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Continuous treatment method of 1,4-butanediol (BDO) oxidized wastewater

A technology for oxidizing wastewater and treatment methods, applied in 1 field, to achieve the effect of simple process and energy saving

Active Publication Date: 2015-01-21
SINOPEC YIZHENG CHEM FIBER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is necessary to develop a method that can treat wastewater with high COD and high content of phthalates to solve the problem of BDO oxidation wastewater treatment

Method used

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  • Continuous treatment method of 1,4-butanediol (BDO) oxidized wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: The BDO oxidation wastewater 13 to be treated has a COD value of 21,000 and a dibutyl phthalate content of 0.3% (wt). Waste water 13 is continuously added in the precipitation tank 3 at 8t / hr, and the precipitation agent 11 calcium hydroxide stored in the precipitation agent storage tank 1 is continuously added in the precipitation tank 3 at a speed of 80kg / hr through the feeder 2, and the pH in the precipitation tank 3 is controlled From 8 to 12, a small amount of compressed air 12 is continuously introduced for stirring. The resulting precipitated liquid 14 continuously enters the clarification tank 4 for solid-liquid separation, and the clear liquid 15 enters the subsequent homogeneous tank 5, and the treated wastewater is added to adjust the COD value of the incoming water to about 1200, and the adjusted water enters the Anaerobic treatment is carried out in the anaerobic oxidation reactor 6, and the water after the anaerobic treatment enters the aerobic ...

Embodiment 2

[0020] Example 2: roughly the same as Example 1, the difference is: the COD value of the BDO oxidation wastewater to be treated is 24000, the content of dibutyl phthalate is 0.8% (wt), and the precipitant 11 calcium oxide is passed through the feeder 2 It is continuously added to the sedimentation tank 3 at a rate of 120kg / hr. The amount of the precipitant 11 is added so that the pH value of the wastewater 13 is controlled within the range of 9-13, and mechanical stirring is adopted at the same time. The resulting precipitated liquid 14 continuously enters the clarification tank 4 for solid-liquid separation, and the clear liquid 15 enters the subsequent homogeneous tank 5, and adds the treated and discharged wastewater to adjust the COD value of the incoming water to about 800, and the adjusted water enters the Anaerobic treatment is performed in the anaerobic oxidation reactor 6, and the water after the anaerobic treatment enters the aerobic treatment unit 7 for aerobic treat...

Embodiment 3

[0021] Embodiment 3: roughly the same as Example 1, the difference is: the clear liquid 15 that precipitant 11 calcium hydroxide separates solid-liquid with clarifier 4 is mixed with the slurry that mass fraction is 20%, with 600kg / hr speed Continuously added to the sedimentation tank 3. Finally, the COD of the wastewater reaching the discharge standard is 40, and the content of dibutyl phthalate is 0.11ppm.

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Abstract

The invention discloses a continuous treatment method of 1,4-butanediol (BDO) oxidized wastewater, which comprises the following steps: adding a precipitant into BDO oxidized wastewater, and carrying out solid-liquid separation, wherein the precipitant is alkali earth metal oxide or hydroxide; and carrying out anaerobic treatment and aerobic treatment on the clear solution phase obtained by solid-liquid separation, wherein the COD (chemical oxygen demand) value of the treated wastewater is lower than 60, and the phthalate content is less than 0.2 ppm, so the treated wastewater satisfies the discharge requirements. The continuous treatment method can simultaneously lower the COD value and phthalate content of the BDO oxidized wastewater; and after the oxidized wastewater, of which the COD value is higher than 20000 and the phthalate content is higher than 0.1%, is treated by the method, the COD value is less than 60, and the phthalate content is less than 0.2 ppm. The residue after using the precipitant can be subjected to incineration or pyrolysis treatment to obtain metal oxide which can be recovered as the precipitant, thereby saving the energy. The treatment process is simple in technique and performs reaction at normal temperature.

Description

technical field [0001] The invention relates to a method for treating chemical wastewater, in particular to a method for treating 1,4-butanediol oxidation wastewater. Background technique [0002] 1,4-Butanediol (BDO) is the main raw material for the production of polybutylene terephthalate engineering materials. It is often produced by butane oxidative esterification and hydrogenation process, that is, butane is air oxidized into maleic anhydride, maleic anhydride Then it is esterified with methanol to generate dimethyl maleate, and the dimethyl maleate is hydrogenated to generate 1,4-butanediol and tetrahydrofuran. [0003] During the oxidation process, the gas flowing out of the oxidation reactor contains maleic anhydride, unreacted butane, CO, CO2, water and inert gas N2, etc. It is necessary to use a solvent to absorb the maleic anhydride generated by oxidation, and then undergo rectification Process to obtain maleic anhydride products, often using phthalates as absorb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/36
CPCC02F1/5245C02F3/30C02F9/00C02F2103/36
Inventor 张军张忠安束蒙生赵付平李军陈志明秦振宝李晶唐建兴丁大勇
Owner SINOPEC YIZHENG CHEM FIBER