CN102538426A - Continuous drying process and equipment for cyclohexanone oximation catalyst - Google Patents
Continuous drying process and equipment for cyclohexanone oximation catalyst Download PDFInfo
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- CN102538426A CN102538426A CN2012100495077A CN201210049507A CN102538426A CN 102538426 A CN102538426 A CN 102538426A CN 2012100495077 A CN2012100495077 A CN 2012100495077A CN 201210049507 A CN201210049507 A CN 201210049507A CN 102538426 A CN102538426 A CN 102538426A
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Abstract
The invention provides a continuous drying process and equipment for a cyclohexanone oximation catalyst, which solve the material viscosity problem and realize the process course of continuous and clean drying of a slurry liquid material. The invention provides matching equipment of the drying process at the same time. The process course comprises the following steps of: adding catalyst slurry from a material inlet of a primary blade dryer through a feed pump; heating, drying and solidifying the slurry material in the process of conveying to a material outlet of the dryer, and then entering a secondary blade dryer; and continuously heating the material in the secondary blade dryer, and drying until reaching the water content required by the process to obtain a catalyst product, wherein dust impurities of a carrier gas are filtered via an air filter, the carrier gas is heated via an air heater and mixed with water vapor which is evaporated from the primary and secondary blade dryers, then a mixture is introduced to a dust catcher so as to catch catalyst dusts carried by the evaporated water vapor in the drying process, and the dedusted and purified mixed gas is discharged via a draught fan.
Description
Technical field
The invention belongs to the dry field of cyclohexanone oximate catalyst in the caprolactam production process, relate to the process of a kind of continuous drying, cleaning, highly effective drying, and corresponding complete set of equipments.
Background technology
The cyclohexanone amidoximeization is the important step of producing caprolactam.Nineteen forty-three, our company is sent out through cyclohexanone-azanol synthetic (abbreviating the oxime method now as) by Germany, has at first realized the caprolactam commercial production.Along with the development of synthetic fiber industry, the caprolactam requirement increases year by year, and becomes important chemical material, and of many uses.At present; Large-scale caprolactam production line of China such as Ba Ling branch company of China Petrochemical Industry 140,000 t/a caprolactam production lines; 160,000 t/a production lines etc. after Shijiazhuang chemical fibre Co., Ltd of the China Petrochemical Industry enlargement of scale; The drying process of its cyclohexanone amidoxime catalyst adopts all be traditional in batches, be interrupted drying process, and in a rake formula drying equipment, accomplish dry run.
With 10m3, the catalyst raw material of moisture content 85% is an example, and thermal source adopts 0.5MPaG, and 165 ℃ of steam require product moisture content < 4%.Existing drying process adopts rake type drier dry in batches.Single crowd of dried material 1m3, need 40 hours drying time approximately, 0.5 hour single discharge time.Need 45 hours arid cycle approximately, steam consumption 24600kg.This drying process exists disposal ability little, and arid cycle is long, and labour intensity is big, problems such as site environment difference.
Summary of the invention
What the present invention proposed is the technology of cyclohexanone amidoxime catalyst continuous drying.Solved the material problem of viscosity, realized that the pulpous state liquid material is continuous, the technical process of clean dry.
Another object of the present invention provides the corollary equipment of above-mentioned drying process, and this equipment adopts optimum organization, can realize continuous drying, has improved production efficiency.
The objective of the invention is to realize through following measure:
Cyclohexanone amidoxime catalyst continuous drying technology of the present invention, detailed process is following:
Catalyst slurry is added from one-level blade dryer material inlet by feed pump; Serum materials is after drying machine material outlet in service is heated dry solidification; Get into second level blade dryer; Material continues to be heated, to be dried to the water content of technological requirement in the secondary blade dryer, obtains catalyst prod;
Wherein carrier gas is filtered dust impurity wherein through air cleaner; Heat through the finned tube air heater; Again with mix from I and II blade dryer vapor evaporated after, feed sack cleaner and capture the catalyst dust that evaporation steam is carried secretly in the dry run; Mist after the udst separation is via air-introduced machine emptying.
Sack cleaner adopts hot blowback air deashing, can effectively avoid purge gas to get into deduster, makes carrier gas produce the possibility of dewfall.After purge gas adopts compressed air, compressed air to be compressed the air heater heating, through the pulse magnetic valve regularly to the sack cleaner deashing.
Further design of the present invention is that deduster adopts sack cleaner; The filter bag of sack cleaner adopts coated filter material; The housing of sack cleaner is provided with companion's heat structure.
Further design of the present invention is that also said air heater adopts the finned tube air heater.
Cyclohexanone amidoxime catalyst continuous drying equipment of the present invention comprises a feed pump, air cleaner and air heater, deduster and drying machine, and it is characterized in that: said drying machine adopts two blade dryers, is divided into secondary drying; The catalyst feed pipeline connects feed pump successively, one-level blade dryer, secondary blade dryer;
Carrier gas channel connects air cleaner successively, air heater shell side, one-level blade dryer gas vent, secondary blade dryer gas vent, sack cleaner, blower fan;
The heating steam pipeline connects the air heater tube side respectively, one-level blade dryer paddle shaft and chuck, secondary blade dryer paddle shaft and chuck, compressed air heater tube side.
The beneficial effect of advantage of the present invention and generation:
1, continuous drying equipment of the present invention satisfies the requirement of cyclohexanone oximate catalyst continuous drying technology.
2, utilize blade dryer not only to realize continuous drying; And the self-cleaning function that himself has viscous material; The exit weir plate structure; Solved in the liquid material dry run wet part of high, mobile strong, technological difficulties such as viscosity change is big, in an equipment, realized evaporation, concentrate, curing, dry overall process.
3, production technology of the present invention is improved to continuous drying with contact drying, has simplified production procedure, has alleviated labour intensity, has improved operating environment, has reduced operating costs such as manual cleaning, cleaning simultaneously.
4, improved production efficiency, shorten drying time significantly.
5, energy consumption is low, pollutes for a short time, easy to operate, and catalyst prod per ton can be saved the steam consumption about 35%.
6, the air cleaner of 100,000 grades of levels is adopted in wet part carrier gas, has guaranteed that dry products is not polluted by airborne dust.
7, sack cleaner effectively captures carrier gas and carries dust secretly, satisfies catalyst recovery efficient.
Description of drawings
Fig. 1 is a cyclohexanone oximate catalyst continuous drying system flow chart.
Among the figure: the 1-feed pump; 2-level blade dryer; 3-drain valve a; 4-drain valve b; 5-secondary blade dryer; The 6-discharge valve; The 7-sack cleaner; 8-drain valve c; The 9-blower fan; 10-compressed air heater; The 11-impulse electromagnetic valve; 12-drain valve d; 13-finned tube air heater; The 14-air cleaner.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is done further description:
As shown in Figure 1, continuous drying equipment of the present invention comprises 1, two blade dryer of a feed pump, 13, one finned tube heaters of an air cleaner 14,7, one compressed air heater of sack cleaner 10, a typhoon machine 9.
What material pipe connected successively is feed pump 1, one-level blade dryer 2, secondary blade dryer 5.
What carrier gas channel connected successively is air cleaner 13, finned tube air heater 14 shell sides, one-level blade dryer 2 gas vents, secondary blade dryer 5 gas vents, sack cleaner 7, blower fan 9.
Heating steam feeds finned tube air heater 14 tube sides respectively, one-level blade dryer 2 paddle shafts and chuck, secondary blade dryer 5 paddle shafts and chuck, compressed air heater 10 tube sides as the heating thermal source.
Capital equipment briefly introduces as follows:
(1) blade dryer
The blade dryer that this complete set of equipments uses is existing device; Mainly form by heat exchanger components such as housing, chuck, paddle shaft etc.; Can be with the catalyst slurry continuous evaporation, concentrate, curing, drying, the equipment main feature comprises: but (a) this equipment continuous effective ground with liquid material through evaporation, concentrate and be converted into solid material, be to simplify cyclohexanone amidoxime catalyst slurry drying process flow process; Guarantee product quality, make things convenient for system's operation opened up one newly by way of.(b) this equipment is two central shafts, synchronous, backwards rotation, and viscous material is had self-cleaning function preferably, can reduce plant maintenance work, the prolongation equipment operation cycle of operation.(c) the equipment center axle is furnished with a large amount of heat exchanger components, and volume of equipment can be fully used.(d) little at normal operating condition, equipment thermal efficiency can guarantee that up to more than 80% more former rake formula drying equipment improves heat utilization efficiency more than one times.(e) the equipment outlet is provided with weir plate, can regulate the residence time of material in the drying machine easily, guarantees the exported product moisture stabilization, and does not receive feed rate and change in concentration.
(2) air cleaner and heater
Air cleaner adopts triple effect to filter, and can make air purity reach 100,000 grades of levels, thereby guarantees that dry products can be by the airborne dust contaminating impurity.Air heater is made up of aluminum finned tube heating element heater and housing, and wherein the finned tube heating element heater can guarantee the air high efficient heat exchanging, reduces the equipment heat exchange area.
(3) sack cleaner
Dusty gas gets into the casing that some filter bags are housed through import, is purified through filter bag gas, and dust is captured by the filter bag outer surface, and purified gas is discharged from deduster top.Regularly send pulse signal by impulse controller, realize the deashing operation.This equipment mainly is made up of housing, filter bag, ash discharging hole, purge gas gas bag, impulse electromagnetic valve, impulse generator and automatic control system etc., and filter bag guarantees efficiency of dust collection, and pulse generation control system and impulse electromagnetic valve guarantee that system normally moves.The equipment main feature comprises that (a) filter bag adopts coated filter material, and efficiency of dust collection can reach more than 99.9%.(b) for preventing carrier gas in deduster wall dewfall, apparatus casing is provided with companion's heat structure.(c) adopt hot blowback air, can effectively avoid purge gas to get into deduster, make carrier gas produce the possibility of dewfall.
Equipment of the present invention adopts the two-stage blade dryer to realize the continuous drying process; It is convenient to drive, stop; Dry products moisture satisfies technological requirement through regulating the time of staying or the temperature of heat medium of material in drying machine; Wet part of carrier gas (air) guarantees that through filter cleaning dry products is not polluted by airborne dust, and sack cleaner captures carrier gas and carries dust secretly, satisfies catalyst recovery efficient.Thereby can realize system equipment long period, stable, reliability service.
Continuous drying technical process of the present invention is following:
Cyclohexanone oximate catalyst slurry is added from one-level blade dryer 2 material inlets by feed pump 1, serum materials in service to the drying machine material outlet, and the moisture in the material is by steam indirect, evaporation and concentration in paddle shaft and the chuck.After material is heated dry solidification, get into second level blade dryer 5, catalyst continues by the Steam Heating in paddle shaft and the chuck, is dried to the moisture of technological requirement in secondary blade dryer 5, is generally less than 4%.The catalyst that comes out from secondary blade dryer 5 goes subsequent handling according to manufacturing technique requirent.
The dust impurity that the carrier gas of this drying system is filtered wherein through air cleaner 14; Through 14 heating of finned tube air heater; Again with mix from I and II blade dryer vapor evaporated after, feed sack cleaner 7 and capture the catalyst dust that evaporation steam is carried secretly in the dry runs.Mist after the udst separation is via air-introduced machine 9 emptying.
The purge gas of sack cleaner 7 adopts compressed air.After compressed air is compressed air heater 10 heating, through pulse magnetic valve 11 regularly to sack cleaner 7 deashings.Steam condensate after the heating steam heat exchange is discharged by drain valve.
Among the present invention; Cyclohexanone oximate catalyst slurry adds from the import of one-level blade dryer is quantitative, stable through feed pump; The material that gets into drying machine passes through the steam indirect, transpiring moisture, and liquid material is realized the transition process to solid material in this equipment; The secondary blade dryer is used to regulate the moisture of dry catalyst, makes it reach the product humidity of technological requirement.Wet part carrier gas adopts air cleaner to purify air, and guarantees to reclaim product and is not polluted by airborne dust; Sack cleaner captures carrier gas and carries dust secretly, satisfies catalyst recovery efficient.
With 10m3, the catalyst raw material of moisture content 85% is an example, and thermal source adopts 0.5MPaG, and 165 ℃ of steam require product moisture content < 4%.Drying process of the present invention adopts secondary blade dryer continuous drying, one-level blade dryer heat exchange area 15 ㎡, and secondary blade dryer heat exchange area 10 ㎡, all drying finishes only needs 24 hours, all steam consumption 16000kg.
Claims (8)
1. cyclohexanone amidoxime catalyst continuous drying technology is characterized in that concrete dry run is:
Catalyst slurry is added from one-level blade dryer (2) material inlet by feed pump (1); Serum materials is after drying machine material outlet in service is heated dry solidification; Get into second level blade dryer (5); Material continues to be heated, to be dried to the water content of technological requirement in secondary blade dryer (5), obtains catalyst prod;
Wherein carrier gas is filtered dust impurity wherein through air cleaner (13), through the air heater heating, again with mixes from I and II blade dryer vapor evaporated after, feed deduster and capture and evaporate the catalyst dust that steam is carried secretly in the dry run; Mist after the udst separation is via air-introduced machine (9) emptying.
2. drying process according to claim 1 is characterized in that: said air heater adopts finned tube air heater (13).
3. drying process according to claim 1 and 2 is characterized in that: said deduster adopts sack cleaner (7).
4. drying process according to claim 3 is characterized in that: sack cleaner (7) adopts hot blowback air deashing.
5. cyclohexanone amidoxime catalyst continuous drying equipment; Comprise a feed pump (1), an air cleaner (13) and air heater (14), deduster and drying machine; It is characterized in that: said drying machine adopts two blade dryers, is divided into secondary drying; The catalyst feed pipeline connects feed pump successively, one-level blade dryer (2), secondary blade dryer (5);
Carrier gas channel connects air cleaner (13) successively, air heater shell side, one-level blade dryer (2) gas vent, secondary blade dryer (5) gas vent, deduster (7), blower fan (9);
The heating steam pipeline connects the air heater tube side respectively, one-level blade dryer paddle shaft and chuck, secondary blade dryer paddle shaft and chuck, compressed air heater (10) tube side.
6. continuous drying equipment according to claim 5 is characterized in that: said deduster adopts sack cleaner (7).
7. continuous drying equipment according to claim 6 is characterized in that: the filter bag of sack cleaner adopts coated filter material; The housing of sack cleaner is provided with companion's heat structure.
8. according to claim 5,6 or 7 described continuous drying equipments, it is characterized in that: said air heater adopts finned tube air heater (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2012100495077A CN102538426A (en) | 2012-02-29 | 2012-02-29 | Continuous drying process and equipment for cyclohexanone oximation catalyst |
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| CN2012100495077A CN102538426A (en) | 2012-02-29 | 2012-02-29 | Continuous drying process and equipment for cyclohexanone oximation catalyst |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105157394A (en) * | 2015-07-21 | 2015-12-16 | 苏州市自力化工设备有限公司 | Pharmacy mushroom dreg harmless treatment system |
| CN106352683A (en) * | 2016-10-20 | 2017-01-25 | 北京石油化工工程有限公司 | Catalyst precursor industrial drying method capable of being easily influenced by temperature and oxygen and system thereof |
| CN110006240A (en) * | 2019-05-10 | 2019-07-12 | 黎柴佐 | A kind of multistage powder drying processing unit and its method |
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| CN1537710A (en) * | 2003-04-14 | 2004-10-20 | 兰州瑞德干燥技术有限公司 | Polyvinyl alcohol two-stage drying technology |
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| CN105157394A (en) * | 2015-07-21 | 2015-12-16 | 苏州市自力化工设备有限公司 | Pharmacy mushroom dreg harmless treatment system |
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| CN110006240A (en) * | 2019-05-10 | 2019-07-12 | 黎柴佐 | A kind of multistage powder drying processing unit and its method |
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Application publication date: 20120704 |