CN104130359B - A kind of production technology of paraformaldehyde device - Google Patents
A kind of production technology of paraformaldehyde device Download PDFInfo
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- CN104130359B CN104130359B CN201410346647.XA CN201410346647A CN104130359B CN 104130359 B CN104130359 B CN 104130359B CN 201410346647 A CN201410346647 A CN 201410346647A CN 104130359 B CN104130359 B CN 104130359B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2/00—Addition polymers of aldehydes or cyclic oligomers thereof or of ketones; Addition copolymers thereof with less than 50 molar percent of other substances
- C08G2/08—Polymerisation of formaldehyde
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2/00—Addition polymers of aldehydes or cyclic oligomers thereof or of ketones; Addition copolymers thereof with less than 50 molar percent of other substances
- C08G2/28—Post-polymerisation treatments
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G4/00—Condensation polymers of aldehydes or ketones with polyalcohols; Addition polymers of heterocyclic oxygen compounds containing in the ring at least once the grouping —O—C—O—
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Abstract
The invention discloses a kind of production technology of paraformaldehyde device, including formaldehyde evaporation concentration device, mist projection granulating tower, fluidized bed dryer, cyclone separator and device for absorbing tail gas.The present invention uses constant pressure conveyer device and coordinates special shower nozzle that formalin high degree of dispersion is sprayed, and obtains the paraformaldehyde target product that uniform particle sizes and the degree of polymerization are about 11；The most at utmost reclaim heat and residual solid paraformaldehyde and be recycled to granulation tower, accelerating drying-granulating, having reached energy-saving and cost-reducing, reduced the purpose of production cost.
Description
Technical field
The invention belongs to technical field of chemical production equipment, particularly for paraformaldehyde process unit hardware.
Background technology
At present, the production technology of paraformaldehyde route that domestic and international application is more ripe mainly has following several: vacuum rake style drier is dried paraformaldehyde processed；Metal belt is dried paraformaldehyde processed；Nebulization；Azeotropic distillation.The product lumps difficulty that these processes obtain is pulverized, it is impossible to directly obtaining granular paraformaldehyde product, and floor space is big, energy consumption is big, is the most gradually eliminated.The most more advanced process is atomizing granulating technology, and the method is reliable and stable, and the product obtained is graininess paraformaldehyde.At present, owing to highly concentrated formaldehyde solution is during carrying out mist projection granulating, the paraformaldehyde degree of polymerization is difficult to control to about 12, affect product quality, in the atomizing granulating technology of most domestic producer, heat utilization rate is low simultaneously, and energy consumption is high, and clout reclaims not do and optimizes, cause product cost high, lack the market competitiveness.
Formalin can be polymerized during long-term storage or concentration operation, generates the polymer of paraformaldehyde-white powder linear structure.Reaction equation is as follows:
The balancing response generated is by H+The impact of concentration is relatively big, the existence of trace polar substances, as acid, alkali and water etc. all can accelerate the carrying out of polyreaction.Temperature also has an impact, and when temperature is low, reaction is moved to the direction generating polymer, then to the most mobile when temperature raises.Even depolymerization can generate monomer completely when temperature is the highest, in the presence of especially having acid, heating is more easy to make it be depolymerized to gaseous formaldehyde monomer.Prepare paraformaldehyde and it is critical only that the control product degree of polymerization, prevent formaldehyde high polymeric, shorten the drying and dehydrating time, improve product yield.Formalin is by being pumped in granulation tower, and forms the degree of polymerization paraformaldehyde at the uniform grading of about n=11 through shower nozzle ejection cooling polymerization, thus just can ensure that the quality of paraformaldehyde.
Summary of the invention
Goal of the invention: for problem and the defect of above-mentioned existence, the invention provides a kind of production technology of paraformaldehyde device, the paraformaldehyde granule that uniform particle sizes's degree of polymerization is about 12 can be prepared, and can effective recycling waste heat and by-product, thus reduce energy consumption and product cost, improve the market competitiveness.
Technical scheme: for achieving the above object, the present invention is by the following technical solutions: a kind of production technology of paraformaldehyde device, including formaldehyde evaporation concentration device, mist projection granulating tower, fluidized bed dryer, cyclone separator and device for absorbing tail gas, the outlet of described formaldehyde evaporation concentration device is connected by pipeline and under formaldehyde delivery pump effect with mist projection granulating column overhead entrance, and the top of mist projection granulating tower is provided with nitrogen delivery port；Described fluidized bed dryer is located at below mist projection granulating tower tower bottom outlet, and the bottom of fluidized bed dryer also is provided with nitrogen delivery port；The described gaseous phase outlet on spray granulating and drying device top all connects with the entrance of cyclone separator with the gaseous phase outlet of fluidized bed dryer, and the outlet of cyclone separator is then connected with device for absorbing tail gas；Wherein, described formaldehyde delivery pump is stabilized pressure pump, is provided with spiral material passage in the pipe of the shower nozzle that described mist projection granulating column overhead is arranged.
Further, described shower nozzle includes nozzle and the pipe joint being threaded connection, and described nozzle includes nozzle body and is located at the nozzle bore of nozzle body front end, and the centre of described nozzle body is embedded with dismountable screw-shaped flow paths blade.
Further, described nozzle bore includes bellmouth section and straight hole section, and the outer face of nozzle bore is the cambered surface of indent, thus the formaldehyde mist being beneficial to ejection at a high speed can mix rapidly dispersion, beneficially heat exchange cooling polymerization and form the paraformaldehyde of uniform polymerization degree with the nitrogen convection current sent into.
Further, described nozzle and pipe joint are for being vertically arranged, and form round corner section, thus when avoiding formalin to carry, direct current section is long, and the formaldehyde prepolymerization that mixing intensity causes not makes the degree of polymerization too high.
Further, after described fluidized bed dryer, it is additionally provided with screening machine, such that it is able to bulky grain paraformaldehyde product is reclaimed, obtains specific mesh number product.
Further, the bottom of described cyclone separator is additionally provided with conveying worm, and this conveying worm is connected with middle and lower part and the top of granulation tower respectively by pipeline and blower fan.Thus the paraformaldehyde dust being relatively dried that cyclone collection is obtained, carried top or the middle and lower part being delivered to granulation tower by nitrogen under the effect of blower fan, thus the paraformaldehyde granule random collision bigger with the humidity in granulation tower is accelerated to mix, while being agglomerated into uniform particle sizes's paraformaldehyde, play the effect accelerating drying and dehydrating.
Described formaldehyde evaporation concentration device includes the first absorption tower, vaporizer, primary separator and second-stage separator, the outlet of described vaporizer is connected with the entrance on primary separator top, primary separator outlet at bottom is connected with second-stage separator upper entrance by pump, and second-stage separator outlet at bottom is connected with mist projection granulating tower by pump；The top of described primary separator and second-stage separator is connected by the entrance of pipeline and the first bottom, absorption tower, and the stage casing on the first absorption tower and top are equipped with the entrance for dilute formalin that circulates；
The surge tank of band stirring it is additionally provided with between described second-stage separator and mist projection granulating tower, the outlet of described second-stage separator is inserted at the bottom of surge tank by pipeline and is in below formaldehyde liquid level, formaldehyde ullage leaves space, and the top of surge tank is provided with the pipeline of logical nitrogen, it is connected with mist projection granulating tower entrance by pipeline bottom surge tank.
Described device for absorbing tail gas includes the first absorption tower, second absorption tower and the 3rd absorption tower being sequentially connected with, and forms circulation line at the bottom of the tower top on each absorption tower and tower, and circulation line is provided with heat exchanger.
Described stabilized pressure pump includes the delivery pump on pipeline, and is at least provided with buffer in delivery pump side.
Beneficial effect: compared with prior art, the invention have the advantages that employing constant pressure conveyer device and coordinates special shower nozzle that formalin high degree of dispersion is sprayed, obtaining the paraformaldehyde target product that uniform particle sizes and the degree of polymerization are about 11；The most at utmost reclaim heat and residual solid paraformaldehyde and be recycled to granulation tower, accelerating drying-granulating, having reached energy-saving and cost-reducing, reduced the purpose of production cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of formalin evaporation concentration device of the present invention；
Fig. 2 is the structural representation of mist projection granulating of the present invention and drying device；
Fig. 3 is the structural representation of device for absorbing tail gas of the present invention.
Fig. 4 is the structural representation of mist projection granulating tower of the present invention；
The structural representation of airflow-distribution board in Fig. 5 mist projection granulating of the present invention tower；
The structural representation of Fig. 6 distribution showerhead of the present invention；
Fig. 7 is the partial enlarged drawing of a-quadrant in Fig. 6；
Fig. 8 is the structural representation of scraper-type separator of the present invention；
Fig. 9 is scraper-type separator cross section structure schematic diagram of the present invention.
Wherein, vaporizer 1, primary separator 2, second-stage separator 3, surge tank 4, mist projection granulating tower 5, fluidized bed dryer 6, cyclone separator 7, first grade absorption tower the 8, first absorption tower 9, second absorption tower the 10, the 3rd absorption tower 11, heat exchanger 12, delivery pump 13, stabilized pressure pump 14；Central shaft 31, connecting rod 32, peripheral dry 33, ring for fixing 34, elastic scraper 35, blend stop 36；The anti-blocking scarce figure of surge tank stabilized pressure pump；Tower body 51, air distributor 52, internal ring air channel 521, outer shroud air channel 522, nitrogen inlet 523, air flue 524, shower nozzle 53, nozzle 531, pipe joint 532, nozzle body 533, nozzle bore 534, screw-shaped flow paths blade 535, outer face 536, stepped cambered surface 537；Fluidised bedplate 61, bulge 62.
Detailed description of the invention
Below in conjunction with the accompanying drawings and specific embodiment, it is further elucidated with the present invention, it should be understood that these embodiments are merely to illustrate the present invention rather than limit the scope of the present invention, after having read the present invention, those skilled in the art all fall within the application claims limited range to the amendment of the various equivalent form of values of the present invention.
As described in Figure 1, a kind of production technology of paraformaldehyde device, mainly include three parts: formalin evaporation concentration device, mist projection granulating and drying device and device for absorbing tail gas.
Part I: formalin evaporation and concentration
Wherein, formalin evaporation concentration device mainly includes vaporizer, primary separator, second-stage separator and the surge tank being sequentially connected with.In order to improve evaporation and concentration efficiency, in the present embodiment, dilute formalin of about 40% passes through raw material transport pump to vaporizer, enter after evaporating with the steam heat-exchanging in vaporizer chuck in primary separator, 60～70 DEG C, carry out gas-liquid separation under conditions of pressure-30～-60KPa, gas phase portion is gone out (preferably from primary separator top, gas phase is sent into absorption tower and is reclaimed), obtain after concentrating 70～85% formalin flow out from the bottom of primary separator, and sent in second-stage separator by formaldehyde delivery pump and concentrate further.This second-stage separator is scraper-type, it includes air flow inlet, cylindrical tube, caged rotating cylinder and elastic scraper, cage-like rotating cylinder be located at cylindrical tube center, a side of elastic scraper is located on the circumference of caged rotating cylinder, and another side rides over the inwall of cylinder；Described air flow inlet is tangentially-arranged along cylinder and turns to equidirectional setting with caged rotating cylinder.After formalin enters into second-stage separator (scraper-type separator), scraper plate rotational agitation formalin, under about the blend stop of the head-on side that scraper plate rotates, formalin is more prone to upwards be centrifuged spring up, improve the liquid membrane of cylinder inboard wall, thus accelerate evaporation and concentration, formalin that matched is is sent into the opening's edge separator tangential direction that enters of second-stage separator (scraper-type separator) and is arranged, so that formalin can tangentially enter raising evaporation effect along inwall；Simultaneously because the existence of blend stop can produce the disturbance parallel zonule solution backflow of appropriateness to liquid stream, be possible to prevent the prepolymerization of formaldehyde thus the granulation uniformity of follow-up mist projection granulating paraformaldehyde.The present embodiment uses another consideration of blend stop scraper plate to be: if using common rotating vane, on the one hand there is no liquid stream disturbance, formaldehyde is easily polymerized when film-forming state is evaporated and concentrating, and on the other hand can improve film forming area, thus improve evaporation and concentration speed.Simultaneously because the existence of blend stop can produce the disturbance parallel zonule solution backflow of appropriateness to liquid stream, be possible to prevent the prepolymerization of formaldehyde thus the granulation uniformity of follow-up mist projection granulating paraformaldehyde.
Preferably, first absorption tower can also be set in evaporation concentration device, send into the bottom on the first absorption tower from primary separator and the second-stage separator top gas containing formaldehyde out by pipeline to carry out formaldehyde absorption and obtain dilute formaldehyde, thus reclaimed formaldehyde and reduced cost, reducing discharge to prevent from polluting environment, the tail gas after absorbing is re-fed into device for absorbing tail gas and processes.Further improving, the first absorption tower is divided into three absorber portions from bottom to up, and the outlet bottom each absorber portion forms circulation by formaldehyde circulating pump with the connection of corresponding absorber portion top entry.
Preferably, the pipeline that described formaldehyde evaporation concentration device is connected with spray granulating and drying device entrance is provided with the arm for the pure water that circulates, and this arm is provided with anti-blockage valve.Thus when process unit needs parking maintenance to safeguard, close formaldehyde conveying valve, open anti-blockage valve and carry pure water the pipeline of whole process unit is carried out, prevent formaldehyde or paraformaldehyde polymerization thus block pipeline.
Preferably, second-stage separator (dual circulation concentration) is divided into three absorber portions from bottom to up, and the outlet bottom each absorber portion forms circulation by formaldehyde circulating pump with the connection of corresponding absorber portion top entry, thus greatly accelerates the evaporation and concentration of formaldehyde.
The surge tank of band stirring it is additionally provided with between described second-stage separator and mist projection granulating tower, the outlet of described second-stage separator is inserted at the bottom of surge tank by pipeline and is in below formaldehyde liquid level, formaldehyde ullage leaves space, and the top of surge tank is provided with the pipeline of logical nitrogen, it is connected with mist projection granulating tower entrance by pipeline bottom surge tank.Formalin concentration after two-stage nitration concentrates is up to 85～95%, enter in surge tank, owing to formaldehyde ullage is passed through the nitrogen of certain pressure it is thus possible to guarantee that the formalin sent in granulation tower is constant pressure, thus when forming spraying by shower nozzle, energy is fully dispersed, obtains the paraformaldehyde granule of uniform particle sizes.
Found by debugging and verification repeatedly: for obtaining the degree of polymerization about 12, particle diameter is at the paraformaldehyde target product of 10～100 mesh (preferably 20～60 mesh), key one of which is to ensure that the concentration formalin sent in mist projection granulating tower must constant voltage be sent into, and forms the formaldehyde mist of high degree of dispersion through shower nozzle ejection at a high speed and cools down with following current nitrogen contact heat-exchanging.The present invention provides two kinds of voltage stabilizing embodiments: (1) arranges the surge tank of band stirring between second-stage separator and mist projection granulating tower, second-stage separator outlet is inserted directly into the bottom of surge tank by pipeline and is in below the liquid level of formalin, more than liquid level leave space, now tank body top arranges the entrance of logical nitrogen, it is passed through the pressure of nitrogen at about 5MPa, it is thus possible to guarantee to send into the constant pressure of formaldehyde in granulation tower by Valve controlling.(2) second way is to be respectively provided with ripple damper on the pipeline of delivery pump both sides simultaneously, and the volume of ripple damper is more than the 1% of unit hour formalin conveying capacity, it is thus possible to keep pressure amplitude to control below 3%.
Part II: mist projection granulating is with dry
Mist projection granulating tower is tubular, and lower bottom part is conical head, and it mainly includes tower body, is located at the products export bottom tower body, is located at the formalin entrance at tower body top and is located at the nitrogen inlet on tower body top, and described nitrogen inlet connects air distributor；Shower nozzle is also set up inside tower body, this shower nozzle is mainly made up of nozzle and pipe joint, wherein nozzle includes nozzle body and is located at the nozzle bore of body front end, nozzle body is rectangular shaped, tail end is connected with pipe joint screw thread, nozzle body center is annular channel, is embedded screw-shaped flow paths blade in this passage；Nozzle bore includes the straight hole section of conical section and aperture simultaneously, so that the formalin flowed through forms high speed rotating dispersing morphology, ejects and forms the vaporific of high dispersive, and the employing of screw-shaped flow paths blade is embedded mode and can conveniently dismantle.Simultaneously, we improve nozzle bore further, the outer face of nozzle bore is designed to the stepped cambered surface of indent, the height of ladder is 1mm, and ladder is fillet design, making formalin spray at a high speed arcuately end face from nozzle bore and form fluffy shape obliquely, the nitrogen entered with granulation tower top while advantageous distribution forms strong convection heat exchange.Preferably, curved end is designed to the step-like atomizing effect that can be effectively improved, thus carries out heat exchange cooling with nitrogen.Additionally, nozzle body uses quarter bend dihedral to become, the formalin entered from pipe joint is made to form mixed flow around the corner, it it is laminar flow when avoiding formalin to enter, because when rectilinear duct length reaches a timing, the liquid flowed through can be formed on geo-stationary, and relative flowing tails off thus improves the poly ferric sulfate of formaldehyde.
Supporting with mist projection granulating tower must also include stabilized pressure pump, by combining of the shower nozzle of this stabilized pressure pump and above-mentioned special construction, the specific surface area of formaldehyde polymer can be greatly improved effective depth dispersion hydrojet, the degree of polymerization of the paraformaldehyde that final lyophilization obtains is about 11, and particle size distribution is uniform.Operating condition in mist projection granulating tower is 5～30 DEG C, carry out under vacuumized conditions, the nitrogen nitrogen inlet from tower body top is sent into, through stream of nitrogen gas distribution grid, the nitrogen feeding of low temperature is fully contacted heat exchange cooling with vaporific formalin, and with shower nozzle ejection formaldehyde spray film concurrent, thus avoid reflux type formed disturbance and end stream cause paraformaldehyde partial polymerization excessive.As improvement project, described air distributor includes that internal ring air channel and outer shroud air channel, described outer shroud air channel are provided with nitrogen inlet, and outer shroud air channel is relatively small away from the caliber of the side of nitrogen inlet；Connected by multiple air flues between the inner side in described internal ring air channel and the outside in outer shroud air channel.
Mist projection granulating tower top is provided with nitrogen outlet, nitrogen is through being still mingled with a small amount of paraformaldehyde product after formaldehyde spraying heat exchange, and extract out from nitrogen outlet, it is then fed in the cyclone separator of two series connection carrying out gas-liquid separation, obtains clean nitrogen tail gas and be used for inner loop.In order to control oxygen content in circulating air so that it is less than blast value, need to maintain a small amount of purging gas, this gas discharges after gas scrubbing tower washing is qualified.Then deliver to drying fluidized-bed from the solid-state paraformaldehyde of cyclone separator isolated from bottom and reclaim dry further.Preferably, the bottom of described cyclone separator is additionally provided with conveying worm, and this conveying worm is connected with middle and lower part and the top of granulation tower respectively by pipeline and blower fan.Thus the paraformaldehyde dust being relatively dried that cyclone collection is obtained, carried top or the middle and lower part being delivered to granulation tower by nitrogen under the effect of blower fan, thus the paraformaldehyde granule random collision bigger with the humidity in granulation tower is accelerated to mix, while being agglomerated into uniform particle sizes's paraformaldehyde, play the effect accelerating drying and dehydrating.
After mist projection granulating tower freezing polymerization, obtain the paraformaldehyde about polymerization degree n=11, owing to surface moisture has relatively juicy, therefore also need to be dried through vibration type drying fluidized-bed.Aforementioned drying fluidized-bed is vibration three stage structure, and including one-level dryer section, secondary drying section and cooling section, the base plate of every section is uniformly provided with multiple pore for leading to nitrogen, and this pore is opened in the bulge of projection.Wherein, the air vent openings in the bulge of the surrounding position of one-level dryer section base plate is towards central part, and the air vent openings in central part bulge is towards secondary drying section；Opening in secondary drying section and three-stage drying section base plate bulge towards next stage dryer section, corresponding arranges gas blower three sections of bottoms, by blower fan, nitrogen is blown over paraformaldehyde solid to be dried, thus accelerates be dried and reclaim heat.And the vibration of base plate generally swing type, particular by the Swing Arm being located under base plate, and realized by driven by motor.In technology controlling and process, the temperature of one-level dryer section controls at 45～80 DEG C, and this section of temperature is relatively low, is to prevent paraformaldehyde granule top layer over-drying；Secondary drying section temperature controls at 50～100 DEG C, and this section is strengthening segment, is on the one hand dried paraformaldehyde further, is dried, so that the nitrogen flowed through can reclaim more heat simultaneously because concentrate this section to heat up；Three-stage drying section is cooling section, and this section of temperature controls at 10～40 DEG C.
Additionally, in order to reclaim the paraformaldehyde solid being mingled with in the nitrogen of blowout, the gas of blowout is sent into the 3rd cyclone separator and is carried out cyclonic separation by us, the paraformaldehyde recovery of cyclone collection is sent drying fluidized-bed back to and is continued to be dried, and the gas separated from cyclone separator top is then for inner loop.
Part III: device for absorbing tail gas
Device for absorbing tail gas in the present invention includes the first absorption tower, second absorption tower and the 3rd absorption tower being sequentially connected with, and the outlet on each absorption tower is provided with heat exchanger, is recycled by absorption liberated heat, thus reduces the consumption of steam.
Claims (8)
1. a production technology of paraformaldehyde device, it is characterised in that: include formaldehyde evaporation concentration device, spray
Mist granulation tower, fluidized bed dryer, cyclone separator and device for absorbing tail gas, described formaldehyde evaporation concentration device
Outlet be connected by pipeline and under formaldehyde delivery pump effect with mist projection granulating column overhead entrance, mist projection granulating tower
Top be provided with nitrogen delivery port；Described fluidized bed dryer is located at below mist projection granulating tower tower bottom outlet, fluidisation
The bottom of bed dryer also is provided with nitrogen delivery port；The gaseous phase outlet on described spray granulating and drying tower top and fluidisation
The gaseous phase outlet of bed dryer all connects with the entrance of cyclone separator, and the outlet of cyclone separator is then inhaled with tail gas
Receiving apparatus connects；Wherein, described formaldehyde delivery pump is stabilized pressure pump, the shower nozzle that described mist projection granulating column overhead is arranged
Pipe in be provided with spiral material passage；Described shower nozzle includes nozzle and the pipe joint being threaded connection, described
Nozzle includes nozzle body and is located at the nozzle bore of nozzle body front end, and the centre of described nozzle body is embedded
There is dismountable screw-shaped flow paths blade；Described stabilized pressure pump includes the delivery pump on pipeline, and at least at delivery pump
Side is provided with buffer.
Production technology of paraformaldehyde device the most according to claim 1, it is characterised in that: described nozzle bore
Including bellmouth section and straight hole section, and the outer face of nozzle bore is the cambered surface of indent.
Production technology of paraformaldehyde device the most according to claim 2, it is characterised in that: described nozzle and
Pipe joint is for being vertically arranged, and forms round corner section.
4. according to the arbitrary described production technology of paraformaldehyde device of claims 1 to 3, it is characterised in that: described
Screening machine it is additionally provided with after fluidized bed dryer.
5. according to the arbitrary described production technology of paraformaldehyde device of claims 1 to 3, it is characterised in that: described
The bottom of cyclone separator is additionally provided with conveying worm, and this conveying worm is by pipeline and blower fan and granulation tower
Middle and lower part and top connect respectively.
6. according to the arbitrary described production technology of paraformaldehyde device of claims 1 to 3, it is characterised in that: described
Formaldehyde evaporation concentration device includes the first absorption tower, vaporizer, primary separator and second-stage separator, described steaming
The outlet sending out device is connected with the entrance on primary separator top, and primary separator outlet at bottom passes through pump and two fraction
Connecting from device upper entrance, second-stage separator outlet at bottom is connected with mist projection granulating tower by pump；A described fraction
Connected by the entrance of pipeline and the first bottom, absorption tower from the top of device and second-stage separator, the first absorption tower
Stage casing and top are equipped with the entrance for dilute formalin that circulates.
Production technology of paraformaldehyde device the most according to claim 6, it is characterised in that: described two fraction
From being additionally provided with the surge tank that band stirs between device and mist projection granulating tower, pipeline is passed through in the outlet of described second-stage separator
Inserting at the bottom of surge tank and be in below formaldehyde liquid level, formaldehyde ullage leaves space, and the top of surge tank sets
There is the pipeline of logical nitrogen, be connected with mist projection granulating tower entrance by pipeline bottom surge tank.
8. according to the arbitrary described production technology of paraformaldehyde device of claims 1 to 3, it is characterised in that: described
Device for absorbing tail gas includes the first absorption tower, second absorption tower and the 3rd absorption tower being sequentially connected with, each absorption
Forming circulation line at the bottom of the tower top of tower and tower, circulation line is provided with heat exchanger.
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| CN201410346647.XA CN104130359B (en) | 2014-07-21 | 2014-07-21 | A kind of production technology of paraformaldehyde device |
| PCT/CN2014/089906 WO2016011724A1 (en) | 2014-07-21 | 2014-12-03 | Paraformaldehyde production apparatus |
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| CN201410346647.XA CN104130359B (en) | 2014-07-21 | 2014-07-21 | A kind of production technology of paraformaldehyde device |
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| CN104130359B (en) * | 2014-07-21 | 2016-11-23 | 江苏凯茂石化科技有限公司 | A kind of production technology of paraformaldehyde device |
| CN105523925B (en) * | 2015-12-14 | 2017-12-12 | 青岛科技大学 | A kind of continous way removing means for heavy solvent method TDI residues |
| CN106631735B (en) * | 2016-12-03 | 2023-10-20 | 湖北泰盛化工有限公司 | System for depolymerizing paraformaldehyde and method and application thereof |
| CN106678764B (en) * | 2017-02-24 | 2022-09-09 | 查都(海南)科技有限公司 | Waste heat comprehensive utilization system in polyformaldehyde production process |
| CN108151815A (en) * | 2017-12-27 | 2018-06-12 | 中核四0四有限公司 | A kind of device for pressure measurement and measuring method suitable for denitration fluid bed |
| CN109443894B (en) * | 2018-12-29 | 2021-01-05 | 中国地质调查局油气资源调查中心 | Water-gas interface methane and carbon dioxide online monitoring system and method |
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| CN1560102A (en) * | 2004-02-26 | 2005-01-05 | 四川大学 | Preparation process for polymeric formol of high formol content |
| CN202297438U (en) * | 2011-10-31 | 2012-07-04 | 江苏恒茂机械制造有限公司 | Paraformaldehyde production equipment |
| CN203999470U (en) * | 2014-07-21 | 2014-12-10 | 江苏凯茂石化科技有限公司 | A kind of production technology of paraformaldehyde device |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2016011724A1 (en) | 2016-01-28 |
| CN104130359A (en) | 2014-11-05 |
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