Treatment method and system of cyanogens-containing organic waste gas

A treatment method, a technology for organic waste gas, applied in the direction of gas treatment, separation methods, chemical instruments and methods, etc., can solve the problems of complex process and high treatment cost, and achieve the effect of reducing operating load and efficient operation

Pending Publication Date: 2017-08-18
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned cyanide-containing waste gas treatment method is complicated in process and high in treatment cost

Method used

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  • Treatment method and system of cyanogens-containing organic waste gas

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Effect test

Embodiment 1

[0041] Such as figure 1 The shown processing system includes a cooler 4, an acid spray absorption tower 1, an alkali spray absorption tower 2, and a catalytic oxidation tower 3, which are connected in sequence. The air outlet of the previous device is connected to the air inlet of the next device for catalytic oxidation The tower 3 is composed of two parts: an upper packing layer and a bottom catalyst bed. The gas outlet of the catalytic oxidation tower 3 is in communication with the atmosphere. The upper part of the catalytic oxidation tower 3 is filled with ceramics; the lower part of the catalyst is a supported catalyst, with activated carbon as the carrier and copper as the active component.

[0042] The catalytic oxidation tower is connected with the chlorine dioxide preparation device 6 and the transfer tank, the auxiliary catalytic oxidation reaction tank, and the auxiliary oxidant adding device. The flow path is also provided with pH and concentration detectors (not show...

Embodiment 2

[0045] The cyanidation reaction process of the disperse blue B60 production process in a factory produced mixed waste gas containing hydrogen cyanide, DMF, and higher concentrations of ammonia and aniline. Of which hydrogen cyanide 330-350mg / m 3 , Ammonia 180mg / m 3 , TVOC is about 1200mg / m 3 .

[0046] Exhaust gas at 2000m 3 The flow rate per hour enters the condenser, the condensation temperature is -10℃, the condensed waste gas enters the pickling tower, and the hydrogen chloride concentration is 10% countercurrent absorption, the liquid to gas ratio is 6, and the hydrogen cyanide content after absorption is about 280mg / m 3 , The ammonia content is about 12mg / m 3 , TVOC is about 980mg / m 3 .

[0047] The acid-washed exhaust gas enters the alkali spray tower and is absorbed countercurrently with the mass fraction of 12% sodium hydroxide. The liquid-gas ratio of the alkali spray tower is 7, the exhaust gas flow rate is 0.8m / s, and the absorption temperature is 35°C. After hydrogen c...

Embodiment 3

[0051] Disperse blue B60 production process in a factory produced mixed waste gas containing hydrogen cyanide and low-concentration ammonia during the cyanidation reaction process. Of which hydrogen cyanide 220-250mg / m 3 , Ammonia 140mg / m 3 , TVOC is about 1000mg / m 3 .

[0052] Exhaust gas at 1800m 3 The flow rate per hour enters the condenser, the condensation temperature is -10℃, the condensed waste gas enters the pickling tower, and the hydrogen chloride concentration is 10% countercurrent absorption, the liquid to gas ratio is 6, and the hydrogen cyanide content after absorption is about 180mg / m 3 , The ammonia content is about 22mg / m 3 , TVOC is about 870mg / m 3 .

[0053] The acid-washed exhaust gas enters the alkali spray tower and is absorbed countercurrently with the mass fraction of 12% sodium hydroxide. The liquid-gas ratio of the alkali spray tower is 6.5, the exhaust gas flow rate is 0.6m / s, and the absorption temperature is 30°C. After hydrogen cyanide content is about...

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Abstract

The invention discloses a treatment method of cyanogens-containing organic waste gas. The waste gas is subjected to gas collection, is firstly treated by a cooler and a defoaming device, and then enters an acid washing tower to be subjected to acid washing and spraying so that ammonia gas and partial organic matters in the waste gas can be removed; then, the waste gas enters an alkaline washing tower and is sprayed by alkaline liquid; hydrogen cyanide and alkaline liquid take a reaction to produce a sodium cyanide water solution; partial water-soluble organic matters are absorbed by the alkaline liquid; the low-concentration organic waste gas discharged from the alkaline washing tower enters a catalytic oxidization tower, is absorbed by spraying liquid containing oxidizing agents of chlorine dioxide sprayed from the tower top, and then takes an oxygenolysis reaction through a catalyst bed layer; the rest waste gas is exhausted in a standard reaching way after finally passing an active carbon absorption tower. In the treatment process, no waste water or only a small amount of waste water is generated; the HCN in the waste gas is oxidized into harmless nontoxic and harmless N2 and CO2; the HCN removal rate can reach 99 percent or higher, so that the cyanide in the waste liquid is discharged in a standard reaching manner; the whole waste gas treatment process is simple; the treatment effect is good.

Description

Technical field [0001] The invention belongs to the technical field of waste gas treatment, and particularly relates to a treatment method and system for cyanogen-containing organic waste gas. Background technique [0002] The cyanide reaction is a common reaction in the chemical field. The cyanide-containing waste gas produced during the reaction is very toxic and must be treated to meet the emission standards before it can be discharged. [0003] Chinese patent application 201510687800X discloses a method for treating cyanide-containing waste gas. The steps are as follows: the cyanide-containing waste gas is fed into the first-stage absorption tower and the second-stage absorption tower through a blower, and the cyanide-containing waste gas contacts the absorption liquid from the bottom of the tower to the top of the tower , The HCN contained in the exhaust gas is transferred to the liquid phase to undergo oxidation reaction with the NaClO absorption liquid. Among them, the pH of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/54
CPCB01D53/002B01D53/02B01D53/54B01D53/75B01D2257/406B01D2257/408B01D2257/708B01D2257/70B01D2253/102B01D2251/108
Inventor 毛兵陈磊吴勇前王栋林金华梁伟
Owner ZHEJIANG QICAI ECO TECH CO LTD
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