Ethylene recovery device in methanol-to-olefin system

Abstract

The utility model relates to the technical field of chemical production, and discloses an ethylene recovery device in a methanol-to-olefin system, which comprises an absorption tower, support rods are fixedly connected to the middle parts of the left side and the right side of the lower surface of the absorption tower, and a chassis is fixedly connected to the bottoms of the support rods. A plurality of supporting legs are fixedly connected to the lower surface of the chassis, a stirring mechanism is arranged in the absorption tower, a pretreatment mechanism is arranged above the absorption tower and comprises a threaded groove, and the threaded groove is formed in the upper surface of the absorption tower. Through the threaded groove formed in the upper surface of the absorption tower, the threaded pipe can be screwed in the threaded groove, the fixed cylinder can be in threaded connection with the absorption tower through the threaded pipe at the bottom, and the upper surface of the filter disc is used for placing a drying agent to filter raw materials entering the absorption tower; therefore, the effect of effectively capturing and utilizing ethylene resources generated in the methanol reaction process can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical production, in particular to an ethylene recovery device in a methanol to olefins system. Background Art

[0002] Ethylene and propylene are the two most widely produced and consumed basic chemicals in the world. In recent years, with the increasing depletion of oil resources, the MTO technology that uses coal or natural gas as raw materials to produce ethylene and propylene via methanol or dimethyl ether has received widespread attention. For coal-to-olefins companies, due to the influence of the external environment and changes in the olefin market, the price of raw material coal has risen, and the prices of polyethylene and polypropylene have changed significantly. It is very important to improve the company's own risk resistance by reducing costs and increasing efficiency. By studying the factors affecting the yield of DMTO units, increasing the output of dienes (ethylene + propylene), and improving the economic benefits of the company.

[0003] With the rapid development of the economy, the demand for petrochemical products is growing. Methanol to olefins technology, as an important chemical production method, can effectively convert methanol into high-value olefin products such as ethylene and propylene. However, during the MTO reaction process, due to the existence of side reactions, a certain amount of unreacted methanol and other light hydrocarbon mixtures will be generated, including valuable ethylene resources. If these substances are directly discharged or not effectively utilized, it will not only cause resource waste, but also increase production costs and may have adverse effects on the environment. Utility Model Content

[0004] (1) Technical problems solved

[0005] In response to the shortcomings of the existing technology, the utility model provides an ethylene recovery device in a methanol to olefins system, which has the advantages of effectively capturing and utilizing the ethylene resources generated during the methanol reaction process, and solves the problems mentioned in the above background technology.

[0006] (2) Technical solution

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an ethylene recovery device in a methanol to olefins system, comprising an absorption tower, wherein support rods are fixedly connected to the middle parts of the left and right sides of the lower surface of the absorption tower, the bottoms of the support rods are fixedly connected to a chassis, and a number of support legs are fixedly connected to the lower surface of the chassis, a stirring mechanism is provided inside the absorption tower, a pretreatment mechanism is provided above the absorption tower, the pretreatment mechanism includes a threaded groove, the threaded groove is opened on the upper surface of the absorption tower, a threaded pipe is provided above the threaded groove, a fixed cylinder is fixedly connected to the upper surface of the threaded pipe, a filter disc is fixedly connected to the lower part of the inner wall of the fixed cylinder, and a feed pipe is fixedly connected to the middle part of the upper surface of the fixed cylinder.

[0008] Preferably, a connecting pipe is fixedly connected to the lower middle portion of the right side of the absorption tower, and a decomposition tower is fixedly connected to the right side of the connecting pipe.

[0009] Preferably, an air outlet pipe is fixedly connected to the middle of the upper surface of the analytical tower.

[0010] The connecting pipe is connected between the absorption tower and the desorption tower. The interior of the desorption tower is used to reduce the solubility of the solvent to ethylene, so that ethylene is released from the solvent. The decomposed ethylene gas is discharged through the outlet pipe.

[0011] Preferably, a number of heating tubes are fixedly connected to the outer surface of the analytical tower.

[0012] Preferably, a placement plate is fixedly connected to the middle right side of the upper surface of the analytical tower.

[0013] Preferably, a vacuum pump is fixedly mounted on the upper surface of the placement plate.

[0014] The heating tube heats the desorption tower, and the upper surface of the placement plate is used to install a vacuum pump, which is used to evacuate the desorption tower, reduce the pressure inside the desorption tower, reduce the solubility of the absorbent to ethylene, and desorb ethylene from the solution.

[0015] Preferably, the stirring mechanism includes a motor, and the lower surface of the motor is fixedly mounted on the middle part of the upper surface of the chassis.

[0016] Preferably, a rotating rod is fixedly connected to the top of the motor, and a number of stirring plates are fixedly connected to the outer surface of the rotating rod.

[0017] The motor drives the stirring plate to rotate inside the absorption tower through the rotating rod at the top, stirring the air flow inside the absorption tower, so that the gas and the absorbent are fully mixed and reacted, thereby improving the reaction effect between the raw material and the absorbent.

[0018] Compared with the prior art, the present invention provides an ethylene recovery device in a methanol to olefins system, which has the following beneficial effects:

[0019] 1. The utility model has a threaded groove on the upper surface of the absorption tower, and the threaded pipe can be screwed into the inside of the threaded groove. The fixed cylinder can be threadedly connected to the absorption tower through the threaded pipe at the bottom. The upper surface of the filter disc is used to place a desiccant to filter the raw materials entering the absorption tower, thereby effectively capturing and utilizing the ethylene resources generated during the methanol reaction.

[0020] 2. The utility model heats the desorption tower through the heating pipe connected to the right side of the absorption tower, and the vacuum pump installed on the right side of the upper surface can control the pressure inside the desorption tower, so as to quickly decompose the ethylene gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the front view structure of the utility model;

[0023] Figure 3 This is a schematic diagram of the front cross-sectional structure of the absorption tower of the present invention.

[0024] Among them: 1. Absorption tower; 101. Support rod; 102. Chassis; 103. Support leg; 104. Connecting pipe; 105. Analysis tower; 106. Exhaust pipe; 107. Heating pipe; 108. Placement plate; 109. Vacuum pump; 2. Stirring mechanism; 201. Motor; 202. Rotating rod; 203. Stirring plate; 3. Pretreatment mechanism; 301. Threaded groove; 302. Threaded pipe; 303. Fixed cylinder; 304. Filter plate; 305. Feed pipe. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] See also Figure 1-3, an ethylene recovery device in a methanol to olefins system, comprising an absorption tower 1, wherein support rods 101 are fixedly connected to the middle of the left and right sides of the lower surface of the absorption tower 1, the bottom of the support rods 101 is fixedly connected to a chassis 102, and a plurality of support legs 103 are fixedly connected to the lower surface of the chassis 102, a stirring mechanism 2 is provided inside the absorption tower 1, and a pretreatment mechanism 3 is provided above the absorption tower 1, the pretreatment mechanism 3 comprises a threaded groove 301, the threaded groove 301 is opened on the upper surface of the absorption tower 1, a threaded pipe 302 is provided above the threaded groove 301, a fixed cylinder 303 is fixedly connected to the upper surface of the threaded pipe 302, a filter disc 304 is fixedly connected to the lower inner wall of the fixed cylinder 303, and a feed pipe 3 is fixedly connected to the middle of the upper surface of the fixed cylinder 303. 05. The interior of the absorption tower 1 is filled with a suitable absorbent (ethylene glycol, sulfolane, etc.). Ethylene is captured through the contact between the gas and the absorbent. The support rod 101 is vertically connected between the lower surface of the absorption tower 1 and the upper surface of the chassis 102. The support legs 103 support the chassis 102. The threaded groove 301 is embedded in the upper surface of the absorption tower 1. The threaded tube 302 can be screwed on the upper surface of the threaded groove 301. The fixed cylinder 303 can be threadedly connected to the absorption tower 1 through the threaded tube 302 at the bottom, which is convenient for the operator to disassemble and assemble it. The upper surface of the filter disc 304 is used to store a suitable desiccant to remove moisture, solid particles and other impurities in the raw materials to prevent these impurities from affecting the subsequent absorption and separation processes and ensure the cleanliness of the raw materials.

[0027] Specifically, such as Figure 2 As shown, a connecting pipe 104 is fixedly connected to the lower middle portion of the right side of the absorption tower 1 , a desorption tower 105 is fixedly connected to the right side of the connecting pipe 104 , and an air outlet pipe 106 is fixedly connected to the middle portion of the upper surface of the desorption tower 105 .

[0028] Through the above technical solution, the connecting pipe 104 is connected between the absorption tower 1 and the desorption tower 105. The interior of the desorption tower 105 is used to reduce the solubility of the solvent for ethylene, so that ethylene is released from the solvent, and the decomposed ethylene gas is discharged through the outlet pipe 106.

[0029] Specifically, such as Figure 2 As shown, a number of heating tubes 107 are fixedly connected to the outer surface of the decomposition tower 105, a placement plate 108 is fixedly connected to the middle right side of the upper surface of the decomposition tower 105, and a vacuum pump 109 is fixedly installed on the upper surface of the placement plate 108.

[0030] Through the above technical solution, the heating tube 107 heats the decomposition tower 105, and the upper surface of the placement plate 108 is used to install the vacuum pump 109. The vacuum pump 109 is used to vacuum the decomposition tower 105, reduce the pressure inside the decomposition tower 105, reduce the solubility of the absorbent in ethylene, and decompose ethylene from the solution.

[0031] Specifically, such as Figure 3 As shown, the stirring mechanism 2 includes a motor 201, the lower surface of the motor 201 is fixedly installed on the middle of the upper surface of the chassis 102, the top of the motor 201 is fixedly connected to a rotating rod 202, and the outer surface of the rotating rod 202 is fixedly connected to a number of stirring plates 203.

[0032] Through the above technical solution, the motor 201 drives the stirring plate 203 to rotate inside the absorption tower 1 through the rotating rod 202 at the top, stirring the air flow inside the absorption tower 1, so that the gas and the absorbent are fully mixed and reacted, thereby improving the reaction effect between the raw material and the absorbent.

[0033] During use, the operator places the absorbent inside the absorption tower 1, screws the threaded tube 302 at the bottom of the fixed cylinder 303 into the threaded groove 301 on the upper surface of the absorption tower 1, and then the raw material is introduced into the interior of the absorption tower 1 through the feed pipe 305. The motor 201 drives the stirring plate 203 to move through the rotating rod 202 at the top, driving the raw material and the absorbent to fully react to form an ethylene-rich solution. The solution enters the desorption tower 105 through the connecting pipe 104, and the solubility of the absorbent in ethylene is reduced by the heating tube 107 and the vacuum pump 109, and the ethylene is decomposed from the solution to finally obtain ethylene gas.

[0034] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ethylene recovery device in a methanol to olefins system, comprising an absorption tower (1), characterized in that: The middle parts of the left and right sides of the lower surface of the absorption tower (1) are fixedly connected with support rods (101), the bottom of the support rods (101) is fixedly connected with a chassis (102), and the lower surface of the chassis (102) is fixedly connected with a number of support legs (103). The interior of the absorption tower (1) is provided with a stirring mechanism (2), and the upper part of the absorption tower (1) is provided with a pretreatment mechanism (3), and the pretreatment mechanism (3) comprises a threaded groove (301), the threaded groove (301) is opened on the upper surface of the absorption tower (1), a threaded pipe (302) is provided above the threaded groove (301), the upper surface of the threaded pipe (302) is fixedly connected with a fixed cylinder (303), the lower part of the inner wall of the fixed cylinder (303) is fixedly connected with a filter disc (304), and the middle part of the upper surface of the fixed cylinder (303) is fixedly connected with a feed pipe (305).

2. The ethylene recovery device in a methanol to olefins system according to claim 1, characterized in that: A connecting pipe (104) is fixedly connected to the middle portion of the lower right side of the absorption tower (1), and a decomposition tower (105) is fixedly connected to the right side of the connecting pipe (104).

3. The ethylene recovery device in a methanol to olefins system according to claim 2, characterized in that: An air outlet pipe (106) is fixedly connected to the middle portion of the upper surface of the analytical tower (105).

4. The ethylene recovery device in a methanol to olefins system according to claim 2, characterized in that: A number of heating tubes (107) are fixedly connected to the outer surface of the analytical tower (105).

5. The ethylene recovery device in a methanol to olefins system according to claim 2, characterized in that: A placement plate (108) is fixedly connected to the middle portion of the right side of the upper surface of the analytical tower (105).

6. The ethylene recovery device in a methanol to olefins system according to claim 5, characterized in that: A vacuum pump (109) is fixedly mounted on the upper surface of the placement plate (108).

7. The ethylene recovery device in a methanol to olefins system according to claim 1, characterized in that: The stirring mechanism (2) comprises a motor (201), the lower surface of the motor (201) being fixedly mounted on the middle portion of the upper surface of the chassis (102).

8. The ethylene recovery device in a methanol to olefins system according to claim 7, characterized in that: The top of the motor (201) is fixedly connected to a rotating rod (202), and the outer surface of the rotating rod (202) is fixedly connected to a number of stirring plates (203).

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