CN101279258A - Method for activating ethylbenzene dehydrogenation - Google Patents
Method for activating ethylbenzene dehydrogenation Download PDFInfo
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- CN101279258A CN101279258A CNA2007100390426A CN200710039042A CN101279258A CN 101279258 A CN101279258 A CN 101279258A CN A2007100390426 A CNA2007100390426 A CN A2007100390426A CN 200710039042 A CN200710039042 A CN 200710039042A CN 101279258 A CN101279258 A CN 101279258A
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- Prior art keywords
- catalyst
- ethylbenzene
- dehydrogenation
- activation method
- activation
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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
- Y02P20/584—Recycling of catalysts
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention relates to an activation method for ethylbenzene dehydrogenation catalyst, which mainly aims at solving the problems of insufficient activation of the catalyst, long induction period, low initial activity, high initial temperature of the reaction and short service life in the prior art. The invention better solves the problems by the technical scheme that dehydrogenation catalyst is activated for more than 48 hours at the reaction temperature of higher than 600 DEG C, with more than 1.5:1 of weight ratio between water and phenylethane and under the pressure of 70-150kPaA. The method has the advantages of promoting the full formation of an active center, short induction period of the catalyst and high initial activity, which can be used for preparing styrene with ethylbenzene dehydrogenation in industrial production.
Description
Technical field
The present invention relates to a kind of activation method of catalyst for phenylethylene dehydrogenation.
Background technology
At present, the cinnamic production capacity in the world is about 2,700 ten thousand tons/year, and the styrene monomer that wherein accounts for total amount 85% is produced by the ethylbenzene catalytic dehydrogenation method, and all the other about 15% are produced by the styrene and propylene oxide co-production method.The used catalyst of ethylbenzene catalytic dehydrogenation is Fe
2O
3-K
2The O composite catalyst, Fe
2O
3Be main active component, it the reaction at the beginning of with Fe
3+Form be present in the catalyst.Studies show that in a large number ethylbenzene dehydrogenation reaction is to pass through Fe
3+/ Fe
2+Between mutually conversion realize that and this kind conversion is mainly finished in the catalyst activation stage.Therefore, the activation of catalyst just seems extremely important.
Relevantly how to promote above-mentioned conversion, people also once did excessive quantity research, as laid-open U.S. Patents 4467046,4804799,4963343,5190906 etc.Above-mentioned patent has been reported at Fe respectively
2O
3-K
2Add TiO in the O system
2, CuO, Ce
2O
3, KFe
11O
17Can improve Fe Deng species
3+/ Fe
2+Conversion environment is comparatively fast finished conversion.But to realizing the fundamental reaction of above-mentioned conversion: Fe
2O
3+ H
2→ 2FeO+H
2O, H
2Growing amount and all multifactor then shortage further investigation that influences this reaction.
Summary of the invention
Technical problem to be solved by this invention be the catalyst activation that exists in the prior art not exclusively, induction period is long, the problem that the catalyst initial activity is low provides a kind of activation method of new catalyst for phenylethylene dehydrogenation.This method has can promote that the activated centre fully forms, and makes the catalyst inducement phase short, the advantage that initial activity 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 activation method of catalyst for phenylethylene dehydrogenation, and with dehydrogenation activation more than 48 hours under the pressure of the reaction temperature more than 600 ℃, water/ethylbenzene weight ratio more than 1.5: 1 and 70～150kPaA.
In the technique scheme, the preferable range of reaction temperature is 600～620 ℃, and ethylbenzene air speed preferable range is 0.1～1.0 hour
-1, water/ethylbenzene weight ratio preferable range is 2.0～2.5: 1, and the reaction pressure preferable range is 80～100KPaA, and the preferable range of soak time is 72～120 hours.
By adopting the activation method of optimizing, the initial activity of catalyst is obviously improved among the present invention, initial activation temperature can reduce, thereby can prolong the service life of catalyst, satisfies the needs of long-term operation, has obtained better technical effect.
The present invention is further elaborated below by embodiment.
The specific embodiment
[embodiment 1]
In adiabatic negative pressure two section reactor, the control reaction temperature is 580 ℃, and water/ethylbenzene weight ratio is 1.5: 1, ethylbenzene air speed 0.25 hour
-1, negative pressure is under the 90kPaA condition, soak time is 96 hours.Ethylbenzene and water vapour are mixed back feeding reactor.Product is taken a sample after condensation and is carried out chromatography, obtains conversion of ethylbenzene, selectivity of styrene and styrene list and receives.The results are shown in Table 1.
[embodiment 2]
Reaction temperature is adjusted into 560 ℃, and the ethylbenzene air speed changes 0.10 hour into
-1, negative pressure is made as 70kPaA, and soak time is 150 hours, and all the other are with embodiment 1.
[embodiment 3]
Reaction temperature is 600 ℃, and water/ethylbenzene weight ratio changes 2.0: 1 into, and the ethylbenzene air speed changes 0.50 hour into
-1, soak time is 120 hours, all the other are with embodiment 1.
[embodiment 4]
Reaction temperature is 610 ℃, and water/ethylbenzene weight ratio changes 2.5: 1 into, and the ethylbenzene air speed changes 0.4 hour into
-1, negative pressure is made as 80kPaA, and soak time is 72 hours, and all the other are with embodiment 1.
[comparative example 1]
Then reaction temperature is brought up to 620 ℃, pressure changes normal pressure into, and soak time is 72 hours, and all the other are with embodiment 1.
[comparative example 2]
Then change the ethylbenzene air speed into 1.0 hours
-1, soak time is 48 hours, all the other are with embodiment 1.
Table 1 catalyst activation condition is to the influence of catalyst performance
Claims (6)
1. the activation method of a catalyst for phenylethylene dehydrogenation activates dehydrogenation more than 48 hours under the pressure of the reaction temperature more than 600 ℃, water/ethylbenzene weight ratio more than 1.5: 1 and 70～150kPaA.
2. according to the activation method of the described catalyst for phenylethylene dehydrogenation of claim 1, it is characterized in that reaction temperature is 600～620 ℃.
3. according to the activation method of the described catalyst for phenylethylene dehydrogenation of claim 1, it is characterized in that the ethylbenzene air speed was at 0.1～1.0 hour
-1
4. according to the activation method of the described catalyst for phenylethylene dehydrogenation of claim 1, it is characterized in that water/ethylbenzene weight ratio is 2.0～2.5: 1.
5. according to the activation method of the described catalyst for phenylethylene dehydrogenation of claim 1, it is characterized in that reaction pressure is at 80kPaA～100kPaA.
6. according to the activation method of the described catalyst for phenylethylene dehydrogenation of claim 1, it is characterized in that soak time was at 72～120 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100390426A CN101279258A (en) | 2007-04-04 | 2007-04-04 | Method for activating ethylbenzene dehydrogenation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100390426A CN101279258A (en) | 2007-04-04 | 2007-04-04 | Method for activating ethylbenzene dehydrogenation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101279258A true CN101279258A (en) | 2008-10-08 |
Family
ID=40012038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100390426A Pending CN101279258A (en) | 2007-04-04 | 2007-04-04 | Method for activating ethylbenzene dehydrogenation |
Country Status (1)
| Country | Link |
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| CN (1) | CN101279258A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102371184A (en) * | 2010-08-23 | 2012-03-14 | 中国石油化工股份有限公司 | Treatment method of ethylbenzene dehydrogenation catalyst |
| CN106582715A (en) * | 2015-10-16 | 2017-04-26 | 中国石油化工股份有限公司 | Regeneration method of alkyl aromatic hydrocarbon dehydrogenation catalyst |
| CN112239392A (en) * | 2019-07-16 | 2021-01-19 | 中国石油化工股份有限公司 | Low temperature alkyl aromatic dehydrogenation method |
| CN113877594A (en) * | 2020-07-02 | 2022-01-04 | 中国石油化工股份有限公司 | Process for dehydrogenating alkylaromatic hydrocarbons |
-
2007
- 2007-04-04 CN CNA2007100390426A patent/CN101279258A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102371184A (en) * | 2010-08-23 | 2012-03-14 | 中国石油化工股份有限公司 | Treatment method of ethylbenzene dehydrogenation catalyst |
| CN106582715A (en) * | 2015-10-16 | 2017-04-26 | 中国石油化工股份有限公司 | Regeneration method of alkyl aromatic hydrocarbon dehydrogenation catalyst |
| CN106582715B (en) * | 2015-10-16 | 2019-08-02 | 中国石油化工股份有限公司 | The regeneration method of Alkylarylhydrocarbondehydrogenating dehydrogenating catalyst |
| CN112239392A (en) * | 2019-07-16 | 2021-01-19 | 中国石油化工股份有限公司 | Low temperature alkyl aromatic dehydrogenation method |
| CN112239392B (en) * | 2019-07-16 | 2023-08-29 | 中国石油化工股份有限公司 | Method for dehydrogenating alkyl arene at low temperature |
| CN113877594A (en) * | 2020-07-02 | 2022-01-04 | 中国石油化工股份有限公司 | Process for dehydrogenating alkylaromatic hydrocarbons |
| CN113877594B (en) * | 2020-07-02 | 2023-08-04 | 中国石油化工股份有限公司 | Method for dehydrogenating alkyl aromatic hydrocarbon |
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Open date: 20081008 |