CN102441317B - Benzene chloride tail gas recovering and purifying method - Google Patents
Benzene chloride tail gas recovering and purifying method Download PDFInfo
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- CN102441317B CN102441317B CN 201110327064 CN201110327064A CN102441317B CN 102441317 B CN102441317 B CN 102441317B CN 201110327064 CN201110327064 CN 201110327064 CN 201110327064 A CN201110327064 A CN 201110327064A CN 102441317 B CN102441317 B CN 102441317B
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Abstract
The invention discloses a benzene chloride tail gas recovering and purifying method. With the method, benzene consumption in benzene chloride technologies can be greatly reduced, and discharged tail gas can reach a ppm grade. Therefore, substantial economic and environment benefits are brought in. The benzene chloride tail gas recovering and purifying method provided by the invention comprises steps that: tail gas containing benzene chloride is processed by using a washing unit and an alkali washing unit, and is delivered into a benzene absorbing unit by using a blower; the tail gas is then delivered into a temperature swing adsorption system containing an absorbent; benzene and benzene chloride organic gas is absorbed by the absorbent, and other inert gas reaches a discharging standard and is discharged. According to the invention, the absorbent in the benzene absorbing unit is benzene chloride.
Description
Technical field
The present invention relates to a kind of recovery and purification method of tail gas, more specifically to a kind of Benzene Chloride tail gas recycle purification method.
Background technology
Benzene Chloride is the intermediate of important dyestuff, medicine, organic synthesis, is one of important organic chlorides.Can produce a series of Organic chemical products such as phenol, nitro-chlorobenzene, dinitrofluorobenzene, picric acid take Benzene Chloride as raw material, further processing can be made the products such as dyestuff, pesticide, rubber processing aids, medicine.At present the main employing benzene chloridising of domestic production Benzene Chloride is namely reacted in chlorination tower with purified petroleum benzin and dry chlorine gas, and the chlorated liquid of generation is through washing, and neutralization after the drying, is sent into thick, rectifying column and distilled and obtain the finished product Benzene Chloride.Mainly contain hydrogen chloride gas, benzene vapor and a small amount of chlorobenzene steam in the tail gas that preparation process generates, directly discharging causes wastage of material and serious environmental pollution.On the south 120,000 ton/years of Benzene Chloride projects of change company be example, through initial analysis, contain benzene 7000-10000mg/m3 in the Benzene Chloride tail gas, tail gas amount 15000m3/h hourly contains benzene tail gas and enters in the air, causes very large environmental pollution; Cause simultaneously material loss, the products benzene consumption is high.Benzene content is higher in the tail gas in addition, and easily enrichment in tail gas absorber meets thunder and lightning weather or static factor, and the benzene explosion accident very easily occurs, and this type of accident occurs repeatedly in former chemical plant.
The improvement of organic exhaust gas is a very large difficult problem at present simultaneously; also be the problem that extremely urgent needs solve from the protection of the environment angle; therefore; actual conditions from production technology; develop and effectively to administer exhaust emission, can reclaim process and the method for useful constituent again; have important practical significance, economic worth and environmental benefit, also will provide exemplary role for the exhaust-gas treatment of similar process units.
Summary of the invention
Purpose of the present invention solves problems of the prior art and deficiency, a kind of Benzene Chloride tail gas recycle purification method is provided, the consumption of benzene in the Benzene Chloride technique that the method not only reduces greatly so that the tail gas of discharging reaches the ppm level, has significant economic benefit and environmental benefit simultaneously.
The present invention is achieved by the following technical solutions:
Benzene Chloride tail gas recycle purification method of the present invention, it may further comprise the steps: will contain benzene Benzene Chloride tail gas and send into the benzene absorptive unit by blower fan behind washing unit, alkali cleaning unit, then tail gas enters the temperature swing adsorption system that contains adsorbent, benzene and Benzene Chloride organic gas are adsorbed agent absorption, all the other inert gas qualified discharges, the absorbent in the wherein said benzene absorptive unit is Benzene Chloride.
Benzene Chloride tail gas recycle purification method of the present invention, its further technical scheme are that described adsorbent is modified activated carbon; Further technical scheme be described modified activated carbon be active carbon through copper nitrate solution dipping post-drying and under microwave condition modification obtain modified activated carbon; Further technical scheme is that the concentration of described copper nitrate solution is 0.02～0.06mol/L; Further technical scheme can also be that the power of described microwave is 50～200W.
Benzene Chloride tail gas recycle purification method of the present invention, its further technical scheme can also be that described temperature swing adsorption system adopts the multitower continued operation, and temperature remains on 10～40 ℃.
Temperature remained on 20～60 ℃ when Benzene Chloride tail gas recycle purification method of the present invention, its further technical scheme can also be the washing of described washing unit, and pressure remains on 0.05～0.25MPa.
Benzene Chloride tail gas recycle purification method of the present invention, its further technical scheme can also be the acidic materials after described alkali cleaning unit absorbs washing, make system reach neutral, and the operating temperature during alkali cleaning remains on 20～60 ℃.
Benzene Chloride tail gas recycle purification method of the present invention, the temperature that its further technical scheme can also be the absorption tower of described benzene absorptive unit remain on-20～20 ℃.
Benzene Chloride tail gas recycle purification method of the present invention, its further technical scheme can also be that described adsorbent reactivation adopts heat regeneration, and temperature remains on 120～220 ℃.
Compared with prior art the present invention has following beneficial effect:
Method of the present invention, take full advantage of the operating feature that absorbs and adsorb two unit operations, absorption operation is applicable to large concentration of component operation, treating capacity is large, energy consumption is low, born 95% load of vent gas treatment, adsorption operations then can be reduced to the organic matter in the tail gas ppm concentration, makes tail gas reach discharge standard.Technique of the present invention, overall efficiency is high, energy consumption is low, and operating cost is low, environmental friendliness.To contain benzene 7000-10000mg/m3 Benzene Chloride tail gas through washing, send into absorption system by blower fan after the alkali cleaning, most benzene is chlorinated the absorption of benzene absorption liquid in the tail gas, then tail gas enters temperature swing adsorption system, the organic gas such as benzene and Benzene Chloride is adsorbed agent absorption, all the other inert gas qualified discharges, the method regeneration of the saturated rear employing hot reactivation of adsorbent is for subsequent use.Absorption portion has been born 95% load of vent gas treatment, and absorbed portion then can be reduced to the organic matter in the tail gas ppm concentration; The adsorbent that absorption portion adopts is modified activated carbon, and the more unmodified charcoal absorption amount of the active carbon after the modification has promoted more than 15%.
Description of drawings
Fig. 1 is the used process flow diagram of the present invention
Concrete embodiment
Below for by reference to the accompanying drawings technique of the present invention being described further.
Embodiment 1
To contain benzene 7000-10000mg/m
3Benzene Chloride tail gas is sent into the benzene absorptive unit by blower fan behind washing unit, alkali cleaning unit, then tail gas enters the temperature swing adsorption system that contains adsorbent, benzene and Benzene Chloride organic gas are adsorbed agent absorption, all the other inert gas qualified discharges, the absorbent in the wherein said benzene absorptive unit is Benzene Chloride.
Washing unit: contain benzene 7000-10000mg/m
3Benzene Chloride tail gas at first enters the air inlet surge tank, enters the diluted acid tower again and sprays counter-current absorption with water, and absorption liquid is incorporated the diluted acid tank into.Water scrubber top water spray is regulated according to sour dense situation in the diluted acid tank, normally is controlled at 1200～3000 l/hs, and simultaneous temperature is controlled at 30 ℃.
The alkali cleaning unit: the tail gas after washing enters the alkali cleaning unit, mainly is the remaining chlorine of possibility in the flush away tail gas, guarantees the normal operation of follow-up equipment; The alkali lye of washing is for the synthesis of clorox.Hydro-oxidation sodium and fresh water (FW) are opened the alkali pump circulation in the alkali tank, the preparation mass concentration is 13～15% liquid caustic soda, and the heat of dilution and reaction heat are shifted out by heat exchanger therebetween, and the control solution temperature is below 40 ℃.
The benzene absorptive unit: the tail gas after alkali cleaning enters the benzene absorptive unit, the fresh chlorobenzene of quantitative low temperature is advanced the tower spray by cat head, and tower bottoms circulates with pump, goes out continuously still liquid to keep metastable tower reactor liquid level, guarantee Benzene Chloride to the benzene absorption rate, temperature is controlled at below 6 ℃.
Temperature swing adsorption system: the tail gas after the benzene absorptive unit absorbs enters temperature swing adsorption system, and temperature swing adsorption system is comprised of multitower, and wherein the part adsorption tower is in adsorbed state, and part absorption Tata is in the regenerative process in addition; Each tower will experience absorption, purging, desorption, dries up, the step such as absorption again, and the multitower alternate cycles is carried out absorption, regeneration continuously.Remain on during absorption below 40 ℃, guarantee that adsorbent is to organic adsorption effect.Adopt the high temperature regeneration adsorbent, temperature remains on more than 140 degree, after adsorbent reactivation is finished, dries up adsorbent with inert gas and reduces simultaneously the adsorption tower temperature, guarantees the effect of adsorbent reactivation.
Organic concentration is down to below the 10PPm in the tail gas behind pressure-variable adsorption, reaches the discharge standard of country.
Claims (6)
1. Benzene Chloride tail gas recycle purification method, it is characterized in that may further comprise the steps: will contain benzene Benzene Chloride tail gas and behind washing unit, alkali cleaning unit, send into the benzene absorptive unit by blower fan, then tail gas enters the temperature swing adsorption system that contains adsorbent, benzene and Benzene Chloride organic gas are adsorbed agent absorption, all the other inert gas qualified discharges, the absorbent in the wherein said benzene absorptive unit is Benzene Chloride; Wherein said adsorbent be active carbon through copper nitrate solution dipping post-drying and under microwave condition modification obtain modified activated carbon; Described temperature swing adsorption system adopts the multitower continued operation, and temperature remains on 10～40 ℃; The temperature on the absorption tower of described benzene absorptive unit remains on-20～20 ℃.
2. Benzene Chloride tail gas recycle purification method according to claim 1, the concentration that it is characterized in that described copper nitrate solution is 0.02～0.06mol/L.
3. Benzene Chloride tail gas recycle purification method according to claim 1, the power that it is characterized in that described microwave is 50～200W.
4. Benzene Chloride tail gas recycle purification method according to claim 1, temperature remains on 20～60 ℃ when it is characterized in that the washing of described washing unit, and pressure remains on 0.05～0.25MPa.
5. Benzene Chloride tail gas recycle purification method according to claim 1 is characterized in that the acidic materials after described alkali cleaning unit absorbs washing, makes system reach neutral, and the operating temperature during alkali cleaning remains on 20～60 ℃.
6. Benzene Chloride tail gas recycle purification method according to claim 1 is characterized in that described adsorbent reactivation adopts heat regeneration, and temperature remains on 120～220 ℃.
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| CN104225951B (en) * | 2014-09-25 | 2016-02-03 | 南京都乐制冷设备有限公司 | A kind of benzene class organic vapor recovery device and recovery method thereof |
| CN107855102A (en) * | 2016-09-22 | 2018-03-30 | 中国石油化工股份有限公司 | The preparation method and tail gas recycle purification method of Benzene Chloride tail gas adsorption agent |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1673207A (en) * | 2005-01-21 | 2005-09-28 | 锦化化工（集团）有限责任公司 | Chlorinated tail gas absorbing unit and method for chlorobenzene production |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1673207A (en) * | 2005-01-21 | 2005-09-28 | 锦化化工（集团）有限责任公司 | Chlorinated tail gas absorbing unit and method for chlorobenzene production |
Non-Patent Citations (2)
| Title |
|---|
| 张文革.氯化苯生产中的三废污染及其处理.《化工生产与技术》.1998,(第1期), |
| 氯化苯生产中的三废污染及其处理;张文革;《化工生产与技术》;19981231(第1期);第2节 * |
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