一种乙烯-乙烯醇共聚聚合釜

Abstract

本实用新型提供了一种乙烯‑乙烯醇共聚聚合釜，釜体内设置换热装置，所述换热装置包括：所述回水缓冲区与上水缓冲区，彼此独立并均与釜内空间相隔离、位于釜内反应液液面之上，用于集中接收与外排调温水；换热管束，多组环绕搅拌轴中轴线沿圆周方向等距间隔分布的套管组成一圈换热管束，多圈换热管束沿搅拌轴的径向等距间隔分布，处于釜内强搅拌区域；每组套管中，上水流道向上连通至上水缓冲区，向下与折流区相通，回水流道向上连通至回水缓冲区，向下与折流区相通，上水缓冲区内的调温水流经上水流道，经折流区折流后经回水流道回流至回水缓冲区。本实用新型能够消除搅拌死角，能有效防止团聚树脂的形成，便于调控聚合反应。

Claims

1. An ethylene-vinyl alcohol copolymerization reactor, comprising a reactor body, a head, and a stirring device, wherein the reactor body is equipped with a jacket, and temperature-regulating water for adjusting the temperature of the polymerization reaction solution is circulated within the jacket, characterized in that, A heat exchange device is installed inside the vessel, the heat exchange device comprising: The water inlet buffer zone is used to centrally receive externally input temperature-controlled water; The return water buffer, located below the upper water buffer, is used to collect the temperature-regulating water after heat exchange and output it to the outside. The return water buffer and the upper water buffer are independent of each other and isolated from the internal space of the reactor, and are located above the surface of the reaction liquid inside the reactor. At least one ring of heat exchange tubes is formed by multiple sets of sleeves equidistantly distributed around the central axis of the stirring shaft in the circumferential direction. The multiple rings of heat exchange tubes are equidistantly distributed radially along the stirring shaft and are located in the strong stirring zone inside the vessel. Each set of sleeves forms a return water channel with an annular cross-section, a columnar upper water channel coaxially placed in the center of the return water channel, and a baffle zone connecting the bottom of the upper water channel and the return water channel. The upper water channel connects upward to the upper water buffer zone and downward to the baffle zone. The return water channel connects upward to the return water buffer zone and downward to the baffle zone. The temperature-regulating water in the upper water buffer zone flows through the upper water channel, is deflected by the baffle zone, and then flows back to the return water buffer zone through the return water channel. The temperature-regulating water in the part of the return water channel below the surface of the reaction liquid exchanges heat with the reaction liquid, and the temperature-regulating water in the entire return water channel exchanges heat with the temperature-regulating water in the upper water channel.

2. The ethylene-vinyl alcohol copolymerization kettle according to claim 1, characterized by: The casing includes an outer heat exchange tube and an inner heat exchange tube coaxially sleeved within the outer heat exchange tube. The upper opening of the outer heat exchange tube is open, and the lower opening is a blind end. The upper and lower openings of the inner heat exchange tube are open, and a vertical gap is left between the lower opening and the bottom of the outer heat exchange tube as a flow deflection zone. A radial gap is left between the outer tube wall and the inner tube wall of the outer heat exchange tube to form the return water flow channel. The inside of the tube serves as the upper water flow channel. The inner heat exchange tube extends upward to above the outer heat exchange tube and is connected to the upper water buffer zone. The outer heat exchange tube extends upward to the upper opening and is connected to the return water buffer zone.

3. The ethylene-vinyl alcohol copolymerization kettle according to claim 1, characterized by: The strong stirring zone refers to the area where each heat exchange tube bundle surrounds the stirring paddle, extending radially outward from the tip of the stirring paddle blade within a range of 0.3-0.5 times the paddle diameter, and extending vertically from the surface of the reaction liquid to the bottom of the vessel, with a gap between the tube bundle and the bottom of the vessel.

4. The ethylene-vinyl alcohol copolymerization kettle according to claim 1, characterized by: The buffer shell assembly and the inner wall of the upper end of the vessel body together form the water inlet buffer zone and the water return buffer zone. The buffer shell assembly includes a frustum-shaped conical shell that is larger at the top and smaller at the bottom, and a cylindrical shell that is coaxially connected to the lower end of the conical shell with the same diameter as the small end of the conical shell. The bottom end and the middle part of the outer peripheral wall of the cylindrical shell are respectively provided with a ring of tube plates that extend horizontally outward in a radial direction. The outer edge of the large end of the conical shell and the two tube plates are connected to the inner wall of the upper end of the vessel body. The water inlet buffer zone and the water return buffer zone are formed by the outer wall of the conical shell, the outer wall of the cylindrical shell, the two tube plates and the inner wall of the vessel body.

5. The ethylene-vinyl alcohol copolymerization kettle according to claim 1, characterized by: Each heat exchange tube bundle is provided with twelve sets of sleeves. The sleeves of two adjacent heat exchange tube bundles are radially aligned and distributed along the stirring shaft. Each pair of radially aligned sleeves are detachably assembled together by multiple sets of fixing parts distributed vertically.

6. The ethylene-vinyl alcohol copolymerization kettle according to claim 5, characterized by: The fasteners include a support plate, U-bolts, and nuts. Each set of sleeves is fastened and clamped between the support plate and the U-bolts by U-bolts and nuts.

7. The ethylene-vinyl alcohol copolymerization kettle according to claim 1, characterized by: The mixing device includes a stirrer and a drive device for driving the stirrer to rotate. The stirrer is a tuning fork paddle stirrer.

8. The ethylene-vinyl alcohol copolymer kettle of claim 1, wherein: The jacket discharges water through a jacket water outlet on the upper part of the jacket and takes in water through a jacket water inlet on the bottom part of the jacket.

9. The ethylene-vinyl alcohol copolymer kettle of claim 1, wherein: The temperature-adjusted water input into the upper water buffer zone and the temperature-adjusted water input into the jacket have a temperature of 25-45℃, and the liquid temperature of the reaction liquid is 55±0.5℃.

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