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Energy-saving method for recycling wastewater containing phenol and ammonia

A treatment method and wastewater recycling technology, which is applied in the directions of heating water/sewage treatment, degassed water/sewage treatment, extraction water/sewage treatment, etc., can solve the problem of high energy consumption, reduce capacity consumption, save consumption, and realize step-by-step The effect of comprehensive utilization

Inactive Publication Date: 2012-08-22
TIANJIN HAOYONG CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention solves the technical problem of high energy consumption in the recovery and utilization of phenol and ammonia wastewater in the process of coal gasification, and invents a new wastewater treatment process that simultaneously recovers phenol and ammonia

Method used

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  • Energy-saving method for recycling wastewater containing phenol and ammonia
  • Energy-saving method for recycling wastewater containing phenol and ammonia

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] (1) After the 75t / h waste water is transported from the gas-water separator, the suspended solids, tar and light oil are removed, the temperature is 40°C, and the pressure is 1.0MPa. The concentration is 5 g / L of phenol, 8.5 g / L of ammonia, 2.55 g / L of carbon dioxide, and 0.155 g / L of hydrogen sulfide.

[0062] (2) The phenol ammonia-containing wastewater coming over is divided into two streams: one stream directly enters the top of the tower at 20 t / h; the other stream is heated to 85° C. through the preheater 2 (13) and enters the middle of the deacidification tower (1).

[0063] (3) The deacidification tower is a plate tower. The operating pressure of the deacidification tower is 30kPa (gauge pressure), the temperature at the top of the tower is 40°C, and the bottom of the tower is 110°C. The bottom of the tower is heated by a reboiler (2), and the heat source is the heat released by the condensation of the crude gas at the top of the deamination tower (9). The cond...

example 1

[0071] (1) The ammonia concentration in the wastewater after deammonification is 100 mg / L.

[0072] (2) The mass concentration of ammonia water at the bottom of the ammonia concentration tower is 10%, and the ammonia concentration in the tail gas is 50 mg / m3.

[0073] (3) The mass concentration of the crude phenol product is 99%.

[0074] (4) The solvent consumption is 1.5kg / t waste water.

[0075] (5) The content of phenol in the treated wastewater is 250 mg / L

[0076] (6) The steam consumption of the device is 180kg steam / t waste water.

Embodiment 3

[0078]

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Abstract

The invention relates to a method for treating wastewater containing phenol and ammonia, in particular to an energy-saving process for recycling the wastewater containing the phenol and the ammonia. Equipment among an acid removing tower, an ammonia removing tower and a water tower is coupled, namely a crude ammonia condenser on the top of the ammonia removing tower is taken as a reboiler of the acid removing tower and the water tower; and a differential pressure rectification technology is utilized, so that the step comprehensive utilization of a heat resource is realized, the energy consumption of wastewater treatment is reduced, and the using amount of steam and circulating water is greatly saved; particularly the equipment is coupled, the differential pressure rectification technologyis utilized and the ammonia and the phenol in the coal gasification wastewater are recycled simultaneously, so that the aims of saving energy and reducing emission in the wastewater treatment and recycling process are fulfilled. The technical problem that the energy consumption is high when the wastewater containing the phenol and the ammonia is recycled in the coal gasification process is solved; and the comprehensive utilization of energy is realized, and the method is high in social value and economic value.

Description

Technical field: [0001] The invention relates to a treatment method for wastewater containing phenol and ammonia, specifically a method for recovering ammonia and phenol in coal gasification wastewater at the same time through coupling between equipment and using differential pressure rectification technology to achieve wastewater treatment and recycling The purpose of energy saving and consumption reduction in the process. Background technique [0002] Coal gasification technology is an effective method for efficient utilization of coal, and is widely used in industries such as coal-to-natural gas, synthetic ammonia, and methanol. During this process, a large amount of wastewater will be produced, which contains a large amount of suspended solids, tar, light oil, fatty acid, carbon dioxide, hydrogen sulfide, ammonia, phenol, etc., which must be treated before being recycled. [0003] The traditional process for the treatment of phenolic wastewater is deacidification-phenol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/04C02F1/20C02F1/26C01C1/02
CPCY02P20/10
Inventor 张萍
Owner TIANJIN HAOYONG CHEM TECH
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