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Method for preparing Fe3O4 from wastewater in chlorobenzene production

A waste water and chlorobenzene technology, applied in the direction of iron oxide, iron oxide/iron hydroxide, etc., can solve the problems of difficult solid waste, unstable operation, inconvenient storage, etc., to reduce operating costs and labor Continuous and stable load and operation, avoiding time-consuming and labor-intensive effects

Active Publication Date: 2017-01-11
ANHUI BAYI CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing process equipment has the following problems: 1. The technology is backward, the structure of the equipment is unreasonable, and the maintenance is frequent; the hybrid power is provided by the Roots blower, and the neutralization effect is not ideal, and the intermittent production can no longer meet the increasing demand for production; 2. 1. Using a filter press to process the neutralized slurry, the filter cake has a large water content and salt content, which is inconvenient to store, and it is difficult to use as solid waste, wasting resources and increasing production costs; 3. The device occupies a large area and "three wastes" "Serious pollution, cumbersome operation, unstable operation, it is difficult to discharge wastewater up to standard

Method used

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  • Method for preparing Fe3O4 from wastewater in chlorobenzene production
  • Method for preparing Fe3O4 from wastewater in chlorobenzene production

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Such as figure 1 Shown:

[0046] A kind of waste water that is produced with chlorobenzene prepares Fe 3 o 4 method, including the following steps:

[0047] S1, pre-reaction: add washing waste water and Na to the first container 1 2 SO 3 Aqueous solution, the residence time is controlled at 0.75h, wherein, the first container 1 keeps stirring constantly;

[0048] S2. Pre-neutralization: add the first neutralization reagent to the solution in the first container 1 for pre-mixing, then transfer to the second container 2 filled with protective gas, maintain the temperature at 58°C, and stir until the solution pH=6 to obtain Solution A;

[0049]S3. Post-reaction: transfer the solution A in the second container 2 to the third container 3 filled with protective gas, maintain the temperature at 165° C., add the second neutralizing agent, and stir until the solution pH=12 to obtain the solution B;

[0050] S4. Aging: Transfer the solution B in the third container 3 to th...

Embodiment 2

[0054] Such as figure 1 Shown:

[0055] A kind of waste water that is produced with chlorobenzene prepares Fe 3 o 4 method, including the following steps:

[0056] S1. Pre-reaction: add washing wastewater and Na with a concentration of 2mol / L to the first container 1 2 SO 3 Aqueous solution, the residence time is controlled at 0.5h, wherein, the first container 1 keeps stirring constantly, SO 3 2- and Fe in washing wastewater 3+ The molar ratio is 2.5:1;

[0057] S2. Pre-neutralization: add the first neutralization reagent to the solution in the first container 1 and pre-mix with the static mixer 6, then transfer to the second container 2 filled with nitrogen, maintain the temperature at 50°C, and stir until the solution pH=7.5 obtains solution A, wherein, the first neutralization reagent is that the mass fraction is 5wt% sodium hydroxide aqueous solution, the second container 2 is U-shaped, and the flow rate of nitrogen is 5m 3 / h;

[0058] S3. Post-reaction: Transf...

Embodiment 3

[0063] Such as figure 1 Shown:

[0064] A kind of waste water that is produced with chlorobenzene prepares Fe 3 o 4 method, including the following steps:

[0065] S1. Pre-reaction: add washing wastewater and Na with a concentration of 3mol / L to the first container 1 2 SO 3 Aqueous solution, the residence time is controlled at 1h, wherein, the first container 1 keeps stirring constantly, SO 3 2- and Fe in washing wastewater 3+ The molar ratio is 1.5:1;

[0066] S2. Pre-neutralization: add the first neutralization reagent to the solution in the first container 1 and pre-mix with a static mixer 6, then transfer to the second container 2 filled with nitrogen, maintain the temperature at 65 ° C, and stir until the solution pH=2.2 obtains solution A, wherein, the first neutralization reagent is in the waste lye, the second container 2 is U-shaped, and the flow rate of nitrogen is 10m 3 / h;

[0067] S3. Post-reaction: Transfer the solution A in the second container 2 to th...

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Abstract

The invention discloses a method for preparing Fe3O4 from wastewater in chlorobenzene production. The method includes the steps that S1, a pre-reaction is carried out, wherein washing wastewater and a Na2SO3 water solution are added into a first container and stay within 0.5-1h, and stirring is kept constant in the first container; S2, pre-neutralization is carried out, wherein a first neutralization reagent is added into a solution in the first container for premixing, then the mixture is transferred into a second container charged with shielding gas, temperature is kept at 50-65 DEG C, stirring is carried out till the pH value of the solution ranges from 2.2 to 7.5, and then a solution A is obtained; S3, after-reaction is carried out, wherein the solution A in the second container is transferred into a third container charged with shielding gas, temperature is kept at 155-175 DEG C, a second neutralization reagent is added for stirring till the pH value ranges from 10 to 14, and then a solution B is obtained; S4, ageing is carried out; S5, washing is carried out; S6, dehydrating and drying are carried out. Multi-kettle continuous production can be achieved, the operation cost and labor amount can be greatly reduced, and operating is continuous and stable.

Description

technical field [0001] The invention relates to the preparation of Fe from wastewater 3 o 4 Technical field, relate in particular to a kind of waste water that is produced with chlorobenzene prepares Fe 3 o 4 Methods. Background technique [0002] Chlorobenzene is an important chemical raw material, and its production adopts the "benzene boiling method", that is, benzene and chlorine gas are mixed and reacted in a chlorination tower with ferric chloride as a catalyst, and the obtained chlorinated solution is washed with water and alkali Washing process; the washing wastewater mainly contains ferric chloride, hydrochloric acid and a small amount of organic matter, and the alkaline washing wastewater mainly contains sodium hydroxide, sodium chloride, flocculent ferric hydroxide and a small amount of organic matter. The wastewater is pumped to the wastewater treatment section for acid-benzene and alkali-benzene separation, the upper organic phase is pumped to the chlorinati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/08
CPCC01G49/08
Inventor 李德昌祁方王付昌
Owner ANHUI BAYI CHEM IND
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