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A method for treating salt-containing wastewater in the production process of propylene oxide or epichlorohydrin and device for realizing the method

A technology for the production process of epichlorohydrin, which is applied in the field of salty wastewater treatment, can solve problems such as pollution and low energy consumption, and achieve the effects of good economic benefits, low energy consumption, and low cost

Active Publication Date: 2018-02-27
BEFAR GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The invention provides a method for treating salty wastewater in the production process of propylene oxide or epichlorohydrin and a device for realizing the method, which has low energy consumption and can recycle propylene oxide or epichlorohydrin to the greatest extent. Calcium chloride in the saline wastewater produced in the process solves the pollution problem of propylene oxide or epichlorohydrin saline wastewater and realizes the recycling of wastewater

Method used

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  • A method for treating salt-containing wastewater in the production process of propylene oxide or epichlorohydrin and device for realizing the method
  • A method for treating salt-containing wastewater in the production process of propylene oxide or epichlorohydrin and device for realizing the method
  • A method for treating salt-containing wastewater in the production process of propylene oxide or epichlorohydrin and device for realizing the method

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Effect test

Embodiment 1

[0047] After cooling the salty wastewater to 36°C in a cooling tower, it is transported to the first settling tank for sedimentation, and then the settled wastewater is placed in a regulating tank for pre-aeration, and then transported to the blast aeration tank Oxygen aeration. The activated sludge is transported to the blast aeration tank, and a part of the activated sludge comes from the second settling tank, and is mixed with the wastewater for aeration and oxygen supply. After the mixed sludge mixture is returned to the second settling tank for settling, the supernatant is placed in the contact oxidation tank for secondary oxidation treatment, and the remaining turbidity in the lower layer is stored in the second settling tank; after secondary oxidation The treated supernatant is placed in the third settling tank for settling treatment and then transported to the solar salt tank. The COD of the pretreated wastewater is 30ppm, and the content of calcium chloride is 3.95% ...

Embodiment 2

[0051] After cooling the salty wastewater to 36.5°C in a cooling tower, it is transported to the first settling tank for sedimentation, and then the settled wastewater is placed in a regulating tank for pre-aeration, and then transported to the blast aeration tank Oxygen aeration. The activated sludge is transported to the blast aeration tank, and a part of the activated sludge comes from the second settling tank, and is mixed with the wastewater for aeration and oxygen supply. After the mixed sludge mixture is returned to the second settling tank for settling, the supernatant is placed in the contact oxidation tank for secondary oxidation treatment, and the remaining turbidity in the lower layer is stored in the second settling tank; after secondary oxidation The treated supernatant is placed in the third settling tank for settling treatment and then transported to the solar salt tank. The COD of the pretreated wastewater is 40ppm. The content of calcium chloride is 5% base...

Embodiment 3

[0055] The salty wastewater is transported to multiple sun-drying ponds through pipelines for drying to obtain a calcium chloride feed liquid with a calcium chloride content of 45wt% based on the total mass of the calcium chloride solution. The impurity COD in the wastewater is reduced to 300ppm, and the calcium chloride The feed liquid is transported to the brine collection pool through the pumping system.

[0056] The calcium chloride feed liquid obtained by sun drying is transported to the feed liquid buffer tank, and the pH is adjusted to 7. After pressure filtration, it enters the solution evaporator through the delivery pump to increase concentration. The temperature during concentration is 220°C, and then enters the high temperature temporary storage tank. At this time, based on the total mass of the calcium chloride solution entering the high-temperature temporary storage tank, the content of calcium chloride is 50.6wt%, and then transported to the spray granulation flu...

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Abstract

The present invention relates to a method for treating salt-containing wastewater in a production process of epoxy propane or epoxy chloropropane and an apparatus for implementing the method. The method comprises the following steps of: firstly, putting wastewater into a saltern pool to perform sun-curing, thereby obtaining a calcium chloride solution which comprises 13-50wt%, preferably 30-45wt% of of calcium chloride, based on the total weight of the sun-cured solution; and then, drying the sun-cured calcium chloride solution, thereby obtaining solid calcium chloride. According to the present invention, the method and apparatus are low in energy consumption, and the calcium chloride produced in an epoxy propane and epoxy chloropropane salt-containing wastewater production process can be recycled and utilized to the greatest extent, a pollution problem of epoxy propane and epoxy chloropropane salt-containing wastewater is solved, and wastewater recycling and reusing are realized.

Description

technical field [0001] The invention relates to a treatment method for saline wastewater in the production process of propylene oxide or epichlorohydrin and a device for realizing the method, belonging to the field of wastewater treatment. Background technique [0002] Propylene oxide is an important organic chemical raw material. It is the third largest propylene derivative after polypropylene and acrylonitrile among propylene derivatives. It is widely used in the production of polyether, propylene glycol, and surfactants. With the development of polyurethane synthetic materials, unsaturated polyester resins, advanced synthetic detergents and other products, the demand for propylene oxide is increasing year by year. Epichlorohydrin is also an important organic chemical raw material and fine chemical product. Epoxy resins made from epichlorohydrin are widely used in the fields of glass fiber reinforced plastics, coatings, adhesives, and electronic laminates. [0003] At pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/14C02F9/14C01F11/30C02F101/20C02F103/36
CPCY02A20/212Y02P20/133Y02W10/33
Inventor 杨振军马浩胡海峰林新伟邵海洋赵建芳姜涛刘振科柳宏业
Owner BEFAR GROUP CO LTD