System for reducing MTBE chromaticity
By introducing product weight removal towers and related equipment in the MTBE production process, the distillation method with different boiling point and chromaticity is solved, and the deep decolorization and purity improvement of MTBE is achieved.
Patent Information
- Application Number
- CN202421505978.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-28
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-06-28
AI Technical Summary
In the prior art, the MTBE component has a high product chrominance due to the high color recombinant components, which cannot meet the requirements of high-grade products.
The distillation method is used to enter the product dehumidification tower through the bottom of the catalytic distillation tower. Using the boiling point and chromaticity difference, the components with high boiling point and high chromaticity are removed, and equipment such as dehumidification tower, dehumidification tower reflux tank, recombination cooler are installed to achieve deep dehumidification.
Through the distillation method, the color of MTBE is reduced from 30-50 to colorless and transparent, and the purity is increased to more than 99%, reaching the standard of high-grade products.
Smart Images
Figure CN223082274U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of methyl tert-butyl ether production, in particular to a system for reducing the chromaticity of MTBE. Background Art
[0002] MTBE (methyl tert-butyl ether), with the molecular formula C5H 12 O, the structural formula CH3-O-C(CH3)3, the molecular weight 88.15, and the boiling point 55.2°C, is produced by the addition reaction of isobutene and methanol in liquefied petroleum gas (C4 fraction). MTBE is not only a high-octane clean gasoline blending component but also a raw material for cracking to produce high-purity isobutene, and is an important petrochemical raw material and product.
[0003] The MTBE component is different from MTBE. The patent "A MTBE Component and Liquefied Gas Produced from Ether-Containing C4 and Its Preparation Method" with the patent number 201711205227x introduced the MTBE component in detail. The MTBE component includes MTBE, ETBE, aromatics, heavy paraffins, olefins, etc. Since the MTBE component contains heavy components with a high chromaticity, the chromaticity of its product is high and does not meet the requirements of premium products. Summary of the Utility Model
[0004] In view of the defects of the prior art, the utility model provides a system for reducing the chromaticity of MTBE, which sends the bottom feed of the catalytic distillation column into the product deweighting column through the deweighting column feed pipeline, so as to remove components with high boiling points and heavy chromaticity from the MTBE component produced by the MTBE device through the rectification method, achieving the purpose of deep decolorization of MTBE.
[0005] To achieve the above purpose, the technical solution provided by the utility model is a system for reducing the chromaticity of MTBE, which includes a deweighting column feed pipeline, a product deweighting column, a deweighting column overhead air cooler, a deweighting column reflux drum, and a heavy component cooler; the deweighting column feed pipeline is led out from the MTBE device; the product deweighting column is connected to the deweighting column feed pipeline; the deweighting column overhead air cooler is connected to the top of the product deweighting column; the deweighting column reflux drum is connected to the deweighting column overhead air cooler, the deweighting column reflux drum is connected to the product deweighting column through a reflux pipeline, and the reflux pipeline is connected to the MTBE product tank area through a decolorized MTBE product pipeline; the heavy component cooler is connected to the bottom of the product deweighting column.
[0006] Further, a deweighting column reflux pump is provided on the reflux pipeline, and the decolorized MTBE product pipeline meets the reflux pipeline downstream of the deweighting column reflux pump.
[0007] Further, a decolorized MTBE cooler is provided on the decolorized MTBE product pipeline.
[0008] Furthermore, the top of the de - heavy - component tower reflux drum is connected to the flare pipeline.
[0009] Furthermore, the product de - heavy - component tower is connected to the heavy - component cooler through the de - heavy - component tower discharge pipeline, and a heavy - component pump is arranged on the de - heavy - component tower discharge pipeline.
[0010] Furthermore, the bottom of the product de - heavy - component tower is connected with a de - heavy - component tower reboiler.
[0011] Furthermore, the 1.0 MPa steam pipeline is connected to the de - heavy - component tower reboiler, and the de - heavy - component tower reboiler is connected to the heavy - component condensate tank through the condensate pipeline.
[0012] Furthermore, the heavy - component cooler is connected with a heavy - component discharge pipeline, and a flow - regulating valve is arranged on the heavy - component discharge pipeline.
[0013] Furthermore, the MTBE unit includes an autocatalytic distillation tower, and the de - heavy - component tower feed pipeline is led out from the bottom of the autocatalytic distillation tower.
[0014] The desulfurization method includes the following steps:
[0015] Step S100: Feed the MTBE component produced by the MTBE unit into the product de - heavy - component tower through the de - heavy - component tower feed pipeline at a feed rate of 30 t / h to 100 t / h. Control the bottom temperature of the product de - heavy - component tower at 90°C to 120°C, the top temperature at 60°C to 90°C, the top pressure at 0.08 MPa to 0.28 MPa, and the reflux ratio at 0.1 to 1 to remove the heavy components with boiling points higher than MTBE (methyl tert - butyl ether).
[0016] Step S200: Cool the decolorized MTBE product from which the heavy components have been removed in step S100 through the de - heavy - component tower overhead air cooler, and then pass it through the de - heavy - component tower reflux drum, and send it to the unit through the decolorized MTBE product pipeline.
[0017] The beneficial effects of the present utility model: Utilize the principle of rectification and decolorization, that is, rely on the difference in boiling points between the heavy components with higher chromaticity and MTBE to remove them through the rectification method. The material from the bottom of the autocatalytic distillation tower is fed into the product de - heavy - component tower through the de - heavy - component tower feed pipeline, so as to remove the components with high boiling points and heavy chromaticity from the MTBE component produced by the MTBE unit through the rectification method, achieving the purpose of deep decolorization of MTBE. Description of the Drawings
[0018] Figure 1 It is the process flow diagram of a system for reducing the chromaticity of MTBE in an embodiment of the present utility model;
[0019] In the figure:
[0020] 100. Deweighting tower feed pipeline
[0021] 200. Product deweighting tower, 210. Deweighting tower product pipeline, 211. Heavy component pump, 220. Deweighting tower reboiler, 221. 1.0 MPa steam pipeline, 222. Condensate pipeline, 223. Heavy component condensate tank
[0022] 300. Deweighting tower overhead air cooler
[0023] 400. Deweighting tower reflux drum, 410. Reflux pipeline, 411. Deweighting tower reflux pump, 420. Decolorized MTBE product pipeline, 421. Decolorized MTBE cooler, 430. MTBE product storage area, 440. Flare pipeline, 450. Nitrogen pipeline
[0024] 500. Heavy component cooler, 510. Heavy component product pipeline, 511. Flow regulating valve Detailed implementation manners
[0025] To make the above objects, features and advantages of the present utility model more obvious and understandable, the following will describe the detailed implementation manners of the present utility model with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.
[0026] See Figure 1 , which shows the process flow diagram of a system for reducing the colority of MTBE in an embodiment of the present utility model. It includes a deweighting tower feed pipeline 100, a product deweighting tower 200, a deweighting tower overhead air cooler 300, a deweighting tower reflux drum 400 and a heavy component cooler 500. The deweighting tower feed pipeline 100 is led out from the MTBE unit; the product deweighting tower 200 is connected to the deweighting tower feed pipeline 100; the deweighting tower overhead air cooler 300 is connected to the top of the product deweighting tower 200; the deweighting tower reflux drum 400 is connected to the deweighting tower overhead air cooler 300, and the deweighting tower reflux drum 400 is connected to the product deweighting tower 200 through a reflux pipeline 410, and the reflux pipeline 410 is connected to the MTBE product storage area 430 through a decolorized MTBE product pipeline 420; the heavy component cooler 500 is connected to the bottom of the product deweighting tower 200.
[0027] Table 1 is a comparison table of products before and after deweighting;
[0028]
[0029] Referring to Table 1, the above system for reducing the chromaticity of MTBE is provided with a product de - heavy tower 200. The bottom feed of the self - catalytic distillation tower is sent into the product de - heavy tower 200 through the de - heavy tower feed pipeline 100, so as to remove the components with high boiling points and heavy chromaticity from the MTBE components produced by the MTBE unit through the rectification method, achieving the purpose of deep decolorization of MTBE. Through this decolorization method, the platinum - cobalt chromaticity of MTBE is increased from about 30 - 50 to colorless and transparent, and at the same time, the purity of MTBE is increased from about 98.5% to over 99%, meeting the superior grade product standard.
[0030] The desulfurization method includes the following steps:
[0031] Step S100: Feed the MTBE components produced by the MTBE unit into the product de - heavy tower 200 through the de - heavy tower feed pipeline 100 at a feed rate of 30 t / h to 100 t / h. Control the bottom temperature of the product de - heavy tower 200 at 90°C to 120°C, the top temperature at 60°C to 90°C, the top pressure at 0.08 MPa to 0.28 MPa, and the reflux ratio at 0.1 to 1 to remove the heavy components with boiling points higher than MTBE.
[0032] Step S200: Cool the decolorized MTBE product from which the heavy components have been removed in step S100 through the de - heavy tower overhead air cooler 300, and then send it to the unit through the decolorized MTBE product pipeline 420.
[0033] In one embodiment, a de - heavy tower reflux pump 411 is provided on the reflux pipeline 410, and the decolorized MTBE product pipeline 420 meets the reflux pipeline 410 downstream of the de - heavy tower reflux pump 411.
[0034] In one embodiment, a decolorized MTBE cooler 421 is provided on the decolorized MTBE product pipeline 420.
[0035] In one embodiment, the top of the de - heavy tower reflux drum 400 is connected to the flare pipeline 440. The nitrogen pipeline 450 is connected to the top of the de - heavy tower reflux drum 400.
[0036] In one embodiment, the product de - heavy tower 200 is connected to the heavy - component cooler 500 through the de - heavy tower discharge pipeline 210, and a heavy - component pump 211 is provided on the de - heavy tower discharge pipeline 210.
[0037] In one embodiment, the bottom of the product de - heavy tower 200 is connected with a de - heavy tower reboiler 220. The de - heavy tower reboiler 220 is provided at the bottom of the product de - heavy tower 200, using 1.0 MPa (G) steam as the heat source. The top operating temperature is 76.5°C, and the top operating pressure is 0.17 MPa (G).
[0038] In one embodiment, the 1.0 MPa steam pipeline 221 is connected to the de-heavy tower reboiler 220, and the de-heavy tower reboiler 220 is connected to the heavy component condensate tank 223 through the condensate pipeline 222.
[0039] In one embodiment, the heavy component cooler 500 is connected with a heavy component discharge pipeline 510, and a flow regulating valve 511 is arranged on the heavy component discharge pipeline 510.
[0040] In one embodiment, the MTBE unit includes an autocatalytic distillation column. The de-heavy tower feed pipeline 100 is led out from the bottom of the autocatalytic distillation column to introduce MTBE components. It should be noted that the de-heavy tower feed pipeline 100 is not limited to being connected to the bottom of the autocatalytic distillation column, and can also be connected to other devices, as long as it can introduce the MTBE components produced by the MTBE unit into the de-heavy tower feed pipeline 100, and is fed into the product de-heavy tower 200 at a feed rate of 30 t / h to 100 t / h through the de-heavy tower feed pipeline 100.
[0041] The above system for reducing the chromaticity of MTBE is provided with a product de-heavy tower 200. The MTBE components directly enter the product de-heavy tower 200 through the de-heavy tower feed pipeline 100. After being separated by distillation in the de-heavy tower 200, the MTBE product produced at the top of the de-heavy tower 200 enters the de-heavy tower reflux tank 400 after being cooled by the de-heavy tower overhead air cooler 300, and then after being boosted by the de-heavy tower reflux pump 411, a part of it returns to the top of the product de-heavy tower 200 as reflux, and the other part is cooled to 40 °C by the decolorized MTBE cooler 421 and then sent to the MTBE product tank area 430; the heavy components at the bottom of the tower are pumped out by the heavy component pump, and then cooled to 40 °C by the heavy component cooler 500 and sent out of the unit.
[0042] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 to the present invention.
[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.
[0044] In the present utility model, unless otherwise clearly specified and defined, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0045] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.
[0046] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.
Claims
1. A system for reducing the chromaticity of MTBE, characterized in that: including a deweighting tower feed pipeline, led out from the MTBE unit; a product deweighting tower, connected to the deweighting tower feed pipeline; a deweighting tower overhead air cooler, connected to the top of the product deweighting tower; a deweighting tower reflux drum, connected to the deweighting tower overhead air cooler, the deweighting tower reflux drum is connected to the product deweighting tower through a reflux pipeline, and the reflux pipeline is connected to the MTBE product tank area through a decolorized MTBE product pipeline; a heavy component cooler, connected to the bottom of the product deweighting tower.
2. The system for reducing the chromaticity of MTBE according to claim 1, characterized in that: The reflux pipeline is provided with a deweighting tower reflux pump, and the decolorized MTBE product pipeline meets the reflux pipeline downstream of the deweighting tower reflux pump.
3. The system for reducing the chromaticity of MTBE according to claim 2, characterized in that: The decolorized MTBE product pipeline is provided with a decolorized MTBE cooler.
4. A system for reducing the chromaticity of MTBE according to any one of claims 1-3, characterized in that: The top of the deweighting tower reflux drum is connected to a flare pipeline.
5. A system for reducing the chromaticity of MTBE according to any one of claims 1 - 3, characterized in that: The product deweighting tower is connected to the heavy component cooler through a deweighting tower discharge pipeline, and the deweighting tower discharge pipeline is provided with a heavy component pump.
6. A system for reducing the chromaticity of MTBE according to any one of claims 1-3, characterized in that: The bottom of the product deweighting tower is connected with a deweighting tower reboiler.
7. A system for reducing the chromaticity of MTBE according to claim 6, characterized in that: A 1.0 MPa steam pipeline is connected to the deweighting tower reboiler, and the deweighting tower reboiler is connected to a heavy component condensate tank through a condensate pipeline.
8. A system for reducing the chromaticity of MTBE according to any one of claims 1-3, characterized in that: The heavy component cooler is connected with a heavy component discharge pipeline, and the heavy component discharge pipeline is provided with a flow regulating valve.
9. A system for reducing the chromaticity of MTBE according to any one of claims 1-3, characterized in that: The MTBE unit includes an autocatalytic distillation tower, and the deweighting tower feed pipeline is led out from the bottom of the autocatalytic distillation tower.