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Treatment method of production wastewater of epoxypropane prepared by co-oxidation method

A treatment method, propylene oxide technology, applied in the direction of special compound water treatment, biological water/sewage treatment, water/sewage treatment, etc., can solve the problem of no relatively mature system process, low peroxide removal efficiency, and production unit consumption increase and other issues, to achieve the effect of improving process safety, saving construction and operating costs, and saving costs

Active Publication Date: 2021-06-22
WANHUA CHEM GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method has the disadvantages of low peroxide removal efficiency, long reaction time, high operating cost and large oxygen generation, and it is difficult to improve the safety and stability of the process in essence; at the same time, the cost of direct incineration of wastewater is high, and wastewater cannot be recycled Medium-valued components, resulting in increased production unit consumption
[0005] At present, there are few researches on POSM and POCHP process wastewater treatment process, and there is no relatively mature system process flow

Method used

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  • Treatment method of production wastewater of epoxypropane prepared by co-oxidation method

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Experimental program
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Effect test

Embodiment 1

[0064] Such as figure 1 Shown, a kind of co-oxidation method prepares the processing method of propylene oxide production waste water as follows:

[0065] (1) The first part of waste water is sent to the catalytic oxidation reactor 1 in advance to carry out the catalytic oxidation reaction, to remove the peroxide therein, obtain the discharge waste water from the outlet of the catalytic oxidation reactor 1; Part of the discharge waste water of the device 1 is circulated into the catalytic oxidation reactor 1 from its feed port; an alkaline solution is added to the discharge waste water of the circulation part, so that the alkaline solution is mixed with the discharge of the circulation part. The waste water is transported into the catalytic oxidation reactor 1 to increase the pH of the material system therein;

[0066] (2) The mixed wastewater obtained after mixing the discharged wastewater with the second part of wastewater is input to the first rectification tower 21 in the...

Embodiment 2

[0092] Processing method is identical with embodiment 1;

[0093] The processing conditions are as follows:

[0094] The co-oxidation method for preparing propylene oxide system 7 is a POSM system from Yantai Wanhua Industrial Park. In the waste water produced by it, in the first part of waste water, the content of peroxide is 28000mg / L, and the COD is 100000mg / L ; In the second part of waste water, the peroxide content is 45mg / L;

[0095] The catalyst used in the catalytic oxidation reaction is MnO 2 / NiO composite catalyst, MnO 2 The mass ratio of NiO to NiO is 2:1; the temperature of the catalytic oxidation reaction is 70°C, and the feed space velocity is 2h -1 , the resulting discharge waste water after decomposition by catalytic oxidation reaction, its circulation ratio is 1.5; the alkaline solution that this part of circulation discharge waste water is input is NaOH solution, and concentration is 25wt%, and its addition makes described catalytic oxidation reactor The p...

Embodiment 3

[0108] Processing method is identical with embodiment 1;

[0109] The processing conditions are as follows:

[0110] The system 7 for preparing propylene oxide by the co-oxidation method is a POSM system from Yantai Wanhua Industrial Park. In the waste water produced by it, in the first part of waste water, the content of peroxide is 20000mg / L, and the COD is 10000mg / L ; In the second part of waste water, the peroxide content is 30mg / L;

[0111] The catalyst used in the catalytic oxidation reaction is MnO 2 / NiO composite catalyst, MnO 2 The mass ratio of NiO to NiO is 1:1; the temperature of the catalytic oxidation reaction is 20°C, and the feed space velocity is 4h -1 , the discharge waste water gained after catalytic oxidation reaction decomposition, its circulation ratio is 1.5; The alkaline solution that this part of circulation discharge waste water is input is NaOH solution, and concentration is 20wt%, and its addition makes described catalytic oxidation reactor The...

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Abstract

The invention provides a treatment method of production wastewater of epoxypropane prepared by a co-oxidation method. The production wastewater comprises a first part of wastewater with peroxide content of 2000 mg / L or above and a second part of wastewater with peroxide content of less than 50 mg / L. The treatment method comprises the following steps: (1) carrying out catalytic oxidation on the first part of wastewater to obtain material wastewater; (2) mixing the discharged wastewater with a second part of wastewater, and rectifying through a first rectifying tower to obtain a first tower top material and primary concentrated wastewater as a first tower kettle liquid; rectifying the first tower bottoms through a second rectifying tower to obtain a second tower top material and secondary concentrated wastewater serving as second tower bottoms; performing oil-water separation on the first tower top material and the second tower top material through a third rectifying tower; (3) carrying out incineration treatment on the second tower bottoms; and (4) carrying out biochemical treatment on the third tower bottoms. The treatment method is suitable for high-salt, high-organic-matter-content and high-peroxide-content wastewater, peroxide in the wastewater can be removed, the biodegradability of the wastewater is improved, and the wastewater treatment difficulty and cost are reduced.

Description

technical field [0001] The invention belongs to the field of waste water treatment, in particular to a treatment method for preparing propylene oxide production waste water by a co-oxidation method. Background technique [0002] Propylene oxide (PO) is a colorless, transparent, flammable liquid with a low boiling point. It is the third class of propylene derivatives besides acrylonitrile and polypropylene, and plays an important role in organic chemical production. At present, the methods for producing propylene oxide in China mainly include the chlorohydrin method and the co-oxidation method (including the co-oxidation thiobarbituric acid method for the co-production of methyl tert-butyl ether, namely POMTBE; the co-production of ethylbenzene for the co-production of styrene method, namely POSM; cumene peroxide method, namely POCHP method), direct oxidation method (including HPPO method using hydrogen peroxide as oxidant). [0003] With my country's increasingly stringent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F9/10C07C29/00C07C33/20C07C33/22C02F101/30C02F103/36F23G7/04
CPCC02F9/00C07C29/00C02F1/722C02F1/725C02F2101/30C02F2305/023C02F2103/36C02F1/04C02F1/66C02F1/40C02F3/00F23G7/04C07C33/20C07C33/22
Inventor 范珍龙董岩峰曾凡雪叶建初冷炳文虞根海贺信淳张宏科
Owner WANHUA CHEM GRP CO LTD
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