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Comprehensive utilization method for phosphate flame retardant wastewater

A technology of flame retardant and phosphate ester, which is applied in the field of comprehensive utilization of phosphate ester wastewater and treatment of phosphate ester flame retardant wastewater, can solve the problems of high processing cost and difficulty in industrialization, and achieve the effect of solving cost problems

Active Publication Date: 2015-06-10
ZHENJIANG JIANGNAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the good stability of phosphate esters, it is difficult to destroy the structure of phosphate esters by general oxidation methods; while advanced oxidation technologies such as high-temperature and high-pressure wet catalytic oxidation methods, even if they are theoretically feasible, the treatment costs must be high and difficult to implement. industrialization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 10kg of waste water from TCPP production, after analysis: TP=1500mg / L, COD Cr =10200mg / L, TCPP%≤1%, moisture content 94.5%, pH=7.5, colorless and transparent appearance.

[0025] After pumping the waste water into the preheater for preheating, it enters the sieve plate rectification tower, feeds the material from the tower, conducts continuous rectification, collects samples from the top of the tower and the side of the tower, and stops when the temperature of the tower kettle rises to 125°C. heating. After the kettle liquid was poured out, it was quickly filtered to obtain white square crystals; the kettle liquid continued to cool, crystallize and filter, and the white solid obtained was in the form of white powder after washing and drying. The filtrate is adjusted with 85% phosphoric acid and 40% liquid caustic soda, then enters the directional transformation reactor, reacts at 600°C for 2 hours, and cools to obtain a white loose solid, which is recrystallized a...

Embodiment 2

[0026] Take 10kg of TCEP phosphate ester wastewater, after analysis: TP=1400mg / l, COD Cr =11000mg / l, TCEP%≤1.5%, moisture content 95.1%, pH=8.1, colorless and transparent appearance, heavy ester smell.

[0027] After the waste water is pumped into the preheater for preheating, it is sent to the sieve plate rectification tower, and the feed is fed from the tower for continuous rectification. The samples from the top and side of the tower are collected respectively. When the temperature of the tower kettle rises to 120°C, stop heating. The kettle liquid was poured out and filtered while it was hot to obtain white square crystals; the filtrate was cooled, crystallized and filtered, and the obtained solid was in the form of white powder after washing and drying. The filtrate is adjusted with acid and alkali, then enters the directional conversion reactor, reacts at 650°C for 1.5 hours, and cools to obtain a white flaky solid. After recrystallization and drying, crystalline pyroph...

Embodiment 3

[0029] Take 10kg of TDCPP phosphate wastewater, after analysis: TP=1600mg / l, COD Cr =10000mg / l, TDCPP%≤0.8%, moisture content 95.5%, pH=7.4, colorless and transparent appearance, heavy ester smell.

[0030] After the waste water is pumped into the preheater for preheating, it is sent to the packed rectification tower, and the feed is fed from the tower for continuous rectification. The samples from the top and side of the tower are collected respectively. When the temperature of the tower rises to 128°C, stop heating. The kettle liquid was poured out and filtered while it was hot to obtain white square crystals; the filtrate was cooled, crystallized and filtered, and the solid was washed and dried to become a white powdery solid. The filtrate is adjusted with acid and alkali, then enters the directional transformation reactor, reacts at 850°C for 2 hours, and then cools to obtain a white glassy solid, which is crushed to obtain hexametaphosphate. After analysis, the top of t...

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Abstract

The invention relates to a method for treating phosphate flame retardant wastewater and particularly relates to a comprehensive phosphate flame retardant wastewater utilization method integrating energy-saving rectification-evaporation, oriented conversion and other technologies. The method specifically comprises the following steps: (1) effectively separating wastewater components by adopting a rectification-evaporation technology; (2) converting high-concentration phosphate waste liquor into polyphosphates by adopting an oriented conversion technology, and purifying to obtain the industrial grade polyphosphate product, so that the harmless problem of the phosphate waste liquor is solved; (3) using the water obtained by rectification to produce phosphate flame retardant products, and recycling the water; (4) converting inorganic salt solid wastes into recyclable industrial products by virtue of a fractionation and purification method, so that the discharge problem of the inorganic salt solid wastes is solved; and (5) taking the product as fuel in an oriented conversion process in the basis of the characteristic that the rectified low-boiling-point compound is high in heating value. Therefore, the discharge problem is solved, the energy can be saved, and the wastewater treatment cost is reduced.

Description

technical field [0001] The invention relates to a treatment method for phosphate ester flame retardant waste water, in particular to a comprehensive utilization method for phosphate ester waste water integrating technologies such as energy-saving rectification-evaporation and directional transformation, and the technology belongs to the field of environmental protection. Background technique [0002] Flame retardant is an important additive for synthetic polymer materials. It is currently the second largest plastic additive after plasticizers and has broad market application prospects. Phosphate flame retardants are an important branch in the field of flame retardants. They have long-lasting flame retardant effects, good compatibility with polymer substrates, water resistance, weather resistance, heat resistance and migration resistance, and have become the most important at present. , One of the most widely used types of flame retardants. In addition, most phosphate ester ...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01B25/26
Inventor 王伟周曙光姜胜宝秦龙朱建民赵翀崔小芳佘慧玲吴建年
Owner ZHENJIANG JIANGNAN CHEM
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