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Salt-containing waste water treatment method for meta-cresol production

A technology of salt-containing wastewater and treatment method, applied in heating water/sewage treatment, adsorption water/sewage treatment, water/sewage multi-stage treatment, etc. question

Inactive Publication Date: 2008-04-23
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adopting XDA-1 type macroporous resin to handle saline waste water has two deficiencies: 1. After XDA-1 type macroporous resin handles saline waste water, because sulfuric acid concentration is bigger in the waste water, XDA-1 type macroporous resin becomes It is black and needs to be regenerated with a large amount of dilute lye, which is easy to cause secondary pollution; 2. After treating saline wastewater with XDA-1 macroporous resin, COD in the recovered sulfuric acid Cr On the contrary, it becomes larger and directly reused in production, which will inevitably affect the reaction and product quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Get the saline waste water (m-cresol 100mg / L, COD Cr 3400mg / L) 10L, standing for stratification, the upper layer of gum oily substance is washed and distilled to recover m-cresol, and the residue is discarded; the lower layer of saline waste water is passed into secondary 100×50cm small filters each equipped with 700g powdered activated carbon In the process, the control flow rate is 100mL / min for adsorption, and the m-cresol content in the treated wastewater is reduced from 100mg / L to 0.1mg / L (4-aminoantipyrine spectrophotometric measurement), and the removal rate reaches 99.9%. COD Cr Reduced from the original 3400mg / L to 68mg / L, the removal rate reached 98%. Activated carbon is directly incinerated after reaching adsorption saturation.

[0020] Then the wastewater pretreated by activated carbon is treated by electrodialysis, using 5 pairs of membranes with an area of ​​200cm 2 The styrene sulfonic acid type cationic membrane and the styrene quaternary ammonium typ...

Embodiment 2

[0022] Get the saline waste water (m-cresol 200mg / L, COD Cr 5700mg / L) 10L, stand and stratify, the upper layer of gum oily substance is washed and distilled to recover m-cresol, and the residue is discarded; the lower layer of saline waste water is passed into two secondary 100×50cm small filters each equipped with 700g powdered activated carbon In the process, the control flow rate is 100mL / min for adsorption, and the m-cresol content in the treated wastewater is reduced from 200mg / L to 0.18mg / L (measured by 4-aminoantipyrine spectrophotometry), and the removal rate reaches 99.9%. COD Cr Reduced from the original 5700mg / L to 125mg / L, the removal rate reached 97.8%. Activated carbon is directly incinerated after reaching adsorption saturation.

[0023] Then the wastewater pretreated by activated carbon is treated by electrodialysis, using 5 pairs of membranes with an area of ​​200cm 2 The styrene sulfonic acid type cationic membrane and the styrene quaternary ammonium type ...

Embodiment 3

[0025] Get the saline waste water (m-cresol 500mg / L, COD Cr 8450mg / L) 10L, leave standstill and stratify, discard after washing and distillation reclaiming m-cresol for the upper layer of gum oily substance; the lower layer of saline waste water is passed into the secondary 100 * 50cm small-sized filter that each is equipped with 700g powdered activated carbon, Control the flow rate to 90mL / min for adsorption, the content of m-cresol in the treated wastewater is reduced from 500mg / L to 10mg / L, the removal rate reaches 98%, and the COD Cr From 8450mg / L to 850mg / L, the removal rate reached about 90%. Activated carbon is directly incinerated after reaching adsorption saturation.

[0026] Then the wastewater pretreated by activated carbon is treated by electrodialysis, using 5 pairs of membranes with an area of ​​200cm 2 The styrene sulfonic acid type cationic membrane and the styrene quaternary ammonium type anion membrane were electrodialyzed at 90V for 40min at 20°C, and the ...

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Abstract

This invention relates to a method for treating salt-containing waste-water from the production of M-cresol. The waste-water, after pre-treatment of absorption by powder activated carbon, is proceeded the electroosmosis treatment. The effluent is used as sulphuric acid solution for cyclic utilization, the residual salt-containing waste-water is neutralized for production of mirabilite. In this invention, the recovered sulphuric acid solution, after the treatment, contains Naf ion with its concentration being lower than 2g / L, the sulphuric acid solution recovery rate is upto 80%, and being able to be utilized in hydrolytic reaction for M-cresol production. This method is useful for environmental protection.

Description

technical field [0001] The present invention relates to a treatment method of organic chemical waste water, more specifically, relates to the treatment method of salty waste water produced in m-cresol production process. Background technique [0002] m-cresol, chemical name 3-hydroxytoluene, molecular formula C 7 h 8 O, is a colorless to light yellow flammable liquid with phenol smell, it can be used in industries such as medicine, pesticide, dye, spice, resin, plasticizer, film, antioxidant and reagent, mainly used in synthesis speed Dicarb, fenthion, antioxidant CA, tribromocresol, 4-nitro-m-cresol, 3-phenoxytoluene, m-cresol, m-methyldiphenylaldehyde, calcium cresylsulfonate , Disperse Yellow SE-5R, chlorocresol m-cresyl ester, 2-chloro-5-cresol, 4-chloro-3-cresol, m-hydroxybenzaldehyde and other chemical raw materials and products. [0003] Hao Yanxia et al. (Journal of Fire and Explosives, No. 1, 2002) proposed a new way of synthesizing m-cresol with m-nitrotoluene a...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F1/04C02F1/40C02F1/28C02F1/469C01D5/00
Inventor 曹端林郑志花崔建兰门吉英吕春绪陆明
Owner ZHONGBEI UNIV
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