CN106631689A - Preparation method for sec-butyl alcohol - Google Patents
Preparation method for sec-butyl alcohol Download PDFInfo
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- CN106631689A CN106631689A CN201510729540.8A CN201510729540A CN106631689A CN 106631689 A CN106631689 A CN 106631689A CN 201510729540 A CN201510729540 A CN 201510729540A CN 106631689 A CN106631689 A CN 106631689A
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- butyl alcohol
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/09—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by hydrolysis
- C07C29/095—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by hydrolysis of esters of organic acids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
- B01J31/06—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing polymers
- B01J31/08—Ion-exchange resins
- B01J31/10—Ion-exchange resins sulfonated
Abstract
The invention provides a preparation method for sec-butyl alcohol. The preparation method comprises the following steps: placing a strongly-acidic cation exchange resin catalyst applicable to catalyzing sec-butyl acetate to hydrolyze into a low-carbon alcohol solution, carrying out high-temperature and high-pressure treatment, and catalyzing sec-butyl acetate to hydrolyze so as to prepare the sec-butyl alcohol. According to the invention, the strongly-acidic cation exchange resin pretreated by adopting the method provided by the invention can greatly improve the conversion rate of raw materials, and can also maintain high-level catalytic activity and product selectivity at the same time; meanwhile, the whole technical process has simple operation and is green and environment-friendly.
Description
Technical field
The present invention relates to a kind of preparation method of sec-butyl alcohol, relates in particular to a kind of under acid cation exchange resin effect, the method for preparing sec-butyl alcohol by sec-Butyl Acetate hydrolysis.
Background technology
Sec-butyl alcohol can be used as solvent, and with methyl alcohol cosolvent is made, and can also be used as emulsifying agent, paint stripper, dehydrating agent, dye dispersant, industrial detergent etc. as the component for improving octane number；It is additionally operable to produce dressing agent, plasticizer, herbicide etc.；But topmost application is Jing catalytic dehydrogenations production MEK, accounts for the 90% of total flow.
The method of conventional synthesis sec-butyl alcohol is to generate sec-butyl alcohol with n-butylene hydration, mainly there is 3 kinds of sulfuric acid indirect hydration, resin catalysis direct hydration and heteropoly acid catalysis direct hydration.（1）Sulfuric acid indirect hydration：With the mixing C 4 fraction of the pretreated n-butene of the sulfuric acid absorption that concentration is 50% or so, butyl sulfuric ester is generated, then hydrolyze and obtain the sec-butyl alcohol aqueous solution.But due to using sulfuric acid, equipment corrosion is serious, and plant investment is larger, need to consume a large amount of sulphur bronsted lowry acids and bases bronsted lowries, and the three wastes are more, and n-butene unit consumption is higher.（2）Resin catalysis direct hydration：Using strong-acid cation-exchange resin catalyst.But the method has high demands to raw material n-butene, n-butene reaction conversion per pass is low.（3）Heteropoly acid catalysis direct hydration：Using heteropolyacid catalyst, Main Ingredients and Appearance Shi Molybdenum phosphoric acid, and organo-metallic compound additive is added, 200 DEG C -230 DEG C of reaction temperature, reaction pressure 19.0MPa.N-butene conversion per pass 25%-30%.But the method reaction pressure is high, and the conversion ratio of n-butene is relatively low.
In order to overcome the shortcoming of traditional handicraft, CN200810016495 proposes a kind of process of continuously producing sec-butyl alcohol by direct hydration of n-butene, in the presence of strong acid ion exchange resin catalyst, fresh n-butene raw material is mixed into hydration reactor and carries out hydration reaction with circulation n-butene, separated subsequently into crude product separative element, set up n-butene refined unit, the unreacted n-butene isolated by crude product separative element, a part is back to hydration reactor and continues to participate in hydration reaction as circulation n-butene, another part is sent to n-butene refined unit and is refined, removing butane, reclaim n-butene, continuation is used as fresh n-butene raw material.
CN97116406 proposes a kind of method that low-carbon alkene direct hydration continuously produces low-carbon alcohols, in the presence of strongly acidic cation-exchange catalyst, after raw material hydrocarbon containing low-carbon alkene mixes with raw water and recycle hydrocarbons, into main reactor, subsequently into crude product separator, it is characterized in that being additionally provided with auxiliary reactor and phase separator after crude product separator, main reactor is returned by the crude product separator unreacted part of the hydrocarbon component containing low-carbon alkene in main reactor out as recycle hydrocarbons, after another part mixes with deionized water, hydration reaction is further carried out into auxiliary reactor, product is entered in phase separator and separated, it is separated go out aqueous solution of alcohol, main reactor is entered as the raw water of main reactor, separated hydrocarbon phase discharger.
The process route of sec-butyl alcohol made above, has the disadvantages that：1) conversion per pass is low, less than 10%；2) it is high to raw material n-butene concentration requirement, need to be used after concentrate；3) reaction temperature is high, and more than 140 DEG C, energy consumption is big.
CN102659514A proposes a kind of method that sec-Butyl Acetate catalyzing hydrolysis produce sec-butyl alcohol, with sec-Butyl Acetate as raw material, it is fixed a continuous catalysis hydrolysis, catalyst adopts commercially available styrene type cation exchange resin catalyst, it is loaded into the calandria type fixed bed continuous pipe of series connection, described series connection is calandria type fixed bed comprising multiple duplicate shell and tube reactors, raw material sec-Butyl Acetate and water enter shell and tube reactor, continuous catalysis hydrolysis generates sec-butyl alcohol crude product, then the refined prepared high-purity sec-butyl alcohols of Jing under catalyst action.The high conversion rate of method of the present invention production sec-butyl alcohol, and the range of application of sec-Butyl Acetate can be improved, improve the added value of sec-Butyl Acetate.But the method complex technical process, high energy consumption.
CN102838450A proposes a kind of method that utilization catalyzing cation exchange resin synthesizes sec-butyl alcohol, with sec-butyl acetate and methyl alcohol as raw material, the ester exchange synthesis sec-butyl alcohol under cationic ion-exchange resin effect, and the conversion ratio of sec-butyl acetate is up to 35%-50%.It is gentle with reaction condition, little is acted on to equipment corrosion, selective high, catalyst activity is high, the advantages of reusable.CN102731250A proposes a kind of method of synthesis sec-butyl alcohol, with sec-Butyl Acetate and methyl alcohol as raw material, by ester exchange sec-butyl alcohol is produced, and accessory substance is methyl acetate, and the yield of sec-butyl alcohol reaches 50%-90%.Compared with n-butylene hydration method prepares sec-butyl alcohol, reaction rate is fast, high conversion rate, selective high, reaction condition are gentle, little to the corrosion of equipment, and by-product methyl acetate is also a kind of important raw material of industry.CN102875328A proposes a kind of catalytic rectification process and its production equipment of ester-interchange method synthesis sec-butyl alcohol, and technological process is：The upper and lower of raw material sec-Butyl Acetate, methyl alcohol respectively from the conversion zone of catalytic rectifying tower enters, under the catalytic action of cationic ion-exchange resin there is ester exchange reaction and carry out vapour-liquid mass in two kinds of raw materials in conversion zone, realize continuous catalyzing rectifying process, the method adopts cationic ion-exchange resin for catalyst and catalytic rectification process, can operate continuously, simplification of flowsheet, avoid alkali salt catalyst recovery and tower in catalyst the problems such as be easy to crystallization and separate out, with energy consumption it is low, material consumption is low, reaction conversion ratio is high, product quality is stable the features such as.
The conversion ratio that there is sec-butyl acetate in the above-mentioned methods is low, there is that by-product methyl acetate is produced.
Li Fengyun is in " synthesizing sec-butyl alcohol using heteropoly acid " text, the use of heteropoly acid is catalyst, anhydrous glacial acetic acid and n-butene addition reaction generate sec-Butyl Acetate, and then sec-Butyl Acetate hydrolysis generates sec-butyl alcohol, its hydrolysis predominantly directly adds water, and hydrolyzes in acid condition.This method makes butylene produce sec-butyl alcohol by indirect method, has widened the application market of sec-Butyl Acetate.But this method has conversion ratio low using heteropoly acid as catalyst, and accessory substance is more, hydrolyze it is not thorough the shortcomings of need solve.
Wang Ruoyu etc. in " sec-Butyl Acetate Hydrogenation is for sec-butyl alcohol " text, with sec-Butyl Acetate as raw material, CuO/Al2O3For hydrogenation catalyst, catalytic hydrogenation prepares sec-butyl alcohol.In 265 DEG C of reaction temperature, reaction pressure 8.0MPa, air speed 0.2h-1, under conditions of the amount of hydrogen ester material is than 20, sec-Butyl Acetate conversion ratio is 98.16%, and sec-butyl alcohol is selectively 20.48%, and butanol selectivity is 93.37%, and ethanol selectivity is 88.81%.Compared with existing sec-butyl alcohol technology, with sec-butyl alcohol yield it is high, energy consumption is low, flow process is short, process cleans and the carbinol derivatives acetic acid of low value is converted into the advantages such as the ethanol of high value.But this method sec-butyl alcohol is selectively low, only 20.48%.
The content of the invention
Sec-butyl alcohol preparing technique process process complexity, conversion ratio and selectivity are low in solve the problems, such as prior art, the present invention proposes a kind of method for preparing sec-butyl alcohol, first low-carbon alcohols pretreatment is carried out to strong-acid cation-exchange resin, it is again that catalyst sec-Butyl Acetate hydrolysis prepares sec-butyl alcohol with it, has the advantages that low process is simple, energy consumption, conversion ratio, selectivity and product yield are high.
The technical purpose of the present invention is achieved through the following technical solutions：
A kind of preparation method of sec-butyl alcohol, comprises the following steps：
1. low-carbon alcohols and the oxygen in deionized water are removed in advance, strong-acid cation-exchange resin catalyst is placed in the aqueous solution of low-carbon alcohols, be put into closed container and be heated to processing 8 ~ 24h under 100 DEG C ~ 250 DEG C self-generated pressures；
The low-carbon alcohols are at least one in the alcohol of C1 ~ C4；
2. the strong-acid cation-exchange resin catalyst that 1. step is modified is taken, in being placed in continuous fixed bed stainless steel reactor, sec-Butyl Acetate and water are passed through to be hydrolyzed in reactor are prepared sec-butyl alcohol.
Further, at least one of the low-carbon alcohols in methyl alcohol, ethanol, propyl alcohol, isopropanol, n-butanol, the tert-butyl alcohol, sec-butyl alcohol and isobutanol, at least one more preferably in propyl alcohol, isopropanol, n-butanol, the tert-butyl alcohol, sec-butyl alcohol and isobutanol, most preferably sec-butyl alcohol.
Further, the volumetric concentration of alcohol is 0.5% ~ 20%, preferably 1% ~ 10% in the aqueous solution of the low-carbon alcohols, and the aqueous solution of low-carbon alcohols is with the mixed volume ratio of strong-acid cation-exchange resin（5~15）:1, preferably（5-10）:1.
During processing strong-acid cation-exchange resin, the solution for being used has to pass through deoxygenation process, additionally should ensure that in treatment fluid and does not contain metal ion, especially iron.
Further, the strong-acid cation-exchange resin refers to can be catalyzed the resin catalyst that sec-Butyl Acetate generates sec-butyl alcohol, technical scheme is may be applicable to, the type strong-acid cation-exchange resin catalysts of DNW- II for for example preparing in the present invention also can be obtained by buying.
Further, the temperature of step 1. middle heating is preferably 100 DEG C ~ 150 DEG C, and the time of heating is preferably 12 ~ 24h.
Further, step 1. the middle closed container for adopting for suitable for the reactor of all kinds of inert material substrates of hydro-thermal reaction, the such as container of enamel, glass, ceramics or tetrafluoroethene substrate.
Further, step 2. described in sec-Butyl Acetate hydrolyze when water be with the mol ratio of sec-Butyl Acetate（2~10）:1, preferably（2~5）：1, the liquid quality air speed of sec-Butyl Acetate is 0.5h-1~3.0h-1, preferably 0.5h-1-1.5h-1, reaction temperature is 100 DEG C -150 DEG C, and preferably 100 DEG C -120 DEG C, reaction pressure is 0.5MPa-5.0MPa, preferably 0.5MPa-2.5MPa.
Further, 2. step generates the mixture of sec-butyl alcohol and acetic acid after the hydrolysis of middle sec-Butyl Acetate, and sec-butyl alcohol is obtained after separation.
Beneficial effects of the present invention：
（1）The process is simple of the present invention, reaction condition is gentle, is easy to operation, it is easy to accomplish industrialization.
（2）, using the strong-acid cation-exchange resin after low-carbon alcohols process as catalyst, catalysis activity is high, and feed stock conversion, product selectivity are significantly improved for the present invention, therefore whole technical process is environmental protection technique.
Specific embodiment
Following non-limiting examples can make one of ordinary skill in the art that the present invention is more fully understood, but limit the present invention never in any form.
Embodiment
1
（1）The preparation of the type strong-acid cation-exchange resins of DNW- II：
The preparation method of the type heatproof strong-acid cation-exchange resin catalysts of DNW- II is a lot, the resin catalyst prepared according to method of the prior art may be applicable to the present invention, resin catalyst in the present embodiment stabilizes five steps and prepares using polymerization, extracting, chlorination, sulfonation and active group, specific as follows：Polymerization obtains styrene-divinylbenzene copolymer microballoon, it is swelling, stirring extracting under copolymer after will be swelling is blended in 180 DEG C, 2.0MPa with benzene processes 16h, cooling, benzene is discharged, then copolymer is placed in into absolute ethyl alcohol extracting under similarity condition and processed, washing, after carrying out chlorination, sulfonation, active group stabilisation successively to copolymer after purification, the type heatproof strong-acid cation-exchange resin catalysts of DNW- II are obtained.
（2）The pretreatment of the type strong-acid cation-exchange resins of DNW- II：
Isopropanol, sec-butyl alcohol and deionized water are carried out in advance deoxygenation process, with preparing isopropanol and sec-butyl alcohol volume fraction 5% low-carbon (LC) mixed alkoxide solution is, the type strong-acid cation-exchange resins of DNW- II are placed in above-mentioned low-carbon (LC) mixed alkoxide solution, be put into enamelled vessel.Low-carbon (LC) mixed alkoxide solution is 5 with the type strong-acid cation-exchange resin volume ratios of DNW- II:1, process 8h under 100 DEG C of self-generated pressures.
（3）Catalyst preparation sec-butyl alcohol is done with the type strong-acid cation-exchange resins of DNW- II of pretreatment：
Take above-mentioned pretreated catalyst to be fitted into the stainless steel reactor of Φ 18mm × 1200mm, reactor head and bottom are respectively charged into the quartz sand of a diameter of Φ 0.5mm ~ 1.2mm, after reactor is installed, with nitrogen displacement three times, and air seal test is qualified.It is passed through sec-Butyl Acetate and water is hydrolyzed reaction, wherein water and the mol ratio of sec-Butyl Acetate is 5：1；The liquid quality air speed of sec-Butyl Acetate is 1.0h-1；Reaction temperature is 120 DEG C；Reaction pressure is 2.5MPa, at set intervals sample analysis, calculates conversion ratio and selectivity.
Embodiment
2
Remove（2）In replaced outside isopropanol and sec-butyl alcohol with ethanol and sec-butyl alcohol, other conditions are same as Example 1.
Embodiment
3
Remove（2）In replaced outside isopropanol and sec-butyl alcohol with ethanol and isopropanol, other conditions are same as Example 1.
Embodiment
4
Remove（2）In replaced outside isopropanol and sec-butyl alcohol with sec-butyl alcohol, other conditions are same as Example 1.
Embodiment
5
Remove（2）In replaced outside isopropanol and sec-butyl alcohol with isopropanol, other conditions are same as Example 1.
Embodiment
6
Remove（2）In replaced outside isopropanol and sec-butyl alcohol with methyl alcohol and isopropanol, other conditions are same as Example 1.
Embodiment
7
Remove（2）In replaced outside isopropanol and sec-butyl alcohol with methyl alcohol and sec-butyl alcohol, other conditions are same as Example 1.
Embodiment
8
Remove（2）In with 5% methyl alcohol replace low-carbon (LC) mixed alkoxide solution outside, other conditions are same as Example 1.
Embodiment
9
Remove（2）The middle concentration by isopropanol and sec-butyl alcohol changes into respectively 0.5% and 9.5%, and other conditions are same as Example 1.
Embodiment
10
Remove（2）The middle concentration by isopropanol and sec-butyl alcohol changes into respectively 9.5% and 0.5%, and other conditions are same as Example 1.
Embodiment
11
Remove（2）The middle concentration by isopropanol and sec-butyl alcohol changes into respectively 0.5% and 0.5%, and other conditions are same as Example 1.
Embodiment
12
Remove（2）It is middle that low-carbon (LC) mixed alkoxide solution and the type strong-acid cation-exchange resin volume ratios of DNW- II are changed into 10:1, pretreatment condition is changed to process 24h under 150 DEG C and self-generated pressure, and other conditions are same as Example 1.
Embodiment
13
Remove（2）It is middle that low-carbon (LC) mixed alkoxide solution and the type strong-acid cation-exchange resin volume ratios of DNW- II are changed into 15:1, pretreatment condition is changed to process 12h under 150 DEG C and self-generated pressure, and other conditions are same as Example 1.
Comparative example
1
Directly using step in embodiment 1（1）, used as catalyst sec-Butyl Acetate hydrolysis, hydrolysis condition is with step in embodiment 1 for the strong-acid cation-exchange resins of DNW- II of preparation（3）.
Each embodiment and comparative example catalysis sec-Butyl Acetate hydrolysis prepare the conversion ratio and sec-butyl alcohol of sec-butyl alcohol reaction and are selectively shown in Table 1.Can be seen that by data in table 1 and be catalyzed sec-Butyl Acetate hydrolysis after the strong-acid cation-exchange resins of DNW- II are modified using the preprocess method of the present invention again, its sec-Butyl Acetate conversion ratio is significantly improved.
The each embodiment of table 1. and comparative example catalytic result
Claims (10)
1. a kind of preparation method of sec-butyl alcohol, comprises the following steps：
1. low-carbon alcohols and the oxygen in deionized water are removed in advance, strong-acid cation-exchange resin catalyst is placed in the aqueous solution of low-carbon alcohols, be put into closed container and be heated to processing 8 ~ 24h under 100 DEG C ~ 250 DEG C self-generated pressures；
The low-carbon alcohols are at least one in the alcohol of C1 ~ C4；
2. the strong-acid cation-exchange resin catalyst that 1. step is modified is taken, in being placed in continuous fixed bed stainless steel reactor, sec-Butyl Acetate and water are passed through to be hydrolyzed in reactor are prepared sec-butyl alcohol.
2. the preparation method of sec-butyl alcohol according to claim 1, it is characterised in that：At least one of the low-carbon alcohols in methyl alcohol, ethanol, propyl alcohol, isopropanol, n-butanol, the tert-butyl alcohol, sec-butyl alcohol and isobutanol.
3. the preparation method of sec-butyl alcohol according to claim 2, it is characterised in that：At least one of the low-carbon alcohols in propyl alcohol, isopropanol, n-butanol, the tert-butyl alcohol, sec-butyl alcohol and isobutanol.
4. the preparation method of sec-butyl alcohol according to claim 3, it is characterised in that：The low-carbon alcohols are sec-butyl alcohol.
5. the preparation method of sec-butyl alcohol according to claim 1, it is characterised in that：The volumetric concentration of alcohol is 0.5% ~ 20% in the aqueous solution of the low-carbon alcohols.
6. the preparation method of sec-butyl alcohol according to claim 5, it is characterised in that：The volumetric concentration of alcohol is 1% ~ 10% in the aqueous solution of the low-carbon alcohols.
7. the preparation method of sec-butyl alcohol according to claim 1, it is characterised in that：1. the aqueous solution of middle low-carbon alcohols and the mixed volume ratio of strong-acid cation-exchange resin are 5 ~ 15 to step:1.
8. the preparation method of sec-butyl alcohol according to claim 1, it is characterised in that：Step 1. middle heating temperature be 100 DEG C ~ 150 DEG C.
9. the preparation method of sec-butyl alcohol according to claim 1, it is characterised in that：Step 1. middle heating time be 12 ~ 24h.
10. the preparation method of sec-butyl alcohol according to claim 1, it is characterised in that：Step 2. described in sec-Butyl Acetate when hydrolyzing the mol ratio of water and sec-Butyl Acetate be 2 ~ 10:1, the liquid quality air speed of sec-Butyl Acetate is 0.5h-1~3.0h-1, reaction temperature is 100 DEG C ~ 150 DEG C, and reaction pressure is 0.5MPa ~ 5.0MPa.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108017507A (en) * | 2017-12-04 | 2018-05-11 | 福州大学 | A kind of method of fixed bed-reactive distillation Joint Production high-purity sec-butyl alcohol |
| CN109205572A (en) * | 2017-06-30 | 2019-01-15 | 中国石油化工股份有限公司 | A method of purifying hydrogen peroxide |
| CN109678670A (en) * | 2017-10-19 | 2019-04-26 | 中国石油化工股份有限公司 | A method of preparing sec-butyl alcohol |
| CN115894171A (en) * | 2022-11-17 | 2023-04-04 | 凯瑞环保科技股份有限公司 | Method for preparing sec-butyl alcohol by sec-butyl acetate hydrogenation |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102659514A (en) * | 2012-04-26 | 2012-09-12 | 凯瑞化工股份有限公司 | Method for producing sec-butyl alcohol |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102659514A (en) * | 2012-04-26 | 2012-09-12 | 凯瑞化工股份有限公司 | Method for producing sec-butyl alcohol |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109205572A (en) * | 2017-06-30 | 2019-01-15 | 中国石油化工股份有限公司 | A method of purifying hydrogen peroxide |
| CN109205572B (en) * | 2017-06-30 | 2021-03-05 | 中国石油化工股份有限公司 | Method for purifying hydrogen peroxide |
| CN109678670A (en) * | 2017-10-19 | 2019-04-26 | 中国石油化工股份有限公司 | A method of preparing sec-butyl alcohol |
| CN109678670B (en) * | 2017-10-19 | 2022-06-07 | 中国石油化工股份有限公司 | Method for preparing sec-butyl alcohol |
| CN108017507A (en) * | 2017-12-04 | 2018-05-11 | 福州大学 | A kind of method of fixed bed-reactive distillation Joint Production high-purity sec-butyl alcohol |
| CN115894171A (en) * | 2022-11-17 | 2023-04-04 | 凯瑞环保科技股份有限公司 | Method for preparing sec-butyl alcohol by sec-butyl acetate hydrogenation |
| CN115894171B (en) * | 2022-11-17 | 2024-04-16 | 凯瑞环保科技股份有限公司 | Method for preparing sec-butyl alcohol by hydrogenating sec-butyl acetate |
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Effective date of registration: 20230828 Address after: 100728 No. 22 North Main Street, Chaoyang District, Beijing, Chaoyangmen Patentee after: CHINA PETROLEUM & CHEMICAL Corp. Patentee after: Sinopec (Dalian) Petrochemical Research Institute Co.,Ltd. Address before: 100728 No. 22 North Main Street, Chaoyang District, Beijing, Chaoyangmen Patentee before: CHINA PETROLEUM & CHEMICAL Corp. Patentee before: DALIAN RESEARCH INSTITUTE OF PETROLEUM AND PETROCHEMICALS, SINOPEC Corp. |