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Process for synthesizing sodium nitrophenolate by continuously hydrolyzing nitrochlorobenzene

A technology of nitrochlorobenzene and sodium nitrophenolate, which is applied in the field of continuous hydrolysis of nitrochlorobenzene to synthesize sodium nitrophenolate, which can solve the problem of uneven quality of the output from the reactor, difficulty in automatic operation, and small scale of traditional processes and other issues, to achieve the effect of high conversion rate, reduced production cost and high safety factor

Pending Publication Date: 2020-08-07
南京简迪环境工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional process adopts intermittent operation, and it is not easy to realize full automatic operation; the quality of each reactor in the traditional process operation is uneven; the traditional process is small in scale and high in cost

Method used

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  • Process for synthesizing sodium nitrophenolate by continuously hydrolyzing nitrochlorobenzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step 1: Preheat 6% liquid caustic soda to 110°C, pump it and nitrochlorobenzene into hydrolysis kettle A respectively with a metering pump, and stir. The molar ratio of nitrochlorobenzene and liquid caustic soda is controlled at 1:2 to ensure that the nitrochlorobenzene The conversion of base chlorobenzene is complete;

[0033] Step 2: Heat the hydrolysis kettle A, and the temperature rises to 150°C. Since the reaction is an exothermic reaction, after overtemperature and overpressure, there is an exhaust pipeline, a safety valve and a high-pressure cooling water pipe to remove excess heat from the hydrolysis kettle A, so that The temperature in the hydrolysis tank A is kept constant at 15°C, and the pressure is controlled at 0.5-0.85Mpa;

[0034] Step 3: When the hydrolysis kettle A is almost full, preheat the temperature of the hydrolysis kettle B to 150°C and feed the material to the hydrolysis kettle B. When the feed liquid contacts the stirring paddle in the hydroly...

Embodiment 2

[0039] Embodiment two: step one: 10% liquid caustic soda is preheated to 120 ℃, and nitrochlorobenzene is pumped into the hydrolysis kettle A respectively with a metering pump, and stirred, and the molar ratio of nitrochlorobenzene and liquid caustic soda is controlled at 1: 3. Ensure that the conversion of nitrochlorobenzene is complete;

[0040] Step 2: Heat the hydrolysis kettle A, and the temperature rises to 160°C. Since the reaction is an exothermic reaction, after overtemperature and overpressure, there is an exhaust pipeline, a safety valve and a high-pressure cooling water pipe to remove excess heat from the hydrolysis kettle A, so that The temperature in the hydrolysis tank A is kept constant at 160°C, and the pressure is controlled at 0.5-0.85Mpa;

[0041] Step 3: When the hydrolysis kettle A is almost full, preheat the temperature of the hydrolysis kettle B to 160°C and feed the material to the hydrolysis kettle B. When the feed liquid contacts the stirring paddle ...

Embodiment 3

[0047] Step 1: Preheat 15% liquid caustic soda to 130°C, pump it and nitrochlorobenzene into hydrolysis kettle A respectively with a metering pump, and stir. The molar ratio of nitrochlorobenzene and liquid caustic soda is controlled at 1:5 to ensure that the nitrochlorobenzene The conversion of base chlorobenzene is complete;

[0048] Step 2: Heat the hydrolysis kettle A, and the temperature rises to 180°C. Since the reaction is an exothermic reaction, after overtemperature and overpressure, there is an exhaust pipeline, a safety valve and a high-pressure cooling water pipe to remove excess heat from the hydrolysis kettle A, so that The temperature in the hydrolysis tank A is kept constant at 175°C, and the pressure is controlled at 0.5-0.85Mpa;

[0049] Step 3: When the hydrolysis kettle A is almost full, preheat the temperature of the hydrolysis kettle B to 180°C and feed the material to the hydrolysis kettle B. When the feed liquid contacts the stirring paddle in the hydro...

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Abstract

The invention relates to a process for synthesizing sodium nitrophenolate by continuous hydrolysis of nitrochlorobenzene. Synthesis equipment for implementing the synthesis process comprises a hydrolysis kettle A, a hydrolysis kettle B, a hydrolysis kettle C, a hydrolysis kettle D, a flash evaporation kettle, a crystallization kettle A, a crystallization kettle B, a crystallization kettle C and acentrifugal machine. The synthesis process comprises the following steps: completely reacting liquid caustic soda and nitrochlorobenzene in the four hydrolysis kettles, feeding the obtained material into the flash tank, feeding a gas phase in the flash tank into a heat exchanger to preheat a raw material dilute alkali, controlling the temperature of the liquid phase to be 110-130 DEG C, feeding the liquid phase into a cooling third-stage crystallization kettle, and cooling for crystallization; and finally, obtaining sodium nitrophenolate through the centrifugal machine. Nitrochlorobenzene andliquid caustic soda are simultaneously fed, reactants are fully mixed by connecting the four kettles in series and feeding from top to bottom, the reaction time is long enough, and the reactants are finally extracted from the bottom of the last kettle, so compared with the traditional process, the process of the invention has the advantages of high conversion rate, good stability, simplicity in operation, high safety coefficient and the like.

Description

technical field [0001] The invention relates to the field of continuous hydrolysis synthesis of nitrochlorobenzene, in particular to a process for synthesizing sodium nitrophenolate by continuous hydrolysis of nitrochlorobenzene. Background technique [0002] The traditional process adopts intermittent operation, and it is difficult to realize full automatic operation; the quality of the output of each reactor in the traditional process operation is not uniform; the traditional process is small in scale and high in cost. Contents of the invention [0003] In order to solve the above technical problems and other problems, the present invention provides a process for the continuous hydrolysis of nitrochlorobenzene to synthesize sodium nitrophenolate. [0004] In order to solve the above-mentioned technical problems, the technical scheme provided by the present invention is: nitrochlorobenzene continuous hydrolysis synthesis process of sodium nitrophenolate, which comprises s...

Claims

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Application Information

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IPC IPC(8): C07C201/12C07C201/16C07C205/22
CPCC07C201/12C07C201/16C07C205/22
Inventor 赵杰王顺明高强
Owner 南京简迪环境工程有限公司
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