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CN-121988059-A - Methyl chloride rectifying tower for treating dimethyl ether and treatment process

CN121988059ACN 121988059 ACN121988059 ACN 121988059ACN-121988059-A

Abstract

The invention discloses a methyl chloride rectifying tower and a treatment process for treating methyl chloride containing dimethyl ether, which belong to the field of rectifying towers and comprise a rotating shaft, wherein the rotating shaft is rotationally connected with a shell, an intermediate ring is fixedly connected to the middle part of the outer side of the rotating shaft, a fixed rod is fixedly connected to the outer side of the rotating shaft, one end of the fixed rod, which is far away from the rotating shaft, is fixedly connected with a circular ring, the bottom of the circular ring is fixedly connected with a spiral plate, and the rotating shaft drives the symmetrical spiral plate to rotate, so that the strong stirring and the circulation disturbance of a water phase at the bottom of a tower are realized, the phenomena of gas-liquid layering, a flow dead zone and local overheating are eliminated, the full dissolution of the dimethyl ether in water is ensured, the uniform and stable system is maintained, the gas-liquid shearing dispersion capability is enhanced, the fluid flow state is improved, the sedimentation and the wall adhesion are avoided, the absorption and rectification coupling efficiency is improved, and the separation precision and the device operation stability of the methyl chloride and the dimethyl ether are improved.

Inventors

  • DAI YILONG
  • Li Pansuo
  • WANG ERLEI
  • HAN ZHANFEI

Assignees

  • 沧州诺尔信新材料有限公司

Dates

Publication Date
20260508
Application Date
20260407

Claims (10)

  1. 1. A chloromethane rectifying tower for treating dimethyl ether is characterized by comprising The device comprises a shell (1), wherein a spraying assembly (2) is fixedly connected to the top of the shell (1), a condensing assembly (3) is fixedly connected to the top of the spraying assembly (2), an exhaust pipe (5) is fixedly connected to the top of the condensing assembly (3), a feeding pipe (4) is fixedly connected to the outer side of the shell (1), a limiting piece (8) is arranged on the inner wall, close to the feeding pipe (4), of the shell (1), and a motor (7) is fixedly connected to the bottom of the shell (1); a stirring assembly (6), wherein the stirring assembly (6) is arranged inside the shell (1); The stirring assembly (6) comprises a rotating shaft (61), the rotating shaft (61) is rotationally connected with the shell (1), the rotating shaft (61) is fixedly connected with the output end of the motor (7), an intermediate ring (64) is fixedly connected to the middle part of the outer side of the rotating shaft (61), a fixing rod (63) is fixedly connected to the outer side of the rotating shaft (61), a circular ring (62) is fixedly connected to one end of the fixing rod (63) away from the rotating shaft (61), spiral plates (69) are fixedly connected to the bottom of the circular ring (62), the number of the spiral plates (69) is multiple, the spiral plates (69) are divided into two groups, and the spiral plates (69) are symmetrically arranged by taking the intermediate ring (64) as the center.
  2. 2. The chloromethane rectifying tower for treating dimethyl ether is characterized in that an annular groove (65) is formed in the outer side edge of the middle ring (64), the annular groove (65) is located in the middle of the outer side of the middle ring (64), arc blocks (66) are fixedly connected to the inner wall of the annular groove (65), the number of the arc blocks (66) is four, two arc blocks (66) are divided into a group, a group of arc blocks (66) are symmetrically arranged up and down, a middle rod (68) is fixedly connected to the inner wall of the middle ring (64), a swivel (67) is fixedly connected to one end, away from the middle ring (64), of the middle rod (68), and the swivel (67) is in rotary connection with a rotary shaft (61).
  3. 3. The chloromethane rectifying tower for treating dimethyl ether is characterized in that the limiting piece (8) comprises an arc plate (81), the arc plate (81) is fixedly connected with the inner wall of the shell (1) close to the feeding pipe (4), a round rod (82) is slidably connected to the middle of the arc plate (81), the round rod (82) penetrates through the arc plate (81), a baffle (85) is fixedly connected to the end of the round rod (82), a sliding block (84) is fixedly connected to one end, far away from the baffle (85), of the round rod (82), a spring (83) is sleeved on the outer side of the round rod (82), and two ends of the spring (83) are fixedly connected with the baffle (85) and the inner wall of the arc plate (81) respectively.
  4. 4. The chloromethane rectifying tower for treating dimethyl ether is characterized in that the spraying assembly (2) comprises a shell (21), a connecting plate (23) is fixedly connected to the inner wall of the shell (21), a plurality of connecting plates (23) are fixedly connected to cylinders (24) at one ends, far away from the shell (21), of the connecting plates (23), the connecting plates (23) are uniformly distributed with the cylinders (24) serving as the center, conical barrels (26) are fixedly connected to the bottoms of the cylinders (24), extension barrels (27) are fixedly connected to the bottoms of the conical barrels (26), limiting plates (28) are fixedly connected to the inner wall of the bottom end of the extension barrels (27), and the limiting plates (28) are uniformly distributed.
  5. 5. A chloromethane rectifying tower for treating dimethyl ether according to claim 4, wherein one end of the limiting plate (28) far away from the extension cylinder (27) is fixedly connected with a positioning ring (29), the positioning ring (29) is rotationally connected with the outer side of the rotating shaft (61), the outer side of the cylinder (24) is fixedly connected with a spring plate (25), the spring plate (25) is positioned at the interval between two adjacent connecting plates (23), the inner part of the shell (21) is fixedly connected with a spray head (22), and the spray head (22) is positioned at the interval between two adjacent connecting plates (23).
  6. 6. The chloromethane rectifying tower for treating dimethyl ether is characterized in that the condensing assembly (3) comprises a barrel (31), the barrel (31) is fixedly connected with the top of a shell (21), a guide plate (32) is fixedly connected to the inner wall of the barrel (31), a square plate (34) is fixedly connected to the inner wall of the barrel (31), a partition plate (33) is fixedly connected to one end, far away from the barrel (31), of the square plate (34), the partition plate (33) is located above the guide plate (32), a pipe body (37) is fixedly connected to an upper opening of the guide plate (32), a water inlet pipe (36) is fixedly connected to the top end of the pipe body (37), and a water outlet pipe (35) is fixedly connected to the bottom end of the pipe body (37).
  7. 7. The chloromethane rectifying tower for treating dimethyl ether is characterized in that round tubes (38) are fixedly connected to the inner wall of a tube body (37), the number of the round tubes (38) is multiple, round plates are arranged in the tube body (37), two round plates are symmetrically arranged at two ends of the round tubes (38), inclined holes (39) are formed in the outer side of the tube body (37), the number of the inclined holes (39) is multiple, the inclined holes (39) are divided into two groups, the inclined holes (39) are symmetrically arranged at two ends of the round tubes (38), the inclined holes (39) are located at intervals between the two round plates, an intermediate plate (310) is fixedly connected to the inner wall of the partition plate (33), and the inner wall of the intermediate plate (310) is fixedly connected with the outer side of the tube body (37).
  8. 8. A process for treating methyl chloride rectifying tower containing dimethyl ether, which is characterized by comprising the following steps: S1, raw material feeding, namely feeding methyl chloride mixed material containing dimethyl ether into a shell (1) through a feeding pipe (4), and elastically buffering the methyl chloride mixed material through a baffle (85), a round rod (82), a spring (83) and a sliding block (84) of a limiting piece (8), so that stable feeding is realized, and the condition that feeding impacts the working condition in a disturbance tower is avoided; S2, stirring at the bottom of the tower, wherein a motor (7) drives a rotating shaft (61) of a stirring assembly (6) to rotate, drives a spiral plate (69) and an intermediate ring (64) to rotate, fully stirs water phase at the bottom of the tower, and simultaneously heats the water phase at the bottom of the tower by a heater to enable dissolved dimethyl ether and chloromethane to be heated and vaporized to form an ascending gas phase; S3, spraying and absorbing, wherein an ascending gas phase is in reverse contact with water flow sprayed by a spray head (22) of the spraying assembly (2), and dimethyl ether in a gas phase is absorbed into water and flows back to the bottom of the tower downwards by utilizing the characteristics that dimethyl ether is easily soluble in water and methyl chloride is difficultly soluble in water, so that preliminary separation of methyl chloride and dimethyl ether is realized; s4, gas phase condensation, namely methyl chloride gas phase with dimethyl ether removed rises to enter a condensation assembly (3), is liquefied after heat exchange and cooling of a guide plate (32), a pipe body (37) and a round pipe (38), part of condensate is used as reflux to maintain rectification, the rest is used as a high-purity methyl chloride product to be collected independently, and noncondensable gas is discharged from an exhaust pipe (5).
  9. 9. The process for treating methyl chloride rectifying tower containing dimethyl ether according to claim 8, wherein in the step S2, a spiral plate (69) performs forced stirring and circulation disturbance on water phase at the bottom of the tower to eliminate gas-liquid layering and flow dead zones, and simultaneously an arc block (66) rotates along with a rotating shaft (61) and periodically contacts and extrudes a sliding block (84) of a limiting piece (8), so that a spring (83) stretches and stretches to drive a round rod (82) and a baffle (85) to move, and self-adaptive adjustment of stirring rotating speed and feeding opening is realized.
  10. 10. The process for treating a chloromethane rectifying tower containing dimethyl ether according to claim 8, wherein in the step S3, dimethyl ether in a gas phase is selectively absorbed into water by utilizing the characteristic that dimethyl ether is easily dissolved in water and chloromethane is difficultly dissolved in water, and an aqueous solution after the absorption of the dimethyl ether flows back to the bottom of the tower to realize efficient separation of the dimethyl ether and the chloromethane, and a spring plate (25) plays a role in buffering and guiding a gas flow and a liquid flow, so that a gas-liquid contact effect and absorption efficiency are improved.

Description

Methyl chloride rectifying tower for treating dimethyl ether and treatment process Technical Field The invention discloses a chloromethane rectifying tower for treating dimethyl ether and a treatment process, and relates to the field of rectifying towers. Background Methyl chloride is used as an important chemical raw material and an organic synthesis intermediate, is widely applied to the chemical production fields of organic silicon, pesticides, medicines, dyes and the like, and is often accompanied with the generation of byproduct dimethyl ether in raw material gas in the preparation and purification processes, and because the boiling point of the methyl chloride and the boiling point of the dimethyl ether are extremely close and the relative volatility is small, a near-boiling or azeotropic system is easy to form, the high-efficiency separation of the methyl chloride and the dimethyl ether is difficult to realize by adopting a conventional rectification process, the problems of insufficient product purity, high separation energy consumption, low recovery rate and the like are easy to occur, and the industrial production requirement of high-purity methyl chloride cannot be met. In the use process of the existing rectifying device, the bottom water phase is easy to generate layering, flowing dead zone and local overheating phenomena due to poor gas-liquid mixing effect at the bottom of the tower, so that the dimethyl ether is not uniformly dissolved, the light component is not fully desorbed, the separation efficiency and the product purity are directly reduced, the buffering and self-adaptive adjusting structure is lacked in the feeding process, the gas-liquid balance state in the tower is easy to damage due to fluctuation and impact of the raw material feeding flow rate, the pressure and temperature working conditions in the tower are unstable, the continuous and stable operation of rectification is influenced, meanwhile, the spraying water distribution at the top of the tower is not uniform, the gas-liquid two-phase contact is insufficient, the contact time is short, the selective absorption effect on the dimethyl ether is limited, and the efficient separation is difficult to realize. Disclosure of Invention The invention aims to solve the problems, and discloses a methyl chloride rectifying tower and a treatment process for treating methyl chloride containing dimethyl ether, wherein the methyl chloride rectifying tower comprises a shell, a spraying assembly is fixedly connected to the top of the shell, a condensing assembly is fixedly connected to the top of the spraying assembly, an exhaust pipe is fixedly connected to the top of the condensing assembly, a feeding pipe is fixedly connected to the outer side of the shell, a limiting piece is arranged on the inner wall of the shell, which is close to the feeding pipe, a motor is fixedly connected to the bottom of the shell, and a heater is arranged at the bottom of the shell; The stirring assembly is arranged in the shell; The stirring assembly comprises a rotating shaft, the rotating shaft is rotationally connected with the shell, the rotating shaft is fixedly connected with the output end of the motor, a middle ring is fixedly connected with the middle part of the outer side of the rotating shaft, the rotating shaft drives the symmetrical spiral plates to rotate, the water phase at the bottom of the tower can be subjected to strong stirring and circulation disturbance, the phenomena of gas-liquid layering, flowing dead zone and local overheating are eliminated, the dimethyl ether is ensured to be fully dissolved in the water and to keep a system uniformly stable, meanwhile, the gas-liquid shearing dispersion capacity is enhanced, the fluid flowing state is improved, the sedimentation and sticking wall are avoided, the absorption and rectification coupling efficiency is improved, the separation precision and the device operation stability of chloromethane and the dimethyl ether are improved, a fixing rod is fixedly connected with the outer side of the rotating shaft, one end of the fixing rod, far away from the rotating shaft, of the circular ring is fixedly connected with spiral plates, the number of the spiral plates is multiple, the spiral plates are divided into two groups, and the two groups of spiral plates are symmetrically arranged by taking the middle ring as the center. Further, the annular groove is formed in the outer side edge of the middle ring, the annular groove is located in the middle of the outer side of the middle ring, the arc blocks are fixedly connected to the inner wall of the annular groove, the number of the arc blocks is four, two arc blocks are divided into a group, a group of arc blocks are arranged symmetrically up and down, the middle rod is fixedly connected to the inner wall of the middle ring, one end of the middle rod, far away from the middle ring, is fixedly connected with the rotating ring, and the rotating ring i