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Pressure-swing distillation and separation method for phenol wastewater

A technology of low-pressure rectification and high-pressure rectification tower, applied in chemical instruments and methods, water pollutants, multi-stage water treatment, etc., can solve problems such as unsatisfactory results, and achieve the effect of avoiding secondary pollution

Inactive Publication Date: 2017-09-26
QINGDAO UNIV OF SCI & TECH
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Problems solved by technology

The phenol-water mixture is divided into water phase and organic phase below 65.3°C, but at 35°C, the phenol content in the water phase is 9.22g / 100g, and the effect of heterogeneous azeotropic distillation without entrainer is not good. ideal

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  • Pressure-swing distillation and separation method for phenol wastewater

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specific Embodiment approach

[0014] The specific embodiment: the method of carrying out phenol recovery and processing into waste water with high concentration of phenol is that the treatment method is as follows:

[0015] The raw material liquid 1 is sent into the high-pressure rectification tower 2 at 5000 kg / h, and the raw material composition is: an aqueous solution containing 8-10% phenol.

[0016] The operating pressure of the high-pressure rectification tower 2 is 1410-1430kPa, the reflux ratio is 0-2, the temperature of the tower bottom is 195-197°C, and the number of theoretical plates is 50-60. An aqueous solution containing 28%-32% of phenol is obtained at the top of the tower, and the output 3 from the tower bottom is 4504 kg / h of phenol aqueous solution with a content of less than 0.1%.

[0017] The top steam 4 is cooled by the condenser 5, and part of it is refluxed through the stream 6, and the other part is sent into the low-pressure rectification column 8 through the stream 7 at 2575 kg / h...

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Abstract

The invention provides a method for recycling phenol from high-concentration phenol wastewater and converting the high-concentration phenol wastewater into low-concentration phenol wastewater. The method for treating the phenol wastewater mainly includes: feeding the phenol wastewater into a high-pressure rectifying tower, allowing tower-top distillate to enter a low-pressure rectifying tower, and acquiring the low-concentration phenol wastewater easy in biochemical treatment through a tower reactor; allowing the tower-top distillate of the low-pressure rectifying tower to return the high-pressure rectifying tower, and acquiring recycled phenol through a tower reactor. The method is large in treatment quantity, simple and reasonable in treatment flow, convenient to operate, good in treatment effect, free of secondary pollution and capable of avoiding the waste of a large amount of phenol.

Description

technical field [0001] The patent of the present invention provides a method for recovering phenol from high-concentration phenol wastewater and converting it into low-concentration phenol wastewater that is easy to biochemically treat, mainly involving the pressure swing rectification process of low-pressure rectification tower and high-pressure rectification tower. Background technique [0002] Phenol is an important chemical raw material or intermediate. It is used in bisphenol A, phenol hydroxylation co-production o / hydroquinone, phenol acetone plant, phenolic resin production and coal gasification process. Due to technological reasons, it will be used in production A phenol-water mixture or phenol-containing wastewater appears during the process. Phenolic compounds are a class of highly toxic and refractory organic compounds. GB8978-2002 "Integrated Wastewater Discharge Standard" stipulates that the emission concentration of volatile phenols should not exceed 0.5mg / l. ...

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Application Information

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IPC IPC(8): C07C37/78C07C39/04C02F1/04C02F101/34
CPCC02F1/048C07C37/78C02F2301/08C02F2101/345C07C39/04
Inventor 张俊梅王磊李韶璞仲广民段振亚
Owner QINGDAO UNIV OF SCI & TECH