CN110804112A - Reactant recycling system and chemical reaction system - Google Patents
Reactant recycling system and chemical reaction system Download PDFInfo
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- CN110804112A CN110804112A CN201911253676.0A CN201911253676A CN110804112A CN 110804112 A CN110804112 A CN 110804112A CN 201911253676 A CN201911253676 A CN 201911253676A CN 110804112 A CN110804112 A CN 110804112A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F110/00—Homopolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F110/02—Ethene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/06—Flash distillation
Abstract
The invention provides a reactant recycling system and a chemical reaction system, wherein the reactant recycling system is provided with a flash tank, a reactant separation device and a reactant recycling device, the reactant separation device is used for separating/separating reactants of a gas-liquid two-phase mixed reaction product and a liquid-phase reaction product respectively, almost all unreacted reactants can be separated, and the separated reactants can be recycled for reaction. Greatly improves the utilization rate of reactants, reduces the production cost, improves the economic benefit and improves the quality of reaction products. Circulation pipelines are respectively arranged between the reactant separation device and the flash tank and between the reactant recovery device and the reactant recovery device, so that the reactants can be subjected to multiple circulation separation, the purity of the separated reactants is further improved, and the recovery utilization rate of the reactants and the quality of reaction products are improved. The chemical reaction system including the chemical reaction system also has the above-described advantageous effects.
Description
Technical Field
The invention relates to the technical field of chemical engineering, in particular to a technology for recycling unreacted reactants in chemical reaction in the field of chemical engineering, and more particularly relates to a reactant recycling system and a chemical reaction system.
Background
It is well known that chemical industry generally involves different chemical reactions, and the general chemical reactions involve mutual reaction between different reactants, for example, in the production process of α -olefin by polymerization of ethylene, mainly polymerization of ethylene, and due to the influence of many factors such as reaction temperature, reaction time, reactant supply amount, etc. in the reaction process, unreacted reactants are often mixed in the reaction product, for example, α -olefin is mixed with ethylene which does not participate in polymerization.
These unreacted reactants are mixed in the reaction product, which may affect the quality of the reaction product, and may cause serious waste of the reactants, thereby increasing the production cost.
Based on the above drawbacks or deficiencies, there is an urgent need for a device or system capable of recovering the unreacted reactants in the reaction product.
Disclosure of Invention
In order to solve the problems of incomplete reaction of reactants in the prior art on reaction products and the whole production process, the invention aims to provide a reactant recycling system and a chemical reaction system.
According to a first aspect of the present invention, there is provided a reactant recovery and recycling system comprising a flash tank, a reactant separation device in communication with the flash tank, and a reactant recovery device in communication with the reactant separation device, wherein,
a reaction product inlet is formed in one side of the flash tank, the flash tank receives a reaction product containing unreacted reactants through the reaction product inlet, the reaction product is subjected to flash evaporation, and the reaction product subjected to flash evaporation enters the reactant separation device;
the reactant separation device separates the unreacted reactant from the reaction product, and the separated reactant enters the reactant recovery device.
Optionally, the reactant separation device comprises:
a liquid separating tank communicated with the top outlet of the flash tank,
and a reactant disengaging column in communication with a bottom outlet of the flash tank;
the top end of the liquid separation tank is provided with a gas phase inlet, the bottom end of the liquid separation tank is provided with a liquid outlet, the upper part of the liquid separation tank is provided with a gas outlet, the gas phase inlet is communicated with the top outlet of the flash tank and receives a gas phase reaction product from the flash tank, the gas outlet is communicated with the reactant recovery device, the upper part of the flash tank is also provided with a return port, and the liquid outlet is communicated with the return port to form a first return pipeline of the separated liquid phase reaction product;
the reactant separation tower comprises a liquid-phase reaction product inlet, a reactant outlet arranged at the top of the reactant separation tower and a reaction product outlet arranged at the bottom of the reactant separation tower, the liquid-phase reaction product inlet is communicated with the bottom outlet of the flash tank to form a liquid-phase reactant pipeline, the reactant outlet is communicated with the reactant recovery device, and the separated liquid-phase reaction product is discharged through the reaction product outlet.
Optionally, a first cooler is further disposed at the gas-phase inlet at the top end of the liquid separation tank, and the first cooler cools the reaction product entering the liquid separation tank to form a gas-liquid two-phase mixture.
Optionally, the first return line is further provided with a branch return line, and the branch return line is communicated with the liquid-phase reactant pipeline.
Optionally, the reactant recovery device comprises a reflux tank and a compressor system,
the reflux tank is provided with a first liquid inlet and an air outlet, the first liquid inlet is communicated with a reactant outlet at the top of the reactant separation tower, and the reflux tank is used for storing the reactant from the reactant separation tower;
the compressor system is respectively communicated with the reflux tank and the liquid separating tank through the gas outlet and the gas outlet of the liquid separating tank, and is used for conveying reactants discharged from the gas outlet of the liquid separating tank and/or reactants in the reflux tank into a reaction device through a circulating pipeline for recycling.
Optionally, a second cooler is further disposed between the reactant separation tower and the reflux tank, and the second cooler cools the reactant entering the reflux tank from the reactant separation tower.
Optionally, the reflux tank is further provided with a liquid return port, the upper part of the reactant separation tower is further provided with a second liquid inlet, the liquid return port is communicated with the second liquid inlet to form a second reflux pipeline, and the reactant in the reflux tank flows back to the reactant separation tower again through the second reflux pipeline and contacts with the gas phase in the tower to realize gas-liquid separation.
Optionally, the reflux drum is further provided with a discharge line for discharging the overhead product stored in the reflux drum to the next process.
Alternatively, the reactants comprise ethylene and the reaction product comprises α olefins formed from the polymerization of ethylene.
According to a second aspect of the present invention, the present invention provides a chemical reaction system for preparing α -olefin from ethylene polymerization, the chemical reaction system comprising an ethylene polymerization reaction system and an ethylene recycling system, wherein the ethylene recycling system comprises the reactant recycling system provided by the present invention, a flash tank and a recovery device of the reactant recycling system are respectively communicated with the ethylene polymerization reaction system, the flash tank receives a reaction product from the ethylene polymerization reaction system, the reaction product contains ethylene for polymerization, and the recovery device provides ethylene separated by the reactant recycling device to the reaction system.
The reactant recycling system and the chemical reaction system have the following technical effects:
the reactant recycling system is provided with a flash tank, a reactant separation device and a reactant recycling device, wherein the reactant separation device is used for separating/separating reactants from a gas-liquid two-phase mixed reaction product and a liquid-phase reaction product respectively, so that almost all unreacted reactants can be separated, and the separated reactants can be recycled for reaction. Therefore, the utilization rate of reactants can be greatly improved, the production cost is reduced, the economic benefit is improved, and the quality of reaction products is improved.
In addition, circulation pipelines are respectively arranged between the reactant separation device and the flash tank and between the reactant recovery device and the reactant recovery device, so that the reactants can be subjected to multiple circulation separation, the purity of the separated reactants and the purity of reaction products are further improved, and the recovery utilization rate of the reactants and the quality of the reaction products are further improved.
The chemical reaction system including the chemical reaction system also has the above-described advantageous effects.
Drawings
Fig. 1 shows a schematic structural diagram of a reactant recycling system according to an embodiment of the present invention.
Fig. 2 shows a schematic diagram of a chemical reaction system provided in the second embodiment of the present invention.
List of reference numerals
100 flash tank
101 inlet for reaction product
102 flash tank
103 flash tank bottom outlet
104 heat tracing medium inlet
105 heat tracing medium outlet
106 return port
200 reactant separation device
201 liquid separating tank
202 gas phase inlet
203 gas outlet
204 liquid outlet
205 first return line
206 reactant stripping column
207 liquid phase reaction product inlet
208 outlet for reaction products
209 reactant outlet
210 first cooler
211 branch return line on the first return line
212 second cooler
213 second inlet
214 liquid phase reactant pipeline
300 reactant recovery device
301 reflux tank
3011 first liquid inlet
3012 air outlet
3013 liquid return port
302 compressor
303 reactant return line
304 circulation pipeline
305 discharge line
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention.
In the following embodiments of the present invention, words indicating orientations, such as "upper", "lower", "left", "right", "horizontal", "vertical", etc., are referred to only to enable those skilled in the art to better understand the present invention, and should not be construed as limiting the present invention.
Example one
As shown in FIG. 1, the recycling system comprises a flash tank 100, a reactant separation device 200 connected to the flash tank 100, and a reactant recycling device 300. in this embodiment, the recycling of ethylene, which is a reactant for producing α -olefin by polymerizing ethylene, is described as an example.
One side (for example, the left side shown in fig. 1) of the flash tank 100 is provided with a reaction product inlet 101, the flash tank 100 receives a reaction product including unreacted reactants through the reaction product inlet 101, and flashes the reaction product, and the flashed reaction product enters the reactant separation device 200. in this embodiment, the flash tank 100 may be a flash tank commonly used in the art, as shown in fig. 1, a high-pressure and high-temperature reaction product α -olefin enters the flash tank 101 through the reaction product inlet 101, is subjected to pressure reduction under the action of a pressure reducing valve of the flash tank, and then is subjected to boiling vaporization in the flash tank, so that α -olefin is rapidly subjected to boiling vaporization in the flash tank, and is subjected to two-phase separation, and unreacted ethylene is mostly present in a gas phase and a small part is present in a liquid phase.
The reactant separation device 200 separates unreacted reactants from the reaction products, and the separated reactants enter the reactant recovery device 300.
Referring also to fig. 1, the reactant separation device 200 comprises a liquid separation tank 201 and a reactant separation tower 206, wherein a gas phase inlet 202 is arranged at the top end of the liquid separation tank 201, a liquid outlet 204 is arranged at the bottom end of the liquid separation tank, the gas phase inlet 202 is communicated with the top outlet 102 of the flash tank 100, so that the liquid separation tank 201 is communicated with the flash tank 100, a gas phase reaction product flashed by the flash tank escapes from the top outlet 102 of the flash tank 100 and enters the liquid separation tank 201 through the gas phase inlet 202 at the top of the liquid separation tank 201, for better liquid separation, a first cooler 210 is arranged above the gas phase inlet of the liquid separation tank, the gas phase reactant is firstly cooled by the first cooler 210 to form a gas-liquid two-phase mixture, and as most of the gas phase reactant is unreacted reactant ethylene, part of heavy component α -olefin is doped in the gas phase reactant, and the condensation of the heavy.
And the gas-liquid two-phase mixture enters a liquid separation tank for liquid separation, high-purity gas-phase ethylene is separated, and the gas-phase ethylene is discharged to a reactant recovery device through a gas outlet 203 arranged on one side of the liquid separation tank to be recovered and recycled.
The upper part of the flash tank 100 is also provided with a return port 106, a liquid outlet 204 is communicated with the return port 106 to form a first return pipeline 205 for separated liquid phase reaction products, heavy components α -olefin of the liquid phase separated by the liquid separation tank flows back to the flash tank 100 through the liquid outlet 204 at the bottom end of the liquid separation tank through the first return pipeline 205 for re-flash and liquid separation.
The reactant separation tower 206 is provided with a liquid-phase reaction product inlet 207, the liquid-phase reaction product inlet 207 is communicated with the bottom outlet 103 of the flash tank 100 to form a liquid-phase reactant pipeline 214, the liquid-phase reaction product discharged from the bottom outlet 103 of the flash tank 100 enters the reactant separation tower 206 through the liquid-phase reactant inlet 207, the reactant separation tower 206 separates a small amount of reactants contained in the liquid-phase reaction product to obtain a gas-phase reactant, and the gas-phase reactant escapes to the reactant recovery device 300 through a reactant outlet 209 at the top of the reactant separation tower 206. The separated liquid phase reaction product is discharged through a reaction product outlet 208 at the bottom of the reactant disengaging column 206, for example by discharge to a reaction product storage device. In order to facilitate the storage of the reactant discharged from the reactant outlet 209 at the top of the reactant disengaging tower 206, in this embodiment, a second cooler 212 is further disposed between the reactant outlet 209 and the reactant recovering device to cool the gas-phase reactant to the liquid-phase reactant for the storage.
As shown in fig. 1, in a preferred embodiment of this embodiment, the first return line 205 is further provided with a branch return line 211, the branch return line 211 is communicated with the liquid-phase reactant line 214, and a part of the heavy component α -olefin refluxed in the first return line can be refluxed to the liquid-phase reactant line 214 through the branch return line 211, and then enter the reactant separation tower 206, so as to perform the reactant re-separation in the reactant separation tower 206.
Still referring to fig. 1, the reactant recovery apparatus 300 comprises a reflux drum 301 and a compressor system 302, wherein the reflux drum 301 is provided with a first liquid inlet 3011 and a gas outlet 3012, the first liquid inlet 3011 is communicated with the reactant outlet 209 at the top of the reactant stripping tower, and the reflux drum 301 is used for receiving and storing the reactant from the reactant stripping tower. And the second cooling device is arranged between the first liquid inlet 3011 of the reflux tank 301 and the reactant outlet 209 at the top of the reactant stripping tower. The compressor system 302 is communicated with the reflux tank 301 through a liquid outlet 3012, is communicated with the liquid separation tank 201 through the gas outlet 203 of the liquid separation tank 201, and is used for sending the reactant discharged from the gas outlet 203 of the liquid separation tank 201 and/or the reactant stored in the reflux tank 301 into the reaction device for recycling through the circulating pipeline 304.
The reflux tank 301 is further provided with a liquid return port 3013, the upper part of the reactant separation tower 206 is further provided with a second liquid inlet 213, the liquid return port 3013 is communicated with the second liquid inlet 213 to form a second reflux pipeline 303, and the reactant in the reflux tank 301 can flow back to the reactant separation tower 206 again through the second reflux pipeline 303 to be separated from the reactant, so that the purity of the separated reactant is increased. The reflux drum 301 is further provided with a discharge line 305, the discharge line 305 being used for discharging the overhead product stored in the reflux drum 301 to the next process.
As is well known in the art, in order to adjust the parameters such as the flow rate, the pressure, etc. of the gas and/or the liquid in the various pipelines of the reactant recycling system, flow valves, pressure valves, etc. may be provided in the pipelines as required.
Example two
This example provides a chemical reaction system for preparing α -olefin by polymerizing ethylene, which comprises an ethylene polymerization reaction system and an ethylene recycling system, as shown in fig. 2.
The ethylene recycling system may be the reactant recycling system according to the first embodiment of the present invention, a flash tank and a recycling device of the reactant recycling system are respectively communicated with the ethylene polymerization reaction system, the flash tank receives a reaction product from the ethylene polymerization reaction system, the reaction product includes polymerized ethylene, and the recycling device provides the ethylene separated by the reactant recycling device to the reaction system.
The working principle of the reactant recycling system is the same as that described in the first embodiment, and is not described herein again.
In summary, the reactant recycling system and the chemical reaction system of the present invention have the following technical effects:
the reactant recycling system is provided with a flash tank, a reactant separation device and a reactant recycling device, wherein the reactant separation device is used for separating/separating reactants from a gas-liquid two-phase mixed reaction product and a liquid-phase reaction product respectively, so that almost all unreacted reactants can be separated, and the separated reactants can be recycled for reaction. Therefore, the utilization rate of reactants can be greatly improved, the production cost is reduced, the economic benefit is improved, and the quality of reaction products is improved.
In addition, circulation pipelines are respectively arranged between the reactant separation device and the flash tank and between the reactant recovery device and the reactant recovery device, so that the reactants can be subjected to multiple circulation separation, the purity of the separated reactants and the purity of reaction products are further improved, and the recovery utilization rate of the reactants and the quality of the reaction products are further improved.
The chemical reaction system including the chemical reaction system also has the above-described advantageous effects.
The foregoing embodiments are merely illustrative of the principles of the present invention and its efficacy, and are not to be construed as limiting the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A reactant recycling system, comprising: a flash tank, a reactant separation device in communication with the flash tank, and a reactant recovery device in communication with the reactant separation device, wherein,
a reaction product inlet is formed in one side of the flash tank, the flash tank receives a reaction product containing unreacted reactants through the reaction product inlet, the reaction product is subjected to flash evaporation, and the reaction product subjected to flash evaporation enters the reactant separation device;
the reactant separation device separates the unreacted reactant from the reaction product, and the separated reactant enters the reactant recovery device.
2. The reactant recovery and recycle system of claim 1, wherein the reactant separation device comprises:
a liquid separating tank communicated with the top outlet of the flash tank,
and a reactant disengaging column in communication with a bottom outlet of the flash tank;
the top end of the liquid separation tank is provided with a gas phase inlet, the bottom end of the liquid separation tank is provided with a liquid outlet, the upper part of the liquid separation tank is provided with a gas outlet, the gas phase inlet is communicated with the top outlet of the flash tank and receives a gas phase reaction product from the flash tank, the gas outlet is communicated with the reactant recovery device, the upper part of the flash tank is also provided with a return port, and the liquid outlet is communicated with the return port to form a first return pipeline of the separated liquid phase reaction product;
the reactant separation tower comprises a liquid-phase reaction product inlet, a reactant outlet arranged at the top of the reactant separation tower and a reaction product outlet arranged at the bottom of the reactant separation tower, the liquid-phase reaction product inlet is communicated with the bottom outlet of the flash tank to form a liquid-phase reactant pipeline, the reactant outlet is communicated with the reactant recovery device, and the separated liquid-phase reaction product is discharged through the reaction product outlet.
3. The reactant recycling system of claim 2, wherein a first cooler is further disposed at the gas phase inlet at the top end of the liquid separation tank, and the first cooler cools the reaction product entering the liquid separation tank to form a gas-liquid two-phase mixture.
4. The reactant recovery and recycle system of claim 2, wherein the first return line is further provided with a branch return line, the branch return line being in communication with the liquid phase reactant line.
5. The reactant recovery and recycle system of claim 2, wherein the reactant recovery device comprises a reflux drum and a compressor system,
the reflux tank is provided with a first liquid inlet and an air outlet, the first liquid inlet is communicated with a reactant outlet at the top of the reactant separation tower, and the reflux tank is used for storing the reactant from the reactant separation tower;
the compressor system is respectively communicated with the reflux tank and the liquid separating tank through the gas outlet and the gas outlet of the liquid separating tank, and is used for conveying reactants discharged from the gas outlet of the liquid separating tank and/or reactants in the reflux tank into a reaction device through a circulating pipeline for recycling.
6. The reactant recycling system of claim 5, further comprising a second cooler disposed between the reactant stripping tower and the reflux drum, wherein the second cooler cools the reactant entering the reflux drum from the reactant stripping tower.
7. The reactant recycling system of claim 5, wherein the reflux tank is further provided with a liquid return port, the upper portion of the reactant separation tower is further provided with a second liquid inlet, the liquid return port is communicated with the second liquid inlet to form a second reflux pipeline, and the reactant in the reflux tank flows back to the reactant separation tower again through the second reflux pipeline and contacts with the gas phase in the tower to realize gas-liquid separation.
8. The reactant recovery and recycling system of claim 7, wherein the reflux drum is further provided with a discharge line for discharging the overhead product stored in the reflux drum to a next process.
9. The reactant recovery and recycle system of claim 7, wherein the reactant comprises ethylene and the reaction product comprises α olefins formed from the polymerization of ethylene.
10. A chemical reaction system for preparing α -olefin from ethylene polymerization, the chemical reaction system comprises an ethylene polymerization reaction system and an ethylene recycling system, and is characterized in that,
the ethylene recycling system comprises the reactant recycling system as claimed in any one of claims 1 to 9, wherein a flash tank and a recycling device of the reactant recycling system are respectively communicated with the ethylene polymerization system, the flash tank receives a reaction product from the ethylene polymerization system, the reaction product comprises polymerized ethylene, and the recycling device provides the ethylene separated by the reactant recycling device to the reaction system.
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| CN201911253676.0A CN110804112A (en) | 2019-12-09 | 2019-12-09 | Reactant recycling system and chemical reaction system |
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| CN201911253676.0A CN110804112A (en) | 2019-12-09 | 2019-12-09 | Reactant recycling system and chemical reaction system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111875719A (en) * | 2020-06-17 | 2020-11-03 | 南京延长反应技术研究院有限公司 | Micro-interface reinforced reaction system and method for preparing rubber |
| CN112516949A (en) * | 2020-11-16 | 2021-03-19 | 南阳师范学院 | Reaction equipment with product separation function |
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