Acylation using molecular sieve SSZ-70

Molecular sieve abstract

The present invention relates to new crystalline molecular sieve SSZ-70 prepared using a N,N'-diisopropyl imidazolium cation as a structure-directing agent, methods for synthesizing SSZ-70 and processes employing SSZ-70 in a catalyst.

Molecular sieve claims

What is claimed is:

1. A method for performing an acylation reaction on an aromatic substrate ArH.sub.n to form a product ArH.sub.n-1COR, the method comprising the steps of: providing the aromatic substrate, intimately mixing the substrate and an acylating agent, wherein the acylating agent is selected from the group consisting of a carboxylic acid derivative, a carboxylic acid, an acid anhydride, an ester, and an acyl halide, and exposing an intimate mixture thus formed to a catalyst comprising a molecular sieve having a mole ratio greater than about 15 of (1) silicon oxide to (2) an oxide selected from aluminum oxide, gallium oxide, iron oxide, boron oxide, titanium oxide, vanadium oxide and mixtures thereof and having, after calcination, the X-ray diffraction lines of Table II.

2. The method of claim 1 wherein the organic substrate is selected from the group consisting of benzene, toluene, anisole and 2-naphthol.

3. The method of claim 2 wherein the organic substrate is anisole.

4. The method of claim 1 wherein the acylating agent is selected from the group consisting of carboxylic acid derivatives, carboxylic acids, acid anhydrides, esters, and acyl halides.

Molecular sieve description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to new crystalline molecular sieve SSZ-70 a method for preparing SSZ-70 using a N,N'-diisopropyl imidazolium cation as a structure directing agent and the use of SSZ-70 in catalysts for, e.g., hydrocarbon conversion reactions.

2. State of the Art

Because of their unique sieving characteristics, as well as their catalytic properties, crystalline molecular sieves and zeolites are especially useful in applications such as hydrocarbon conversion, gas drying and separation. Although many different crystalline molecular sieves have been disclosed, there is a continuing need for new zeolites with desirable properties for gas separation and drying, hydrocarbon and chemical conversions, and other applications. New zeolites may contain novel internal pore architectures, providing enhanced selectivities in these processes.

Crystalline aluminosilicates are usually prepared from aqueous reaction mixtures containing alkali or alkaline earth metal oxides, silica, and alumina. Crystalline borosilicates are usually prepared under similar reaction conditions except that boron is used in place of aluminum. By varying the synthesis conditions and the composition of the reaction mixture, different zeolites can often be formed.

SUMMARY OF THE INVENTION

The present invention is directed to a family of crystalline molecular sieves with unique properties, referred to herein as "molecular sieve SSZ-70" or simply "SSZ-70". Preferably, SSZ-70 is obtained in its silicate, aluminosilicate, titanosilicate, vanadosilicate or borosilicate form. The term "silicate" refers to a molecular sieve having a high mole ratio of silicon oxide relative to aluminum oxide, preferably a mole ratio greater than 100 including molecular sieves comprised entirely of silicon oxide. As used herein, the term "aluminosilicate" refers to a molecular sieve containing both aluminum oxide and silicon oxide and the term "borosilicate" refers to a molecular sieve containing oxides of both boron and silicon.

In accordance with this invention, there is provided a method for performing an acylation reaction on an aromatic substrate ArH.sub.n to form a product ArH.sub.n-1COR, the method comprising the steps of: providing the aromatic substrate, intimately mixing the substrate and an acylating agent, wherein the acylating agent is selected from the group consisting of a carboxylic acid derivative, a carboxylic acid, an acid anhydride, an ester, and an acyl halide, and exposing an intimate mixture thus formed to a catalyst comprising a molecular sieve having a mole ratio greater than about 15 of (1) silicon oxide to (2) an oxide selected from aluminum oxide, gallium oxide, iron oxide, boron oxide, titanium oxide, vanadium oxide and mixtures thereof and having, after calcination, the X-ray diffraction lines of Table II. It should be noted that the mole ratio of oxide (1) to oxide (2) can be infinity, i.e., there is no oxide (2) in the molecular sieve. In these cases, the molecular sieve is an essentially all-silica molecular sieve.

The present invention also includes the acylation reaction wherein the molecular sieve is predominantly in the hydrogen form, which hydrogen form is prepared by ion exchanging with an acid or with a solution of an ammonium salt followed by a second calcination. If the molecular sieve is synthesized with a high enough ratio of structure directing agent ("SDA") cation to sodium ion, calcination alone may be sufficient. For high catalytic activity, the SSZ-70 molecular sieve may be predominantly in its hydrogen ion form. As used herein, "predominantly in the hydrogen form" means that, after calcination, at least 80% of the cation sites are occupied by hydrogen ions and/or rare earth ions.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an X-ray diffraction pattern of SSZ-70 after it has been calcined.

FIG. 2 is an X-ray diffraction pattern of SSZ-70 in the as-synthesized form, i.e., prior to calcination with the SDA still in the pores of the SSZ-70.

DETAILED DESCRIPTION OF THE INVENTION

The present invention comprises a family of crystalline molecular sieves designated herein "molecular sieve SSZ-70" or simply "SSZ-70". In preparing SSZ-70 a N,N'-diisopropyl imidazolium cation (referred to herein as "DIPI") is used as a structure directing agent ("SDA"), also known as a crystallization template. The SDA useful for making SSZ-70 has the following structure:

##STR00001##

The SDA cation is associated with an anion (X.sup.-) which may be any anion that is not detrimental to the formation of the molecular sieve. Representative anions include halogen, e.g., fluoride, chloride, bromide and iodide, hydroxide, acetate, sulfate, tetrafluoroborate, carboxylate, and the like. Hydroxide is the most preferred anion.

SSZ-70 is prepared from a reaction mixture having the composition shown in Table A below.

TABLE-US-00001 TABLE A Reaction Mixture Typical Preferred YO.sub.2/B.sub.2O.sub.3 5 60 10 60 OH-/YO.sub.2 0.10 0.50 0.20 0.30 Q/YO.sub.2 0.05 0.50 0.10 0.20 M.sub.2/n/YO.sub.2 0 0.40 0.10 0.25 H.sub.2O/YO.sub.2 30 80 35 45 F/YO.sub.2 0 0.50 0

where Y is silicon; M is an alkali metal cation, alkaline earth metal cation or mixtures thereof; n is the valence of M (i.e., 1 or 2); F is fluorine and Q is a N,N'-diisopropyl imidazolium cation.

In practice, SSZ-70 is prepared by a process comprising:

(a) preparing an aqueous solution containing sources of at least two oxides capable of forming a crystalline molecular sieve and a DIPI cation having an anionic counterion which is not detrimental to the formation of SSZ-70;

(b) maintaining the aqueous solution under conditions sufficient to form crystals of SSZ-70; and

(c) recovering the crystals of SSZ-70.

Accordingly, SSZ-70 may comprise the crystalline material and the SDA in combination with metallic and non-metallic oxides bonded in tetrahedral coordination through shared oxygen atoms to form a cross-linked three dimensional crystal structure. Typical sources of silicon oxide include silicates, silica hydrogel, silicic acid, fumed silica, colloidal silica, tetra-alkyl orthosilicates, and silica hydroxides. Boron can be added in forms corresponding to its silicon counterpart, such as boric acid.

A source zeolite reagent may provide a source of boron. In most cases, the source zeolite also provides a source of silica. The source zeolite in its deboronated form may also be used as a source of silica, with additional silicon added using, for example, the conventional sources listed above. Use of a source zeolite reagent for the present process is more completely described in U.S. Pat. No. 5225179 issued Jul. 6 1993 to Nakagawa entitled "Method of Making Molecular Sieves", the disclosure of which is incorporated herein by reference.

Typically, an alkali metal hydroxide and/or an alkaline earth metal hydroxide, such as the hydroxide of sodium, potassium, lithium, cesium, rubidium, calcium, and magnesium, is used in the reaction mixture; however, this component can be omitted so long as the equivalent basicity is maintained. The SDA may be used to provide hydroxide ion. Thus, it may be beneficial to ion exchange, for example, the halide to hydroxide ion, thereby reducing or eliminating the alkali metal hydroxide quantity required. The alkali metal cation or alkaline earth cation may be part of the as-synthesized crystalline oxide material, in order to balance valence electron charges therein.

The reaction may also be carried out using HF to counterbalance the OH-contribution from the SDA, and run the synthesis in the absence of alkali cations. Running in the absence of alkali cations has the advantage of being able to prepare a catalyst from the synthesis product, by using calcination alone, i.e., no ion-exchange step (to remove alkali or alkaline earth cations) is necessary. In using HF, the reaction operates best when both the SDA and HF have mole ratios of 0.50 relative to YO.sub.2 (e.g., silica).

The reaction mixture is maintained at an elevated temperature until the crystals of the SSZ-70 are formed. The hydrothermal crystallization is usually conducted under autogenous pressure, at a temperature between 100.degree. C. and 200.degree. C., preferably between 135.degree. C. and 160.degree. C. The crystallization period is typically greater than 1 day and preferably from about 3 days to about 20 days.

Preferably, the molecular sieve is prepared using mild stirring or agitation.

During the hydrothermal crystallization step, the SSZ-70 crystals can be allowed to nucleate spontaneously from the reaction mixture. The use of SSZ-70 crystals as seed material can be advantageous in decreasing the time necessary for complete crystallization to occur. In addition, seeding can lead to an increased purity of the product obtained by promoting the nucleation and/or formation of SSZ-70 over any undesired phases. When used as seeds, SSZ-70 crystals are added in an amount between 0.1 and 10% of the weight of first tetravalent element oxide, e.g. silica, used in the reaction mixture.

Once the molecular sieve crystals have formed, the solid product is separated from the reaction mixture by standard mechanical separation techniques such as filtration. The crystals are water-washed and then dried, e.g., at 90.degree. C. to 150.degree. C. for from 8 to 24 hours, to obtain the as-synthesized SSZ-70 crystals. The drying step can be performed at atmospheric pressure or under vacuum.

SSZ-70 as prepared has a mole ratio of (1) silicon oxide to (2) boron oxide greater than about 15; and has, after calcination, the X-ray diffraction lines of Table II below. SSZ-70 further has a composition, as synthesized (i.e., prior to removal of the SDA from the SSZ-70) and in the anhydrous state, in terms of mole ratios, shown in Table B below.

TABLE-US-00002 TABLE B As-Synthesized SSZ-70 YO.sub.2/B.sub.2O.sub.3 20 60 M.sub.2/n/YO.sub.2 0 0.03 Q/YO.sub.2 0.02 0.05 F/YO.sub.2 0 0.10

where Y, M, n, F and Q are as defined above.

SSZ-70 can be an essentially all-silica material. As used herein, "essentially all-silica" means that the molecular sieve is comprised of only silicon oxide or is comprised of silicon oxide and only trace amounts of other oxides, such as aluminum oxide, which may be introduced as impurities in the source of silicon oxide. Thus, in a typical case where oxides of silicon and boron are used, SSZ-70 can be made essentially boron free, i.e., having a silica to boron oxide mole ratio of .infin.. SSZ-70 is made as a borosilicate and then the boron can then be removed, if desired, by treating the borosilicate SSZ-70 with acetic acid at elevated temperature (as described in Jones et al., Chem. Mater., 2001 13 1041 1050) to produce an essentially all-silica version of SSZ-70.

If desired, SSZ-70 can be made as a borosilicate and then the boron can be removed as described above and replaced with metal atoms by techniques known in the art. Aluminum, gallium, iron, titanium, vanadium and mixtures thereof can be added in this manner.

It is believed that SSZ-70 is comprised of a new framework structure or topology which is characterized by its X-ray diffraction pattern. SSZ-70 as-synthesized, has a crystalline structure whose X-ray powder diffraction pattern exhibit the characteristic lines shown in Table I and is thereby distinguished from other molecular sieves.

TABLE-US-00003 TABLE I As-Synthesized SSZ-70 2 Theta.sup.(a) d-spacing (Angstroms) Relative Intensity (%).sup.(b) 3.32 26.6 VS 6.70 13.2 VS 7.26 12.2 S 8.78 10.1 S 13.34 6.64 M 20.02 4.44 S 22.54 3.94 M 22.88 3.89 M 26.36 3.38 S VS 26.88 3.32 M .sup.(a).+-. 0.15 .sup.(b)The X-ray patterns provided are based on a relative intensity scale in which the strongest line in the X-ray pattern is assigned a value of 100: W(weak) is less than 20; M(medium) is between 20 and 40; S(strong) is between 40 and 60; VS(very strong) is greater than 60.

Table IA below shows the X-ray powder diffraction lines for as-synthesized SSZ-70 including actual relative intensities.

TABLE-US-00004 TABLE IA 2 Theta.sup.(a) d-spacing (Angstroms) Relative Intensity (%) 3.32 26.6 84 6.70 13.2 100 7.26 12.2 45 8.78 10.1 44 13.34 6.64 26 20.02 4.44 46 22.54 3.94 33 22.88 3.89 36 26.36 3.38 61 26.88 3.32 31 .sup.(a).+-. 0.15

After calcination, the SSZ-70 molecular sieves have a crystalline structure whose X-ray powder diffraction pattern include the characteristic lines shown in Table II:

TABLE-US-00005 TABLE II Calcined SSZ-70 2 Theta.sup.(a) d-spacing (Angstroms) Relative Intensity (%) 7.31 12.1 VS 7.75 11.4 VS 9.25 9.6 VS 14.56 6.08 VS 15.61 5.68 S 19.60 4.53 S 21.81 4.07 M 22.24 4.00 M S 26.30 3.39 VS 26.81 3.33 VS .sup.(a).+-. 0.15

Table IIA below shows the X-ray powder diffraction lines for calcined SSZ-70 including actual relative intensities.

TABLE-US-00006 TABLE IIA 2 Theta.sup.(a) d-spacing (Angstroms) Relative Intensity (%) 7.31 12.1 67 7.75 11.4 93 9.25 9.6 79 14.56 6.08 68 15.61 5.68 49 19.60 4.53 58 21.81 4.07 38 22.24 4.00 41 26.30 3.39 99 26.81 3.33 80 .sup.(a).+-. 0.15

The X-ray powder diffraction patterns were determined by standard techniques. The radiation was the K-alpha/doublet of copper. The peak heights and the positions, as a function of 2.theta. where .theta. is the Bragg angle, were read from the relative intensities of the peaks, and d, the interplanar spacing in Angstroms corresponding to the recorded lines, can be calculated.

The variation in the scattering angle (two theta) measurements, due to instrument error and to differences between individual samples, is estimated at .+-.0.15 degrees.

The X-ray diffraction pattern of Table I is representative of "as-synthesized" or "as-made" SSZ-70 molecular sieves. Minor variations in the diffraction pattern can result from variations in the silica-to-boron mole ratio of the particular sample due to changes in lattice constants. In addition, sufficiently small crystals will affect the shape and intensity of peaks, leading to significant peak broadening.

Representative peaks from the X-ray diffraction pattern of calcined SSZ-70 are shown in Table II. Calcination can also result in changes in the intensities of the peaks as compared to patterns of the "as-made" material, as well as minor shifts in the diffraction pattern. The molecular sieve produced by exchanging the metal or other cations present in the molecular sieve with various other cations (such as H.sup.+ or NH.sub.4.sup.+) yields essentially the same diffraction pattern, although again, there may be minor shifts in the interplanar spacing and variations in the relative intensities of the peaks. Notwithstanding these minor perturbations, the basic crystal lattice remains unchanged by these treatments.

Crystalline SSZ-70 can be used as-synthesized, but preferably will be thermally treated (calcined). Usually, it is desirable to remove the alkali metal cation by ion exchange and replace it with hydrogen, ammonium, or any desired metal ion. The molecular sieve can be leached with chelating agents, e.g., EDTA or dilute acid solutions, to increase the silica to alumina mole ratio. The molecular sieve can also be steamed; steaming helps stabilize the crystalline lattice to attack from acids.

The molecular sieve can be used in intimate combination with hydrogenating components, such as tungsten, vanadium, molybdenum, rhenium, nickel, cobalt, chromium, manganese, or a noble metal, such as palladium or platinum, for those applications in which a hydrogenation-dehydrogenation function is desired.

Metals may also be introduced into the molecular sieve by replacing some of the cations in the molecular sieve with metal cations via standard ion exchange techniques (see, for example, U.S. Pat. No. 3140249 issued Jul. 7 1964 to Plank et al.; U.S. Pat. No. 3140251 issued Jul. 7 1964 to Plank et al.; and U.S. Pat. No. 3140253 issued Jul. 7 1964 to Plank et al.). Typical replacing cations can include metal cations, e.g., rare earth, Group IA, Group IIA and Group VIII metals, as well as their mixtures. Of the replacing metallic cations, cations of metals such as rare earth, Mn, Ca, Mg, Zn, Cd, Pt, Pd, Ni, Co, Ti, Al, Sn, and Fe are particularly preferred.

The hydrogen, ammonium, and metal components can be ion-exchanged into the SSZ-70. The SSZ-70 can also be impregnated with the metals, or the metals can be physically and intimately admixed with the SSZ-70 using standard methods known to the art.

Typical ion-exchange techniques involve contacting the synthetic molecular sieve with a solution containing a salt of the desired replacing cation or cations. Although a wide variety of salts can be employed, chlorides and other halides, acetates, nitrates, and sulfates are particularly preferred. The molecular sieve is usually calcined prior to the ion-exchange procedure to remove the organic matter present in the channels and on the surface, since this results in a more effective ion exchange. Representative ion exchange techniques are disclosed in a wide variety of patents including U.S. Pat. No. 3140249 issued on Jul. 7 1964 to Plank et al.; U.S. Pat. No. 3140251 issued on Jul. 7 1964 to Plank et al.; and U.S. Pat. No. 3140253 issued on Jul. 7 1964 to Plank et al.

Following contact with the salt solution of the desired replacing cation, the molecular sieve is typically washed with water and dried at temperatures ranging from 65.degree. C. to about 200.degree. C. After washing, the molecular sieve can be calcined in air or inert gas at temperatures ranging from about 200.degree. C. to about 800.degree. C. for periods of time ranging from 1 to 48 hours, or more, to produce a catalytically active product especially useful in hydrocarbon conversion processes.

Regardless of the cations present in the synthesized form of SSZ-70 the spatial arrangement of the atoms which form the basic crystal lattice of the molecular sieve remains essentially unchanged.

SSZ-70 can be formed into a wide variety of physical shapes. Generally speaking, the molecular sieve can be in the form of a powder, a granule, or a molded product, such as extrudate having a particle size sufficient to pass through a 2-mesh (Tyler) screen and be retained on a 400-mesh (Tyler) screen. In cases where the catalyst is molded, such as by extrusion with an organic binder, the SSZ-70 can be extruded before drying, or, dried or partially dried and then extruded.

SSZ-70 can be composited with other materials resistant to the temperatures and other conditions employed in organic conversion processes. Such matrix materials include active and inactive materials and synthetic or naturally occurring zeolites as well as inorganic materials such as clays, silica and metal oxides. Examples of such materials and the manner in which they can be used are disclosed in U.S. Pat. No. 4910006 issued May 20 1990 to Zones et al., and U.S. Pat. No. 5316753 issued May 31 1994 to Nakagawa, both of which are incorporated by reference herein in their entirety.

The molecular sieve of the present invention can be used in a catalyst for acylating an aromatic substrate ArH.sub.n, where n is at least 1 by reacting the aromatic substrate with an acylating agent in the presence of the catalyst. The product of the acylation reaction is ArH.sub.n-1COR where R is an organic radical.

Examples of the aromatic substrate include, but are not limited to, benzene, toluene, anisole and 2-naphthol. Examples of the acylating agent included, but are not limited to, carboxylic acid derivatives, carboxylic acids, acid anhydrides, esters, and acyl halides.

Reaction conditions are known in the art (see, for example, U.S. Pat. No. 6630606 issued Oct. 7 2003 to Poliakoff et al., U.S. Pat. No. 6459000 issued Oct. 1 2002 to Choudhary et al., and U.S. Pat. No. 6548722 issued Apr. 15 2003 to Choudhary et al., all of which are incorporated herein by reference in their entirety). Typically, the acylation reaction is conducted with a weight ratio of the catalyst to the acylating agent of about 0.03 to about 0.5 a mole ratio of aromatic substrate to acylating agent of about 1.0 to about 20 a reaction temperature in the range of about 20.degree. C. to about 200.degree. C., a reaction pressure in the range of about 1 atm to about 5 atm, and a reaction time of about 0.05 hours to about 20 hours.