CN1090990C - Catalytic rectifying tower - Google Patents
Catalytic rectifying tower Download PDFInfo
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- CN1090990C CN1090990C CN00111945A CN00111945A CN1090990C CN 1090990 C CN1090990 C CN 1090990C CN 00111945 A CN00111945 A CN 00111945A CN 00111945 A CN00111945 A CN 00111945A CN 1090990 C CN1090990 C CN 1090990C
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- rectifying
- catalytic
- structured packing
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- catalyst
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Abstract
The present invention provides a catalytic rectifying tower. A rectifying section component of the catalytic rectifying tower is composed of a plurality of rectifying component units which are piled in an overlapping mode. The rectifying component unit comprises two small units which are complemented up and down. The small unit comprises one or at least two regular filler elements which are alternately combined and one or at least two catalytic agent elements which are alternately combined. The component has a large flow channel and is particularly suitable for the catalytic rectifying technology between reaction mass and a gaseous medium with high inert components and low active components. Contact between steam (gas) and liquid is adequate. Fluid ditch flow and a short-circuit phenomenon are eliminated. The present invention has the advantages of little resistance, good effect of reaction and separation, adequate moisture of a catalytic agent, long service life, simple component manufacture and convenient assembly and disassembly.
Description
The invention belongs to technical field of chemical, relate to a kind of catalytic rectifying tower, relate in particular to a kind of inner member of catalytic rectifying tower.
Catalytic rectifying tower is a kind of important chemical equipment, and its inner member then is the core component of catalytic rectifying tower, and the quality of its performance will directly influence the efficient of catalytic distillation process, and for this reason, many patents and document disclose or reported various types of inner members, as:
U.S. Pat P4443599, USP4242530 and Japan Patent clear 5912749 proposed respectively catalyst is put into bagging that glass fibre or ion exchange resin felt make as catalyst element, be rolled into the filler inner member that harness is formed catalytic rectifying tower with the silk screen elastomer again, place in the catalytic rectifying tower.Because the transmission of reactant and product all need be passed through bagging, the mass transfer diffusion process is obstructed, and has a strong impact on the carrying out of course of reaction, and general reaction efficient is not high and the member manufacturing is complicated, the processing charges costliness.
Chinese patent 921038.8 and European patent 0428265 try hard to overcome the defective of above-mentioned patent, the filler inner member of the catalytic rectifying tower of another kind of type has been proposed respectively, catalyst filling between the ripple web plate, the full contact of its gas-liquid two-phase, similar to structured packing have a higher voidage, liquid-solid abundant contact, the transmission resistance is little, but this member voidage is big, there is the gas straight passage, have serious gas short circuit, when carrying out catalytic distillation with the very low non-pure component gas reaction medium of active principle content, its reaction efficiency is very low.
The inert particle that European patent 0448884 and 0476938 proposes respectively there are cavity and a large surface area in the center is evenly mixed with catalyst after with the silk screen bale packing and is positioned over the filler inner member and the catalyst that constitute catalytic rectifying tower in the catalytic rectifying tower and is positioned in the metal wire casing space, there is metal wire casing to constitute the filler inner member of catalytic rectifying tower, these two kinds of members is intended that the certain free space of formation in the filler inner member of catalytic rectifying tower in a word, the passage that flows as gas-liquid two-phase influences the efficient of reactive distillation but this class A of geometric unitA is difficult to avoid the channel of gas-liquid two-phase and short circuit phenomenon.
It is little to the object of the present invention is to provide a kind of its inner member to have an alternate transmission resistance, can avoid vapour (gas) liquid two-phase channel and short circuit again, takes into full account the new catalytic rectifying column of catalytic distillation process characteristics again.
Design of the present invention is such:
Inner member for catalytic rectifying tower, generally should satisfy following basic demand: at first, the inner member of catalytic rectifying tower should leave the circulation passage of enough vapour (gas) liquid two-phase, the decline liquid phase can be reacted by mobile from top to bottom smoothly contact catalyst, rising vapour phase (gas phase) can not cause liquid flooding by the inner member of catalytic rectifying tower, when reaction mass is that inert component content is very high and during gas medium that active principle content is very low, the inner member of catalytic rectifying tower has enough circulation passages and seems particularly important; Secondly, the inner member of catalytic rectifying tower must have sufficient mass transfer surfaces, is beneficial to the carrying out of the mass transport process of rectifying, when a reaction medium is the very low non-pure component gas medium of active principle content, absorption process also has material impact, and sufficient sorbent surface becomes more important; The 3rd, the inner member of catalytic rectifying tower must be convenient to make, and is convenient to installation and removal; In addition, price also is the factor of can not ignore.According to above principle, the inventor thinks the inner member of the catalytic rectifying tower that can adopt following structure:
1 catalytic distillation member adopts the mode of structured packing and the alternate combination of catalyst element to constitute, and the high voidage that utilizes structured packing provides enough circulation passages for rising steam and gas-phase reaction medium;
2 adjacent two layers catalytic distillation members, if the upper strata is structured packing, then lower floor corresponds to catalyst element; If the upper strata be catalyst element then lower floor correspond to structured packing, and always the radial dimension of catalyst element greater than the yardstick of structured packing, this form has guaranteed that all reaction masses all must contact catalyst, avoid the channel and the short circuit of vapour phase (gas phase) medium, thereby guaranteed reaction effect;
3 upper ends one deck structured packings at adjacent two layers or multilayer catalytic distillation member, so constitute a complete catalytic distillation unit, this layer structured packing both provided mass transfer surfaces, help the radially mixing of liquid phase simultaneously, also help the even distribution of liquid in the tower, the placement structured packing is more effective for the major diameter tower;
4 catalyst elements adopt the box structure of porous, and vapour (gas) liquid phase transmittance process resistance is low, make catalyst loading and unloading convenient, simple to operate.
According to above-mentioned design, the present invention proposes technical scheme as described below:
The said catalytic rectifying tower of the present invention comprises tower body, rectifying section member and stripping section member.
Said rectifying section member is made up of the overlapping accumulation of a plurality of rectifying member units;
Said rectifying member unit comprises the junior unit of " complementation " about in the of two;
Said junior unit comprises one or more structured packing element and one or more catalyst element, two kinds of alternate combinations of element, and in this junior unit, the sum of structured packing element and catalyst element is good with odd number;
Said " complementation ", if promptly the upper strata is a catalyst element, then lower floor is corresponding is the structured packing element; If the upper strata is the structured packing element, then lower floor should be catalyst element relatively, and the width of catalyst element should be slightly larger than the width of corresponding structured packing element.
In catalytic distillation operation, on same tower cross section, the distribution of dropping liq is uniformly substantially, thereby makes behind the rectifying member unit of liquid contact " complementation " the essentially identical extent of reaction is arranged, and has prevented the back-mixing of liquid phase and the channel of vapour phase (gas phase); The structured packing element of big voidage provides enough big gas passage for uprising gas, particle diameter in the catalyst filling zone territory owing to catalyst is generally less, the catalyst layer voidage is not high, allow by gas speed restricted, can operate closing under the spotting out in this zone, make this zone keep bigger liquid holdup, help the fully wetting of catalyst, to prolong the service life of catalyst.
Above-mentioned a plurality of complementary up and down overlapped being deposited in together of rectifying member unit directly is installed on the support member in the tower body, is the catalytic distillation section member of said catalytic rectifying tower.
Be operating as principle with conveniently assemble and disassemble, for large diameter rectifying column, tower section can be divided into several zones, the compound mode of structured packing element and catalyst element is same as described above in each zone.
The width of catalyst element and structured packing element is good with 20-400mm, and highly also in the 20-400mm scope, the ratio of the shared card of catalyst element should be best with 50%～80% greater than 50%.
For the ease of installing and maintenance, catalyst element can be made a porous box, so that from the tower manhole, load and unload.
For big mass transfer area is provided, the respond that inner member is had absorbs with the gas-phase reaction medium and the rectifying separating power adapts, can be at above-mentioned two or more rectifying member unit upper and lower settings structured filling material layers with complementation.Overlapped the combining of rectifying member unit that this is provided with structured filling material layer can constitute the catalytic distillation section of the catalytic rectifying tower of another kind of form.Owing to the mass transfer ability of the structured packing difference along with its tower height degree of living in position changes, the height of higher one deck structured packing and the product of specific area are 1 to 5 times of its lower floor.This structured filling material layer also can be the gas-liquid two-phase rectification, obtains comparatively ideal velocity flow profile, thereby improves the efficient of catalytic distillation.
Below will be described in detail the present invention by accompanying drawing.
Fig. 1 catalytic rectifying tower structural representation.
Fig. 2 rectifying member unit schematic diagram.
A---A is to schematic diagram among Fig. 3 Fig. 2.
Fig. 4 major diameter catalytic rectifying tower cross sectional representation.
Fig. 5 porous box structural representation.
Fig. 6 porous plate schematic diagram.
Fig. 7 is provided with the rectifying member unit schematic diagram of structured packing.
As seen from Figure 1, said rectifying column comprises tower body 1, rectifying section member 2 and stripping section member 7, and said rectifying section member 2 is made up of a plurality of rectifying member unit 4 overlapping accumulations;
By Fig. 2 and Fig. 3 as seen, said rectifying member unit 4 comprises two junior units of two-layer " complementation " up and down, this junior unit comprises one or more structured packing element 10 and one or more catalyst element 9, two kinds of alternate combinations of element, in this junior unit, structured packing element 10 and catalyst element 9 add up to odd number.Said " complementation ", promptly the upper strata is a catalyst element 9, lower floor is corresponding to be structured packing element 10; The upper strata is a structured packing element 10, and then lower floor should be catalyst element 9 relatively, and the width D of catalyst element 9 is slightly larger than the width L of corresponding structured packing element 10.
Above-mentioned a plurality of complementary up and down rectifying member unit 4 overlapped being deposited in together are installed on the support member 5 in the tower body, are the catalytic distillation section member 2 of catalytic rectifying tower.
The width D of catalyst element 9 and structured packing element 10 and L are good with 20-400mm, and also in the 20-400mm scope, the ratio of catalyst element 9 shared cards should be best with 50%～80% greater than 50% to height H.
As seen from Figure 4, for large diameter rectifying column, for the ease of installing and maintenance, can be with each junior unit zoning territory, regional inner catalyst element 9 and structured packing element 10 all make up in above-mentioned mode.
As seen from Figure 5, catalyst element 9 can be made a porous box 11, so that from the tower manhole, load and unload.This porous box 11 can be made of stephanoporate steel plate, woven wire or other porous materials, requires this material operating use steady in a long-term under the operating mode, and the height of this porous box 11 and width are 20～400mm.
As shown in Figure 6, this porous box 11 and structured packing element 10 adjacent sides are provided with the porous plate of not perforate section 12 and perforate section 13, the purpose that not perforate section 12 is provided with is to prevent long-term use of catalyst and caused local channel of sedimentation or short circuit, and the height of not perforate section 12 is 10% to 50% of a porous plate height overall.
As shown in Figure 7, for big mass transfer area is provided, make the respond that inner member has and the gas-phase reaction medium absorbs and the rectifying separating power adapts, can be at above-mentioned two or more complementary rectifying member unit 4 upper and lower settings structured filling material layers 14 that have.Rectifying member unit 4 overlapped the combining that this is provided with structured filling material layer 14 can constitute the catalytic distillation section member of the catalytic rectifying tower of another kind of form.Owing to the mass transfer ability of the structured packing difference along with its tower height degree of living in position changes, the height of higher one deck structured packing 14 and the product of specific area are 1 to 5 times of its lower floor.This structured filling material layer 14 also can be the gas-liquid two-phase rectification, obtains comparatively ideal velocity flow profile, thereby improves the efficient of catalytic distillation.
According to technological requirement, in rectifying column, said rectifying section member 2 can all adopt above-mentioned rectifying member unit 4, also can be combined with the member of other type, and as the filler of various routines etc., this is also at this
Within the scope of invention.
Used catalyst will determine that structured packing can be adopted conventional structured packing according to different technology.
The operation of the said catalytic rectifying tower of the present invention is identical with conventional catalytic rectifying tower, and material enters in the tower at the charging aperture 6 of rectifying column, and the product behind the catalytic distillation flows out rectifying column by discharging opening at the bottom of cat head discharging opening 3 and the tower 8 respectively.
The catalytic rectifying tower inner member that adopts the present invention to propose compared with prior art has the following advantages:
1. the catalytic rectifying tower inner member has enough circulation passages, generally is applicable to reactive distillation, is specially adapted to the catalytic rectification process that reaction mass and inert component are very high, active principle hangs down the gas medium of percentage;
2. vapour (gas) liquid two-phase full contact has been eliminated fluid channel and short circuit phenomenon, and it is little that process is transmitted resistance, reaction and good separating effect;
3. guarantee that catalyst is fully wetting, help prolonging catalyst service life;
4. the manufacturing of catalytic distillation member is simple, easy to loading and unloading.
The catalytic rectifying tower that is used for the preparing ethylbenzene from dry gas of diameter 50mm, catalyst adopt and improve the β zeolite, and wave height 2.3mm is adopted in structured packing, height 25mm, and catalytic distillation member height 25mm, the high 50mm of two complementary catalytic distillation members loads the 2m height altogether.In ethylene feed concentration 16%, ethene air speed 0.28, benzene alkene is than 2.5, and under the condition such as 160-180 ℃ of catalytic distillation temperature, conversion ratio is greater than 95%, and ethylbenzene selectivity is greater than 95%.
The catalytic rectifying tower that is used for the pure ethylene system ethylbenzene of diameter 30mm, catalyst adopt HY type molecular sieve catalyst, and wave height 2.3mm is adopted in structured packing, height 15mm, and catalytic distillation member height 15mm, the high 30mm of two complementary catalytic distillation members loads the 1.2m height altogether.In ethylene feed concentration 99.9%, benzene alkene is than 2 to 5, and under the condition such as 200 ℃ of catalytic distillation temperature, conversion ratio is greater than 100%, and ethylbenzene and many ethylbenzene selectivity are greater than 99.7%.
Claims (6)
1. a catalytic rectifying tower comprises tower body (1), rectifying section member (2) and stripping section member (7), it is characterized in that, said rectifying section member (2) comprises the overlapping accumulation composition of a plurality of rectifying member units (4);
Said rectifying member unit (4) comprises two junior units of two-layer " complementation " up and down, this junior unit comprises one or more structured packing element (10) and one or more catalyst element (9), two kinds of alternate combinations of element, the width (D) of catalyst element (9) is greater than the width (L) of the structured packing element (10) of correspondence;
Above-mentioned a plurality of complementary up and down overlapped accumulation of rectifying member unit (4) is installed on the support member (5) in the tower body.
2. rectifying column as claimed in claim 1 is characterized in that, the width (D) of catalyst element (9) and structured packing element (10) and (L) be 20-400mm, and highly (H) is 20-400mm.
3. rectifying column as claimed in claim 1, it is characterized in that, at above-mentioned two or more complementary rectifying member unit (4) upper and lower settings structured filling material layers (14) that have, the height of higher one deck structured packing (14) and the product of specific area are 1 to 5 times of its lower floor.
4. rectifying column as claimed in claim 1, it is characterized in that, catalyst element (9) is a porous box (11), the side that said porous box (11) is adjacent with structured packing element (10) is provided with the porous plate of not perforate section (12) and perforate section (13), and the height of not perforate section (12) is 10% to 50% of a porous plate height overall.
5. rectifying column as claimed in claim 2, it is characterized in that, catalyst element (9) is a porous box (11), the side that said porous box (11) is adjacent with structured packing element (10) is provided with the porous plate of not perforate section (12) and perforate section (13), and the height of not perforate section (12) is 10% to 50% of a porous plate height overall.
6. rectifying column as claimed in claim 3, it is characterized in that, catalyst element (9) is a porous box (11), the side that said porous box (11) is adjacent with structured packing element (10) is provided with the porous plate of not perforate section (12) and perforate section (13), and the height of not perforate section (12) is 10% to 50% of a porous plate height overall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00111945A CN1090990C (en) | 2000-03-08 | 2000-03-08 | Catalytic rectifying tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00111945A CN1090990C (en) | 2000-03-08 | 2000-03-08 | Catalytic rectifying tower |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1266736A CN1266736A (en) | 2000-09-20 |
| CN1090990C true CN1090990C (en) | 2002-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00111945A Expired - Fee Related CN1090990C (en) | 2000-03-08 | 2000-03-08 | Catalytic rectifying tower |
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| Country | Link |
|---|---|
| CN (1) | CN1090990C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102824752A (en) * | 2011-06-16 | 2012-12-19 | 徐志刚 | Catalytic distillation tower |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4242530A (en) * | 1978-07-27 | 1980-12-30 | Chemical Research & Licensing Company | Process for separating isobutene from C4 streams |
| CN1065412A (en) * | 1992-05-28 | 1992-10-21 | 华东化工学院 | High-efficient packing for catalytic rectification |
| CN2314840Y (en) * | 1997-07-15 | 1999-04-21 | 清华大学 | Novel catalytic rectifying tower |
-
2000
- 2000-03-08 CN CN00111945A patent/CN1090990C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4242530A (en) * | 1978-07-27 | 1980-12-30 | Chemical Research & Licensing Company | Process for separating isobutene from C4 streams |
| CN1065412A (en) * | 1992-05-28 | 1992-10-21 | 华东化工学院 | High-efficient packing for catalytic rectification |
| CN2314840Y (en) * | 1997-07-15 | 1999-04-21 | 清华大学 | Novel catalytic rectifying tower |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102824752A (en) * | 2011-06-16 | 2012-12-19 | 徐志刚 | Catalytic distillation tower |
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| Publication number | Publication date |
|---|---|
| CN1266736A (en) | 2000-09-20 |
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Granted publication date: 20020918 Termination date: 20100308 |