Treatment and resource process for high-salt and high-COD wastewater produced from epichlorohydrin production using glycerol method

A technology of epichlorohydrin and high-salt wastewater, applied in the field of electrodialysis desalination, to achieve the effect of great application potential

Inactive Publication Date: 2018-05-01
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0022] In order to overcome the existing problems in the treatment of waste water from epichlorohydrin production, the present invention separates the salt and COD in the waste water by introducing electrodialysis technology, and then provides a new treatment and treatment method for the high-salt waste water produced by the preparation of epichlorohydrin by the glycerol method. Recycling process

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  • Treatment and resource process for high-salt and high-COD wastewater produced from epichlorohydrin production using glycerol method
  • Treatment and resource process for high-salt and high-COD wastewater produced from epichlorohydrin production using glycerol method
  • Treatment and resource process for high-salt and high-COD wastewater produced from epichlorohydrin production using glycerol method

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Embodiment 1

[0047] Epichlorohydrin wastewater comes from a certain factory, and its composition is: NaCl content 8.9wt.%, COD 11769mg / L, does not contain calcium, magnesium and other metal ions, pH=12.

[0048] The electrodialyzer includes a pair of positive and negative plates, 200 anion-exchange membranes, 201 cation-exchange membranes, 2 separators between the ion-exchange membranes and the plates, and 400 flow channels between the anion-cation exchange membranes. The positive membrane is a sulfonic acid type homogeneous cation exchange membrane with a thickness of about 0.130mm and a resistance of 9.9Ω.cm 2 , the water content is 25%; the anion membrane is a quaternary ammonium type homogeneous anion exchange membrane, the thickness is about 0.150mm, and the resistance is 11.6Ω.cm 2 , the water content is 35%; the area of ​​a single membrane is about 0.5m 2 . The thickness of the separator and flow channel is about 0.5mm, with 0.1M Na 2 SO 4 The solution is a polar liquid, a volta...

Embodiment 2

[0052] Epichlorohydrin wastewater comes from a factory, and its composition is: NaCl content 7.6wt.%, COD 14392mg / L, does not contain calcium, magnesium and other metal ions, pH=12.

[0053] The electrodialyzer includes a pair of positive and negative plates, 10 anion-exchange membranes, 11 cation-exchange membranes, 2 separators between the ion-exchange membranes and the plates, and 20 flow channels between the anion-cation exchange membranes. The positive membrane is a sulfonic acid type homogeneous cation exchange membrane with a thickness of about 0.130mm and a resistance of 9.9Ω.cm 2 , the water content is 25%; the anion membrane is a quaternary ammonium type homogeneous anion exchange membrane, the thickness is about 0.150mm, and the resistance is 11.6Ω.cm 2 , the water content is 35%; the area of ​​a single membrane is about 0.03m 2 . The thickness of the separator and flow channel is about 0.5mm, with 0.1M Na 2 SO 4 The solution is a polar liquid, a voltage of 5.6V...

Embodiment 3

[0058] Epichlorohydrin wastewater comes from a factory and consists of: CaCl 2 Content 6.65wt.%, COD is 10903mg / L, does not contain calcium magnesium and other metal ions, pH=12.

[0059] The pH was adjusted below 7 by adding a small amount of HCl. The electrodialyzer includes a pair of positive and negative plates, 10 anion-exchange membranes, 11 cation-exchange membranes, 2 separators between the ion-exchange membranes and the plates, and 20 flow channels between the anion-cation exchange membranes. The positive membrane is a heterogeneous cation exchange membrane with a thickness of about 0.40mm and a resistance of 30Ω.cm 2 , the water content is 40%; the anion membrane is a quaternary ammonium type homogeneous anion exchange membrane, the thickness is about 0.45mm, and the resistance is 31.6Ω.cm 2 , the water content is 40%; the area of ​​a single membrane is about 0.03m 2 . The thickness of the separator and flow channel is about 0.5mm, with 0.1M Na 2 SO 4 The solut...

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Abstract

The invention belongs to an electrodialysis desalination technology, and particularly relates to a treatment and resource method for high-salt and high-COD wastewater produced from epichlorohydrin production using a glycerol method. According to the treatment and resource method, high-salt wastewater to be treated is subjected to electrodialysis to extract the salt in the wastewater, COD is further removed by using a biochemical method, the treated wastewater is reused or is directly discharged, and the extracted salt water is subjected to membrane distillation or multi-effect evaporation concentration crystallization to obtain the industrial salt so as to be recycled. According to the present invention, with the process, the condition that the salt recovered directly through the membranedistillation or multi-effect evaporation concentration crystallization cannot be sold due to the high organic matter content and becomes the solid waste is avoided, and the influence of the too high salinity on the stable operating of the biochemical system is avoided; with the process, the wastewater problem is solved, the water in the wastewater is reused, the salt in the wastewater is subjectedto resource, and methane produced through the biochemical treatment of the organic matter can be used for heating and power generation, such that the application potential is great.

Description

technical field [0001] The invention belongs to the electrodialysis desalination technology, in particular to a treatment and recycling method of high-salt and high-COD waste water produced by preparing epichlorohydrin with a glycerin method. Background technique [0002] Epichlorohydrin is an important organic chemical raw material and fine chemical intermediate, mainly used in the production of epoxy resin, reinforced resin, water treatment resin, etc. In recent years, more and more epoxy resins have been used in electronics, automobiles, aerospace and other industries, resulting in an increasing demand for epichlorohydrin. [0003] At present, epichlorohydrin is mainly produced by high-temperature chlorination of propylene, which mainly includes three-step reactions: [0004] CH 2 CHCH 3 +Cl 2 →CH 2 CHCH 2 Cl+HCl [0005] CH 2 CHCH 2 Cl+HClO→CH 2 ClCHOHCH 2 Cl [0006] CH 2 ClCHOHCH 2 Cl+Ca(OH) 2 Or NaOH→epichlorohydrin+CaCl 2 or NaCl [0007] With the ra...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/469C02F103/36
CPCC02F1/048C02F1/447C02F1/4693C02F3/00C02F9/00C02F2103/36Y02A20/124
Inventor 谭明张杨逯云玲史元腾刘庆德齐运峰
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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