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Device and process for continuously producing dichloropinacolin through differential circulation

A dichloropinazone and differential technology is applied in the field of devices for continuous production of dichloropinazone by differential circulation, which can solve the problems of large equipment investment, high consumption of raw materials, long production cycle and the like, and achieves increased residence time and production efficiency. High, avoid pollution effect

Pending Publication Date: 2019-06-21
杭州众立化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The production method is a batch production process, which is simple and convenient in process and flexible in operation, but consumes high raw materials, has a long production cycle, requires large investment in equipment (many reactors), high cost, and serious pollution

Method used

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  • Device and process for continuously producing dichloropinacolin through differential circulation
  • Device and process for continuously producing dichloropinacolin through differential circulation
  • Device and process for continuously producing dichloropinacolin through differential circulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Step 1: The chlorinated liquid in the separator 3 reacts chemically with the chlorine gas fed into the chlorine inlet 305 of the separator, and is discharged from the outlet 302 of the separator and pressurized by a circulation pump and enters the gas from the liquid inlet 111 of the main reactor. The liquid mixing chamber 108 is fully mixed with the chlorine gas fed into the gas inlet 110 of the main reactor under the action of the high-efficiency mixing structure 109, and the mixed liquid enters the tube side 105 of the main reactor for chemical reaction, and one route of chlorine gas flows from the main reactor The chlorine gas inlet 107 enters into the gas distributor 101 and disperses evenly, then chemically reacts with the mixed liquid in the tube side 105 of the main reactor (the reaction temperature is 35°C, and the reaction pressure is 80KPa), and at the same time passes through the cooling gas in the shell side 102 of the main reactor. Water cooling, the reacte...

Embodiment 2

[0057] Step 1: The chlorinated liquid in the separator 3 reacts chemically with the chlorine gas fed into the chlorine inlet 305 of the separator, and is discharged from the outlet 302 of the separator and pressurized by a circulation pump and enters the gas from the liquid inlet 111 of the main reactor. The liquid mixing chamber 108 is fully mixed with the chlorine gas fed into the gas inlet 110 of the main reactor under the action of the high-efficiency mixing structure 109, and the mixed liquid enters the tube side 105 of the main reactor for chemical reaction, and one route of chlorine gas flows from the main reactor The chlorine gas inlet 107 enters into the gas distributor 101 and disperses evenly, then chemically reacts with the mixed liquid in the tube side 105 of the main reactor (the reaction temperature is 75°C, and the reaction pressure is 250KPa), and at the same time passes through the cooling gas in the shell side 102 of the main reactor. Water cooling, the react...

Embodiment 3

[0064] Step 1: The chlorinated liquid in the separator 3 reacts chemically with the chlorine gas fed into the chlorine inlet 305 of the separator, and is discharged from the outlet 302 of the separator and pressurized by a circulation pump and enters the gas from the liquid inlet 111 of the main reactor. The liquid mixing chamber 108 is fully mixed with the chlorine gas fed into the gas inlet 110 of the main reactor under the action of the high-efficiency mixing structure 109, and the mixed liquid enters the tube side 105 of the main reactor for chemical reaction, and one route of chlorine gas flows from the main reactor The chlorine gas inlet 107 enters into the gas distributor 101 and disperses evenly, then chemically reacts with the mixed liquid in the tube side 105 of the main reactor (the reaction temperature is 55°C, and the reaction pressure is 165KPa), and at the same time passes through the cooling gas in the shell side 102 of the main reactor. Water cooling, the react...

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Abstract

The invention provides a device and a process for continuously producing dichloropinacolin through differential circulation. The device comprises a main reactor, a pre-reactor, a separator, a circulating pump, a discharging pump, a pipeline and an auto-control instrument; each of the main reactor and the pre-reactor is a pipeline type micro-channel reaction heat exchanger, and is provided with multiple longitudinal tube passes and multiple transverse shell passes; the shell passes are used for cooling, and the tube passes are used for conveying a material; the production of the trichloropinacolin is reduced through the differential circulation technology, the product yield is improved, free chlorine in hydrogen chloride of the tail gas reacts with newly added pinacolin by utilizing the pre-reactor so as to remove the free chlorine, the side effect problem of sodium hypochlorite caused by using an alkali wash method is avoided, the reacted chlorination liquid realizes the efficient separation of the dichloropinacolin and the hydrogen chloride dissolved in the chlorination liquid by adopting a vacuum dehydrochlorination technology, and an environmental protection problem of the wastehydrochloric acid production caused by adding water to remove hydrogen chloride in the traditional intermittent method is substituted.

Description

technical field [0001] The invention relates to the field of fine chemical industry, in particular to a device and a process for continuously producing dichloropinatone by differential circulation. Background technique [0002] Dichloropinatone is an important raw material and intermediate in organic synthesis. It can be widely used in pesticides and pharmaceutical intermediates, and was also used in the preparation of triadimefon fungicides in the past. [0003] The synthesis method of dichloropinatone is prepared by chlorination of pinatone with chlorine. [0004] Process principle: [0005] [0006] The measured amount of chlorpinatone is added to the chlorination reaction kettle, and the chlorine gas is heated to 40°C. The chlorine gas is passed into the chlorination reaction kettle through the buffer tank, and is kept at this temperature for 70 hours. At the same time, the tail gas absorption device is turned on, the associated hydrogen chloride is absorbed into h...

Claims

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Application Information

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IPC IPC(8): C07C45/63C07C49/16
Inventor 邱振中汪美贞汪振华
Owner 杭州众立化工科技有限公司
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