CN201990617U - Oxidation equipment used in production of trimellitic anhydride - Google Patents
Oxidation equipment used in production of trimellitic anhydride Download PDFInfo
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- CN201990617U CN201990617U CN2011201344925U CN201120134492U CN201990617U CN 201990617 U CN201990617 U CN 201990617U CN 2011201344925 U CN2011201344925 U CN 2011201344925U CN 201120134492 U CN201120134492 U CN 201120134492U CN 201990617 U CN201990617 U CN 201990617U
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Abstract
The utility model relates to chemical production equipment, in particular to oxidation equipment used in the production of trimellitic anhydride. The oxidation equipment comprises an oxidation column and a gas conveying pipeline; a port of the pipeline is positioned at the lower part of an inner cavity of the oxidation column; a guide cylinder is arranged above the port of the pipeline, and a cylinder opening thereof is upward and is lower than a liquid level of liquid materials inside the oxidation column. The gas exhausted through the pipeline naturally and upwardly flows into the guide cylinder; as the gas accelerates to flow upwards under the acceleration of buoyancy force, a negative pressure area is formed in the guide cylinder; the negative pressure sucks the liquid below the guide cylinder into the guide cylinder and leads the liquid to flow upwards and be in mixed contact with the gas to flow out of the upper end of the guide cylinder, then the gas overflows out of the liquid level, and the liquid flows to the bottom of the column downwards along the outer wall of the guide cylinder. The liquid materials in the oxidation equipment flow back and forth and are in contact with the gas in the guide cylinder to react; and the probabilities of the liquid materials at all positions in the column in contact with the gas are nearly equal. The oxidation equipment has more uniform and complete reaction and higher reaction efficiency.
Description
Technical field
The utility model relates to chemical production equipment, is specifically related to produce the employed oxidation furnaces of trimellitic acid 1,2-anhydride.
Background technology
Trimellitic acid 1,2-anhydride is the intermediate that is used to make products such as vibrin and polyimide resin, has purposes widely.Its production technique is normally: in oxidizing tower, be solvent under certain condition with acetic acid, the dissolved unsym-trimethyl benzene contacts with the pressurized air that continues to feed, oxygen in the air just generates trimellitic acid with unsym-trimethyl benzene generation oxidizing reaction, then reaction mass dehydration slough water and acetic acid in the still and deviate from a part water both thick product, the rectifying in rectifying tower of thick product is collected and is obtained highly purified trimellitic acid 1,2-anhydride, and the high-purity trimellitic acid acid anhydride with liquid state can be packaged as product with slicing machine cooling section then.
In the prior art as shown in Figure 1, pressurized air by pipe-line transportation to oxidizing tower bottom, then be dissolved in acetic acid in unsym-trimethyl benzene contact, react.Because the density of air is little, so gas phase is always overflowed liquid level with the fastest speed, the shortest path, so just has only liquid-to-air full contact directly over the mouth of pipe of air delivery pipe, react completely, the liquid at reactor edge is difficult to then react insufficient because lack with contacting of oxygen, the liquid of mouth of pipe below part then is the anoxybiotic dead angle, can't touch air all the time, can not be oxidized.It is inhomogeneous that just existing reaction tower exists reactant to mix, and efficiency is low, and reaction is incomplete, and by product is also just many naturally.
Summary of the invention
Main purpose of the present utility model provides the oxidation furnaces that a kind of trimellitic acid 1,2-anhydride production is used, and this oxidation furnaces can significantly improve the degree that mixes of gas-liquid two-phase in the reaction system, improves reaction efficiency.
For achieving the above object, the technical scheme that the utility model adopted is: the oxidation furnaces that a kind of trimellitic acid 1,2-anhydride production is used, the pipeline that comprises oxidizing tower and delivering gas, the port of pipeline is positioned at the tower inner chamber bottom of oxidizing tower, the top of described pipe end is provided with guide shell, and the guide shell nozzle up and be lower than the liquid level of oxidizing tower internal liquid material.
In technique scheme, naturally still upwards flow through the pipeline expellant gas, because of its top has guide shell, so gas must enter in the guide shell, and gas is because be subjected to the acceleration of buoyancy, so quicken upwards to flow, so just in guide shell, form negative pressure region, this negative pressure can be aspirated the guide shell below naturally, just the liquid at the bottom of the tower flows into guide shell and upwards flows, and mix contact with gas and flow out on the guide shell, gas overflows liquid level then, and liquid flows to downwards at the bottom of the tower along drum outer wall.Like this in the tower liquid material reciprocally flow and in guide shell with the gas contact reacts, everywhere liquid material and the probability that touches of gas is almost equal in the tower; The reaction nature is also just more even, more abundant, and reaction efficiency is also higher.
Obviously, the equipment of technique scheme is to be used in chemical reaction that all gas-liquid two-phase raw materials carry out.
Description of drawings
Fig. 1 is the oxidizing tower structural representation of prior art;
Fig. 2 is a structural representation of the present utility model.
Embodiment
As shown in Figure 2, be example to produce trimellitic acid 1,2-anhydride, introduce design of the present utility model in detail.The oxidation furnaces that a kind of trimellitic acid 1,2-anhydride production is used, the pipeline 20 that comprises oxidizing tower 10 and delivering gas, the port of pipeline 20 is positioned at the tower inner chamber bottom of oxidizing tower 10, the top of described pipeline 20 ports is provided with guide shell 40, and guide shell 40 nozzles up and be lower than the liquid level 30 of oxidizing tower 10 internal liquid materials.
The air of discharging through pipeline 20 still upwards flows naturally like this, enter in the guide shell 40 of its top, and it is upwards mobile along the tube inwall, and the bubble of air is because be subjected to the acceleration of buoyancy, so flow velocity can be accelerated, so just in guide shell 40, form negative pressure region, this negative pressure region can aspirate guide shell 40 belows naturally, just the liquid at the bottom of the tower flows into guide shell 40 and upwards flows, after air flows out guide shell 40 upper ends, flow to tower downwards along drum outer wall more then at the bottom of.Liquid, just the flow direction of the acetum of unsym-trimethyl benzene is shown in the solid arrow among Fig. 2; The flow direction of air is shown in the dotted arrow among Fig. 2.Liquid material reciprocally flows and fully contacts with air in guide shell 40 in the tower like this, and the probability that everywhere liquid material contacts with air in the tower is almost equal; The reaction nature is also just more even, more abundant, and reaction efficiency is also higher.
Also have a unexpected benefit to be exactly when the utility model is used to produce trimellitic acid 1,2-anhydride: oxidizing reaction itself is thermopositive reaction, so guide shell 40 inner chambers are because of the material concentration height, be swift in response, temperature raises, this has significantly increased the buoyancy that air is subjected to again, then quickened the flow velocity of material in the tube, it is even to be more conducive to mixing of materials.Simultaneously 40 formed a partial warm zone in the tube, and the rising of temperature has reduced the surface tension of fluent meterial, it is more tiny that air bubble can break the ground that looses, and increases the contact area with liquid material, improves speed of response.
Further, the port of best described pipeline 20 is positioned at the mid-way of oxidizing tower 10 bottoms, the body of the tower coaxial arrangement of described guide shell 40 and oxidizing tower 10.
In the such scheme, the port of pipeline 20 and thrust-augmenting nozzle 40 all arrange on the shaft core line of body of the tower, and so especially guide shell 40 outer walls evenly equate with the downward suction force that liquid material between the body of the tower is subjected to, and are beneficial to the uniform mixing of gas-liquid two-phase more.Also can reduce the flowage friction power that the barrel of guide shell 40 is subjected to, improve the stability of equipment, avoid noise, improve service life of equipment.
As seen from the above analysis, air is convenient to by upwards flowing in the tube, being not only be positioned at the mid-way coupling with existing pipe end, is convenient to existing installation is improved, and also can play the uniform purpose of flow rate of liquid that makes each orientation, the tube outside simultaneously.The utility model is fixed a guide shell 40 with any existing technology, can improve reaction mass contact, blended degree of uniformity significantly, improves reaction efficiency.Has unexpected technique effect.
As for the concrete size of guide shell, then there is not too strict requirement, generally be according to the size of body of the tower and the transfer pressure of air, choose reasonable as long as react when carrying out, can guide gas-liquid two-phase the flow state that arrow is showed in the pie graph 2 to get final product.
As preferred version of the present utility model, the distance of described guide shell 40 upper ends and liquid level 30 is between 0.3～1m, and the distance at the bottom of 40 times end distance oxidizing towers of guide shell tower is between 0.3～1m; The barrel dliameter of guide shell 40 is 3/10 to 9/10 of an oxidizing tower body of the tower diameter.
Further, the port of described pipeline 20 is provided with gas distributor 21.
Decollator 21 just is similar to the parts of shower head and so on, as long as air can be entered in the liquid more dispersedly.The contact area that helps increasing gas-liquid two-phase like this is bigger, is beneficial to reaction and carries out fast.
Claims (4)
1. the oxidation furnaces that uses of a trimellitic acid 1,2-anhydride production, the pipeline (20) that comprises oxidizing tower (10) and delivering gas, the port of pipeline (20) is positioned at the tower inner chamber bottom of oxidizing tower (10), it is characterized in that: the top of described pipeline (20) port is provided with guide shell (40), and guide shell (40) nozzle up and be lower than the liquid level (30) of oxidizing tower (10) internal liquid material.
2. the oxidation furnaces that a kind of trimellitic acid 1,2-anhydride production according to claim 1 is used, it is characterized in that: the port of described pipeline (20) is positioned at the mid-way of oxidizing tower (10) bottom, the body of the tower coaxial arrangement of described guide shell (40) and oxidizing tower (10).
3. the oxidation furnaces that a kind of trimellitic acid 1,2-anhydride production according to claim 2 is used, it is characterized in that: the distance of described guide shell (40) upper end and liquid level (30) is between 0.3～1m, and the distance at the bottom of guide shell (40) lower end and the tower is between 0.3～1m; The barrel dliameter of guide shell (40) is 3/10 to 9/10 of oxidizing tower (a 10) body of the tower diameter.
4. according to the oxidation furnaces of claim 1 or 2 or 3 described a kind of trimellitic acid 1,2-anhydride productions uses, it is characterized in that: the port of described pipeline (20) is provided with gas distributor (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201344925U CN201990617U (en) | 2011-04-29 | 2011-04-29 | Oxidation equipment used in production of trimellitic anhydride |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201344925U CN201990617U (en) | 2011-04-29 | 2011-04-29 | Oxidation equipment used in production of trimellitic anhydride |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201990617U true CN201990617U (en) | 2011-09-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201344925U Expired - Lifetime CN201990617U (en) | 2011-04-29 | 2011-04-29 | Oxidation equipment used in production of trimellitic anhydride |
Country Status (1)
| Country | Link |
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| CN (1) | CN201990617U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106179135A (en) * | 2015-04-29 | 2016-12-07 | 中国石油化工股份有限公司 | A kind of reactor for liquid phase successive reaction and application thereof |
| CN110449112A (en) * | 2019-09-04 | 2019-11-15 | 江苏正丹化学工业股份有限公司 | A kind of pseudocumene continuous oxidation reaction device |
| CN110698446A (en) * | 2019-09-04 | 2020-01-17 | 江苏正丹化学工业股份有限公司 | Method for producing trimellitic anhydride by continuous method |
-
2011
- 2011-04-29 CN CN2011201344925U patent/CN201990617U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106179135A (en) * | 2015-04-29 | 2016-12-07 | 中国石油化工股份有限公司 | A kind of reactor for liquid phase successive reaction and application thereof |
| CN106179135B (en) * | 2015-04-29 | 2019-04-19 | 中国石油化工股份有限公司 | A kind of reactor and its application for liquid phase successive reaction |
| CN110449112A (en) * | 2019-09-04 | 2019-11-15 | 江苏正丹化学工业股份有限公司 | A kind of pseudocumene continuous oxidation reaction device |
| CN110698446A (en) * | 2019-09-04 | 2020-01-17 | 江苏正丹化学工业股份有限公司 | Method for producing trimellitic anhydride by continuous method |
| CN110698446B (en) * | 2019-09-04 | 2022-03-01 | 江苏正丹化学工业股份有限公司 | Method for producing trimellitic anhydride by continuous method |
| CN110449112B (en) * | 2019-09-04 | 2024-09-27 | 江苏正丹化学工业股份有限公司 | Continuous oxidation reactor for pseudocumene |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110928 |