CN106215624A - The processing method of HCl in the two-stage nitration tail gas of a kind of benzene chloride production - Google Patents
The processing method of HCl in the two-stage nitration tail gas of a kind of benzene chloride production Download PDFInfo
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- CN106215624A CN106215624A CN201610630707.XA CN201610630707A CN106215624A CN 106215624 A CN106215624 A CN 106215624A CN 201610630707 A CN201610630707 A CN 201610630707A CN 106215624 A CN106215624 A CN 106215624A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1406—Multiple stage absorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1418—Recovery of products
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/20—Halogens or halogen compounds
- B01D2257/204—Inorganic halogen compounds
- B01D2257/2045—Hydrochloric acid
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Abstract
The invention discloses the processing method of HCl in the two-stage nitration tail gas of a kind of benzene chloride production, comprise the following steps: S1, benzene absorption is processed after two-stage nitration tail gas and one-level HCl circulating slot in absorbing liquid 1 enter in the same direction in one-level HCl absorption tower, gas-liquid separation, gas is gas A；S2, the absorbing liquid 2 in the gas A obtained in S1 and two grades of HCl circulating slots being entered in the same direction in two grades of HCl absorption towers, gas-liquid separation, gas is gas B；S3, the absorbing liquid 3 in the gas B obtained in S2 and three grades of HCl circulating slots being entered in the same direction in three grades of HCl absorption towers, gas-liquid separation, gas is gas C；After the gas C obtained in S4, S3 enters one-level spray absorber and contacts absorption with the reverse absorbing liquid 4 in one-level spray absorber, gas is gas D；The gas D obtained in S5, S4 enters two grades of spray absorbers, and after residual gas is vented by a pipeline high position, two-stage nitration vent gas treatment is complete.
Description
Technical field
The present invention relates to the two-stage nitration tail gas disposal technique field of benzene chloride production, particularly relate to the two of a kind of benzene chloride production
The processing method of HCl in section tail gas.
Background technology
Benzene Chloride is a kind of basic organic chemical industry raw material, and primary raw material is benzene and chlorine, and dried purified petroleum benzin passes through FeCl3Deng
The effect of catalyst, with chlorine generation chlorination reaction in chlorinator, the acid chlorization liquid obtained after reaction anhydrates, at alkali cleaning
Reason, dried entrance is thick, rectifying column distillation obtains finished product Benzene Chloride.Benzene chloride production is benzene chlorination under fluidized state, generates
Thing has chlorobenzene and hydrogen chloride gas.Due to high temperature continuous chlorination process, the removal of reaction heat realizes by the evaporation gasification of benzene,
Therefore mainly having hydrogen chloride gas, benzene vapor and a small amount of Benzene Chloride steam in the tail gas generated, direct discharge not only causes resource
Waste, and environment can be produced severe contamination.
By analysis, the 2000-6000ppm Han benzene in Benzene Chloride two-stage nitration tail gas, calculate tail per hour with existing production capacity
Tolerance is 8000m3/ h, absorbs through film-falling absorption tower through one section of recirculated water and two-stage nitration chilled brine condensed Benzene Chloride tail gas,
Now, benzene content in two-stage nitration tail gas can be made to drop to 40ppm.Then tail gas enters by 2 membrane absorbers, 1 packed absorber
The a set of absorption by Hydrochloric Acid system constituted absorbs, and in absorption process, logical cooling water between membrane absorber cylinder, makes the chlorine in cylinder
When changing hydrogen and water dissolution, liberated heat is removed in time, regulates cooling water inflow, keeps the hydrochloric acid temperature constant generated, and tail gas is through inhaling
Obtain the hydrochloric acid that mass fraction is 31-33wt% after receipts, naturally flow in hydrochloric acid tank and sell as side-product.
Existing technique uses falling liquid film circulating slot to absorb the benzene in tail gas, and falling liquid film tail gas enters absorption by Hydrochloric Acid system and uses washing
Waste water doping tap water absorbs HCl, is difficult to control to containing acid and the water yield in water, and 3 absorption towers are sequentially distributed from high to low, rely on weight
Power gravity flow enters next stage, and assimilation effect is poor, dilute instability time dense during acid concentration；Emptying end gas after process often contains
A large amount of HCl gases and benzene vapour, not only to environment, also result in very major injury to employee's health, be the most all difficult to
To effectively solving.The corresponding a set of independent exhaust treatment system of every suit chlorinator, equipment is many and operation is complicated, investment and maintenance cost
With height.Therefore, from the practical situation of production technology, exhaust emission can be effectively administered in exploitation, can reduce again material consumption and reclaim
The device of component, has great safe and environment-friendly and economic benefit, also provides reference for the similar vent gas treatment of chemical industry.
Summary of the invention
The technical problem that basic background technology exists, the present invention proposes HCl in the two-stage nitration tail gas of a kind of benzene chloride production
Processing method, the present invention can realize device continuous and stable run；The HCl gas that energy is a large amount of, fully absorb in two-stage nitration tail gas, makes
Tail gas reaches discharge standard；Set of device can corresponding multiple stage chlorinator, operating flexibility is big；Treating capacity is big, overall efficiency height and energy
Consuming low, operating cost is low, can accomplish safe and environment-friendly, nuisanceless to greatest extent.
The processing method of HCl in the two-stage nitration tail gas of a kind of benzene chloride production that the present invention proposes, comprises the following steps:
S1, benzene absorption is processed after two-stage nitration tail gas and one-level HCl circulating slot in absorbing liquid 1 enter one-level HCl in the same direction
In absorption tower, gas-liquid separation, liquid flows into one-level HCl circulating slot by pipeline, is uniformly mixed so as to obtain solution A, then follows through one-level HCl
Ring extraction pump extraction, removes benzene and obtains hydrochloric acid；Gas is gas A；
S2, the absorbing liquid 2 in the gas A obtained in S1 and two grades of HCl circulating slots is entered two grades of HCl absorption towers in the same direction
In, gas-liquid separation, liquid flows into two grades of HCl circulating slots by pipeline, is uniformly mixed so as to obtain solution B, and then overflow entrance one-level HCl is followed
Annular groove, gas is gas B；
S3, the absorbing liquid 3 in the gas B obtained in S2 and three grades of HCl circulating slots is entered three grades of HCl absorption towers in the same direction
In, gas-liquid separation, liquid flows into three grades of HCl circulating slots by pipeline, is uniformly mixed so as to obtain solution C, and then two grades of HCl of overflow entrance follow
Annular groove, gas is gas C；
The gas C that obtains in S4, S3 enter one-level spray absorber and with the reverse absorbing liquid 4 in one-level spray absorber
After contact absorbs, liquid flows into three grades of HCl circulating slots by pipeline, is uniformly mixed so as to obtain solution D, and gas is gas D；
The gas D that obtains in S5, S4 enter two grades of spray absorbers and with the absorbing liquid 5 in two grades of spray-absorption circulating slots
Inversely contacting absorption, liquid flows back to two grades of spray-absorption circulating slots, is uniformly mixed so as to obtain solution E；Residual gas is put by a pipeline high position
After sky, two-stage nitration vent gas treatment is complete.
Preferably, in S1, the temperature of the two-stage nitration tail gas after benzene absorption process is-11 to-9 DEG C.
Preferably, in S1, in solution A, the mass fraction of HCl is 31-33wt%.
Preferably, in S1, the temperature of gas A is 55-65 DEG C.
Preferably, in S2, in solution B, the mass fraction of HCl is 8-12wt%.
Preferably, in S2, the temperature of gas B is 30-40 DEG C.
Preferably, in S3, in solution C, the mass fraction of HCl is 0.5-1.5wt%.
Preferably, in S3, the temperature of gas C is 20-25 DEG C.
Preferably, in S4, the mass fraction≤10ppm of HCl in gas D.
Preferably, in S5, to periodically add supplementary absorbing liquid to two grades of spray-absorption circulating slots.
Preferably, in S5, after solution E absorption tail gas is saturated, process through two grades of spray-absorption circulating pump extraction to waste water
Operation.
Preferably, in S5, the mass fraction≤0.5ppm of HCl in residual gas.
Preferably, absorbing liquid 5 is 28-32wt% sodium hydrate aqueous solution for mass fraction or ammonia content is 25-29wt%
Ammonia in one.
Preferably, absorbing liquid 4 is the one in tap water or high purity water.
Preferably, absorbing liquid 3 is solution D.
Preferably, absorbing liquid 2 is solution C.
Preferably, absorbing liquid 1 is solution B.
Preferably, the absorbing liquid in one-level HCl circulating slot, two grades of HCl circulating slots, three grades of HCl circulating slots is respectively through one-level
HCl circulation extraction pump, two grades of HCl circulating pumps, three grades of HCl circulating pumps conveyings, respectively enter the one-level HCl absorption tower of correspondence, two
In level HCl absorption tower, three grades of HCl absorption towers.
Preferably, all it is lined with phenolic fiberglass reinforced plastics in one-level HCl circulating slot, two grades of HCl circulating slots, three grades of HCl circulating slots to prevent
Rotten layer.
Preferably, one-level HCl absorption tower, two grades of HCl absorption towers, three grades of HCl absorption towers all use temperature to be 20-30 DEG C
Circulating water cooling.
Preferably, one-level HCl absorption tower, two grades of HCl absorption towers, three grades of HCl absorption towers all use phenolic impregnated graphite material
Matter descending membrane-pipe type absorber, and bottom is all with gas-liquid separation chamber.
Preferably, one-level spray absorber uses common graphite material filler tower.
Preferably, the filler in one-level spray absorber is 250Y type pottery corrugated plate packing.
Preferably, the absorbing liquid in two grades of spray-absorption circulating slots delivers into two grades of sprays through two grades of spray-absorption circulating pumps
In pouring absorption tower.
Preferably, two grades of spray absorbers use metal material packed tower.
Preferably, the filler in two grades of spray absorbers is metal gauze corrugated plating.
Preferably, two grades of spray-absorption circulating slots are lined with furan Corrosion Protection of Fiber Reinforced Plastics layer.
Preferably, one-level HCl circulation extraction pump, two grades of HCl circulating pumps, three grades of HCl circulating pumps all use fluorine alloy pump.
Preferably, one-level HCl circulation extraction pump, two grades of HCl circulating pumps, three grades of HCl circulating pumps all use fluorine alloy magnetic force
Pump.
Aforesaid operations is uninterruptedly carried out continuously.
In above-mentioned benzene absorbing unit, the adsorbent in every benzene adsorber all experiences absorption, the saturated desorption that rolls off the production line, adsorbs
Step, cycle alternation.
Two-stage nitration tail gas after benzene absorption is processed by the present invention sends into absorption system of the present invention, major part HCl gas in tail gas
Being absorbed by liquid absorption, then after benzene absorption and two grades of spray-absorptions process, high-altitude discharges, and two-stage nitration vent gas treatment is complete；Select
Tap water or high purity water are absorbing liquid 4, can in a large number, the HCl gas that fully absorbs in two-stage nitration tail gas, and coordinate selection quality to divide
Number for 28-32wt% sodium hydrate aqueous solution or ammonia that ammonia content is 25-29wt% as the absorption of tail gas before the release of high-altitude
Liquid 5, can absorb HCl gas further, and treating capacity is big, and energy consumption is low, makes tail gas reach discharge standard；The byproduct hydrochloric acid obtained can
To sell, reduce production cost；Add fresh absorbing liquid 4 to one-level spray absorber, after absorbing HCl gas, flow into three grades of HCl
Circulating slot is uniformly mixed so as to obtain solution D as absorbing liquid 3, and absorbing liquid 3 flows into three grades of HCl circulating slots after absorbing HCl gas and is uniformly mixed so as to obtain
Solution C, overflow two grades of HCl circulating slots of entrance are as absorbing liquid 2, and absorbing liquid 2 flows into two grades of HCl circulating slots after absorbing HCl gas
Being uniformly mixed so as to obtain solution B, overflow entrance one-level HCl circulating slot, as absorbing liquid 1, flows back to one-level after absorbing liquid 1 re-absorption HCl gas
HCl circulating slot mixes, and finally circulates extraction pump extraction through one-level HCl, it is achieved device continuous and stable runs；To two grades of spray-absorptions
Circulating slot adds absorbing liquid 5, and in two grades of spray-absorption circulating pumps deliver into two grades of spray absorbers, absorbing liquid absorbs tail gas
After flow back to two grades of spray-absorption circulating slots and be uniformly mixed so as to obtain solution E, move in circles, until solution E absorb tail gas saturated after, through two grades
Spray-absorption circulating pump extraction is to waste water treatment process, it is achieved device continuous and stable runs；HCl circulates extraction pump, two grades of sprays
Absorbent recirculation pump can forced circulation, gas-liquid mixed effect is effectively ensured；Tail gas direct of travel of the present invention and absorbing liquid 1-4 are added excessive
Popular enter in opposite direction, tail gas direct of travel is contrary with absorbing liquid 5 direct of travel, it is ensured that fresh absorbing liquid and afterbody tail gas
Contact, reduce to greatest extent and tail gas needs remove constituent content；Set of device of the present invention can corresponding multiple stage chlorinator, operate bullet
Property is big；Present invention, avoiding existing independent exhaust treatment system, equipment is many and operates complicated, investment and high the asking of maintenance cost
Topic；Overall efficiency of the present invention is high and energy consumption is low, and operating cost is low, can accomplish safe and environment-friendly, nuisanceless to greatest extent.
Accompanying drawing explanation
Fig. 1 be a kind of benzene chloride production that the present invention proposes two-stage nitration tail gas in the flow chart of processing method of HCl.
Detailed description of the invention
Below, by specific embodiment, technical scheme is described in detail.
Embodiment 1
As shown in Figure 1:
The processing method of HCl in the two-stage nitration tail gas of a kind of benzene chloride production, comprises the following steps:
S1, benzene absorption is processed after two-stage nitration tail gas and one-level HCl circulating slot in absorbing liquid 1 enter one-level HCl in the same direction
In absorption tower, gas-liquid separation, liquid flows into one-level HCl circulating slot by pipeline, is uniformly mixed so as to obtain solution A, then follows through one-level HCl
Ring extraction pump extraction, removes benzene and obtains hydrochloric acid；Gas is gas A；
S2, the absorbing liquid 2 in the gas A obtained in S1 and two grades of HCl circulating slots is entered two grades of HCl absorption towers in the same direction
In, gas-liquid separation, liquid flows into two grades of HCl circulating slots by pipeline, is uniformly mixed so as to obtain solution B, and then overflow entrance one-level HCl is followed
Annular groove, gas is gas B；
S3, the absorbing liquid 3 in the gas B obtained in S2 and three grades of HCl circulating slots is entered three grades of HCl absorption towers in the same direction
In, gas-liquid separation, liquid flows into three grades of HCl circulating slots by pipeline, is uniformly mixed so as to obtain solution C, and then two grades of HCl of overflow entrance follow
Annular groove, gas is gas C；
The gas C that obtains in S4, S3 enter one-level spray absorber and with the reverse absorbing liquid 4 in one-level spray absorber
After contact absorbs, liquid flows into three grades of HCl circulating slots by pipeline, is uniformly mixed so as to obtain solution D, and gas is gas D；
The gas D that obtains in S5, S4 enter two grades of spray absorbers and with the absorbing liquid 5 in two grades of spray-absorption circulating slots
Inversely contacting absorption, liquid flows back to two grades of spray-absorption circulating slots, is uniformly mixed so as to obtain solution E；Residual gas is put by a pipeline high position
After sky, two-stage nitration vent gas treatment is complete.
Embodiment 2
As shown in Figure 1:
The processing method of HCl in the two-stage nitration tail gas of a kind of benzene chloride production, comprises the following steps:
S1, by temperature be the two-stage nitration tail gas after-11 DEG C of benzene absorptions process with the absorbing liquid 1 in one-level HCl circulating slot in the same direction
Entering in one-level HCl absorption tower, gas-liquid separation, liquid flows into one-level HCl circulating slot by pipeline, is uniformly mixed so as to obtain solution A, then
Circulate extraction pump extraction through one-level HCl, remove benzene and obtain hydrochloric acid；Gas is gas A, wherein, and the mass fraction of HCl in solution A
For 33wt%, the temperature of gas A is 55 DEG C, and absorbing liquid 1 is solution B；
S2, the absorbing liquid 2 in the gas A obtained in S1 and two grades of HCl circulating slots is entered two grades of HCl absorption towers in the same direction
In, gas-liquid separation, liquid flows into two grades of HCl circulating slots by pipeline, is uniformly mixed so as to obtain solution B, and then overflow entrance one-level HCl is followed
Annular groove, gas is gas B, and wherein, in solution B, the mass fraction of HCl is 8wt%, and the temperature of gas B is 30 DEG C, and absorbing liquid 2 is
Solution C；
S3, the absorbing liquid 3 in the gas B obtained in S2 and three grades of HCl circulating slots is entered three grades of HCl absorption towers in the same direction
In, gas-liquid separation, liquid flows into three grades of HCl circulating slots by pipeline, is uniformly mixed so as to obtain solution C, and then two grades of HCl of overflow entrance follow
Annular groove, gas is gas C, and wherein, in solution C, the mass fraction of HCl is 1.5wt%, and the temperature of gas C is 20 DEG C, absorbing liquid 3
For solution D；
The gas C that obtains in S4, S3 enter one-level spray absorber and with the reverse tap water in one-level spray absorber
After contact absorbs, liquid flows into three grades of HCl circulating slots by pipeline, is uniformly mixed so as to obtain solution D, and gas is gas D, wherein, and gas D
The mass fraction of middle HCl is 5ppm, and the absorbing liquid in one-level HCl circulating slot, two grades of HCl circulating slots, three grades of HCl circulating slots is respectively
Circulating extraction pump, two grades of HCl circulating pumps, three grades of HCl circulating pump conveyings through one-level HCl, one-level HCl respectively enteing correspondence absorbs
In tower, two grades of HCl absorption towers, three grades of HCl absorption towers, one-level HCl absorption tower, two grades of HCl absorption towers, three grades of HCl absorption towers are equal
Using temperature is the circulating water cooling of 30 DEG C, one-level HCl absorption tower, two grades of HCl absorption towers, three grades of HCl absorption towers bottom equal
With gas-liquid separation chamber；
The gas D that obtains in S5, S4 enter two grades of spray absorbers and with the absorbing liquid 5 in two grades of spray-absorption circulating slots
Inversely contacting absorption, liquid flows back to two grades of spray-absorption circulating slots, is uniformly mixed so as to obtain solution E；Residual gas is put by a pipeline high position
After sky, two-stage nitration vent gas treatment is complete, and wherein, absorbing liquid 5 is 28wt% sodium hydrate aqueous solution for mass fraction, and solution E absorbs tail
After gas is saturated, through two grades of spray-absorption circulating pump extraction to waste water treatment process, in residual gas, the mass fraction of HCl is
0.3ppm, the absorbing liquid in two grades of spray-absorption circulating slots delivers into two grades of spray absorbers through two grades of spray-absorption circulating pumps
In.
Embodiment 3
As shown in Figure 1:
The processing method of HCl in the two-stage nitration tail gas of a kind of benzene chloride production, comprises the following steps:
S1, it is that the two-stage nitration tail gas after-9 DEG C of benzene absorptions process enters in the same direction with the absorbing liquid 1 in one-level HCl circulating slot by temperature
Entering in one-level HCl absorption tower, gas-liquid separation, liquid flows into one-level HCl circulating slot by pipeline, is uniformly mixed so as to obtain solution A, then warp
The circulation extraction pump extraction of one-level HCl, removes benzene and obtains hydrochloric acid；Gas is gas A, and wherein, in solution A, the mass fraction of HCl is
31wt%, the temperature of gas A is 65 DEG C, and absorbing liquid 1 is solution B；
S2, the absorbing liquid 2 in the gas A obtained in S1 and two grades of HCl circulating slots is entered two grades of HCl absorption towers in the same direction
In, gas-liquid separation, liquid flows into two grades of HCl circulating slots by pipeline, is uniformly mixed so as to obtain solution B, and then overflow entrance one-level HCl is followed
Annular groove, gas is gas B, and wherein, in solution B, the mass fraction of HCl is 12wt%, and the temperature of gas B is 40 DEG C, absorbing liquid 2
For solution C；
S3, the absorbing liquid 3 in the gas B obtained in S2 and three grades of HCl circulating slots is entered three grades of HCl absorption towers in the same direction
In, gas-liquid separation, liquid flows into three grades of HCl circulating slots by pipeline, is uniformly mixed so as to obtain solution C, and then two grades of HCl of overflow entrance follow
Annular groove, gas is gas C, and wherein, in solution C, the mass fraction of HCl is 0.5wt%, and the temperature of gas C is 25 DEG C, absorbing liquid 3
For solution D；
The gas C that obtains in S4, S3 enter one-level spray absorber and with the reverse high purity water in one-level spray absorber
After contact absorbs, liquid flows into three grades of HCl circulating slots by pipeline, is uniformly mixed so as to obtain solution D, and gas is gas D, wherein, and gas D
The mass fraction of middle HCl is 10ppm, and the absorbing liquid in one-level HCl circulating slot, two grades of HCl circulating slots, three grades of HCl circulating slots is divided
Not circulating extraction pump, two grades of HCl circulating pumps, three grades of HCl circulating pump conveyings through one-level HCl, one-level HCl respectively enteing correspondence is inhaled
Receive in tower, two grades of HCl absorption towers, three grades of HCl absorption towers, one-level HCl absorption tower, two grades of HCl absorption towers, three grades of HCl absorption towers
The circulating water cooling all using temperature to be 20 DEG C, one-level HCl absorption tower, two grades of HCl absorption towers, bottoms on three grades of HCl absorption towers
All with gas-liquid separation chamber；
The gas D that obtains in S5, S4 enter two grades of spray absorbers and with the absorbing liquid 5 in two grades of spray-absorption circulating slots
Inversely contacting absorption, liquid flows back to two grades of spray-absorption circulating slots, is uniformly mixed so as to obtain solution E；Residual gas is put by a pipeline high position
After sky, two-stage nitration vent gas treatment is complete, and wherein, absorbing liquid 5 is 32wt% sodium hydrate aqueous solution for mass fraction, and solution E absorbs tail
After gas is saturated, through two grades of spray-absorption circulating pump extraction to waste water treatment process, in residual gas, the mass fraction of HCl is
0.5ppm, the absorbing liquid in two grades of spray-absorption circulating slots delivers into two grades of spray absorbers through two grades of spray-absorption circulating pumps
In.
Embodiment 4
As shown in Figure 1:
The processing method of HCl in the two-stage nitration tail gas of a kind of benzene chloride production, comprises the following steps:
S1, be two-stage nitration tail gas after-10.5 DEG C of benzene absorptions process by temperature with the absorbing liquid 1 in one-level HCl circulating slot with
To entering in one-level HCl absorption tower, gas-liquid separation, liquid flows into one-level HCl circulating slot by pipeline, is uniformly mixed so as to obtain solution A, so
Circulate extraction pump extraction by one-level HCl, remove benzene and obtain hydrochloric acid；Gas is gas A, and wherein, in solution A, the quality of HCl is divided
Number is 32.5wt%, and the temperature of gas A is 58 DEG C, and absorbing liquid 1 is solution B；
S2, the absorbing liquid 2 in the gas A obtained in S1 and two grades of HCl circulating slots is entered two grades of HCl absorption towers in the same direction
In, gas-liquid separation, liquid flows into two grades of HCl circulating slots by pipeline, is uniformly mixed so as to obtain solution B, and then overflow entrance one-level HCl is followed
Annular groove, gas is gas B, and wherein, in solution B, the mass fraction of HCl is 9wt%, and the temperature of gas B is 33 DEG C, and absorbing liquid 2 is
Solution C；
S3, the absorbing liquid 3 in the gas B obtained in S2 and three grades of HCl circulating slots is entered three grades of HCl absorption towers in the same direction
In, gas-liquid separation, liquid flows into three grades of HCl circulating slots by pipeline, is uniformly mixed so as to obtain solution C, and then two grades of HCl of overflow entrance follow
Annular groove, gas is gas C, and wherein, in solution C, the mass fraction of HCl is 1.2wt%, and the temperature of gas C is 21 DEG C, absorbing liquid 3
For solution D；
The gas C that obtains in S4, S3 enter one-level spray absorber and with the reverse tap water in one-level spray absorber
After contact absorbs, liquid flows into three grades of HCl circulating slots by pipeline, is uniformly mixed so as to obtain solution D, and gas is gas D, wherein, and gas D
The mass fraction of middle HCl is 6ppm, and the absorbing liquid in one-level HCl circulating slot, two grades of HCl circulating slots, three grades of HCl circulating slots is respectively
Circulating extraction pump, two grades of HCl circulating pumps, three grades of HCl circulating pump conveyings through one-level HCl, one-level HCl respectively enteing correspondence absorbs
In tower, two grades of HCl absorption towers, three grades of HCl absorption towers, one-level HCl absorption tower, two grades of HCl absorption towers, three grades of HCl absorption towers are equal
Using temperature is the circulating water cooling of 27 DEG C, one-level HCl absorption tower, two grades of HCl absorption towers, three grades of HCl absorption towers bottom equal
With gas-liquid separation chamber；
The gas D that obtains in S5, S4 enter two grades of spray absorbers and with the absorbing liquid 5 in two grades of spray-absorption circulating slots
Inversely contacting absorption, liquid flows back to two grades of spray-absorption circulating slots, is uniformly mixed so as to obtain solution E；Residual gas is put by a pipeline high position
After sky, two-stage nitration vent gas treatment is complete, and wherein, absorbing liquid 5 is the ammonia of 25wt% for ammonia content, after solution E absorption tail gas is saturated,
Through two grades of spray-absorption circulating pump extraction to waste water treatment process, in residual gas, the mass fraction of HCl is 0.45ppm, two grades
Absorbing liquid in spray-absorption circulating slot is in two grades of spray-absorption circulating pumps deliver into two grades of spray absorbers.
Embodiment 5
As shown in Figure 1:
The processing method of HCl in the two-stage nitration tail gas of a kind of benzene chloride production, comprises the following steps:
S1, by temperature be the two-stage nitration tail gas after-9.5 DEG C of benzene absorptions process with the absorbing liquid 1 in one-level HCl circulating slot in the same direction
Entering in one-level HCl absorption tower, gas-liquid separation, liquid flows into one-level HCl circulating slot by pipeline, is uniformly mixed so as to obtain solution A, then
Circulate extraction pump extraction through one-level HCl, remove benzene and obtain hydrochloric acid；Gas is gas A, wherein, and the mass fraction of HCl in solution A
For 31.5wt%, the temperature of gas A is 62 DEG C, and absorbing liquid 1 is solution B；
S2, the absorbing liquid 2 in the gas A obtained in S1 and two grades of HCl circulating slots is entered two grades of HCl absorption towers in the same direction
In, gas-liquid separation, liquid flows into two grades of HCl circulating slots by pipeline, is uniformly mixed so as to obtain solution B, and then overflow entrance one-level HCl is followed
Annular groove, gas is gas B, and wherein, in solution B, the mass fraction of HCl is 11wt%, and the temperature of gas B is 37 DEG C, absorbing liquid 2
For solution C；
S3, the absorbing liquid 3 in the gas B obtained in S2 and three grades of HCl circulating slots is entered three grades of HCl absorption towers in the same direction
In, gas-liquid separation, liquid flows into three grades of HCl circulating slots by pipeline, is uniformly mixed so as to obtain solution C, and then two grades of HCl of overflow entrance follow
Annular groove, gas is gas C, and wherein, in solution C, the mass fraction of HCl is 0.8wt%, and the temperature of gas C is 23 DEG C, absorbing liquid 3
For solution D；
The gas C that obtains in S4, S3 enter one-level spray absorber and with the reverse high purity water in one-level spray absorber
After contact absorbs, liquid flows into three grades of HCl circulating slots by pipeline, is uniformly mixed so as to obtain solution D, and gas is gas D, wherein, and gas D
The mass fraction of middle HCl is 8ppm, and the absorbing liquid in one-level HCl circulating slot, two grades of HCl circulating slots, three grades of HCl circulating slots is respectively
Circulating extraction pump, two grades of HCl circulating pumps, three grades of HCl circulating pump conveyings through one-level HCl, one-level HCl respectively enteing correspondence absorbs
In tower, two grades of HCl absorption towers, three grades of HCl absorption towers, one-level HCl absorption tower, two grades of HCl absorption towers, three grades of HCl absorption towers are equal
Using temperature is the circulating water cooling of 23 DEG C, one-level HCl absorption tower, two grades of HCl absorption towers, three grades of HCl absorption towers bottom equal
With gas-liquid separation chamber；
The gas D that obtains in S5, S4 enter two grades of spray absorbers and with the absorbing liquid 5 in two grades of spray-absorption circulating slots
Inversely contacting absorption, liquid flows back to two grades of spray-absorption circulating slots, is uniformly mixed so as to obtain solution E；Residual gas is put by a pipeline high position
After sky, two-stage nitration vent gas treatment is complete, and wherein, absorbing liquid 5 is the ammonia of 29wt% for ammonia content, after solution E absorption tail gas is saturated,
Through two grades of spray-absorption circulating pump extraction to waste water treatment process, in residual gas, the mass fraction of HCl is 0.35ppm, two grades
Absorbing liquid in spray-absorption circulating slot is in two grades of spray-absorption circulating pumps deliver into two grades of spray absorbers.
Embodiment 6
As shown in Figure 1:
The processing method of HCl in the two-stage nitration tail gas of a kind of benzene chloride production, comprises the following steps:
S1, by temperature be the two-stage nitration tail gas after-10 DEG C of benzene absorptions process with the absorbing liquid 1 in one-level HCl circulating slot in the same direction
Entering in one-level HCl absorption tower, gas-liquid separation, liquid flows into one-level HCl circulating slot by pipeline, is uniformly mixed so as to obtain solution A, then
Circulate extraction pump extraction through one-level HCl, remove benzene and obtain hydrochloric acid；Gas is gas A, wherein, and the mass fraction of HCl in solution A
For 32wt%, the temperature of gas A is 60 DEG C, and absorbing liquid 1 is solution B；
S2, the absorbing liquid 2 in the gas A obtained in S1 and two grades of HCl circulating slots is entered two grades of HCl absorption towers in the same direction
In, gas-liquid separation, liquid flows into two grades of HCl circulating slots by pipeline, is uniformly mixed so as to obtain solution B, and then overflow entrance one-level HCl is followed
Annular groove, gas is gas B, and wherein, in solution B, the mass fraction of HCl is 10wt%, and the temperature of gas B is 35 DEG C, absorbing liquid 2
For solution C；
S3, the absorbing liquid 3 in the gas B obtained in S2 and three grades of HCl circulating slots is entered three grades of HCl absorption towers in the same direction
In, gas-liquid separation, liquid flows into three grades of HCl circulating slots by pipeline, is uniformly mixed so as to obtain solution C, and then two grades of HCl of overflow entrance follow
Annular groove, gas is gas C, and wherein, in solution C, the mass fraction of HCl is 1wt%, and the temperature of gas C is 22 DEG C, and absorbing liquid 3 is
Solution D；
The gas C that obtains in S4, S3 enter one-level spray absorber and with the reverse tap water in one-level spray absorber
After contact absorbs, liquid flows into three grades of HCl circulating slots by pipeline, is uniformly mixed so as to obtain solution D, and gas is gas D, wherein, and gas D
The mass fraction of HCl is 7ppm, the absorbing liquid warp respectively in one-level HCl circulating slot, two grades of HCl circulating slots, three grades of HCl circulating slots
One-level HCl circulation extraction pump, two grades of HCl circulating pumps, three grades of HCl circulating pump conveyings, one-level HCl respectively enteing correspondence absorbs
In tower, two grades of HCl absorption towers, three grades of HCl absorption towers, one-level HCl absorption tower, two grades of HCl absorption towers, three grades of HCl absorption towers are equal
Using temperature is the circulating water cooling of 25 DEG C, one-level HCl absorption tower, two grades of HCl absorption towers, three grades of HCl absorption towers bottom equal
With gas-liquid separation chamber；
The gas D that obtains in S5, S4 enter two grades of spray absorbers and with the absorbing liquid 5 in two grades of spray-absorption circulating slots
Inversely contacting absorption, liquid flows back to two grades of spray-absorption circulating slots, is uniformly mixed so as to obtain solution E；Residual gas is put by a pipeline high position
After sky, two-stage nitration vent gas treatment is complete, and wherein, absorbing liquid 5 is 30wt% sodium hydrate aqueous solution for mass fraction, and solution E absorbs tail
After gas is saturated, through two grades of spray-absorption circulating pump extraction to waste water treatment process, in residual gas, the mass fraction of HCl is
0.4ppm, the absorbing liquid in two grades of spray-absorption circulating slots delivers into two grades of spray absorbers through two grades of spray-absorption circulating pumps
In.
The above, the only present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto,
Any those familiar with the art in the technical scope that the invention discloses, according to technical scheme and
Inventive concept equivalent or change in addition, all should contain within protection scope of the present invention.
Claims (10)
1. the processing method of HCl in the two-stage nitration tail gas of a benzene chloride production, it is characterised in that comprise the following steps:
S1, benzene absorption is processed after two-stage nitration tail gas and one-level HCl circulating slot in absorbing liquid 1 enters the absorption of one-level HCl in the same direction
In tower, gas-liquid separation, liquid flows into one-level HCl circulating slot by pipeline, is uniformly mixed so as to obtain solution A, then adopts through the circulation of one-level HCl
Go out pump extraction, remove benzene and obtain hydrochloric acid；Gas is gas A；
S2, the absorbing liquid 2 in the gas A obtained in S1 and two grades of HCl circulating slots is entered in two grades of HCl absorption towers in the same direction, gas
Liquid separates, and liquid flows into two grades of HCl circulating slots by pipeline, is uniformly mixed so as to obtain solution B, and then overflow enters one-level HCl circulating slot,
Gas is gas B；
S3, the absorbing liquid 3 in the gas B obtained in S2 and three grades of HCl circulating slots is entered in three grades of HCl absorption towers in the same direction, gas
Liquid separates, and liquid flows into three grades of HCl circulating slots by pipeline, is uniformly mixed so as to obtain solution C, and then overflow enters two grades of HCl circulating slots,
Gas is gas C；
The gas C obtained in S4, S3 enters one-level spray absorber and contacts with the reverse absorbing liquid 4 in one-level spray absorber
After absorption, liquid flows into three grades of HCl circulating slots by pipeline, is uniformly mixed so as to obtain solution D, and gas is gas D；
The gas D that obtains in S5, S4 enters two grades of spray absorbers reverse with the absorbing liquid 5 in two grades of spray-absorption circulating slots
Contact absorbs, and liquid flows back to two grades of spray-absorption circulating slots, is uniformly mixed so as to obtain solution E；After residual gas is vented by a pipeline high position
Two-stage nitration vent gas treatment is complete.
The processing method of HCl in the two-stage nitration tail gas of benzene chloride production the most according to claim 1, it is characterised in that in S1,
The temperature of the two-stage nitration tail gas after benzene absorption process is-11 to-9 DEG C.
The processing method of HCl in the two-stage nitration tail gas of benzene chloride production the most according to claim 1 or claim 2, it is characterised in that at S1
In, in solution A, the mass fraction of HCl is 31-33wt%；Preferably, in S1, the temperature of gas A is 55-65 DEG C.
4., according to the processing method of HCl in the two-stage nitration tail gas of benzene chloride production described in any one of claim 1-3, its feature exists
In, in S2, in solution B, the mass fraction of HCl is 8-12wt%；Preferably, in S2, the temperature of gas B is 30-40 DEG C.
5., according to the processing method of HCl in the two-stage nitration tail gas of benzene chloride production described in any one of claim 1-4, its feature exists
In, in S3, in solution C, the mass fraction of HCl is 0.5-1.5wt%；Preferably, in S3, the temperature of gas C is 20-25
℃；Preferably, in S4, the mass fraction≤10ppm of HCl in gas D；Preferably, in S5, to follow to two grades of spray-absorptions
Annular groove periodically adds supplementary absorbing liquid；Preferably, in S5, after solution E absorption tail gas is saturated, through two grades of spray-absorption circulating pumps
Extraction is to waste water treatment process；Preferably, in S5, the mass fraction≤0.5ppm of HCl in residual gas.
6., according to the processing method of HCl in the two-stage nitration tail gas of benzene chloride production described in any one of claim 1-5, its feature exists
In, absorbing liquid 5 for mass fraction is 28-32wt% sodium hydrate aqueous solution or ammonia that ammonia content is 25-29wt% one
Kind；Preferably, absorbing liquid 4 is the one in tap water or high purity water；Preferably, absorbing liquid 3 is solution D；Preferably, absorbing liquid
2 is solution C；Preferably, absorbing liquid 1 is solution B.
7., according to the processing method of HCl in the two-stage nitration tail gas of benzene chloride production described in any one of claim 1-6, its feature exists
In, the absorbing liquid in one-level HCl circulating slot, two grades of HCl circulating slots, three grades of HCl circulating slots circulates extraction through one-level HCl respectively
Pump, two grades of HCl circulating pumps, three grades of HCl circulating pumps conveyings, respectively enter the one-level HCl absorption tower of correspondence, two grades of HCl absorption towers,
In three grades of HCl absorption towers；Preferably, phenolic aldehyde all it is lined with in one-level HCl circulating slot, two grades of HCl circulating slots, three grades of HCl circulating slots
Corrosion Protection of Fiber Reinforced Plastics layer.
8., according to the processing method of HCl in the two-stage nitration tail gas of benzene chloride production described in any one of claim 1-7, its feature exists
In, the circulating water cooling that one-level HCl absorption tower, two grades of HCl absorption towers, three grades of HCl absorption towers all use temperature to be 20-30 DEG C；
Preferably, one-level HCl absorption tower, two grades of HCl absorption towers, three grades of HCl absorption towers all use phenolic impregnated graphite material film supplying tube
Formula absorber, and bottom is all with gas-liquid separation chamber.
9., according to the processing method of HCl in the two-stage nitration tail gas of benzene chloride production described in any one of claim 1-8, its feature exists
In, one-level spray absorber uses common graphite material filler tower；Preferably, the filler in one-level spray absorber is 250Y type
Pottery corrugated plate packing；Preferably, the absorbing liquid in two grades of spray-absorption circulating slots is delivered into through two grades of spray-absorption circulating pumps
Enter in two grades of spray absorbers；Preferably, two grades of spray absorbers use metal material packed tower；Preferably, two grades of sprays are inhaled
The filler received in tower is metal gauze corrugated plating；Preferably, two grades of spray-absorption circulating slots are lined with furan Corrosion Protection of Fiber Reinforced Plastics layer.
10., according to the processing method of HCl in the two-stage nitration tail gas of benzene chloride production described in any one of claim 1-9, its feature exists
In, one-level HCl circulation extraction pump, two grades of HCl circulating pumps, three grades of HCl circulating pumps all use fluorine alloy pump；Preferably, one-level HCl
Circulation extraction pump, two grades of HCl circulating pumps, three grades of HCl circulating pumps all use fluorine alloy magnetic drive pump.
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| JPS56168820A (en) * | 1980-05-29 | 1981-12-25 | Toyota Motor Corp | Deodorization device for waste gas of urethane curing oven |
| CN202638263U (en) * | 2012-07-11 | 2013-01-02 | 宿迁科思化学有限公司 | Tail gas absorption device |
| CN104096468A (en) * | 2014-06-07 | 2014-10-15 | 李安民 | Tail gas absorption process and equipment for bis(trichloromethyl)carbonate production |
| CN105363321A (en) * | 2015-11-20 | 2016-03-02 | 太仓市振锋化工设备有限公司 | Hydrogen chloride gas absorption device |
-
2016
- 2016-08-03 CN CN201610630707.XA patent/CN106215624A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56168820A (en) * | 1980-05-29 | 1981-12-25 | Toyota Motor Corp | Deodorization device for waste gas of urethane curing oven |
| CN202638263U (en) * | 2012-07-11 | 2013-01-02 | 宿迁科思化学有限公司 | Tail gas absorption device |
| CN104096468A (en) * | 2014-06-07 | 2014-10-15 | 李安民 | Tail gas absorption process and equipment for bis(trichloromethyl)carbonate production |
| CN105363321A (en) * | 2015-11-20 | 2016-03-02 | 太仓市振锋化工设备有限公司 | Hydrogen chloride gas absorption device |
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Application publication date: 20161214 |