CN203425825U - Kettle liquid circulating device for preparing glyoxylic acid through nitric acid air oxidation process - Google Patents
Kettle liquid circulating device for preparing glyoxylic acid through nitric acid air oxidation process Download PDFInfo
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- CN203425825U CN203425825U CN201320520828.0U CN201320520828U CN203425825U CN 203425825 U CN203425825 U CN 203425825U CN 201320520828 U CN201320520828 U CN 201320520828U CN 203425825 U CN203425825 U CN 203425825U
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- China
- Prior art keywords
- nitric acid
- reactor
- circulating device
- liquid circulating
- kettle liquid
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Abstract
The utility model discloses a kettle liquid circulating device for preparing glyoxylic acid through a nitric acid air oxidation process. The kettle liquid circulating device is used for solving such problems in the prior art that a large mount of NOX tail gases are generated to pollute the environment and the nitric acid consumption is large, and the like. The kettle liquid circulating device is characterized in that the kettle liquid circulating device composed of an absorption column (13), a pump (2) and a frequency converter (3) is additionally arranged above a reaction kettle (6). The original reaction kettle can be directly used without changing the original equipment configuration of a production workshop, NOX generated in an oxalaldehyde oxidation process of nitric acid is oxidized into NO2 through oxygen in the air, the NO2 enters the absorption column and returns to the reaction kettle after being absorbed by a cold kettle liquid, and the NO2 reacts with oxalaldehyde to lose oxygen to become the NOX. The nitric acid consumption and the NOX tail gas emission are reduced, and the yield of the product glyoxylic acid is increased as well.
Description
One, technical field
The utility model belongs to chemical reaction equipment, relates in particular to the still liquid circulating device that a kind of nitric acid air oxidation process is prepared glyoxalic acid.
Two, background technology
Glyoxalic acid, OHC-COOH, is important chemical intermediate, in medicine, agricultural chemicals, fine chemicals, is widely used.
Enterprise produces the common production technology adopting of glyoxalic acid: nitric acid oxidation glyoxal method.Patent CN200710054917.X, by using acidic catalyst (example hydrochloric acid), has solved the problem that glyoxal oxidizing process Raw gathers and reaction sets off an explosion suddenly.But the method is also deposited and is produced in process of production a large amount of NO
xtail gas, the problem such as contaminated environment and nitric acid consumption are large.
Three, summary of the invention
The purpose of this utility model is exactly can utilize cold still liquid to absorb NO in order to provide a kind of
x, reduce exhaust emissions, can utilize again airborne dioxygen oxidation glyoxal, the nitric acid air oxidation process that reduces nitric acid consumption is prepared the still liquid circulating device of glyoxalic acid.
The technical scheme that the utility model adopts is: it is by reactor, stirring arm, outlet valve, the parts such as heating steam valve and lower cooling water valve form, above reactor, set up a set of still liquid circulation absorption plant, this device is by absorbing column, pump and frequency converter form, absorbing column bottom is connected with reactor kettle cover with gas pipeline by return bend, bottom-up according to filler will be set in absorbing column, cooling tube and shower nozzle, blast pipe is established on top, the entrance point of pump is connected with the pipeline in inserting reactor by communicating valve, the port of export is connected with the shower nozzle in being arranged at absorbing column by conveyance conduit, by frequency converter, pump is controlled, delivery side of pump end conveyance conduit top arranges top charging aperture.The shaft top that driving stirring arm in reactor rotates arranges Gas Stirring blade, is provided with air flow rate adjustment valve and charging aperture on kettle cover.
The utility model compared with prior art, tool has the following advantages and beneficial effect: on the basis of original produces tartronic device, only need set up still liquid circulation absorption plant, do not need to change workshop existing equipment layout, just can directly utilize original reactor, by the NO producing in nitric acid oxidation glyoxal process
x, with airborne dioxygen oxidation, become NO
2, NO
2enter absorbing column, after being absorbed by cold still liquid, return to reactor, lose oxygen with glyoxal reaction and become again NO
x.Like this, both reduce the consumption of nitric acid, also reduced NO
xexhaust emissions amount, has also improved the yield of product glyoxalic acid.
Below in conjunction with accompanying drawing, the utility model is described in further detail:
Four, accompanying drawing explanation:
Fig. 1 is structural principle schematic diagram of the present utility model.
In figure: 1 is upper feeding mouth, 2 is pump, and 3 is frequency converter, and 4 is air flow rate adjustment valve, 5 is heating steam valve, and 6 is reactor, and 7 is stirring arm, 8 is outlet valve, and 9 is cooling water valve, and 10 is Gas Stirring blade, 11 is return bend, and 12 is gas pipeline, and 13 is absorbing column, 14 is cooling tube, and 15 is shower nozzle, and 16 is blast pipe, 17 is lower charging aperture, and 18 is filler, and 19 is upper cooling water valve.
Five, the specific embodiment
As shown in Figure 1, on the basis of original produces tartronic device technique equipment, set up still liquid circulation absorption plant, described this device of still liquid circulation absorption plant is by absorbing column 13, pump 2 and frequency converter 3 form, absorbing column 13 bottoms are connected with the kettle cover of reactor 6 with gas pipeline 12 by return bend 11, absorbing column 13 is interior bottom-up according to filler 18 will be set, cooling tube 14 and shower nozzle 15, blast pipe 16 is established on top, the entrance point of pump 2 is connected with the pipeline in inserting reactor by communicating valve, the port of export is connected with the shower nozzle 15 in being arranged at absorbing column 13 by conveyance conduit, by frequency converter 3, controlled, pump 2 port of export conveyance conduit tops arrange top charging aperture 1.The shaft top that driving stirring arm 7 in reactor 6 rotates arranges Gas Stirring blade 10, on kettle cover, be provided with air flow rate adjustment valve 4 and lower charging aperture 17, heating steam valve 5 joins with boiler steam pipeline, and lower cooling water valve 9 is connected with cooling water pipeline, and bottom arranges outlet valve 8.
While implementing the utility model, a certain amount of 20-40% glyoxal solution is added reactor 6 from upper feeding mouth 1, appropriate technical hydrochloric acid and water are dropped into reactor from lower charging aperture 17, under stirring, crack heating steam valve 5, while being slowly warming up to 55 ℃, then start circulating pump 2, in unlatching, cooling water valve 19, and drip rare nitric acid that appropriate water absorbs tail gas gained, reaction starts immediately, has rufous NO
xgas is emitted, drip rare nitric acid complete, drip immediately 40% nitric acid preparing in advance, when temperature rises to 60 ℃, close heating steam valve 5, open lower cooling water valve 9, reduce by 40% nitric acid dropping speed, start tail gas outlet blower fan, open air flow rate adjustment valve 4, maintain reaction temperature at 55-65 ℃, when the oxygen amount that drips nitric acid and pass into the participation chemical reaction that air brings into reaches equivalent point, stop dripping and ventilating, insulation reaction 1 hour, is cooled to 0-5 ℃, separates out white crystal, filter to obtain oxalic acid, filtrate is glyoxylic acid solution.
Claims (1)
1. a nitric acid air oxidation process is prepared the still liquid circulating device of glyoxalic acid, it comprises reactor (6), stirring arm (7), outlet valve (8), heating steam valve (5) and lower cooling water valve (9), it is characterized in that: in reactor (6) top, set up a set of still liquid circulation absorption plant, this device is by absorbing column (13), pump (2) and frequency converter (3) form, absorbing column (13) bottom is connected with the kettle cover of reactor (6) with gas pipeline (12) by return bend (11), bottom-up according to filler (18) will be set in absorbing column (13), cooling tube (14) and shower nozzle (15), blast pipe (16) is established on top, the entrance point of pump (2) is connected with the pipeline in inserting reactor by communicating valve, the port of export is connected with the shower nozzle (15) in being arranged at absorbing column (13) by conveyance conduit, by frequency converter (3), controlled, pump (2) port of export conveyance conduit top arranges top charging aperture (1), the shaft top that driving stirring arm (7) in reactor (6) rotates arranges Gas Stirring blade (10), is provided with air flow rate adjustment valve (4) and lower charging aperture (17) on kettle cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320520828.0U CN203425825U (en) | 2013-08-26 | 2013-08-26 | Kettle liquid circulating device for preparing glyoxylic acid through nitric acid air oxidation process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320520828.0U CN203425825U (en) | 2013-08-26 | 2013-08-26 | Kettle liquid circulating device for preparing glyoxylic acid through nitric acid air oxidation process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203425825U true CN203425825U (en) | 2014-02-12 |
Family
ID=50054889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320520828.0U Expired - Fee Related CN203425825U (en) | 2013-08-26 | 2013-08-26 | Kettle liquid circulating device for preparing glyoxylic acid through nitric acid air oxidation process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203425825U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108786419A (en) * | 2018-06-23 | 2018-11-13 | 台州帆环保设备科技有限公司 | A variety of exhaust gas total systems |
-
2013
- 2013-08-26 CN CN201320520828.0U patent/CN203425825U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108786419A (en) * | 2018-06-23 | 2018-11-13 | 台州帆环保设备科技有限公司 | A variety of exhaust gas total systems |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140212 Termination date: 20140826 |
|
| EXPY | Termination of patent right or utility model |