Olefin oligomerization pickling tower

Abstract

The utility model relates to the technical field of alkali washing and water washing for olefin oligomerization containing trace phosphoric acid, and discloses an olefin oligomerization pickling tower and an alkali washing system, which are used for further alkali washing substances subjected to pickling treatment in the olefin oligomerization pickling tower so as to remove residual acidic impurities and other harmful substances, and the alkali washing system comprises an alkali washing tower, a bottom liquid outlet I and a top gas outlet I of the alkaline washing tower are connected through a communicating pipeline I, and an alkaline washing tower top condensation cooler is arranged at the top gas outlet I of the alkaline washing tower. According to the utility model, trace phosphoric acid in the reaction product is removed, so that frequent replacement of high-cost parts and the like due to phosphoric acid corrosion can be avoided, and a large amount of equipment purchase and maintenance cost can be saved; and equipment with low material requirements can be used for more stable operation, and the overall operation efficiency and the production benefit of the device are improved.

Description

Technical Field

[0001] This utility model relates to the field of olefin oligomerization with trace amounts of phosphoric acid alkaline washing technology, and particularly to an olefin oligomerization acid washing tower. Background Technology

[0002] Olefin oligomerization is a catalyst-driven polymerization process for olefin molecules, commonly used to produce high-molecular-weight polymers or specific chemicals. This technology stems from in-depth research into the reaction mechanisms of olefins, utilizing catalysts such as Lewis acids or organometallic compounds to achieve highly selective and efficient reactions. This technology has significant applications in industries such as plastics, synthetic fibers, and rubber, significantly improving product performance and economic benefits.

[0003] An olefin oligomerization acid washing tower is a device used to treat byproducts and impurities generated during the olefin oligomerization process. Its main structure includes a vertical tower body, a packing layer, and an acid distribution system. The tower body is typically made of corrosion-resistant materials to withstand acidic environments. The packing layer helps increase the contact area between the liquid and gas, thereby improving acid washing efficiency.

[0004] The oligomerization products of olefins catalyzed by phosphoric acid contain trace amounts of phosphoric acid, which can cause severe corrosion to downstream pipes, valves, and equipment. If these trace amounts of phosphoric acid are not removed, the material grade of downstream equipment needs to be upgraded, thus increasing investment costs. Therefore, an olefin oligomerization acid washing tower is proposed to address this problem. Utility Model Content

[0005] To overcome the above shortcomings, this invention provides an olefin oligomerization acid washing tower, aiming to address the issue in existing technologies where trace amounts of phosphoric acid are present in the olefin oligomerization products catalyzed by phosphoric acid, causing severe corrosion to subsequent pipes, valves, and equipment. If these trace amounts of phosphoric acid are not removed, the material grade of subsequent equipment needs to be upgraded, thus increasing investment costs.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an olefin oligomerization acid washing tower, characterized in that it comprises:

[0007] An alkaline washing system is used to further alkaline wash the substances that have undergone acid washing in the olefin oligomer acid washing tower to remove residual acidic impurities and other harmful substances. The alkaline washing system includes an alkaline washing tower, the bottom liquid outlet and the top gas outlet of the alkaline washing tower are connected by a connecting pipe, and an alkaline washing tower top condenser is installed at one of the top gas outlets of the alkaline washing tower.

[0008] A water washing system is used to perform water washing operations on substances that have undergone acid washing and alkali washing in an olefin oligomer acid washing tower, in order to further remove residual acid, alkali and other impurities. The water washing system includes a water washing tower, and the bottom liquid outlet two and the top gas outlet two of the water washing tower are connected by a connecting pipe two. A water washing tower top condenser is installed on the connecting pipe two. The connecting pipe one is connected to the liquid inlet of the water washing tower through a connecting pipe.

[0009] As a further description of the above technical solution: the alkaline washing system also includes an alkaline solution circulation pump at the bottom of the alkaline washing tower. The input end of the alkaline solution circulation pump at the bottom of the alkaline washing tower is connected to the outlet of the alkaline washing tower through a circulation outlet pipe 1. The output end of the alkaline solution circulation pump at the bottom of the alkaline washing tower is connected to one side of the alkaline washing tower through a circulation return pipe 1.

[0010] As a further description of the above technical solution: the water washing system also includes a water washing tower bottom water circulation pump, the input end of which is connected to the water washing tower outlet four through the circulation outlet pipe two, and the output end of which is connected to one side of the water washing tower through the circulation return pipe two.

[0011] As a further description of the above technical solution: the material of the parts in contact with the material in the water washing tower and water washing system is ordinary carbon steel;

[0012] As a further description of the above technical solution: the alkali washing tower and the water washing tower are one of the following: packed tower, plate tower and sieve plate tower.

[0013] This utility model has the following beneficial effects:

[0014] In this invention, by removing trace amounts of phosphoric acid from the reaction products, on the one hand, it can avoid the frequent replacement of high-cost high-grade material pipe fittings, valves and equipment due to phosphoric acid corrosion, thereby saving a lot of equipment purchase and maintenance costs; on the other hand, equipment with lower material requirements can operate more stably, reduce downtime caused by equipment failure, and improve the overall operating efficiency and production benefits of the equipment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the process flow of an olefin oligomerization acid washing tower proposed in this utility model.

[0016] Legend:

[0017] 1. Alkali washing tower; 2. Alkali washing tower top condenser; 3. Alkali washing tower bottom alkali circulation pump; 4. Water washing tower; 5. Water washing tower top condenser; 6. Water washing tower bottom water circulation pump; 7. Connecting pipe one; 8. Circulating return pipe one; 9. Circulating outlet pipe one; 10. Connecting pipe; 11. Connecting pipe two; 12. Circulating return pipe two; 13. Circulating outlet pipe two. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Reference Figure 1 One embodiment of this utility model is an olefin oligomerization acid washing tower, characterized in that it comprises:

[0020] The alkaline washing system is used to further alkaline wash the substances that have been acid-washed in the olefin oligomer acid washing tower to remove residual acid impurities and other harmful substances. The alkaline washing system includes an alkaline washing tower 1, the bottom liquid outlet 1 and the top gas outlet 1 of the alkaline washing tower 1 are connected by a connecting pipe 7. An alkaline washing tower top condenser 2 is installed at the top gas outlet 1. The gas phase output from the gas outlet 1 becomes a cryogenic liquid after passing through the condenser, and is then sent to the water washing tower after being pressurized and mixed.

[0021] The water washing system is used to wash the substances in the olefin oligomer acid washing tower that have undergone acid washing and alkali washing to further remove residual acid, alkali and other impurities. The water washing system includes a water washing tower 4, the bottom liquid outlet 2 and the top gas outlet 2 of the water washing tower 4 are connected by a connecting pipe 2 11, and a water washing tower top condenser 5 is installed on the connecting pipe 2 11. The connecting pipe 1 7 is connected to the liquid inlet of the water washing tower 4 through a connecting pipe 10. The cryogenic liquid alkali washing system also includes an alkali solution circulation pump 3 at the bottom of the alkali washing tower, and the input end of the alkali solution circulation pump 3 is connected to the circulation outlet pipe 1 9. The alkaline washing tower 1 is connected to the outlet of the alkaline washing tower 1. The output end of the alkaline washing tower bottom alkaline circulation pump 3 is connected to one side of the alkaline washing tower 1 through the circulation return pipe 1 8. The water washing system also includes a water washing tower bottom water circulation pump 6. The input end of the water washing tower bottom water circulation pump 6 is connected to the outlet of the water washing tower 4 through the circulation outlet pipe 2 13. The output end of the water washing tower bottom water circulation pump 6 is connected to one side of the water washing tower 4 through the circulation return pipe 2 12. The water washing tower 4 and the parts in contact with the materials in the water washing system are made of ordinary carbon steel. The alkaline washing tower 1 and the water washing tower 4 are one of the following: packed tower, plate tower and sieve plate tower.

[0022] First, the raw material is an olefin oligomer containing trace amounts of phosphoric acid. This oligomer is washed in an alkaline washing tower to remove the phosphoric acid, and then washed in a water washing tower to remove the alkaline solution. The olefin oligomerization includes propylene oligomerization and butene oligomerization. The catalyst system is a solid phosphoric acid catalyst. The oligomer contains trace amounts of phosphoric acid. The olefin oligomer containing trace amounts of phosphoric acid enters alkaline washing tower 1. The gaseous component liquefies from bottom to top through the alkaline washing tower top condenser 2 and merges with the oil phase from the bottom of the tower before going to water washing tower 4. The alkali liquid at the bottom of alkaline washing tower 1 is circulated back to the top of alkaline washing tower 1 via the bottom alkaline washing tower circulation pump 3. Due to the different densities of the alkali solution and the oil phase, they will gradually separate into layers under static conditions due to gravity. Usually, the density of the oil phase is less than that of the alkali solution, so the oil phase floats on top of the alkali solution. Fresh alkali solution is replenished into the alkaline washing tower 1 system through the inlet of the bottom alkaline washing tower circulation pump 3. The oil phase from alkaline washing tower 1 enters water washing tower 4, where the alkali solution interacts with the oil phase, such as emulsification and dissolution. During this process, a portion of the oil phase may form a relatively lighter and purer oil phase component, namely the clear oil group. The clear oil group is liquefied and cooled from bottom to top through the top of the water washing tower 4 by the top condenser 5. The water spray can provide a certain flow force to the liquid in the tower, promoting the upward movement of the clear oil group, which then merges with the oil phase from the bottom of the water washing tower 4 to separate the olefin oligomerization products. The deionized water from the bottom of the water washing tower 4 is circulated back to the top of the water washing tower 4 via the bottom water washing tower circulation pump 6. The deionized water is replenished into the water washing tower 4 system from the inlet of the bottom water washing tower circulation pump 6. The olefin oligomerization products containing trace amounts of phosphoric acid, after alkaline washing and water washing, have a material pH of ~7, removing trace amounts of phosphoric acid from the reaction products. On the one hand, this can avoid frequent replacement of high-cost high-grade pipe fittings, valves and equipment due to phosphoric acid corrosion, thereby saving a lot of equipment purchase and maintenance costs. On the other hand, equipment with lower material requirements can operate more stably, reducing downtime caused by equipment failure and improving the overall operating efficiency and production benefits of the unit.

[0023] Working principle: First, the raw material is an olefin oligomer containing trace amounts of phosphoric acid. It is washed in an alkaline washing tower to remove the phosphoric acid, and then washed in a water washing tower to remove the alkaline solution. The olefin oligomer includes propylene oligomer and butene oligomer. The catalyst system is a solid phosphoric acid catalyst. The oligomer contains trace amounts of phosphoric acid. The olefin oligomer containing trace amounts of phosphoric acid enters the alkaline washing tower 1. The gas phase component is liquefied from bottom to top through the alkaline washing tower top condenser 2 and then merged with the oil phase from the bottom of the tower before going to the water washing tower 4. The alkali liquid at the bottom of the alkaline washing tower 1 is circulated back to the top of the alkaline washing tower 1 through the bottom alkaline washing tower bottom alkali circulation pump 3. Due to the different densities of the alkali liquid and the oil phase, they will gradually separate into layers under the action of gravity in a static state. Normally, the density of the oil phase is less than that of the alkali solution, so the oil phase will float on top of the alkali solution. Fresh alkali solution is replenished into the alkali washing tower 1 system from the inlet of the alkali solution circulation pump 3 at the bottom of the alkali washing tower. The oil phase from the alkali washing tower 1 enters the water washing tower 4. The alkali solution will interact with the oil phase to a certain extent, such as emulsification and dissolution. During this process, a portion of the oil phase may form a relatively lighter and purer oil phase component, namely the clear oil group. The clear oil group is liquefied and cooled from bottom to top through the top of the water washing tower 4 by the top condenser 5. The water spray can provide a certain flow force to the liquid in the tower, promoting the upward movement of the clear oil group, which then merges with the oil phase from the bottom of the water washing tower 4 to separate the olefin oligomerization products. The deionized water from the bottom of the water washing tower 4 is circulated back to the top of the water washing tower 4 via the bottom water washing tower circulation pump 6. The deionized water is replenished into the water washing tower 4 system from the inlet of the bottom water washing tower circulation pump 6. The olefin oligomerization products containing trace amounts of phosphoric acid, after alkaline washing and water washing, have a material pH of ~7, removing trace amounts of phosphoric acid from the reaction products. On the one hand, this can avoid frequent replacement of high-cost high-grade pipe fittings, valves and equipment due to phosphoric acid corrosion, thereby saving a lot of equipment purchase and maintenance costs. On the other hand, equipment with lower material requirements can operate more stably, reducing downtime caused by equipment failure and improving the overall operating efficiency and production benefits of the unit.

[0024] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An olefin oligomerization acid washing tower, characterized in that, include: Alkaline washing system is used to further alkaline wash the substances that have been acid-washed in the olefin oligomer acid washing tower to remove residual acid impurities and other harmful substances. The alkaline washing system includes an alkaline washing tower (1). The bottom liquid outlet and the top gas outlet of the alkaline washing tower (1) are connected by a connecting pipe (7). An alkaline washing tower top condenser (2) is provided at the top gas outlet of the alkaline washing tower (1). The water washing system is used to perform water washing operations on the substances in the olefin oligomer acid washing tower that have undergone acid washing and alkali washing treatment, so as to further remove residual acid, alkali and other impurities. The water washing system includes a water washing tower (4). The bottom liquid outlet 2 and the top gas outlet 2 of the water washing tower (4) are connected by a connecting pipe 2 (11). A water washing tower top condenser (5) is installed on the connecting pipe 2 (11). The connecting pipe 1 (7) is connected to the liquid inlet of the water washing tower (4) through a connecting pipe (10). The alkaline washing system also includes an alkaline liquid circulation pump (3) at the bottom of the alkaline washing tower. The input end of the alkaline liquid circulation pump (3) at the bottom of the alkaline washing tower is connected to the outlet of the alkaline washing tower (1) through a circulation outlet pipe (9). The output end of the alkaline liquid circulation pump (3) at the bottom of the alkaline washing tower is connected to one side of the alkaline washing tower (1) through a circulation return pipe (8). The water washing system also includes a water washing tower bottom water circulation pump (6). The input end of the water washing tower bottom water circulation pump (6) is connected to the outlet of the water washing tower (4) through the second circulation outlet pipe (13). The output end of the water washing tower bottom water circulation pump (6) is connected to one side of the water washing tower (4) through the second circulation return pipe (12). The washing tower (4) and the parts in the washing system that come into contact with the materials are made of ordinary carbon steel; The alkaline washing tower (1) and the water washing tower (4) are one of the following: packed tower, plate tower and sieve plate tower.

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