CN1927783A - Method of preparing propylene by catalytic cracking - Google Patents

Method of preparing propylene by catalytic cracking Download PDF

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Publication number
CN1927783A
CN1927783A CNA2005100294684A CN200510029468A CN1927783A CN 1927783 A CN1927783 A CN 1927783A CN A2005100294684 A CNA2005100294684 A CN A2005100294684A CN 200510029468 A CN200510029468 A CN 200510029468A CN 1927783 A CN1927783 A CN 1927783A
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propylene
carbon
catalytic cracking
raw material
reaction
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CN100413823C (en
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谢在库
刘俊涛
钟思青
孙凤侠
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China Petroleum and Chemical Corp
Sinopec Shanghai Research Institute of Petrochemical Technology
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China Petroleum and Chemical Corp
Sinopec Shanghai Research Institute of Petrochemical Technology
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y02P20/584—Recycling of catalysts

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Abstract

The present invention relates to catalytically cracking process to produce propylene, and the process is superior to available technology and has high propylene selectivity, high and stable product yield and no need of frequent regeneration of the catalyst. The technological scheme of the present invention is that in a fluidized bed reactor, the rich olefin mixture material containing one or several C4 and C4+ olefins is made to contact with mesoporous aluminum silicon phosphate molecular sieve with 0.6-0.65 nm pores in the presence of water vapor to produce effluent containing propylene. The process may be used in industrial production for producing propylene.

Description

The method of catalytic cracking for producing propylene using
Technical field
The present invention relates to a kind of method of catalytic cracking for producing propylene using, is raw material about adopting carbon four and above alkene thereof particularly, uses the fluid bed reactor catalysis cracking to produce the method for propylene.
Background technology
Propylene is the most important basic organic that is only second to ethene, and in the last few years, because the quick growth of acryloyl derivative demand, the whole world faced the propylene shortage problem, on the other hand, in the world wide, the appreciable C of quantity is arranged 4And C 4Above olefin feedstock.Be subjected to the influence of factors such as the variation in Chemicals market and transportation cost, it is a kind of approach that utilizes preferably that these raw materials are carried out deep processing on the spot.C wherein 4And above conversion of olefines is that propylene is a kind of promising technology.This technology can be utilized the lower C of superfluous relatively added value on the one hand 4And C 4Above olefin feedstock can obtain broad-spectrum propylene product again on the other hand, and the ethene of by-product makes this technology more attractive simultaneously.
Disclosing a kind of employing among the document CN1490287A is raw material with carbon containing four or carbon pentaene hydrocarbon mixture, in fixed-bed reactor, adopts 350 ℃～500 ℃ temperature, the pressure of 0.6～1.0MPa and 1～10 hour -1Carry out the method for prepared in reaction ethene and propylene under the condition of weight space velocity.This method introduces the modification and the reaction result thereof of dissimilar catalyzer, and reaction raw materials is primarily aimed at carbon four and carbon Wuyuan material, and do not comprise the cracking situation of carbon five above alkene, there are problems such as life of catalyst yield short and the purpose product is lower in the fixed-bed reactor of document employing simultaneously.
The patent WO 0026163 of Equistar company is to contain weight 60%C at least 4, C 5Alkene is raw material, adopts central hole zeolite catalyst, the kind of its zeolite has, and the zeolite of one-dimensional channels is as ZSM-23, AlPO 4-11 wait its aperture greater than 3.5 , and pore size index is 14～28; Also can be the zeolite in intersection duct: greater than 3.5 , pore size index be that 14～28, the second duct pore size index is less than 20 as its apertures, first duct such as ZSM-57, AlPO4-18.This catalyzer can be Na type, H type etc., also can add oxidized metal such as the Pt and the Pd etc. of trace, removes carbon distribution when being beneficial to catalyst regeneration.The general fixed-bed process that adopts.Its temperature of reaction is 200～750 ℃, and reaction pressure is 0.05～1MPa, and weight hourly space velocity is 0.5～1000 hour -1The fixed-bed process that same this patent provides faces the catalyst carbon deposition inactivation equally, the less stable of catalyzer, and the ethylene, propylene yield is undesirable.
LURGI has announced the Propylur technology of its carbon four and above alkene increased low carbon olefine output thereof, and this technology is under low pressure, high temperature, catalyzer existence and adiabatic reaction conditions, C 4To C 7Conversion of olefines be propylene, a technology of by-product ethene and pyrolysis gasoline simultaneously.Experiment is 1.6 hours at reaction velocity in the middle of it -1Reactor inlet temperatures is 480 ℃; Reactor pressure is 0.2MPa; The reactor outlet temperature is 440 ℃, pressure 0.19MPa; Water and C 4Mol ratio be condition under to react at 7.26: 1.This technology faces the ethylene, propylene yield equally and advances the products distribution instability with the reaction times, needs the problem of frequent regeneration.
Summary of the invention
Technical problem to be solved by this invention is to exist catalyst activity stability requirement height in the technical literature in the past, purpose product propylene selectivity is low and yield is low, and adopt the narrower problem of the raw material scope of application, a kind of method of new catalytic cracking for producing propylene using is provided.It is wide that this method has the raw material scope of application, the technological merit that purpose product propylene selectivity is good, yield is high.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is as follows: a kind of method of catalytic cracking for producing propylene using, with the rich olefins mixture that contains one or more carbon four or above alkene is raw material, in fluidized-bed reactor, making the rich olefins raw material is that the mesopore silicoaluminophosphamolecular molecular sieves catalyzer of 0.6～0.65 nanometer contacts with the aperture in the presence of water vapour, generates the effluent that contains propylene.
The rich olefins mixture material of one or more carbon four or above alkene is from carbon four and above cut or alpha-olefin coproduction, MTO (methanol-to-olefins) and the carbon four of MTP by-products such as (preparing propylene from methanol) and the above olefin fraction thereof of steam cracking device in plant catalytic cracker, the ethylene plant in the technique scheme.Rich olefins mixture preferable range is C 4～C 12Normal olefine.The preferred operations condition of fluidized-bed reactor is as follows: temperature of reaction is 400～650 ℃, and weight space velocity is 0.1～50 hour -1, reaction pressure is 0～0.5MPa, the alkene weight ratio in water vapour and the rich olefins raw material is 0～5: 1.The more preferably operational condition of fluidized-bed reactor is as follows: temperature of reaction is 450～550 ℃, and weight space velocity is 1～15 hour -1, reaction pressure is 0.02～0.15MPa, the weight ratio of the alkene in water vapour and the rich olefins raw material is 0.5～2: 1.Mesopore silicoaluminophosphamolecular molecular sieves preferred version is for being selected from the SAPO-11 molecular sieve catalyst.
Among the present invention because carbon four and above olefins by catalytic cracking propylene enhancing process thereof are fast responses, promptly mainly be subjected to thermodynamic control but not kinetic control, the characteristics of olefin cracking are that numerous parallel consecutive reaction coexistences, easy carbon distribution and cracked overall thermal effect are generally endothermic process simultaneously.Based on this, can control the duration of contact of reactant and catalyzer on the one hand flexibly by adopting fluidized-bed reactor, effectively suppress the generation of secondary side reaction, the catalyzer cyclic regeneration in time of simultaneously certain carbon distribution, the purpose that product propylene selectivity is good, yield is higher that achieves the goal, and products distribution is steady.It is catalyzer that the present invention selects the mesopore silicoaluminophosphamolecular molecular sieves for use, and main consideration is because of its ideal pore passage structure and good hydrothermal stability, so that finally reach the purpose of maximization propene yield and operation steady in a long-term.
The present invention is a catalyzer with the SAP0-11 molecular sieve, uses fluidized-bed reactor, and in operational condition: temperature of reaction is 400～650 ℃, and weight space velocity is 0.1～50 hour -1, reaction pressure is 0～0.5MPa, and the alkene weight ratio in water vapour and the rich olefins raw material is under 0～5: 1 the condition, carbon four and above alkene thereof to be carried out catalytic cracking for producing propylene using, and its propene yield can reach 35%, has obtained better technical effect.
The invention will be further elaborated below by embodiment, but be not limited only to present embodiment.
Embodiment
[embodiment 1]
With the mixed c 4 that derives from FCC is that raw material (component distributes and sees Table 1) is investigated SAPO-11 molecular sieve hydrocarbon catalytic cracking performance.
Preparation of Catalyst: with 10.0 gram pseudo-boehmites, place 40 ml distilled water vigorous stirring, and drip 10.0 milliliters of phosphoric acid, stir under 16 ℃; Simultaneously in another beaker, place 80 milliliters of n-hexyl alcohols to stir 0.4 gram cetyl trimethylammonium bromide, add under 16 ℃ of 3.6 milliliters of tetraethoxysilances and stir; Two mixed solutions are mixed vigorous stirring, and slowly drip 12.0 milliliters positive dipropyl amine, continue to stir 1 hour, packing into has in the stainless steel cauldron of polytetrafluoroethylene bushing, then 180 ℃ of crystallization 56 hours, takes out, cooling, filter, 85 ℃ of oven dry promptly obtained the SAPO-11 sample that the roasting back aperture is 0.62 nanometer in 30 hours 560 ℃ of following roastings, and this sample promptly obtains the catalyzer of testing after moulding.
30 grams are prepared catalyzer as stated above packs in the small-sized fluidized bed reactor.Be warming up to 400 ℃, and with steam activation 2 hours, be warming up to temperature of reaction then, the weight space velocity of material carbon four hydrocarbon and water and material carbon four hydrocarbon weight ratios see Table 2, and sampling analysis after 2 minutes reaction times the results are shown in Table 2:
Table 1 derives from the mixed C of FCC 4Weight percent form
The component title Weight percent is formed, % The component title Weight percent is formed, %
Trimethylmethane 3.249 1-butylene 51.857
Normal butane 13.368 Iso-butylene 0.048
Propadiene 0.068 Suitable-2-butylene 13.211
Acetylene 0.008 Iso-pentane 0.002
Neopentane 0.149 Skellysolve A 0.000
Instead-2-butylene 17.259 1,3-butadiene 0.110
Amylene and isohexane 0.127 Methylacetylene 0.004
Normal hexane 0.007 More than carbon six reaches 0.531
Table 2 different condition experimental result
Temperature of reaction [℃] 404.8 455.2 507.3 535.3 566.2 607.6
Weight space velocity [hour -1] 15 6.103 9.21 6.103 3.13 1.10
Reaction pressure (MPa) 0 0.02 0.08 0.12 0.02 0.04
Water: alkene in the raw material (weight ratio) 0.5 2.614 1.41 1.314 1.314 1.11
C4=transformation efficiency % 66.298 68.611 68.445 68.213 67.895 64.085
Ethylene selectivity % 2.712 5.281 9.553 13.176 16.923 17.993
Propylene selectivity % 24.299 31.275 39.792 44.920 49.241 47.043
(E+P) selectivity % 27.011 36.557 49.345 58.095 66.164 65.037
Yield of ethene % 1.798 3.624 6.538 8.988 11.490 11.531
Propene yield % 16.110 21.458 27.236 30.641 33.432 30.148
(E+P) yield % 17.908 25.082 33.774 39.628 44.922 41.679
Wherein E is an ethene, and P is a propylene.
[embodiment 7]
With carbon eight monoolefine mixtures is raw material, is catalyzer by catalyzer among the embodiment 1, and the catalyzer of 30 gram embodiment 1 are packed in the small-sized fluidized bed reactor.Be warming up to 400 ℃, and with steam activation 2 hours, be warming up to 550 ℃ of temperature of reaction then, the weight space velocity of material carbon eight hydrocarbon is 3.5 hours -1, carbon eight alkene weight ratios are 0.6: 1 in water and the raw material, reaction pressure is 0.1MPa.During 2 minutes reaction times, sampling analysis the results are shown in Table 3.
Table 3 carbon eight catalytic material cracking results
Project Weight yield % Project Weight yield %
Hydrogen 0.034026 Instead-2-butylene 8.359012
Methane 0.139401 Butene-1 6.073559
Ethane 0.13923 Iso-butylene 14.02007
Ethene 9.05507 Suitable-2-butylene 6.06962
Propane 2.190713 Pentane 0.390647
Cyclopropane 0.004815 Iso-pentane 0.581882
Propylene 32.60987 Skellysolve A 0.328657
Trimethylmethane 2.636196 Amylene and isohexane 14.74411
Normal butane 2.185898 Carbon is more than six 0.212124
Neopentane 0.225097
Yield of ethene is 9.05%, and propene yield is 32.61%, and ethene+propene yield is 41.66%, and feed stock conversion is 69%.
[embodiment 8]
Adopt C in the methanol decomposition producing light olefins by product 4To C 7Monoolefine is a raw material, investigates the cracking performance of catalyzer.
Each step and operational condition according to embodiment 1 just change the catalytic pyrolysis raw material, and cracking stock adopts C in the methanol decomposition producing light olefins by product 4To C 7Monoolefine, wherein C 4And C 5Olefin(e) centent is 85%, and all the other about 15% are C 6Above alkene.
30 grams are packed in the small-sized fluidized bed reactor by the catalyzer of embodiment 1 method preparation.Be warming up to 400 ℃, and with steam activation 2 hours, be warming up to 530 ℃ of temperature of reaction then, the weight space velocity of raw material hydrocarbon is 6.10 hours -1, the alkene weight ratio is 1.3: 1 in water and the raw material, reaction pressure is 0.05MPa, sampling analysis after 2 minutes reaction times.Reaction result is 8.34% for the weight ethylene yield, and the propylene weight yield is 33.95%, and the total olefin transformation efficiency is 72%.
[embodiment 9]
According to each step and the operational condition of embodiment 1, just change: molecular sieve is the SAPO-31 molecular sieve, and the aperture is 0.65 nanometer.With the mixed c 4 that derives from FCC is raw material (component distributes and sees Table 1), and temperature of reaction is 510 ℃, and weight space velocity is 2.3 hours -1, the alkene weight ratio in water and material carbon four hydrocarbon is 1.2: 1, reaction pressure is 0.2MPa, sampling analysis during 2 minutes reaction times.Its reaction result: yield of ethene is 6.46%, and propene yield is 22.37%, and the C 4 olefin transformation efficiency is 70.3%.
[embodiment 10]
According to each step and the operational condition of embodiment 1, just change: molecular sieve is the SAPO-41 molecular sieve, and the aperture is 0.60 nanometer.With the mixed c 4 that derives from FCC is raw material (component distributes and sees Table 1), and temperature of reaction is 560 ℃, and weight space velocity is 2.3 hours -1, the alkene weight ratio is 1.2: 1 in water and material carbon four hydrocarbon, reaction pressure is 0.45MPa, sampling analysis during 2 minutes reaction times.Its reaction result: yield of ethene is 4.98%, and propene yield is 21.68%, and the C 4 olefin transformation efficiency is 73.8%.
[embodiment 11]
According to each step and the operational condition of embodiment 1, just change: molecular sieve is the SAPO-11 molecular sieve, and the aperture is 0.60 nanometer.To mix carbon five is raw material, and temperature of reaction is 560 ℃, and weight space velocity is 1.3 hours -1, the alkene weight ratio is 3: 1 in water and material carbon five hydrocarbon, reaction pressure is 0.01MPa, sampling analysis during 2 minutes reaction times.Its reaction result: yield of ethene is 7.88%, and propene yield is 35.68%, and the C 4 olefin transformation efficiency is 68.75%.
[comparative example 1]
Employing is formed and appreciation condition with the identical catalyzer of embodiment 11, identical raw material, and different is to adopt fixed-bed reactor.Its reaction result: yield of ethene is 4.18%, and propene yield is 25.71%, and the C 4 olefin transformation efficiency is 70.39%.

Claims (6)

1, a kind of method of catalytic cracking for producing propylene using, with the rich olefins mixture that contains one or more carbon four or above alkene is raw material, in fluidized-bed reactor, making the rich olefins raw material is that the mesopore silicoaluminophosphamolecular molecular sieves catalyzer of 0.6～0.65 nanometer contacts with the aperture in the presence of water vapour, generates the effluent that contains propylene.
2,, it is characterized in that carbon four and above cut or the carbon four of by-products such as alpha-olefin coproduction, MTO and MTP and the above olefin fraction thereof of the rich olefins mixture material of one or more carbon four or above alkene from steam cracking device in plant catalytic cracker, the ethylene plant according to the method for the described catalytic cracking for producing propylene using of claim 1.
3,, it is characterized in that the rich olefins mixture is C according to the method for the described catalytic cracking for producing propylene using of claim 2 4～C 12Normal olefine.
4, according to the method for the described catalytic cracking for producing propylene using of claim 1, it is characterized in that the operational condition of fluidized-bed reactor: temperature of reaction is 400～650 ℃, and weight space velocity is 0.1～50 hour -1, reaction pressure is 0～0.5MPa, the alkene weight ratio in water vapour and the rich olefins raw material is 0～5: 1.
5, according to the method for the described catalytic cracking for producing propylene using of claim 4, it is characterized in that the operational condition of fluidized-bed reactor: temperature of reaction is 450～550 ℃, and weight space velocity is 1～15 hour -1, reaction pressure is 0.02～0.15MPa, the alkene weight ratio in water vapour and the rich olefins raw material is 0.5～2: 1.
6,, it is characterized in that described mesopore silicoaluminophosphamolecular molecular sieves is the SAPO-11 molecular sieve catalyst according to the method for the described catalytic cracking for producing propylene using of claim 1.
CNB2005100294684A 2005-09-07 2005-09-07 Method of preparing propylene by catalytic cracking Active CN100413823C (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8137631B2 (en) 2008-12-11 2012-03-20 Uop Llc Unit, system and process for catalytic cracking
US8246914B2 (en) 2008-12-22 2012-08-21 Uop Llc Fluid catalytic cracking system
US8889076B2 (en) 2008-12-29 2014-11-18 Uop Llc Fluid catalytic cracking system and process
CN114570420A (en) * 2022-03-30 2022-06-03 江南大学 Catalytic system for preparing propylene by catalyzing cracking of long-chain olefin and application thereof

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5990369A (en) * 1995-08-10 1999-11-23 Uop Llc Process for producing light olefins
US6303839B1 (en) * 2000-06-14 2001-10-16 Uop Llc Process for producing polymer grade olefins
FR2837199B1 (en) * 2002-03-15 2005-09-16 Inst Francais Du Petrole METHOD FOR CONVERTING INTO MULTIPLE STEPS A LOAD COMPRISING FOUR OLEFINS, FIVE ATOMS OF CARBON OR MORE, FOR PRODUCING PROPYLENE

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8137631B2 (en) 2008-12-11 2012-03-20 Uop Llc Unit, system and process for catalytic cracking
US8246914B2 (en) 2008-12-22 2012-08-21 Uop Llc Fluid catalytic cracking system
US8889076B2 (en) 2008-12-29 2014-11-18 Uop Llc Fluid catalytic cracking system and process
CN114570420A (en) * 2022-03-30 2022-06-03 江南大学 Catalytic system for preparing propylene by catalyzing cracking of long-chain olefin and application thereof
CN114570420B (en) * 2022-03-30 2023-09-08 江南大学 Catalytic system for preparing propylene by catalyzing long-chain olefin pyrolysis and application thereof

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