL device according to claim 1, wherein during said step two rectification, the internal temperature range is 80-100 ℃ when the crude GBL is injected into GBL rectifying column (2).
6. A method for recovering BDO and inhibiting BDO hydrogenation side reaction in GBL device according to claim 1, wherein in said third step, said separation system (4) is a multi-stage flash evaporation, and further is an evaporation kettle (with stirring) and a thin film evaporator.
7. A GBL device recovery BDO and method of inhibiting BDO hydrogenation side reactions according to claim 1, wherein in step one, the crude GBL feeding in the vacuum light ends column (1) and the removal of light ends by the vacuum light ends column (1) is performed continuously.
8. The method for recovering BDO and inhibiting BDO hydrogenation side reaction of GBL device according to claim 1, wherein in said step two, the industrial grade GBL and electronic grade GBL products obtained by rectification are first taken out of the top industrial grade GBL products in order of top to bottom, and then the bottom electronic grade GBL products are taken out, so as to prevent gravity from affecting GBL product mixing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410373497.5A CN118267735A (en) | 2024-03-29 | 2024-03-29 | Method for recovering BDO and inhibiting BDO hydrogenation side reaction by GBL device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410373497.5A CN118267735A (en) | 2024-03-29 | 2024-03-29 | Method for recovering BDO and inhibiting BDO hydrogenation side reaction by GBL device |
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| CN118267735A true CN118267735A (en) | 2024-07-02 |
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| CN202410373497.5A Pending CN118267735A (en) | 2024-03-29 | 2024-03-29 | Method for recovering BDO and inhibiting BDO hydrogenation side reaction by GBL device |
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