CN108355367A - Naphthalene vaporising device in phthalic anhydride preparation process - Google Patents
Naphthalene vaporising device in phthalic anhydride preparation process Download PDFInfo
- Publication number
- CN108355367A CN108355367A CN201810474906.5A CN201810474906A CN108355367A CN 108355367 A CN108355367 A CN 108355367A CN 201810474906 A CN201810474906 A CN 201810474906A CN 108355367 A CN108355367 A CN 108355367A
- Authority
- CN
- China
- Prior art keywords
- naphthalene
- cylinder
- steam
- reboiler
- phthalic anhydride
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 title claims abstract description 263
- LGRFSURHDFAFJT-UHFFFAOYSA-N Phthalic anhydride Natural products C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-UHFFFAOYSA-N 0.000 title claims abstract description 26
- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical compound CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 34
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 23
- 239000010959 steel Substances 0.000 claims abstract description 23
- 239000000470 constituent Substances 0.000 claims abstract description 20
- 241000628997 Flos Species 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims description 7
- 230000014759 maintenance of location Effects 0.000 claims description 7
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 claims description 4
- BGOFCVIGEYGEOF-UJPOAAIJSA-N helicin Chemical compound O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@H]1OC1=CC=CC=C1C=O BGOFCVIGEYGEOF-UJPOAAIJSA-N 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 7
- 239000012535 impurity Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 2
- 230000002779 inactivation Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000006200 vaporizer Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 125000001624 naphthyl group Chemical group 0.000 description 1
- 238000011176 pooling Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
- B01D1/305—Demister (vapour-liquid separation)
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The present invention relates to naphthalene vaporising devices in phthalic anhydride preparation process, including naphthalene evaporator, including upper cover, cylinder and low head, the lower part of the cylinder is connected to the lower part of naphthalene reboiler by pipeline, the top of the naphthalene reboiler is connected to the middle and upper part of cylinder, the bottom of naphthalene reboiler is equipped with heavy constituent floss hole, and naphthalene reboiler is passed through high steam to liquid naphthalene indirectly heat；The low head bottom is equipped with heavy constituent floss hole, uniformly distributed angle steel outside the cylinder, the angle steel upper end is connected with around the steam inlet channel of cylinder, angle steel lower end is connected with the steam outlet passage around cylinder, closed steam channel is formed between the steam inlet channel, steam outlet passage, angle steel and cylinder, demister is arranged in cylinder internal upper part；The present invention increases naphthalene reboiler and is used together with naphthalene evaporator, is heated to liquid naphthalene, improves the output of naphthalene, and liquid naphthalene is made to be fully converted into gas naphthalene, good separating effect, and production run is stablized.
Description
Technical field
The present invention relates to chemical equipment technical fields, and in particular to naphthalene vaporising device in phthalic anhydride preparation process.
Background technology
Impurity phase is to more in crude naphthalene, and in the production of naphthalene legal system phthalic anhydride, naphthalene vapo(u)rization system is essential, effect
Have at 2 points：（1）Ensure the gasification result of crude naphthalene, realize that high-temperature liquid naphthalene completely vaporizes into gas naphthalene, remove the drop in devaporation,
It after gas naphthalene enters vaporizer, mixes with air, is reacted into oxidator.（2）Crude naphthalene impurity is more, and high steam is to liquid naphthalene
It is heated, its heavy constituent is made not enter reactor, avoid that temperature is excessively high and catalyst inactivation.In order not to cause the above situation
Occur, naphthalene vapour system will realize the functions such as the separation of crude naphthalene heavy constituent and light component in phthalic anhydride production.
Naphthalene vapo(u)rization system is single naphthalene evaporator in the prior art, in normal production, the heavy constituent in crude naphthalene
Base of evaporator is accumulated in for a long time, occurs that poor evaporation effect, naphthalene pipeline blockage, yield are unstable etc. to influence factor of production.
Invention content
The object of the present invention is to provide a kind of good separating effect, naphthalene vaporising device in phthalic anhydride preparation process easy to operate.
To achieve the above object, the technical solution adopted by the present invention is：
Naphthalene vaporising device in phthalic anhydride preparation process, including naphthalene evaporator, the naphthalene evaporator include upper cover, cylinder and lower envelope
Head, the lower part of the cylinder are connected to the lower part of naphthalene reboiler by pipeline, and the top of the naphthalene reboiler is connected to cylinder
The bottom of middle and upper part, naphthalene reboiler is equipped with heavy constituent floss hole, and naphthalene reboiler is passed through high steam to liquid naphthalene indirectly heat；It is described
It is equipped with naphthalene steam (vapor) outlet at the top of upper cover, the low head bottom is equipped with heavy constituent floss hole, uniformly distributed angle outside the cylinder
Steel, the angle steel upper end are connected with around the steam inlet channel of cylinder, and angle steel lower end is connected with the steam (vapor) outlet around cylinder
Channel forms closed steam channel, the lower envelope between the steam inlet channel, steam outlet passage, angle steel and cylinder
Demister is arranged in the spiral helicine steam-heating pipe of setting in head, cylinder internal upper part.
Further, setting first pressure gauge and the first thermometer at the top of naphthalene evaporator, the middle part setting of naphthalene evaporator the
Third thermometer and second liquid level gauge is arranged in two pressure gauges, second temperature meter and first liquid level gauge, naphthalene base of evaporator.
Further, insulating layer is set on the outside of the angle steel.
Further, it is equipped with hemispherical retention plate in cylinder, retains uniformly distributed through-hole on plate.
Further, the demister includes the silk screen layer of first the filter plate layer and upper layer of lower layer, and the just filter plate layer is in half
Spherical shape, the channel of uniformly distributed serpentine on first filter plate layer.
Further, steam heat exchanging tube is equipped in the cylinder, the steam heat exchanging tube includes steam inlet tube, heat exchange ring
The opposite end of pipe and steam outlet pipe, the heat exchange endless tube is respectively connected to steam inlet tube and steam outlet pipe, the heat exchange
Endless tube includes the pipeline of a plurality of connection steam inlet tube and steam outlet pipe.
Further, the heat exchange endless tube is obliquely installed, and angle of inclination is horizontal by 5~15 °.
Beneficial effects of the present invention are：Naphthalene vaporising device in the phthalic anhydride preparation process of the present invention increases naphthalene reboiler, with naphthalene
Evaporator is used together, and is heated to liquid naphthalene, improves the output of naphthalene, and production efficiency is high, and liquid naphthalene is made to convert completely
At gas naphthalene, it is ensured that non-entrained liquids naphthalene in gas naphthalene, good separating effect, production run are stablized, and operation is simple；Naphthalene boils again
Device is respectively provided with heavy constituent floss hole with naphthalene base of evaporator, periodically discharges, heavy constituent is detached in time with light component, improves production
Efficiency；Uniformly distributed angle steel outside the cylinder, increases the intensity of cylinder, and steam inlet channel, steam outlet passage, angle steel and
Closed steam channel is formed between cylinder, achievees the effect that heat cylinder or kept the temperature；Spiral is set in low head
The steam-heating pipe of shape can heat the heavy constituent pooling zone of bottom, make possible remaining light component volatilization in heavy constituent, add
Strong separating effect；It is equipped with hemispherical retention plate in cylinder, is placed in liquid naphthalene liquid level, it can be to being carried secretly in the gas naphthalene of volatilization
Liquid naphthalene do preliminary filtering；Demister can intercept the liquid naphthalene of gas naphthalene entrainment, ensure non-entrained liquids naphthalene in gas naphthalene,
Wherein, first filter plate layer is hemispherical, the channel of uniformly distributed serpentine on first filter plate layer, ensures removal liquid naphthalene, makes the liquid naphthalene of retention
Cylinder inboard wall is flowed to, silk screen layer plays the role of further removing liquid naphthalene；The steam heat exchanging tube being arranged in cylinder, can make liquid
The heating of naphthalene is more uniform, and heat exchange endless tube, which is obliquely installed, can be discharged steam heat exchanging tube when ensure that steam liquefied.
Description of the drawings
Fig. 1 is the structural schematic diagram of naphthalene vaporising device in phthalic anhydride preparation process of the present invention.
Fig. 2 is the internal structure schematic diagram of naphthalene vaporising device in phthalic anhydride preparation process of the present invention.
Fig. 3 is that the structure of the insulating layer of naphthalene vaporising device, steam-heating pipe and angle steel in phthalic anhydride preparation process of the present invention is shown
It is intended to.
Fig. 4 is the structural schematic diagram of the heat exchange endless tube of naphthalene vaporising device in phthalic anhydride preparation process of the present invention.
Attached figure label is：1 it is naphthalene evaporator, 2 be upper cover, 3 be cylinder, 4 be low head, 5 be naphthalene reboiler, 6 is
Naphthalene steam (vapor) outlet, 7 be angle steel, 8 be steam inlet channel, 9 be steam outlet passage, 10 be steam-heating pipe, 11 be demister,
12 it is insulating layer, 13 is retention plate, 14 is steam heat exchanging tube, 15 is first pressure gauge, 16 is the first thermometer, 17 is the second pressure
Power table, 18 be second temperature meter, 19 be first liquid level gauge, 20 be third thermometer, 21 be second liquid level gauge, 111 be just filter plate
Layer, 112 be silk screen layer, 141 be steam inlet tube, 142 be exchange heat endless tube, 143 be steam outlet pipe.
Specific implementation mode
Present invention will be further explained below with reference to the attached drawings and specific embodiments：
Embodiment 1
As shown in Figures 1 to 4, naphthalene vaporising device in phthalic anhydride preparation process, including naphthalene evaporator 1, the naphthalene evaporator 1 include upper
End socket 2, cylinder 3 and low head 4, the lower part of the cylinder 3 are connected to the lower part of naphthalene reboiler 5 by pipeline, and the naphthalene boils again
The top of device 5 is connected to the middle and upper part of cylinder 3, and the bottom of naphthalene reboiler 5 is equipped with heavy constituent floss hole, and naphthalene reboiler 5 is passed through height
Press steam to liquid naphthalene indirectly heat；2 top of the upper cover is equipped with naphthalene steam (vapor) outlet 6, and 4 bottom of the low head is equipped with heavy constituent
Floss hole, uniformly distributed angle steel 7,7 upper end of the angle steel are connected with around the steam inlet channel 8 of cylinder 3 cylinder 3 outside,
7 lower end of angle steel is connected with the steam outlet passage 9 around cylinder 3, the steam inlet channel 8, steam outlet passage 9, angle steel 7
Form closed steam channel between cylinder 3, the spiral helicine steam-heating pipe 10 of setting in the low head 4, in cylinder 3 on
Demister 11 is arranged in portion.1 top setting first pressure gauge 15 of naphthalene evaporator and the first thermometer 16, the middle part of naphthalene evaporator 1 are set
Second pressure gauge 17, second temperature meter 18 and first liquid level gauge 19 are set, third thermometer 20 and second is arranged in 1 bottom of naphthalene evaporator
Liquid level gauge 21.
Embodiment 2
As shown in Figures 1 to 4, with embodiment 1, the difference is that：Insulating layer 12 is arranged in 7 outside of the angle steel；It is set in cylinder 3
There are hemispherical retention plate 13, retention plate 13 to be set to liquid naphthalene ullage position, retain uniformly distributed through-hole on plate 13；Institute
The silk screen layer 112 that demister 11 includes the first filter plate layer 111 and upper layer of lower layer is stated, the just filter plate layer 111 is hemispherical, initial filter
The channel of uniformly distributed serpentine on plate layer 111；Steam heat exchanging tube 14 is equipped in the cylinder 3, the steam heat exchanging tube 14 includes
The opposite end of steam inlet tube 141, heat exchange endless tube 142 and steam outlet pipe 143, the heat exchange endless tube 142 is respectively connected to steam
Vapour inlet tube 141 and steam outlet pipe 143, the heat exchange endless tube 142 include a plurality of connection steam inlet tube 141 and steam (vapor) outlet
The pipeline of pipe 143；The heat exchange endless tube 142 is obliquely installed, and angle of inclination is horizontal by 5~15 °.
Operation principle and step：
Impurity is more in crude naphthalene, and heavy constituent is more, this recombination is divided into the invalid component in the production of naphthalene legal system phthalic anhydride, and easily causes pipeline
Block, hot spot is excessively high, catalyst inactivation, system resistance are big, influence being normally carried out for production.Meanwhile naphthalene legal system phthalic anhydride needs
Raw material is that gas naphthalene produces phthalic anhydride with air hybrid reaction, it is therefore desirable to eliminate heavy constituent, improve the content of gas naphthalene.Pass through tune
Save in phthalic anhydride preparation process the flow of the high steam of naphthalene reboiler 5 in naphthalene vaporising device, naphthalene vaporising device gas naphthalene pressure,
The temperature of temperature and liquid naphthalene, using the difference of component boiling point, realization gas naphthalene is efficiently separated with other heavy constituents.
Liquid naphthalene after preheating respectively enters in naphthalene evaporator 1 and naphthalene reboiler 5, is adjusted into the steaming of 5 mesohigh of naphthalene reboiler
The throttle flow of vapour controls pressure, the temperature of temperature and liquid naphthalene of gas naphthalene in naphthalene evaporator 1, liquid naphthalene is made to be fully converted into
Gas naphthalene.Since crude naphthalene impurity is more, heavy constituent is more, and by the gas-liquid separation of naphthalene vaporising device, light component completely vaporizes into gas
Body naphthalene realizes next link into phthalic anhydride preparation process, i.e., feeds in vaporizer, mixed with air.Heavy constituent, that is, naphthalene slag accumulation
In the bottom of naphthalene evaporator 1 and naphthalene reboiler 5, certain interval of time discharge naphthalene slag in naphthalene slag ladle.
The embodiment of the above, only presently preferred embodiments of the present invention, not limits the scope of the present invention, therefore
It is all according to the equivalent change or modification that technical solution is done described in the scope of the claims of the present invention, the present patent application patent model should all be included in
In enclosing.
Claims (7)
1. naphthalene vaporising device in phthalic anhydride preparation process, including naphthalene evaporator, which is characterized in that the naphthalene evaporator includes upper envelope
Head, cylinder and low head, the lower part of the cylinder are connected to the lower part of naphthalene reboiler, the top of the naphthalene reboiler by pipeline
It is connected to the middle and upper part of cylinder, the bottom of naphthalene reboiler is equipped with heavy constituent floss hole, and naphthalene reboiler is passed through high steam to liquid naphthalene
Indirectly heat；Naphthalene steam (vapor) outlet is equipped at the top of the upper cover, the low head bottom is equipped with heavy constituent floss hole, the cylinder
Outer uniformly distributed angle steel, the angle steel upper end are connected with around the steam inlet channel of cylinder, and angle steel lower end is connected with around cylinder
It is logical to form closed steam for the steam outlet passage of body between the steam inlet channel, steam outlet passage, angle steel and cylinder
Demister is arranged in road, the interior spiral helicine steam-heating pipe of setting of the low head, cylinder internal upper part.
2. naphthalene vaporising device in phthalic anhydride preparation process according to claim 1, which is characterized in that setting at the top of naphthalene evaporator
First pressure gauge and the first thermometer, middle part setting second pressure gauge, second temperature meter and the first liquid level gauge of naphthalene evaporator, naphthalene
Third thermometer and second liquid level gauge is arranged in base of evaporator.
3. naphthalene vaporising device in phthalic anhydride preparation process according to claim 1, which is characterized in that setting on the outside of the angle steel
Insulating layer.
4. naphthalene vaporising device in phthalic anhydride preparation process according to claim 1, which is characterized in that it is in hemisphere to be equipped in cylinder
The retention plate of shape retains uniformly distributed through-hole on plate.
5. naphthalene vaporising device in phthalic anhydride preparation process according to claim 1, which is characterized in that under the demister includes
The silk screen layer of first the filter plate layer and upper layer of layer, the just filter plate layer is hemispherical, and uniformly distributed serpentine is logical on first filter plate layer
Road.
6. naphthalene vaporising device in phthalic anhydride preparation process according to claim 1, which is characterized in that be equipped with and steam in the cylinder
Vapour heat exchanger tube, the steam heat exchanging tube include steam inlet tube, heat exchange endless tube and steam outlet pipe, the opposite of endless tube that exchange heat
Both ends are respectively connected to steam inlet tube and steam outlet pipe, and the heat exchange endless tube includes a plurality of connection steam inlet tube and steam
The pipeline of outlet.
7. naphthalene vaporising device in phthalic anhydride preparation process according to claim 6, which is characterized in that the heat exchange endless tube tilts
Setting, angle of inclination are horizontal by 5~15 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810474906.5A CN108355367B (en) | 2018-05-17 | 2018-05-17 | Naphthalene evaporation device in phthalic anhydride preparation process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810474906.5A CN108355367B (en) | 2018-05-17 | 2018-05-17 | Naphthalene evaporation device in phthalic anhydride preparation process |
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| Publication Number | Publication Date |
|---|---|
| CN108355367A true CN108355367A (en) | 2018-08-03 |
| CN108355367B CN108355367B (en) | 2024-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810474906.5A Active CN108355367B (en) | 2018-05-17 | 2018-05-17 | Naphthalene evaporation device in phthalic anhydride preparation process |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113926213A (en) * | 2021-10-19 | 2022-01-14 | 泰兴协联众达化学有限公司 | Naphthalene evaporation device in phthalic anhydride preparation process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB841885A (en) * | 1955-12-24 | 1960-07-20 | Ernst Paul Jager | Improvements in and relating to evaporation apparatus |
| SU1558793A1 (en) * | 1988-07-18 | 1990-04-23 | Производственное Объединение "Ждановтяжмаш" | Railway tank for shipping setting-prone liquids |
| SU1751606A1 (en) * | 1989-12-06 | 1992-07-30 | Научно-Производственное Объединение "Техэнергохимпром" | Slotted radiation recuperator |
| CN103032860A (en) * | 2012-12-25 | 2013-04-10 | 上海建安化工设计有限公司 | Naphthalene vaporizer |
| CN203478163U (en) * | 2013-08-28 | 2014-03-12 | 上海建安化工设计有限公司 | Naphthalene vaporizer with demister |
| CN104259428A (en) * | 2014-09-16 | 2015-01-07 | 苏州橙石铸造有限公司 | Heating system for die-casting machine injection device |
| CN105289441A (en) * | 2015-12-03 | 2016-02-03 | 广西大学 | Double-layered spiral channel jacket layer |
| CN206540167U (en) * | 2017-03-06 | 2017-10-03 | 杭州中策清泉实业有限公司 | It is a kind of to reduce the lost air preheater of heat |
| CN206604214U (en) * | 2017-03-14 | 2017-11-03 | 枣庄杰富意振兴化工有限公司 | A kind of naphthalene evaporator |
| CN208320017U (en) * | 2018-05-17 | 2019-01-04 | 河南庆安化工高科技股份有限公司 | Naphthalene vaporising device in a kind of phthalic anhydride preparation process |
-
2018
- 2018-05-17 CN CN201810474906.5A patent/CN108355367B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB841885A (en) * | 1955-12-24 | 1960-07-20 | Ernst Paul Jager | Improvements in and relating to evaporation apparatus |
| SU1558793A1 (en) * | 1988-07-18 | 1990-04-23 | Производственное Объединение "Ждановтяжмаш" | Railway tank for shipping setting-prone liquids |
| SU1751606A1 (en) * | 1989-12-06 | 1992-07-30 | Научно-Производственное Объединение "Техэнергохимпром" | Slotted radiation recuperator |
| CN103032860A (en) * | 2012-12-25 | 2013-04-10 | 上海建安化工设计有限公司 | Naphthalene vaporizer |
| CN203478163U (en) * | 2013-08-28 | 2014-03-12 | 上海建安化工设计有限公司 | Naphthalene vaporizer with demister |
| CN104259428A (en) * | 2014-09-16 | 2015-01-07 | 苏州橙石铸造有限公司 | Heating system for die-casting machine injection device |
| CN105289441A (en) * | 2015-12-03 | 2016-02-03 | 广西大学 | Double-layered spiral channel jacket layer |
| CN206540167U (en) * | 2017-03-06 | 2017-10-03 | 杭州中策清泉实业有限公司 | It is a kind of to reduce the lost air preheater of heat |
| CN206604214U (en) * | 2017-03-14 | 2017-11-03 | 枣庄杰富意振兴化工有限公司 | A kind of naphthalene evaporator |
| CN208320017U (en) * | 2018-05-17 | 2019-01-04 | 河南庆安化工高科技股份有限公司 | Naphthalene vaporising device in a kind of phthalic anhydride preparation process |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113926213A (en) * | 2021-10-19 | 2022-01-14 | 泰兴协联众达化学有限公司 | Naphthalene evaporation device in phthalic anhydride preparation process |
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| CN108355367B (en) | 2024-06-28 |
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