An alkylation system for processing C3-C5+ components

Abstract

The utility model aims at providing a kind of alkylating system of processing C3-C5+ component, including ether post carbon four production device, alkylating reactor and product tank, ether post carbon four production device and C3-C5+ component storage tank are jointly connected to raw material buffer tank, C3-C5+ component storage tank and raw material buffer tank between being equipped with the pretreatment unit for the pretreatment C3-C5+ component, pretreatment unit includes the water washing mixer, water washing tank and dehydrator connected in turn, water washing mixer entrance is connected with C3-C5+ component storage tank outlet, dehydrator outlet is connected with raw material buffer tank entrance, for providing the process water tank used water in water washing process and water washing mixer connection, raw material buffer tank is connected to alkylating reactor, and raw material feeding pump is equipped on the pipeline between alkylating reactor and raw material buffer tank, and alkylating reactor outlet is connected with product tank entrance.The utility model aims at avoiding the problem that C3-C5+ component is introduced into alkylating system with low efficiency and high cost.

Description

Technical Field

[0001] This utility model relates to the field of petroleum refining, specifically to an alkylation system for processing C3-C5+ components. Background Technology

[0002] Alkylation is a process that reacts isobutane with olefins under the action of an acidic catalyst to produce high-octane alkylate. Ideally, the molar ratio of isobutane to olefins should be close to 1:1 to ensure sufficient reaction. In actual production, the feedstock for alkylation is post-etherified C4, which typically contains around 45% isobutane but between 28% and 32% olefins. This lower olefin content keeps the alkylate yield around 60%. The preparation of post-etherified C4 feedstock is mainly affected by the feed characteristics and production parameters of the post-etherified C4 production unit. When the feed characteristics and production parameters of the post-etherified C4 production unit are stable, the possibility of adjusting the ratio of isobutane to olefins in the post-etherified C4 is relatively small.

[0003] In fact, C3-C5+ olefins can all undergo alkylation with isobutane under acidic conditions to increase the yield of alkylated oil. Furthermore, C5+ alkanes can be directly introduced into the alkylated oil to improve its yield. C3-C5+ olefins and C5+ alkanes (collectively referred to as C3-C5+ components) are common raw materials and reaction byproducts in petrochemical plants. Therefore, introducing C3-C5+ components into the alkylation reaction can increase the yield of alkylated oil. However, existing alkylation units only have the capability for post-ether C4 processing, and petrochemical companies have accumulated a large amount of idle pipelines and equipment due to equipment upgrades and technological iterations. How to utilize idle equipment has always been a coexisting problem for petrochemical companies. Currently, the methods for introducing C3-C5+ components into the alkylation system include manual addition, pumping, or custom-designed new equipment. However, manual addition and pumping are inefficient and labor-intensive, while custom-designed new equipment is costly and cannot reuse existing equipment. Utility Model Content

[0004] The present invention aims to provide an alkylation system for processing C3-C5+ components, so as to avoid the problems of low efficiency and high cost of introducing C3-C5+ components into the alkylation system.

[0005] To solve the above technical problems, the specific solution adopted by this utility model is as follows: it includes a post-etherification C4 production device, an alkylation reactor, and a finished product tank. The post-etherification C4 production device and the C3-C5+ component storage tank are connected to the raw material buffer tank. A pretreatment unit for pretreating the C3-C5+ components is provided between the C3-C5+ component storage tank and the raw material buffer tank. The pretreatment unit includes a water washing mixer, a water washing tank, and a dehydrator connected in sequence. The inlet of the water washing mixer is connected to the outlet of the C3-C5+ component storage tank, and the outlet of the dehydrator is connected to the inlet of the raw material buffer tank. A process water tank for providing water for the water washing process is connected to the water washing mixer. The raw material buffer tank is connected to the alkylation reactor. A raw material feed pump is provided on the pipeline between the alkylation reactor and the raw material buffer tank. The outlet of the alkylation reactor is connected to the inlet of the finished product tank.

[0006] As a further optimization of the alkylation system for processing C3-C5+ components, the pretreatment unit also includes a gas-liquid mixer located between the washing tank and the dehydrator.

[0007] As a further optimization of the alkylation system for processing C3-C5+ components, a second sight glass is provided on the pipeline between the gas-liquid mixer and the dehydrator for observing the mixing effect of materials in the gas-liquid mixer.

[0008] As a further optimization of an alkylation system for processing C3-C5+ components: a first pipe sight glass is provided on the pipeline between the washing mixer and the washing tank for observing the mixing effect of materials in the washing mixer.

[0009] As a further optimization of an alkylation system for processing C3-C5+ components: the bottom of the washing tank is equipped with a pipe connected to the inlet of the washing mixer, and a washing circulation pump is installed on the pipe.

[0010] As a further optimization of an alkylation system for processing C3-C5+ components: a water pump is installed at the outlet of the process water tank.

[0011] As a further optimization of an alkylation system for processing C3-C5+ components: a first drain outlet is provided on the washing tank, and a second drain outlet is provided on the dewatering unit. Both the first and second drain outlets are connected to the wastewater tank.

[0012] As a further optimization of an alkylation system for processing C3-C5+ components: the washing tank is equipped with a sampling port for detecting the washing effect of the material inside the washing tank.

[0013] Beneficial Effects: By modifying the existing alkylation system and introducing the processing of materials rich in C3-C5+ components into the alkylation system, the C3-C5+ components, after water washing and deep dehydration, are added together with the etherified C4 components into the raw material buffer tank to participate in the alkylation reaction as raw materials. This method balances the molar ratio of isobutane and olefins in the raw materials, improving the yield of alkylated oil. This system avoids the problems of inefficient manual feeding and pumping of C3-C5+ components, and the modification of the existing equipment reduces production costs. Since the alkylation unit began blending materials rich in C3-C5+ components, it has generated a cumulative revenue of 25.1 million yuan, creating significant benefits for the company.

[0014] This invention, through the design of a first discharge outlet, a second discharge outlet, and a wastewater tank, avoids the direct discharge of pollutants generated during the pretreatment of C3-C5+ components into the environment. Attached Figure Description

[0015] Figure 1 This is a diagram of the alkylation system for processing C3-C5+ components according to this invention; The diagram is labeled as follows: 1. Process water tank; 2. Water pump; 3. Pretreatment unit; 4. Post-etherification C4 production unit; 5. Alkylation reactor; 6. C3-C5+ component storage tank; 7. Finished product tank; 8. Washing mixer; 9. Gas-liquid mixer; 10. First pipeline sight glass; 11. Second pipeline sight glass; 12. Washing tank; 13. Dehydrator; 14. Sampling port; 15. Feed pump; 16. First drain outlet; 17. Second drain outlet; 18. Circulation pump; 19. Wastewater tank; 20. Raw material buffer tank. Detailed Implementation

[0016] This embodiment employs the SINOALKY sulfuric acid alkylation process to prepare alkylated oil. An alkylation system for processing C3-C5+ components includes a post-etherification C4 production unit 4, a C3-C5+ component storage tank 6, a raw material buffer tank 20, an alkylation reactor 5, and a finished product tank 7. The post-etherification C4 production unit 4 primarily manufactures post-etherification C4 as the raw material for the alkylation reaction. The C3-C5+ component storage tank 6 stores the C3-C5+ components. The raw material buffer tank 20 is used to mix the post-etherification C4 and the processed C3-C5+ components. The alkylation reactor 5 is the site where the raw materials undergo the alkylation reaction. The finished product tank 7 stores the alkylated oil.

[0017] The C3-C5+ component storage tank 6 and the post-ether C4 production unit 4 are connected to the raw material buffer tank 20. A pretreatment unit 3 for pretreating the C3-C5+ components is provided between the C3-C5+ component storage tank 6 and the raw material buffer tank 20. The pretreatment includes water washing and deep dehydration. Water washing is used to remove water-soluble impurities in the raw materials, and deep dehydration is used to remove residual water and water vapor after water washing.

[0018] The pretreatment unit 3 includes a washing mixer 8, a washing tank 12, and a dewatering unit 13 connected in sequence. The inlet of the washing tank 12 is connected to the outlet of the C3-C5+ component storage tank 6, and the outlet of the dewatering unit 13 is connected to the inlet of the raw material buffer tank 20. The process water tank 1, which provides water for the washing process, is connected to the washing mixer 8. The washing water and C3-C5+ components are fully mixed and washed under the action of the washing mixer 8. The mixed material is further washed in the washing tank 12. The washed C3-C5+ components enter the dewatering unit 13. A small amount of water and C3-C5+ components in the washing tank 12 enter the dewatering unit 13 together. The washed C3-C5+ components are dehydrated in the dewatering unit 13 to remove residual washing water.

[0019] The pretreatment unit 3 also includes a gas-liquid mixer 9, which is located between the washing tank 12 and the dewatering unit 13. The gas phase material C3-C5+ components after washing will inevitably carry a small amount of washing water during the discharge process. The gas-liquid mixer 9 fully mixes the C3-C5+ components and the carried washing water. The mixed material is then passed into the dewatering unit 13 for dehydration.

[0020] A first sight glass 10 for observing the mixing effect of materials in the washing mixer 8 is provided on the pipeline between the washing tank 12 and the washing mixer 8.

[0021] The bottom of the washing tank 12 is connected to the inlet of the washing mixer 8 via a pipe. A washing circulation pump 18 is installed on the pipe. The washing tank 12 is equipped with a sampling port 14 for detecting the washing effect of the materials inside. The sampling port 14 can detect the state of the water in the washing tank 12. During the washing process, the replenishment process water pipeline, wastewater discharge pipeline, and circulation water pipeline of the washing tank 12 are all kept open to ensure that the process water inside the washing tank 12 is in a dynamic state of continuous flow and replacement. After the process water cleans the C3-C5+ components, most of the water is returned to the washing mixer 8 for reuse via the circulation water path; some wastewater is discharged to the wastewater tank 19 to maintain the tank's liquid level balance; a small portion of the water follows the C3-C5+ components into subsequent processes. If the cleaned C3-C5+ components fail to meet production requirements, the wastewater discharge can be increased and more fresh process water can be added accordingly to use cleaner water for deep cleaning, thereby improving the cleaning effect.

[0022] The washing tank 12 is provided with a first drain outlet 16, and the dewatering device 13 is provided with a second drain outlet 17. Both the first drain outlet 16 and the second drain outlet 17 are connected to the wastewater tank 19. The wastewater tank 19 is used to store the wastewater generated during the pretreatment of C3-C5+ components and the wastewater generated during the cleaning system process.

[0023] The process water tank 1 is equipped with a water pump 2 at its outlet. The process water tank 1 is connected to the washing mixer 8 to provide the washing water required during the washing process and for daily rinsing and maintenance. The water pump 2 accelerates the flow rate of the washing water in the pipeline and improves work efficiency.

[0024] A second sight glass 11 is provided on the pipeline between the dehydrator 13 and the gas-liquid mixer 9 for observing the mixing effect of materials in the gas-liquid mixer 9.

[0025] The outlet of dehydrator 13 and the post-etherification C4 production unit 4 are both connected to the feed buffer tank 20. The pretreated C3-C5+ components and the post-etherification C4 components are thoroughly mixed in the feed buffer tank 20, which also has a certain dehydration function. After being fully dehydrated in the feed buffer tank 20, the mixed feed is then fed into the alkylation reactor 5. The raw material buffer tank 20 is connected to the alkylation reactor 5. A raw material feed pump 15 is installed on the pipeline between the alkylation reactor 5 and the raw material buffer tank 20. The outlet of the alkylation reactor 5 is connected to the inlet of the finished product tank 7. The raw materials in the raw material buffer are fed into the alkylation reactor 5 by the raw material feed pump 15. The alkylated oil obtained after the reaction is stored in the finished product tank 7.

[0026] The method of using the alkylation system for processing C3-C5+ components of this utility model is as follows: The post-etherification C4 production unit 4 is started to prepare post-etherification C4 and transported to the raw material buffer tank 20; C3-C5+ components are washed by injecting the C3-C5+ components in the C3-C5+ component storage tank 6 and the washing water in the process water tank 1 into the washing mixer 8 for mixing; the mixed material is then passed into the washing tank 12 for washing; after washing, the material is passed into the gas-liquid mixer 9 for deep dehydration of the C3-C5+ components. The washed C3-C5+ components are introduced into the gas-liquid mixer 9 to mix with the residual washing water. The mixed material is then sent to the dewatering unit 13 to remove excess process water. After dewatering, the pretreated C3-C5+ components are transported to the raw material buffer tank 20. The pretreated C3-C5+ components and post-etherified C4 are thoroughly mixed in the raw material buffer tank 20 and then introduced into the alkylation reactor 5. The raw materials are fully reacted in the alkylation reactor 5, and the resulting alkylated oil product is transported to the finished product tank 7 for storage. The waste liquid generated during the pretreatment of the C3-C5+ components and the wastewater generated during daily cleaning are discharged into the wastewater tank 19 through the first drain outlet 16 and the second drain outlet 17.

[0027] This embodiment introduces C3-C5+ components into the SINOALKY sulfuric acid alkylation process, which broadens the raw material processing range of the SINOALKY sulfuric acid alkylation reaction. Furthermore, by introducing C3-C5+ components with downstream processing issues into the SINOALKY sulfuric acid alkylation process, the problem of difficult downstream processing of this material can be solved, and the yield of alkylated oil can be improved while reducing energy costs. Simultaneously, the C3-C5+ component pretreatment unit 3 in this embodiment is a modification of the company's discontinued propane extraction equipment. The modified equipment can generate an average annual profit of approximately 5 million yuan.

Claims

1. An alkylation system for processing C3-C5+ components, comprising a post-etherification C4 production unit (4), an alkylation reactor (5), and a finished product tank (7), characterized in that: The post-ether C4 production unit (4) and the C3-C5+ component storage tank (6) are connected to the raw material buffer tank (20). A pretreatment unit (3) for pretreating C3-C5+ components is provided between the C3-C5+ component storage tank (6) and the raw material buffer tank (20). The pretreatment unit (3) includes a water washing mixer (8), a water washing tank (12) and a dehydrator (13) connected in sequence. The inlet of the water washing mixer (8) is connected to the outlet of the C3-C5+ component storage tank (6), and the outlet of the dehydrator (13) is connected to the inlet of the raw material buffer tank (20). The process water tank (1) for providing water for the water washing process is connected to the water washing mixer (8). The raw material buffer tank (20) is connected to the alkylation reactor (5). A raw material feed pump (15) is provided on the pipeline between the alkylation reactor (5) and the raw material buffer tank (20). The outlet of the alkylation reactor (5) is connected to the inlet of the finished product tank (7).

2. The alkylation system for processing C3-C5+ components according to claim 1, characterized in that: The pretreatment unit (3) also includes a gas-liquid mixer (9), which is located between the washing tank (12) and the dewatering unit (13).

3. The alkylation system for processing C3-C5+ components according to claim 2, characterized in that: A second pipe sight glass (11) is provided on the pipeline between the gas-liquid mixer (9) and the dehydrator (13) for observing the mixing effect of materials in the gas-liquid mixer (9).

4. The alkylation system for processing C3-C5+ components according to claim 1, characterized in that: A first pipe sight glass (10) is provided on the pipeline between the washing mixer (8) and the washing tank (12) for observing the mixing effect of materials in the washing mixer (8).

5. An alkylation system for processing C3-C5+ components according to claim 1, characterized in that: The bottom of the washing tank (12) is provided with a pipe connected to the inlet of the washing mixer (8), and a washing circulation pump (18) is provided on the pipe.

6. An alkylation system for processing C3-C5+ components according to claim 1, characterized in that: The process water tank (1) is equipped with a water pump (2) at its outlet.

7. An alkylation system for processing C3-C5+ components according to claim 1, characterized in that: The washing tank (12) is provided with a first drain outlet (16), and the dewatering device (13) is provided with a second drain outlet (17). Both the first drain outlet (16) and the second drain outlet (17) are connected to the wastewater tank (19).

8. An alkylation system for processing C3-C5+ components according to claim 1, characterized in that: The washing tank (12) is equipped with a sampling port (14) for testing the washing effect of the material inside the washing tank (12).

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