Process for treating industrial waste water containing hydroxybenzene and ammine by double-tower stripping

Abstract

A method for treating wastewater with phenol and ammonia coal from chemical industry by double-tower steam stripping is disclosed. The steps of the technical method of the invention are as follows: 1. acidic gases are deacidified; 2. amino is removed; 3. ammonia is concentrated and purified. The invention has the advantages that: 1. by the method of the invention, acidic gases and ammonia can be removed comparatively thoroughly, residual quantity of the acidic gases can be reduced to be below 10mg / L and the total amount of ammonia can be reduced to below 10mg / L, thereby avoiding the resistance function of the ammonia to the follow-up biochemical section; 2. the method of the invention can greatly improve the desorption rate of phenol or decrease the operation cost of the extraction section; 3. the method of the invention can effectively separate volatile phenol from ammonia, and the content of the volatile phenol and the acidic gases can be decreased to below 10mg / L, thus lightening the energy consumption and purifying load in the follow-up ammonia refining process; 4. the concentration of the ammonia can be improved to over 98 percent; 5. the method can effectively remove oil contaminants with low boiling point.

Description

technical field

[0001] The invention relates to a method for treating coal chemical wastewater, in particular to a method for treating phenolic and ammonia-containing coal chemical wastewater by double-tower stripping. Background technique

[0002] my country is a big coal country. With the increasing shortage of petroleum resources, the development of coal chemical industries such as coal-to-oil and coal-to-gas is in the ascendant, and serious environmental pollution problems follow. During the process of coal gasification and coking, a large amount of highly polluted wastewater is produced, containing high concentrations of pollutants such as phenol, ammonia, and acid gas. For this type of wastewater, chemical separation process must be adopted to separate out most of the phenol, ammonia and acid gas before entering the subsequent biochemical treatment.

[0003] At present, there are more or less problems in the following aspects in the process and technology of coal chem...

Examples

Embodiment 1

[0015] (1) Let the phenolic and ammonia-containing coal chemical wastewater enter into the tower from the upper part and middle upper part of the deacidification tower drawn out from the side line in two streams, cold and hot, so that the pressure at the top of the tower is 0.2 MPa (a), the temperature is 40 ° C, and the bottom of the tower is The pressure is 0.255Mpa(a), and the temperature is 120°C. The acid gas is stripped from the top of the tower, and according to the composition, it can enter the sulfur recovery unit, be incinerated by torch or be vented directly, and the still liquid is extracted from the bottom of the tower;

[0016] (2) The waste water from the removal of acid gas enters the deamination tower from the middle and upper part, the pressure at the top of the tower is 0.2-Mpa(a), the temperature is 40°C, the pressure at the bottom of the tower is 0.25Mpa(a), and the temperature is 120°C. Ammonia-water vapor containing 5% ammonia is stripped from the top of...

Embodiment 2

[0021] (1) Let the phenolic and ammonia-containing coal chemical wastewater enter into the tower from the upper part and middle upper part of the deacidification tower drawn out from the side line in two streams, cold and hot, so that the pressure at the top of the tower is 0.7MPa (a), the temperature is 80 °C, and the bottom of the tower is The pressure is 0.75Mpa(a), and the temperature is 170°C. The acid gas is stripped from the top of the tower, and depending on the composition, it can enter the sulfur recovery unit, be flared or directly vented. Extract the still liquid from the bottom of the tower;

[0022] (2) The waste water from the removal of acid gas enters the deamination tower from the middle and upper part, the pressure at the top of the tower is 0.7Mpa(a), the temperature is 80°C, the pressure at the bottom of the tower is 0.75Mpa(a), and the temperature is 170°C. Ammonia-water vapor containing 10% ammonia is stripped from the top of the tower. Extract the sti...

technical field

[0001] The invention relates to a method for treating coal chemical wastewater, in particular to a method for treating phenolic and ammonia-containing coal chemical wastewater by double-tower stripping. Background technique

[0002] my country is a big coal country. With the increasing shortage of petroleum resources, the development of coal chemical industries such as coal-to-oil and coal-to-gas is in the ascendant, and serious environmental pollution problems follow. During the process of coal gasification and coking, a large amount of highly polluted wastewater is produced, containing high concentrations of pollutants such as phenol, ammonia, and acid gas. For this type of wastewater, chemical separation process must be adopted to separate out most of the phenol, ammonia and acid gas before entering the subsequent biochemical treatment.

[0003] At present, there are more or less problems in the following aspects in the process and technology of coal chem...

Examples

Embodiment 1

[0015] (1) Let the phenolic and ammonia-containing coal chemical wastewater enter into the tower from the upper part and middle upper part of the deacidification tower drawn out from the side line in two streams, cold and hot, so that the pressure at the top of the tower is 0.2 MPa (a), the temperature is 40 ° C, and the bottom of the tower is The pressure is 0.255Mpa(a), and the temperature is 120°C. The acid gas is stripped from the top of the tower, and according to the composition, it can enter the sulfur recovery unit, be incinerated by torch or be vented directly, and the still liquid is extracted from the bottom of the tower;

[0016] (2) The waste water from the removal of acid gas enters the deamination tower from the middle and upper part, the pressure at the top of the tower is 0.2-Mpa(a), the temperature is 40°C, the pressure at the bottom of the tower is 0.25Mpa(a), and the temperature is 120°C. Ammonia-water vapor containing 5% ammonia is stripped from the top of...

Embodiment 2

[0021] (1) Let the phenolic and ammonia-containing coal chemical wastewater enter into the tower from the upper part and middle upper part of the deacidification tower drawn out from the side line in two streams, cold and hot, so that the pressure at the top of the tower is 0.7MPa (a), the temperature is 80 °C, and the bottom of the tower is The pressure is 0.75Mpa(a), and the temperature is 170°C. The acid gas is stripped from the top of the tower, and depending on the composition, it can enter the sulfur recovery unit, be flared or directly vented. Extract the still liquid from the bottom of the tower;

[0022] (2) The waste water from the removal of acid gas enters the deamination tower from the middle and upper part, the pressure at the top of the tower is 0.7Mpa(a), the temperature is 80°C, the pressure at the bottom of the tower is 0.75Mpa(a), and the temperature is 170°C. Ammonia-water vapor containing 10% ammonia is stripped from the top of the tower. Extract the sti...

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