CN2910344Y - Bubbling tower oxidizing apparatus for production of aromatic carboxyl acid - Google Patents
Bubbling tower oxidizing apparatus for production of aromatic carboxyl acid Download PDFInfo
- Publication number
- CN2910344Y CN2910344Y CN 200520116535 CN200520116535U CN2910344Y CN 2910344 Y CN2910344 Y CN 2910344Y CN 200520116535 CN200520116535 CN 200520116535 CN 200520116535 U CN200520116535 U CN 200520116535U CN 2910344 Y CN2910344 Y CN 2910344Y
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- damping
- tower
- internal construction
- construction member
- phase reaction
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Abstract
The utility model discloses a bubbling tower oxidizing apparatus for production of aromatic carboxyl acid, which comprises a straight canister type bubbling tower even from up to down, the top of the tower is rectification segment, while the down segment is a three-phase reaction segment. An air distributor is installed on the downside of the three-phase reaction segment. The canister of the three-phase reaction segment has a feeding pipe, and the bottom of the tower has a stuff-out pipe. A tail gas pipe and a condensation liquid reflux pipe are arranged on the top of the tower. A damp inner member is arranged in the three-phase reaction segment to hinder the liquid movement, and is in the same axis line with the tower. The utility model adopts the damp inner member to hinder the liquid movement, therefore restricting effectively the over fast velocity in the central area, making the radial of the velocity well-distributed, increasing the gas and liquid medium velocity, and favorable for enlarging and strengthening the bubbling tower reactor.
Description
Technical field
The utility model relates to a kind of device that is used for alkylaromatic hydrocarbon air liquid phase catalytic oxidation in the bubble tower oxidation unit, particularly production process that aromatic carboxylic acid uses of producing.
Background technology
Poly-basic aromatic carboxylic acid is the important source material of producing polyester (PET) fiber and resin, main at present employing alkylaromatic hydrocarbon air oxidation process is produced, this method is dissolved in the raw material alkylaromatic hydrocarbon in the acetate solvate that contains catalyst acetic acid cobalt, manganese acetate, hydrogen bromide (or tetrabromoethane), bubbling air or oxygen rich air are carried out oxidation, generate the solid product aromatic carboxylic acids.Typical reaction temperature is 120～225 ℃, pressure 0.1～2MPa, the time of staying 40～120min, reaction heat shifts out by the solvent evaporation, in the Returning reactor, the slurry of generation obtains high purity aromatic carboxylic acid product through follow-up separation and refining step again after the steam condensation.
Oxidation reactor is the core apparatus that high purity aromatic carboxylic acid (for example p-phthalic acid) is produced, and the oxidation reactor that uses has two types of stirred tank and bubble towers at present.Bubbling column reactor is a uniform up and down straight barrel type bubble tower, the tower internal upper part is that rectifying section, bottom are three phase reaction section, and gas distributor is installed below three phase reaction section, on the three phase reaction section cylindrical shell feed pipe is arranged, discharge nozzle is arranged at the bottom of the tower, and cat head is provided with offgas duct and condensate liquid return duct.Rectifying column is set above oxidation reactor separates solvent acetic acid and can directly utilize reaction heat to carry out rectifying with water to separate, favourable energy-conservation.Therefore, some patents have proposed measure that reactor and rectifying column are combined, for example patent JP14098/1979 and ZL94103145.4, patent ZL2003101078895 further proposes to adopt the bubbling column reactor that has gas fallaway section to produce terephthalic acid (TPA).But industrial bubbling column reactor maximizes at present day by day, and above-mentioned reactor all can run into certain difficulty when amplifying.A major issue during bubble tower amplifies, be the fluid axial flow velocity distribute diametrically inhomogeneous: in the tower central area, the solution-air two-phase upwards flows, and flow velocity is higher; In the zone near the tower wall, solution-air flows downward, and flow velocity is lower.Center gas holdup height, the near wall region gas holdup is low.Simultaneously, tower center two-phase flow velocity also increases along with the increase of tower diameter.Like this, when bubble tower amplifies, under high gas speed (oxidation reaction of alkylaromatic hydrocarbon promptly belongs to this situation) especially, velocity flow profile and gas holdup distribute will become more inhomogeneous.Computer simulation results shows, is the large-scale bubble tower of 6m for diameter, and when empty tower gas velocity during at 0.3 meter, central liquid speed may reach 4～5m/s, and gas speed is then higher.This just may cause gas from the short circuit of tower center, makes the gas-liquid loose contact, causes difficulty to amplification.For the oxidation reaction of alkylaromatic hydrocarbon, the short circuit of gas also can cause the rising of tail gas oxygen concentration, brings potential safety hazard.
Summary of the invention
The bubble tower oxidation unit that the production aromatic carboxylic acid that the purpose of this utility model is to provide a kind of and suppresses solution-air flow velocity inequality in the bubble tower, prevent the gas short circuit, strengthen mass transfer, amplify is easily used.
The bubble tower oxidation unit that production aromatic carboxylic acid of the present utility model is used, comprise a uniform up and down straight barrel type bubble tower, the tower internal upper part is that rectifying section, bottom are three phase reaction section, gas distributor is installed below three phase reaction section, on the three phase reaction section cylindrical shell feed pipe is arranged, have discharge nozzle, cat head to be provided with offgas duct and condensate liquid return duct at the bottom of the tower, it is characterized in that damping internal construction member, damping internal construction member and the tower body coaxial line that hinders fluid motion being installed at three phase reaction section.
The utility model is installed the damping internal construction member fluid flow and is played inhibition at the conversion zone of bubbling column reactor in the bubbling area that promptly the reactor liquid level is following, gas distributor is above.Need only satisfied for the damping internal construction member that is provided with: 1) have certain damping area perpendicular to fluid flow direction; 2) have certain circulation area, pass through to allow fluid; 3) there is the distribution of a definite form diametrically in the damping area, and in the central area, the damping area density is bigger, and outer peripheral areas damping area density is less.This is because central area rate of flow of fluid height need more damping area to come just can make flow velocity to be inhibited, and the outer peripheral areas rate of flow of fluid is less, does not need too many damping area.Therefore the damping internal construction member that the utility model proposes has intensive, the peripheral sparse feature in center.
In principle, the peripheral maximum gauge of damping internal construction member or radical length and bubbling column reactor diameter ratio can be got any numerical value (0 is the center, and 1 is the wall position) between 0～1.If but damping internal construction member diameter or length are too small then sphere of action is limited, be difficult to make the flow velocity of central area effectively to be suppressed; If there is no need,, do not need to suppress because the flow velocity outside the central area is less and the damping internal construction member diameter is excessive.Measure according to velocity flow profile, suitable damping internal construction member peripheral diameter or radical length and bubbling column reactor diameter ratio are 0.1～1.0, and preferred diameter ratio is 0.2～0.6.
Damping internal construction member comprises a plurality of damping units, the number of damping unit or packing density require to determine according to the damping to velocity flow profile: if damping unit is crossed the requirement that does not reach effective inhibition center flow velocity at least, if and damping unit too much may make flow velocity be subjected to excessive inhibition, form new uneven distribution, even form flow dead in the central area.The utility model adopts the notion of damping area density to determine the packing density of damping unit, the damping area density is defined as the damping area of damping internal construction member in the unit reactor volume, and its computing formula is: all the overall reactor of the damping area of damping internal construction members/contain inner member is long-pending.Calculate test according to a large amount of flow measurements and hydrodynamics, the suitable damping area density that the utility model provides is 0.05～5.0m
2/ m
3, preferred damping area density is 0.20～2.0m
2/ m
3In case after the value of damping area density is determined, just can calculate the size and the quantity of required damping unit.
The utility model since at bubble tower conversion zone center fixture damping internal construction member, convection cell mobile applies certain inhibition, can suppress the too fast flow velocity in central area effectively, makes the radial distribution of speed more even.Simultaneously,, promote local turbulence, improve gas-liquid mass transfer speed, process is strengthened by the interference of damping internal construction member stream field.
Description of drawings
Fig. 1 is a bubbling column reactor schematic diagram of the present utility model; Among the figure: 1 is that three phase reaction section, 2 is that damping internal construction member, 3 is that gas distributor, 4 is that rectifying section, 6 is that return duct, 7 is that offgas duct, 8 is that material feeding tube, 9 is the slurry discharge nozzle;
Fig. 2 is a radial pattern inner member cell schematics;
Fig. 3 is an annular ring inner member cell schematics;
Fig. 4 is netted inner member cell schematics;
Fig. 5 is the fin-type inner member cell schematics that is staggered;
Fig. 6 is liquid axial velocity profile figure, and abscissa R is the dimensionless radial coordinate among the figure, is defined as radial coordinate/bubble tower radius, and R=0 is the center, and R=1 is the wall position; The liquid axial velocity of ordinate for measuring, speed are upwards to flow on the occasion of expression, and negative value is represented to flow downward.
The specific embodiment
With reference to Fig. 1, produce the bubble tower oxidation unit that aromatic carboxylic acid is used, comprise a uniform up and down straight barrel type bubble tower, the tower internal upper part is a three phase reaction section 1 for rectifying section 4, the bottom of being made up of multilayer tower tray or filler, gas distributor 3 is installed below three phase reaction section 1, feed pipe 8 is arranged on the three phase reaction section cylindrical shell, discharge nozzle 9 is arranged at the bottom of the tower, cat head is provided with offgas duct 7 and condensate liquid return duct 6, it is characterized in that the damping internal construction member 2 that hinders fluid motion being installed damping internal construction member 2 and tower body coaxial line at three phase reaction section.In the diagram instantiation, damping member 2 is made up of vertical rod and a plurality of damping unit that the bottom is fixed on bubble tower bottom or the gas distributor.A plurality of damping units perpendicular to vertical rod and vertically each interval be installed in the vertical rod.The damping unit fluid flow plays inhibition, its shape can be a various ways, for example can be radial pattern structure sheet (Fig. 2), also can be the annular ring (Fig. 3) that connects of concentric circles or central area damping circular net (Fig. 4) greater than the outer peripheral areas damping, or staggered fin-type structure (Fig. 5).
The installation of damping internal construction member 2 can be adopted multiple mode, for example also can each damping unit or damping unit combination radially be strained unsettled being fixed on the bubble tower three phase reaction section cylindrical shell wall with many one metal wires or thin bar.
At diameter is the axle central area of the bubbling column reactor of 500mm, high 4000mm, in the conversion zone of the top of gas distributor and bubble tower liquid level below by the fixing damping member of a central upright stanchion, damping member has 14 actinomorphic damping units as shown in Figure 2, its diameter is 250mm, adjacent damping unit spacing is 200mm, damping unit bottom is apart from gas distributor 200mm, and damping unit topmost flushes with liquid level.The damping area density is 0.35m
2/ m
3
Experiment is carried out in air-aqueous systems, and the later liquid level of bubbling is 3000mm, empty tower gas velocity 0.62m/s.Midpoint between distance distributor 2250mm, two damping units is measured Different Diameter to locational axial velocity, and the fluid velocity radial distribution after more not adding damping internal construction member then and damping internal construction member being installed the results are shown in Fig. 6.
The velocity flow profile of void tower reactor is inhomogeneous, central area liquid speed is up to 1.2m/s, and after adding damping internal construction member, outwards move the position that Peak Flow Rate occurs, maximum also drops to 0.88m/s, illustrates that adding damping internal construction member has suppressed the too high rate of flow of fluid in central area afterwards effectively.
Experiment condition is identical with embodiment 1, adopts chemical absorption method to measure gas-liquid mass transfer speed, the gas Liquid Mass Transfer Coefficient k after more not adding damping internal construction member then and damping internal construction member being installed
lα the results are shown in table 1.
The gas Liquid Mass Transfer Coefficient of void tower reactor is 0.41, adds after the damping internal construction member described in the embodiment 1, and mass tranfer coefficient is increased to 0.49, and mass transfer rate has improved 20%.Hydrodynamic turbulence has been strengthened in the interference that the damping internal construction member stream field is described, has significantly improved mass transfer rate.
The bubble tower gas Liquid Mass Transfer Coefficient that table 1 void tower is measured when adopting different inner member size
| Experiment condition | The undamped | Embodiment | 2 | Comparative Examples 3 | Comparative Examples 4 |
| Mass tranfer coefficient k lα(l/s) | 0.41 | 0.49 | 0.43 | 0.55 |
Comparative Examples 1
In flow-speed measurement experiment, the number of damping unit in the reactor is doubled, adjacent damping unit spacing narrows down to 100mm, the damping area of the damping internal construction member that the unit volume reactor comprises, promptly the damping area density is 0.7m
2/ m
3, other condition is identical with embodiment 1.Measurement result also is shown in Fig. 6.Can see that therefrom though the flow velocity of central area significantly reduces after the adding damping internal construction member, flow velocity is subjected to excessive inhibition, especially in the position near central axis, almost forms the dead band.The damping area density that this routine damping internal construction member is described is excessive.Certainly, if improve the inner member cellular construction, suitably reduce the damping area at center position, the damping member of this area density also is desirable.
Comparative Examples 2
In flow-speed measurement experiment, with one times of the decreased number of damping unit in the reactor, adjacent damping unit spacing increases to 400mm, and the damping area density is 0.18m
2/ m
3, other condition is identical with embodiment 1.Measurement result also is shown in Fig. 6.Can see that therefrom owing to the damping area density of damping internal construction member is too little, the flow rate of liquid distribution approaches the distribution under the void tower situation, illustrates that the damping unit number is very few, the damping area density is not enough, to the not effectively inhibition of formation of flow velocity of central area.
Comparative Examples 3
In gas-liquid mass transfer experiment, the diameter of damping unit is reduced to 120mm from 250mm, the damping area density is from 0.35m
2/ m
3Be reduced to 0.18m
2/ m
3, other condition is identical with embodiment 1.The gas Liquid Mass Transfer Coefficient k that measures
lThe α value is also listed in table 1.Can see that because the damping internal construction member diameter is too small, the influence that the convection cell turbulence applies is limited, significant change does not take place in mass tranfer coefficient.
Comparative Examples 4
In gas-liquid mass transfer experiment, the diameter of damping unit is increased to 480mm from 250mm, the damping area density is from 0.35m
2/ m
3Increase to 0.65m
2/ m
3, other condition is identical with embodiment 1.The gas Liquid Mass Transfer Coefficient k that measures
lThe α value is also listed in table 1.Can see that adopt diameter to approach the damping internal construction member of tower diameter, mass tranfer coefficient can be increased, but its amplitude reduces.As adopt the damping internal construction member of 250mm diameter can improve mass transfer rate 20%, and adopt the damping internal construction member of 480mm diameter can only improve mass transfer rate 10% on this basis again.
After above-mentioned example explanation adds damping internal construction member, both the excessive flow velocity of bubble tower core can be suppressed effectively, and gas-liquid mass transfer speed can be significantly improved again.Also be not difficult to infer from above-mentioned example, adopt the more complicated inner member of shape, make its damping area radial distribution meet certain requirements, can also obtain more even velocity distribution of center, enumerate no longer one by one.Any improvement for the damping internal construction member shape all belongs to the scope of the present invention's definition, can not change technical characterictic of the present invention.
Claims (8)
1, produces the bubble tower oxidation unit that aromatic carboxylic acid is used, comprise a uniform up and down straight barrel type bubble tower, the tower internal upper part is that rectifying section (4), bottom are three phase reaction section (1), in the below of three phase reaction section (1) gas distributor (3) is installed, feed pipe (8) is arranged on the three phase reaction section cylindrical shell, discharge nozzle (9) is arranged at the bottom of the tower, cat head is provided with offgas duct (7) and condensate liquid return duct (6), it is characterized in that the damping internal construction member (2) that hinders fluid motion being installed damping internal construction member (2) and tower body coaxial line at three phase reaction section.
2, bubble tower oxidation unit according to claim 1 is characterized in that damping internal construction member (2) is made up of the vertical rod that is fixed on tower body axle center and a plurality of damping unit, a plurality of damping units perpendicular to vertical rod and vertically each interval be installed in the vertical rod.
3. bubble tower oxidation unit according to claim 2 is characterized in that said damping unit is a radial pattern structure sheet, or the annular ring that connects of concentric circles, or the central area damping is greater than the circular net of outer peripheral areas damping, or staggered fin.
4. bubble tower oxidation unit according to claim 1 and 2, the damping area that it is characterized in that damping internal construction member (2) at radial center zone damping area density greater than outer peripheral areas damping area density.
5. bubble tower oxidation unit according to claim 1 and 2 is characterized in that the maximum gauge of damping internal construction member (2) or radical length and the ratio of reactor diameter are 0.1～1.0.
6. bubble tower oxidation unit according to claim 1 and 2 is characterized in that the maximum gauge of damping internal construction member (2) or radical length and the ratio of reactor diameter are 0.2～0.6.
7, bubble tower oxidation unit according to claim 1 and 2, the damping area that it is characterized in that the damping internal construction member that the unit reactor volume is comprised is 0.05～5.0m
2/ m
3
8, bubble tower oxidation unit according to claim 1 and 2, the damping area that it is characterized in that the damping internal construction member that the unit reactor volume is comprised is 0.20～2.0m
2/ m
3
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520116535 CN2910344Y (en) | 2005-11-18 | 2005-11-18 | Bubbling tower oxidizing apparatus for production of aromatic carboxyl acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520116535 CN2910344Y (en) | 2005-11-18 | 2005-11-18 | Bubbling tower oxidizing apparatus for production of aromatic carboxyl acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2910344Y true CN2910344Y (en) | 2007-06-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520116535 Expired - Fee Related CN2910344Y (en) | 2005-11-18 | 2005-11-18 | Bubbling tower oxidizing apparatus for production of aromatic carboxyl acid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2910344Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102675090A (en) * | 2012-05-15 | 2012-09-19 | 中国昆仑工程公司 | Deep oxidation method and deep oxidation device in KPTA (Kunlun pure terephthalic acid) production |
| CN105498647A (en) * | 2014-10-14 | 2016-04-20 | 中国石油化工股份有限公司 | Fluidized bed reactor, reaction apparatus and olefin preparation method and aromatic preparation method |
-
2005
- 2005-11-18 CN CN 200520116535 patent/CN2910344Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102675090A (en) * | 2012-05-15 | 2012-09-19 | 中国昆仑工程公司 | Deep oxidation method and deep oxidation device in KPTA (Kunlun pure terephthalic acid) production |
| CN102675090B (en) * | 2012-05-15 | 2015-09-23 | 中国昆仑工程公司 | Deep oxidation method in polymerization-grade Production of Terephthalic Acid and deep oxidation device |
| CN105498647A (en) * | 2014-10-14 | 2016-04-20 | 中国石油化工股份有限公司 | Fluidized bed reactor, reaction apparatus and olefin preparation method and aromatic preparation method |
| CN105498647B (en) * | 2014-10-14 | 2018-07-03 | 中国石油化工股份有限公司 | Fluidized-bed reactor, consersion unit and olefin preparation method and aromatic hydrocarbons preparation method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |