Naphthenic amide dephenolizing extractant and application thereof

Abstract

The invention relates to a naphthenic amide dephenolizing extractant and application thereof. The dephenolizing extractant comprises the following raw materials in percentage by volume: 5-10% of naphthenic amide, 10-20% of cosolvent and the balance of diluent. Compared with the prior art, the method has the beneficial effects that the mixture of naphthenic amide, the lipid cosolvent and kerosene is selected as the extraction agent, and the preparation method is simple and easy to operate. The extraction agent is high in distribution coefficient, high in extraction rate (98% or above), small inloss, applicable to high-concentration phenol-containing wastewater, wide in applicable water pH range, low in water solubility, easy to recycle and reusable. The preparation cost is low, the pungentsmell is small, and secondary pollution is hardly caused.

Description

technical field

[0001] The invention relates to the field of high-concentration phenol-containing wastewater treatment, in particular to a naphthenic amide dephenol extraction agent and its application. Background technique

[0002] The organic matter group in industrial wastewater is extremely complex, among which phenolic organic matter is the most common raw material and intermediate unit product in the coal chemical industry. Due to its wide application range, a large amount of high-concentration phenol-containing wastewater will be produced with the accompanying products. If the accumulated capacity exceeds the environmental background threshold, it will cause irreparable damage to the ecology. Phenolic compounds are more harmful to the human body and have been suspected to be highly carcinogenic poisons. The treatment of phenolic wastewater is costly and difficult, so the treatment and recycling of this kind of wastewater has always been the focus of industrial wastew...

Examples

Embodiment 1

[0043] The volatile phenol content of the raw water of a coal gasification wastewater is 5682mg / L, the pH value is 8.32, the pH value of the wastewater is adjusted to 7, the ratio of wastewater to extraction agent is 4:1, it enters the extraction device, the reaction temperature is room temperature, and it undergoes two-stage extraction. The phenol-containing extract phase is added with 8% NaOH solution, the ratio of the extract phase to the lye is 4:1, the extractant is separated and recovered in the stripping device, the reaction temperature is 55°C, and the stripping is carried out in three stages. The volatile phenol content of the treated water sample was determined to be 33.14 mg / L, the removal rate was 99.1%, and the recovery rate of the extractant was 99.97%.

Embodiment 2

[0045] The volatile phenol content of the raw water of a blue charcoal wastewater is 4711mg / L, the pH value is 8.55, the pH value of the wastewater is adjusted to 7, the ratio of wastewater to extraction agent is 5:1, and it enters the extraction device, the reaction temperature is room temperature, and it undergoes two-stage extraction. The phenol-containing extract phase is added with NaOH solution with a mass concentration of 8%, the ratio of the extract phase to the lye is 4:1, the extractant is separated and recovered in the stripping device, the reaction temperature is 45°C, and three stages of stripping are performed. The volatile phenol content of the treated water sample was determined to be 61.24mg / L, the removal rate was 98.7%, and the recovery rate of the extractant was 99.98%.

Embodiment 3

[0047] The volatile phenol content of the wastewater produced by a needle coke project is 12596mg / L, the pH value is 8.28, the pH of the wastewater is adjusted to 5, the ratio of wastewater to extraction agent is 2:1, the extraction device, the reaction temperature is room temperature, and three stages of extraction . The phenol-containing extract phase is added with 8% NaOH solution, the ratio of the extract phase to the lye is 4:1, the extractant is separated and recovered in the stripping device, the reaction temperature is 55°C, and the stripping is carried out in three stages. The volatile phenol content of the treated water sample was determined to be 239.32 mg / L, the removal rate was 98.1%, and the recovery rate of the extractant was 99.96%.

technical field

[0001] The invention relates to the field of high-concentration phenol-containing wastewater treatment, in particular to a naphthenic amide dephenol extraction agent and its application. Background technique

[0002] The organic matter group in industrial wastewater is extremely complex, among which phenolic organic matter is the most common raw material and intermediate unit product in the coal chemical industry. Due to its wide application range, a large amount of high-concentration phenol-containing wastewater will be produced with the accompanying products. If the accumulated capacity exceeds the environmental background threshold, it will cause irreparable damage to the ecology. Phenolic compounds are more harmful to the human body and have been suspected to be highly carcinogenic poisons. The treatment of phenolic wastewater is costly and difficult, so the treatment and recycling of this kind of wastewater has always been the focus of industrial wastew...

Examples

Embodiment 1

[0043] The volatile phenol content of the raw water of a coal gasification wastewater is 5682mg / L, the pH value is 8.32, the pH value of the wastewater is adjusted to 7, the ratio of wastewater to extraction agent is 4:1, it enters the extraction device, the reaction temperature is room temperature, and it undergoes two-stage extraction. The phenol-containing extract phase is added with 8% NaOH solution, the ratio of the extract phase to the lye is 4:1, the extractant is separated and recovered in the stripping device, the reaction temperature is 55°C, and the stripping is carried out in three stages. The volatile phenol content of the treated water sample was determined to be 33.14 mg / L, the removal rate was 99.1%, and the recovery rate of the extractant was 99.97%.

Embodiment 2

[0045] The volatile phenol content of the raw water of a blue charcoal wastewater is 4711mg / L, the pH value is 8.55, the pH value of the wastewater is adjusted to 7, the ratio of wastewater to extraction agent is 5:1, and it enters the extraction device, the reaction temperature is room temperature, and it undergoes two-stage extraction. The phenol-containing extract phase is added with NaOH solution with a mass concentration of 8%, the ratio of the extract phase to the lye is 4:1, the extractant is separated and recovered in the stripping device, the reaction temperature is 45°C, and three stages of stripping are performed. The volatile phenol content of the treated water sample was determined to be 61.24mg / L, the removal rate was 98.7%, and the recovery rate of the extractant was 99.98%.

Embodiment 3

[0047] The volatile phenol content of the wastewater produced by a needle coke project is 12596mg / L, the pH value is 8.28, the pH of the wastewater is adjusted to 5, the ratio of wastewater to extraction agent is 2:1, the extraction device, the reaction temperature is room temperature, and three stages of extraction . The phenol-containing extract phase is added with 8% NaOH solution, the ratio of the extract phase to the lye is 4:1, the extractant is separated and recovered in the stripping device, the reaction temperature is 55°C, and the stripping is carried out in three stages. The volatile phenol content of the treated water sample was determined to be 239.32 mg / L, the removal rate was 98.1%, and the recovery rate of the extractant was 99.96%.

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