CN105712831B - A kind of method of methyl tertiary butyl ether(MTBE) and the tert-butyl alcohol compound preparing isobutene - Google Patents
A kind of method of methyl tertiary butyl ether(MTBE) and the tert-butyl alcohol compound preparing isobutene Download PDFInfo
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Abstract
The invention discloses a kind of method of methyl tertiary butyl ether(MTBE) and tert-butyl alcohol compound preparing isobutene.This method contacts with catalyst A and catalyst B successively including MTBE and TBA compounds to be carried out reaction and prepares isobutene, the new catalyst of nucleocapsid different ratio is respectively adopted in catalyst A and catalyst B wherein used, core is amorphous silica-alumina, and shell is the aluminum oxide by silicon and tin modification.The inventive method realize MTBE cracking and TBA be dehydrated two kinds reaction and meanwhile carry out generation isobutene, make TBA conversion ratio and MTBE conversion ratio it is higher, the selectivity for generating isobutene is also higher.
Description
Technical field
The present invention relates to a kind of MTBE（Methyl tertiary butyl ether(MTBE)）And TBA（The tert-butyl alcohol）Compound cracking simultaneously prepares isobutene
Method.
Background technology
Isobutene is important Organic Chemicals, using its as raw material mainly for the production of methyl methacrylate (MMA),
Butyl rubber, polyisobutene, tertiary butyl phenol, tert-butylamine, methylallyl chloride, trimethylace tonitric, isoprene, p-tert-octyl phenol,
The fine chemical products such as antioxidant, agriculture medicine intermediate, tert-butyl acetate, silane.The raw material of production isobutene is mainly derived from
The by-product C-4-fraction of naphtha steam cracking ethylene unit, refinery fluid catalytic cracking（FCC）The by-product carbon four of device
By-product tert-butyl alcohol etc. in cut and the synthesis of Halcon methods expoxy propane, wherein industrial process mainly have sulfuric acid extraction,
Adsorption method of separation, tert-butyl alcohol dehydration method, methyl tertiary butyl ether(MTBE) cracking and n-butene isomerization process etc..
MTBE cracking is many to prepare advanced technology in isobutene method, a kind of method of better economy.Split in MTBE
Solve in preparing isobutene course of reaction, main reaction is under the effect of catalyst, and MTBE is cracked into isobutene and methanol, most passes through afterwards
The processes such as rectifying obtain isobutene or high-purity isobutene.The catalyst type of MTBE cracking preparing isobutenes is more, including aluminum oxide,
Silica, amorphous silica-alumina, ion exchange resin, molecular sieve, solid phosphoric acid and other acidic resin catalyst systems.Such as
MTBE disclosed in CN1853772A, CN102451674A, JP2004115407, JP2004091443, JP3220136 etc. is cracked
Preparing isobutene catalyst is amorphous silicon aluminum-based catalyst, for another example patent DE 3509292, DE 3210435, US
4447668th, GB 1482883, US 4570026, US 4551567 etc. then use ion-exchange resin catalyst catalyst, and again
Such as patent CN 96123535.7, EP 0118085, JP 7626401, JP 7494602 are with solid phosphoric acid, sulfate, activity
Charcoal is as MTBE catalyst for cracking.
Another the more universal method for producing isobutene is TBA dehydrations.The reaction of TBA dehydration preparing isobutenes has
The features such as accessory substance is few, separation and purification is easy, reduced investment.Conventional catalyst includes aluminum oxide, molecular sieve, azochlorosulfonate acid ion and exchanged
Resin etc..The isobutene dehydration catalyst as disclosed in US3665048, CN101300211A, CN102516030A etc. is oxidation
Aluminum-based catalyst.For another example it is using sulfonate resin as catalyst in US4423271, US2005/0014985A1 etc..
The catalyst for tert-butyl alcohol cracking reaction that CN103611572A and CN103506158A is provided, is prepared into by following methods
Arrive:Melt pelletization method is first passed through by polystyrene, chliorinated polyvinyl chloride, polytrifluorochloroethylene and Kynoar or poly- tribromo
It is granulated after styrene blending, melting, it is then granulated to obtain described catalyst with sulfur trioxide progress sulfonating reaction.
In production process, MTBE and TBA compounds are more often met.Its main source has two kinds.The first source is with different
Butylene can produce the TBA of more amount initial stages with the driving that methanol is waste MTBE.Because when going into operation, catalyst
Or（And）A certain amount of water may be adulterated in installing pipes, excessive isobutene is readily generated TBA with water reaction.To industry
For device, also imply that and considerable amount of MTBE and TBA product mix generation is had at the initial stage of going into operation.MTBE and TBA mixing productions
Product are separated as waste disposal, or using MTBE/TBA knockout towers, respectively obtain target product MTBE and TBA.
Second of source, and most important source are artificially to produce, i.e., coproduction TBA while MTBE is prepared.First,
It is that the special technology for producing TBA has some problems.TBA production technologies are complex, due to the intersolubility of C-4-fraction and water
It is poor, therefore TBA product designs only have 45%-55%, TBA azeotrope with water is difficult separation in addition, and conventional distillation can only obtain 85%
TBA.The TBA products of higher concentration can just be obtained by being typically employed to multitple extraction rectifying, but equipment investment and operating cost will be big
Amplitude improves.Secondly, coproduction TBA has technical advantage while preparing MTBE:（1）Scheme simple and flexible.Can be according to production
The demand of product commercially is suitably adjusted to process program.Only technological process need to simply be switched and be changed suitably
Catalyst, so that it may realize per unit area yield MTBE or TBA, and MTBE and TBA mixtures.（2）Flow is convenient to carry out, and investment risk is small.
It is convenient to carry out by being transformed per unit area yield MTBE techniques with regard to that can be easy to switch to joint production process.Simultaneously again can be easily extensive
Traditional per unit area yield technique is arrived again, and MTBE/TBA knockout towers more than needed can be used for carrying out the separation of n-butene in C-4-fraction.Cause
This, investment risk is not present in the technology.Finally, combined production device investment cost is low.If there is special per unit area yield MTBE and special in manufacturer
Per unit area yield TBA devices, the two each architectonical, mutual equipment can not borrow, therefore more than the equipment of joint production process, investment
Greatly.Combined production device can produce MTBE and TBA simultaneously, produce MTBE respectively with scale set than newly-built two sets and TBA reduces investment outlay
More than 40%, while also significantly reduce operating cost.Therefore, coproduction TBA technologies have obtained extensively while MTBE is prepared
General attention.The Lu Chunlong of Xi'an Petroleum University in its Master's thesis, " analyze and be related to just with TBA coproduction by the optimization of MTBE devices
Visit " in, just prepare MTBE while coproduction TBA technologies carried out serious analysis, obtained affirm answer.
CN200610104876.6 discloses a kind of isobutene with C-4-fraction and methanol-water coproducing methyl tertbutyl ether and tertiary fourth
The production method of alcohol.But MTBE the and TBA compound products of coproduction, main whereabouts are divided using MTBE/TBA knockout towers
From respectively obtaining target product MTBE and TBA.
Whether MTBE the and TBA compounds that the first source or second of source obtain, at this stage, compound is used
When producing isobutene, substantially then distinguished using purer MTBE raw materials and TBA raw materials is obtained after compound is separated
Distinguish preparing isobutene on MTBE crackers and TBA dehydration devices.
Carry out cracking preparing isobutene technology about MTBE and TBA compounds, at this stage or blank.One of them is important
Reason is that the requirement of MTBE crackers and TBA dehydration devices to catalyst performance is inconsistent.It is generally believed that MTBE cracking and catalyzings
The active sites on agent surface are with Bronsted acid（B acid）Based on center, and the catalyst of TBA dehydration preparing isobutenes is Lewis acid
（L acid）Catalytic reaction process.For single kind catalyst, either based on B acid or based on L acid, it is impossible to both
Take into account.Another reason, using common catalyst, both reaction conditions are different, especially reaction temperature, TBA dehydration temperature
Degree is lower compared with MTBE cracking temperatures.Therefore, how to handle MTBE simultaneously under same device same reaction conditions and TBA is mixed
Material is closed to produce isobutene, while there is higher activity and selectivity, is an important subject of this area.
The content of the invention
Isobutene is prepared as raw material using MTBE and TBA compounds in order to realize, the invention provides a kind of MTBE and TBA to mix
The method for closing material preparing isobutene.This method can not only realize MTBE and TBA simultaneous reactions generation isobutene, and MTBE and TBA
Higher conversion ratio is respectively provided with, side reaction is few, and isobutene reaches higher selectivity.
The method that the present invention prepares isobutene, using fixed-bed process, at least using the beds of two series connection, bag
Include MTBE and TBA compounds and contacted successively with catalyst A and catalyst B and carry out reaction and prepare isobutene, wherein catalysis used
Agent A contains core shell structure component, and core is amorphous silica-alumina, and shell is the aluminum oxide by silicon and tin modification, wherein by silicon and tin modification
Aluminum oxide and amorphous silica-alumina weight ratio be 1:18~1:3, preferably 1:10~1:4, by the aluminum oxide of silicon and tin modification,
Silicone content is 0.5wt%~2.0wt%, and Theil indices are 0.2wt%~1.0wt%, preferably silicone content be 0.8wt%~
1.5wt%, Theil indices are 0.3wt%~0.8wt%；Catalyst B contains core shell structure component, and core is amorphous silica-alumina, and shell is
By silicon and the aluminum oxide of tin modification, wherein being 1 by the weight ratio of the aluminum oxide and amorphous silica-alumina of silicon and tin modification:60~1:
20, preferably 1:50~1:30, by the aluminum oxide of silicon and tin modification, silicone content is 0.5wt%~2.0wt%, Theil indices are
0.2wt%~1.0wt%, preferably silicone content are 0.8wt%~1.5wt%, and Theil indices are 0.3wt%~0.8wt%.
Two beds can be seated in different reactors by the inventive method respectively, can also be seated in one
In individual reactor.
In the inventive method, catalyst A and catalyst B admission space ratio is 1:1~1:10, preferably 1:2~1:5.
In catalyst A or catalyst B of the present invention, in the amorphous silica-alumina, SiO2Content be 60.0wt%~
99.0wt%, preferably 80.0wt%~95.0wt%, preferably 87.0wt%~93.0wt%；Al2O3Content be 1.0wt%~
40.0wt%, preferably 5.0wt%~20.0wt%, preferably 7.0wt%~13.0wt%.
In catalyst A or catalyst B of the present invention, the property of the amorphous silica-alumina is as follows：Specific surface area is
240m2/ g~450m2/ g, preferably 270 m2/ g~410m2/g；Pore volume is 0.4mL/g~0.9mL/g, preferably 0.5mL/g~
0.7mL/g。
The method of MTBE and TBA compounds preparing isobutene of the present invention uses fixed-bed process.Used reaction condition is：
Volume space velocity is 0.5h during total liquid-1~10.0h-1, preferably 2.0h-1~5.0h-1；Temperature is 120 DEG C~300 DEG C, is preferably
150 DEG C~250 DEG C；Pressure is normal pressure~0.6MPa, preferably normal pressure~0.3MPa.
In the inventive method, MTBE and MTBE and TBA in TBA compounds weight ratio is 1:1~40:1 compound, it is excellent
The weight ratio for selecting MTBE and TBA is 2:1~20:1.
Catalyst A or catalyst B of the present invention can use following methods to prepare, including：By chlorosilane and stanniferousization
Siliceous and tin aluminum hydroxide slurry is obtained in the aluminum hydroxide slurry that compound is added separately to constantly stir, by above-mentioned siliceous and tin
Aluminum hydroxide slurry spray on amorphous silica-alumina, then through dry and roasting, obtain catalyst of the present invention.Art technology
Personnel adjust catalyst composition according to the above method, you can obtain catalyst A or catalyst B.
In the inventive method, by chlorosilane and sn-containing compound be added in the aluminum hydroxide slurry constantly stirred preferably with
The mode for being slowly added to or instilling.
Amorphous silica-alumina of the present invention can use method conventional in the prior art to prepare amorphous silica-alumina, such as be co-precipitated
Method, step-by-step precipitation method and mechanical mixing, the amorphous silica-alumina preferably obtained after saturated vapor is handled, wherein handling
Temperature is 150 DEG C~450 DEG C, and processing time is 5h~24h.
Amorphous silica-alumina of the present invention preferably uses the amorphous silica-alumina containing activating agent.Described activating agent is selected from the
One or more in Group IIA and group VIII metal, wherein group iia metal are preferably one kind or more in Be, Mg and Ca
Kind, group VIII metal is preferably the one or more in Ni, Pd and Pt.Using the weight of the amorphous silica-alumina containing activating agent as base
Standard, the content of activating agent oxide is 0.3wt%~2.0wt%.In the present invention, active agent component can be handled in saturated steam
Load before, can also be in the back loading of saturated steam processing, carrying method can use infusion process, and detailed process is as follows:
By amorphous silica-alumina immerse the soluble inorganic salt containing activating agent the aqueous solution in, activator solution concentration be 0.08mol/L~
2.0mol/L, it is calcined 3~8 hours through 200 DEG C~600 DEG C again after dipping.
In the inventive method, aluminum hydroxide slurry typically uses boehmite slurries.Boehmite also known as a hydration
Aluminum oxide or false boehmite, molecular formula AlOOHnH2O（N=0.08~0.62）.Aluminum hydroxide slurry is using conventional
Method prepare, including aluminium alcoholates Hydrolyze method, the acid system of aluminium salt or aluminate or alkaline process, NaA1O2Solution is passed through CO2Carbonizatin method
Deng.
The chlorosilane of the preferred facile hydrolysis of chlorosilane, can be dimethyldichlorosilane, trimethylchloro-silicane in the inventive method
One or more in alkane, phenyl chlorosilane etc..Wherein, the addition of chlorosilane（In terms of silicon）For aluminium hydroxide（With aluminum oxide
Meter）0.5wt%~2.0wt% of weight, preferably 0.8wt%~1.5wt%.
In the inventive method, the sn-containing compound of the preferred facile hydrolysis of sn-containing compound, including stannous chloride, butter of tin,
One or more in nitric acid tin, stannous sulfate, stannous octoate, dibutyl tin dichloride etc..Wherein, the addition of sn-containing compound
Amount（In terms of tin）For aluminium hydroxide（In terms of aluminum oxide）0.2wt%~1.0wt% of weight, preferably 0.3wt%~0.8wt%.
Catalyst used in the present invention is preformed catalyst, and shaping of catalyst can be in siliceous and tin aluminum hydroxide slurry
Carried out before spraying amorphous silica-alumina（For example be first molded amorphous silica-alumina, after drying and roasting, spray siliceous and tin hydrogen
Aluminum oxide slurries, then final catalyst is obtained after drying and roasting）, can also be sprayed in siliceous and tin aluminum hydroxide slurry
Carried out after amorphous silica-alumina（For example spray siliceous and tin aluminum hydroxide slurry on the amorphous silica-alumina without shaping,
Then after drying or drying and be calcined, then through shaping, dry and roasting, final catalyst is obtained）.In the inventive method,
Involved drying and roasting are typically carried out using normal condition in catalyst preparation process, such as drying condition:80 DEG C ~
1h ~ 24h, roasting condition are dried at 150 DEG C:1h ~ 24h is calcined at 400 DEG C~700 DEG C, preferably 450 DEG C~600 DEG C.
In the inventive method, shaping can use conventional forming method, for example prepare spherical, can use oil drop method, rotate
Formula comminution granulation, marumerizer method of forming etc., its geometric diameter is preferably chosen as 2.0mm-3.0mm between 1.0mm-5.0mm.This
In inventive method, in forming process, binding agent and shaping assistant can also be added, binding agent can use conventional bonding
Agent, generally small porous aluminum oxide, account for 5.0wt%~20.0wt% of final catalyst weight.Shaping assistant such as sesbania powder or first
Base cellulose, account for 1.5wt%~3.0wt% of final catalyst weight.
The inventive method is particularly suitable for completing to prepare isobutene reaction by raw material of MTBE and TBA compounds, i.e. MTBE splits
Solution preparing isobutene can be carried out simultaneously with TBA dehydration preparing isobutene reactions, is carried out grading by using two kinds of catalyst, is not only able to
Improve MTBE and TBA and change into isobutene, and the selectivity of isobutene can be improved.
The inventive method can use conventional reactor, such as using original MTBE cracking preparing isobutene devices or TBA
It is dehydrated preparing isobutene device.
In the inventive method, impurity in compound is that raw material prepares isobutene and TBA is equal to or less than conventional MTBE
The impurity contained during raw material dehydration preparing isobutene in raw material, such as methyl sec-butyl ether≤0.2wt%, methanol≤0.05wt%,
Isobutylene oligomer≤0.05 wt%, carbon four and carbon hydro carbons≤0.1wt% below four.
The present invention in catalyst process is prepared, distinguish by the chlorosilane and sn-containing compound that are added in aluminum hydroxide slurry
Hydrolysis, the activated centre of suitable TBA dehydrations, while silicon and other groups can be provided for shell aluminum oxide（Including organic
Group, acidic-group etc.）Presence have beneficial to improving the pore distribution of catalyst shell and the insertion in shell and stratum nucleare duct
Property, be advantageous to compound and react and be diffused rapidly to stratum nucleare.In addition, the acid that chlorosilane and sn-containing compound generate when hydrolyzing（Bag
Include hydrochloric acid etc.）Also slurry viscosity can be increased, make catalyst structure more uniform, nucleocapsid combines even closer.The catalyst is same
Shi Jiagong MTBE and TBA compounds prepare isobutene and provide excellent performance, and existing catalyst is unable to reach.
The present invention is by synthesizing a kind of raw catelyst, for generating the anti-of isobutene by raw material of MTBE and TBA compounds
Ying Zhong, TBA dehydrations is cracked two kinds of reactions with MTBE while carry out preparing isobutene, avoid point of MTBE and TBA compounds
From process, and avoid building MTBE crackers respectively and TBA dehydration devices produce isobutene, save operating procedure, reduce
Cost of investment, and make TBA conversion ratio and MTBE conversion ratio it is higher, the selectivity for generating isobutene is also higher.
Embodiment
In the present invention, material purity and product form use gas chromatography analysis.Specific surface area and pore volume are using low
Warm liquid nitrogen determination of adsorption method.Constituent content is determined using inorganic analysis method.In the present invention, wt% is mass fraction.
Comparative example 1
By amorphous silicon aluminium powder FM1（Wherein SiO2Content 92.1wt%, specific surface area 281m2/ g, pore volume are
0.58mL/g）It is immersed in appropriate Ni (NO3)212h in the aqueous solution, by 400 DEG C of roasting 6h, then through 300 DEG C, 6h saturated vapors
After processing, obtain containing the amorphous silicon aluminium powder FM1-1 that nickel oxide is 0.61wt%.
By aluminum hydroxide slurry LRJ1（Solid content is 21.3wt%）Spray on FM1-1, dry 4 h at 120 DEG C, 500
6h is calcined at DEG C, the small porous aluminum oxide that then addition weight accounting is 10wt% is molded as adhesive with the marumerizer method of forming
For grain size between 2.2mm-2.5 mm catalyst pellet, at 120 DEG C dry 15h, through 450 DEG C roasting 6h be catalyzed
Agent DB-1, wherein aluminium hydroxide are counted with the weight of amorphous silica-alumina ratio as 1 using aluminum oxide:10.Specific evaluation result is shown in Table 1, table
4。
Comparative example 2
Under agitation, it is sub- that nitric acid tin, octanoic acid are slowly added in the aluminum hydroxide slurry LRJ1 into comparative example 1 respectively
Tin, dimethyldichlorosilane.Obtain siliceous and tin mixed serum（LRJ1-2）, wherein nitric acid tin and stannous octoate are in terms of tin
Addition accounts for boehmite（Aluminium hydroxide）Mole of 0.38wt% in terms of alumina weight, nitric acid tin and stannous octoate
Than for 1:1；Addition of the dimethyldichlorosilane in terms of silicon accounts for 1.23wt% of the boehmite in terms of alumina weight.So
4 h are dried at 120 DEG C afterwards, roasting 6h obtains siliceous and tin alumina powder LRJ1-3 at 500 DEG C.
By the FM1-1 in comparative example 1 and LRJ1-3 with weight than 10:1 uniformly mixing, then adding weight accounting is
10wt% small porous aluminum oxide is shaped to grain size between 2.2mm-2.5 mm as adhesive with the marumerizer method of forming
Catalyst pellet, 4h is dried at 120 DEG C, catalyst DB-2 is obtained through 400 DEG C of roasting 16h.Specific evaluation result is shown in Table 1, table
4。
Comparative example 3
Aluminum hydroxide slurry LRJ1 in comparative example 1 is dried into 4 h at 120 DEG C, 6h is calcined at 500 DEG C, then adds
Weight accounting be 10wt% small porous aluminum oxide as adhesive, grain size is shaped in 2.2mm- with the marumerizer method of forming
Catalyst pellet between 2.5 mm, 4h is dried at 120 DEG C, catalyst DB-3 is obtained through 400 DEG C of roasting 16h.Specific evaluation knot
Fruit is shown in Table 2.
Comparative example 4
The siliceous and tin alumina powder LRJ1-3 that comparative example 2 is obtained, add the aperture that weight accounting is 10wt% and aoxidize
Aluminium is shaped to grain size catalyst pellet between 2.2mm-2.5 mm, 120 as adhesive with the marumerizer method of forming
4h is dried at DEG C, catalyst DB-4 is obtained through 400 DEG C of roasting 6h.Specific evaluation result is shown in Table 2.
Comparative example 5
Amorphous silicon aluminium powder FM1-1 in comparative example 1 is added into small porous aluminum oxide of the weight accounting for 10wt% as bonding
Agent, grain size catalyst pellet between 2.2mm-2.5 mm is shaped to the marumerizer method of forming, dried at 120 DEG C
4h, catalyst DB-5 is obtained through 450 DEG C of roasting 12h, its MTBE cracking evaluation result is shown in Table 3.
Embodiment 1
The aluminum hydroxide slurry LRJ1-2 of stanniferous and silicon in comparative example 2 is sprayed to the amorphous silica-alumina in comparative example 1
On powder FM1-1,4h is then dried at 120 DEG C, 6h is calcined at 500 DEG C.Then the aperture oxygen that weight accounting is 10wt% is added
Change aluminium as adhesive, grain size catalyst pellet between 2.2mm-2.5 mm is shaped to the marumerizer method of forming,
4h is dried at 120 DEG C, catalyst SL-1 is obtained through 400 DEG C of roasting 6h, wherein by silicon and the aluminum oxide and amorphous silicon of tin modification
The weight ratio of aluminium is 1:10.Specific evaluation result is shown in Table 1.
Embodiment 2
Under agitation, to aluminum hydroxide slurry LRJ2（Solid content 31.2wt%）It is middle be slowly added respectively butter of tin,
Trim,ethylchlorosilane.Obtain siliceous and tin mixed serum（LRJ2-2）, wherein addition of the butter of tin in terms of tin account for intend it is thin
0.65wt% of the diaspore in terms of alumina weight；Addition of the trim,ethylchlorosilane in terms of silicon accounts for boehmite to aoxidize
The 0.85wt% of aluminium weight meter.This slurries is sprayed on the amorphous silicon aluminium powder FM1-1 in comparative example 1, then at 90 DEG C
Lower dry 8h, 3h is calcined at 600 DEG C.Then the Methyl cellulose of small porous aluminum oxide and 2.0wt% that weight accounting is 7.5wt% is added
Element is shaped to grain size with the marumerizer method of forming and urged between 2.6mm-2.9 mm respectively as adhesive and shaping assistant
Agent bead, 8h is dried at 90 DEG C, catalyst SL-2 is obtained through 650 DEG C of roasting 3h, wherein by silicon and the aluminum oxide of tin modification
Weight ratio with amorphous silica-alumina is 1:20.Specific evaluation result is shown in Table 1.
Embodiment 3
By amorphous silicon aluminium powder FM2（Wherein SiO2Content 82.2wt%, Al2O3Content is 17.8wt%；Specific surface area is
335m2/ g, pore volume 0.78mL/g）After 200 DEG C, the processing of 16h saturated vapors, appropriate Be (NO are immersed in3)2The aqueous solution
（Solution concentration is 1.50mol/L）In, it must contain the amorphous silicon aluminium powder that beryllium oxide is 1.02wt% by 500 DEG C of roasting 5h
FM2-1.The mixed serum LRJ1-2 of stanniferous and silicon in comparative example 2 is sprayed on amorphous silicon aluminium powder FM2-1, Ran Hou
1.5h is dried at 150 DEG C, 4h is calcined at 650 DEG C.Then small porous aluminum oxide that weight accounting is 18wt% is added as adhesive,
Grain size catalyst pellet between 2.2mm-2.5 mm is shaped to the marumerizer method of forming, 4h, warp are dried at 120 DEG C
400 DEG C of roasting 6h obtain catalyst SL-3, wherein being 1 by the weight ratio of the aluminum oxide and amorphous silica-alumina of silicon and tin modification:25.
Specific evaluation result is shown in Table 1.
Embodiment 4
The mixed serum LRJ2-2 of stanniferous and silicon in embodiment 2 is sprayed to the amorphous silicon aluminium powder in embodiment 3
On FM2-1,10h is then dried at 80 DEG C, 6h is calcined at 500 DEG C.Then the small porous aluminum oxide that weight accounting is 5wt% is added
And 3.0wt% sesbania powder is shaped to grain size with the marumerizer method of forming and existed respectively as adhesive and shaping assistant
Catalyst pellet between 2.4mm-2.7 mm, 4h is dried at 120 DEG C, catalyst SL-4 is obtained through 700 DEG C of roasting 6h, wherein by
The weight ratio of the aluminum oxide and amorphous silica-alumina of silicon and tin modification is 1:5.Specific evaluation result is shown in Table 1.
Embodiment 5
Under agitation, butter of tin, front three are slowly added respectively in the aluminum hydroxide slurry LRJ2 into embodiment 2
Base chlorosilane.Obtain siliceous and tin mixed serum（LRJ2-2）, wherein addition of the butter of tin in terms of tin, which accounts for, intends thin water aluminium
0.65wt% of the stone in terms of alumina weight；Addition of the trim,ethylchlorosilane in terms of silicon accounts for boehmite with aluminum oxide weight
The 0.85wt% of gauge.This slurries is sprayed on the amorphous silicon aluminium powder FM1-1 in comparative example 1, then done at 90 DEG C
Dry 8h, 3h is calcined at 600 DEG C.Then adhesive and shaping assistant are added, grain size is shaped to the marumerizer method of forming and existed
Catalyst pellet between 2.6mm-2.9 mm, 8h is dried at 90 DEG C, catalyst SL-5 is obtained through 550 DEG C of roasting 3h, wherein by
The weight ratio of the aluminum oxide and amorphous silica-alumina of silicon and tin modification is 1:8.Specific evaluation result is shown in Table 1, table 2, table 4.
Embodiment 6
Under agitation, stannous octoate, diformazan are slowly added respectively in the aluminum hydroxide slurry LRJ2 into embodiment 2
Base dichlorosilane.Obtain siliceous and tin mixed serum（LRJ2-2）, wherein addition of the butter of tin in terms of tin, which accounts for, intends thin water
0.65wt% of the aluminium stone in terms of alumina weight；Addition of the trim,ethylchlorosilane in terms of silicon accounts for boehmite with aluminum oxide
The 0.85wt% of weight meter.This slurries is sprayed on the amorphous silicon aluminium powder FM1-1 in comparative example 1, then at 90 DEG C
8h is dried, 3h is calcined at 600 DEG C.Then adhesive and shaping assistant are added, grain size is shaped to the marumerizer method of forming
The catalyst pellet between 2.6mm-2.9 mm, 8h is dried at 90 DEG C, catalyst SL-6 is obtained through 550 DEG C of roasting 3h, wherein
Weight ratio by the aluminum oxide and amorphous silica-alumina of silicon and tin modification is 1:40.Specific evaluation result is shown in Table 1, table 2, table 4.
The comparative example 1-2 of table 1 and embodiment 1-6 prepared catalysts fixed-bed process evaluation result
| Grading 1 | Grading 2 | Grading 3 | Grading 4 | Grading 5 | Grading 6 | Grading 7 | Grading 8 | |
| Catalyst A | SL-1 | DB-2 | SL-1 | SL-1 | SL-5 | SL-5 | SL-4 | SL-4 |
| Catalyst B | DB-1 | SL-2 | SL-2 | SL-6 | SL-3 | SL-2 | SL-6 | SL-3 |
| Catalyst A and catalyst B volume ratios | 1:3 | 1:3 | 1:3 | 1:3 | 1:2 | 1:4 | 1:1 | 1:10 |
| Volume space velocity during total liquid, h-1 | 2.5 | 2.5 | 2.5 | 3.0 | 5.0 | 3.0 | 3.0 | 2.0 |
| Volume space velocity during MTBE liquid, h-1 | 1.8 | 1.8 | 1.8 | 2.0 | 3.0 | 2.0 | 2.0 | 1.5 |
| Volume space velocity during TBA liquid, h-1 | 0.7 | 0.7 | 0.7 | 1.0 | 2.0 | 1.0 | 1.0 | 0.5 |
| Reaction temperature, DEG C | 210 | 210 | 210 | 210 | 250 | 210 | 210 | 155 |
| Reaction pressure, MPa | 0.05 | 0.05 | 0.05 | 0.05 | 0.30 | 0.05 | 0.05 | Normal pressure |
| MTBE conversion ratios, wt% | 96.5 | 98.3 | 99.2 | 99.3 | 99.6 | 99.7 | 99.8 | 97.6 |
| TBA conversion ratios, wt% | 91.3 | 92.1 | 99.6 | 99.5 | 99.5 | 99.5 | 99.8 | 99.2 |
| Selective isobutene, wt% | 98.7 | 99.0 | 99.8 | 99.8 | 99.9 | 99.8 | 99.9 | 99.6 |
As can be seen from Table 1, grading is carried out using the new nucleocapsid catalyst of two kinds of different compositions, by both organically
Coordinate, MTBE cracking can be achieved under the conditions of fixed-bed process and TBA is dehydrated two kinds of reactions and carries out generation isobutene reaction simultaneously
Process, and MTBE and TBA high conversion rates, selective isobutene are high.
The only catalyst using unmodified aluminum oxide as shell, itself MTBE and TBA conversion ratio is not high, the selection of isobutene
Property is also poor；Even if modified activated aluminum oxide and amorphous silica-alumina are mixed to prepare catalyst, although MTBE and TBA conversion
Rate, selective isobutene increase, but still undesirable.
The comparative example 3-4 of table 2, the TBA cracking fixed bed appreciation conditions of embodiment 5,6 and result
| Comparative example 3 | Comparative example 3 | Comparative example 4 | Comparative example 4 | Embodiment 5 | Embodiment 6 | |
| Catalyst | DB-3 | DB-3 | DB-4 | DB-4 | SL-5 | SL-6 |
| Volume space velocity during TBA liquid, h-1 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 |
| Reaction temperature, DEG C | 265 | 210 | 265 | 210 | 210 | 210 |
| Reaction pressure, MPa | 0.05 | 0.05 | 0.05 | 0.05 | 0.05 | 0.05 |
| TBA conversion ratios, wt% | 97.2 | 91.8 | 98.5 | 93.4 | 97.8 | 98.2 |
| The selectivity of isobutene, wt% | 92.5 | 93.5 | 84.3 | 83.8 | 98.8 | 99.7 |
As can be seen from Table 2, when activated alumina catalyst is used for TBA cracking, catalytic when reaction temperature is 265 DEG C
Catalytic performance when can be 210 DEG C significantly better than reaction temperature.Further, the aluminium oxide catalyst after tin, Si modification is used for
During TBA cracking reactions, TBA conversion ratio is improved, but selectivity is undesirable.
The MTBE cracking fixed bed appreciation conditions and result of the comparative example 5 of table 3
| Comparative example 5 | Comparative example 5 | |
| Catalyst | DB-5 | DB-5 |
| Volume space velocity during MTBE liquid, h-1 | 2.5 | 2.0 |
| Volume space velocity during aqueous, h-1 | 0.1 | 0.1 |
| Reaction temperature, DEG C | 230 | 210 |
| Reaction pressure, MPa | Normal pressure | 0.05 |
| MTBE conversion ratios, wt% | 99.6 | 98.2 |
| The selectivity of isobutene, wt% | 99.2 | 99.3 |
As can be seen from Table 3, when amorphous silicon Al catalysts are used for MTBE cracking, catalysis when reaction temperature is 230 DEG C
Performance is significantly better than catalytic performance when reaction temperature is 210 DEG C.
The evaluation result of the embodiment 5,6 of table 4
| Catalyst | SL-5 | SL-6 |
| Volume space velocity during total liquid, h-1 | 3.0 | 3.0 |
| Volume space velocity during MTBE liquid, h-1 | 2.0 | 2.0 |
| Volume space velocity during TBA liquid, h-1 | 1.0 | 1.0 |
| Reaction temperature, DEG C | 210 | 210 |
| Reaction pressure, MPa | 0.05 | 0.05 |
| MTBE conversion ratios, wt% | 99.4 | 99.8 |
| TBA conversion ratios, wt% | 99.8 | 98.3 |
| Selective isobutene, wt% | 99.5 | 99.6 |
As can be seen from Table 4, do not use catalyst grade to match somebody with somebody, MTBE and TBA compounds are individually carried out using a kind of catalyst
Isobutene reaction is prepared, does not reach the effect after 1 grading of the present invention of table.
Claims (15)
1. a kind of method that MTBE and TBA compounds prepare isobutene, including MTBE and TBA compounds successively with catalyst A and
Catalyst B contacts carry out reaction and prepare isobutene, wherein catalyst A used contains core shell structure component, core is amorphous silicon
Aluminium, shell are the aluminum oxide by silicon and tin modification, wherein being 1 by the weight ratio of the aluminum oxide and amorphous silica-alumina of silicon and tin modification:
18~1:3, by the aluminum oxide of silicon and tin modification, silicone content is 0.5wt%~2.0wt%, Theil indices be 0.2wt%~
1.0wt%；Catalyst B contains core shell structure component, and core is amorphous silica-alumina, and shell is the aluminum oxide by silicon and tin modification, wherein
Weight ratio by the aluminum oxide and amorphous silica-alumina of silicon and tin modification is 1:60~1:20, by the aluminum oxide of silicon and tin modification,
Silicone content is 0.5wt%~2.0wt%, and Theil indices are 0.2wt%~1.0wt%.
2. in accordance with the method for claim 1, it is characterised in that：Catalyst A and catalyst B admission space ratio is 1:2~
1:10。
3. in accordance with the method for claim 2, it is characterised in that：Catalyst A and catalyst B admission space ratio is 1:3~
1:5。
4. in accordance with the method for claim 1, it is characterised in that：In catalyst A, by the aluminum oxide of silicon and tin modification and without fixed
The weight ratio of shape sial is 1:10~1:4；In catalyst B, by the weight ratio of the aluminum oxide and amorphous silica-alumina of silicon and tin modification
For 1:30~1:50.
5. in accordance with the method for claim 1, it is characterised in that：In catalyst A or catalyst B, by silicon and the oxygen of tin modification
Change in aluminium, silicone content is 0.8wt%~1.5wt%, and Theil indices are 0.3wt%~0.8wt%.
6. in accordance with the method for claim 1, it is characterised in that：In catalyst A or catalyst B, described amorphous silica-alumina
In, SiO2Content is 60.0wt%~99.0wt%, Al2O3Content is 1.0wt%~40.0wt%.
7. in accordance with the method for claim 6, it is characterised in that：In catalyst A or catalyst B, described amorphous silica-alumina
In, SiO2Content is 80.0wt%~95.0wt%, Al2O3Content is 5.0wt%~20.0wt%.
8. in accordance with the method for claim 1, it is characterised in that：In catalyst A or catalyst B, described amorphous silica-alumina
Property it is as follows:Specific surface area is 240m2/ g~450m2/ g, pore volume are 0.4mL/g~0.9mL/g.
9. according to the method described in claim 1 or 8, it is characterised in that：In catalyst A or catalyst B, described amorphous silicon
Aluminium is obtained after hydrothermal treatment, and wherein hydrothermal conditions are：Temperature is 150 DEG C~450 DEG C, and the time is 5h~24h.
10. according to the method described in claim 1,6,7 or 8, it is characterised in that：In catalyst A or catalyst B, described nothing
Amorphous silicon-alumina is the amorphous silica-alumina containing activating agent, wherein one kind in group iia and group VIII metal of activating agent or
A variety of, wherein group iia metal is the one or more in Be, Mg and Ca, and group VIII metal is one kind in Ni, Pd and Pt
Or it is a variety of, on the basis of the weight of the amorphous silica-alumina containing activating agent, activating agent using the content that oxide is counted as 0.3wt%~
2.0wt%。
11. in accordance with the method for claim 1, it is characterised in that：Using fixed-bed process, used reaction condition is：
Volume space velocity is 0.5h during total liquid-1~10.0h-1, temperature is 120 DEG C~300 DEG C, and pressure is normal pressure~0.6MPa.
12. in accordance with the method for claim 11, it is characterised in that：Using fixed-bed process, used reaction condition is：
Volume space velocity is 2.0h during total liquid-1~5.0h-1, temperature is 150 DEG C~250 DEG C；Pressure is normal pressure~0.3MPa.
13. in accordance with the method for claim 1, it is characterised in that：In MTBE and TBA compound, MTBE and TBA weight
Than for 1:1~40:1.
14. in accordance with the method for claim 1, it is characterised in that：In MTBE and TBA compound, MTBE and TBA weight
Than for 2:1~20:1.
15. in accordance with the method for claim 1, it is characterised in that：In MTBE and TBA compound, methyl sec-butyl ether≤
0.2wt%, methanol≤0.05wt%, isobutylene oligomer≤0.05 wt%, carbon four and carbon hydro carbons≤0.1wt% below four.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5880324A (en) * | 1994-01-21 | 1999-03-09 | Intevep, S.A. | Catalyst for use in the dehydrogenation and isomerization of paraffins and method |
| CN1853772A (en) * | 2005-04-27 | 2006-11-01 | 中国石油化工股份有限公司 | Catalyst in preparation of isobutene by methyl tertbutyl ether pyrolysis |
| CN101134699A (en) * | 2006-08-29 | 2008-03-05 | 奥克森诺奥勒芬化学股份有限公司 | Method for the production of iso-olefines |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5880324A (en) * | 1994-01-21 | 1999-03-09 | Intevep, S.A. | Catalyst for use in the dehydrogenation and isomerization of paraffins and method |
| CN1853772A (en) * | 2005-04-27 | 2006-11-01 | 中国石油化工股份有限公司 | Catalyst in preparation of isobutene by methyl tertbutyl ether pyrolysis |
| CN101134699A (en) * | 2006-08-29 | 2008-03-05 | 奥克森诺奥勒芬化学股份有限公司 | Method for the production of iso-olefines |
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