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CN-122006632-A - Oxadiazon herbicide production is with esterifying cauldron

CN122006632ACN 122006632 ACN122006632 ACN 122006632ACN-122006632-A

Abstract

The invention discloses an esterification kettle for oxadiazon herbicide production, and belongs to the field of reaction kettle devices. The esterification kettle comprises a lower kettle body, wherein a cooling jacket is arranged on the outer surface of the lower kettle body, an annular cooling cavity with a cooling coil is formed inside the cooling jacket and the lower kettle body, a water inlet pipe and a water outlet pipe are respectively communicated with the bottom and the top of the cooling jacket, a water inlet joint and a water outlet joint are respectively communicated with the top and the bottom of the cooling coil, the water inlet pipe and the water outlet pipe are respectively communicated with an outlet end and an inlet end of a circulating oil supply mechanism, and the water inlet joint is communicated with a cooling water supply mechanism. According to the invention, the heat conduction oil circulation system and the independent cooling coil are integrated in the annular cooling cavity at the outer side of the lower kettle body, the heat conduction oil is responsible for removing basic heat stably in a large area, the built-in cooling coil can provide stronger and quicker local cooling capacity, and the cooling coil is utilized to improve the cooling effect on the top of the reaction system when the phosphorus oxychloride and dichlorophenol are subjected to instantaneous temperature rise caused by severe heat release.

Inventors

  • WANG ZHENGQIANG
  • CAI ZHANGWEI
  • XIA TIAN
  • Wang Xiashan
  • DONG ZHI

Assignees

  • 安徽广信农化股份有限公司

Dates

Publication Date
20260512
Application Date
20260129

Claims (10)

  1. 1. The esterification kettle for producing oxadiazon herbicide is characterized by comprising a lower kettle body (1) and an upper kettle body (11) which are assembled into a whole; The outer surface of the lower kettle body (1) is provided with a cooling jacket (2), and an annular cooling cavity is formed between the cooling jacket (2) and the lower kettle body (1); A cooling coil pipe (20) is arranged in the annular cooling cavity; The bottom and the top of the cooling jacket (2) are respectively communicated with a water inlet pipe (22) and a water outlet pipe (21); The top and the bottom of the cooling coil pipe (20) are respectively communicated with a water inlet joint (201) and a water outlet joint (202), and the water inlet joint (201) and the water outlet joint (202) respectively penetrate through the top side wall and the bottom side wall of the cooling jacket (2); the water inlet pipe (22) and the water outlet pipe (21) are respectively connected with the outlet end and the inlet end of the circulating oil supply mechanism (40), and the water inlet joint (201) is connected with the cooling water supply mechanism; the device also comprises a controller, and the controller is connected with the cooling water supply mechanism and the circulating oil supply mechanism (40).
  2. 2. The esterification kettle for producing oxadiazon herbicide according to claim 1, wherein the circulating oil supply mechanism (40) comprises an oil storage tank and a circulating pump, a feeding end of the circulating pump is connected with a discharging port of the oil storage tank, the feeding port of the oil storage tank is connected with a water outlet pipe (21) through a first pipeline, and a discharging end of the circulating pump is connected with a water inlet pipe (22) through a second pipeline.
  3. 3. The esterification kettle for producing oxadiazon herbicide as claimed in claim 2, wherein the first pipeline and the second pipeline are respectively sleeved with a heat exchange sleeve, an oil inlet/outlet of the oil storage tank is provided with a first temperature sensor for detecting oil temperature, and the first temperature sensor is connected with the controller.
  4. 4. The esterification kettle for producing oxadiazon herbicide as claimed in claim 3, wherein a second temperature sensor for detecting the upper oil temperature is further arranged at the top of the annular cooling cavity, and the second temperature sensor is connected with the controller.
  5. 5. The esterification kettle for producing oxadiazon herbicide according to claim 1, further comprising an outer jacket (3), wherein the outer jacket (3) is wrapped around the outer side of the cooling jacket (2) and is welded with the outer surface of the lower kettle body (1) in a sealing manner; the cooling jacket (2) is wrapped on the outer surface of the lower kettle body (1) in a surrounding manner and is welded with the outer surface of the lower kettle body (1) into a whole; The inner surface of the lower kettle body (1) is lined with a glass lining layer, the bottom of the lower kettle body (1) is provided with a discharge valve, and the discharge valve is a glass lining diaphragm valve or a ball valve.
  6. 6. The esterification kettle for producing oxadiazon herbicide according to claim 1, wherein a reinforcing sleeve (12) is covered on the outer wall of the upper kettle body (11), and a vacuum isolation cavity is formed between the reinforcing sleeve (12) and the upper kettle body (11); the top of the upper kettle body (11) is provided with a stirring mechanism (4), and the stirring part of the stirring mechanism (4) stretches into the lower kettle body (1); the top of the upper kettle body (11) is provided with a plurality of feeding connectors (13); The device further comprises a third temperature sensor (14) arranged at the top of the upper kettle body (11) and a fourth temperature sensor (15) arranged at the bottom of the lower kettle body (1), wherein the third temperature sensor (14) and the fourth temperature sensor (15) are dial type thermometers.
  7. 7. The esterification kettle for producing oxadiazon herbicide according to claim 1, wherein the top of the upper kettle body (11) is further communicated with a first condensation reflux mechanism (3), the condensation reflux mechanism (3) comprises a shell (30) communicated with the top of the upper kettle body (11) through a reflux pipe (31), and a condensation coil (33) is arranged in the shell (30); An opening (32) is formed in the top of the shell (30); Two ends of the condensing coil (33) are respectively connected with a water inlet pipe (34) and a water outlet pipe (35), and the water inlet pipe (34) and the water outlet pipe (35) respectively penetrate through the top and the bottom of the shell (30).
  8. 8. The esterification kettle for producing oxadiazon herbicide according to claim 7, wherein the opening (32) is connected to an air inlet and outlet mechanism for exhausting air in the casing (30) through the opening (32) and feeding the exhausted air into the casing (30) through the opening (32); The housing (30) is a balloon/piston cartridge for storing gas.
  9. 9. The esterification kettle for producing oxadiazon herbicide according to claim 7, further comprising a second condensation reflux mechanism (5) communicated with the top of the upper kettle body (11), wherein the second condensation reflux mechanism (5) and the first condensation reflux mechanism (3) have the same structure; The device also comprises a pumping mechanism (6) for pumping out the gas in the second condensation reflux mechanism (5) and pressing the gas into the second condensation reflux mechanism (5); The pumping mechanism (6) comprises a piston cylinder (60), a piston (61) sliding along the inner wall of the piston cylinder in a sealing way is arranged in the piston cylinder (60), a piston rod (610) is connected to the piston (61), a through hole is formed in the top of the piston cylinder (60), a ceramic sleeve (601) is arranged at the through hole, and a ceramic layer matched with the ceramic sleeve (601) in a sealing way is arranged on the outer side of the piston rod (610); A second unidirectional structure which only allows gas to be pumped into the pumping mechanism (6) from the second condensation reflux mechanism (5) is arranged between the pumping mechanism (6) and the second condensation reflux mechanism (5); a first unidirectional structure which only allows gas to be pressed into the first condensation reflux mechanism (3) from the pumping mechanism (6) is arranged between the pumping mechanism (6) and the first condensation reflux mechanism (3).
  10. 10. The esterification kettle for producing oxadiazon herbicide as claimed in claim 9, wherein a first air inlet and outlet hole (62) and a second air inlet and outlet hole (64) are formed in the bottom side surface of the piston cylinder (60); The first unidirectional structure and the second unidirectional structure are respectively arranged at a first air inlet and outlet hole (62) and a second air inlet and outlet hole (64); The first unidirectional structure comprises a first pipe body (63), wherein a first bracket (631) is fixed on the inner wall of the first pipe body (63), and one side of the first bracket (631) is connected with a first blocking ball (633) through a first elastic telescopic piece (632); Wherein, second one-way structure includes second body (63), fixed closure plate (644) of second body (63) inner wall, through-hole (645) are seted up at the middle part of closure plate (644), the inner wall of second business turn over gas pocket (64) is fixed second support (641), one side of second support (641) is connected with second stifled ball (643) through second elastic expansion piece (642), and in the natural state, second stifled ball (643) supports and forms the shutoff on through-hole (645).

Description

Oxadiazon herbicide production is with esterifying cauldron Technical Field The invention relates to the field of reaction kettle devices, in particular to an esterification kettle for oxadiazon herbicide production. Background In the production process of oxadiazon herbicide, the esterification reaction is a key step, and the esterification kettle is used as key equipment of the process, and the performance of the esterification kettle directly influences the reaction efficiency, the product purity and the production safety. The prior esterification kettle generally comprises a kettle body, wherein a cooling jacket is arranged on the outer side of the kettle body, a cooling interlayer is formed between the cooling jacket and the kettle body, and heat conduction oil is circularly introduced into the cooling interlayer to finish cooling during operation. In the actual production process, phosphorus oxychloride is added dropwise to dichlorophenol, and then the phosphorus oxychloride and dichlorophenol are contacted and rapidly released to generate high temperature, so that the temperature at the top of a reaction system is rapidly increased, and the top of the reaction system cannot be accurately cooled in a traditional single-layer jacket cooling mode. The top of the reaction system is not cooled timely, side reactions are easy to be caused, the quality of products is influenced, and even safety accidents such as flushing and the like can be caused by heat accumulation. Disclosure of Invention The invention provides an esterification kettle for oxadiazon herbicide production, which can solve the problem that the top of a reaction system cannot be cooled accurately in a single-layer jacket cooling mode in the prior art. The esterification kettle for producing the oxadiazon herbicide comprises a lower kettle body and an upper kettle body which are assembled into a whole, wherein a cooling jacket is arranged on the outer surface of the lower kettle body, an annular cooling cavity is formed between the cooling jacket and the lower kettle body, a cooling coil pipe is arranged in the annular cooling cavity, the bottom and the top of the cooling jacket are respectively communicated with a water inlet pipe and a water outlet pipe, the top and the bottom of the cooling coil pipe are respectively communicated with a water inlet joint and a water outlet joint, the water inlet joint and the water outlet joint respectively penetrate through the top and the bottom side wall of the cooling jacket, the water inlet pipe and the water outlet pipe are respectively communicated with an outlet end and an inlet end of a circulating oil supply mechanism, the water inlet joint is communicated with a cooling water supply mechanism, and the esterification kettle further comprises a controller, wherein the controller is connected with the cooling water supply mechanism and the circulating oil supply mechanism. Further, the circulating oil supply mechanism comprises an oil storage tank and a circulating pump, wherein the feeding end of the circulating pump is communicated with the discharging port of the oil storage tank, the feeding port of the oil storage tank is communicated with the water outlet pipe through a first pipeline, and the discharging end of the circulating pump is communicated with the water inlet pipe through a second pipeline. Further, the first pipeline and the second pipeline are respectively sleeved with a heat exchange sleeve, an oil inlet/outlet of the oil storage tank is provided with a first temperature sensor for detecting oil temperature, and the first temperature sensor is connected with the controller. Further, a second temperature sensor for detecting the temperature of the upper oil layer is further arranged at the top of the annular cooling cavity, and the second temperature sensor is connected with the controller. The glass lining kettle comprises a lower kettle body, a cooling jacket, a glass lining layer, a discharging valve and a glass lining diaphragm valve or a ball valve, wherein the cooling jacket is wrapped on the outer surface of the lower kettle body in a surrounding mode, is welded with the outer surface of the lower kettle body in a sealing mode, is wrapped on the outer surface of the lower kettle body in a surrounding mode, is welded with the outer surface of the lower kettle body in a welding mode, and is lined with the glass lining layer. Further, a reinforcing sleeve is arranged on the outer wall cover of the upper kettle body, a vacuum isolation cavity is formed between the reinforcing sleeve and the upper kettle body, a stirring mechanism is arranged at the top of the upper kettle body, a stirring part of the stirring mechanism stretches into the lower kettle body, a plurality of feeding connectors are arranged at the top of the upper kettle body, the vacuum isolation kettle further comprises a third temperature sensor arranged at the top of the upper kettle body and a fourth temperatu