Reprocessing device for unqualified MTBE (methyl tert-butyl ether) products
By designing a refining device for unqualified MTBE products, the unqualified MTBE products are converted into qualified MTBE products after refining, which solves the problem of resource waste caused by direct transport of unqualified MTBE products to the storage and transportation tank area in the existing technology, and achieves the increase of economic benefits and the recycling of resources.
Patent Information
- Application Number
- CN202420643795.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-03-29
AI Technical Summary
In the existing combined MTBE and butene-1 devices, the unqualified MTBE products generated by the MTBE device during the driving stage are directly transported to the storage and transportation tank area, resulting in waste of resources.
A refining device for unqualified MTBE products is designed, including an MTBE product inspection tank, a qualified MTBE product line, a first pump, a buffer tank and a reaction distillation unit. Through this device, the unqualified MTBE products are converted into qualified MTBE products after refining.
The refining of unqualified MTBE products has been achieved, and all of them have been converted into qualified MTBE products, which has increased economic benefits and realized the recycling and utilization of resources.
Smart Images
Figure CN222605423U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of recycling devices on MTBE and butene-1 combined devices, and in particular to a recycling device for unqualified MTBE products. Background Art
[0002] MTBE (methyltert-butylether) is a high-octane gasoline additive. Its chemical oxygen content is much lower than that of methanol, which is beneficial for warming up the car and saving fuel. It has low latent heat of evaporation and is beneficial for cold starting. It is often used in the blending of unleaded gasoline and low-lead gasoline.
[0003] There is only one qualified MTBE product line pipeline on the existing MTBE and butene-1 combined unit, so the unqualified MTBE products produced by the MTBE unit during the startup phase can only be transported to the storage tank area. Since the MTBE in the unqualified MTBE products is of high purity, and the unqualified components are basically C4 and methanol, direct transportation to the storage tank area causes a waste of resources. Utility Model Content
[0004] The embodiment of the present application solves the technical problem in the prior art that unqualified MTBE products generated by the MTBE device during the start-up phase are directly transported to the storage tank area, wasting resources, by providing a recycling device for unqualified MTBE products.
[0005] The embodiment of the present application provides a recycling device for unqualified MTBE products, comprising an MTBE product inspection tank, a qualified MTBE product line, a first pump, a buffer tank and a reaction distillation unit; the first input end of the MTBE product inspection tank is connected to the output end of the unqualified MTBE product, and the output end of the MTBE product inspection tank is connected to the input end of the first pump; the output end of the first pump is respectively connected to the input end of the qualified MTBE product line and the input end of the MTBE pipeline; the output end of the first pump is provided with a first regulating valve, and the input end of the qualified MTBE product line is provided with a second regulating valve; the input end of the MTBE pipeline is provided with a third regulating valve; the output end of the MTBE pipeline and the input end of the etherified C4 are both connected to the input end of the buffer tank, and the output end of the buffer tank and the input end of the methanol raw material are both connected to the input end of the reaction distillation unit; the first output end of the reaction distillation unit is connected to the input end of the low-boiling azeotrope, and the second output end of the reaction distillation unit is connected to the second input end of the MTBE product inspection tank.
[0006] In a possible implementation, the recycling device for the unqualified MTBE product further includes a fourth regulating valve; the fourth regulating valve is respectively arranged at the output end of the MTBE pipeline.
[0007] In a possible implementation, the reaction distillation unit includes a product heat exchanger, a lower part of a reaction distillation tower, an upper part of a reaction distillation tower, a reaction tower condenser, a reaction tower reflux tank and an MTBE product cooler; the first input end of the product heat exchanger is connected to the output end of the buffer tank, and the first output end of the product heat exchanger is connected to the first input end of the lower part of the reaction distillation tower; the first output end of the lower part of the reaction distillation tower is connected to the first input end of the upper part of the reaction distillation tower, the second input end of the upper part of the reaction distillation tower is connected to the input end of the methanol feedstock, and the gas phase output end of the upper part of the reaction distillation tower is connected to the reaction tower condenser. The input end of the reaction tower condenser is connected to the input end of the reaction tower reflux tank, the output end of the reaction tower reflux tank is respectively connected to the input end of the low-boiling point azeotrope and the third input end of the upper part of the reaction distillation tower, the liquid phase output end of the upper part of the reaction distillation tower is connected to the second input end of the lower part of the reaction distillation tower, the second output end of the lower part of the reaction distillation tower is connected to the second input end of the product heat exchanger, the second output end of the product heat exchanger is connected to the input end of the MTBE product cooler, and the output end of the MTBE product cooler is connected to the second input end of the MTBE product inspection tank.
[0008] In a possible implementation, the reaction distillation unit also includes a reaction tower reboiler; the input end of the reaction tower reboiler is connected to the third output end of the lower part of the reaction distillation tower; the output end of the reaction tower reboiler is connected to the third input end of the lower part of the reaction distillation tower.
[0009] In a possible implementation, the reaction distillation unit also includes a second pump, a third pump and a fourth pump; the input end of the second pump is connected to the output end of the buffer tank, and the output end of the second pump is connected to the first input end of the product heat exchanger; the input end of the third pump is connected to the liquid phase output end of the upper part of the reaction distillation tower, and the output end of the third pump is connected to the second input end of the lower part of the reaction distillation tower; the input end of the fourth pump is connected to the input end of the reaction tower reflux tank, and the output end of the fourth pump is respectively connected to the third input end of the upper part of the reaction distillation tower and the input end of the low-boiling point azeotrope.
[0010] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects: the refining device of the unqualified MTBE product provided in the embodiments of the present application includes an MTBE product inspection tank, a qualified MTBE product line, a first pump, a buffer tank and a reaction distillation unit. In actual operation, the unqualified MTBE product produced by the MTBE unit enters the first input end of the MTBE product inspection tank; the first regulating valve is opened, and the second regulating valve is closed at the same time, and the unqualified MTBE product is transported to the input end of the buffer tank through the first pump and the MTBE pipeline; the etherified C4 is transported to the input end of the buffer tank, and the etherified C4 and the unqualified MTBE product form a mixed C4, and the output end of the buffer tank transports the mixed C4 to the input end of the reaction distillation unit; the methanol feedstock is transported to the input end of the reaction distillation unit, and under the action of the catalyst of the reaction distillation unit , methanol reacts with residual isobutylene in mixed C4 to generate MTBE; after two processes of reaction and distillation, the isobutylene content in mixed C4 is reduced to below 0.25%, and the MTBE product, C4 and residual methanol generated by the reaction are completely separated; the separated C4 and residual methanol form a low-boiling point azeotrope and are transported to the next unit, and the separated MTBE product is transported to the second input end of the MTBE product inspection tank. After passing the inspection, the second regulating valve is opened, and the third regulating valve is closed to transport the qualified MTBE to the qualified MTBE product line. Therefore, the refining device for unqualified MTBE products in the embodiment of the present application converts all unqualified MTBE products into qualified MTBE product delivery devices after refining, increases economic benefits and realizes resource recycling, and has a reasonable structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0012] Figure 1 A schematic diagram of the structure of a recycling device for unqualified MTBE products provided in an embodiment of the present application.
[0013] Figure markings: 1-MTBE product inspection tank; 2-first pump; 21-first regulating valve; 22-second regulating valve; 3-qualified MTBE product line; 4-MTBE pipeline; 5-etherified C4; 6-buffer tank; 61-third regulating valve; 62-second pump; 63-fourth regulating valve; 7-methanol feedstock; 8-reaction distillation unit; 81-product heat exchanger; 82-MTBE product cooler; 83-lower part of reaction distillation tower; 84-reaction tower reboiler; 85-third pump; 86-upper part of reaction distillation tower; 87-reaction tower condenser; 88-reaction tower reflux tank; 89-fourth pump; 9-low-boiling azeotrope; 10-unqualified MTBE product. DETAILED DESCRIPTION
[0014] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0015] In the description of the embodiments of the present application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not 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 cannot be understood as a limitation on the present application. The terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, 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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.
[0016] The present application embodiment provides a recycling device for unqualified MTBE products, such as Figure 1As shown. The refining device of the unqualified MTBE product includes an MTBE product inspection tank 1, a qualified MTBE product line 3, a first pump 2, a buffer tank 6 and a reactive distillation unit 8. The first input end of the MTBE product inspection tank 1 is connected to the output end of the unqualified MTBE product 10, and the output end of the MTBE product inspection tank 1 is connected to the input end of the first pump 2. The output end of the first pump 2 is respectively connected to the input end of the qualified MTBE product line 3 and the input end of the MTBE pipeline 4. The output end of the first pump 2 is provided with a first regulating valve 21, and the input end of the qualified MTBE product line 3 is provided with a second regulating valve 22. The input end of the MTBE pipeline 4 is provided with a third regulating valve 61. The output end of the MTBE pipeline 4 and the input end of the etherified carbon four 5 are both connected to the input end of the buffer tank 6, and the output end of the buffer tank 6 and the input end of the methanol raw material 7 are both connected to the input end of the reactive distillation unit 8. The first output end of the reaction distillation unit 8 is connected to the input end of the low boiling point azeotrope 9, and the second output end of the reaction distillation unit 8 is connected to the second input end of the MTBE product inspection tank 1. The low boiling point azeotrope 9 of the embodiment of the present application is a low boiling point azeotrope 9 formed by C4 and methanol.
[0017] It should be noted that, in actual operation, the unqualified MTBE product 10 produced by the MTBE unit enters the first input end of the MTBE product inspection tank 1; the first regulating valve 21 is opened, and the second regulating valve 22 is closed at the same time, and the unqualified MTBE product 10 is transported to the input end of the buffer tank 6 through the first pump 2 and the MTBE pipeline 4; the etherified C4 5 is transported to the input end of the buffer tank 6, and the etherified C4 5 and the unqualified MTBE product 10 form a mixed C4, and the output end of the buffer tank 6 transports the mixed C4 to the input end of the reaction distillation unit 8; the methanol feedstock 7 is transported to the input end of the reaction distillation unit 8, and in the reaction distillation Under the action of the catalyst of the distillation unit 8, methanol and residual isobutylene in the mixed C4 react to generate MTBE; after two processes of reaction and distillation, the isobutylene content in the mixed C4 is reduced to less than 0.25%, and the MTBE product, C4 and residual methanol generated by the reaction are completely separated; the separated C4 and residual methanol form a low-boiling azeotrope 9 and are transported to the next unit, and the separated MTBE product is transported to the second input end of the MTBE product inspection tank 1. After passing the inspection, the second regulating valve 22 is opened, and the third regulating valve 61 is closed to transport the qualified MTBE to the qualified MTBE product line 3. Therefore, the refining device of the unqualified MTBE product of the embodiment of the present application converts all the unqualified MTBE products 10 into qualified MTBE product delivery devices after refining, increases economic benefits and realizes resource recycling, and has a reasonable structure.
[0018] In the embodiment of the present application, the recycling device of the unqualified MTBE product further includes a fourth regulating valve 63. The fourth regulating valve 63 is arranged at the output end of the MTBE pipeline 4. The fourth regulating valve 63 of the embodiment of the present application can adjust the flow rate entering the buffer tank 6.
[0019] In the embodiment of the present application, the reaction distillation unit 8 includes a product heat exchanger 81, a reaction distillation tower lower part 83, a reaction distillation tower upper part 86, a reaction tower condenser 87, a reaction tower reflux tank 88 and an MTBE product cooler 82. The first input end of the product heat exchanger 81 is connected to the output end of the buffer tank 6, and the first output end of the product heat exchanger 81 is connected to the first input end of the reaction distillation tower lower part 83. The first output end of the reaction distillation tower lower part 83 is connected to the first input end of the reaction distillation tower upper part 86, the second input end of the reaction distillation tower upper part 86 is connected to the input end of the methanol feedstock 7, the gas phase output end of the reaction distillation tower upper part 86 is connected to the input end of the reaction tower condenser 87, the output end of the reaction tower condenser 87 is connected to the input end of the reaction tower reflux tank 88, the output end of the reaction tower reflux tank 88 is respectively connected to the input end of the low-boiling point azeotrope 9 and the third input end of the reaction distillation tower upper part 86, the liquid phase output end of the reaction distillation tower upper part 86 is connected to the second input end of the reaction distillation tower lower part 83, the second output end of the reaction distillation tower lower part 83 is connected to the second input end of the product heat exchanger 81, the second output end of the product heat exchanger 81 is connected to the input end of the MTBE product cooler 82, and the output end of the MTBE product cooler 82 is connected to the second input end of the MTBE product inspection tank 1.
[0020] It should be noted that the upper part 86 of the reaction distillation tower is located at the top of the lower part 83 of the reaction distillation tower. In the upper part 86 of the reaction distillation tower, the heavy component (MTBE) and the light component (low-boiling azeotrope 9) are separated. The heavy component flows to the bottom of the upper part 86 of the reaction distillation tower, and the light component flows to the top of the upper part 86 of the reaction distillation tower in a gas phase. In the rising carbon four, the concentration of MTBE gradually decreases, and the driving force of the reverse reaction of MTBE gradually decreases until it disappears, so that the reaction of the residual isobutylene in the mixed carbon four and methanol to synthesize MTBE breaks through the limitation of the equilibrium conversion rate, and proceeds similarly to a single reaction, thereby achieving the purpose of improving the conversion rate of isobutylene. When distilling and separating carbon four and MTBE, methanol can form a low-boiling azeotrope 9 with carbon four and be discharged from the top of the upper part 86 of the reaction distillation tower, and MTBE is discharged from the bottom of the upper part 86 of the reaction distillation tower.
[0021] In the embodiment of the present application, the reaction distillation unit 8 further includes a reaction tower reboiler 84. The input end of the reaction tower reboiler 84 is connected to the third output end of the reaction distillation tower lower part 83. The output end of the reaction tower reboiler 84 is connected to the third input end of the reaction distillation tower lower part 83. The reaction tower reboiler 84 heats the mixture so that it circulates in the reaction distillation tower lower part 83, thereby improving the reaction speed and efficiency.
[0022] In the embodiment of the present application, the reaction distillation unit 8 also includes a second pump 62, a third pump 85 and a fourth pump 89. The input end of the second pump 62 is connected to the output end of the buffer tank 6, and the output end of the second pump 62 is connected to the first input end of the product heat exchanger 81. The input end of the third pump 85 is connected to the liquid phase output end of the upper part 86 of the reaction distillation tower, and the output end of the third pump 85 is connected to the second input end of the lower part 83 of the reaction distillation tower. The input end of the fourth pump 89 is connected to the input end of the reaction tower reflux tank 88, and the output end of the fourth pump 89 is respectively connected to the third input end of the upper part 86 of the reaction distillation tower and the input end of the low-boiling azeotrope 9. The second pump 62, the third pump 85 and the fourth pump 89 can increase the energy of the fluid and increase the pressure of the fluid so that it can overcome the resistance in the pipeline system and reach a higher flow rate or height.
[0023] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.
[0024] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.
Claims
1. A recycling device for unqualified MTBE products, characterized in that: It includes an MTBE product inspection tank (1), a qualified MTBE product line (3), a first pump (2), a buffer tank (6) and a reactive distillation unit (8); The first input end of the MTBE product inspection tank (1) is connected to the output end of the unqualified MTBE product (10), and the output end of the MTBE product inspection tank (1) is connected to the input end of the first pump (2); The output end of the first pump (2) is respectively connected to the input end of the qualified MTBE product line (3) and the input end of the MTBE pipeline (4); The output end of the first pump (2) is provided with a first regulating valve (21), the input end of the qualified MTBE product line (3) is provided with a second regulating valve (22), and the input end of the MTBE pipeline (4) is provided with a third regulating valve (61); The output end of the MTBE pipeline (4) and the input end of the etherified C4 (5) are both connected to the input end of the buffer tank (6), and the output end of the buffer tank (6) and the input end of the methanol feedstock (7) are both connected to the input end of the reactive distillation unit (8); The first output end of the reaction distillation unit (8) is connected to the input end of the low-boiling azeotrope (9), and the second output end of the reaction distillation unit (8) is connected to the second input end of the MTBE product inspection tank (1).
2. The recycling device for unqualified MTBE products according to claim 1, characterized in that: Also includes a fourth regulating valve (63); The fourth regulating valves (63) are respectively arranged at the output ends of the MTBE pipelines (4).
3. The refining device for unqualified MTBE products according to claim 1, characterized in that: The reaction distillation unit (8) comprises a product heat exchanger (81), a reaction distillation tower lower part (83), a reaction distillation tower upper part (86), a reaction tower condenser (87), a reaction tower reflux tank (88) and an MTBE product cooler (82); The first input end of the product heat exchanger (81) is connected to the output end of the buffer tank (6), and the first output end of the product heat exchanger (81) is connected to the first input end of the lower part (83) of the reaction distillation tower; The first output end of the lower part (83) of the reaction distillation tower is connected to the first input end of the upper part (86) of the reaction distillation tower, the second input end of the upper part (86) of the reaction distillation tower is connected to the input end of the methanol feedstock (7), the gas phase output end of the upper part (86) of the reaction distillation tower is connected to the input end of the reaction tower condenser (87), the output end of the reaction tower condenser (87) is connected to the input end of the reaction tower reflux tank (88), and the output end of the reaction tower reflux tank (88) is connected to the input end of the low boiling point azeotrope (9). The liquid phase output end of the upper part (86) of the reaction distillation tower is connected to the second input end of the lower part (83) of the reaction distillation tower, the second output end of the lower part (83) of the reaction distillation tower is connected to the second input end of the product heat exchanger (81), the second output end of the product heat exchanger (81) is connected to the input end of the MTBE product cooler (82), and the output end of the MTBE product cooler (82) is connected to the second input end of the MTBE product inspection tank (1).
4. The recycling device for unqualified MTBE products according to claim 3, characterized in that: The reactive distillation unit (8) further comprises a reaction tower reboiler (84); The input end of the reaction tower reboiler (84) is connected to the third output end of the lower part (83) of the reaction distillation tower; The output end of the reaction tower reboiler (84) is connected to the third input end of the lower part (83) of the reaction distillation tower.
5. The refining device for unqualified MTBE products according to claim 4, characterized in that: The reactive distillation unit (8) further comprises a second pump (62), a third pump (85) and a fourth pump (89); The input end of the second pump (62) is connected to the output end of the buffer tank (6), and the output end of the second pump (62) is connected to the first input end of the product heat exchanger (81); The input end of the third pump (85) is connected to the liquid phase output end of the upper part (86) of the reaction distillation tower, and the output end of the third pump (85) is connected to the second input end of the lower part (83) of the reaction distillation tower; The input end of the fourth pump (89) is connected to the input end of the reaction tower reflux tank (88), and the output end of the fourth pump (89) is respectively connected to the third input end of the upper part (86) of the reaction distillation tower and the input end of the low-boiling azeotrope (9).