JPH09187658A - Catalyst for converting aromatic hydrocarbon compound and converting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a catalyst, which is suitable for allowing benzene to react with a >=9C aromatic hydrocarbon compound to convert to toluene useful as a gasoline base material and an 8C aromatic hydrocarbon compound and has high activity, small deterioration of catalyst and high selectivity, and the converting method. SOLUTION: Benzene and the >=9C aromatic hydrocarbon compound in a raw material oil having a specific b.p. range are converted to toluene and the 8C aromatic hydrocarbon compound by using the catalyst prepared by carrying a metal or its compound selected from group VIII metals and group VIA metals in Periodic table on a carrier containing zeolite having 0.6-1.0nm max. narrow pore diameter of micro narrow pore and the SiO2 /Al2 O3 ratio of <50.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a catalyst for conversion of aromatic hydrocarbon compounds, and more specifically, to reacting these compounds by reacting benzene with an aromatic hydrocarbon compound having 9 or more carbon atoms. The present invention relates to a catalyst suitable for conversion to toluene and aromatic hydrocarbon compounds having 8 carbon atoms, which are more useful as a gasoline base material. The present invention also relates to a method for converting an aromatic hydrocarbon compound, more specifically, benzene and a carbon number 9
The present invention relates to a method suitable for converting these compounds into toluene and an aromatic hydrocarbon compound having 8 carbon atoms, which are more useful as a gasoline base material, by reacting the above aromatic hydrocarbon compounds.

[0002]

2. Description of the Related Art Aromatic hydrocarbon compounds contained in a gasoline base material are generally excellent as a gasoline base material in that they have a high octane number and a large calorific value. Further, among these, toluene and aromatic hydrocarbon compounds having 8 carbon atoms have a high octane number and excellent drivability, and it is desired to increase the content thereof. Particularly, a method of directly converting benzene and an aromatic hydrocarbon compound having 9 or more carbon atoms in a gasoline fraction into toluene and an aromatic hydrocarbon compound having 8 carbon atoms is significant.

The reaction of reacting aromatic hydrocarbon compounds with each other to convert them into aromatic hydrocarbon compounds having different carbon numbers includes a transalkylation reaction and a disproportionation reaction of aromatic hydrocarbon compounds. The transalkylation reaction is a reaction using a plurality of different aromatic hydrocarbon compounds as reactants, and the disproportionation reaction of an aromatic hydrocarbon compound is a reaction of two molecules of the same aromatic hydrocarbon compound. A well known process for these reactions is the production of benzene and xylene by the disproportionation reaction of toluene.
Further, as an application of this reaction, there is a method in which an aromatic hydrocarbon compound having 9 or more carbon atoms is added to a raw material to cause a transalkylation reaction to increase the yield of xylene. However, in this process, it is necessary to use toluene, which is itself useful as a gasoline base material, instead of benzene as a raw material. In addition, a high-purity raw material is used for the purpose of synthesizing a chemical industrial raw material, and other compounds, particularly a gasoline fraction which is a mixture of various hydrocarbon compounds including an aliphatic hydrocarbon compound, is used as a raw material. Nothing was considered about it.

US Pat. No. 5,347,061 discloses a method of directly converting benzene and an aromatic hydrocarbon compound having 9 or more carbon atoms in a gasoline fraction into toluene and an aromatic hydrocarbon compound having 8 carbon atoms. Is disclosed. this is,
A benzene-rich hydrocarbon compound fraction having a carbon number of 6 and obtained by distilling reformed gasoline, and a fraction of a mixture of an aromatic hydrocarbon compound having a carbon number of 9 or more and a non-aromatic hydrocarbon compound are treated with an acidic metallosilicate. In the presence of a catalyst, a transalkylation reaction, an alkylation reaction, and a decomposition reaction are caused,
The present invention relates to a process for producing toluene and an aromatic hydrocarbon compound having 8 carbon atoms. Zeolite catalysts such as ZSM-5 are exemplified as the acidic metallosilicate catalyst, but there is no detailed description about the pore size and metal loading.

[0005]

An object of the present invention is to react benzene with an aromatic hydrocarbon compound having 9 or more carbon atoms to make these compounds more useful as a gasoline base material in toluene and 8 carbon atoms. It is an object of the present invention to provide a catalyst which is suitable for conversion to an aromatic hydrocarbon compound, exhibits high activity, has little catalyst deterioration, and has high selectivity.
Another object of the present invention is to convert benzene and an aromatic hydrocarbon compound having 9 or more carbon atoms into toluene and an aromatic hydrocarbon compound having 8 carbon atoms, which are more useful as a gasoline base material. To provide a method.

[0006]

[Means for Solving the Problems] The inventors of the present invention directly react with benzene and an aromatic hydrocarbon compound having 9 or more carbon atoms to obtain a more preferable toluene and aromatic hydrocarbon having 8 carbon atoms as a gasoline base material. As a result of extensive research on new catalysts used for conversion to compounds, the results show that the maximum pore size of the micropores is large, and that the SiO ₂ / Al ₂ O ₃ ratio is specific to the zeolite-containing carrier. The present invention has been completed by finding that a catalyst supporting a metal exhibits a high activity when a feedstock oil having a specific boiling point range is used, and has a small catalyst deterioration and a high selectivity.

That is, the present invention provides a carrier containing a zeolite having a maximum micropore diameter of 0.6 to 1.0 nm and a SiO ₂ / Al ₂ O ₃ ratio of less than 50, in Periodic Table No. VIII.
At least one selected from Group 1 metals and Group VIA metals
A catalyst obtained by supporting a certain metal or a compound thereof, which comprises benzene and an aromatic hydrocarbon compound having 9 or more carbon atoms contained in a feed oil having a boiling range of 30 to 210 ° C in the presence of hydrogen. The present invention provides a catalyst for converting an aromatic hydrocarbon compound used in a method for converting toluene into an aromatic hydrocarbon compound having 8 carbon atoms.

The present invention also provides a carrier containing a zeolite having a maximum micropore diameter of 0.6 to 1.0 nm and a SiO ₂ / Al ₂ O ₃ ratio of less than 50, and a group VIII of the periodic table. Using a catalyst obtained by supporting at least one metal selected from metals and Group VIA metals or a compound thereof, benzene contained in a feed oil having a boiling range of 30 to 210 ° C in the presence of hydrogen. And a method for converting an aromatic hydrocarbon compound having 9 or more carbon atoms into toluene and an aromatic hydrocarbon compound having 8 carbon atoms. Hereinafter, the present invention will be described in detail.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The catalyst of the present invention has a maximum micropore diameter of 0.6 to 1.0 nm and an SiO ₂ / Al ₂ O ₃ ratio of 50.
The carrier containing zeolite which is less than
It is characterized in that at least one metal selected from Group III metals and Group VIA metals or a compound thereof is supported.

The pore structure of the porous catalyst material is generally a flow channel, macropores (pore diameter exceeding 50 nm), mesopores (pore diameter 2 to 50 nm), and micropores (pore diameter 2).
less than nm). In addition, the porous catalyst material,
Some have two or more kinds of micropores having different sizes, but in the present invention, the maximum pore size of the micropores means the pore entrance diameter of the largest of these micropores, This needs to be 0.6 to 1.0 nm. Further, in such micropores, the ring forming the pore inlet is usually composed of a 12-membered oxygen ring. In the following, in the present invention, when the pore is not a perfect circle but an ellipse, the major axis is the pore diameter.

The maximum pore size of the micropores of the zeolite used in the present invention is 0.6 to 1.0 nm, preferably 0.
It is necessary to be 6 to 0.8 nm. If it is less than 0.6 nm, the activity of the conversion reaction of benzene and the aromatic hydrocarbon compound having 9 or more carbon atoms into toluene and the aromatic hydrocarbon compound having 8 carbon atoms is lowered, and the reaction of the aliphatic hydrocarbon compound is reduced. It is not preferable because the selectivity of the decomposition reaction is increased. In particular, among aromatic hydrocarbon compounds having 9 or more carbon atoms, the conversion rate of trimethylbenzene is significantly reduced.

As the zeolite used in the present invention,
For example, mordenite, X-type zeolite, Y-type zeolite, offretite, β-type zeolite, L-type zeolite,
Examples include Ω-type zeolite, and among these, mordenite and Y-type zeolite are preferable, and mordenite is more preferable. These zeolites may be synthetic products or natural products. Further, in the present invention, one kind of zeolite may be used, or two or more kinds of zeolite may be used in combination as necessary.

Zeolite SiO ₂ / Al used in the present invention
_{The 2} O ₃ ratio (molar ratio) is less than 50. There is no limitation on the lower limit of the SiO ₂ / Al ₂ O ₃ ratio, but it is usually 2 or more,
It is preferably 4 or more, more preferably 10 or more, even more preferably 15 or more, even more preferably 20 or more, and most preferably 25 or more. SiO ₂
The / Al ₂ O ₃ ratio may be adjusted by appropriately adjusting the ratio of raw materials at the time of synthesis so as to obtain a desired value, if possible.
SiO ₂ / Al ₂ O ₃ ratio is to synthesize small zeolite may be subjected to dealumination by known methods, such as it steaming or acid treatment.

In general, zeolite has a negative charge in the crystal skeleton, and there is a counter cation that compensates for it. The counter cation of the zeolite used in the present invention is optional, but is preferably hydrogen ion or a mixture of hydrogen ion and alkali metal ion and / or alkaline earth metal ion, more preferably hydrogen ion and alkali metal ion and / or Mixtures with alkaline earth metal ions are preferred. The ratio of hydrogen ions to the total counter cations is preferably 20% or more, more preferably 30% or more, and most preferably 40 to 90% in terms of ion equivalent. The ratio of the alkali metal ion and / or the alkaline earth metal ion to the whole counter cation is preferably 80% or less, more preferably 70% or less, and particularly preferably 10 to 60% as an ion equivalent. Is desirable. As the counter cation, K ⁺ and Na ⁺ are preferable for the alkali metal ion, and Mg ²⁺ and Ca ²⁺ are preferable for the alkaline earth metal ion.

Alkali metal ions and / or
Alternatively, in order to prepare a zeolite having an alkaline earth metal ion as a counter cation, if the counter cation of the starting zeolite is almost a hydrogen ion, part of the hydrogen ion is an alkali metal ion and / or an alkaline earth ion. Obtained by exchanging with a metal ion. When the counter cations of the starting material zeolite are mostly alkali metal ions and / or alkaline earth metal ions, they may be exchanged for hydrogen ions so that some of these ions remain, and almost all of them are replaced with hydrogen ions. After exchanging with ions, it may be exchanged again with alkali metal ions and / or alkaline earth metal ions. In addition, in order to exchange the counter cations with hydrogen ions, a method of directly exchanging with hydrogen ions and a method of converting into ammonium ions after being exchanged with ammonium ions as is well known can be adopted.

When preparing the catalyst of the present invention, the order of supporting and molding the metal may be carried out first, but it is preferable to mold the carrier and then carry the metal. For molding, a commonly used molding method can be used. For example, extrusion molding, tablet molding, oil drop method and the like can be mentioned. Of these, extrusion molding is preferred. When molding, a binder may be used if necessary.

The binder is not particularly limited, and any of metal oxides such as alumina, titania and silica-alumina, and clay minerals can be used, but alumina, silica and clay minerals are preferable, and alumina is particularly preferable. . Moreover, you may use 2 or more types of binders as needed. Although the amount of the binder is not limited, it is preferably 5 to 50% by mass, more preferably 10 to 30% by mass based on the total amount of the carrier including the binder. If the amount of the binder used is too large, the catalytic performance will be deteriorated, and if the amount used is too small, molding may be difficult.

The metal supported on the catalyst used in the present invention is at least one metal selected from Group VIII metals and Group VIA metals of the Periodic Table. Periodic Table V
Group III metals are specifically Co, Fe, Ni, R
u, Rh, Pd, Os, Ir, and Pt. Co, Fe, Ni, Ru, Rh, Pd, Ir and Pt are preferable, Ni, Pd and Ir are more preferable, and Ni and Pd are particularly preferable. The Group VIA metal of the periodic table is specifically Cr, Mo, or W. Mo and W are preferable, and Mo is more preferable. These metals may be used alone or in combination of two or more.

The metal supporting method is not particularly limited, and a usual supporting method can be applied. For example, impregnation method, CVD (Che
medical vapor deposition) method,
Etc., but the impregnation method is preferable. Further, of the impregnation methods, the adsorption method, the ion exchange method, the evaporation dryness method, the incipient wetness method, and the spray method are preferable.

As the raw material of the metal to be supported, any commonly used one can be used. Examples include chlorides, nitrates, sulfates, and the like. Also Pd (NH ₃ ) ₄
Ammine complexes such as Cl ₂ and Pd (NH ₃ ) ₄ (NO ₃ ) can also be used. Further, in the catalyst used in the present invention, the metal may be supported as a metal atom, and may be supported as a compound such as a sulfide or an oxide, but among them from the viewpoint of the activity of the reaction, a metal atom or It is preferably supported as a sulfide.

The catalyst of the present invention comprises at least one metal selected from the Group VIII metals and the Group VIA metals of the Periodic Table supported on the above carrier,
When no metal is supported, the activity of the catalyst is lowered and the catalyst is easily deteriorated, which is not preferable.

The amount of such a metal supported is appropriately selected depending on the type of the metal and the reaction conditions and is not limited in any way, but Ru, in terms of metal, for each metal based on the total amount of the catalyst including the supported metal is Rh, Pd, Os, Ir,
0.01-5 mass% is preferable about Pt, and 0.0
5 to 3 mass% is more preferable, and 0.1 to 1 mass% is the most preferable. Regarding Co, Fe, Ni, Cr, Mo and W, 0.1 to 15 mass% is preferable, 0.3 to 10 mass% is more preferable, and 0.5 to 5 mass% is most preferable.

The catalyst of the present invention is preferably calcined after preparation. The firing temperature is usually 200 to 600 ° C, preferably 300 to 500 ° C. Further, it is preferable to perform reduction treatment or sulfurization treatment as a pretreatment before starting the reaction. Hydrogen reduction using a gas containing hydrogen is preferable for the reduction treatment, and the reduction temperature is usually 100 to 60.
The temperature is 0 ° C, preferably 200 to 500 ° C. Hydrogen sulfide, carbon disulfide, dimethyl disulfide (DM
It is preferable that the treatment is carried out in the presence of a gas containing hydrogen gas using a sulfiding agent such as DS), and the sulfiding temperature is preferably 100 to 500 ° C., more preferably 200 to 400.
° C.

With the catalyst of the present invention, a hydrogenation reaction of an aromatic ring, which is a side reaction, usually hardly occurs. However, this side reaction may become significant depending on the type of metal, reaction conditions, etc. In this case, it is more preferable to carry out a sulfurating treatment as a pretreatment.

In the present invention, the above-mentioned catalyst is
It is used in a method of converting benzene and an aromatic hydrocarbon compound having 9 or more carbon atoms contained in a feedstock having a boiling point range of 30 to 210 ° C. into toluene and an aromatic hydrocarbon compound having 8 carbon atoms.

In the present invention, the raw oil is AST
The boiling point range is 30 to 30 according to the measurement method specified in MD86.
A temperature of 210 ° C., preferably 30 to 200 ° C., more preferably 30 to 195 ° C. is used. Boiling point range is 21
If it exceeds 0 ° C, coking tends to occur,
It is not preferable because it may shorten the catalyst life.

The feedstock oil used in the present invention must satisfy the above boiling point range and contain benzene and an aromatic hydrocarbon compound having 9 or more carbon atoms. Here, the content of benzene and the aromatic hydrocarbon compound having 9 or more carbon atoms in the feed oil is arbitrary, but it is preferable that both of them are large from the viewpoint of reaction efficiency. In the present invention, the content of benzene is usually 1 based on the total amount of the feed oil.
Mass% or more, preferably 5 mass% or more, more preferably 10 mass% or more, and the content of the aromatic hydrocarbon compound having 9 or more carbon atoms is 1 mass% or more, preferably 30 mass% based on the total amount of the feed oil. Above, more preferably 50 mass%
That is all. Further, as the feedstock oil used in the present invention, the content of the aromatic hydrocarbon compound having 9 carbon atoms is 1% by mass or more, preferably 30% by mass or more, and more preferably 50% by mass or more based on the total amount of the starting material oil. Is desirable.

The ratio of the aromatic hydrocarbon compound having 9 or more carbon atoms to benzene in the feed oil (the number of moles of the aromatic hydrocarbon compound having 9 or more carbon atoms / the number of moles of benzene) is 0.5 to
The range of 10 is preferable, and the range of 1 to 5 is more preferable. If this ratio is too small, the conversion rate of benzene will decrease.
If this ratio is too large, the conversion rate of the aromatic hydrocarbon compound having 9 or more carbon atoms is lowered and it is not efficient. As the feedstock oil used in the present invention, any oil may be used as long as it satisfies the above boiling point range and contains benzene and an aromatic hydrocarbon compound having 9 or more carbon atoms.

Although such a raw material oil may be a pure product such as a raw material for chemical industry, the raw material oil used in the present invention is usually a mixture with other compounds, specifically, Examples include petroleum distillate oil obtained by distilling crude oil, and those obtained by subjecting petroleum distillate oil to various treatments. Among these, reformed gasoline obtained from the catalytic reforming device, catalytic cracking gasoline obtained from the fluid catalytic cracking device, and the like are preferably used, and reformed gasoline rich in aromatic components is particularly preferably used.

The above-mentioned mixture is usually a product of the reaction according to the present invention, ie, toluene and 8 carbon atoms.
Also included are aromatic hydrocarbon compounds. In the present invention,
Although the raw oil may contain these compounds as it is, it is preferable to remove these compounds by distillation or the like to obtain the raw oil from the viewpoint of reaction efficiency. That is, by distilling reformed gasoline and the like, a fraction containing benzene, a fraction containing toluene and an aromatic hydrocarbon compound having 8 carbon atoms, and a fraction containing an aromatic hydrocarbon compound having 9 or more carbon atoms. It is preferable that the raw material oil is obtained by separating the fraction containing benzene and the fraction containing the aromatic hydrocarbon compound having 9 or more carbon atoms. The toluene and the aromatic hydrocarbon compound having 8 carbon atoms removed here may be used as a gasoline base material or as a raw material for the chemical industry. If necessary, a benzene-containing fraction is separated by distillation or the like, and benzene having a high degree of purity separated by a known method such as sulfolane extraction is added to the benzene-containing aromatic hydrocarbon compound. You may use it as a raw material oil by mixing with the distillate.

When the conversion reaction of aromatic hydrocarbons is carried out using the catalyst of the present invention, it is necessary to carry out the reaction in the presence of hydrogen. In the present invention, the ratio of hydrogen gas and feedstock oil (0 ° C,
There is no particular limitation on the volume of hydrogen / volume of feedstock oil under standard conditions of 1 atm, but preferably 50 to 2000 Nm.
³ / m ³ , more preferably 500 to 1500 Nm ³ / m
A range of ³ is desirable. If the ratio of hydrogen gas to feedstock oil is too small, the catalyst life will be significantly shortened. It is not economical if the ratio of hydrogen gas and feedstock oil is too large.

When the catalyst of the present invention is used, it may be in the presence of hydrogen, and other reaction conditions are appropriately selected depending on the activity of the catalyst, the composition of the feed oil and the produced oil, and the reaction pressure. There is no limitation on reaction temperature, liquid space velocity, etc. However, the normal reaction pressure is 0.1-6MP
a, preferably in the range of 2 to 4 MPa. Also,
The reaction temperature is usually 200 to 550 ° C, preferably 250 to 500 ° C, more preferably 350 to 500 ° C.
Performed in the range of ° C. If the reaction temperature is too low, the conversion rate will decrease. If the reaction temperature is too high, the dealkylation reaction will occur preferentially and the conversion rate of benzene will decrease. The LHSV is preferably in the range of 0.1 to 10 ^-1, more preferably 0.5~5h ^-1.

In the present invention, the reactor type is a fixed bed,
Either a fluidized bed or an expanded bed may be used, but a fixed bed is preferred. The feed oil, hydrogen, and catalyst may be brought into contact with each other in any of parallel upflow, parallel downflow, and counterflow. The reaction may be carried out by either a flow method or a batch method, but the flow method is preferred.

In the process of the present invention, when benzene and an aromatic hydrocarbon compound having 9 or more carbon atoms are converted into toluene and an aromatic hydrocarbon compound having 8 carbon atoms, the conversion rate is high and the unconverted amount in the produced oil is high. The content of benzene and aromatic hydrocarbon compounds having 9 or more carbon atoms in the reaction is small. Therefore, it is not always necessary to mix the produced oil with the feedstock oil, recycle it, and react it again, but it may be recycled in order to increase the efficiency of the reaction. In the case of recycling, a part of the produced oil may be mixed with the raw material oil as it is, or only a specific fraction of the produced oil may be taken out by distillation and mixed with the raw material oil. Recycling of the benzene-containing fraction promotes the decomposition of coexisting aliphatic hydrocarbon compounds having 6 to 7 carbon atoms into lighter components of lower value, which reduces the yield as a gasoline base material. Therefore, it is preferable not to recycle when the benzene concentration in the produced oil is low.

FIG. 1 illustrates a simple example of a process for recycling using the catalyst of the present invention. The feedstock containing benzene and an aromatic hydrocarbon compound having 9 or more carbon atoms supplied from the conduit 1 contains an aromatic hydrocarbon compound having 9 or more carbon atoms which is recycled from the distillation tower (4) through the conduit 5. The distillate fraction is sent from the conduit 2 to the reactor (3). The produced oil is sent to the distillation tower (4) via the conduit 6,
From the conduit 7, a gas fraction, from the conduit 8 a fraction containing benzene, from the conduit 9 a fraction containing toluene and an aromatic hydrocarbon compound having 8 carbon atoms, and from the conduit 10 the aromatic hydrocarbon compound having 9 or more carbon atoms. At least a part of the fraction containing the aromatic hydrocarbon compound having 9 or more carbon atoms is recycled from the conduit 5 by being divided into the contained fractions.

FIG. 2 illustrates another preferred example of the process for recycling using the catalyst of the present invention. Conduit 1
The feed oil supplied from 1 is a fraction containing a benzene (conduit 13), a fraction containing toluene (conduit 14), and a fraction containing an aromatic hydrocarbon compound having 8 or more carbon atoms in a distillation tower (12). It is divided into minutes (conduit 15). The fraction containing the aromatic hydrocarbon compound having 8 or more carbon atoms (conduit 15 and conduit 24) is separated from the fraction containing the aromatic hydrocarbon compound having 8 carbon atoms (conduit 17) in the distillation column (16). After that, at least a part (conduit 18) of the fraction (conduit 18) containing the aromatic hydrocarbon compound having 9 or more carbon atoms together with the fraction (conduit 13) containing benzene in the reactor (20).
Sent to A fraction (conduit 23) containing benzene and toluene is separated from the produced oil (conduit 21) in a distillation column (22), and a fraction (conduit 24) containing an aromatic hydrocarbon compound having 8 or more carbon atoms is distilled. Sent to board (16).

[0037]

EXAMPLES The present invention will be described in more detail below with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.

Example 1 A hydrogen ion type mordenite [HSZ670HOA, Tosoh Corporation] having a maximum micropore diameter of 0.70 nm and a SiO ₂ / Al ₂ O ₃ ratio of 40 was added to
A catalyst carrier was prepared by adding boehmite peptized with dilute nitric acid, kneading, extruding, drying and firing. The amount of boehmite was adjusted so that the alumina binder was 30% by mass based on the total amount of the carrier. 3 mass% in terms of Ni metal using an aqueous solution of nickel nitrate as the carrier (based on the total amount of the catalyst)
Ni was supported by the Incipient wetness method, dried and calcined to prepare a catalyst. Then, before carrying out the reaction shown below, this catalyst was subjected to sulfurization treatment with hydrogen gas containing 1% by volume of hydrogen sulfide. A reaction experiment was conducted using a raw material oil having the properties and compositions shown in Table 1 using a pressure type flow reactor having a capacity of 20 ml. This feedstock is a mixture of benzene and a fraction (boiling point range 150 to 190 ° C.) mainly containing an aromatic hydrocarbon compound having 9 carbon atoms, which is obtained by distilling and reforming reformed gasoline obtained from a catalytic reformer. It is obtained by doing. The reaction conditions are pressure 3.0 MPa, temperature 390 ° C., LHSV 1.5 h ⁻¹ , hydrogen / oil ratio 800 Nm.
^It was carried out at a molar ratio of 1.9, which is ³ / m ³ and an aromatic hydrocarbon compound having 9 or more carbon atoms / benzene. Table 1 shows the reaction results 72 hours and 360 hours after the start of the reaction.

(Example 2) Instead of the hydrogen ion type mordenite having the maximum micropore diameter of 0.70 nm and the SiO ₂ / Al ₂ O ₃ ratio of 40 used in Example 1, this was replaced by the following. Catalyst preparation and reaction experiment were conducted in the same manner as in Example 1 except that the one that had undergone Na ion exchange was used. The results are shown in Table 1. (Na ion exchange method) Mordenite was placed in a NaCl aqueous solution, stirred at 80 ° C for 14 hours, filtered, and washed with ion exchanged water. Then, it dried and baked. The ion exchange rate was 50%.

(Example 3) Instead of the hydrogen ion type mordenite having the maximum pore size of 0.70 nm and the SiO ₂ / Al ₂ O ₃ ratio of 40 used in Example 1, the maximum number of the micropores was changed. Catalyst preparation and reaction experiment were carried out in the same manner as in Example 1 except that hydrogen ion type ultra-stable Y-type zeolite [HSZ370HUA, Tosoh Corp.] having a pore size of 0.74 nm and a SiO ₂ / Al ₂ O ₃ ratio of 26 was used. I went. The results are shown in Table 1.

(Comparative Example 1) In place of the feedstock oil used in Example 1, when distilling the reformed gasoline obtained from the catalytic reformer, the fraction containing the aromatic hydrocarbon compound having 9 carbon atoms was distilled. Catalyst preparation and reaction experiment were performed in the same manner as in Example 1 except that a mixture of a fraction having a boiling point range of 150 to 230 ° C. and pure benzene was used. Table 2 shows the results.

Comparative Example 2 Using the feedstock oil used in Example 1, the maximum pore size of the micropores used in Example 1 was 0.7.
The maximum pore diameter of the micropores is 0.54n in place of the hydrogen ion type mordenite having a thickness of 0 nm and a SiO ₂ / Al ₂ O ₃ ratio of 40.
m, a catalyst preparation and reaction experiment were performed in the same manner as in Example 1 except that hydrogen ion type ZSM-5 having a SiO ₂ / Al ₂ O ₃ ratio of 26 was used. The results are shown in Table 3.

COMPARATIVE EXAMPLE 3 Except that the feedstock oil used in Example 1 was used and the catalyst used in Example 1 was replaced by a catalyst having no metal loaded on the same catalyst carrier as in Example 1. A reaction experiment was conducted in the same manner as in Example 1. The results are shown in Table 3.

[0044]

[Table 1]

[0045]

[Table 2]

[0046]

[Table 3]

As is clear from the results of Tables 1 to 3, in the examples, the conversion rates of benzene and the aromatic hydrocarbon compound having 9 or more carbon atoms are high 72 hours after the start of the reaction, and 360 hours after the start of the reaction. It can be seen that the conversion rate is high and the deterioration of the catalyst is small. On the other hand, as is clear from Table 2, in Comparative Example 1 in which the feedstock oil having a boiling point range exceeding the range specified in the present invention was used, the conversion rate was particularly low after 360 hours, and the catalyst deterioration was large. Further, as is apparent from Table 3, in Comparative Example 2 in which the maximum pore size of the micropore size is less than 0.6 nm, the number of carbon atoms after 72 hours from the start of the reaction is 9
The conversion rate of the above aromatic hydrocarbon compounds is low, and especially the conversion rate of trimethylbenzene is small. Furthermore, the conversion rate after 360 hours from the start of the reaction is small, and the catalyst deterioration is large. Further, in Comparative Example 3 using a catalyst that does not support a metal,
The conversion rates of benzene and aromatic hydrocarbon compounds having 9 or more carbon atoms are extremely low.

[0048]

INDUSTRIAL APPLICABILITY The catalyst of the present invention reacts benzene with an aromatic hydrocarbon compound having 9 or more carbon atoms to make these compounds more useful as a gasoline base material in toluene and 8 carbon atoms.
It is suitable for the conversion to aromatic hydrocarbon compounds, and has high activity, small catalyst deterioration, and high selectivity. Further, according to the conversion method of the present invention, benzene and carbon number 9
By reacting the above aromatic hydrocarbon compounds, these compounds can be efficiently converted to toluene and aromatic hydrocarbon compounds having 8 carbon atoms, which are more useful as a gasoline base material.

[Brief description of the drawings]

FIG. 1 is a process chart for explaining a method for producing a gasoline base material using the catalyst of the present invention.

FIG. 2 is a process chart for explaining another method for producing a gasoline base material using the catalyst of the present invention.

[Explanation of symbols]

 1, 11 Raw material oil supply conduit 3, 20 Reaction tower 4, 12, 16, 22 Distillation tower

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location C07C 15/06 6958-4H C07C 15/06 15/067 6958-4H 15/067 // C07B 61 / 00 300 C07B 61/00 300 (72) Inventor Toshiyuki Enomoto 8 Chidoricho, Naka-ku, Yokohama-shi, Kanagawa Nippon Petroleum Co., Ltd. Central Technology Research Institute

Claims (2)

[Claims] 1. The maximum pore size of the micropores is 0.6 to 1.
A carrier containing zeolite having a thickness of 0 nm and a SiO ₂ / Al ₂ O ₃ ratio of less than 50 is added to a Group VIII metal and a V group of the periodic table.
A catalyst obtained by supporting at least one metal selected from Group IA metals or a compound thereof, which comprises benzene and aromatic carbonization having 9 or more carbon atoms contained in a feed oil having a boiling range of 30 to 210 ° C. A catalyst for conversion of an aromatic hydrocarbon compound used in a method of converting a hydrogen compound into toluene and an aromatic hydrocarbon compound having 8 carbon atoms in the presence of hydrogen. 2. The maximum pore size of the micropores is 0.6 to 1.
A carrier containing zeolite having a thickness of 0 nm and a SiO ₂ / Al ₂ O ₃ ratio of less than 50 is added to a Group VIII metal and a V group of the periodic table.
Using a catalyst obtained by supporting at least one metal selected from Group IA metals or a compound thereof, in the presence of hydrogen, benzene and the number of carbon atoms contained in the feed oil having a boiling range of 30 to 210 ° C. A conversion method comprising converting an aromatic hydrocarbon compound of 9 or more into toluene and an aromatic hydrocarbon compound having 8 carbon atoms.