CN105498266B - A kind of catalytic distillation structured packing modularization installation method and device - Google Patents
A kind of catalytic distillation structured packing modularization installation method and device Download PDFInfo
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- CN105498266B CN105498266B CN201610060898.0A CN201610060898A CN105498266B CN 105498266 B CN105498266 B CN 105498266B CN 201610060898 A CN201610060898 A CN 201610060898A CN 105498266 B CN105498266 B CN 105498266B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/0015—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/02—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with stationary particles, e.g. in fixed beds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
- B01J2208/00008—Controlling the process
- B01J2208/0061—Controlling the level
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
- B01J2208/00743—Feeding or discharging of solids
- B01J2208/00752—Feeding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
- B01J2208/00743—Feeding or discharging of solids
- B01J2208/00769—Details of feeding or discharging
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The present invention discloses a kind of catalytic distillation structured packing modularization installation method and device, including tower body, packing support circle and catalytic distillation structured packing tower tray, catalytic distillation structured packing tower tray includes several parallel zones, several parallel zones are divided into single module installation region and multimode installation region, and single module installation region and multimode installation region are made of the installation of filler module；Filler module is made of several modular units, modular unit is made of the catalyst module and fenestration packing sheet alternately placed, catalyst module includes catalyst and module packet, and module packet is welded by fenestration packing sheet with silk screen, and catalyst is filled in module packet.The present apparatus proposes the innovative idea of modularization installation, presses portion's construction and installation mode compared to tradition, on the one hand improves the gas-liquid mass transfer heat transfer efficiency of object system in tower, on the other hand shorten construction period, greatly enhance installation effectiveness.
Description
Technical field
The invention belongs to chemical industry catalytic rectification process fields, and in particular to a kind of catalytic distillation structured packing modularization
Installation method and device.
Background technique
Catalytic distillation separates catalysis reaction with rectifying and organically combines, and reacts and rectifying individually carries out with traditional
Process compare, have the advantages that uniqueness.For the basic demand for meeting reaction and rectifying, filling installation side of the catalyst in tower
Formula must satisfy following condition: (1) making the catalyst bed of conversion zone has enough free spaces, and the flowing for providing liquid phase is logical
Road, to carry out liquid phase reactor and gas-liquid mass transfer；These effective spaces should reach separating effect possessed by general filler, with
And the tray gradient that design allows.(2) there is enough surface areas to carry out catalysis reaction；(3) allow the swollen of catalyst granules
Swollen and contraction, without damaging catalyst.
Catalytic rectification process key is the structure design and installation of reactive end catalyst bed.Due to catalytic distillation process
In catalyst not only play catalytic action, but also play the role of mass transfer surfaces, thus do not require nothing more than catalyst module structure have compared with
High catalytic efficiency, while having preferable separative efficiency again.Currently, being mainly that ion is handed over for the catalyst in catalytic distillation
Resin and molecular sieve are changed, catalyst must take special filling mounting means.To the Catalyst packing mounting means occurred
It is divided into two classes, i.e. fixed-bed type and structured packing formula, has successful application example in these two types of types of feed.
Structured packing type catalyst loading pattern is more suitable for distillation operation, and gas-liquid contact is good, and special structure is not needed in tower
Part, catalyst utilization are high.But the catalyst change in this type of feed is difficult, manually replaces into tower after needing to stop.
Sulzer company is Katpak type filler using new catalytic fractional distillation filling-material, has hydrodynamic performance test to grind with what hot-die was tested
Study carefully report.Conversion zone uses special catalyst loading pattern, generally has 3 kinds of modes: (1) by granular catalyst and inert filler
It loads in mixture, the advantages of method is that catalyst loading and unloading is convenient, but finely grained catalyst is deposited in tower and causes upflowing vapor resistance excessive；
(2) granular catalyst is placed in porous container and forms catalyst structure, porous container can be the braided fabrics such as nylon yarn, can also
To be the silk screen of the materials such as aluminium, stainless steel；This catalyst structure must be connected to form catalytic distillation element with elastic component again,
And there is biggish open pore space；This modes of emplacement application is wider, but because catalyst is placed in porous container, diffusion couple reaction
It has a certain impact, and component is complicated.(3) catalyst granules is put into the interlayer of wavy metal silk screen or flat bed screen and porous
In the interlayer of sheet frame.This modes of emplacement mass transfer effect is good, but loads and unloads trouble.
Summary of the invention
Goal of the invention: present invention aims in view of the deficiencies of the prior art, provide a kind of easy to loading and unloading, internal drag
Small, high catalytic efficiency catalytic distillation structured packing modularization installation method and device.
Technical solution: a kind of catalytic distillation structured packing modular mounting arrangement of the present invention, including tower body, filler
Bracing ring and catalytic distillation structured packing tower tray, the packing support circle are mounted in the tower body, and the catalytic distillation is regular
Filler tower tray is mounted on the packing support circle, and the catalytic distillation structured packing tower tray includes several parallel zones, described
Several parallel zones are divided into single module installation region and multimode installation region, the single module installation region and multimode installation
Region is made of the installation of filler module；
The filler module is made of the installation of several modular units, and the modular unit is by the catalyst module alternately placed
It is constituted with fenestration packing sheet, the catalyst module includes catalyst and module packet, and the module packet is by fenestration packing sheet
It is welded with silk screen, the catalyst is filled in the module packet.
Further, for convenient for constructing, installing, the single module installation region is the catalytic distillation structured packing tower tray
The parallel zone at both ends, parallel zone of the multimode installation region between the single module installation region.
Further, the single module installation region is made of the installation of single filler module；The multimode installation region
It is made of 2 ~ 50 filler module installations.
Further, the combination of modular unit is that 1 ~ 10 layer of fenestration packing sheet adds 1 ~ 10 layer in the filler module
Catalyst module.
Further, it is marked to improve installation accuracy and efficiency, the single module installation region and multimode installation region
Know unique radio frequency encoding.
Further, for convenience of concrete condition in detection tower, the present apparatus further includes special catalytic distillation structured packing tower tray,
The special catalytic distillation structured packing tower tray includes the catalytic distillation structured packing tower tray and detection device that mounting hole is arranged, institute
State detection device installation in the mounting hole.
The present invention also provides a kind of new catalytic rectifying structured packing modularization installation methods, comprising the following steps:
(1) module divides: according to the requirement of mounting process, in a pre-installation by circular mounting region division at several subregions
Domain, and radio frequency encoding is identified in each subregion；
(2) prepared by module: fenestration packing sheet and silk screen being welded into module packet, the catalyst filling and again into module packet
Secondary suture forms catalyst module；The catalyst module and fenestration packing sheet are pressed to 1 ~ 10 plus 1 ~ 10 combination group
Die-filling module unit；The modular unit is arranged successively, filler module is obtained；
(3) module is installed: it is encoded using radio frequency identification, filler module is installed by the zone location divided in step (1),
Obtain catalytic distillation structured packing tower tray；Mounting hole is set on catalytic distillation structured packing tower tray, inspection is installed in mounting hole
Measurement equipment obtains special catalytic distillation structured packing tower tray；Packing support circle is installed in catalytic rectifying tower, then according to technique
It needs for catalytic distillation structured packing tower tray and special catalytic distillation structured packing tower tray to be mounted on the packing support circle, so
Filler pressing and distributor are fixed afterwards, complete module installation；
(4) modular debugging is run: after being installed, first air tightness test is carried out to catalytic rectifying tower, then with reagent pair
Catalytic rectifying tower is cleaned, and the moisture in filler and catalyst is taken away.
Further, to be easily installed, the catalytic distillation structured packing tower tray is pressed from bottom to top during the installation process
Sequence is installed；For the contact area for improving material and catalyst, catalytic efficiency, upper layer catalytic distillation structured packing tower tray phase are improved
0 ~ 90 ° is rotated in the same direction for lower catalyst rectifying structured packing tower tray.
Further, upper layer catalytic distillation structured packing tower tray is relative to lower catalyst rectifying structured packing tower tray along same
Direction is rotated by 90 °.
It further, is guarantee inner-tower filling material regularity, surface irregularity≤D/500 of the packing support circle is described
D is tower internal diameter.
The utility model has the advantages that (1) compared to tradition bale packing catalyst installation, the invention proposes modularization installation innovative idea,
Modularization installation method positions each tower tray module using radio frequency identification number, it is ensured that module product uniquely distinguishing in projects
Knowledge and magnanimity, each filler module are installed in strict accordance with block diagram, and assembling is simple, and connection flexibly, has a degree of reusable
Rate not only saves manpower, cost input, but also greatly improves installation accuracy and efficiency；(2) present apparatus is by adjusting catalyst
Loadings, the combined method of catalyst module and common fillers piece and module draw grading mode, realize conversion zone structured packing
Modularization installation, compared to tradition press portion's construction and installation mode, on the one hand improve the gas-liquid mass transfer heat transfer efficiency of object system in tower,
On the other hand construction period is shortened, greatly enhances installation effectiveness, meanwhile, this method can effectively meet novel regular
The requirement of high quality installation in filler transport, lifting and tower；(3) present apparatus structure is simple and convenient to operate, is adaptable, easily
It realizes industrialization promotion, there are preferable market prospects.
Detailed description of the invention
Fig. 1 is that the module of catalytic distillation structured packing tower tray in embodiment 1 divides floor map；
Fig. 2 is the top view of multilayer catalytic distillation structured packing tower tray in embodiment 1；
Fig. 3 is that the module of special catalytic distillation structured packing tower tray in embodiment 1 divides floor map；
Fig. 4 is partial elevation view at the mounting hole of special catalytic distillation structured packing tower tray in embodiment 1.
Specific embodiment
Technical solution of the present invention is described in detail below by attached drawing, but protection scope of the present invention is not limited to
The embodiment.
Embodiment 1: a kind of catalytic distillation structured packing modular mounting arrangement, including tower body, packing support circle and catalysis
Rectifying structured packing tower tray 1, the packing support circle are mounted in the tower body, and the catalytic distillation structured packing tower tray 1 is pacified
On the packing support circle, the catalytic distillation structured packing tower tray 1 includes several parallel zones, several parallel zones
Domain is divided into single module installation region 2 and multimode installation region 3, and the single module installation region 2 is that the catalytic distillation is regular
The parallel zone at 1 both ends of filler tower tray, parallel zone of the multimode installation region 3 between the single module installation region 2
Domain；The single module installation region 1 and multimode installation region 3 are made of the installation of filler module, the single module installation region 2
It is made of the installation of single filler module；Each multimode installation region is made of 2 filler module installations；The single module installation
Region and multimode installation region identify unique radio frequency encoding.
The filler module is made of the installation of several modular units, and the modular unit is by the catalyst module alternately placed
6 and fenestration packing sheet 7 constitute, modular unit includes two kinds in the present embodiment, respectively by 3 layers of+2 layers of fenestration packing sheet catalysis
The assembling mode of+1 layer of catalyst module of the assembling mode of agent module and 2 layers of fenestration packing sheet, both modular units are arranged
Column are assembled into filler module, follow the principle being symmetrically installed in the process, i.e., the structure of repetitive unit in the described filler module
For+3 layers of+1 layer of fenestration packing sheet+2 layers of catalyst module fenestration+2 layers of fenestration packing sheet of packing sheet of 2 layers of catalyst module
The structure type of+1 layer of catalyst module+2 layers of catalyst module of+3 layers of fenestration packing sheet；The catalyst module includes catalysis
Agent and module packet, the module packet are welded by fenestration packing sheet with silk screen, and the catalyst is filled in the module packet
It is interior.
The present apparatus further includes special catalytic distillation structured packing tower tray 4, and the special catalytic distillation structured packing tower tray 4 wraps
The catalytic distillation structured packing tower tray and detection device of setting mounting hole 5 are included, the detection device is installed in the mounting hole,
Detection device in the present apparatus is thermometer or pressure gauge.
To 6 parallel zones of circular mounting region division in the present embodiment, both ends are single module installation region, 4 intermediate
Parallel zone is multimode installation region, and each parallel zone in multimode installation region is divided into 2 subregions；It is divided into
For 10 subregions, and number consecutively 01,02,03,04,05,06,07,08,09 and 10, radio frequency is utilized in each subregion
Identification coding location and installation filler module, in multimode installation region by since one end to the erection sequence that the other end terminates
Filler module is installed.
A kind of new catalytic rectifying structured packing modularization installation method, comprising the following steps:
(1) module divides: according to the requirement of mounting process, in a pre-installation by circular mounting region division at several subregions
Domain, and radio frequency encoding is identified in each subregion；
(2) prepared by module: fenestration packing sheet and silk screen being welded into module packet, the catalyst filling and again into module packet
Secondary suture forms catalyst module；The catalyst module and fenestration packing sheet are assembled into module list by said combination mode
Member；The modular unit is arranged successively, filler module is obtained；
(3) module is installed: it is encoded using radio frequency identification, filler module is installed by the zone location divided in step (1),
Obtain catalytic distillation structured packing tower tray；Mounting hole is set on catalytic distillation structured packing tower tray, inspection is installed in mounting hole
Measurement equipment obtains special catalytic distillation structured packing tower tray；Packing support circle is installed in catalytic rectifying tower, then according to technique
It needs for catalytic distillation structured packing tower tray and special catalytic distillation structured packing tower tray to be mounted on the packing support circle, so
Filler pressing and distributor are fixed afterwards, complete module installation；During the installation process the catalytic distillation structured packing tower tray press by
Under installed to upper sequence；For the contact area for improving material and catalyst, catalytic efficiency is improved, upper layer catalytic distillation is regular to be filled out
Material tower tray is rotated by 90 ° in the same direction relative to lower catalyst rectifying structured packing tower tray, and the surface of the packing support circle is not
Pingdu≤D/500, the D are tower internal diameter.
(4) modular debugging is run: after being installed, first air tightness test is carried out to catalytic rectifying tower, then with reagent pair
Catalytic rectifying tower is cleaned, and the moisture in filler and catalyst is taken away, and avoids water knot in the too low rear filler of temperature and catalyst
Ice causes catalyst breakage.
Embodiment 2: the apparatus structure in the present embodiment is in the same manner as in Example 1 with installation method, and difference is this reality
It applies to 10 parallel zones of circular mounting region division in example, both ends are single module installation region, and intermediate 8 parallel zones are
Multimode installation region, each parallel zone in multimode installation region are divided into 6 subregions, are divided into 50 subregions
Domain, and number consecutively encode location and installation filler module using radio frequency identification in each subregion, in multimode installation region
It is interior that filler module is installed to the erection sequence that the other end terminates by since one end；Upper layer catalytic distillation structured packing tower tray is opposite
60 ° are rotated in the same direction in lower catalyst rectifying structured packing tower tray；
Modular unit presses+2 layers of catalyst module of 3 layers of fenestration packing sheet, 5 layers of fenestration packing sheet respectively in the present embodiment
The assembling mode assembling of+1 layer of+1 layer of catalyst module, 10 layers of fenestration packing sheet catalyst module；It is repeated in filler module single
The structure of member is that 3 layers of+2 layers of fenestration packing sheet+5 layers of catalyst module fenestration+10 layers of catalyst module of+1 layer of packing sheet are opened
The windowing of+1 layer of window packing sheet+1 layer of catalyst module+10 layers of catalyst module+5 layers of catalyst module of+1 layer of fenestration packing sheet
+ 2 layers of formula packing sheet+3 layers of catalyst module fenestration packing sheet.
Embodiment 3: the apparatus structure in the present embodiment is in the same manner as in Example 1 with installation method, and difference is this reality
Applying in example is 3 parallel zones to circular mounting region division, and both ends are single module installation region, and intermediate parallel zone is more
Intermediate parallel zone is divided into 2 subregions, 4 subregions, and number consecutively is divided into, every by module mounting area
In a subregion using radio frequency identification encode location and installation filler module, in multimode installation region by since one end to another
The erection sequence that one end terminates installs filler module；Upper layer catalytic distillation structured packing tower tray is regular relative to lower catalyst rectifying
Filler tower tray rotates 15 ° in the same direction；
Modular unit presses+3 layers of catalyst module of 2 layers of fenestration packing sheet, 1 layer of fenestration packing sheet respectively in the present embodiment
The assembling mode assembling of+5 layers of+10 layers of catalyst module, 1 layer of fenestration packing sheet catalyst module；It is repeated in filler module single
The structure of member is that 2 layers of+3 layers of fenestration packing sheet+1 layer of catalyst module fenestration+1 layer of catalyst module of+10 layers of packing sheet are opened
The windowing of+5 layers of window packing sheet+5 layers of catalyst module+1 layer of catalyst module+1 layer of catalyst module of+10 layers of fenestration packing sheet
+ 3 layers of formula packing sheet+2 layers of catalyst module fenestration packing sheet.
As described above, must not be explained although the present invention has been indicated and described referring to specific preferred embodiment
For the limitation to invention itself.It without prejudice to the spirit and scope of the invention as defined in the appended claims, can be right
Various changes can be made in the form and details for it.
Claims (7)
1. a kind of catalytic distillation structured packing modular mounting arrangement, including tower body, packing support circle, catalytic distillation structured packing
Tower tray and special catalytic distillation structured packing tower tray, the packing support circle are mounted in the tower body, the catalytic distillation rule
Whole filler tower tray is mounted on the packing support circle, it is characterised in that: the catalytic distillation structured packing tower tray includes several
Parallel zone, several parallel zones are divided into single module installation region and multimode installation region, the single module installing zone
Domain and multimode installation region are made of the installation of filler module；The special catalytic distillation structured packing tower tray includes setting installation
The catalytic distillation structured packing tower tray and detection device in hole, the detection device installation is in the mounting hole；
The filler module is made of several modular units, and the modular unit is by the catalyst module and fenestration alternately placed
Packing sheet is constituted, and the catalyst module includes catalyst and module packet, and the module packet is welded by fenestration packing sheet and silk screen
It connects, the catalyst is filled in the module packet；
The single module installation region is the parallel zone at the catalytic distillation structured packing tower tray both ends, the multimode installation
Parallel zone of the region between the single module installation region；
The single module installation region and multimode installation region identify unique radio frequency encoding.
2. catalytic distillation structured packing modular mounting arrangement according to claim 1, it is characterised in that: the single module
Installation region is made of the installation of single filler module；The multimode installation region is made of 2 ~ 50 filler module installations.
3. catalytic distillation structured packing modular mounting arrangement according to claim 1, it is characterised in that: the module list
The combination of fenestration packing sheet and catalyst module is that 1 ~ 10 layer of fenestration packing sheet adds 1 ~ 10 layer of catalyst module in member.
4. a kind of installation method of any one of claim 1 ~ 3 described device, it is characterised in that the following steps are included:
(1) module divides: according to the requirement of mounting process, in a pre-installation by circular mounting region division at several subregions,
And radio frequency encoding is identified in each subregion；
(2) prepared by module: fenestration packing sheet and silk screen being welded into module packet, catalyst filling and stitched again into module packet
It closes, forms catalyst module；The catalyst module and fenestration packing sheet is die-filling by the combination group of 1 ~ 10 plus 1 ~ 10
Module unit；The modular unit is arranged successively, filler module is obtained；
(3) module is installed: being encoded using radio frequency identification, filler module is installed by the zone location divided in step (1), is obtained
Catalytic distillation structured packing tower tray；Mounting hole is set on catalytic distillation structured packing tower tray, installation detection is set in mounting hole
It is standby, obtain special catalytic distillation structured packing tower tray；Packing support circle is installed in catalytic rectifying tower, then according to process requirement
Catalytic distillation structured packing tower tray and special catalytic distillation structured packing tower tray are mounted on the packing support circle, it is then solid
Determine filler pressing and distributor, completes module installation；
(4) modular debugging is run: after being installed, first air tightness test is carried out to catalytic rectifying tower, then with reagent to catalysis
Rectifying column is cleaned, and the moisture in filler and catalyst is taken away.
5. installation method according to claim 4, it is characterised in that: the catalytic distillation structured packing during the installation process
Tower tray is by sequence installation from bottom to top, and upper layer catalytic distillation structured packing tower tray is relative to lower catalyst rectifying structured packing
Tower tray rotates 1 ~ 90 ° in the same direction.
6. installation method according to claim 4, it is characterised in that: upper layer catalytic distillation structured packing tower tray is relative under
Layer catalytic distillation structured packing tower tray is rotated by 90 ° in the same direction.
7. installation method according to claim 4, it is characterised in that: surface irregularity≤D/ of the packing support circle
500, the D are tower internal diameter.
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| CN201610060898.0A CN105498266B (en) | 2016-01-28 | 2016-01-28 | A kind of catalytic distillation structured packing modularization installation method and device |
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| CN201610060898.0A CN105498266B (en) | 2016-01-28 | 2016-01-28 | A kind of catalytic distillation structured packing modularization installation method and device |
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| CN105498266B true CN105498266B (en) | 2019-01-01 |
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| CN105836708A (en) * | 2016-06-15 | 2016-08-10 | 中建安装工程有限公司 | Device and method for separating and purifying HCl by utilizing novel structured packing |
| CN111841057A (en) * | 2020-08-18 | 2020-10-30 | 丹东明珠特种树脂有限公司 | Catalytic distillation tower with modular catalyst filling modification |
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| CN102824890B (en) * | 2012-09-18 | 2014-10-22 | 天津大学 | Catalytic distillation filler with alternative flow structure |
| CN104587908B (en) * | 2015-01-24 | 2016-09-07 | 福州大学 | A kind of Catalyst packing structure being applicable to big tower diameter catalytic rectifying tower and application thereof |
| CN205340190U (en) * | 2016-01-28 | 2016-06-29 | 中建安装工程有限公司 | Novel installation of catalysis rectification regular packing modularization device |
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Address after: 210046 Yaojia Road, Qixia District, Nanjing, Jiangsu Province Patentee after: China Construction Installation Group Co., Ltd. Address before: 210046 Yaojia Road, Qixia District, Nanjing, Jiangsu Province Patentee before: China Construction Industrial Equipment Installation Co., Ltd. |
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