CN209596869U - A kind of processing unit of malononitrile reaction end gas - Google Patents
A kind of processing unit of malononitrile reaction end gas Download PDFInfo
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- CN209596869U CN209596869U CN201920171852.5U CN201920171852U CN209596869U CN 209596869 U CN209596869 U CN 209596869U CN 201920171852 U CN201920171852 U CN 201920171852U CN 209596869 U CN209596869 U CN 209596869U
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Abstract
The utility model discloses a kind of processing units of malononitrile reaction end gas, belong to chemical equipment technical field, processing unit includes tail gas condensing absorption plant, it further include standing rough segmentation tank, the dichloroethanes storage tank connecting with the outlet at bottom for standing rough segmentation tank and the crude salt acid holding vessel connecting with the centre exit for standing rough segmentation tank, it further include hydrochloric acid tank and the essence being connected between hydrochloric acid tank and crude salt acid holding vessel divides purifying plant, the feed inlet for standing rough segmentation tank is connect with the discharge port of tail gas condensing absorption plant.Tail gas, which is condensed, is absorbed as mixed liquor, and mixed liquor is stood rough segmentation tank and separates dichloroethanes with hydrochloric acid, and dichloroethanes is entered in dichloroethanes storage tank and recycled.Hydrochloric acid enters crude salt acid holding vessel, enters in hydrochloric acid tank and recycles after essence divides purifying plant to purify.It can solve the problems, such as that malononitrile reaction end gas, dichloroethanes and HCl recovery utilize with separating-purifying dichloroethanes and hydrochloric acid, production cost can be reduced.
Description
Technical field
The utility model belongs to chemical equipment technical field, is related to a kind of exhaust gas processing device, and especially a kind of the third two
The processing unit of nitrile reaction end gas.
Background technique
Malononitrile can be used for producing sulfonylurea herbicide such as bensulfuron-methyl, pyrazosulfuron etc., and can be used to manufacture weeding
Agent bispyribac-sodium.In medicine to manufacture diuretic, it is a series of to be also used to synthesize vitamin B1, aminopterin, triamterene etc.
Important drugs.There is important purposes in terms of dyestuff, in terms of pesticide and in terms of other.It also is used as the extractant of gold.
Malononitrile in process of production, has a large amount of dichloroethanes gases, hydrogen chloride gas evaporates, through tail gas condensing
Absorption plant, condensed absorbent are the mixed liquor of dichloroethanes and hydrochloric acid.Tail gas dichloroethanes, mixed in hydrochloric acid are produced for malononitrile
In terms of the separating-purifying of liquid, patent No. 200920271787.X provides by-product hydrogen chloride gas in a kind of malononitrile production process
Adsorbent equipment, the device are not involved with the separating-purifying of hydrochloric acid and dichloroethanes, the dichloroethanes that can not will be carried secretly in hydrochloric acid
It separates.
Summary of the invention
The utility model in order to overcome the drawbacks of the prior art, devises a kind of processing unit of malononitrile reaction end gas,
Can preferable separating-purifying dichloroethanes and hydrochloric acid, the problem of effective solution malononitrile reaction end gas, dichloroethanes and
Hydrochloric acid recycles again, can reduce production cost.
The specific technical solution that the utility model is taken is: a kind of processing unit of malononitrile reaction end gas, including tail
Be gas-cooled solidifying absorption plant, and key is: the processing unit further includes standing rough segmentation tank, the outlet at bottom with standing rough segmentation tank
The dichloroethanes storage tank of connection and the crude salt acid holding vessel connecting with the centre exit for standing rough segmentation tank further include hydrochloric acid storage
Tank and the essence being connected between hydrochloric acid tank and crude salt acid holding vessel divide purifying plant, and feed inlet and the tail gas for standing rough segmentation tank are cold
The discharge port connection of solidifying absorption plant.
Middle part visor and bottom visor is provided on the side wall for standing rough segmentation tank, stand the outlet at bottom of rough segmentation tank by
First dnockout pumps are connect with dichloroethanes storage tank, stand the centre exit of rough segmentation tank by the second dnockout pumps and crude salt acid holding vessel
Top inlet connection, the outlet at bottom of crude salt acid holding vessel divides the top inlet of purifying plant to connect by third dnockout pumps and essence
It connects.
Divide in third dnockout pumps and essence and is connected with flowmeter and pneumatic control valve between purifying plant.
Liquid level detection device is provided on standing rough segmentation tank, the measurement end of liquid level detection device, which extends to, stands rough segmentation tank
Interior bottom.
The tail gas condensing absorption plant include first order absorption flow container, stage falling-film absorber, second level absorb flow container and
Second level falling-film absorber, the air inlet of stage falling-film absorber are inlet exhaust gas, the gas outlet of stage falling-film absorber and second level
The air inlet of falling-film absorber connects, and the liquid outlet of stage falling-film absorber is connect with the inlet of first order absorption flow container, second level
The liquid outlet of falling-film absorber is connect with the inlet that second level absorbs flow container, the liquid out of first order absorption flow container and second level absorption flow container
Mouth is all connect with the feed inlet for standing rough segmentation tank, and first order absorption flow container and second level absorb and be both provided with temperature detection dress on flow container
It sets.
The tail gas condensing absorption plant further include be connected in turn first order absorption flow container and stage falling-film absorber it
Between primary cycle pump and first-stage condenser, and be connected in turn second level absorb between flow container and second level falling-film absorber two
The liquid outlet of grade circulating pump and secondary condenser, primary cycle pump is also connect with the feed inlet for standing rough segmentation tank, primary cycle pump
It is both provided with valve between first-stage condenser, between primary cycle pump and standing rough segmentation tank, the liquid outlet of secondary cycle pump is also
With stand rough segmentation tank feed inlet connect, secondary cycle pump secondary condenser between, secondary cycle pump with standing rough segmentation tank it
Between be both provided with valve.
The beneficial effects of the utility model are: the tail gas generated in malononitrile production process i.e. dichloroethanes and hydrogen chloride
Gaseous mixture is the mixed liquor of dichloroethanes and hydrochloric acid through tail gas condensing absorption plant condensed absorbent, and mixed liquor is through standing rough segmentation tank
Dichloroethanes is separated with hydrochloric acid, dichloroethanes is entered in dichloroethanes storage tank and recycled.Hydrochloric acid then enters the storage of crude salt acid
Tank is deposited, since dichloroethanes is slightly soluble in water, so leading to that a small amount of dichloroethanes can be carried in hydrochloric acid secretly, the salt in crude salt acid holding vessel
Acid divides purifying plant to purify by essence, and a small amount of dichloroethanes in hydrochloric acid is adsorbed, and the hydrochloric acid after purification then enters salt
It is recycled in acid storage tank.Can preferable separating-purifying dichloroethanes and hydrochloric acid, effective solution malononitrile reaction end gas
The problem of, dichloroethanes and hydrochloric acid recycle again, can reduce production cost.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model.
In attached drawing, 1 represents middle part visor, and 2 represent standing rough segmentation tank, and 3 represent the first dnockout pumps, and 4 represent the second dnockout pumps,
5 represent dichloroethanes storage tank, and 6 represent crude salt acid holding vessel, and 7 represent third dnockout pumps, and 8, which represent essence, divides purifying plant, and 9 represent salt
Acid storage tank, 10 represent temperature-detecting device, and 11 represent radar level gauge, and 12 represent bottom visor, and 13 represent flowmeter, and 14 represent
Pneumatic control valve, 15 represent first order absorption flow container, and 16 represent stage falling-film absorber, and 17, which represent second level, absorbs flow container, and 18 represent
Second level falling-film absorber, 19 represent primary cycle pump, and 20 represent first-stage condenser, and 21 represent secondary cycle pump, and 22 represent second level
Condenser.
Specific embodiment
It elaborates in the following with reference to the drawings and specific embodiments to the utility model:
Specific embodiment, as shown in Figure 1, a kind of processing unit of malononitrile reaction end gas, including tail gas condensing absorb dress
It sets, the processing unit further includes the dichloroethanes storage tank for standing rough segmentation tank 2, connecting with the outlet at bottom for standing rough segmentation tank 2
5 and with the crude salt acid holding vessel 6 that connect of centre exit that stands rough segmentation tank 2, further include hydrochloric acid tank 9 and be connected to hydrochloric acid
Essence between storage tank 9 and crude salt acid holding vessel 6 divides purifying plant 8, stands the feed inlet and tail gas condensing absorption plant of rough segmentation tank 2
Discharge port connection.
As to further improvement of the utility model, middle part visor 1 and bottom are provided on the side wall for standing rough segmentation tank 2
Portion's visor 12, the outlet at bottom for standing rough segmentation tank 2 are connect by the first dnockout pumps 3 with dichloroethanes storage tank 5, stand rough segmentation tank 2
Centre exit connect by the second dnockout pumps 4 with the top inlet of crude salt acid holding vessel 6, the bottom of crude salt acid holding vessel 6 goes out
Mouth divides the top inlet of purifying plant 8 to connect by third dnockout pumps 7 with essence.It can be with by middle part visor 1 and bottom visor 12
The position of oil, water stratified liquid in real time inspection standing rough segmentation tank 2, the first dnockout pumps 3 of timely control and the second dnockout pumps 4 are opened
Off status, in order to avoid dichloroethanes is squeezed into crude salt acid holding vessel 6, squeezes into water phase in dichloroethanes storage tank 5, refining effect is more
It is good.
As to further improvement of the utility model, divides between purifying plant 8 in third dnockout pumps 7 and essence and be connected with stream
Scale 13 and pneumatic control valve 14.Using pneumatic control valve 14 is adjustable essence is sent to by third dnockout pumps 7 divides purifying plant 8
Interior flow rate of liquid can more intuitively check the specific value of flow velocity by flowmeter 13, adjust more accurate, Ke Yigeng
It satisfies the use demand well.
As to further improvement of the utility model, liquid level detection device 11, liquid level are provided on standing rough segmentation tank 2
The measurement end of detection device 11 extends to the bottom stood in rough segmentation tank 2.It can be quiet with real time inspection using liquid level detection device 11
The liquid level in rough segmentation tank 2 is set, convenient for stopping charging when liquid level reaches stand 2 reserves of rough segmentation tank 80%.Liquid level detection device
11 be preferably radar level gauge, is not influenced by noise, steam, dust, resolution ratio is up to 1mm.
As to further improvement of the utility model, tail gas condensing absorption plant includes first order absorption flow container 15, level-one
Falling-film absorber 16, second level absorb flow container 17 and second level falling-film absorber 18, and the air inlet of stage falling-film absorber 16 is tail gas
The gas outlet of import, stage falling-film absorber 16 is connect with the air inlet of second level falling-film absorber 18, stage falling-film absorber 16
Liquid outlet connect with the inlet of first order absorption flow container 15, the liquid outlet of second level falling-film absorber 18 and second level absorb flow container 17
Inlet connection, the liquid outlet that first order absorption flow container 15 and second level absorb flow container 17 all connects with the feed inlet for standing rough segmentation tank 2
It connects, first order absorption flow container 15 and second level absorb and be both provided with temperature-detecting device 10 on flow container 17, and temperature-detecting device 10 is preferred
For thermometer, first order absorption flow container 15 and second level absorption flow container 17 are all sleeping tanks.Condensed in two stages absorbs, and assimilation effect is more preferable, benefit
The temperature that mixed liquor in flow container 17 can be absorbed with real time inspection first order absorption flow container 15 and second level with temperature-detecting device 10, is convenient for
The temperature of mixed liquor is controlled within the scope of required temperature.
As to further improvement of the utility model, tail gas condensing absorption plant further includes being connected to first order absorption in turn
Primary cycle pump 19 and first-stage condenser 20 between flow container 15 and stage falling-film absorber 16, and it is connected to second level suction in turn
Secondary cycle pump 21 and the secondary condenser 22 between flow container 17 and second level falling-film absorber 18 are received, primary cycle pump 19 goes out liquid
Mouth also with stand rough segmentation tank 2 feed inlet connect, primary cycle pump 19 and first-stage condenser 20 between, primary cycle pump 19 with it is quiet
It sets and is both provided with valve between rough segmentation tank 2, the liquid outlet of secondary cycle pump 21 is also connect with the feed inlet for standing rough segmentation tank 2, and two
Valve is both provided between grade circulating pump 21 and secondary condenser 22, between secondary cycle pump 21 and standing rough segmentation tank 2.Level-one is cold
The setting of condenser 20 and secondary condenser 22, so that two stage cycle formula condensed absorbent may be implemented in tail gas condensing absorption plant, just
The temperature of mixed liquor in flow container 17 is absorbed in control first order absorption flow container 15 and second level.
The utility model is when specifically used, as shown in Figure 1, by stage falling-film absorber 16, first-stage condenser 20, second level
It is both provided with cold water jacket on falling-film absorber 18 and secondary condenser 22, cold water inlet valve and hot water are both provided on cold water jacket
Flowing water Valve opens inlet valve, is passed through 7 DEG C of cold water, opens primary cycle pump 19 and secondary cycle pump 21, from production dress
The mixed tail gas of the dichloroethanes and hydrogen chloride set, by stage falling-film absorber 16, the liquid being condensed into enters level-one suction
It receives in flow container 15, remaining mixed tail gas enters after second level falling-film absorber 18 is condensed into liquid and enters second level absorbing liquid
In tank 17, circulating condensing is may be implemented in the setting of first-stage condenser 20 and secondary condenser 22, and condensation effect is more preferable.Level-one is inhaled
The mixeding liquid temperature control content of hydrochloric acid in 5-10 DEG C, mixed liquor received in flow container 15 and second level absorption flow container 17 reaches 28-
Extraction, which is arrived, when 30% stands rough segmentation tank 2.
When the liquid level for standing rough segmentation tank 2 reaches the 80% of reserves, stop charging, sufficient standing makes dichloroethanes and hydrochloric acid
Preliminary layering；The second dnockout pumps 4 are then turned on, the hydrochloric acid on upper layer is squeezed into crude salt acid holding vessel 6, opens third dnockout pumps 7, is adjusted
Whole pneumatic control valve 14 makes flowmeter 13 be shown as 1.5-2t/h, i.e. essence divides the feed rate of purifying plant 8 to be 1.5-2t/h,
Hydrochloric acid in crude salt acid holding vessel 6 enters hydrochloric acid tank 9 after essence divides purifying plant 8 to purify, and HCl recovery utilizes；Work as standing
When oil, water stratified liquid occurs in the middle part visor 1 of 2 side wall of rough segmentation tank, the second dnockout pumps 4 are closed, open the first dnockout pumps 3, it will
Bottom oil phase material squeezes into dichloroethanes storage tank 5, and dichloroethanes recycles；When the bottom visor 12 for standing rough segmentation tank 2 occurs
When oil, water stratified liquid, the first dnockout pumps 3 are closed, in order to avoid water phase is squeezed into dichloroethanes storage tank 5.
The gaseous mixture of dichloroethanes and hydrogen chloride is dichloro through tail gas condensing absorption plant condensed absorbent by the utility model
The mixed liquor of ethane and hydrochloric acid, mixed liquor are stood rough segmentation tank 2 and are separated dichloroethanes with hydrochloric acid, and dichloroethanes enters dichloro
It is recycled in ethane storage tank 5.Hydrochloric acid then enters crude salt acid holding vessel 6, since dichloroethanes is slightly soluble in water, so leading to hydrochloric acid
In can carry a small amount of dichloroethanes secretly, the hydrochloric acid in crude salt acid holding vessel 6 divides purifying plant 8 to purify by essence, a small amount of in hydrochloric acid
Dichloroethanes is adsorbed, and the hydrochloric acid after purification is then entered in hydrochloric acid tank 9 and recycled.It can preferable separating-purifying
The problem of dichloroethanes and hydrochloric acid, effective solution malononitrile reaction end gas, dichloroethanes and hydrochloric acid recycle again, can
To reduce production cost.
Claims (6)
1. a kind of processing unit of malononitrile reaction end gas, including tail gas condensing absorption plant, it is characterised in that: the processing
Device further includes dichloroethanes storage tank (5), the Yi Jiyu for standing rough segmentation tank (2), connecting with the outlet at bottom for standing rough segmentation tank (2)
Stand rough segmentation tank (2) centre exit connection crude salt acid holding vessel (6), further include hydrochloric acid tank (9) and be connected to hydrochloric acid storage
Essence between tank (9) and crude salt acid holding vessel (6) is divided purifying plant (8), and the feed inlet and tail gas condensing for standing rough segmentation tank (2) are inhaled
The discharge port of receiving apparatus connects.
2. a kind of processing unit of malononitrile reaction end gas according to claim 1, it is characterised in that: standing rough segmentation tank
(2) it is provided with middle part visor (1) and bottom visor (12) on side wall, stands the outlet at bottom of rough segmentation tank (2) by first dozen
Material pump (3) is connect with dichloroethanes storage tank (5), stands the centre exit of rough segmentation tank (2) by the second dnockout pumps (4) and crude salt acid
The top inlet of holding vessel (6) connects, and the outlet at bottom of crude salt acid holding vessel (6) is by third dnockout pumps (7) and essence point purification
The top inlet of device (8) connects.
3. a kind of processing unit of malononitrile reaction end gas according to claim 2, it is characterised in that: in third dnockout pumps
(7) divide between purifying plant (8) with essence and be connected with flowmeter (13) and pneumatic control valve (14).
4. a kind of processing unit of malononitrile reaction end gas according to claim 1, it is characterised in that: standing rough segmentation tank
(2) it is provided on liquid level detection device (11), the measurement end of liquid level detection device (11) extends to the bottom stood in rough segmentation tank (2)
Portion.
5. a kind of processing unit of malononitrile reaction end gas according to claim 1, it is characterised in that: the tail gas is cold
Solidifying absorption plant includes first order absorption flow container (15), stage falling-film absorber (16), second level absorption flow container (17) and second level falling liquid film
Absorber (18), the air inlet of stage falling-film absorber (16) are inlet exhaust gas, the gas outlet of stage falling-film absorber (16) with
The air inlet of second level falling-film absorber (18) connects, liquid outlet and first order absorption flow container (15) of stage falling-film absorber (16)
The liquid outlet of inlet connection, second level falling-film absorber (18) is connect with the inlet that second level absorbs flow container (17), first order absorption
The liquid outlet that flow container (15) and second level absorb flow container (17) is all connect with the feed inlet for standing rough segmentation tank (2), first order absorption flow container
(15) it absorbs with second level and is both provided with temperature-detecting device (10) on flow container (17).
6. a kind of processing unit of malononitrile reaction end gas according to claim 5, it is characterised in that: the tail gas is cold
Solidifying absorption plant further includes the primary cycle being connected in turn between first order absorption flow container (15) and stage falling-film absorber (16)
(19) and first-stage condenser (20) are pumped, and is connected to second level in turn and absorbs between flow container (17) and second level falling-film absorber (18)
Secondary cycle pump (21) and secondary condenser (22), primary cycle pump the liquid outlet of (19) also with standing rough segmentation tank (2) into
Material mouth connection, primary cycle pump between (19) and first-stage condenser (20), between primary cycle pump (19) and standing rough segmentation tank (2)
It is both provided with valve, the liquid outlet of secondary cycle pump (21) is also connect with the feed inlet for standing rough segmentation tank (2), secondary cycle pump
(21) valve is both provided between secondary condenser (22), between secondary cycle pump (21) and standing rough segmentation tank (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920171852.5U CN209596869U (en) | 2019-01-31 | 2019-01-31 | A kind of processing unit of malononitrile reaction end gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920171852.5U CN209596869U (en) | 2019-01-31 | 2019-01-31 | A kind of processing unit of malononitrile reaction end gas |
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| Publication Number | Publication Date |
|---|---|
| CN209596869U true CN209596869U (en) | 2019-11-08 |
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|---|---|---|---|
| CN201920171852.5U Active CN209596869U (en) | 2019-01-31 | 2019-01-31 | A kind of processing unit of malononitrile reaction end gas |
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| Country | Link |
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| CN (1) | CN209596869U (en) |
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Effective date of registration: 20210625 Address after: 050000 South Industrial Zone, Yuanshi County, Shijiazhuang City, Hebei Province Patentee after: HEBEI CHENGXIN JIUTIAN PHARMACEUTICAL CHEMICAL Co.,Ltd. Address before: 051130 Dongyuan Zhaolu south, Yuanshi railway station, Shijiazhuang City, Hebei Province Patentee before: HEBEI CHENGXIN Co.,Ltd. |