CN102441317A - Benzene chloride tail gas recovering and purifying method - Google Patents
Benzene chloride tail gas recovering and purifying method Download PDFInfo
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- CN102441317A CN102441317A CN2011103270649A CN201110327064A CN102441317A CN 102441317 A CN102441317 A CN 102441317A CN 2011103270649 A CN2011103270649 A CN 2011103270649A CN 201110327064 A CN201110327064 A CN 201110327064A CN 102441317 A CN102441317 A CN 102441317A
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- benzene
- tail gas
- benzene chloride
- purification method
- chloride tail
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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 organochlorine product.With the Benzene Chloride is that raw material can be produced a series of organic chemical industry's products such as phenol, nitro-chlorobenzene, dinitrofluorobenzene, picric acid, and further processing can be made products such as dyestuff, pesticide, rubber processing aids, medicine.At present the main employing benzene chloridising of domestic production Benzene Chloride is promptly reacted in the 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 slightly, rectifying column distills and obtain the finished product Benzene Chloride.Mainly contain hydrogen chloride gas, benzene vapor and small amounts of chlorine benzene vapor in the tail gas that the preparation process generates, directly discharging causes wastage of material and serious environmental to pollute.On the south 120,000 tons of/year 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 big environmental pollution; Cause material loss simultaneously, the products benzene consumption is high.Benzene content is higher in the tail gas in addition, is prone to enrichment in tail gas absorber, meets thunder and lightning weather or static factor, and the benzene explosion accident very easily takes place, and this type of accident occurs repeatedly in former chemical plant.
The improvement of organic exhaust gas is a very big difficult problem at present simultaneously; From the protection environmental also is a problem that extremely urgent needs solve; Therefore, from the actual conditions of production technology, develop and effectively to administer exhaust emission, can reclaim the process and the method for useful constituent again; Have important practical significance, economic worth and environmental benefit, also will exemplary role be provided for the exhaust-gas treatment of similar process units.
Summary of the invention
The object of the invention solves the problem and shortage that exists in the prior art; A kind of Benzene Chloride tail gas recycle purification method is provided; The consumption of benzene makes discharge tail gas reach the ppm level simultaneously in the Benzene Chloride technology that this method not only reduces greatly, and remarkable economic efficiency and environmental benefit are arranged.
The present invention realizes through following technical scheme:
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 behind washing unit, alkali cleaning unit, send into the benzene absorptive unit by blower fan; Then tail gas gets into 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, and the absorbent in the wherein said benzene absorptive unit is a Benzene Chloride.
Benzene Chloride tail gas recycle purification method of the present invention, its further technical scheme are that described adsorbent is a modified activated carbon; Again further technical scheme be described modified activated carbon be active carbon dry through copper nitrate solution dipping back and under microwave condition modification obtain modified activated carbon; Technical scheme further is that the concentration of described copper nitrate solution is 0.02～0.06mol/L; Technical scheme further 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; Made full use of the operating feature that absorbs and adsorb two unit operations, absorbed operation and be applicable to big concentration of component operation, treating capacity is big; 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.Technology 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 absorbed by the Benzene Chloride absorption liquid in the tail gas, and then tail gas gets into temperature swing adsorption system, and organic gas such as benzene and Benzene Chloride are adsorbed agent absorption; All the other inert gas qualified discharges, the saturated back of adsorbent adopt the method regeneration of hot reactivation 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 a 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 combining accompanying drawing that technology of the present invention is 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 gets into 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 a Benzene Chloride.
Washing unit: contain benzene 7000-10000mg/m
3Benzene Chloride tail gas at first gets into the air inlet surge tank, gets into the diluted acid tower again and sprays counter-current absorption with water, and absorption liquid is incorporated the diluted acid jar into.Washing cat head water spray is regulated according to sour dense situation in the diluted acid jar, normally is controlled at 1200～3000 liters/hour, and simultaneous temperature is controlled at 30 ℃.
The alkali cleaning unit: the tail gas after washing gets into 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 used for synthetic clorox.Hydro-oxidation sodium and fresh water (FW) are opened the alkali pump circulation in the alkali jar, 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 gets into 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 still liquid continuously to keep metastable tower bottoms position; Guarantee the absorptivity of Benzene Chloride to benzene, temperature is controlled at below 6 ℃.
Temperature swing adsorption system: the tail gas after the benzene absorptive unit absorbs gets into temperature swing adsorption system, and temperature swing adsorption system is made up 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 all will experience absorption, purging, desorption, dries up, step such as absorption again, and the multitower alternate cycles makes absorption, regeneration be able to carry out 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, and adsorbent reactivation dries up adsorbent with inert gas and reduces the adsorption tower temperature simultaneously after accomplishing, and guarantees the effect of adsorbent reactivation.
Organic concentration is reduced to below the 10PPm in the tail gas after transformation absorption, reaches the discharge standard of country.
Claims (10)
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 gets into 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, and the absorbent in the wherein said benzene absorptive unit is a Benzene Chloride.
2. Benzene Chloride tail gas recycle purification method according to claim 1 is characterized in that described adsorbent is a modified activated carbon.
3. Benzene Chloride tail gas recycle purification method according to claim 2, it is characterized in that described modified activated carbon to be active carbon through copper nitrate solution dipping back dry and under microwave condition modification obtain modified activated carbon.
4. Benzene Chloride tail gas recycle purification method according to claim 3, the concentration that it is characterized in that described copper nitrate solution is 0.02～0.06mol/L.
5. Benzene Chloride tail gas recycle purification method according to claim 3, the power that it is characterized in that described microwave is 50～200W.
6. Benzene Chloride tail gas recycle purification method according to claim 1 is characterized in that described temperature swing adsorption system adopts the multitower continued operation, and temperature remains on 10～40 ℃.
7. 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.
8. 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 ℃.
9. Benzene Chloride tail gas recycle purification method according to claim 1 is characterized in that the temperature on the absorption tower of described benzene absorptive unit remains on-20～20 ℃.
10. Benzene Chloride tail gas recycle purification method according to claim 2 is characterized in that described adsorbent reactivation adopts heat regeneration, and temperature remains on 120～220 ℃.
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| CN 201110327064 CN102441317B (en) | 2011-10-25 | 2011-10-25 | Benzene chloride tail gas recovering and purifying method |
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| CN 201110327064 CN102441317B (en) | 2011-10-25 | 2011-10-25 | Benzene chloride tail gas recovering and purifying method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104225951A (en) * | 2014-09-25 | 2014-12-24 | 南京都乐制冷设备有限公司 | Benzene organic vapor recycling device and benzene organic vapor recycling method |
| 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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2011
- 2011-10-25 CN CN 201110327064 patent/CN102441317B/en active Active
Patent 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 |
Non-Patent Citations (1)
| 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》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104225951A (en) * | 2014-09-25 | 2014-12-24 | 南京都乐制冷设备有限公司 | Benzene organic vapor recycling device and benzene organic vapor recycling method |
| 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 |
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| CN102441317B (en) | 2013-10-30 |
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