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Process for preparing black iron oxide by utilizing wastewater generated in production of chlorinated benzene

A technology of iron oxide black and chlorinated benzene, which is applied in the directions of ferrous oxide, iron oxide/iron hydroxide, etc., can solve the problem of difficult treatment of waste water, and achieves lower waste water treatment costs, lower production costs, and stable operation. Effect

Inactive Publication Date: 2014-04-30
ANHUI BAYI CHEM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved in the present invention is to provide a process for preparing iron oxide black from waste water produced by chlorinated benzene, which can not only solve the difficult problem of waste water in the production process of chlorinated benzene, but also turn waste into treasure, and the process flow Simple, low energy consumption, environmental protection, easy to operate

Method used

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  • Process for preparing black iron oxide by utilizing wastewater generated in production of chlorinated benzene
  • Process for preparing black iron oxide by utilizing wastewater generated in production of chlorinated benzene
  • Process for preparing black iron oxide by utilizing wastewater generated in production of chlorinated benzene

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Embodiment 1

[0032] Such as figure 1 Shown:

[0033] Utilize the waste water produced by chlorinated benzene to prepare the technique of iron oxide black, concrete steps are as follows:

[0034] (1) Waste acid water feeding: check the liquid level of washing waste water tank 1, and feed waste acid water into titanium reactor 3. When the liquid level reaches 70% of the volume of reactor 3, stop feeding waste acid water and open the steam valve , the steam pressure is controlled at 0.1 MPa, and the stirring speed is controlled at 80 r / min to stir at a constant speed;

[0035] (2) Add reducing agent: when the reaction temperature reaches 60 °C, close the steam valve, add reducing agent 4 according to the molar ratio of ferric ion and reducing agent in the solution is 1.5:1, reducing agent 4 is reduced iron powder, when the solution When the color changes from light yellow to yellow-green, it can be considered that the reduced iron powder is completely dissolved. At this time, the Fe in the ...

Embodiment 2

[0041] Such as figure 1 Shown:

[0042] Utilize the waste water produced by chlorinated benzene to prepare the technique of iron oxide black, concrete steps are as follows:

[0043] (1) Feed waste acid water: check the liquid level of washing waste water tank 1, feed waste acid water into titanium reactor 3, stop feeding waste acid water when the liquid level reaches 80% of the volume of reactor 3, and open the steam valve , the steam pressure is controlled at 0.2 MPa, and the stirring speed is controlled to rotate and stir at a rotating speed of 50 r / min;

[0044] (2) Add reducing agent: when the reaction temperature reaches 80 °C, close the steam valve, add reducing agent 4 according to the molar ratio of ferric ion and reducing agent in the solution is 2.5:1, reducing agent 4 is reduced iron powder, when the solution When the color changes from light yellow to yellow-green, it can be considered that the reduced iron powder is completely dissolved. At this time, the Fe in ...

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Abstract

The invention discloses a process for preparing black iron oxide by utilizing wastewater generated in production of chlorinated benzene. The process comprises the following concrete steps: reducing the Fe<3+> in water-washing waste acid water generated in the production of the chlorinated benzene to be Fe<2+> in a reaction kettle by using a reducing agent, then adding alkaline water to react the Fe<2+> and alkaline to form iron mud (Fe(OH)2), depositing the iron mud in a settling vat to obtain an iron mud solid, filtering the iron mud solid by a filter press, oxidizing the iron mud solid into the black iron oxide (Fe3O4) at an alkaline condition, sending the clear water in the upper part of the reaction kettle and the clear water settled in the upper part of the settling vat into a resin column for adsorbing organics, and then discharging the water into a clear water treating pond for treatment. According to the product black iron oxide prepared by the process, utilization of solid wastes is realized, wastes are changed into valuable things and the cost is saved; by using a separating and setting apparatus, separation of the iron mud and the water is realized, the energy consumption is reduced, and the content of insoluble solid substances in the water is greatly reduced; by using the resin column to adsorb the organics in the water, up-to-standard discharge of the wastewater is realized.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment in organic chemical production technology, in particular to a process for preparing iron oxide black from waste water produced by chlorinated benzene. technical background [0002] Chlorinated benzene is produced by reacting benzene and chlorine gas in a chlorination reactor with ferric chloride as a catalyst, and the reacted chlorinated solution enters the washing and alkali washing processes, and the waste acid water after washing mainly contains ferric chloride (content 15-20 g / L), hydrochloric acid (mass concentration 5-10%) and a small amount of organic matter; the waste alkaline water after alkali washing mainly contains sodium hydroxide (mass concentration 3-7%), iron hydroxide and a small amount of organic matter . Washing and alkali washing wastewater enters the waste acid water and waste alkali water storage tanks for acid-benzene and alkali-benzene separation, and the upper or...

Claims

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Application Information

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IPC IPC(8): C01G49/08
Inventor 李德昌祁方朱林林
Owner ANHUI BAYI CHEM IND
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