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Method for separating and recovering crystallized phenol from phenol-containing dilute solution

A technology for separation and recovery of dilute solutions, applied in chemical instruments and methods, preparation of organic compounds, water pollutants, etc., can solve the problems of high energy consumption, high cost, secondary pollution, etc., achieve high separation efficiency, eliminate secondary pollution, etc. The effects of secondary pollution and low cost of wastewater treatment

Active Publication Date: 2012-12-12
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to treat low-concentration phenol wastewater or to directly recover high-purity crystalline phenol from phenol-containing dilute solutions or wastewater, so as to solve the existing problems of complex process for treating phenol-containing wastewater, high energy consumption and high cost, and easy secondary pollution. , and then proposed a method of separating phenol in dilute solution by using pervaporation technology and directly recovering crystalline phenol, so as to realize the energy saving and emission reduction of phenol-containing wastewater and the resource recovery of phenol

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] 1 L of phenol solution with a concentration of 6000 ppm was placed in a three-necked flask and heated to 70 oC by an electric heating mantle, and the solution was circulated into a small-scale pervaporation membrane separation device with a pump. The phenol vapor passing through the membrane is continuously pumped in, and stainless steel wire mesh filler is added to the phenol collector, and the collector is immersed in liquid nitrogen to cool, and the vacuum in the collector is kept below 1 mbar. After 4 hours of continuous operation, the phenol collector is taken out. After standing at room temperature for 15 min, the wire mesh filler was taken out. White crystals of pure phenol were distributed on the surface of the filler, and 2.2 g of crystalline phenol could be obtained after collection.

Embodiment 2

[0011] Put 1.5 L of phenol solution with a concentration of 3000 ppm in a three-necked flask and heat it to 80 oC through an electric heating mantle, and pump the solution into a small-scale pervaporation membrane separation device. The phenol vapor passing through the membrane is continuously pumped in, and stainless steel wire mesh filler is added to the phenol collector, and the collector is immersed in liquid nitrogen to cool, and the vacuum in the collector is kept below 1 mbar. After continuous operation for 6 hours, the phenol collector is taken out. After standing at room temperature for 20 min, the wire mesh filler was taken out. White crystals of pure phenol were distributed on the surface of the filler, and 1.8 g of crystalline phenol could be obtained after collection.

Embodiment 3

[0013] Put 1.0 L of phenol solution with a concentration of 5000 ppm in a three-necked flask and heat it to 60 oC through an electric heating mantle, and pump the solution into a small-scale pervaporation membrane separation device. The phenol vapor passing through the membrane is continuously pumped in, and stainless steel wire mesh filler is added to the phenol collector, and the collector is immersed in liquid nitrogen to cool, and the vacuum in the collector is kept below 1 mbar. After continuous operation for 6 hours, the phenol collector is taken out. After standing at room temperature for 15 min, the wire mesh filler was taken out. White crystals of pure phenol were distributed on the surface of the filler, and 1.2 g of crystalline phenol could be obtained after collection.

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PUM

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Abstract

A method for separating and recovering crystallized phenol from a phenol-containing dilute solution comprises the following steps: circulating and introducing low-concentration phenol waste water or a solution into a pervaporation device, enriching phenol steam into a low-vacuum phenol collector cooled by liquid nitrogen by using a pervaporation membrane with excellent selectivity to phenol, adding a metal wire mesh filler into the collector as a substrate for phenol crystallization. The invention can be used for treatment of waste water containing low-concentration phenol and can recover crystallized phenol; no chemical reagent is needed to be added, which eliminates secondary pollution; the invention realizes energy saving, emission reduction and resource recovery of waste water, and isenvironment-friendly high-efficient separation technology.

Description

technical field [0001] The invention relates to a method for treating a solution containing low-concentration phenol by using pervaporation membrane separation technology, especially a method capable of directly recovering and obtaining crystalline pure phenol. Background technique [0002] Phenol is an important raw material in the pharmaceutical, plastic, petrochemical and pesticide industries, and is also a common pollutant in industrial wastewater produced by petrochemical, petroleum refining, phenolic resin, coal conversion and pesticide industries. Because phenol is highly toxic and difficult to biodegrade, the treatment of industrial phenol-containing wastewater and the effective recovery of phenol in dilute solutions have always been important topics in the field of environmental pollution. [0003] Existing phenol-containing wastewater treatment technologies such as catalytic oxidation (such as Chinese patent ZL02144567.2, CN1017987B) and biological methods (such as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/44C07C39/04C07C37/84C02F101/34
Inventor 郝晓刚侯红串王忠德张忠林樊彩梅刘世斌梁镇海
Owner TAIYUAN UNIV OF TECH
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