Continuous pretreatment method of maleic anhydride emulsifying waste water

A technology for emulsification of wastewater and maleic anhydride, applied in multi-stage water treatment, water/sewage treatment, natural water treatment, etc., can solve the problems of increased energy consumption, complex process and high production cost

Active Publication Date: 2015-01-14
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although this treatment method has a good treatment effect, the process is complicated, the production cost is high, and the economic benefit is poor; when calcium oxide and acidic flocs are used, a large amount of solid hazardous waste will be generated, and the flocs are difficult to filter, which will significantly increase energy consumption.

Method used

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  • Continuous pretreatment method of maleic anhydride emulsifying waste water

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of the adsorbent:

[0035] The lignite is ground by a coal mill to obtain coal powder with a particle size of 15-30 μm. The raw material of diatomite is dried at 120°C and pulverized by high-pressure airflow. Coal powder and diatomaceous earth are ground and mixed according to the mass ratio of 9:1 to obtain the adsorbent.

[0036] Wastewater treatment process:

[0037] The COD 9500 in the supernatant liquid I obtained after the maleic anhydride emulsified wastewater was settled in the settling tank, the content of dibutyl phthalate was 0.15% (wt), and the supernatant liquid I was continuously added to the stirring adsorption tank at 500kg / h, and the adsorption The agent is continuously added into the stirring adsorption tank at a rate of 10kg / h through a feeder, and the residence time is controlled at 20min to obtain a mixed slurry. After the mixed slurry is separated by a solid-liquid separator, the separated solid is dried and incinerated. Add polyalu...

Embodiment 2

[0039] Preparation of the adsorbent:

[0040] The lignite is ground by a coal mill to obtain coal powder with a particle size of 15-30 μm. The raw material of diatomite is dried at 120°C and pulverized by high-pressure airflow. Coal powder and diatomaceous earth are ground and mixed in a mass ratio of 9:1.

[0041]Wastewater treatment process:

[0042] After the maleic anhydride emulsified wastewater settles in the settling tank, the COD is 16300, and the dibutyl phthalate content is 0.78% (wt). It is continuously added to the stirring adsorption tank at 500kg / h, and the adsorbent is continuously added at a speed of 40kg / h through the feeder. In the stirred adsorption tank, the residence time is controlled at 20min. The mixed slurry is separated by a solid-liquid separator for solid-liquid separation. After the mixed slurry is separated by a solid-liquid separator, the separated solid is dried and incinerated. Add polyaluminum sulfate to the obtained supernatant II, and th...

Embodiment 3

[0044] Preparation of the adsorbent:

[0045] The lignite is ground by a coal mill to obtain coal powder with a particle size of 1-15 μm. The raw material of diatomite is dried at 120°C and pulverized by high-pressure airflow. Coal powder and diatomaceous earth are ground and mixed in a mass ratio of 9:1.

[0046] Wastewater treatment process:

[0047] After the maleic anhydride emulsified wastewater settles in the settling tank, the COD is 16300, and the dibutyl phthalate content is 0.78% (wt). It is continuously added to the stirring adsorption tank at 500kg / h, and the adsorbent is continuously added at a speed of 40kg / h through the feeder. In the stirred adsorption tank, the residence time is controlled at 20min. The mixed slurry is separated by a solid-liquid separator for solid-liquid separation, and the separated solid is dried and incinerated. Add polyaluminum sulfate to the obtained supernatant II, and the feeding rate is 5g / h (the total amount of flocculant added ...

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Abstract

The invention discloses a continuous pretreatment method of maleic anhydride emulsifying waste water. The continuous pretreatment method comprises the following steps of after the maleic anhydride emulsifying waste water is deposited, delivering a supernatant I into an adsorption tank, adding an adsorbent, stirring for absorption, then carrying out solid-liquid separation, and carrying out drying and incinerating treatment on deposits obtained through the solid-liquid separation; adding a flocculating agent to a supernatant II obtained through the solid-liquid separation, adding an oxidizing agent to a supernatant III obtained through the solid-liquid separation after flocculating deposition, and delivering a supernatant IV obtained through oxidizing reaction into a biochemical treatment unit; returning lower deposited residues which are respectively obtained after the flocculating deposition and the oxidizing reaction into the adsorption tank to participate in a next period of adsorption separation. According to the continuous pretreatment method, high-oil content emulsifying waste water generated in a process for preparing maleic anhydride through a normal butane oxidation method is pretreated, the COD of pretreated waste water is obviously reduced, and phthalate is reduced to be less than 20 ppm, so that low toxicity on microbes and less foaming are achieved, and the requirement for subsequent biochemical method treatment is met.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater, in particular to a continuous pretreatment method for emulsified wastewater produced from maleic anhydride. Background technique [0002] Maleic anhydride is a commonly used important basic organic chemical raw material, and the oxidation of maleic anhydride with n-butane is one of the main production methods. n-butane at V 2 o 5 -P 2 o 5 A gas-phase oxidation reaction occurs under the action of a catalyst to generate oxidation by-products such as maleic anhydride, carbon dioxide, carbon monoxide, organic acids (such as acetic acid, acrylic acid, maleic acid, fumaric acid) and water. The produced gas phase adopts dibutyl phthalate (lean oil) to absorb maleic anhydride to become rich oil, and the rich oil is stripped to release maleic anhydride to become lean oil for recycling. In order to reduce the accumulation of reaction by-products in the lean oil and affect the adsorption ...

Claims

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Application Information

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IPC IPC(8): C02F9/14
CPCC02F1/281C02F1/5245C02F1/722C02F9/00C02F2101/34C02F2103/36C02F2301/08
Inventor 秦振宝施孟华
Owner ZHEJIANG QICAI ECO TECH CO LTD
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