CN110218140A - A kind of method of light hydrocarbon cracking production high-quality ethylbenzene - Google Patents
A kind of method of light hydrocarbon cracking production high-quality ethylbenzene Download PDFInfo
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- CN110218140A CN110218140A CN201910573931.3A CN201910573931A CN110218140A CN 110218140 A CN110218140 A CN 110218140A CN 201910573931 A CN201910573931 A CN 201910573931A CN 110218140 A CN110218140 A CN 110218140A
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2/00—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms
- C07C2/54—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by addition of unsaturated hydrocarbons to saturated hydrocarbons or to hydrocarbons containing a six-membered aromatic ring with no unsaturation outside the aromatic ring
- C07C2/64—Addition to a carbon atom of a six-membered aromatic ring
- C07C2/66—Catalytic processes
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C4/00—Preparation of hydrocarbons from hydrocarbons containing a larger number of carbon atoms
- C07C4/02—Preparation of hydrocarbons from hydrocarbons containing a larger number of carbon atoms by cracking a single hydrocarbon or a mixture of individually defined hydrocarbons or a normally gaseous hydrocarbon fraction
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/005—Processes comprising at least two steps in series
Abstract
The present invention relates to a kind of methods of light hydrocarbon cracking production high-quality ethylbenzene, include the following steps: the preparation of (1) dense ethylene gas: light hydrocarbon feedstocks form the cracking gas containing ethylene through pyrolysis furnace, cracking gas enters depropanizing tower after supercooling, compression, enters the isolated dense ethylene gas of dethanizer from depropanizing tower tower top separation of material；(2) pretreatment of dense ethylene gas: dense ethylene gas successively imurity-removal chlorine, arsenic impurities, alkadienes, alkynes, oxygen, carbon monoxide nitrogen oxides, carbonyl sulfur, sulfur impurity and alkaline impurities to obtaining dense ethylene dry gas；(3) ethylbenzene is mass produced using liquid phase method technique using dense ethylene dry gas.It is ethylene raw present invention employs the lighter hydrocarbons of low price, realizes the purpose of large-scale production ethylbenzene using liquid phase method technique, production cost is low, and the ethylbenzene quality of production is high, market value with higher.
Description
Technical field
The invention belongs to chemical field, it is related to big using liquid phase method technique by raw material of lighter hydrocarbons such as ethane, propane, normal butanes
The method of large-scale production high quality ethylbenzene.
Background technique
Industrialized ethylbenzene is generated essentially by benzene alkylation with ethylene, and the ethylbenzene of generation is mainly used for the dehydrogenation manufacturing
Industrial chemicals monomer styrene.The raw material that ethylbenzene production needs is benzene and ethylene, and wherein benzene is that bulk material is easy buying, raw material
Ethylene can be divided into polymer grade ethylene and the catalytic cracked dry gas containing ethylene, and polymer grade ethylene is from traditional ethylene unit, second
Alkene product reaches polymer grade index, and being not required to pretreatment both can achieve the needs of ethylbenzene production, and polymer grade ethylene produces ethylbenzene
Technique is the liquid phase alkylation process that energy and material consumption is low, product quality is excellent；And the catalytic cracked dry gas containing ethylene is due to gas phase hydrocarbon
The requirement for changing catalysts needs to carry out processing, the catalytic cracked dry gas such as desulfurization, washing, de- propylene butene and produces ethylbenzene
Technique is the vapor-phase alkylation technique of energy and material consumption height, poor product quality.Polymer grade ethylene is in large supply, can satisfy extensive
The production of ten thousand tons/year of ethylbenzene of 20-80 needs, but the market price is high；Although the catalytic cracked dry gas market price is low, refined
Oily unit scale limits, and the ethylene contents in dry gas can only meet the production needs of ten thousand tons/year of ethylbenzene of small-scale 6-8.From two kinds
For ethylene source and different liquid phase reaction process, ethylbenzene produces main problem at present are as follows: is not bound with two kinds of differing ethylenes
The large-scale production process of cost of material and process advantage.
The current economic benefit main source of Benzene Device is large-scale production, high-quality ethylbenzene quality, raw material and benzene second
Alkene price difference comprehensively considers three above key factor, if a kind of feed ethylene source of low price can be provided, using liquid phase method work
Skill, form a complete production network extensive (ten thousand tons/year of 20-80) quality ethylbenzene, then having most with the ethylbenzene that the process produces
Excellent market economy.The unenforced reason of the technique is that upstream ethylene production technique is conceived into ice chest and separates at present
To polymer grade ethylene, rather than meet and directly produce ethylbenzene needs, downstream liquid phase ethylbenzene production technology only rests in a few patents
Quotient, and need to carry out the linking of intermediate pretreating process between upstream and downstream, therefore current report does not have suitable ethylbenzene raw
Production. art technology reaches this target, reports that more is the catalytic cracked dry gas containing ethylene by impurity pretreatment, meets gas phase
The technique of ethylbenzene alkylation production ethylbenzene, but gas phase alkylation reaction temperature is high, the impurity contents such as dimethylbenzene are more, ethylbenzene quality without
Method meets the needs of production top grade product styrene, and yield is small, can not large-scale production.
Patent CN102746084B registers the material processing of process for preparing ethylbenzene containing ethylene raw a kind of, contains ethylene raw
From catalytic cracking unit, feedstock processing scheme is: entering Benzene Device reacting part after absorption-desorption containing ethylene raw
Point, stripping gas enters liquid distributing device after supercooling, and stripping gas lime set containing absorbent and heavy hydrocarbon after liquid separation is from liquid distributing device bottom
Portion's extraction, a part return to absorption-desorption apparatus and are recycled, and another part send the production into process for preparing ethylbenzene containing ethylene raw
Product separate section isolates contained absorbent and heavy hydrocarbon.Either a part of stripping gas enters liquid distributing device after supercooling, separately
The product separate section that a part of stripping gas is directly entered in process for preparing ethylbenzene containing ethylene raw isolates contained absorbent and again
Hydrocarbon.The process flow is simple, is only suitable for existing dry gas vapor phase method process for preparing ethylbenzene process.
Patent CN101768043A registers the method for a kind of dilute ethylene and benzene preparing ethylbenzene by reaction, using in refinery dry gas
Dilute ethylene is raw material, enters alkylation reaction device with segmentation after selectively removing propylene by washing, in the presence of a zeolite catalyst
Alkylation reaction is carried out with benzene, alkylation reaction process takes heat using dry gas and/or low-temperature gaseous phase benzene, reduces reaction temperature rising；Hydrocarbonylation is anti-
After answering product vapor-liquid separation, tail gas successively isolates recycle benzene, second through separation system through low temperature absorption discharger, product liquid
Benzene, propyl benzene, diethylbenzene and heavy constituent；The ethylene source of this report is dilute ethylene dry gas, and it is anti-that hydrocarbonylation is carried out in gas-phase reactor
It answers, conversion of ethylene 99%, xylene content is in 800ppm in ethylbenzene, it can be seen that the process flow is simple, is suitble to dry gas gas phase
Legal system ethylbenzene process process, gas phase alkylation reaction temperature is high, and the impurity compositions such as dimethylbenzene, propyl benzene of reaction product are more, most throughout one's life
Produce ethylbenzene product poor quality, which is not suitable for production high-quality ethylbenzene (ethylbenzene meets production top grade product styrene).
Patent CN103965009B registers the method for the hydrocarbonylation tail gas ethylbenzene after the preparation of styrene with catalysis drying gas a kind of, should
Method includes separation ethane, demethanation, deethanization, oxidative dehydrogenation, dehydration depickling, alkylation reaction, separates ethylbenzene step, preferably
Absorbent and ethane, absorbent utilization process can be such that the cost of ethylbenzene processed is preferably minimized, simple process, recyclability
By force.Under suitable process conditions, the total conversion of ethane is up to 88% or more, and the overall selectivity of ethylene synthesis ethylbenzene is up to 80%
More than, the purity of ethylbenzene is up to 83% or more, and the rate of recovery of absorbent is up to 99% or more.This method use the ethane in dry gas for
Raw material, the catalytic dehydrogenation preparing ethylene after rough segmentation, further vapor-phase alkylation produce ethylbenzene.But ethane content is low in dry gas,
It cannot achieve the large-scale production of ethylbenzene, and use gas phase alkylation reaction technique, ethylbenzene product is of poor quality.
Patent CN107417484A registers the combined process system of ethylene production and ethylbenzene production a kind of, can produce simultaneously
Propylene and ethylbenzene, as ethylbenzene system, which provide raw material again, reduces the outlet pressure of charge gas compressor, shortens ethylene unit stream
Journey and investment.But the non-innovation of the process, domestic Zhejiang Daxie petrochemical industry have had 280,000 tons/year of ethylbenzene styrene raw
Produce device industrialization operation.The report compressor delivery pressure is down to 1.2-2.0MPa, although reducing pressure, dense second
After alkene dry gas is mixed with benzene, vapor phase method production technology, xylene content 1000PPM in ethylbenzene, ethylbenzene product quality can only be used
Difference, the technique can only produce national standard primes styrene.
Patent CN107473925A registers a kind of method for preparing ethylbenzene using low-carbon alkanes, this method and patent
CN107417484A report is essentially identical, produces ethylbenzene using gas phase alkylation reaction technique, only specifies alkylation reaction condition
And the mature vapor phase method catalyst of selection, reaction pressure generally control in the range of 0.85-1.5MPa, reaction temperature is general
Ground controls in the range of 320-370 DEG C, and olefin feed weight air speed is 0.1-3.6h-1, preferably 0.2-0.8h-1, benzene and alkene mole
Than can only equally produce poor product quality ethylbenzene for 5-7.
Patent CN108424345A registers a kind of ethylbenzene production plants and technique, and this report and patent CN107417484A are reported
Road is essentially identical, produces ethylbenzene using gas phase alkylation reaction technique, increases hydrogen, methane, second in recovery processing hydrocarbonylation tail gas
Alkane, ethane return to pyrolysis furnace and reduce raw material and investment.Specify that cracking obtains the processing method of ethylene dry gas, it is believed that acidity, third
The ethylbenzene products purity such as alkene has an impact.From Reporting as can be seen that inventor does not know ethylbenzene production technology, second used first
Alkene dry gas treatment process may be only available for gas phase alkylation reaction and generate ethylbenzene, poor product quality, and the content is wrong, because
Ethylbenzene catalysts are acidic catalyst, and a small amount of acidity is on ethylbenzene production itself without influence；Propylene to ethylbenzene production purity without
It influences, without purification, really influencing ethylbenzene quality is gas phase or liquid phase production technology.
With the comparison of vapor phase method reaction process condition as can be seen that lower 180-280 DEG C of liquid phase hydrocarbylation process reaction temperature, produces
Raw xylene content is controlled in 100PPM hereinafter, good product quality.And the high 320-390 of vapor phase method hydrocarbylation process reaction temperature
DEG C, the xylene content control 1000PPM of generation, poor product quality, but liquid phase alkylation reaction and gas phase alkylation reaction ethylene
The pretreating process of raw material, ethylbenzene production technology are all different, therefore produce high-quality ethylbenzene using light hydrocarbon cracking etc., need to mention
New technique production method out.
Summary of the invention
In order to overcome drawbacks described above, the present invention proposes a kind of new method of light hydrocarbon cracking production high-quality ethylbenzene, uses
It is ethylene source using cheap light hydrocarbon feedstocks, high-quality ethylbenzene, production cost is mass produced using liquid phase method technique simultaneously
Low, product quality is high.
To achieve the goals above, the technical solution of the present invention is as follows:
A kind of method of light hydrocarbon cracking production high-quality ethylbenzene, includes the following steps:
(1) preparation of dense ethylene gas: light hydrocarbon feedstocks form the cracking gas containing ethylene after pyrolysis furnace radiation cleavage, and cracking gas passes through
Enter compressor after cooling, compressed cracking gas enters depropanizing tower, isolates C3 and light component from depropanizing tower tower top
Material enters dethanizer, finally from the isolated dense ethylene gas of deethanizer overhead；
(2) pretreatment of dense ethylene gas: dense ethylene gas sequentially enters dechlorination absorber and removes impurity chlorine therein, inhales into dearsenification
Adnexa removes arsenic impurities therein, enters vulcanization hydrogenator after being heated to subsequent required reaction temperature using heating furnace,
Catalyst activity, hydrogenation and removing alkadienes, alkynes, oxygen, carbon monoxide nitrogen oxides, carbonyl are kept using the sulphur of itself in material
Base sulphur；Sulfur impurity therein is removed by alkali cleaning and water washing operations into caustic wash tower, is adsorbed using basic nitrogen is entered after compression
Device will remove alkaline impurities, to obtain dense ethylene dry gas；
(3) ethylbenzene is mass produced using liquid phase method technique using dense ethylene dry gas.
The method referenced patent application number of the production ethylbenzene of step (3) in the present invention is 201710293859.X, title
The technology contents of the method for ethylbenzene are produced for a kind of dense ethylene dry gas.
The present invention obtains the dense ethylene gas of raw material using light hydrocarbon cracking, and passes through pretreating process to the gas, to meet
Carry out the requirement of liquid phase alkylation reaction device production ethylbenzene.
For the present invention in the preparation process of dense ethylene gas, light hydrocarbon cracking unit is not provided with cold box system, into gas point operation
Gas only need plus hydrogen acetylene removal hydrocarbon can meet operation require.
The present invention pretreatment stage be stripped of on ethylbenzene reaction production process in influential impurity, as sulphur, nitrogen, chlorine,
Oxygen, oxygenatedchemicals, alkadienes etc.；Treated, and dense ethylene dry gas cooperates number of patent application to be on 201710293859.X again
The production method stated realizes that benzene is reacted with the liquid phase ethylene of dissolution step by step, and discharges unreacted fixed gas, finally realizes benzene
Alkylated reaction generates ethylbenzene under liquid-phase condition with ethylene.
As a further improvement of the present invention: it is cold that the cooling in step (1) specifically uses quenching oil column, quenching water column to carry out
But, and after being cooled to not higher than 50 degree enter compressor, to guarantee that entering compressor temperature after four-five second compressions is not higher than
90 degree, the side reactions such as cracking gas production polymerization will not be made.
As a further improvement of the present invention: entering the compressed cracking gas gas temperature of depropanizing tower in step (1)
Control is being not higher than 90 degree, and pressure is controlled in 3.5MP-4.2MP, to guarantee and reach the normal separation requirement of dethanizer.
It is ethylene raw present invention employs the lighter hydrocarbons of low price, realizes large-scale production ethylbenzene using liquid phase method technique
Purpose, production cost is low, and the ethylbenzene quality of production is high, market value with higher.
Three step units involved in the method for the present invention are to be closely connected, is indivisible, the needs of integrated artistic
Change the processing mode of each unit routine.
Detailed description of the invention
Fig. 1 is the process flow chart of dense ethylene gas in the present invention；
Fig. 2 is the dense pretreated process flow chart of ethylene gas in the present invention.
Specific embodiment
In order to deepen the understanding of the present invention, the present invention is done below in conjunction with drawings and examples and is further retouched in detail
It states.
Embodiment, it is to obtain the production technology of the dense ethylene gas of raw material using light hydrocarbon cracking as shown in Figure 1:, specifically: with
The light hydrocarbon feedstocks such as ethane, propane, butane use propane, butane for raw material in the present embodiment, by pair to gasify with pyrolysis furnace 1
The steam mixing for flowing section overheat, enters back into the radiant section of pyrolysis furnace 1, raw material becomes after 1 radiant section of pyrolysis furnace containing ethylene
Cracking gas, cracking gas are cooled to 350 degree through rapid-cooling heat exchanger 2, are cooled to 100 degree by quenching oil column 3, cold through quenching water column 4
But to charge gas compressor 5 is entered after 40 degree, the cracking gas after level Four compression reaches 4.0MP enters depropanizing tower 6, from de-
The C3 and light component material of propane column overhead extraction enter dethanizer 7, then enter in the material of depropanizing tower tower reactor extraction de-
Four tower 8 of carbon, in the isolated dense ethylene gas of 7 tower top of dethanizer, tower reactor is carbon 3 material, and the temperature of dense ethylene gas does not surpass this moment
90 degree are crossed, pressure reaches 3.2MP.
As shown in Figure 2: for the needs for adapting to liquid phase ethylbenzene reaction process, the present invention carries out pretreatment work to dense ethylene gas
Skill, specifically: dense ethylene gas sequentially enters dechlorination absorber 9 and removes impurity chlorine therein, removes it into dearsenification absorber 10
In arsenic impurities, vulcanization hydrogenator 12 is entered after being heated to 270 degree using heating furnace 11, utilizes itself sulphur in material
Keep catalyst activity, the impurity such as hydrogenation and removing alkadienes, alkynes, oxygen, carbon monoxide nitrogen oxides, carbonyl sulfur；After enter
Caustic wash tower 13 removes sulfur impurity therein by alkali cleaning and water washing operations, using entering basic nitrogen absorber after compressor 14
15, alkaline impurities will be removed, to obtain dense ethylene dry gas of the mass concentration 40% or more, ethylene concentration is in the present embodiment
57.8%。
It is divided into multiply by pretreated dense ethylene dry gas, enters absorption tower under flow control respectively, using patent Shen
Number ethylbenzene please be produced for the corresponding production technology of 201710293859.X, thus solve the purity problem of ethylbenzene product, due to
Using 180-280 DEG C of reaction temperature of liquid phase production technology, the xylene content of generation is controlled in 100PPM hereinafter, product quality
It is good, meet top grade product production of styrene needs.
Every step operation of cracking technology, removing process, pretreatment impurity removal process etc. is all conventionally known operation in the present invention,
The method have the characteristics that the integration to technique, to form the new method of a light hydrocarbon cracking production high-quality ethylbenzene.
The corresponding specific practical operation of the present embodiment are as follows: using propane and butane as raw material, propane and butane in mass ratio 50%
Left and right proportion, normal operating flow are 31820kg/h, and using above-mentioned process flow, the operation flow for obtaining dense ethylene dry gas is
20860kg/h, mass fraction of ethylene 57.8%, it is 46199kg/h that ethylbenzene operation flow, which is made, and scale produces ethylbenzene about 370,000 per year
Ton, the index such as table 1-2 of raw material and product obtain xylene content 89PPM in ethylbenzene product, meet production top grade product styrene
99.8% requirement.
1 raw material of table and dense ethylene dry gas specification
| Project | Light hydrocarbon feedstocks | Dense ethylene dry gas | Remarks |
| Component | Mass fraction | Mass fraction | |
| H2 | 0 | 1.60% | |
| N2 | 0 | 0.60% | |
| CH4 | 0 | 20.70% | |
| C2H6 | 0 | 19.20% | |
| C2H4 | 0 | 57.80% | |
| C3H6 | 0.10% | 0.04% | |
| C3H8 | 49.80% | 0.01% | |
| C4H10 | 50.05% | 0 | |
| C5 or more | 0.05% | 0 |
2 benzene feedstock specification table of table
| Component | Index |
| Benzene | >=99.9%(wt) |
| Toluene | ≤ 0.05%(wt) |
| Thiophene | ≤0.6ppm.wt |
| s | ≤0.5ppm.wt |
| Total nitrogen | ≤1.0ppm.wt |
| Basic nitrogen | ≤0.3ppm.wt |
| Coloration | ≤ 20(ASTM-D-1209) |
| It is non-aromatic | ≤0.1%.wt |
| Freezing point | ≥5.4℃ |
| Boiling range | 79.7---80.4℃ |
3 product ethylbenzene specification of table
| Component | Unit | Specification |
| Appearance | Colourless transparent liquid | |
| Density (20 DEG C) | g/cm3 | 0.868 |
| Benzene | wt% | 0.05 |
| Toluene | wt% | 0.1 |
| Ethylbenzene | wt% | 99.82 |
| Diethylbenzene | ppmwt | 5 |
| Dimethylbenzene | ppmwt | 89 |
| Isopropylbenzene | ppmwt | 210 |
The above is only used to illustrate the technical scheme of the present invention and not limits, and those of ordinary skill in the art are to the present invention
The technical solution other modifications or equivalent replacement made should all contain without departing from the spirit and scope of the technical program
Lid is in the scope of the claims of the present invention.
Claims (3)
1. a kind of method of light hydrocarbon cracking production high-quality ethylbenzene, which comprises the steps of:
(1) preparation of dense ethylene gas: light hydrocarbon feedstocks form the cracking gas containing ethylene after pyrolysis furnace radiation cleavage, and cracking gas passes through
Enter compressor after cooling, compressed cracking gas enters depropanizing tower, isolates C3 and light component from depropanizing tower tower top
Material enters dethanizer, finally from the isolated dense ethylene gas of deethanizer overhead；
(2) pretreatment of dense ethylene gas: dense ethylene gas sequentially enters dechlorination absorber and removes impurity chlorine therein, inhales into dearsenification
Adnexa removes arsenic impurities therein, enters vulcanization hydrogenator after being heated to subsequent required reaction temperature using heating furnace,
Catalyst activity, hydrogenation and removing alkadienes, alkynes, oxygen, carbon monoxide nitrogen oxides, carbonyl are kept using the sulphur of itself in material
Base sulphur；Sulfur impurity therein is removed by alkali cleaning and water washing operations into caustic wash tower, is adsorbed using basic nitrogen is entered after compression
Device will remove alkaline impurities, to obtain dense ethylene dry gas；
(3) ethylbenzene is mass produced using liquid phase method technique using dense ethylene dry gas.
2. the method for light hydrocarbon cracking production high-quality ethylbenzene according to claim 1, it is characterised in that: in step (1)
It is cooling specifically to be cooled down using quenching oil column, quenching water column, and enter compressor after being cooled to not higher than 50 degree.
3. the method for light hydrocarbon cracking according to claim 1 production high-quality ethylbenzene, it is characterised in that: in step (1) into
Enter the compressed cracking gas gas temperature control of depropanizing tower not higher than 90 degree, pressure is controlled in 3.5MP-4.2MP.
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| CN201910573931.3A CN110218140B (en) | 2019-06-28 | 2019-06-28 | Method for producing high-quality ethylbenzene by cracking light hydrocarbon |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030094398A1 (en) * | 2001-11-16 | 2003-05-22 | Porter Rodney L. | Process to produce a dilute ethylene stream an a dilute propylene stream |
| CN1630700A (en) * | 2001-11-16 | 2005-06-22 | 切夫里昂菲利普化学有限责任公司 | Process to produce a dilute ethylene stream an a dilute propylene stream |
| CN101768043A (en) * | 2008-12-31 | 2010-07-07 | 中国科学院大连化学物理研究所 | Method for preparing ethylbenzene by reaction of dilute ethylene and benzene |
| CN107473925A (en) * | 2017-08-31 | 2017-12-15 | 北京和利凯石化技术有限公司 | A kind of method that ethylbenzene is prepared using low-carbon alkanes |
| CN107827692A (en) * | 2017-04-28 | 2018-03-23 | 常州瑞华化工工程技术有限公司 | A kind of method that ethylbenzene is produced with high concentration ethylene gas |
| CN109912380A (en) * | 2017-12-12 | 2019-06-21 | 中国石油化工股份有限公司 | A kind of cracking gas separation method and device |
-
2019
- 2019-06-28 CN CN201910573931.3A patent/CN110218140B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030094398A1 (en) * | 2001-11-16 | 2003-05-22 | Porter Rodney L. | Process to produce a dilute ethylene stream an a dilute propylene stream |
| CN1630700A (en) * | 2001-11-16 | 2005-06-22 | 切夫里昂菲利普化学有限责任公司 | Process to produce a dilute ethylene stream an a dilute propylene stream |
| CN101768043A (en) * | 2008-12-31 | 2010-07-07 | 中国科学院大连化学物理研究所 | Method for preparing ethylbenzene by reaction of dilute ethylene and benzene |
| CN107827692A (en) * | 2017-04-28 | 2018-03-23 | 常州瑞华化工工程技术有限公司 | A kind of method that ethylbenzene is produced with high concentration ethylene gas |
| CN107473925A (en) * | 2017-08-31 | 2017-12-15 | 北京和利凯石化技术有限公司 | A kind of method that ethylbenzene is prepared using low-carbon alkanes |
| CN109912380A (en) * | 2017-12-12 | 2019-06-21 | 中国石油化工股份有限公司 | A kind of cracking gas separation method and device |
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