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Circulating separated resourceful treatment method for m-cresol production wastewater

A waste water production and recycling technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as inability to synchronize, unrealized recycling of resources, etc., to achieve The effect of shortening the processing cycle, lowering the cost and improving the efficiency

Inactive Publication Date: 2014-08-13
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the problems existing in the prior art that waste water treatment has not realized resource recovery and that waste water m-cresol adsorption and m-toluidine desorption cannot be carried out synchronously, the present invention provides a m-cresol production waste water circulation separation resource processing method

Method used

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  • Circulating separated resourceful treatment method for m-cresol production wastewater
  • Circulating separated resourceful treatment method for m-cresol production wastewater
  • Circulating separated resourceful treatment method for m-cresol production wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The treated m-cresol production wastewater was taken from a chemical plant in Huaian, Jiangsu, and the water quality components are shown in Table 2.

[0035] Table 2 Example 1 intermediate cresol production wastewater water quality

[0036]

[0037] Two parts of 1.8mL (about 0.5g) NDA150 resin were loaded into two jacketed glass adsorption columns (φ8×240mm), which were the first-stage resin column and the third-stage resin column.

[0038] Fill 818mL of anion exchange resin soaked in 2mol / L sulfuric acid solution into a jacketed plexiglass adsorption column (φ47×472mm), which is the second-stage resin column.

[0039] combine figure 1 , the present embodiment a kind of method for m-cresol production waste water circulation separation quality recycling treatment, and its steps are:

[0040] A) 215mL of m-cresol production wastewater that was filtered to remove suspended matter was pumped into a first-stage resin column filled with NDA150 resin at a flow rate of 5B...

Embodiment 2

[0048] The resin consumption of the present embodiment is the same as above.

[0049] A) 203mL of m-cresol production waste water that has been filtered to remove suspended matter is pumped into a first-stage resin column filled with NDA150 resin at a flow rate of 3BV / h at 30°C to remove m-cresol in the waste water;

[0050] B) pump the effluent after passing through the first-stage resin column into the second-stage resin column filled with anion exchange resin at a flow rate of 5BV / h at 30°C;

[0051] C) adjust the pH of the effluent passing through the second-stage resin column to 12.3, and pump it into the third-stage resin column filled with NDA150 resin at a flow rate of 3BV / h at 30°C to achieve the removal of m-toluidine;

[0052] D) The pH of the effluent from the third-stage resin column was 12.5, and the concentrations of m-cresol and m-toluidine were 1.7 mg / L and 0.6 mg / L, respectively. Part of the effluent from the third-stage resin column was used as a regenerant...

Embodiment 3

[0057] The resin consumption of the present embodiment is the same as above.

[0058] A) 210mL of m-cresol production wastewater that was filtered to remove suspended matter was pumped into a first-stage resin column filled with NDA150 resin at a flow rate of 2BV / h at 20°C to remove m-cresol in the wastewater;

[0059] B) pump the effluent after passing through the first-stage resin column into the second-stage resin column filled with anion exchange resin at a flow rate of 8BV / h at 30°C;

[0060] C) adjust the pH of the effluent passing through the second-stage resin column to 12.7, and pump it into the third-stage resin column filled with NDA150 resin at a flow rate of 2BV / h at 20°C to achieve the removal of m-toluidine;

[0061] D) The pH of the effluent from the third-stage resin column is 12.9, and the concentrations of m-cresol and m-toluidine are 1.4 mg / L and 0.4 mg / L respectively; part of the effluent from the third-stage resin column is used as a regeneration agent at...

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Abstract

The invention discloses a circulating separated resourceful treatment method for m-cresol production wastewater, which belongs to the field of organic chemical wastewater treatment. The method disclosed by the method comprises the following steps: A) pumping filtered wastewater into a first-stage resin column filled with ultra-high crosslinking resin; B) pumping water discharged from the first-stage resin column into a second-stage resin column filled with ion exchange resin; C) adjusting the pH value of water discharged from the second-stage resin column to be 9-13, and pumping the water into a third-stage resin column filled with ultra-high crosslinking resin; D) preparing a regenerant by using water discharged from the third-stage resin column so as to regenerate the first-stage resin column; E) regenerating the second-stage resin column by taking clean water as a regenerant; and F) regenerating the third-stage resin column by taking raw water as a regenerant, and simultaneously taking the processes as a next-batch first-stage resin adsorption process. According to the method disclosed by the invention, the resourceful recovery of m-cresol, m-toluidine and a sulfuric acid in highly acid salt-containing wastewater discharged in the process of preparing m-cresol by using a diazotization-hydrolysis method is realized.

Description

technical field [0001] The invention belongs to the field of organic chemical wastewater treatment, and more specifically relates to a method for the recycling and recycling of m-cresol production wastewater based on low-consumption resin regeneration. Background technique [0002] m-cresol is an important dye intermediate, and can also be used as a raw material for disinfectants, synthetic resins, preservatives, and film production. Before 2015, my country's demand for m-cresol will increase at a rate of 8%-10%. [0003] m-cresol production wastewater is a typical high-acid, high-salt, high-COD, high-chroma dye intermediate wastewater, which mainly comes from the diazotization-hydrolysis preparation process of m-cresol. Due to the unique advantages of mild reaction conditions and simple process operation, this process has become the mainstream method for m-cresol production in China. In the process of preparing m-cresol by diazotization-hydrolysis method, a relatively hig...

Claims

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Application Information

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IPC IPC(8): C02F9/04C01B17/90C07C39/07C07C37/82C07C211/47C07C209/86C02F1/42
Inventor 刘福强孙晓文陈达陶学文吴秋原李爱民
Owner NANJING UNIV