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Treatment method of hexa-phenoxy-cyclotriphosphazene industrial wastewater

A technology of hexaphenoxycyclotriphosphazene and industrial wastewater, which is applied in chemical instruments and methods, preparation of organic compounds, purification of alkali metal halides, etc., can solve the problem of high treatment cost, achieve COD value reduction, and significantly economical Effects of benefits and environmental benefits

Active Publication Date: 2018-09-04
MIANYANG TEACHERS COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the wastewater in the form of sodium phenate, it is necessary to add acid to convert it into phenol before extraction. After extraction, add a stripping agent to convert the phenol into sodium phenate and remove it. In addition, the more expensive special extraction agent, and procedures such as oil-water separation, etc., the treatment cost is too high high

Method used

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  • Treatment method of hexa-phenoxy-cyclotriphosphazene industrial wastewater
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  • Treatment method of hexa-phenoxy-cyclotriphosphazene industrial wastewater

Examples

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Effect test

Embodiment 1

[0028] like figure 1 As shown, the treatment method of hexaphenoxy cyclotriphosphazene industrial wastewater of the present invention comprises the following steps:

[0029] (1) Weigh 300g of waste water and place it in a flask, transfer it to a decompression evaporation device for evaporative crystallization, the degree of vacuum is -90KPa, the initial heating temperature is 65°C, and when the condensate water outlet speed becomes slower and the boiling weakens, the temperature is gradually increased. To 90 ℃, when the waste water evaporates 80% to 90% of its total water, stop heating, take out the solid-liquid mixture after cooling, about 110g;

[0030] (2) in above-mentioned solid-liquid mixture, add 150mL ethanol, dissolve sodium phenate, suction filter, and wash with 50mL ethanol, obtain sodium chloride white crystal after drying, quality is 61.4g, the SEM photo of described sodium chloride and energy The spectral analysis results are as figure 2 and 3 shown;

[0031...

Embodiment 2

[0034] (1) Weigh 300g of waste water and place it in a flask, transfer it to a decompression evaporation device for evaporative crystallization, the degree of vacuum is -80KPa, and the initial heating temperature is 65°C. When the speed of condensate water discharge becomes slow and the boiling is weakened, the temperature is gradually increased. To 90 ℃, when the waste water evaporates 80% to 90% of its total water, stop heating, take out the solid-liquid mixture after cooling, about 110g;

[0035] (2) adding 150 mL of methanol to the above-mentioned solid-liquid mixture, dissolving sodium phenate, suction filtration, and washing with 50 mL of methanol, after drying, a white crystal of sodium chloride was obtained, the quality was 60.2 g, and the purity was 98%;

[0036] (3) the above-mentioned filtrate containing sodium phenolate is transferred into the decompression evaporation device to carry out evaporative concentration, vacuum tightness is -80~-90Kpa, initial heating tem...

Embodiment 3

[0039] Adopt the same steps as steps (1) to (3) in Example 1 to prepare the crude sodium phenolate, and measure the mass fraction of sodium phenolate in the crude sodium phenolate by ultraviolet spectrophotometry at a wavelength of 290 nm to be 55%, take 30 g The crude sodium phenate was added with 9 mL of deionized water, heated to 70 °C to dissolve, and when it was cooled to 30 to 35 °C at room temperature, sodium phenolate trihydrate seeds were added, and crystals began to separate out. After 30 minutes, transfer to a refrigerator for crystallization at -5 °C , 12h later, prismatic white sodium phenolate crystals were obtained, and the composition of the crystals was sodium phenolate trihydrate, the mass was 16.3g, and the purity was 97% by ultraviolet spectroscopic analysis and detection.

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Abstract

The invention discloses a treatment method of hexa-phenoxy-cyclotriphosphazene industrial wastewater. The treatment method comprises the following steps: heating and evaporating the hexa-phenoxy-cyclotriphosphazene industrial wastewater to obtain a solid-liquid mixture; adding an organic solvent to the solid-liquid mixture for dissolving sodium phenolate; performing solid-liquid separation, washing and drying to obtain a sodium chloride crystal; heating and evaporating the sodium phenolate-containing solution obtained by the solid-liquid separation to obtain a sodium phenolate concentrated solution; adding deionized water or crystallization mother liquor into the sodium phenolate concentrated solution, heating to dissolve, cooling, adding seed crystals for crystallization, and obtaining asodium phenolate trihydrate crystal through separation; and the crystallization mother liquor is mother liquor after the crystallization of sodium phenolate. The treatment method can effectively recover the sodium phenolate and sodium chloride in waste water; the obtained sodium phenolate and the sodium chloride have relatively high purity and can be recycled; and the treatment method can also significantly reduce the COD value of the waste water, and has significant economic and environmental benefits.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to a method for treating hexaphenoxycyclotriphosphazene industrial wastewater. Background technique [0002] Hexaphenoxycyclotriphosphazene is a halogen-free flame retardant with excellent performance and environmental friendliness. It is widely used in PC, PC / ABS resin, PPO, nylon and other products, and is widely used in plasticizers and lubricants. additives and auxiliaries. [0003] Hexaphenoxy cyclotriphosphazene is usually prepared by reacting hexachlorocyclotriphosphazene with sodium phenolate. In industrial production, in order to ensure the sufficient reaction of hexachlorocyclotriphosphazene and obtain a higher yield, sodium phenate needs If the excess is about 5%, the post-treatment of the product is to use water washing and recrystallization to obtain relatively pure hexaphenoxy cyclotriphosphazene. The wastewater generated in the production mai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C39/235C07C37/84C01D3/14
CPCC01D3/14C07C37/84C07C39/235
Inventor 黎国兰李松陈彦君贺礼青李昭伦
Owner MIANYANG TEACHERS COLLEGE
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