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

An evaporative crystallization and resource utilization technology, applied in evaporation, solution crystallization, extraction water/sewage treatment, etc., can solve the problems of sodium sulfate treatment, high energy consumption, etc. Effect

Inactive Publication Date: 2010-02-24
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

Examples

Experimental program
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Effect test

Embodiment 1

[0027] In this embodiment, the treatment process of the present invention is used to recycle the phenol-containing nitric acid liquid with the following characteristics: the temperature of the phenol-containing nitric acid liquid is about 80° C., the pH value is about 2, and about 5wt% of sebacic acid is mixed. 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] like figure 1 Shown is the device used in this embodiment for extracting the phenol-containing nitric acid liquid produced in the production process of coupled sebacic acid by evaporative crystallization, which mainly includes two parts: an extraction tower and an evaporative crystallizer. The principle of the whole process is: adjust the pH value of the phenol-containing nitrate solution to be 3-7, then enter from the upper part of the extraction tower 6, and reversely contact the ricinolei...

Embodiment 2

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

[0036] In the present embodiment, the pH value of the phenol-containing nitrate solution adjusted in the first pH value adjustment tank 2 is 7; The number of plates is 31, and the volume ratio of the ricinoleic acid entering at the bottom of the extraction tower (6) and the phenolic nitric acid solution entered at the top is 1: 20; In the adjustment tank 9, the pH value was adjusted to 10; the three-effect evaporative crystallizer was operated with negative pressure, and the operating absolute pressure was 0.09 MPa; in this implementation, other processes were the same as those in Example 1, except that the above conditions were changed.

[0037] The phenol removal rate of the dephenolized wastewater discharged from the bottom of the seco...

Embodiment 3

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

[0041] In the present embodiment, the pH value of the phenolic nitrate solution adjusted in the first pH value adjusting tank 2 is 4; The number of plates is 36, and the volume ratio of the ricinoleic acid entered at the bottom of the extraction tower (6) and the phenolic nitric acid solution entered at the top is 1: 10; In the adjustment tank 9, the pH value was adjusted to 8; the three-effect evaporation crystallizer was operated with negative pressure, and the operating absolute pressure was 0.01 MPa; in this implementation, other processes were the same as those in Example 1, except that the above conditions were changed.

[0042] The phenol removal rate of the dephenolized wastewater discharged from the bottom of the second oil-water...

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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 highlycontained 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 theadvantages 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 particularly relates to a process for extracting, evaporating, and crystallization coupling to recycle phenol-containing nitrate liquid. The process of the invention is mainly aimed at the resource treatment of high-concentration phenol-containing nitric acid 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 flavors, environmentally friendly products, and medical synthetic materials. There are many preparation methods of sebacic acid, such as cracking method, synthesis method and hydrolysis method. my country is the second largest producer of castor oil in the world. Most domestic manufacturers use the method of cracking castor oil to produce sebacic acid under alkaline conditions. The process flow of the cracking meth...

Claims

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Application Information

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