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Method for reducing content of organic matters in TCPP production wastewater

A technology for the production of wastewater and organic matter, applied in the direction of separation methods, water pollutants, chemical instruments and methods, etc., can solve the problems of complex process, increase of water treatment cost, increase of drug dosage, etc., achieve simple and convenient process, reduce difficulty, and effect significant effect

Active Publication Date: 2020-11-06
扬州晨化新材料股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The above treatment methods may use direct drug addition, additional system components, increased drug dosage; or use graphene, oscillators, fiber membranes, photocatalytic reactors, etc. Machines or consumables; or the use of non-reusable reagents, etc., the process is more complicated, and there is no simple method to purify and separate organic matter in wastewater in advance, which greatly increases the cost of later water treatment

Method used

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  • Method for reducing content of organic matters in TCPP production wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Put 1t of solvent xylene and 3t of waste water produced by phosphorus-based flame retardant TCPP into the reaction kettle, stir for 3 hours at a temperature of 40-45°C, and control the stirring speed at 250r / min. After the stirring was completed, the temperature was lowered to below 30° C., and the mixture was allowed to stand for 10 hours, separated into layers, and the lower aqueous phase and the upper organic phase were treated separately.

[0031] The upper organic phase is recycled. The specific method is: put the organic phase into the recovery kettle, raise the temperature and stir, keep the temperature at 100-110°C, and distill under reduced pressure at a vacuum of -0.095--0.1MPa to recover 996kg of solvent by distillation. The rate is 99.6%, and the solvent is recycled after recovery. The recovered organic matter was 14.7kg, accounting for 4.9‰ in the wastewater, and entered the washing step of the next batch of TCPP as a crude product.

[0032] The lower aque...

Embodiment 2

[0034] Put 500kg of solvent xylene and 2t of waste water from the production of phosphorus-based flame retardant TCPP into the reaction kettle, stir for 4 hours at a temperature of 45-50°C, and control the stirring speed to 400r / min. After the stirring was completed, the temperature was lowered to below 30° C., and the mixture was left to stand for 12 hours to separate layers, and the lower aqueous phase and the upper organic phase were treated separately.

[0035] The upper organic phase is recycled. The specific method is: put the organic phase into the recovery kettle, heat up and stir, keep the temperature at 100-110°C, and distill under reduced pressure at a vacuum of -0.095--0.1MPa to recover 493kg of solvent by distillation. The rate is 98.6%, and the solvent is recycled after recovery. 10.3kg of organic matter remained in the recovery kettle, accounting for 5.15‰ in the waste water, and entered the washing process of TCPP as a crude product.

[0036] The lower aqueous...

Embodiment 3

[0038] Put 400kg of solvent toluene and 2t of phosphorus-based flame retardant TCPP production wastewater into the reaction kettle, stir for 5 hours at a temperature of 60-65°C, and control the stirring speed to 400r / min. After the stirring was completed, the temperature was lowered to below 30° C., and the mixture was left to stand for 15 hours to separate layers, and the lower aqueous phase and the upper organic phase were treated separately.

[0039] The upper organic phase is recycled. The specific method is: put the organic phase into the recovery kettle, heat up and stir, keep the temperature at 100-110°C, and distill under reduced pressure at a vacuum of -0.095--0.1MPa to recover 395kg of solvent by distillation. The recovery rate is 98.75%, and the solvent is recycled after recovery. The residual organic matter in the recovery kettle is 9.9kg, accounting for 4.95‰ in the wastewater. The recovered crude product enters the washing process of TCPP.

[0040] The lower aque...

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Abstract

The invention provides a method for reducing the content of organic matters in TCPP production wastewater, and relates to the technical field of wastewater treatment. The method comprises the following steps: mixing a solvent and TCPP production wastewater, stirring at 40-90 DEG C for 3-7 hours, cooling to below 30 DEG C, standing, and layering to respectively obtain a lower-layer water phase andan upper-layer organic phase; and carrying out anaerobic and aerobic biochemical treatment on the lower-layer water phase to obtain a water body conforming to discharge; stirring the upper-layer organic phase, heating to 100-110 DEG C, carrying out reduced pressure distillation under the vacuum degree of-0.095 MPa to-0.1 MPa to recover the solvent, recycling the recovered solvent, and taking the residue as a crude product to enter a TCPP washing process. The method is simple and can reduce the content of organic matters in the phosphorus flame retardant TCPP production wastewater.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for treating wastewater produced by phosphorus-based flame retardants. Background technique [0002] TCPP, full name tris(2-chloropropyl) phosphate, is an additive low molecular weight halogen phosphorus flame retardant, which has unique properties such as flame retardant, plasticizing, antistatic, etc., and is a cost-effective fine Chemical products, mainly used in flame retardant of polyvinyl chloride, polystyrene, phenolic resin, acrylic resin, rubber and paint, also widely used in polyurethane soft foam, hard foam and plastic products. [0003] The process commonly used by TCPP is: under the action of an acid catalyst, react propylene oxide and phosphorus oxychloride to obtain a crude product, add alkali, wash the crude product, and vacuum dehydrate to obtain a TCPP product. Since the washing process in the TCPP production process uses a large amount of...

Claims

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Application Information

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IPC IPC(8): C02F1/04C02F1/40C02F3/30C02F101/34C02F101/36
CPCC02F1/40C02F1/046C02F3/30C02F2101/34C02F2101/36
Inventor 张云房连顺董晓红贾正仁王雨陆国玲
Owner 扬州晨化新材料股份有限公司
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