Process for changing phenolic nitrate effluent into useful material by extracting, evaporating, crystallizing and coupling

An evaporation crystallization and recycling technology, applied in evaporation, solution crystallization, extraction water/sewage treatment, etc., can solve the problems of high energy consumption, sodium sulfate treatment, etc., achieve reduced consumption, low treatment and operation costs, and solve the problem of oil-water miscibility Effect

Inactive Publication Date: 2011-11-09
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this process can reduce the phenol content to less than 2 mg / L, it does not treat the sodium sulfate in the sebacic acid production wastewater, and consumes a lot of energy in the process of evaporating high-carbon alcohols

Method used

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  • Process for changing phenolic nitrate effluent into useful material by extracting, evaporating, crystallizing and coupling
  • Process for changing phenolic nitrate effluent into useful material by extracting, evaporating, crystallizing and coupling
  • Process for changing phenolic nitrate effluent into useful material by extracting, evaporating, crystallizing and coupling

Examples

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Effect test

Embodiment 1

[0027] This embodiment uses the treatment process of the present invention to recycle the phenol-containing nitrate solution with the following characteristics: the temperature of the phenol-containing nitrate solution is about 80°C, the pH is about 2, and it is mixed with about 5wt% sebacic acid, The phenol content is 8000mg / L, and the sodium sulfate content is 25wt%.

[0028] Combine below figure 1 The treatment process of the present invention will be described.

[0029] Such as figure 1 Shown is a device for extracting, evaporating, crystallization, coupling, and resource-recovering, phenolic nitrate liquid produced in the production process of sebacic acid in this embodiment, which mainly includes an extraction tower and an evaporative crystallizer. The principle of the whole process is: adjust the pH of the phenol-containing nitrate solution to 3-7, and then enter it from the upper part of the extraction tower 6, and contact with the ricinoleic acid entering the lower part ...

Embodiment 2

[0035] The temperature of the phenol-containing nitrate solution treated in this embodiment is about 70°C, the pH value is about 1.5, mixed with about 5 wt% of sebacic acid, the phenol content is 6000 mg / L, and the sodium sulfate content is 20 wt%.

[0036] In this embodiment, the pH value of the phenol-containing nitrate liquid is adjusted to 7 in the first pH value adjustment tank 2; the reflux ratio of the top of the extraction tower 6 and the bottom of the tower are both 1:1, the temperature of the extraction process is 50°C, the tower The number of plates is 31. The volume ratio of the ricinoleic acid entering the lower part of the extraction tower (6) to the phenol-containing nitrate liquid entering the upper part is 1:20; the dephenolic wastewater discharged from the bottom of the second oil-water separator 8 enters the second pH value In the adjustment tank 9, the pH value is adjusted to 10; the three-effect evaporative crystallizer adopts negative pressure operation, and ...

Embodiment 3

[0040] The temperature of the phenol-containing nitrate solution treated in this embodiment is about 60° C., the pH value is about 1.5, is mixed with about 4 wt% of sebacic acid, the phenol content is 7000 mg / L, and the sodium sulfate content is 18 wt%.

[0041] In this embodiment, the pH value of the phenol-containing nitrate liquid is adjusted to 4 in the first pH value adjustment tank 2; the reflux ratio of the top of the extraction tower 6 and the bottom of the tower are both 1:8, the temperature of the extraction process is 15°C, the tower The number of plates is 36, the volume ratio of the ricinoleic acid entering the lower part of the extraction tower (6) to the phenol-containing nitrate liquid entering the upper part is 1:10; the dephenolic wastewater discharged from the bottom of the second oil-water separator 8 enters the second pH value In the adjustment tank 9, the pH value is adjusted to 8; the three-effect evaporative crystallizer adopts negative pressure operation, ...

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Abstract

The invention discloses a process for changing phenolic nitrate effluent into useful material by extracting, evaporating, crystallizing and coupling, belonging to the field of changing waste water into useful materials. The process comprises the steps of pre-treating waste water, extracting phenol, performing triple effect evaporation and recycling sodium sulfate. Phenol is extracted with ricinoleic acid and is recycled, so the industrial usage of the phenol is decreased. The oil-water mutual solving problem is efficiently solved by utilizing the salting-out effect of the sodium sulfate highly contained in the waste water. By adopting triple effect evaporation of counter-current operation under a basic condition, the phenol is efficiently prevented from secondarily returning into air, so the phenol contained in the treated waste water is less than 0.5mg / l and can be used as the scouring water for preparing process or can be directly discharged. The by-product sodium sulfate solid is efficiently recycled and the purity of the sodium sulfate is above 99.9%. The produced sodium sulfate makes up for the steam consumption during the evaporation process. Furthermore, the process has the advantages of low treating cost, economic benefit and obvious environmental benefit.

Description

Technical field [0001] The invention belongs to the field of waste water resource utilization, and in particular relates to a process for extracting, evaporation, crystallization and resource utilization of phenol-containing nitrate liquid. The process of the present invention is mainly aimed at the resource treatment of high-concentration phenol-containing nitrate solution in the production process of sebacic acid. Background technique [0002] Sebacic acid is an important chemical raw material, which is widely used in the production of low-temperature plasticizers, food fragrances, environmentally friendly products, and medical synthetic materials. There are many methods for preparing sebacic acid, such as cracking, synthesis and hydrolysis. my country is the second largest producer of castor oil in the world. The vast majority of domestic manufacturers use the method of cracking castor oil under alkaline conditions to produce sebacic acid. The process of producing sebacic aci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C55/20C02F9/02C02F1/26C02F1/04B01D9/02B01D1/00C02F103/36
Inventor 徐航周全王光润王金福
Owner TSINGHUA UNIV
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