CN109232228A - A kind of system and method handling acetic acid plant propionic acid process tail gas - Google Patents
A kind of system and method handling acetic acid plant propionic acid process tail gas Download PDFInfo
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- CN109232228A CN109232228A CN201811222610.0A CN201811222610A CN109232228A CN 109232228 A CN109232228 A CN 109232228A CN 201811222610 A CN201811222610 A CN 201811222610A CN 109232228 A CN109232228 A CN 109232228A
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- washing water
- tail gas
- circulating tank
- propionic acid
- water circulating
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
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- Oil, Petroleum & Natural Gas (AREA)
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Abstract
The invention discloses a kind of system and methods for handling acetic acid plant propionic acid process tail gas: water is added washing water circulating tank, when certain liquid level, stops plus water；Water boosting enters in exhaust scrubber；Certain liquid level is formed in exhaust scrubber bottom, is discharged into washing water circulating tank from liquid outlet, establishes washing water circulation；The tail gas that propionic acid process generates enters exhaust scrubber lower part, first time contact, dissolution are carried out with the water of exhaust scrubber bottom one time, undissolved inert gas and partial organic substances, which are moved up, contact for the second time with the water that top enters, dissolve, the organic solution washed is back in washing water circulating tank from exhaust scrubber bottom, it is recycled, undissolved inert gas is discharged into atmosphere from exhaust scrubber top vent.The tail gas that the present invention avoids propionic acid process from generating is discharged into atmosphere, is generated peculiar smell, is polluted the environment.
Description
Technical field
The present invention relates to a kind of system and methods for handling propionic acid tail gas, and more specifically, it relates to a kind of processing acetic acid
The system and method for device propionic acid process tail gas.
Background technique
Low-pressure methanol liquid phase carbonyl synthesizes in the technique of acetic acid, while synthesizing acetic acid, generates a small amount of propionic acid by-product
Object, by a series of distillation processes of the rectification working process in synthesis acetic acid technique, will contain third to obtain qualified acetate products
Acid by-product separate, according to synthesis acetic acid operational characteristic, the material that rectifying is isolated mainly contain propionic acid, acetic acid,
High boiling point organic compound and organic salt, this material have strong pungent smell.There is 201420818264.3 He of patent
201420674560.0 describe the method recycled to the propionic acid in this material, include head tank, scraper plate film in patent
Evaporator takes off the capital equipments such as acetic acid tower, propionic acid tower, propionic acid tank, and the material containing propionic acid in head tank enters scraper plate thin film evaporation
Organic salt and high boiling point organic compound are removed in device, removed acetic acid by de- acetic acid tower, the spirit of vinegar of removing
It returns in acetic acid master device and carries out the recycling of Dichlorodiphenyl Acetate, propionic acid is removed again by propionic acid tower, obtains finished product propionic acid.Above-mentioned patent
Involved in tower and the tail gas of the equipment such as storage tank be discharged into flare system or be directly discharged into atmosphere, when encountering fluctuation, discharge
Tolerance will be more than normal discharge amount, the equipment for being especially directly discharged into atmosphere generates larger peculiar smell on device periphery, influence ring
Environmental issue is brought in border, and device can only stop when peculiar smell is excessive.
Summary of the invention
Purpose of the invention is to overcome the shortcomings in the prior art, provides a kind of processing acetic acid plant propionic acid process tail
The system and method for gas overcomes the problems, such as that propionic acid process tail gas generates peculiar smell in the prior art, the tail for avoiding propionic acid process from generating
Gas is discharged into atmosphere, is generated peculiar smell, is polluted the environment, and water circulation use is washed, and is saved water resource, is avoided wasting.
The purpose of the present invention can be achieved through the following technical solutions.
The system of processing acetic acid plant propionic acid process tail gas of the invention, including washing water circulating tank, the washing water follow
Once water feed liquor pipeline, the washing water circulating tank top vent are connected with high point exhaust line to the connection of ring tank inlet,
Liquid circulation pipeline, the washing water circulation are connected between the washing water circulating tank circulation port and exhaust scrubber liquid outlet
Washing water pump is connected with by pipeline between tank liquid outlet and exhaust scrubber upper feed inlet, the washing water pump and tail gas are washed
It washs the pipeline connected between device and is provided with regulating valve；Exhaust outlet, the exhaust scrubber are provided at the top of the exhaust scrubber
It is connected with propionic acid process tail gas admission line.
The pipeline connected between the washing water pump and washing water circulating tank is provided with filter.
The washing water circulating tank is atmospheric storage tank, and the washing water circulating tank bottom and side wall is respectively arranged with discharge outlet
And overflow port, the discharge outlet and overflow port pass through pipeline and are connected to gutter.
The exhaust scrubber is atmospheric pressure device, and upper feed inlet uses form of nozzle.
The propionic acid process tail gas admission line outlet setting height is lower than exhaust scrubber liquid outlet height 50-
150mm。
The purpose of the present invention can be achieved through the following technical solutions.
The method of processing acetic acid plant propionic acid process tail gas of the invention, comprising the following steps:
Step 1: the water that pressure is 0.3~0.4MpaG is added in washing water circulating tank, reach certain liquid level
When, a water is added in stopping；
Enter tail gas step 2: a water in washing water circulating tank by washing water pump boosts to 0.4-0.6MpaG and wash
It washs in device, is 1.5-6m by the water flow that regulating valve control enters exhaust scrubber3/h；
Step 3: the liquid level of certain altitude is formed in exhaust scrubber bottom, from out after a water enters exhaust scrubber
Liquid mouth is discharged into washing water circulating tank, repeats the first step to third step and establishes washing water circulation；
Step 4: the tail gas that propionic acid process generates enters exhaust scrubber lower part, one had with exhaust scrubber bottom
Secondary water carries out first time contact, dissolution, and partial organic substances are dissolved in a water, undissolved inert gas and partial organic substances
Move up and second contact with the water that exhaust scrubber top enters, dissolve, wash the organic solution got off from
Exhaust scrubber liquid outlet is back in washing water circulating tank, is recycled, and undissolved inert gas is from exhaust scrubber top
Portion's exhaust outlet is discharged into atmosphere.
Washing water circulating tank liquid level is no more than 80% in the first step.
Washing water pump entrance is equipped with filter in second step, after washing water pump is run three months or discovery washing water pump outlet
Pressure decline, then stop washing water pump, clears up filter and checks washing water pump.
4th step operating a period of time, the solution in washing water circulating tank is analyzed, after reaching certain condition, to washing
The solution washed in water circulating tank is replaced, specifically:
(1) analysis is sampled once to the solution in washing water circulating tank daily, surveys pH value, it is right when pH value is less than 3
The solution of washing water circulating tank is replaced, until solution pH value is 7, stops displacement；
(2) solution temperature paid close attention in washing process in washing water circulating tank follows washing water when temperature reaches 40 DEG C
The solution of ring tank is replaced, until solution temperature is lower than 40 DEG C, stops displacement.
Compared with prior art, the beneficial effects brought by the technical solution of the present invention are as follows:
The present invention has the characteristics that the tail gas of intense irritation smell is soluble easily in water using the generation of propionic acid process, by propionic acid work
The exhaust line of each equipment for the tail gas that sequence generates, which summarizes to a supervisor, to be incorporated in exhaust scrubber, by using a water
Volatile organic compounds in propionic acid process tail gas are washed, avoid being discharged into atmosphere, peculiar smell is generated, pollutes the environment,
The washing water of exhaust scrubber is flow back into washing water circulating tank using potential difference by gravity, and the mesh of washing water circulation use is reached
, water resource is saved, avoids wasting.
After the present invention comes into operation, the washing water flow of exhaust scrubber is controlled by regulating valve, flow is excessive to easily cause third
The line pressure that sour process comes increases, and has an impact to the operation of propionic acid process, flow is too small not to have washing effect, still has
Peculiar smell generates, and is operated by reinforcing, optimizes and revises, constantly grope feasible operation mode, according to actual operating condition, protecting
Propionic acid maximum production under the premise of card system stable operation.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the system of present invention processing acetic acid plant propionic acid process tail gas.
Appended drawing reference: 1 water feed liquor pipelines, 2 washing water circulating tanks, 3 gutters, 4 washing water pumps, 5 regulating valves, 6 tails
Gas washing device, 7 propionic acid process tail gas admission lines, 8 high point exhaust lines, 9 discharge outlets, 10 overflow ports, 11 filters, 12 liquid
Pipeloop
Specific embodiment
The invention will be further described with reference to the accompanying drawing.
As shown in Figure 1, the system of processing acetic acid plant propionic acid process tail gas of the invention, including 2 He of washing water circulating tank
Exhaust scrubber 6.Once water feed liquor pipeline 1, the washing water circulating tank 2 push up for 2 inlet of the washing water circulating tank connection
Portion's exhaust outlet is connected with high point exhaust line 8, is communicated with the atmosphere, and prevents plus dilutional hyponatremia causes 2 pressure rise of washing water circulating tank.
The washing water circulating tank 2 is atmospheric storage tank, and 2 bottom and side wall of washing water circulating tank is respectively arranged with discharge outlet 9 and overflows
Head piece 10, the discharge outlet 9 and overflow port 10 are connected to gutter 3 by pipeline, and when adding dilutional hyponatremia, superfluous water passes through overflow
Mouth 10 drains into gutter 3.
Liquid circulation pipeline 12, institute are connected between 2 circulation port of washing water circulating tank and 6 liquid outlet of exhaust scrubber
It states and washing water pump 4 is connected with by pipeline between 6 upper feed inlet of 2 liquid outlet of washing water circulating tank and exhaust scrubber, it is described
The pipeline connected between washing water pump 4 and washing water circulating tank 2 is provided with filter 11, the washing water pump 4 and washing tail gas
The pipeline connected between device 6 is provided with regulating valve 5.The washing water pump 4 is common centrifugal pump, is needed before starting washing water pump 4
Tank liquid, exhaust are carried out, guarantees 4 normal operation of washing water pump.
Exhaust outlet is provided at the top of the exhaust scrubber 6, the exhaust scrubber 6 is connected with propionic acid process tail gas air inlet
Pipeline 7, the propionic acid process tail gas admission line 7 are inserted into exhaust scrubber 6 liquid level hereinafter, the propionic acid process tail gas air inlet
7 outlet of pipeline setting height is lower than 6 liquid outlet height 50-150mm of exhaust scrubber.The exhaust scrubber 6 sets for normal pressure
Standby, upper feed inlet uses form of nozzle, by drench with rain or water mist in the form of spray and increase and the contact area of tail gas.
The method of processing acetic acid plant propionic acid process tail gas of the invention, propionic acid process comes into operation before driving, and this handles acetic acid dress
The system for setting propionic acid process tail gas washs the tail gas generated during driving.Specific step is as follows:
Step 1: the water that pressure is 0.3~0.4MpaG is added in washing water circulating tank 2, reach certain liquid level
When, a water is added in stopping.Wherein, 2 liquid level of washing water circulating tank is usually no more than 80%.
Step 2: a water in washing water circulating tank 2 boosts to 0.4-0.6MpaG by washing water pump 4 and washes from tail gas
It washs 6 upper feed inlet of device to enter in exhaust scrubber 6, is by the water flow that the control of regulating valve 5 enters exhaust scrubber 6
1.5-6m3/h.Wherein, into a water flow of exhaust scrubber 6 depending on 6 operation conditions of exhaust scrubber, flow mistake
Small not have washing effect, propionic acid operation is made in the excessive propionic acid process tail gas pressure rise caused into exhaust scrubber 6 of flow
At influence.
Step 3: forming the liquid level of certain altitude after a water enters exhaust scrubber 6 in 6 bottom of exhaust scrubber, protecting
Card tail gas is sufficiently dissolved, and is discharged into washing water circulating tank 2 from liquid outlet, repeats the first step to third step and set up washing water to follow
Washing water circulation of the ring tank 2 to washing water pump 4 to exhaust scrubber 6 to washing water circulating tank 2.
Step 4: propionic acid process can drive, the tail gas that propionic acid process generates enters 6 lower part of exhaust scrubber, with tail gas
The water that 6 bottom of washer has carries out first time contact, dissolution, and most of organic matter is dissolved in a water, undissolved
Inert gas and small part organic matter is moved up carries out second with the water that top enters and contact, dissolve, will be organic
Object is washed, and is washed the organic solution got off and is back in washing water circulating tank 2 from 6 liquid outlet of exhaust scrubber, circulation makes
With undissolved inert gas is discharged into atmosphere from 6 top vent of exhaust scrubber.
Wherein, during propionic acid process is driven, when operating normally and fluctuating, each exhaust equipment of propionic acid process is paid close attention to
Pressure, regulating valve 5 is adjusted according to pressure condition and live actual state in time, guarantees 6 normal operation of exhaust scrubber, sufficiently
Wash tail gas.
4 entrance of washing water pump is equipped with filter 11, after washing water pump 4 is run three months or discovery washing water pump 4 outlet pressure
Power decline, then stop washing water pump 4, clears up filter 11 and checks washing water pump 4, guarantees that washing water pump 4 is stable.
In addition, the system that the present invention handles acetic acid plant propionic acid process tail gas operates a period of time, to washing water circulating tank 2
In solution analyzed, after reaching certain condition, need to replace the solution in washing water circulating tank 2, specifically:
(a) analysis is sampled once to the solution in washing water circulating tank 2 daily, surveys pH value, when pH value is less than 3,
The solution of washing water circulating tank 2 is replaced, until solution pH value is 7, stops displacement.
(b) solution temperature in washing water circulating tank 2 is paid close attention in washing process, to avoid the material washed from waving again
It is sent in atmosphere, when temperature reaches 40 DEG C, the solution of washing water circulating tank 2 is replaced, until solution temperature is lower than 40
DEG C, stop displacement.
Embodiment 1
(1) water that pressure is 0.3MpaG is added in washing water circulating tank, washing water circulating tank liquid level to 70%
When stop be added a water.
(2) start washing water pump, control pump discharge pressure is 0.4MpaG, and a water, flow control is added to exhaust scrubber
System is in 1.5m3/ h, one time water enters in exhaust scrubber, is formed in exhaust scrubber bottom and is higher than tail gas admission line outlet
Liquid level, and from exhaust scrubber liquid outlet using gravity return washing water circulating tank in.
To propionic acid process drive and normal operation after enter the propionic acid tail gas of exhaust scrubber and after exhaust scrubber washs
Emission be sampled detection, acid content 10% in propionic acid tail gas, is discharged after exhaust scrubber washs when propionic acid is driven
Tail gas in acid be not detected, acid content 60% in propionic acid tail gas, the tail gas discharged after exhaust scrubber washs after normal operation
Middle acid content is 7%, and absorptivity reaches 95%.
Embodiment 2
(1) water that pressure is 0.35MpaG is added in washing water circulating tank, washing water circulating tank liquid level arrives
Stop that a water is added when 60%.
(2) start washing water pump, control pump discharge pressure is 0.5MpaG, and a water, flow control is added to exhaust scrubber
System is in 4m3/ h, one time water enters in exhaust scrubber, is formed in exhaust scrubber bottom and is higher than tail gas admission line outlet
Liquid level, and returned in washing water circulating tank from exhaust scrubber liquid outlet using gravity.
To propionic acid process drive and normal operation after enter the propionic acid tail gas of exhaust scrubber and after exhaust scrubber washs
Emission be sampled detection, acid content 10% in propionic acid tail gas, is discharged after exhaust scrubber washs when propionic acid is driven
Tail gas in acid be not detected, acid content 60% in propionic acid tail gas, the tail gas discharged after exhaust scrubber washs after normal operation
Middle acid content is 5.7%, and absorptivity reaches 96%.
Embodiment 3
(1) water that pressure is 0.4MpaG is added in washing water circulating tank, washing water circulating tank liquid level to 80%
When stop be added a water.
(2) start washing water pump, control pump discharge pressure is 0.6MpaG, and a water, flow control is added to exhaust scrubber
System is in 6m3/ h, one time water enters in exhaust scrubber, is formed in exhaust scrubber bottom and is higher than tail gas admission line outlet
Liquid level, and returned in washing water circulating tank from exhaust scrubber liquid outlet using gravity.
To propionic acid process drive and normal operation after enter the propionic acid tail gas of exhaust scrubber and after exhaust scrubber washs
Emission be sampled detection, acid content 10% in propionic acid tail gas, is discharged after exhaust scrubber washs when propionic acid is driven
Tail gas in acid be not detected, acid content 60% in propionic acid tail gas, the tail gas discharged after exhaust scrubber washs after normal operation
Middle acid content is 4.3%, and absorptivity reaches 97%.
Although function and the course of work of the invention are described above in conjunction with attached drawing, the invention is not limited to
Above-mentioned concrete function and the course of work, the above mentioned embodiment is only schematical, rather than restrictive, ability
The those of ordinary skill in domain under the inspiration of the present invention, is not departing from present inventive concept and scope of the claimed protection situation
Under, many forms can also be made, all of these belong to the protection of the present invention.
Claims (9)
1. a kind of system for handling acetic acid plant propionic acid process tail gas, including washing water circulating tank (2), which is characterized in that described
Once water feed liquor pipeline (1), washing water circulating tank (2) top vent connect the connection of washing water circulating tank (2) inlet
It is connected to high point exhaust line (8), is connected between washing water circulating tank (2) circulation port and exhaust scrubber (6) liquid outlet
Liquid circulation pipeline (12) passes through pipe between washing water circulating tank (2) liquid outlet and exhaust scrubber (6) upper feed inlet
Line is connected with washing water pump (4), and the pipeline connected between the washing water pump (4) and exhaust scrubber (6) is provided with regulating valve
(5)；It is provided with exhaust outlet at the top of the exhaust scrubber (6), the exhaust scrubber (6) is connected with propionic acid process tail gas air inlet
Pipeline (7).
2. the system of processing acetic acid plant propionic acid process tail gas according to claim 1, which is characterized in that the washing water
The pipeline connected between pump (4) and washing water circulating tank (2) is provided with filter (11).
3. the system of processing acetic acid plant propionic acid process tail gas according to claim 1, which is characterized in that the washing water
Circulating tank (2) is atmospheric storage tank, and washing water circulating tank (2) bottom and side wall is respectively arranged with discharge outlet (9) and overflow port
(10), the discharge outlet (9) and overflow port (10) are connected to gutter (3) by pipeline.
4. the system of processing acetic acid plant propionic acid process tail gas according to claim 1, which is characterized in that the tail gas is washed
Washing device (6) is atmospheric pressure device, and upper feed inlet uses form of nozzle.
5. the system of processing acetic acid plant propionic acid process tail gas according to claim 1, which is characterized in that the propionic acid work
Sequence tail gas admission line (7) outlet setting height is lower than exhaust scrubber (6) liquid outlet height 50-150mm.
6. a kind of method for handling acetic acid plant propionic acid process tail gas, which comprises the following steps:
Step 1: the water that pressure is 0.3~0.4MpaG is added in washing water circulating tank (2), reach certain liquid level
When, a water is added in stopping；
Step 2: a water in washing water circulating tank (2) boosts to 0.4-0.6MpaG by washing water pump (4) and enters tail gas
It is 1.5-6m by the water flow that regulating valve (5) control enters exhaust scrubber (6) in washer (6)3/h；
Step 3: the liquid level of certain altitude is formed in exhaust scrubber (6) bottom after a water enters exhaust scrubber (6), from
Liquid outlet flows into washing water circulating tank (2), repeats the first step to third step and establishes washing water circulation；
Step 4: the tail gas that propionic acid process generates enters exhaust scrubber (6) lower part, have with exhaust scrubber (6) bottom
Water carries out first time contact, dissolution, and partial organic substances are dissolved in a water, and undissolved inert gas and part are organic
Object, which is moved up, to carry out second with the water that top enters and contacts, dissolves, and washs the organic solution got off from washing tail gas
Device (6) liquid outlet is back in washing water circulating tank (2), is recycled, and undissolved inert gas is pushed up from exhaust scrubber (6)
Portion's exhaust outlet is discharged into atmosphere.
7. the method for processing acetic acid plant propionic acid process tail gas according to claim 6, which is characterized in that washed in the first step
Water circulating tank (2) liquid level is washed no more than 80%.
8. the method for processing acetic acid plant propionic acid process tail gas according to claim 6, which is characterized in that washed in second step
Water pump (4) entrance is washed equipped with filter (11), after washing water pump (4) is run three months or discovery washing water pump (4) outlet pressure
Decline, then stop washing water pump (4), clears up filter (11) and checks washing water pump (4).
9. the method for processing acetic acid plant propionic acid process tail gas according to claim 6, which is characterized in that the operating of the 4th step
For a period of time, the solution in washing water circulating tank (2) is analyzed, after reaching certain condition, is needed to washing water circulating tank
(2) solution in is replaced, specifically:
(a) analysis is sampled once to the solution in washing water circulating tank (2) daily, surveys pH value, it is right when pH value is less than 3
The solution of washing water circulating tank (2) is replaced, until solution pH value is 7, stops displacement；
(b) solution temperature paid close attention in washing process in washing water circulating tank (2) follows washing water when temperature reaches 40 DEG C
The solution of ring tank (2) is replaced, until solution temperature is lower than 40 DEG C, stops displacement.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811222610.0A CN109232228A (en) | 2018-10-19 | 2018-10-19 | A kind of system and method handling acetic acid plant propionic acid process tail gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811222610.0A CN109232228A (en) | 2018-10-19 | 2018-10-19 | A kind of system and method handling acetic acid plant propionic acid process tail gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110404379A (en) * | 2019-06-17 | 2019-11-05 | 江苏索普（集团）有限公司 | A kind of VOC governing system and method in synthesizing acetic acid by methanol low-pressure carbonylation |
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