CN108159844A - The device and method of methanol removal in a kind of pyrolysis product from methyl tertiary butyl ether(MTBE) - Google Patents
The device and method of methanol removal in a kind of pyrolysis product from methyl tertiary butyl ether(MTBE) Download PDFInfo
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- CN108159844A CN108159844A CN201810059112.2A CN201810059112A CN108159844A CN 108159844 A CN108159844 A CN 108159844A CN 201810059112 A CN201810059112 A CN 201810059112A CN 108159844 A CN108159844 A CN 108159844A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1487—Removing organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1493—Selection of liquid materials for use as absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/20—Organic absorbents
- B01D2252/202—Alcohols or their derivatives
- B01D2252/2021—Methanol
Abstract
The invention discloses a kind of device and methods of methanol removal in pyrolysis product from methyl tertiary butyl ether(MTBE).By MTBE pyrolysis products and absorbing liquid in Multi-stage airflow shears cross-flow bed cross-flow counter current contacting, under the shear action of high speed rotation filler, cracking gas and absorbing liquid are repeatedly disperseed, coalescence and redisperse, realize multistage absorption.Cracked gas is led in the gas feed of Multi-stage airflow shearing cross-flow bed side bottom, the gas vent at top is connected with purified gas workshop section, the liquid-inlet of side roof part is passed through absorbing liquid, the liquid outlet of bottom is used to discharge absorbing liquid, liquid-inlet is connected with pump, and the liquid outlet of Multi-stage airflow shearing cross-flow bed is then connected with rich solution slot；Multi-stage airflow shearing cross-flow bed includes liquid distribution trough, liquid is collected and redistributor, rotor, stator, driving device and shell.The equipment gas, totally in counter current contacting, makes mass transfer force bigger between gas-liquid, improves cracking gas degree of purification, improve and absorb methanol concentration and absorbing liquid utilization rate in rich solution with absorbing liquid.
Description
Technical field
The present invention relates to a kind of device and methods of methanol removal in pyrolysis product from methyl tertiary butyl ether(MTBE), belong to methanol and take off
Except technical field.
Background technology
Isobutene is a kind of very important industrial chemicals, according to the difference of purity, is broadly divided into and exists with admixture
Mixed fraction isobutene and high-purity isobutylene.Isobutene content is high-purity generally 44% ~ 49% in mixed fraction isobutene
Degree isobutene is often referred to the isobutene product that isobutene purity is higher than 99.5%.High-purity isobutylene is mainly for the production of butyl rubber
A series of widely used, added values such as glue, polyisobutene, methacrylonitrile, tert-butyl mercaptan, tertiary butyl phenol, antioxidant, tert-butylamine
High, the domestic downstream product being badly in need of.As high added value fine chemical product is accelerated development in countries in the world, as fine chemistry industry original
The demand of the high-purity isobutylene of material is growing day by day.The high-purity isobutylene of domestic enterprise's production at present is substantially full in terms of quality
Foot trip product demand, but needed to be strengthened in terms of energy consumption it is energy-saving, especially in separation methanol workshop section.
At present, methyl tertiary butyl ether(MTBE)（MTBE）Cracking process is one of major technique for producing isobutene in the world.MTBE methods
It is to utilize the isobutene in raffinate C 4 fraction and methanol MTBE obtained by the reaction, the side of further cracking high-purity isobutylene
Method.The technology raw material is easy to get, and technical process is simple, and production scale is big, and the high conversion rate of MTBE is up to 99.8%, and due to different
Butylene and methanol selectivity are high, and cracking by-product is few, and catalyst activity stability is good.Its brief technique is：MTBE and cycle
MTBE- methanol is combined into reaction tower, and isobutene and methanol are cracked under catalyst action, generates the condensed separation of product
Afterwards, upper strata is isobutene, and lower floor is methanol.To upper strata product, by-product methyl ether and light component are first removed, obtains being mixed with methanol
Isobutene is subsequently sent to carry out rectifying in isobutene rectifying column, and the techniques such as washing, dry are to get high-purity isobutylene finished product.For
Methanol content in product is made to meet the requirement of high-purity isobutylene（Such as use aforesaid operations flow）A large amount of inhale must be used
Liquid is received, and builds number seat height up to tens meters of absorption tower, this not only increases construction areas and expenditure of construction, also carry significantly
The cycling use of water amount of high equipment, the energy and material consumptions such as quantity of steam and electricity consumption.Therefore, how in efficient removal MTBE pyrolysis products
Methanol, reduce construction area it is energy saving and reduce production cost seem most important.
It is industrial at present methanol mainly to be detached using Physical Absorption method, and different technical process takes different physics
Absorption process is detached.For example, in petrochemical enterprise methanol removal by setting more water scrubbers, using suitable gas liquid ratio
Achieve the purpose that detach methanol；In residual oil gasification flow and coal pressure gasification flow, usually using molecular sieve as adsorbent
Low-temperature adsorption deep removal methanol；Made in Alcohol Plant produces food-grade carbon-dioxide methanol removal technique using molecular sieve
For adsorbent.These absorption process are all using conventional suction tower as mass transfer apparatus, under gas and the tower top spray being passed through from bottom of towe
Liquid in tower counter current contacting, so as to fulfill the purpose of methanol removal.Detach the mass-transfer efficiency and absorbent of methanol plant
Absorbability directly affects the removal efficiency of methanol and the internal circulating load of absorbent, and then influences production cost.Due to traditional suction
Receipts tower mass-transfer efficiency is low, and the absorption tower processing for building one or number seat height up to more than tens rice is needed to can be only achieved product requirement, is made
Enterprise builds the place on absorption tower, cost remains high, and absorbent internal circulating load is big.It is filled according to the high separation methanol of absorptivity
It puts, the expense and floor space of building equipment can be reduced, while reduce the internal circulating load of absorbent, so as to reduce energy consumption.Therefore,
It is to reduce production cost, energy-saving effective using the high separation equipment of mass-transfer efficiency and the strong absorbing liquid of selection absorbability
Approach.
Methanol absorption liquid is nontoxic, tasteless, cheap and easy to get, free from environmental pollution, has good chemical stability and thermostabilization
Property, it does not react under conditions of use.The process that methanol absorption liquid absorbs methanol has typical Physical Absorption feature.Methanol
It can be dissolved each other with methanol absorption liquid with arbitrary proportion.Under the conditions of working temperature, solubility of the methanol in methanol absorption liquid is obeyed
Henry's law, as pressure reduction, temperature increase and reduces.
Methanol absorption liquid absorbs methanol and belongs to gas-film controlled process.Therefore, it in the design and selection of mass transfer apparatus, should carry
High gas phase flow velocity, gas phase turbulence, gas liquid cross-flow contact and increase phase border contact area etc. improve mass-transfer efficiency with this.
Cross_flow rotating packed bed is a kind of novel chemical process intensification equipment.On earth, by rotate generate from
Mental and physical efforts can realize Elevated Gravity.Under Elevated Gravity, the intermolecular molecule diffusion of different size and interphase mass transfer process are equal
Than conventional articulated gravity off field much faster, gas-liquid, liquid-liquid diphase are in hundreds times bigger than earth gravitational field even thousands of times of hypergravities
Violent flow contact is generated in porous media or duct under environment, huge shearing force can tear liquid into micron to receiving
Brin, drop and the liquid film of meter level, realize the quick update of boundary, and mass transfer rate improves 13 quantity than traditional tower equipment
Grade, greatly enhances mass transport process and microcosmic mixing.It therefore, can as the equipment of separation methanol using cross_flow rotating packed bed
To reduce the usage amount of absorbing liquid and internal circulating load, production and construction expense and floor space are substantially reduced, so as to reduce methanol removal
Cost and energy consumption.
Chinese invention patent " a kind of method for removing carbon dioxide in conversion gas "（CN 101168115A）And Chinese invention
Patent " method and device of carbon dioxide removal in a kind of gas from synthetic-ammonia transformation "（CN 102125795A）In all propose and grind
Studied carefully cross_flow rotating packed bed has good effect in mass-transfer progress is strengthened.Rotary packed bed basic structure includes
Liquid distribution trough, filler and shell three parts, operation principle are：Liquid is entered by liquid-inlet, will by liquid distribution trough
Liquid is uniformly sprayed at filler inner edge, and under the centrifugal force effect generated in rotation, liquid passes radially through filler, with gas cross-flow
After contact carries out mass transfer and reacts, discharged through shell by liquid outlet.
In rotary packed bed, gas is continuous phase, and liquid is dispersed phase, therefore can liquid be evenly distributed in filler
Directly affect rotary packed bed mass transfer effect.It is typically ripple silk net in the filler of rotary packed bed middle use, net metal,
The fillers such as metal foam, Raschig ring although providing place for gas-liquid contact, cannot solve the problems, such as that liquid is uniformly distributed,
And gas-liquid contact is not enough for the reaction having, time of contact is short, undesirable so as to cause mass transfer effect.Liquid be
Filler inner edge is sprayed under the action of liquid distribution trough, therefore the quality of its structure directly affects the uniformity of liquid distribution,
Therefore liquid distribution trough is most important.
Invention content
The present invention is intended to provide in a kind of pyrolysis product from methyl tertiary butyl ether(MTBE) methanol removal device and method, propose one
Kind shears cross-flow bed as absorption equipment using Multi-stage airflow, using methanol aqueous solution as absorbent, passes through Physical Absorption method and removes MTBE
The method of methanol in pyrolysis product, absorbent are contacted with cracking gas in Multi-stage airflow shears cross-flow bed with cross-flow-reflux type
It absorbs, realizes deep removal methanol gas, and obtain the purpose of higher concentration rich solution.
The present invention provides a kind of devices of methanol removal in pyrolysis product from methyl tertiary butyl ether(MTBE), are cut including Multi-stage airflow
Cross-flow bed is cut, Multi-stage airflow shearing cross-flow bed side bottom is equipped with gas feed, is passed through cracked gas, Multi-stage airflow shearing cross-flow bed
Top is equipped with gas vent, and workshop section is connected with purified gas, and Multi-stage airflow shearing cross-flow bed side roof part is equipped with liquid-inlet, for leading to
Enter absorbing liquid, the bottom of Multi-stage airflow shearing cross-flow bed is equipped with liquid outlet, and for discharging absorbing liquid, liquid-inlet is with pumping phase
Even, the liquid outlet of Multi-stage airflow shearing cross-flow bed is then connected with rich solution slot；
The Multi-stage airflow shearing cross-flow bed includes liquid distribution trough, liquid is collected and redistributor, rotor, stator, driving electricity
Machine, negative pulley wheel and shell；Filler rotor replaces installation with filler stator, is coaxially disposed from top to bottom in the equipment, to fill out
Anticipate son to rise, with filler rotor end, filler rotor center is provided with liquid distribution trough, and liquid distribution trough is connect with liquid-inlet；
Filler stator is connected with revolving bed housing, and filler rotor is connect with shaft, negative pulley wheel and the driving motor phase of shaft lower end
Even；
The liquid distribution trough includes ring sleeve, collecting tank, diversion pipe, and ring sleeve includes at least two, the annular sleeve
Pipe is made of two coaxial sleeves, and ring sleeve is placed on the outside of shaft, is filler rotor on the outside of ring sleeve, outside ring sleeve
Several holes are uniformly provided on tube wall；Collecting tank is located at the bottom outside of this layer of filler rotor, connects with revolving bed inner walls, collection
Liquid bath is communicated by diversion pipe with lower floor ring sleeve；Filler rotor of the liquid through rotation that upper strata ring sleeve sprays repeatedly divides
It dissipates with after coalescence, collecting eddy flow through housing and entering in collecting tank, the ring sleeve that lower floor is flowed to along diversion pipe sprays.
In above device, the ring sleeve is placed between shaft and filler rotor, and ring sleeve is determined across filler
Son is simultaneously fixed with filler stator with welding manner, prevents gas short-circuit, several holes, liquid are uniformly provided on the outer tube wall of ring sleeve
Body, which is sprayed along the hole across filler rotor, to be entered in collecting tank；
The hole is round hole or grate opening；The number in hole is determined by fluid flow and flow velocity.
In above device, the collecting tank is circular ring shape, and section is U-shaped, is by annular sheet, inner cylinder, rotation
The U-lag of bed inner walls composition, collecting tank are located at revolving bed case inside, and annular sheet is perpendicular to inner walls and is welded on
In inner walls, for collecting liquid；The inner cylinder is to be welded with the body concentric cylinder of shell, inner cylinder bottom with annular sheet
It is integrated.
In above device, the diversion pipe is round tube, positioned at the lower part of collecting tank, diversion pipe lower end with next layer
Liquid distribution trough is connected；Diversion pipe is arranged below collecting tank, is uniformly provided with 2 ~ 8, uniformly oblique along collecting tank circumferencial direction
It is set downwardly toward center of circle direction, several diversion pipes form pyramidal structure.
The diameter of the diversion pipe is determined that flow rate of liquid is controlled in 0.01-1m/s by flow rate of liquid.
In above device, the inner cylinder height is determined by absorption flow quantity, collects the amount of liquid no more than the circle
The height of cylinder.
The present invention is based on gas phase shearing thought is strengthened, enhance flow perturbation and increase the Relative sliding speed between gas and filler
Degree devises Multi-stage airflow shearing cross-flow bed.Feature one be there are two or more than two rotors and two or more stators
It is alternately arranged axially；Feature is second is that liquid distribution trough can make liquid in the radial and axial filler for being uniformly distributed in rotor
Edge；While feature three is that liquid collection can make the liquid of higher level's rotor come together in together with redistributor, it is suitable that gas is not influenced
Profit by with distribution, and on the whole with gas in counter current contacting absorb.Multi-stage airflow shearing cross-flow bed of the present invention and common rotation
The difference of packed bed is that have four layers and above filler, and filler rotor is rotated synchronously with motor, generates the super gravity field of gas-liquid contact；
Filler stator is static, and effect is the swirling eddy formed after lower floor's filler to be blocked and strong disturbance.Gas
After lower floor's rotor high speed shear, spiral is blocked, gas is circumferentially rotatable by filler stator by filler stator
Trend is weakened, and gas is redistributed.Then gas is upwardly through filler rotor, again by high speed shear, so as to increase
The disturbance and dispersion of air-flow, reduce air film resistance, so as to enhance mass transferring in gas phase.Final liquid is by pressure in gravity and bed
Effect is discharged from liquid outlet.
Liquid distribution trough in Multi-stage airflow provided by the invention shearing cross-flow bed, it is innovative devise ring sleeve,
Collecting tank, diversion pipe are uniformly distributed liquid, collect and be uniformly distributed again, make the mass transfer between gas-liquid more fully and repeatedly anti-
It is multiple to carry out.The code for structural design of the liquid distribution trough flow path of liquid forms good collection and redistribution, so as to
Make the mass transfer between gas-liquid more abundant, since every level-one gas-liquid is cross-flow, treating capacity is big, and on the whole from the point of view of be adverse current, absorb
Effect and mass transfer are more abundant.
The present invention provides a kind of method of methanol removal in pyrolysis product from methyl tertiary butyl ether(MTBE), using above device,
Include the following steps：
MTBE pyrolysis products are sheared cross-flow bed cross-flow by Multi-stage airflow with absorbing liquid to contact, in the shearing of high speed rotation filler
The lower removing for completing methanol gas of effect；Control parameter is as follows：
Liquid gas volumetric flow ratio is 1：100~300；
Multi-stage airflow shearing cross-flow bed rotor rotating speed be：100~1800r/min；
Absorbing liquid is：Methanol aqueous solution；
Absorption pressure is：0.1~2MPa；
Absorbing temperature is：40~100℃；
Methanol concentration is：＜ 30%（Mass fraction）.
The detailed process of the above method is：Cracked gas is passed through from gas feed, gas is first subjected to lowest level and revolves at a high speed
Helically mode rises after the filler shearing turned, and then by being sheared again during central rest stator, gas radially rotates
Trend be eliminated or weaken, the increase of gas less turbulence, the gas finally redistributed is high-speed rotating upwardly through upper strata
Filler is again by high speed shear；Gas redistributes after being sheared by multistage filler, effectively reduces gas film mass transfer resistance；
Meanwhile absorbing liquid enters liquid distribution trough from liquid-inlet, is sprayed on high-speed rotating filler rotor, is sheared by rotor
It into brin, drop or liquid film, is contacted with upward gas cross-flow, gas-liquid is on the whole in counter current contacting, so as to effectively strengthen gas
Liquid mass transport process realizes the function of the multiple absorption cleaning of single device, improves the concentration for absorbing rich solution.
In the above method, liquid gas contacts in a counter-current configuration on the whole in Multi-stage airflow shears cross-flow bed, each layer rotor
On contacted with cross-current flow.
The novelty of the present invention is mainly reflected in：1. the innovation of device：The advantage of design Multi-stage airflow shearing cross-flow bed exists
In：First, the features such as mass-transfer efficiency height, the filler using hypergravity equipment are few, and minimum spray density is small, can reduce absorption liquid
Flow, recycles or greatly reduces absorbing liquid internal circulating load without absorbing liquid, and follow-up methanol rich solution treating capacity reduces；Second is that single device
Realize multistage（More）Absorption function；Third, overweight machine equipment is small, driving and parking is convenient, flexibly, with good investment, maintenance cost
It is low.2. the innovation of technique：High-gravity technology is applied in traditional removing isobutene in the technique of methanol gas, is solved
The problems such as methanol gas degree of purification is low, rich solution depth is not high enough improves the removal efficiency of methanol gas, after reducing methanol gas
The problems such as continuous treatment process.In conclusion Multi-stage airflow shearing cross-flow bed is prepared into isobutene polymer grade production applied to tradition
In flow, the effect that Multi-stage airflow shearing cross-flow bed is strengthened to absorbing methanol gas mass transport process has not only been fully demonstrated, but also
It solves conventional filler tower to take up a large area, builds and the problems such as maintenance cost is high, solved further to explore hypergravity equipment
The problem of mass transferring in gas phase efficiency is low in industry provides new approaches.
Beneficial effects of the present invention：
1st, cross-flow bed is sheared as methanol removal equipment using Multi-stage airflow, using methanol aqueous solution as absorbent.Methanol is water-soluble
Liquid is a kind of nontoxic, tasteless, cheap and easy to get, free from environmental pollution solution, has good chemical stability and thermal stability,
It does not react under use condition, and under working temperature, the solubility of methanol in aqueous solution obeys Henry's law, with pressure
The advantages that power raising, temperature are increased and are reduced；
2nd, the structure design of liquid distribution trough standardizes the flow path of liquid in Multi-stage airflow shearing cross-flow bed, and liquid is formed
Good collection and redistribution, realize maximized filler wetting effect, make the mass transfer between gas-liquid more abundant, and due to every
Level-one gas-liquid is all cross-flow, and treating capacity is big, and on the whole for gas-liquid in adverse current, mass-transfer efficiency and degree of purification are high；
3rd, methanol aqueous solution absorption methanol belongs to gas-film controlled.Using Multi-stage airflow shearing cross-flow bed as removing equipment, improve
Gas film mass transfer coefficient, increases the effective contact area of gas-liquid two-phase, and gas-liquid two-phase is made faster to have reached and is uniformly mixed；It inhales
The internal circulating load for receiving liquid is reduced, while equipment volume significantly reduces, and can reduce construction and operating cost.
4th, the rotating speed of Multi-stage airflow shearing cross-flow bed rotor can be adjusted in a wider scope using frequency converter, flexibly effectively
Ground increases gas treatment amount and efficiency, can be further energy-saving.
5th, the technological process is simple, and floor space is small, and circulating fluid volume is few, and equipment investment is few；Driving and parking is convenient, it is only necessary to rather
The entire technological process of clock can stable operation.
Description of the drawings
Fig. 1 is the structure diagram that Multi-stage airflow shears cross-flow bed and liquid distribution trough.
Fig. 2 is along the sectional view of line A-A in Fig. 1.
Fig. 3 is along the sectional view of line B-B in Fig. 1.
Fig. 4 is along the sectional view of line C-C in Fig. 1.
Fig. 5 is the process schematic representation of present invention methanol removal from methyl tertiary butyl ether(MTBE) pyrolysis product.
In figure：1- gas feeds；2- filler rotors；3- lower floors liquid distribution trough；4- filler stators；5- diversion pipes；
6- collecting tanks；7- inner cylinders；8- supernatant liquid distributors；9- filler stators；10- gas vents；11- liquid-inlets；
12- liquid outlets；13- ring sleeves；14- reaction product coolers；15- valves；16- Multi-stage airflows shear cross-flow bed；
17- motors；18- methanol rich solution slots；19- lean pumps；20- lean liquid tanks；21- flowmeters；22- aerogenesis surge tanks.
Specific embodiment
It is further illustrated the present invention below by embodiment, but is not limited to following embodiment.
Embodiment 1：
As shown in Fig. 1 ~ 5, the device of methanol removal in a kind of pyrolysis product from methyl tertiary butyl ether(MTBE) is sheared wrong including Multi-stage airflow
Fluidized bed 16,16 side bottom of Multi-stage airflow shearing cross-flow bed are equipped with gas feed 1, are passed through cracked gas, Multi-stage airflow shearing cross-flow
16 top of bed is equipped with gas vent 10, and workshop section is connected with purified gas, and Multi-stage airflow shearing cross-flow bed side roof part is equipped with liquid-inlet
11, for being passed through absorbing liquid, the bottom of Multi-stage airflow shearing cross-flow bed 16 is equipped with liquid outlet 12, for discharging absorbing liquid, liquid
Body import is connected with pump, and the liquid outlet 11 of Multi-stage airflow shearing cross-flow bed is then connected with methanol rich solution slot 18；
The Multi-stage airflow shearing cross-flow bed 16 is fixed with redistributor, filler rotor, filler including liquid distribution trough, liquid collection
Son, driving motor, negative pulley wheel and shell；Filler rotor 2 replaces installation, same from top to bottom with filler stator 4 in the equipment
Axis is set, and is risen with filler stator, with filler rotor end, filler rotor 2 is provided centrally with liquid distribution trough, liquid distribution trough and liquid
Body import 11 connects；Filler stator 4 is connected with revolving bed housing, and filler rotor 2 is connect with shaft, the passive belt of shaft lower end
Wheel is connected with driving motor 17；
The liquid distribution trough includes ring sleeve 13, collecting tank 6, diversion pipe 5, and liquid distribution trough includes at least two, this reality
It applies example and includes supernatant liquid distributor 8 and lower floor's liquid distribution trough 3, the ring sleeve 13 is made of two coaxial sleeves,
Ring sleeve 13 is placed on the outside of shaft, is filler rotor 2 on the outside of liquid distribution trough, is uniformly provided on the outer tube wall of ring sleeve 13
Several holes；Collecting tank 6 is located at the bottom outside of this layer of filler rotor 2, connects with revolving bed inner walls, collecting tank 6 is by leading
Flow tube 5 is communicated with lower floor liquid distribution trough 3；Filler rotor of the liquid through rotation that supernatant liquid distributor 8 sprays repeatedly disperses
After coalescence, collect eddy flow through housing and enter in collecting tank 6, flowing to lower floor's liquid distribution trough 3 along diversion pipe 5 sprays.
In above device, the liquid distribution trough is placed between shaft and filler rotor, and ring sleeve 13 is passed through and filled out
Anticipate son 4 and fixed with filler stator 4 with welding manner, prevent gas short-circuit, be uniformly provided on the outer tube wall of ring sleeve 13
Several holes, liquid, which is sprayed along the hole across filler rotor, to be entered in collecting tank 6；The hole is round hole or grate opening；The number in hole
Mesh is determined by fluid flow and flow velocity.
In above device, the collecting tank 6 is circular ring shape, and section is U-shaped, by annular sheet, inner cylinder 7, rotation
The U-lag of bed inner walls composition, collecting tank 6 are located at revolving bed case inside, and annular sheet is perpendicular to inner walls and passes through
Welding manner is installed, for collecting liquid；The inner cylinder is parallel to housing and same center, is welded as a whole with annular sheet.
In above device, the diversion pipe 5 is pipe, and diameter is determined by fluid flow, and flow control is in 0.01-
1m/s；Its bottom is connected with lower floor liquid distribution trough 3；Diversion pipe 5 is with welding manner and collecting tank 6 and next layer of liquid distribution
Device is connected；
Diversion pipe is equipped with 3 in the present embodiment, along the circumferential direction uniformly sets obliquely, and several diversion pipes form pyramidal structure.
In above device, the inner cylinder height is determined by absorption flow quantity, collects the amount of liquid no more than the circle
The height of cylinder.
As shown in figure 5, the gas feed 1 of methyl tertiary butyl ether(MTBE) MTBE pyrolysis products from Multi-stage airflow shearing cross-flow bed 16 is logical
Enter, gas vent 10 is connected with purified gas workshop section, absorbing liquid pass through Multi-stage airflow shear after the liquid-inlet 11 of cross-flow bed 16 from
Liquid outlet 12 is discharged, and the liquid-inlet 11 of Multi-stage airflow shearing cross-flow bed 16 is connected with lean pump 19, and Multi-stage airflow shearing is wrong
The liquid outlet 12 of fluidized bed 16 is then connected with methanol rich solution slot 18.
What the present invention selected is Multi-stage airflow shearing cross-flow bed, and type and the material for rotating filler are unrestricted.
Concrete operation step is as follows：Motor 17 is opened, 16 rotor of Multi-stage airflow shearing cross-flow bed is adjusted to suitable rotational speed, opens
Lean pump 19 is opened, the control of fluid flowmeter 21 is adjusted and absorbs flow quantity, absorbing liquid enters Multi-stage airflow from liquid-inlet 11 and shears
Cross-flow bed 16, liquid are uniformly distributed penetrating two layers of filler up and down through liquid distribution trough, along filler under huge centrifugal force effect
Internal layer moves outward, and MTBE pyrolysis products are passed through Multi-stage airflow shearing cross-flow bed 16 by gas feed 1, by lower floor's rotary filling
Swirling eddy is formed after material, upper strata packing area is then entered by the redistribution of static filler gas body, gas-liquid two-phase is with cross-flow side
Formula is vigorously mixed again, and in the process, liquid is torn into millimeter to the brin, drop and liquid film of Nano grade, and with very
Fast interface renewal speed completes the absorption of methanol.Gas after absorption enters purification section through gas vent 10, after absorption
Absorbing liquid through liquid outlet 12 outflow be passed through methanol rich solution slot 18.The methanol liquid of rich solution slot enters destilling tower and is recovered profit
With.Gas feed 1 and gas vent 10 are worked off one's feeling vent one's spleen simultaneously equipped with gas analysis arrangement using gas chromatography-mass spectrometry analysis
The content of methanol in body.
Embodiment one：
MTBE pyrolysis products form（Mass fraction）：Isobutene：97.4%；Methanol：1.44%；Dimethyl ether：1.13%；Remaining is micro-
Amount MTBE and uncle determine alcohol.
Motor is opened, Multi-stage airflow is adjusted and shears cross-flow bed rotor to 1800r/min, open lean pump, adjust liquid flow
Gauge controls water-soluble agent flux as 30L/h, and methanol aqueous solution enters Multi-stage airflow shearing cross-flow bed from liquid-inlet, will contain
The MTBE pyrolysis products of 1.44% methanol are passed through Multi-stage airflow shearing cross-flow bed by gas feed, and adjusting tolerance is 3m3/ h, liquid
Be uniformly distributed penetrating two layers of filler up and down through upper and lower two liquid distribution troughs, under huge centrifugal force effect along filler internal layer to
Movement outside, the MTBE pyrolysis products containing methanol are contacted with absorbing liquid in filler with cross-flow, and methanol removal gas goes out from gas
The purification gas of mouth out is passed through purification section, and the methanol aqueous solution for absorbing methanol is discharged into rich solution slot from liquid outlet.It adopts
With the content of methanol gas in gas chromatography-mass spectrometry analysis Multi-stage airflow shearing cross-flow exit gas, exit gas is measured
Methanol content is 4.3 × 10-6。
Embodiment two：
Technological process is with example one, and the factor that example two is investigated is different gas flow, fluid flow, rotor speed, and analysis is more
The content of grade air-flow shearing cross-flow bed gas outlet methanol（Mass fraction）, the results are shown in Table 1.
1 result of the test of table
The content of methanol in MTBE pyrolysis products can be removed to 4.3 × 10 by the present invention-6And hereinafter, and use physics inhale
Methanol absorption liquid is nontoxic in receipts method, and cycle rich solution is also renewable, and technological process is simple.First is absorbed compared to conventional filler tower
The method of alcohol, greatly reduces occupation area of equipment, effectively reduces equipment expenditure of construction and operating cost.Multi-stage airflow shearing is wrong
Liquid distribution trough effectively increases the service efficiency of methanol absorption liquid in fluidized bed, saves energy consumption and material consumption.
Claims (7)
1. a kind of device of methanol removal in pyrolysis product from methyl tertiary butyl ether(MTBE), it is characterised in that：It is sheared including Multi-stage airflow
Cross-flow bed, Multi-stage airflow shearing cross-flow bed side bottom are equipped with gas feed, are passed through cracked gas, Multi-stage airflow shearing cross-flow bed top
Portion is equipped with gas vent, and workshop section is connected with purified gas, and Multi-stage airflow shearing cross-flow bed side roof part is equipped with liquid-inlet, for being passed through
Absorbing liquid, the bottom of Multi-stage airflow shearing cross-flow bed is equipped with liquid outlet, and for discharging absorbing liquid, liquid-inlet is connected with pump,
The liquid outlet of Multi-stage airflow shearing cross-flow bed is then connected with rich solution slot；
The Multi-stage airflow shearing cross-flow bed includes liquid distribution trough, liquid is collected and redistributor, rotor, stator, driving electricity
Machine, negative pulley wheel and shell；Filler rotor replaces installation with filler stator, is coaxially disposed from top to bottom in the equipment, to fill out
Anticipate son to rise, with filler rotor end, filler rotor center is provided with liquid distribution trough, and liquid distribution trough is connect with liquid-inlet；
Filler stator is connected with revolving bed housing, and filler rotor is connect with shaft, negative pulley wheel and the driving motor phase of shaft lower end
Even；
The liquid distribution trough includes ring sleeve, collecting tank, diversion pipe, and ring sleeve includes at least two, the annular sleeve
Pipe is made of two coaxial sleeves, and ring sleeve is placed on the outside of shaft, is filler rotor on the outside of ring sleeve, outside ring sleeve
Several holes are uniformly provided on tube wall；Collecting tank is located at the bottom outside of this layer of filler rotor, connects with revolving bed inner walls, collection
Liquid bath is communicated by diversion pipe with lower floor ring sleeve；Ring sleeve spray filler rotor of the liquid through rotation repeatedly dispersion with
After coalescence, collect eddy flow through housing and enter in collecting tank, the ring sleeve that lower floor is flowed to along diversion pipe sprays.
2. the device of methanol removal in the pyrolysis product according to claim 1 from methyl tertiary butyl ether(MTBE), it is characterised in that：Institute
The ring sleeve stated is placed between shaft and filler rotor, and ring sleeve passes through filler stator and with filler stator with the side of welding
Formula is fixed, and prevents gas short-circuit, and the outer tube of ring sleeve is uniformly provided with several holes on the wall in rotor, and liquid is sprayed along the hole
Enter in collecting tank across filler rotor；
The hole is round hole or grate opening；The number in hole is determined by fluid flow and flow velocity.
3. the device of methanol removal in the pyrolysis product according to claim 1 from methyl tertiary butyl ether(MTBE), it is characterised in that：Institute
The collecting tank stated be circular ring shape, the U-lag that section is made of annular sheet, inner cylinder, revolving bed inner walls, collecting tank
Positioned at revolving bed case inside, annular sheet is perpendicular to inner walls and is welded in inner walls, for collecting liquid；Described
Inner cylinder be with the body concentric cylinder of shell, inner cylinder bottom is welded as a whole with annular sheet.
4. the device of methanol removal in the pyrolysis product according to claim 1 from methyl tertiary butyl ether(MTBE), it is characterised in that：Institute
The diversion pipe stated is round tube, and positioned at the lower part of collecting tank, diversion pipe lower end is connected with next layer of liquid distribution trough；Water conservancy diversion
Pipe is arranged below collecting tank, is uniformly provided with 2 ~ 8, is uniformly set obliquely towards center of circle direction along collecting tank circumferencial direction, if
Dry diversion pipe forms pyramidal structure；
The diameter of the diversion pipe is determined that flow rate of liquid is controlled in 0.01-1m/s by flow rate of liquid.
5. the device of methanol removal in the pyrolysis product according to claim 1 from methyl tertiary butyl ether(MTBE), it is characterised in that：Institute
The inner cylinder height stated is determined by absorption flow quantity, collects height of the amount no more than the cylinder of liquid.
6. a kind of method of methanol removal in pyrolysis product from methyl tertiary butyl ether(MTBE), using claim 1 ~ 5 any one of them
The device of methanol removal from methyl tertiary butyl ether(MTBE) pyrolysis product, it is characterised in that：Include the following steps：
MTBE pyrolysis products and absorbing liquid are sheared into cross-flow bed cross-flow-counter current contacting by Multi-stage airflow, in high speed rotation filler
Shear action under complete methanol gas deep removal；
Liquid gas volumetric flow ratio is 1：100~300；
Multi-stage airflow shearing cross-flow bed rotor rotating speed be：100~1800r/min；
Absorbing liquid is：Methanol aqueous solution；
Absorption pressure is：0.1~2MPa；
Absorbing temperature is：40~100℃；
Methanol concentration is：＜ 30%（Mass fraction）.
7. the method for methanol removal in the pyrolysis product according to claim 6 from methyl tertiary butyl ether(MTBE), it is characterised in that：
Cracked gas is passed through from gas feed, gas is first subjected to after the high-speed rotating filler shearing of lowest level in helically mode
It rises, then by being sheared again during central rest stator, the trend that gas radially rotates is eliminated or weakens, gas turbulence
Degree increases, and the gas finally redistributed is upwardly through the high-speed rotating filler in upper strata again by high speed shear；Gas quilt
It is redistributed after multistage filler shearing, effectively reduces gas film mass transfer resistance；
Meanwhile absorbing liquid enters liquid distribution trough from liquid-inlet, is sprayed on high-speed rotating filler rotor, is sheared by rotor
It into brin, drop or liquid film, is contacted with upward gas cross-flow, gas-liquid is on the whole in counter current contacting, so as to effectively strengthen gas
Liquid mass transport process realizes the function of the multiple absorption cleaning of single device, improves the concentration for absorbing rich solution.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810059112.2A CN108159844A (en) | 2018-01-22 | 2018-01-22 | The device and method of methanol removal in a kind of pyrolysis product from methyl tertiary butyl ether(MTBE) |
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| CN201810059112.2A CN108159844A (en) | 2018-01-22 | 2018-01-22 | The device and method of methanol removal in a kind of pyrolysis product from methyl tertiary butyl ether(MTBE) |
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Application publication date: 20180615 |