CN220310121U - Tritoluene reaction tail gas purification device - Google Patents
Tritoluene reaction tail gas purification device Download PDFInfo
- Publication number
- CN220310121U CN220310121U CN202320716264.1U CN202320716264U CN220310121U CN 220310121 U CN220310121 U CN 220310121U CN 202320716264 U CN202320716264 U CN 202320716264U CN 220310121 U CN220310121 U CN 220310121U
- Authority
- CN
- China
- Prior art keywords
- tail gas
- cooler
- absorption tower
- port
- trichlorotoluene
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 13
- 238000000746 purification Methods 0.000 title claims abstract description 6
- 238000010521 absorption reaction Methods 0.000 claims abstract description 39
- 239000007788 liquid Substances 0.000 claims abstract description 28
- 238000009833 condensation Methods 0.000 claims abstract description 20
- 230000005494 condensation Effects 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 20
- XEMRAKSQROQPBR-UHFFFAOYSA-N (trichloromethyl)benzene Chemical compound ClC(Cl)(Cl)C1=CC=CC=C1 XEMRAKSQROQPBR-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000010992 reflux Methods 0.000 claims abstract description 8
- 239000000498 cooling water Substances 0.000 claims description 8
- 239000011344 liquid material Substances 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims 2
- 239000002253 acid Substances 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 claims 1
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 abstract description 24
- 239000007789 gas Substances 0.000 abstract description 22
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 abstract description 5
- 239000000460 chlorine Substances 0.000 abstract description 5
- 229910052801 chlorine Inorganic materials 0.000 abstract description 5
- 238000003786 synthesis reaction Methods 0.000 abstract description 5
- 239000002912 waste gas Substances 0.000 abstract description 4
- 239000002351 wastewater Substances 0.000 abstract description 3
- 239000005416 organic matter Substances 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 21
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 125000004803 chlorobenzyl group Chemical group 0.000 description 3
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 3
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- HUMNYLRZRPPJDN-UHFFFAOYSA-N benzaldehyde Chemical compound O=CC1=CC=CC=C1 HUMNYLRZRPPJDN-UHFFFAOYSA-N 0.000 description 2
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005660 chlorination reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000005711 Benzoic acid Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000010233 benzoic acid Nutrition 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- QNGNSVIICDLXHT-UHFFFAOYSA-N para-ethylbenzaldehyde Natural products CCC1=CC=C(C=O)C=C1 QNGNSVIICDLXHT-UHFFFAOYSA-N 0.000 description 1
- WVDDGKGOMKODPV-ZQBYOMGUSA-N phenyl(114C)methanol Chemical compound O[14CH2]C1=CC=CC=C1 WVDDGKGOMKODPV-ZQBYOMGUSA-N 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Abstract
The utility model discloses a trichlorotoluene reaction tail gas purification device which comprises a primary cooler, a secondary cooler, an absorption tower, a circulating pump, a demister and a filter, wherein the top of the absorption tower is provided with a raw material inlet, an absorption outlet and a first reflux port, the middle part of the absorption tower is provided with a second reflux port, the lower part of the absorption tower is provided with a tail gas inlet, the bottom of the absorption tower is provided with a raw material outlet, the primary cooler and the secondary cooler are respectively provided with a first condensation port and a second condensation port, the demister is provided with a liquid outlet, and the absorption outlet is connected with the inlet of the primary cooler. The method ensures that the waste gas reacts with fresh toluene raw materials in the absorption tower, ensures that the residual chlorine in the waste gas is effectively absorbed and utilized, does not influence the synthesis reaction of the trichlorotoluene, and returns toluene-containing organic matter liquid recovered by secondary condensation and demisting to the absorption tower for recycling, thereby effectively improving the product yield, protecting the process and almost avoiding the generation of waste water.
Description
Technical Field
The utility model relates to the technical field of chemical synthesis, in particular to a device for purifying tail gas generated in a trichlorotoluene reaction.
Background
The trichlorotoluene is obtained by using toluene and chlorine as raw materials and performing side chain chlorination reaction. The tail gas of the chlorination reaction is mainly hydrogen chloride, partially volatilized organic matters (toluene, chlorobenzyl and the like) and a small amount of unreacted chlorine. The chlorobenzyl substances can be hydrolyzed in hydrochloric acid to generate benzyl alcohol, benzaldehyde, benzoic acid and the like, and can be polymerized with each other to generate a polymer which is difficult to treat and utilize, and if the tail gas directly enters an absorption system for preparing hydrochloric acid, the co-produced hydrochloric acid contains toluene, chlorobenzyl organic matters and the like, so that the quality and comprehensive utilization of hydrochloric acid products are influenced, and even secondary pollution is generated.
The tail gas generated in the prior production of the trichlorotoluene is subjected to primary water cooling and secondary freezing and deep cooling, most of organic matters are recovered, and the tail gas after multi-stage condensation still contains about 1% of organic matters. In the prior art, a hydrochloric acid purification process of resin adsorption is often adopted to reduce the content of organic matters in hydrochloric acid, but the organic matters obtained by analysis after resin adsorption are treated by three wastes only in quality, and a large amount of waste water which is difficult to degrade is generated in the process of resin regeneration, so that the treatment cost is high.
Disclosure of Invention
The utility model aims to provide a device for purifying tail gas generated in a trichlorotoluene reaction, which overcomes the defects in the prior art.
In order to achieve the above purpose, the present utility model provides the following technical solutions: including one-level cooler, second grade cooler, still include absorption tower, circulating pump, defroster, filter, the absorption tower top is equipped with raw materials entry, absorption export, backward flow mouth first, and the middle part is equipped with backward flow mouth second, and the lower part is equipped with the tail gas entry, and the bottom is equipped with the raw materials export, one-level cooler, second grade cooler are equipped with condensation mouth first, condensation mouth second respectively, the defroster is equipped with the liquid outlet, absorption exit linkage the entry of one-level cooler, condensation mouth first connection backward flow mouth first, the exit linkage of one-level cooler the entry of second grade cooler, the exit linkage of second grade cooler the entry of defroster, the entrance linkage of circulating pump raw materials export, condensation mouth second, the liquid outlet, the exit linkage of circulating pump the backward flow mouth second, the circulating pump export is provided with the liquid material pipe of the next synthetic process of intercommunication, the exit linkage of defroster the filter entry, the filter exit linkage is to the system sour process.
Preferably, an activated carbon filter layer is arranged in the filter.
Preferably, the primary cooler and the secondary cooler are both provided with circulating cooling water.
Preferably, the cooling water flows in the opposite direction to the tail gas to be condensed.
Preferably, a liquid level controller is arranged on the absorption tower, a flow control valve is arranged on the liquid pipe, and the liquid level controller is connected with the flow control valve.
Preferably, the circulating pump is two pumps connected in parallel, and the two pumps are respectively positioned at one side of a pipeline connected with the second reflux port and one side of the liquid material pipe.
The utility model has the beneficial effects that:
1. the product yield is high: the waste gas reacts with fresh toluene raw material in the absorption tower, so that the residual chlorine in the waste gas is effectively absorbed and utilized, the synthesis reaction of the trichlorotoluene is not influenced, and the toluene-containing organic matter liquid recovered by secondary condensation and demisting is returned to the absorption tower for recycling, so that the product yield is effectively improved.
2. The working procedure is environment-friendly: the residual organic matters are filtered and recovered after secondary condensation and demisting, finally, the water is added into the next step to form hydrochloric acid, almost no waste water is generated, the traditional technology is avoided that the organic matters are adsorbed by the resin after the hydrochloric acid is prepared by adding water, the organic matters obtained after the resin adsorption are poor in quality and can not be reused, and the three-waste treatment can only be performed.
Drawings
Fig. 1 is a schematic structural view of an embodiment of the present utility model.
In the figure: 1. an absorption tower; 11. a raw material inlet; 12. an absorption outlet; 13. a return port I; 14. a second return port; 15. a tail gas inlet; 16. a raw material outlet; 17. a liquid level controller; 2. a primary cooler; 21. a first condensation port; 3. a secondary cooler; 31. a second condensation port; 4. a circulation pump; 5. a demister; 51. a liquid outlet; 6. a filter; 7. a liquid pipe; 71. a flow control valve.
Detailed Description
The present utility model will be further described in detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the detailed description and specific examples, while indicating the utility model, are intended for purposes of illustration only and are not intended to limit the scope of the utility model. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present utility model.
Referring to fig. 1, an embodiment of the utility model provides a device for purifying reaction tail gas of trichlorotoluene, which comprises a primary cooler 2, a secondary cooler 3, an absorption tower 1, a circulating pump 4, a demister 5, and a filter 6, wherein the top of the absorption tower 1 is provided with a raw material inlet 11, an absorption outlet 12, a reflux inlet 13, the middle part is provided with a reflux inlet second 14, the lower part is provided with a tail gas inlet 15, the bottom is provided with a raw material outlet 16, the primary cooler 2 and the secondary cooler 3 are respectively provided with a condensation inlet first (21) and a condensation inlet second 31, the demister 5 is provided with a liquid outlet 51, the absorption outlet 12 is connected with the inlet of the primary cooler 2, the condensation inlet first (21) is connected with the reflux inlet first 13, so that condensed liquid flows back to the absorption tower 1, the outlet of the primary cooler 2 is connected with the inlet of the secondary cooler 3 in a trichlorotoluene synthesis flow, further cooling to liquefy the organic matters and enter a trichlorotoluene synthesis flow, wherein an outlet of the secondary cooler 3 is connected with an inlet of the demister 5, the demister 5 can further remove residual organic matters in tail gas, an inlet of the circulating pump 4 is connected with the raw material outlet 16, a second condensation port 31 and a liquid outlet 51, so that the raw materials from the absorption tower 1 are converged with the liquid from the cooler and the demister 5, and are fully mixed by the circulating pump 4, the temperature of the raw material outlet 16 is higher because the raw material is exothermic in the process of producing trichlorotoluene by reacting the raw materials with chlorine in the tail gas, the temperature of the top of the absorption tower 1 is lower, the internal temperature of the secondary cooler 3 is very low, generally zero, the liquid from the secondary cooler 3 and the demister 5 is converged with the liquid from the discharge port of the absorption tower 1, can play the effect of certain control temperature and can not influence the normal clear of trichlorotoluene synthetic reaction, the exit linkage of circulating pump 4 reflux mouth two 14, circulating pump 4 export is provided with liquid material pipe 7 in the next synthetic process of intercommunication in order to continue to synthesize trichlorotoluene, the exit linkage of defroster 5 filter 6 entry, filter 6 exit linkage is to making sour process, and the next step only needs to add water and absorbs hydrogen chloride gas and can obtain hydrochloric acid solution.
An activated carbon filter layer is arranged in the filter 6 to adsorb residual organic matters in the gas.
The primary cooler 2 and the secondary cooler 3 are both provided with circulating cooling water, wherein the cooling water used by the primary cooler 2 is 35 ℃, and the cooling water used by the secondary cooler 3 is strong brine at the temperature of minus 14 ℃.
The cooling water flow direction is opposite to the flow direction of the tail gas to be condensed so as to improve the cooling effect.
The absorption tower 1 is provided with a liquid level controller 17, the liquid pipe 7 is provided with a flow control valve 71, and the liquid level controller 17 controls the flow control valve 71 according to the liquid level condition inside the absorption tower 1 so as to maintain the liquid level in the absorption tower 1 to a set value.
The circulating pump 4 is two pumps that connect in parallel, two pumps are located respectively and connect one side of the pipeline of return port two 14 with connect one side of liquid material pipe 7, and this setting can be according to the power of two motors of actual conditions adjustment, in order to prevent return port two 14 with liquid material pipe 7 leads to liquid to only flowing to one side because of the pressure difference is too big, the entry of circulating pump 4 still is provided with the blowoff valve and convenient maintenance.
The working process of the utility model comprises the following steps:
during operation, tail gas is introduced into the absorption tower 1 to react with fresh toluene for absorption, the rest part is introduced into the primary cooler 2 from the top of the absorption tower 1, is introduced into the secondary cooler 3 from the primary cooler 2, gradually reduces the temperature, is then introduced into the demister 5, so that organic matters in the tail gas are liquefied, the liquefied organic matters are introduced into the absorption tower 1 for reuse, and finally, the rest non-liquefied gaseous organic matters are adsorbed through the filter 6, so that purer hydrogen chloride gas is obtained.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, or alternatives falling within the spirit and principles of the utility model.
Claims (6)
1. The utility model provides a trichlorotoluene reaction tail gas purification device, includes primary cooler (2), second grade cooler (3), its characterized in that: still include absorption tower (1), circulating pump (4), defroster (5), filter (6), absorption tower (1) top is equipped with raw materials entry (11), absorption export (12), return port one (13), and the middle part is equipped with return port two (14), and the lower part is equipped with tail gas entry (15), and the bottom is equipped with raw materials export (16), first condensation port one (21), second condensation port two (31) are equipped with respectively in first stage cooler (2), second stage cooler (3), defroster (5) are equipped with liquid outlet (51), absorption export (12) are connected the entry of first stage cooler (2), first condensation port (21) are connected return port one (13), the exit linkage of first stage cooler (2) the entry of second stage cooler (3), the exit linkage of second stage cooler (3) the entry of defroster (5), the entry linkage of circulating pump (4) raw materials export (16), second condensation port (31), liquid outlet (51), second circulation pump (4) the exit linkage of return port (14), first stage cooler (7) have the inlet of circulation pump (7), the outlet of the filter (6) is connected to the acid making process.
2. The apparatus for purifying the tail gas of the reaction of trichlorotoluene according to claim 1, wherein: an active carbon filter layer is arranged in the filter (6).
3. The apparatus for purifying the tail gas of the reaction of trichlorotoluene according to claim 1, wherein: the primary cooler (2) and the secondary cooler (3) are both provided with circulating cooling water.
4. A chloroform reaction tail gas purification device as defined in claim 3, wherein: the cooling water flows in the direction opposite to the flow direction of the tail gas to be condensed.
5. The apparatus for purifying the tail gas of the reaction of trichlorotoluene according to claim 1, wherein: the absorption tower (1) is provided with a liquid level controller (17), the liquid pipe (7) is provided with a flow control valve (71), and the liquid level controller (17) is connected with the flow control valve (71).
6. The apparatus for purifying the tail gas of the reaction of trichlorotoluene according to claim 1, wherein: the circulating pump (4) is two pumps connected in parallel, and the two pumps are respectively positioned at one side of a pipeline connected with the second reflux port (14) and one side of the liquid material pipe (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320716264.1U CN220310121U (en) | 2023-04-04 | 2023-04-04 | Tritoluene reaction tail gas purification device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320716264.1U CN220310121U (en) | 2023-04-04 | 2023-04-04 | Tritoluene reaction tail gas purification device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220310121U true CN220310121U (en) | 2024-01-09 |
Family
ID=89419930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320716264.1U Active CN220310121U (en) | 2023-04-04 | 2023-04-04 | Tritoluene reaction tail gas purification device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220310121U (en) |
-
2023
- 2023-04-04 CN CN202320716264.1U patent/CN220310121U/en active Active
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| GR01 | Patent grant |