Condensate utilization system for styrene production

Abstract

The utility model relates to a condensate utilization system for styrene production, which comprises a first reactor, a second reactor, an oil-water separation tank, a filter device, a heat exchanger and a steam generator, the first reactor is connected with the second reactor, the second reactor is communicated with the oil-water separation tank, the oil-water separation tank is connected with the filter device, and the steam generator is connected with the heat exchanger. The heat exchanger is connected with the filtering device, the steam generator is connected with the heat exchanger and the second reactor, process water generated in the styrene production process is sequentially subjected to filtering purification and heat exchange heating, and one end of a condensate outlet pipe is communicated with a third water conveying pipe. Condensate generated in the heat exchange process of the heat exchanger and process water are conveyed into the steam generator through the third water conveying pipe together to be used for generating high-temperature steam, and therefore the condensate generated in the heat exchange process can be recycled, waste can be reduced, and cost can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of styrene production, in particular to a condensate utilization system for styrene production. Background Art

[0002] Styrene is an organic compound, which is mainly used as an important monomer for synthetic resins, ion exchange resins and synthetic rubber, and can also be used in pharmaceutical, dye, pesticide and mineral processing industries. The method for industrial production of styrene is to use benzene and ethylene as raw materials, firstly carry out alkylation reaction under certain conditions to generate ethylbenzene, then mix ethylbenzene with steam in a certain proportion and carry out dehydrogenation under certain conditions, and the product after ethylbenzene dehydrogenation is cooled and separated from oil and water to extract styrene. In the process of ethylbenzene dehydrogenation reaction, a lot of process water will be generated, and heat exchange is often required in the process of recycling these process waters. Condensate will be generated in the heat exchange process, but the condensate is not recycled, which will cause waste of condensate and increase production cost. Therefore, there are still shortcomings and deficiencies in the prior art. Utility Model Content

[0003] The utility model aims to provide a condensate utilization system for styrene production to solve the above problems.

[0004] In order to solve the above problems, the technical solution adopted by the utility model is:

[0005] Provided is a condensate utilization system for styrene production, comprising a first reactor, a second reactor, an oil-water separation tank, a filtering device, a heat exchanger and a steam generator, wherein the first reactor is connected to the second reactor, the second reactor is connected to the oil-water separation tank, the oil-water separation tank is connected to the filtering device, the heat exchanger is connected to the filtering device, the steam generator is connected to both the heat exchanger and the second reactor, a second water pipe is arranged between the filtering device and the heat exchanger, a third water pipe is arranged between the heat exchanger and the steam generator, a steam inlet pipe and a condensate outlet pipe are arranged on the heat exchanger, one end of the condensate outlet pipe is connected to the heat exchanger, and the other end of the condensate outlet pipe is connected to the third water pipe.

[0006] Furthermore, a first delivery pipe is provided between the first reactor and the second reactor, and the first reactor and the second reactor are connected through the first delivery pipe.

[0007] Furthermore, a second delivery pipe is provided between the second reactor and the oil-water separation tank, and the second reactor and the oil-water separation tank are connected through the second delivery pipe.

[0008] Furthermore, a first water pipe is provided between the oil-water separation tank and the filtering device, and the oil-water separation tank and the filtering device are connected through the first water pipe.

[0009] Furthermore, a third delivery pipe is provided between the steam generator and the second reactor.

[0010] Furthermore, one end of the second water pipe is communicated with the interior of the filtering device, and the other end of the second water pipe is communicated with the water inlet of the heat exchanger.

[0011] Furthermore, one end of the third water pipe is connected to the water outlet of the heat exchanger, and the other end of the third water pipe is connected to the steam generator.

[0012] Furthermore, the steam inlet pipe is arranged at the top of the heat exchanger.

[0013] Furthermore, one end of the condensate outlet pipe connected to the heat exchanger is located at the bottom of the heat exchanger.

[0014] By adopting the above technical solution, the beneficial effects of the utility model are:

[0015] The condensate utilization system for styrene production provided by the utility model comprises a first reactor, a second reactor, an oil-water separation tank, a filtering device, a heat exchanger and a steam generator. The process water generated in the styrene production process is filtered and purified and heated by heat exchange in sequence. One end of the condensate outlet pipe is connected to the third water pipe. The condensate generated in the heat exchange process of the heat exchanger and the process water are transported together through the third water pipe into the steam generator for generating high-temperature steam, so that the condensate generated by the heat exchange can be recycled, which can reduce waste and reduce costs. Compared with directly passing the generated process water through the steam generator to generate steam, preheating the process water through the heat exchanger and then passing the heated process water through the steam generator to generate steam can save the consumed heat, and the condensate generated in the heat exchange process can also enter the steam generator together with the process water to generate steam, and the utilization rate is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the condensate utilization system for styrene production in the utility model.

[0017] Figure numerals: 10, first reactor; 11, first feed pipe; 12, first delivery pipe; 13, second feed pipe; 20, second reactor; 21, second delivery pipe; 30, oil-water separation tank; 31, first water delivery pipe; 40, filtering device; 50, heat exchanger; 51, second water delivery pipe; 52, third water delivery pipe; 53, steam inlet pipe; 54, condensate outlet pipe; 60, steam generator; 61, third delivery pipe; 70, storage tank; 71, third delivery pipe. DETAILED DESCRIPTION

[0018] In order to make the technical problems, technical solutions and beneficial effects to be solved by the utility model clearer, the utility model is now described in detail in conjunction with the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basics of the utility model in a schematic manner, so it only shows the structure related to the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0019] like Figure 1 As shown, the utility model provides a condensate utilization system for styrene production, which is used to recycle the condensate generated in the production and processing of styrene, thereby saving water resources, reducing waste and lowering production costs.

[0020] like Figure 1 As shown, the condensate utilization system for styrene production provided by the utility model comprises a first reactor 10, a second reactor 20, an oil-water separation tank 30, a filtering device 40, a heat exchanger 50 and a steam generator 60. The first reactor 10 is connected to the second reactor 20, the second reactor 20 is connected to the oil-water separation tank 30, the oil-water separation tank 30 is connected to the filtering device 40, the heat exchanger 50 is connected to the filtering device 40, and the steam generator 60 is connected to both the heat exchanger 50 and the second reactor 20.

[0021] The industrial production method of styrene is to use benzene and ethylene as raw materials, firstly carry out alkylation reaction under certain conditions to produce ethylbenzene, then mix ethylbenzene with steam in a certain proportion and carry out dehydrogenation under certain conditions, and the product after ethylbenzene dehydrogenation is cooled and separated from oil to extract styrene. Process water is produced during the ethylbenzene dehydrogenation reaction, and the process water contains a small amount of polymers and other impurities. If it is directly discharged, it will cause environmental pollution. In addition, high-temperature steam is required during the ethylbenzene dehydrogenation reaction to ensure the smooth progress of the dehydrogenation reaction.

[0022] like Figure 1 As shown, the first reactor 10 is used for the reaction of benzene and ethylene. Benzene and ethylene react in the first reactor 10 to generate ethylbenzene. A first feed pipe 11 and a second feed pipe 13 are provided on the side of the first reactor 10. Benzene material and ethylene material for the reaction are respectively added into the first reactor 10 through the first feed pipe 11 and the second feed pipe 13. A first conveying pipe 12 is provided between the first reactor 10 and the second reactor 20. The ethylbenzene generated in the first reactor 10 is conveyed to the second reactor 20 through the first conveying pipe 12.

[0023] like Figure 1 As shown, the second reactor 20 is used for dehydrogenation reaction of ethylbenzene with steam. The ethylbenzene in the second reactor 20 undergoes dehydrogenation reaction under the action of a catalyst and the introduction of high-temperature steam. The dehydrogenation reaction of ethylbenzene produces a mixture containing a large amount of organic matter such as styrene and ethylbenzene as well as water and other impurities.

[0024] like Figure 1 As shown, a second delivery pipe 21 is provided between the second reactor 20 and the oil-water separation tank 30. The second delivery pipe 21 is used to deliver the above-mentioned mixture produced by the dehydrogenation reaction in the second reactor 20 to the oil-water separation tank 30. The mixture delivered to the oil-water separation tank 30 separates water under the action of the oil-water separation tank 30. The separated water is process water containing a small amount of polymer and other impurities.

[0025] like Figure 1 As shown, a first water pipe 31 is arranged between the oil-water separation tank 30 and the filter device 40. The process water separated by the oil-water separation tank 30 can be transported to the filter device 40 through the first water pipe 31. The process water is filtered and purified by the filter device 40. Specifically, harmful gases, particles, etc. in the process water are physically adsorbed by activated carbon, thereby purifying the process water.

[0026] like Figure 1 As shown, a second water pipe 51 is provided between the filter device 40 and the heat exchanger 50, one end of the second water pipe 51 is communicated with the interior of the filter device 40, and the other end of the second water pipe 51 is communicated with the water inlet of the heat exchanger 50. A third water pipe 52 is provided between the heat exchanger 50 and the steam generator 60, one end of the third water pipe 52 is communicated with the water outlet of the heat exchanger 50, and the other end of the third water pipe 52 is communicated with the steam generator 60. The process water after filtration and purification in the filter device 40 is transported into the heat exchanger 50 through the second water pipe 51 for heat exchange, and the process water after heat exchange and temperature rise enters the steam generator 60 from the heat exchanger 50 through the third water pipe 52, and the steam generator 60 is used to convert the process water after heat exchange into high-temperature steam.

[0027] like Figure 1As shown, the heat exchanger 50 is provided with a steam inlet pipe 53 for introducing hot steam into the heat exchanger 50, and the hot steam is used to heat exchange and heat up the process water entering the heat exchanger 50. The heat exchanger 50 is also provided with a condensate outlet pipe 54, and condensate is formed after the hot steam is heat exchanged. The condensate outlet pipe 54 is used for the condensate to flow out. One end of the condensate outlet pipe 54 is connected to the heat exchanger 50, and the other end of the condensate outlet pipe 54 is connected to the third water pipe 52. Through such a configuration, the generated condensate can be transported together with the process water through the third water pipe 52 into the steam generator 60 for generating high-temperature steam, so that the condensate generated by the heat exchange of the heat exchanger 50 can be recycled, reducing waste and reducing costs.

[0028] like Figure 1 As shown, a third delivery pipe 61 is provided between the steam generator 60 and the second reactor 20. The condensate generated by heat exchange is transported together with the process water through the third water delivery pipe 52 into the steam generator 60 to generate high-temperature steam. The high-temperature steam generated by the steam generator 60 is transported to the second reactor 20 through the third delivery pipe 61. The ethylbenzene in the second reactor 20 undergoes a dehydrogenation reaction under the action of the high-temperature steam.

[0029] The condensate utilization system for styrene production also includes a storage tank 70. The oil-water separation tank 30 is connected to the storage tank 70 via a third delivery pipe 71. The product of ethylbenzene dehydrogenation is separated into oil and water in the oil-water separation tank 30 to obtain styrene, and the styrene is transported into the storage tank 70 via the third delivery pipe 71 for storage.

[0030] The condensate utilization system for styrene production provided by the utility model comprises a first reactor 10, a second reactor 20, an oil-water separation tank 30, a filtering device 40, a heat exchanger 50 and a steam generator 60. The process water generated in the process of styrene production is filtered and purified and heated by heat exchange in sequence. One end of the condensate outlet pipe 54 is connected to the third water pipe 52. The condensate generated in the heat exchange process of the heat exchanger 50 and the process water are transported together through the third water pipe 52 into the steam generator 60 for generating high-temperature steam, so that the condensate generated by the heat exchange can be recycled, which can reduce waste and reduce costs. Compared with directly passing the generated process water through the steam generator to generate steam, preheating the process water through the heat exchanger and then passing the heated process water through the steam generator to generate steam can save the consumed heat, and the condensate generated in the heat exchange process can also enter the steam generator together with the process water to generate steam, and the utilization rate is high.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] It should be understood that the terms "length", "width", "up", "down", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] The above is based on the ideal embodiment of the utility model. Through the above description, relevant staff can make various changes and modifications without departing from the scope of the utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A condensate utilization system for styrene production, characterized in that: The invention comprises a first reactor, a second reactor, an oil-water separation tank, a filtering device, a heat exchanger and a steam generator, wherein the first reactor is connected to the second reactor, the second reactor is connected to the oil-water separation tank, the oil-water separation tank is connected to the filtering device, the heat exchanger is connected to the filtering device, the steam generator is connected to the heat exchanger and the second reactor, a second water pipe is arranged between the filtering device and the heat exchanger, a third water pipe is arranged between the heat exchanger and the steam generator, a steam inlet pipe and a condensate outlet pipe are arranged on the heat exchanger, one end of the condensate outlet pipe is connected to the heat exchanger, and the other end of the condensate outlet pipe is connected to the third water pipe.

2. A condensate utilization system for styrene production according to claim 1, characterized in that: A first conveying pipe is disposed between the first reactor and the second reactor, and the first reactor and the second reactor are connected through the first conveying pipe.

3. A condensate utilization system for styrene production according to claim 1, characterized in that: A second delivery pipe is provided between the second reactor and the oil-water separation tank, and the second reactor and the oil-water separation tank are communicated with each other through the second delivery pipe.

4. A condensate utilization system for styrene production according to claim 1, characterized in that: A first water pipe is arranged between the oil-water separation tank and the filtering device, and the oil-water separation tank is connected to the filtering device through the first water pipe.

5. The condensate utilization system for styrene production according to claim 1, characterized in that: A third conveying pipe is arranged between the steam generator and the second reactor.

6. A condensate utilization system for styrene production according to claim 1, characterized in that: One end of the second water pipe is communicated with the interior of the filter device, and the other end of the second water pipe is communicated with the water inlet of the heat exchanger.

7. A condensate utilization system for styrene production according to claim 1, characterized in that: One end of the third water pipe is communicated with the water outlet of the heat exchanger, and the other end of the third water pipe is communicated with the steam generator.

8. A condensate utilization system for styrene production according to claim 1, characterized in that: The steam inlet pipe is arranged on the top of the heat exchanger.

9. A condensate utilization system for styrene production according to claim 1, characterized in that: One end of the condensate outlet pipe connected to the heat exchanger is located at the bottom of the heat exchanger.

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