EP0000432B1 - Procédé pour effectuer l'isomérisation catalytique de composés hydrocarbonés aromatiques monocycliques substitués par des groupes méthyle - Google Patents
Procédé pour effectuer l'isomérisation catalytique de composés hydrocarbonés aromatiques monocycliques substitués par des groupes méthyle Download PDFInfo
- Publication number
- EP0000432B1 EP0000432B1 EP78300119A EP78300119A EP0000432B1 EP 0000432 B1 EP0000432 B1 EP 0000432B1 EP 78300119 A EP78300119 A EP 78300119A EP 78300119 A EP78300119 A EP 78300119A EP 0000432 B1 EP0000432 B1 EP 0000432B1
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- European Patent Office
- Prior art keywords
- zeolite
- zsm
- feedstock
- catalyst
- process according
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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
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/40—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C5/00—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms
- C07C5/22—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by isomerisation
- C07C5/27—Rearrangement of carbon atoms in the hydrocarbon skeleton
- C07C5/2729—Changing the branching point of an open chain or the point of substitution on a ring
- C07C5/2732—Catalytic processes
- C07C5/2737—Catalytic processes with crystalline alumino-silicates, e.g. molecular sieves
-
- 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
- B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
- B01J2229/10—After treatment, characterised by the effect to be obtained
- B01J2229/26—After treatment, characterised by the effect to be obtained to stabilize the total catalyst structure
-
- 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
- B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
- B01J2229/30—After treatment, characterised by the means used
- B01J2229/42—Addition of matrix or binder particles
-
- 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
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/65—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the ferrierite type, e.g. types ZSM-21, ZSM-35 or ZSM-38, as exemplified by patent documents US4046859, US4016245 and US4046859, respectively
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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
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/70—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2529/00—Catalysts comprising molecular sieves
- C07C2529/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites, pillared clays
- C07C2529/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- C07C2529/40—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2529/00—Catalysts comprising molecular sieves
- C07C2529/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites, pillared clays
- C07C2529/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- C07C2529/70—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups C07C2529/08 - C07C2529/65
Definitions
- the present invention relates to a process for the vapour-phase catalytic isomerization of monocyclic methyl-substituted aromatic hydrocarbon feedstock.
- U.S. Patent 3,856,872 A recently developed and widely adopted catalyst for use in such processes is taught by U.S. Patent 3,856,872 to be of the ZSM-5 type of zeolite, whereby the process operates at high space velocities. Further, a process utilizing ZSM-5 type zeolites in acid form for vapor-phase conversion of a feedstock containing mixed C ⁇ aromatics in the absence of added hydrogen is taught by U.S. Patent 3,856,873.
- the catalyst has increased acid activity, there can be a loss of xylene, the primary isomerization product, presumably due in part to disproportionation of xylenes and/or transalkylation of xylenes with any ethylbenzene which may be present in the reaction system.
- Patent 3,293,314 is a solid acidic mixed metal-oxide catalyst, e.g., a silica-alumina mixture, having equilibration (tending to produce equilibrium products) and coke forming activities.
- equilibration ending to produce equilibrium products
- coke forming activities Unfortunately, such catalyst materials lose their ability to maintain their equilibration tendency and, therefore, there is a decrease in desirable isomeric products as the catalysts age.
- Our DTOS 2,558,035 discloses catalytic conversion of alkyl aromatic hydrocarbons in the presence of zeolitic catalysts.
- the conversion alternates between catalytic disproportionation of toluene and non-catalytic (i.e. thermal) dealkylation of toluene in the same reactor.
- the change from the catalytic to the non-catalytic conversion is effected by eliminating the acid activity of the catalyst by contacting it with a nitrogenous poison such as ammonia or an amine, and raising the temperature.
- a process for effecting catalytic isomerization of monocyclic methyl-substituted aromatic hydrocarbon compounds of from 8 to 10 carbon atoms contained in a feedstock also containing ethylbenzene comprises contacting said feedstock in the vapor phase in a reactor with a catalyst comprising a crystalline aluminosilicate zeolite having a constraint index within the range of 1 to 12, said zeolite containing hydrogen and/or Group VIII metal cations at a temperature of 316°C to 482°C (600°F to 900°F), a pressure of 101.3 kPa to 3548.7 kPa (0 psig to 500 psig), a hydrogen/hydrocarbon mole ratio of 0 to 10 and a weight hourly space velocity of 0.1 to 200, said catalyst having been contacted, in the reactor with one or more basic nitrogen compounds, the resulting ratio of nitrogen atoms/aluminum atoms in the zeolite being from 0.01 to
- the process of the present invention wherein the catalyst has been contacted with one or more basic nitrogen-containing compounds, exhibits substantially reduced xylene loss.
- This reduction in xylene loss for isomerization of xylenes is an unexpected and significant benefit, and indicates that, whatever the monocyclic methyl-substituted aromatic hydrocarbon feedstock may be, substantial reduction in primary product losses will be effected and selectivity to desired product isomer will be enhanced.
- the preferred zeolites for use in the process are zeolites ZSM-5, ZSM-11, ZSM-12, ZSM-35 and ZSM-38: they usually constitute from 10 to 90 weight percent of a composite with a binder therefor, such as alumina.
- the preferred Group VIII metal cations are nickel, iron and/or cobalt.
- the process is particularly applicable to the isomerisation of a feedstock which contains xylenes.
- the basic nitrogen containing compounds which are employed are ammonia, alkylamines of from 1 to 40 carbon atoms, alkylenediamines of from 2 to 40 carbon atoms, aromatic amines of from 6 to 40 carbon atoms e.g. aniline, and heterocyclic nitrogen compounds such as pyridine and pyrrolidine.
- Their contact with the catalyst may be effected by periodic or continuous addition to the feedstock.
- Preferred zeolites for use in the present invention are those with a SiO 2/ A' 2 0 1 mole ratio of at least 12. Many are very well known. Zeolite ZSM-5, for instance, is described in U.S. Specification 3,702,886. Zeolite ZSM-11 1 is described in U.S. Specification 3,709,979. Zeolite ZSM-12 is described in U.S. Specification 3,970,544. Zeolite ZSM-35 is described in U.S. Specification 4,016,245. Zeolite ZSM-38 is described in U.S. Specification 4,046,859. The significance and definition of "Constraint Index" is also well known from extensive patent literature such as DTOS 2,438,252.
- the catalysts hereof are selected as those having a crystal framework density, in the dry hydrogen form, of not substantially below 1.6 grams per cubic centimeter. It has been found that zeolites which satisfy all three of these criteria are most desired for the present process. Therefore, the preferred catalysts of this invention are those having a constraint index as defined above of 1 to 12, a silica to alumina ratio of at least 12 and a dried crystal density of not less than 1.6 grams per cubic centimeter.
- the crystal framework density may be determined by classical pyknometer techniques. For example, it may be determined by immersing the dry hydrogen form of the zeolite in an organic solvent which is not sorbed by the crystal. It is possible that the unusual sustained activity and stability of this class of zeolite is associated with its high crystal anionic framework density of not less than 1.6 grams per cubic centimeter. This high density of course must be associated with a relatively small amount of free space within the crystal, which might be expected to result in more stable structures. This free space, however, is important as the locus of catalytic activity.
- Crystal framework densities of some typical zeolites are: The amount of ethylbenzene in the feedstock is usually from 5 to 30 weight percent, more usually from 10 to 25 weight percent.
- Specific compounds contemplated for isomerisation include para-xylene, meta-xylene, ortho-xylene, mesitylene (1,3,5-trimethylbenzene) durene (1,2,4,5-tetramethyibenzene), hemimellitene (1,2,3-trimethylbenzene), pseudocumene (1,2,4-trimethy)benzene), prehnitene (1,2,3,4-tetramethylbenzene) and isodurene ( 1,2,3,5-tetramethylbenzene) with the xylene isomers and pseudocumene especially preferred.
- the nitrogen-containing compounds useful in the present process are ones which neither react with the charge materials nor possess catalytic activity contrary to the purpose for their use.
- Said nitrogen-containing compounds may be gaseous, liquid or in the form of a solid dissolved in a suitable solvent, such as, for example, toluene.
- the nitrogen compounds useful in this invention are ammonia, alkylamines of from 1 to about 40 carbon atoms, and preferably from 1 to 10 carbon atoms, e.g. n-propylamine, alkylenediamines of from 2 to 40 carbon atoms, and preferably from 6 to 20 carbon atoms, aromatic amines of from 6 to 40 carbon atoms, e.g. aniline, and heterocyclic nitrogen compounds, such as pyridine and pyrrolidine.
- the catalyst may be contacted in the reactor with the nitrogen compound in a variety of ways.
- the nitrogen compound can be contacted with the catalyst by adding it to the feedstock periodically or continuously.
- Example 1 the preparation of a zeolite for use in the later Examples, and in Examples 2 to 6 embodiments of the process of the present invention, as well as comparative procedures.
- Example 2 to 6 the preparation of a zeolite for use in the later Examples, and in Examples 2 to 6 embodiments of the process of the present invention, as well as comparative procedures.
- the single Figure of the Drawing summarises the data of Examples 2 to 4.
- a sodium silicate solution was prepared by mixing 16 parts water and 27.7 parts sodium silicate (28.7 wt.% Si0 2 , 8.9 wt.% Na 2 0, 62.4% H 2 0). The solution was cooled to approximately 15°C.
- An acid solution was prepared by adding 1 part aluminum sulfate (17.2 wt.% AI 2 0 3 ) to 16.4 parts water followed by 2.4 parts sulfuric acid (93 wt.% H 2 SO 4 ) and 1.2 parts NaCI.
- An organic solution was prepared by adding 1.6 parts n-propyl bromide and 3.1 parts methyl ethyl ketone to 1.9 parts tri-n-propylamine.
- the zeolite slurry product was diluted with 4-5 parts water per part slurry, allowed to settle and supernatent liquid was drawn off. The settled solids were reslurried to the original volume of the preceding step with water. After settling, the aqueous phase was decanted. This procedure was repeated until the sodium level of the zeolite was less than 1.0 wt.%. The washed zeolite was then filtered, dried and identified as ZSM-5 having a silica/alumina mole ratio of about 70 and a constraint index of about 8.3.
- the dried zeolite was then mixed with alumina and water. It was then extruded into 2.9 cm (1.16") pellets and dried. The extruded material contained 65 parts ZSM-5 per 35 parts alumina, by weight.
- the dried extrudate was calcined for three hours at 538°C in flowing nitrogen. After cooling, the extrudate was contacted with an ammonium nitrate exchange solution (about 0.08 kg NH 4 NO 3 /kg extrudate) for one hour at ambient temperature. This exchange was then repeated until the sodium level was less than 0.05 wt.%. The extrudate was then contacted with a nickel nitrate exchange solution (about 0.1 kg Ni (Ni(N03)2. 6H.0/kg extrudate) for two hours at about 80-90°C. After this exchange, the extrudate was washed, dried and calcined in a flowing 10% air-90% nitrogen mixture at 538°C for six hours.
- an ammonium nitrate exchange solution about 0.08 kg NH 4 NO 3 /kg extrudate
- the extrudate was then contacted with a nickel nitrate exchange solution (about 0.1 kg Ni (Ni(N03)2. 6H.0/kg extrudate) for two hours at about
- 25 cc of the catalyst of Example 1 was further calcined at 538°C (1000°F) in airfor24 hours and placed in an isothermal one galion/day reactor. Pure hydrogen was continuously passed through the reactor without recycle in order to maintain a constant molar ratio between hydrogen and hydrocarbon feedstock at the reactor inlet. A feedstock comprising the components listed in Table 2 was then passed through the reactor under the conditions listed in Table 3, hereinafter presented. Also listed in Table 3 are the results of ten separate material balances over the period of 10.5 days on stream.
- the zeolite is preferably employed in association with a support or binder material which acts as diluent such as, for example, a porous inorganic oxide support or a clay binder.
- a support or binder material which acts as diluent
- binder materials include alumina, zirconia, silica, magnesia, thoria, titania, boria and combinations thereof, generally in the form of dried inorganic oxide gels and gelatinous precipitates.
- Suitable clay materials include, by way of example, bentonite and kieselguhr.
- the relative proportion of suitable crystalline aluminosilicate zeolite of the total composition of catalyst and binder or support may vary with the zeolite content ranging from between 10 to 90 percent by weight and more usually in the range of 20 to 80 percent by weight of the composition.
- WHSV Weight hourly space velocity
- Example 2 After 10.5 days on stream, the catalyst used in Example 2 was contacted in the same reactor as for Example 2 with a feedstock containing a nitrogen containing compound, i.e., 1.10-decane diamine as indicated in Table 4, hereinafter presented.
- the feedstock containing the nitrogen-containing compound was pumped through the reactor for 24 hours at operating conditions of 316°C (600°F), 1480 kPa (200 psig) a WHSV of 7 hr -1 ' and a hydrogen/hydrocarbon mole ratio of 4.
- the ratio of nitrogen atoms provided in the feed per aluminum atom in the zeolite component was 3.4.
- Example 2 Thereafter, the above feedstock without the nitrogen-containing compound was charged to the reactor and at the reaction conditions of Example 2, the catalyst was found to be inactive.
- the reaction temperature was increased, through increments, up to about 399°C (750°F), where a rapid reactivation of the catalyst was observed, as a result of desorption of part of the nitrogen from the catalyst, bringing the ratio of nitrogen atoms/aluminum atom in the zeolite component within the range of 0.01 to 1.0.
- the temperature was then reduced to 371 °C (700 0 F) where gradual recovery of catalyst activity was still observable.
- the reaction conditions and results from 8 material balances over the period of about 8 days on stream appear in Table 5.
- Example 3 The experiment of Example 3 was continued with a feedstock composed as indicated in Table 6. The conditions for and results from 10 material balances over a period of about 10 days on stream appear in Table 7.
- Example 9 A catalyst prepared as in Example 1, but not contacted with the nickel nitrate solution, was placed in the reactor used in Examples 2-4. A feedstock composed as described in Table 8 was then passed through the reactor at 273.7 kPa (25 psig), 316°C (600°F), a WHSV of 5 hr-1 and a hydrogen/hydrocarbon mole ratio of 0 (absence of added hydrogen). The results of this experiment are presented in Table 9.
- Example 5 The feedstock for Example 5 is then injected with ammonia to the extent that the ratio of nitrogen atoms/aluminum atom in the zeolite is 0.1.
- the injection of ammonia into the feedstock is stopped after a time and the reaction temperature is increased to 399°C (750°F). Results of this experiment are also presented in Table 9 for comparison with the results from Example 5.
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- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
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Claims (7)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US81391177A | 1977-07-08 | 1977-07-08 | |
US813911 | 1977-07-08 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0000432A1 EP0000432A1 (fr) | 1979-01-24 |
EP0000432B1 true EP0000432B1 (fr) | 1983-05-25 |
Family
ID=25213739
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP78300119A Expired EP0000432B1 (fr) | 1977-07-08 | 1978-07-05 | Procédé pour effectuer l'isomérisation catalytique de composés hydrocarbonés aromatiques monocycliques substitués par des groupes méthyle |
Country Status (11)
Country | Link |
---|---|
US (1) | US4158676A (fr) |
EP (1) | EP0000432B1 (fr) |
JP (1) | JPS6024771B2 (fr) |
AR (1) | AR223821A1 (fr) |
CA (1) | CA1098918A (fr) |
DE (1) | DE2862267D1 (fr) |
ES (1) | ES471561A1 (fr) |
IN (1) | IN149346B (fr) |
IT (1) | IT1109966B (fr) |
MX (1) | MX4173E (fr) |
ZA (1) | ZA783919B (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20190079385A (ko) * | 2017-12-27 | 2019-07-05 | 한화케미칼 주식회사 | 탄화수소 함유 용액 내의 방향족 함량의 측정 방법 |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1121967B (it) * | 1979-06-29 | 1986-04-23 | Montedison Spa | Zeolite mb 28 particolarmente adatta per la catalisi dell'isomerizzazione degli xileni |
US4300011A (en) * | 1980-04-28 | 1981-11-10 | Mobil Oil Corporation | Selective production of aromatics |
US4302323A (en) * | 1980-05-12 | 1981-11-24 | Mobil Oil Corporation | Catalytic hydroconversion of residual stocks |
US4533298A (en) * | 1982-12-02 | 1985-08-06 | Westinghouse Electric Corp. | Turbine blade with integral shroud |
US5100535A (en) * | 1987-12-03 | 1992-03-31 | Mobil Oil Corporation | Method for controlling hydrocracking operations |
US5419830A (en) * | 1985-07-26 | 1995-05-30 | Mobil Oil Corporation | Method for controlling hydrocracking and isomerization dewaxing |
US5043512A (en) * | 1988-10-06 | 1991-08-27 | Mobil Oil Corp. | Alkylaromatic isomerization process |
US5030787A (en) * | 1990-01-24 | 1991-07-09 | Mobil Oil Corp. | Catalytic disproportionation/transalkylation utilizing a C9+ aromatics feed |
US5905181A (en) * | 1997-12-29 | 1999-05-18 | Uop Llc | Process for the isomerization of paraffins |
US6333289B1 (en) | 1998-04-10 | 2001-12-25 | Institut Francais Du Petrole | Process for activating catalysts for isomerizing aromatic compounds containing eight carbon atoms |
FR2777207B1 (fr) * | 1998-04-10 | 2000-05-19 | Inst Francais Du Petrole | Procede d'activation des catalyseurs d'isomerisation des composes aromatiques a huit atomes de carbone |
US6313363B1 (en) | 1998-04-10 | 2001-11-06 | Institut Francais Du Petrole | Process for isomerizing aromatic compounds containing eight carbon atoms |
FR2784686B1 (fr) | 1998-09-10 | 2001-02-23 | Inst Francais Du Petrole | Procede d'isomerisation des composes aromatiques a huit atomes de carbone en deux etapes successives et utilisant un catalyseur active |
US6051744A (en) * | 1998-12-17 | 2000-04-18 | Chevron Chemical Company Llc | Low pressure hydrodealkylation of ethylbenzene and xylene isomerization |
FR2795343B1 (fr) * | 1999-06-22 | 2001-08-03 | Inst Francais Du Petrole | Procede de pretraitement dans des conditions severes d'un catalyseur a base de zeolithe euo |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3293314A (en) * | 1965-03-04 | 1966-12-20 | Chevron Res | Equilibration of lower alkyl substituted aromatic hydrocarbons |
US3644200A (en) * | 1968-12-23 | 1972-02-22 | Union Oil Co | Ammoniated zeolite catalysts |
US3856873A (en) * | 1973-09-13 | 1974-12-24 | Mobil Oil Corp | Xylene isomerization |
US3856872A (en) * | 1973-09-13 | 1974-12-24 | Mobil Oil Corp | Xylene isomerization |
US3992466A (en) * | 1975-08-13 | 1976-11-16 | Mobil Oil Corporation | Hydrocarbon conversion |
DE2558035A1 (de) * | 1975-12-22 | 1977-06-23 | Mobil Oil Corp | Kombiniertes verfahren zur katalytischen umwandlung und hydrodealkylierung von kohlenwasserstoffen |
-
1978
- 1978-06-14 US US05/915,414 patent/US4158676A/en not_active Expired - Lifetime
- 1978-06-27 CA CA306,268A patent/CA1098918A/fr not_active Expired
- 1978-06-28 IN IN713/CAL/78A patent/IN149346B/en unknown
- 1978-07-05 EP EP78300119A patent/EP0000432B1/fr not_active Expired
- 1978-07-05 DE DE7878300119T patent/DE2862267D1/de not_active Expired
- 1978-07-06 MX MX787208U patent/MX4173E/es unknown
- 1978-07-07 AR AR272883A patent/AR223821A1/es active
- 1978-07-07 ZA ZA783919A patent/ZA783919B/xx unknown
- 1978-07-07 JP JP53082135A patent/JPS6024771B2/ja not_active Expired
- 1978-07-07 ES ES471561A patent/ES471561A1/es not_active Expired
- 1978-07-07 IT IT25466/78A patent/IT1109966B/it active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20190079385A (ko) * | 2017-12-27 | 2019-07-05 | 한화케미칼 주식회사 | 탄화수소 함유 용액 내의 방향족 함량의 측정 방법 |
Also Published As
Publication number | Publication date |
---|---|
JPS6024771B2 (ja) | 1985-06-14 |
IT7825466A0 (it) | 1978-07-07 |
US4158676A (en) | 1979-06-19 |
EP0000432A1 (fr) | 1979-01-24 |
IT1109966B (it) | 1985-12-23 |
IN149346B (fr) | 1981-10-31 |
CA1098918A (fr) | 1981-04-07 |
DE2862267D1 (en) | 1983-07-07 |
MX4173E (es) | 1982-01-15 |
ES471561A1 (es) | 1979-01-16 |
JPS5419921A (en) | 1979-02-15 |
ZA783919B (en) | 1980-02-27 |
AR223821A1 (es) | 1981-09-30 |
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