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Nitrotoluene washing device and method

A technology of nitrotoluene and washing equipment, which is applied in the field of refinement, can solve the problems of large primary water consumption, difficult biochemical treatment, and difficult to pass the washing, so as to reduce the amount of waste water produced, reduce the amount of treated waste water, and achieve good washing effect Effect

Inactive Publication Date: 2013-09-18
JIANGSU HUAIHE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The domestic traditional nitrotoluene tank-type series countercurrent washing process uses primary water for mixed washing, and the washing tank and separator are separated, so it is impossible to circulate the washing tank to realize the adjustment of the ratio between the aqueous phase and the organic phase, not only the primary water The consumption is large, the washing is difficult to pass, and a large amount of phenolic wastewater is produced, which is extremely difficult to biochemically treat

Method used

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  • Nitrotoluene washing device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] like figure 1 As shown, 100 parts of crude nitrotoluene A, 60 parts of fresh water C, 10% of the flash water B evaporated from the waste water, and all the flash water D are continuously added to the washing device and adjusted by the internal water circulation valve to make the washing kettle ( 2, 4, 6, 8) The volume ratio of the washing water to the crude nitrotoluene is 5:3, the neutralizer E is an aqueous sodium hydroxide solution with a mass concentration of 1%, and the amount of sodium hydroxide is neutralized to PH =9, the washing operation temperature is 30°C, and the washed nitrotoluene mixture enters separation and purification.

Embodiment 2

[0037] like figure 1 As shown, 100 parts of crude nitrotoluene A, 50 parts of fresh water C, 20% of the flash water volume B evaporated from the waste water is, and all the flash water D is continuously added to the washing device, adjusted by the internal water circulation valve, so that the washing tank The volume ratio of the washing water in (2, 4, 6, 8) to the crude product of nitrotoluene is 5:1, the neutralizer E is an aqueous sodium hydroxide solution with a mass concentration of 4%, and the amount of sodium hydroxide is neutralized to PH=10, washing operation temperature is 40°C, and the washed nitrotoluene mixture enters separation and purification.

Embodiment 3

[0039] like figure 1 As shown, 100 parts of crude nitrotoluene A, 40 parts of fresh water C, 30% of the flash water volume B evaporated from the waste water, and all the flash water D are continuously added to the washing device and adjusted by the internal water circulation valve to make the washing kettle ( 2, 4, 6, 8) The volume ratio of the washing water to the crude nitrotoluene is 5:2, the neutralizer E is an aqueous sodium hydroxide solution with a mass concentration of 7%, and the amount of sodium hydroxide is neutralized to PH =12, the washing operation temperature is 50°C, and the washed nitrotoluene mixture enters separation and purification.

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Abstract

The invention discloses a nitrotoluene washing device and method. The device disclosed by the invention is composed of a mixing separator, a re-separator, an evaporator and a flash evaporator through pipes, the condensed water flashed by the mechanical vapour compression evaporator and the vacuum flashing water of crude nitrotoluene are used to perform countercurrent circulation washing to wash wastewater. The device disclosed by the invention has simple process, less energy consumption, high safety and high operational flexibility, is convenient in operations, can be used to save washing water, greatly reduce the quantity of wastewater, recycle materials and reduce the production cost and can be operated stably in a wider yield range.

Description

technical field [0001] The invention relates to a washing and impurity removal method and a production device for crude nitrotoluene deacidification and dephenolization in the production process of nitrotoluene produced by nitration of toluene, belonging to the fine technical field. Background technique [0002] Crude nitrotoluene is produced by toluene under the action of nitric sulfur mixed acid, which contains residual acid and polynitrophenol by-products which will bring danger to the rectification process. The washing of crude nitrotoluene is to use a certain concentration of lye to neutralize the residual acid contained in the crude nitrotoluene and make the nitrophenol react with the alkali to form sodium phenate, so that the sodium phenate is dissolved in water, so as to realize deacidification, The purpose of removing impurities from phenols. Only the crude nitrotoluene after washing can meet the requirements of further separation, and the products of o-nitrotoluen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C205/06C07C201/16
Inventor 董云
Owner JIANGSU HUAIHE CHEM
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