CN110252088A - The recovery system of aniline in a kind of tail gas - Google Patents
The recovery system of aniline in a kind of tail gas Download PDFInfo
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- CN110252088A CN110252088A CN201910553704.4A CN201910553704A CN110252088A CN 110252088 A CN110252088 A CN 110252088A CN 201910553704 A CN201910553704 A CN 201910553704A CN 110252088 A CN110252088 A CN 110252088A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0057—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0078—Condensation of vapours; Recovering volatile solvents by condensation characterised by auxiliary systems or arrangements
- B01D5/009—Collecting, removing and/or treatment of the condensate
-
- 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
- B01D53/002—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 condensation
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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
-
- 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
- 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
- B01D53/1431—Pretreatment by other processes
-
- 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
- B01D53/1487—Removing organic compounds
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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
- B01D53/1493—Selection of liquid materials for use as absorbents
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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
- B01D53/18—Absorbing units; Liquid distributors therefor
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
- C07C209/82—Purification; Separation; Stabilisation; Use of additives
- C07C209/86—Separation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/20—Organic absorbents
- B01D2252/202—Alcohols or their derivatives
- B01D2252/2021—Methanol
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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
- B01D2257/40—Nitrogen compounds
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The present invention relates to technology for absorbing tail gas fields, more specifically, it is related to a kind of recovery system of aniline in tail gas, including condenser, liquid collecting tank, high-efficiency multi-stage spray absorber, aniline water storage tank, alcohol water storage tank, aniline recovery storage tank, aniline dehydrating tower and tail gas station burning disposal.Exhaust gas containing aniline enters tail gas condenser through pipeline, and the liquid being condensed is collected into liquid collecting tank；Then tail gas enters in high-efficiency multi-stage spray column, using low concentration methanol water as absorbent, enhances assimilation effect, tower bottom absorbing liquid leads to aniline dehydrating tower and carries out aniline recovery, and tower top alcohol water leads to spray column recycling；Spray column exit gas leads to tail gas station and carries out burning disposal；The present invention has rational design, processing is large-minded, stable.It realizes most aniline recoveries in tail gas to utilize, reduces the consumption of raw material, reduce production cost, generate economic benefit；Vent gas treatment operating cost is reduced simultaneously.
Description
Technical field
The present invention relates to technology for absorbing tail gas fields, more specifically, are related to a kind of recovery system of aniline in tail gas.
Background technique
Aniline is one of most most important amine substance, is most important intermediate and production pesticide in dye industry
Important source material.In relevant Chemical Manufacture, the tail gas containing aniline, which directly empties, will cause environmental pollution, while be also very
The pollution sources that hardly possible is thoroughly handled.
Summary of the invention
The purpose of the present invention is to provide a kind of recovery system of aniline in tail gas, can effectively recycle most of in tail gas
Aniline reduces production cost, generates objective economic benefit；It also reduces simultaneously as vent gas treatment operating load.
In order to achieve the above objectives, technical solution provided by the invention are as follows:
The recovery system of aniline in a kind of tail gas, which includes tail gas condenser, liquid collecting tank, multi-stage spray absorption tower, aniline
Water storage tank, alcohol water storage tank, aniline recovery storage tank, aniline dehydrating tower and offgas outlet；Tail gas containing aniline enters through inlet exhaust gas
Tail gas condenser, condensate liquid enters liquid collecting tank after condensing, and uncondensed gas enters multi-stage spray absorption tower, inhales in multi-stage spray
It receives in tower, using methanol-water as absorbent, the methanol-water is stored in alcohol water storage tank, and alcohol water storage tank is incited somebody to action by elevator pump
Methanol-water is promoted to multi-stage spray absorption tower top alcohol inlet, is recycled into multi-stage spray absorption tower, enhances degree of absorption；
Gas leads to tail gas station progress burning disposal in the outlet of multi-stage spray tail gas from absorption tower.
Further, the tail gas condenser uses horizontal condenser, reduces difficulty of construction, is guaranteeing its condensation effect
Under the premise of, tail gas walks tube side, reduces gas in pipelines resistance, increases treating capacity.
Further, material in tank is periodically delivered to aniline water storage tank with pump by liquid in the liquid collecting tank.
Further, the methanol-water is 10% methanol aqueous solution.
Further, the multi-stage spray absorption tower includes level-one spray column and second level spray column, the level-one spray column
Gas outlet connects second level spray column air inlet, and second level spray column gas outlet leads to vent gas treatment station, the level-one spray column and two
In lower part, gas outlet is arranged on top for the air inlet setting of grade spray column.
Further, the level-one spray column and second level spray column tower are provided with stainless steel plate ripple packing enhancing spray
Tower assimilation effect, level-one spray column and second level spray column overhead end alcohol inlet use spiral nozzle, make methanol-water in atomization enhancing
Spraying effect, tower internal upper part are provided with spray column overhead demister, and bottom is provided with spray column sink.
Further, the spray column sink is equipped with condenser coil, cools down to the water for absorbing aniline；In spray column sink
Condensate liquid output uses delivery pump, and wherein feed-line is divided into two-way, and pipeline flow uses valve controlling flow amount, controls all the way
40% is delivered in aniline water storage tank, and it is very useful in recycling in tower that another way control 60% is delivered to multi-stage spray absorbing tower, guarantees
The degree of saturation of absorbing liquid.
Further, the liquid in the spray column sink for recycling in tower enters multistage spray by two grades of sprays of height
Absorption tower is drenched, spray flow is controlled using valve, eminence water spray amount is 1/3, and lower water spray amount is 2/3.
Further, the crude product aniline that aniline bottom settles in the aniline water storage tank is delivered to aniline dehydrating tower and carries out benzene
Amine recycling；The crude product aniline that aniline bottom settles in aniline water storage tank is delivered to pre- through aniline water preheater before aniline dehydrating tower
Heat；The aniline of the aniline dehydration tower bottom is delivered in aniline recovery storage tank after the condensation of aniline condenser；Aniline dehydrating tower
The aniline water that top of tower distills out is delivered in aniline water pot through aniline water condenser, gas-liquid separator to be settled, gas-liquid point
Enter vacuum pump set after vacuum buffer tank from device gas；Aqueous amine storage tank top is equipped with overflow port, and supernatant after settlement is
Methanol is mixed with water, and methanol-water overflow carries out spray again into alcohol water pot and applies.
Further, 70-100 DEG C of the aniline dehydration column overhead temperature, column bottom temperature are 100-110 DEG C, top vacuum
Degree is -0.08-0.096MPa, and reboiler temperature is 105-115 DEG C.
Compared with prior art, the advantageous effect of present invention is that:
The present invention provides a kind of recovery systems of aniline in tail gas, and taking absorbing liquid is low concentration methanol aqueous solution, greatly
Enhance its absorb aniline ability, can be with aniline in efficient absorption tail gas；Aniline dehydrating tower realizes the recycling of aniline, reduces
Production cost generates economic benefit；Residual gas realizes tail gas cleaning discharge after burning simultaneously.
Detailed description of the invention
Fig. 1 is the recovery system schematic diagram of aniline in a kind of tail gas provided by the invention.
In figure: 1 be inlet exhaust gas, 2 be tail gas condenser, 3 be liquid collecting tank, 4 be level-one spray column, 5 be second level spray column,
6 be spray column overhead demister, 7 be spray column sink, 8 be aniline water storage tank, 9 be alcohol water storage tank, 10 be aniline recovery storage tank,
11 be spray column outlet surge tank, 12 for lead to vent gas treatment station burning disposal, 13 be aniline dehydrating tower, 14 be aniline water preheating
Device, 15 be reboiler, 16 be aniline condenser, 17 be aniline water condenser, 18 be vacuum buffer tank, 19 be gas-liquid separator,
20 it is tail gas condenser cooling circulating water inlet, 21 be tail gas condenser cooling circulating water outlet, 22 be vacuum pump set, 23 is benzene
Amine condenser circulating cooling water inlet, 24 be aniline condenser circulating cooling water out, 25 be reboiler steam import, 26 for again
Boiling device steam (vapor) outlet, 27 be aniline water preheater steam inlet, 28 be aniline water preheater steam (vapor) outlet.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, in a kind of tail gas aniline recovery system, which includes tail gas condenser 2, liquid collecting tank 3, multistage
Spray absorber, aniline water storage tank 8, alcohol water storage tank 9, aniline recovery storage tank 10, aniline dehydrating tower 13 and offgas outlet 12；Contain
Aniline tail gas enters tail gas condenser 2 through inlet exhaust gas 1, and condensate liquid enters liquid collecting tank 3 after condensing, and uncondensed gas enters more
Grade spray absorber, in multi-stage spray absorption tower, using methanol-water as absorbent, the methanol-water is stored in alcohol water storage tank
In 9, methanol-water is promoted to multi-stage spray absorption tower top alcohol inlet by elevator pump by alcohol water storage tank 9, into multi-stage spray
Absorption tower is recycled；Gas leads to tail gas station progress burning disposal in multi-stage spray tail gas from absorption tower outlet 12.
Further, the tail gas condenser 2 uses horizontal condenser, and tail gas enters tail gas condenser through inlet exhaust gas 1
2, tail gas walks tube side, and condensed water passes through shell side to tail gas condensing through tail gas condenser cooling circulating water inlet 20, and condensed water is through tail
Gas condenser cooling circulating water outlet 21 is discharged.
Further, material in tank is periodically delivered to aniline water storage tank 8 with pump by liquid in the liquid collecting tank 3.
Further, the multi-stage spray absorption tower includes level-one spray column 4 and second level spray column 5, the level-one spray
4 gas outlet of tower connects 5 air inlet of second level spray column, and level-one spray column is provided with spray column outlet surge tank at 4 top gas outlet
11；Vent gas treatment station is led in 5 gas outlet of second level spray column.
Further, the level-one spray column 4 and 5 tower of second level spray column are provided with stainless steel plate ripple packing, level-one
Spray column 4 and 5 tower top end alcohol inlet of second level spray column use spiral nozzle, and tower internal upper part is provided with spray column overhead demister 6,
Tower top demister 6 is located on the downside of gas outlet, and bottom is provided with spray column sink 7.
Further, the methanol-water is 10% methanol aqueous solution.
Further, the spray column sink 7 is equipped with condenser coil, and condensate liquid output is using conveying in spray column sink 7
Pump, wherein feed-line is divided into two-way, and pipeline flow uses valve controlling flow amount, controls 40% all the way and is delivered to aniline water storage tank 8
In, it is very useful in recycling in tower that another way control 60% is delivered to multi-stage spray absorbing tower.
Liquid in the spray column sink 7 for recycling in tower enters multi-stage spray by two grades of sprays of height and absorbs
Tower controls spray flow using valve, and eminence water spray amount is 1/3, and lower water spray amount is 2/3.
Further, in the aniline water storage tank 8 aniline bottom settle crude product aniline be delivered to aniline dehydrating tower 13 into
Row aniline recovery.
Further, in the aniline water storage tank 8 aniline bottom settle crude product aniline be delivered to aniline dehydrating tower 13 into
Row aniline recovery；The crude product aniline that aniline bottom settles in aniline water storage tank 8 is delivered to pre- through aniline water before aniline dehydrating tower 13
Hot device 14 preheats, and it is pre- for steam input, aniline water that aniline water preheater steam inlet 27 is provided on aniline water preheater 14
Hot device steam (vapor) outlet 28 is exported for steam；The aniline of the aniline dehydration tower bottom is delivered to after the condensation of aniline condenser 16
In aniline recovery storage tank 10, aniline condenser 16 be provided with aniline condenser circulating cooling water inlet 23 for cooling water input,
Aniline condenser circulating cooling water out 24 is exported for cooling water；The aniline water that 13 top of tower of aniline dehydrating tower distills out is through benzene
Aqueous amine condenser 17, gas-liquid separator 19 are delivered in aniline water pot and are settled, and 19 gas of gas-liquid separator is through vacuum buffer
Enter vacuum pump set 22 after tank 18；8 top of aniline water storage tank is equipped with overflow port, and supernatant after settlement is that methanol and water are mixed
It closes, methanol-water overflow carries out spray again into alcohol water pot 9 and applies.
Further, 70-100 DEG C of 13 tower top temperature of aniline dehydrating tower, column bottom temperature are 100-110 DEG C, and tower top is true
Reciprocal of duty cycle is -0.08-0.096MPa, and 15 temperature of reboiler is 105-115 DEG C, is provided with reboiler steam import 25 on reboiler 15
It is exported for steam input, reboiler steam outlet 26 for steam.
Only presently preferred embodiments of the present invention is explained in detail above, but the present invention is not limited to above-described embodiment,
Within the knowledge of a person skilled in the art, it can also make without departing from the purpose of the present invention each
Kind variation, various change should all be included in the protection scope of the present invention.
Claims (10)
1. the recovery system of aniline in a kind of tail gas, it is characterised in that: the system include tail gas condenser (2), liquid collecting tank (3),
Multi-stage spray absorption tower, aniline water storage tank (8), alcohol water storage tank (9), aniline recovery storage tank (10), aniline dehydrating tower (13) and
Offgas outlet (12)；Tail gas containing aniline enters tail gas condenser (2) through inlet exhaust gas (1), and condensate liquid enters liquid collecting after condensing
Tank (3), uncondensed gas enter multi-stage spray absorption tower, in multi-stage spray absorption tower, using methanol-water as absorbent, institute
It states methanol-water to be stored in alcohol water storage tank (9), methanol-water is promoted to multi-stage spray absorption by elevator pump by alcohol water storage tank (9)
Tower top end alcohol inlet is recycled into multi-stage spray absorption tower；Gas leads in multi-stage spray tail gas from absorption tower outlet (12)
Tail gas station carries out burning disposal.
2. the recovery system of aniline in a kind of tail gas according to claim 1, it is characterised in that: the tail gas condenser
(2) horizontal condenser is used, tail gas walks tube side.
3. the recovery system of aniline in a kind of tail gas according to claim 1, it is characterised in that: in the liquid collecting tank (3)
Material in tank is periodically delivered to aniline water storage tank (8) with pump by liquid.
4. the recovery system of aniline in a kind of tail gas according to claim 1, it is characterised in that: the methanol-water is 10%
Methanol aqueous solution.
5. the recovery system of aniline in a kind of tail gas according to claim 1, it is characterised in that: the multi-stage spray absorbs
Tower includes level-one spray column (4) and second level spray column (5), level-one spray column (4) gas outlet connection second level spray column (5) into
Vent gas treatment station is led in port, second level spray column (5) gas outlet；The air inlet of the level-one spray column (4) and second level spray column (5)
Mouth setting is arranged in lower part, gas outlet on top.
6. the recovery system of aniline in a kind of tail gas according to claim 5, it is characterised in that: the level-one spray column
(4) and second level spray column (5) tower is provided with stainless steel plate ripple packing, level-one spray column (4) and second level spray column (5) tower top
Alcohol inlet is held to use spiral nozzle, tower internal upper part is provided with spray column overhead demister (6), and bottom is provided with spray column sink
(7).
7. the recovery system of aniline in a kind of tail gas according to claim 5, it is characterised in that: the spray column sink
(7) it is equipped with condenser coil, liquid output uses delivery pump in spray column sink (7), and wherein feed-line is divided into two-way, pipeline stream
Amount uses valve controlling flow amount, controls 40% all the way and is delivered in aniline water storage tank (8), and another way control 60% is delivered to multistage spray
Leaching absorbing tower is very useful in recycling in tower.
8. the recovery system of aniline in a kind of tail gas according to claim 8, it is characterised in that: the spray column sink
(7) liquid in for recycling in tower enters multi-stage spray absorption tower by two grades of sprays of height, controls spray flow using valve,
Eminence water spray amount is 1/3, and lower water spray amount is 2/3.
9. the recovery system of aniline in a kind of tail gas according to claim 1, it is characterised in that: the aniline water storage tank
(8) the crude product aniline that aniline bottom settles in is delivered to aniline dehydrating tower (13) and carries out aniline recovery；Benzene in aniline water storage tank (8)
The crude product aniline of amine bottom sedimentation preheats before being delivered to aniline dehydrating tower (13) through aniline water preheater (14)；The aniline dehydration
The aniline of tower bottom is delivered in aniline recovery storage tank (10) after aniline condenser (16) condense；Aniline dehydrating tower (13) tower top
The aniline water that portion distills out is delivered in aniline water pot and is settled through aniline water condenser (17), gas-liquid separator (19), gas
Liquid/gas separator (19) gas enters vacuum pump set (22) after vacuum buffer tank (18)；Aqueous amine storage tank (8) top is equipped with overflow port,
Supernatant after settlement is that methanol is mixed with water, and methanol-water overflow carries out spray again into alcohol water pot (9) and applies.
10. the recovery system of aniline in a kind of tail gas according to claim 9, it is characterised in that: the aniline dehydrating tower
(13) 70-100 DEG C of tower top temperature, column bottom temperature are 100-110 DEG C, and top vacuum degree is -0.08-0.096MPa, reboiler
(15) temperature is 105-115 DEG C.
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| CN201910553704.4A CN110252088B (en) | 2019-06-25 | 2019-06-25 | Recovery system of aniline in tail gas |
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| CN201910553704.4A CN110252088B (en) | 2019-06-25 | 2019-06-25 | Recovery system of aniline in tail gas |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112265972A (en) * | 2020-11-13 | 2021-01-26 | 西安近代化学研究所 | Method for recycling inert carrier gas in ethylene imine production |
| CN112870922A (en) * | 2021-01-21 | 2021-06-01 | 山东宏原环保科技有限公司 | Method for purifying low-concentration formaldehyde waste gas |
| CN113877232A (en) * | 2020-07-02 | 2022-01-04 | 中国石油化工股份有限公司 | Method and system for treating aniline-containing gas |
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| CN113877232A (en) * | 2020-07-02 | 2022-01-04 | 中国石油化工股份有限公司 | Method and system for treating aniline-containing gas |
| CN113877232B (en) * | 2020-07-02 | 2024-01-26 | 中国石油化工股份有限公司 | Treatment method and system for aniline-containing gas |
| CN112265972A (en) * | 2020-11-13 | 2021-01-26 | 西安近代化学研究所 | Method for recycling inert carrier gas in ethylene imine production |
| CN112870922A (en) * | 2021-01-21 | 2021-06-01 | 山东宏原环保科技有限公司 | Method for purifying low-concentration formaldehyde waste gas |
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