WO2009099043A1 - メタクリル酸製造用触媒およびその製造方法、並びにメタクリル酸の製造方法 - Google Patents
メタクリル酸製造用触媒およびその製造方法、並びにメタクリル酸の製造方法 Download PDFInfo
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- WO2009099043A1 WO2009099043A1 PCT/JP2009/051746 JP2009051746W WO2009099043A1 WO 2009099043 A1 WO2009099043 A1 WO 2009099043A1 JP 2009051746 W JP2009051746 W JP 2009051746W WO 2009099043 A1 WO2009099043 A1 WO 2009099043A1
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- catalyst
- methacrylic acid
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- organic binder
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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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
-
- 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
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/14—Phosphorus; Compounds thereof
- B01J27/186—Phosphorus; Compounds thereof with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J27/195—Phosphorus; Compounds thereof with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium with vanadium, niobium or tantalum
- B01J27/198—Vanadium
- B01J27/199—Vanadium with chromium, molybdenum, tungsten or polonium
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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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional [3D] monoliths
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
- C07C51/21—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen
- C07C51/23—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of oxygen-containing groups to carboxyl groups
- C07C51/235—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of oxygen-containing groups to carboxyl groups of —CHO groups or primary alcohol groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C57/00—Unsaturated compounds having carboxyl groups bound to acyclic carbon atoms
- C07C57/02—Unsaturated compounds having carboxyl groups bound to acyclic carbon atoms with only carbon-to-carbon double bonds as unsaturation
- C07C57/03—Monocarboxylic acids
- C07C57/04—Acrylic acid; Methacrylic acid
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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
- B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
- B01J37/0027—Powdering
- B01J37/0045—Drying a slurry, e.g. spray drying
Definitions
- the present invention relates to a catalyst used for producing methacrylic acid by vapor-phase catalytic oxidation of methacrolein with molecular oxygen (hereinafter referred to as catalyst for producing methacrylic acid), a production method thereof, and methacrylic acid using this catalyst.
- the present invention relates to a method for producing an acid.
- a heteropoly acid compound typified by phosphomolybdic acid is known as a catalyst component for producing methacrylic acid by vapor-phase catalytic oxidation of methacrolein with molecular oxygen.
- many methods for forming a pore structure in the catalyst have been proposed in order for this catalyst component to effectively act on the gas phase catalytic oxidation reaction.
- Patent Document 1 proposes a method for preparing a catalyst characterized in that a dry powder catalyst precursor is mixed with a carbonate compound powder having an average particle size of 0.1 to 100 ⁇ m, molded and then heat-treated.
- Patent Document 2 proposes that an organic substance such as polyvinyl alcohol is added at the time of molding the catalyst, and after heat treatment, it is used as a finished catalyst.
- Patent Document 3 proposes a method of forming by adding a polymer organic compound such as polymethyl methacrylate or polystyrene which decomposes into a monomer at a relatively low temperature and vaporizes and evaporates.
- Patent Document 4 proposes a method for producing a catalyst, characterized in that a mixed solution containing a catalyst component or a dry product of an aqueous slurry is molded using particles whose particle size is adjusted to a range of 1 to 250 ⁇ m. Has been.
- Patent Document 5 describes a method of adding an organic reducing substance to a mixed solution or slurry containing a raw material compound of a catalyst component for the purpose of reduction.
- JP-A-10-244160 JP-A-55-73347 Japanese Patent Laid-Open No. 04-367737 Japanese Patent Laid-Open No. 08-10621 JP 58-51943 A
- the present invention provides a catalyst for producing methacrylic acid, which can produce methacrylic acid in high yield by gas phase catalytic oxidation of methacrolein with molecular oxygen, a method for producing the catalyst, and a method for producing methacrylic acid using the catalyst.
- the purpose is to do.
- the present invention relates to a catalyst for producing methacrylic acid containing molybdenum and phosphorus as catalyst components, which is used for producing methacrylic acid by gas phase catalytic oxidation of methacrolein with molecular oxygen.
- Raw material for the catalyst component A step of adding an organic binder (B1) to a mixed solution or slurry containing a compound and then drying; (2) a step of kneading the obtained dried product, a liquid and an organic binder (B2); and (3) And a method for producing a methacrylic acid production catalyst obtained by extrusion, and a methacrylic acid production catalyst obtained by this method.
- the present invention is also a method for producing methacrylic acid, in which methacrolein is vapor-phase contact oxidized with molecular oxygen in the presence of the catalyst for producing methacrylic acid.
- the catalyst for methacrylic acid production which can produce methacrylic acid with high yield by vapor phase catalytic oxidation of methacrolein with molecular oxygen, the manufacturing method of the catalyst, and methacrylic acid can be produced with high yield
- a method for producing methacrylic acid can be provided.
- the catalyst of the present invention is a catalyst for producing methacrylic acid containing molybdenum and phosphorus as catalyst components, which is used in producing methacrylic acid by vapor-phase catalytic oxidation of methacrolein with molecular oxygen.
- the composition of the catalyst component constituting the catalyst of the present invention can be appropriately selected according to the target catalyst for methacrylic acid production.
- the catalyst for producing methacrylic acid which is an object of the present invention, is not particularly limited as long as it contains molybdenum and phosphorus as catalyst components, but preferably has a composition represented by the following formula (1). .
- P, Mo, V, Cu and O each represent phosphorus, molybdenum, vanadium, copper and oxygen
- X is at least one element selected from the group consisting of arsenic, antimony and tellurium
- Y is selected from the group consisting of bismuth, germanium, zirconium, silver, selenium, silicon, tungsten, boron, iron, zinc, chromium, magnesium, tantalum, cobalt, manganese, barium, gallium, cerium and lanthanum
- At least one element is represented
- Z represents at least one element selected from the group consisting of potassium, rubidium, and cesium.
- a, b, c, d, e, f, g and h represent atomic ratios of the respective elements.
- b 12
- a 0.1 to 3
- c 0.01 to 3
- d 0. 01 to 2
- e 0 to 3
- f 0 to 3
- g 0.01 to 3
- h is an atomic ratio of oxygen necessary to satisfy the valence of each element.
- the catalyst raw material used for the preparation of the mixed solution or slurry is not particularly limited, and it is used in combination with nitrate, carbonate, acetate, ammonium salt, oxide, halide, oxo acid, oxo acid salt, etc. of each constituent element of the catalyst. can do.
- the molybdenum raw material include molybdenum oxides such as molybdenum trioxide; and ammonium molybdates such as ammonium paramolybdate and ammonium dimolybdate.
- the phosphorus source compound include phosphoric acid, phosphorus pentoxide, and ammonium phosphate.
- vanadium raw material compound examples include ammonium metavanadate, vanadium pentoxide, and vanadyl oxalate.
- the raw material compound of the catalyst component may be used alone or in combination of two or more for each element constituting the catalyst component.
- Examples of the solvent to be used include water, ethyl alcohol, acetone and the like, but it is preferable to use water.
- the organic binder (B1) is added to the mixed solution or slurry.
- the organic binder (B1) added to the mixed solution or slurry is not particularly limited, and examples thereof include polymer compounds such as polyvinyl alcohol, ⁇ -glucan derivatives, and ⁇ -glucan derivatives.
- the polymer compound may have water solubility or water dispersibility.
- the liquid used in the step (2) is dissolved in the solvent of the mixed solution or slurry because the dried product does not collapse in the step (2) and it is easy to form pores effective for the oxidation reaction.
- An organic binder which does not dissolve or hardly dissolves is preferable.
- the solvent of the mixed solution or slurry is water
- the liquid used in the step (2) is ethyl alcohol
- it is hardly soluble or insoluble in ethyl alcohol and soluble in water.
- Methyl cellulose, polyvinyl alcohol and pullulan are preferred.
- “slightly soluble or insoluble” in the solvent means that the solubility in the solvent (the amount g dissolved in 100 g of the solvent at 20 ° C.) is 0 to 5, preferably 0 to 3, and more preferably 0 to 0.5. Is. Further, “soluble” in a solvent means that the solubility in a solvent (dissolved amount g in 100 g of a solvent at 20 ° C.) is greater than 5, preferably 8 or more.
- an ⁇ -glucan derivative refers to a polysaccharide composed of glucose in which glucose is bound in an ⁇ -type structure. ⁇ 1-4 glucan, ⁇ 1-6 glucan, ⁇ 1-4 / 1-6 glucan And the like.
- Examples of such ⁇ -glucan derivatives include amylose, glycogen, amylopectin, pullulan, dextrin, and cyclodextrin.
- a ⁇ -glucan derivative refers to a polysaccharide composed of glucose in which glucose is bound in a ⁇ -type structure.
- ⁇ -glucan derivatives examples include cellulose derivatives such as methylcellulose, ethylcellulose, carboxymethylcellulose, sodium carboxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, hydroxyethylmethylcellulose, hydroxybutylmethylcellulose, ethylhydroxyethylcellulose, and curdlan.
- ⁇ 1-3 glucan such as laminaran, paramylon, callose, pachyman, and scleroglucan.
- the type of the organic binder (B1) added to the mixed solution or slurry may be one type, or two or more types may be appropriately combined.
- the amount of the organic binder (B1) added to the mixed solution or slurry is preferably 0.1 to 20 parts by weight, more preferably 0.5 to 15 parts by weight, based on 100 parts by weight of the raw material compound as a solid content. More preferably, it is 8 to 10 parts by mass.
- the method for adding the organic binder (B1) to be added to the mixed solution or slurry is not particularly limited, and examples thereof include a method of directly adding and dissolving or dispersing in the mixed solution or slurry, a method of adding by dissolving or dispersing in a solvent, and the like. It is done.
- the method of dissolving or dispersing is not particularly limited, and the method of dispersing the organic binder (B1) in a high-temperature solvent and dissolving it at a low temperature, or conversely dispersing the organic binder (B1) in a low-temperature solvent and dissolving it at a high temperature. Methods and the like.
- the timing of addition is not particularly limited, and examples thereof include a method of adding during preparation of the mixed solution or slurry, a method of adding after preparation of the mixed solution or slurry, and the like.
- the method of drying is not particularly limited, and for example, a method of drying using a spray dryer, a method of drying using a slurry dryer, a method of drying using a drum dryer, a method of evaporating to dryness, etc. can be applied.
- a spray dryer since a particle
- the hot air temperature at the inlet of the dryer is preferably 200 to 400 ° C, more preferably 220 to 370 ° C.
- the average particle size of the obtained dry particles is preferably in the range of 1 to 250 ⁇ m.
- the average particle size is less than 1 ⁇ m, an appropriate pore size necessary for the oxidation reaction by the catalyst in the present invention cannot be obtained, and the yield of the reaction target product may be lowered.
- the average particle diameter of the dry particles exceeds 250 ⁇ m, the number of contact points between the dry particles per unit volume may decrease, and the mechanical strength of the catalyst may decrease.
- the average particle size of the dry particles is more preferably in the range of 5 to 150 ⁇ m.
- an average particle diameter means a volume average particle diameter, for example, can be measured with a laser type particle size distribution measuring apparatus.
- the contact method between the sprayed liquid droplets and the hot air may be any of parallel flow, counter flow, and co-current flow (mixed flow), and can be suitably dried in any case.
- the dried product obtained in the step (1) is kneaded with a mixture of at least a liquid and an organic binder (B2).
- the apparatus used for kneading is not particularly limited.
- a batch-type kneading machine using a double-arm type stirring blade, a continuous kneading machine such as a shaft rotation reciprocating type or a self-cleaning type can be used.
- the batch method is preferable because kneading can be performed while checking the state of the kneaded product.
- mixing can be judged by visual observation or a touch normally.
- the mixing method of the dried product, liquid, and organic binder (B2) is not particularly limited. Specifically, there are a method of mixing a dry product and an organic binder (B2) dry-mixed and a liquid, a method of dissolving or dispersing an organic binder (B2) in a liquid and a method of mixing a dry product, etc. Among them, a method in which a dry product and an organic binder (B2) are dry-mixed with a liquid is preferable.
- the liquid used in the step (2) is not particularly limited as long as it has a function of wetting the dried product obtained in the step (1).
- water methyl alcohol, ethyl alcohol, propyl alcohol, butyl alcohol, etc.
- lower alcohols having 1 to 4 carbon atoms.
- ethyl alcohol and propyl alcohol are preferable because the dried product does not collapse and it is easy to form pores effective for the oxidation reaction.
- the lower alcohol preferably has a high purity, but may contain a small amount of water.
- the amount of liquid used is appropriately selected according to the type and size of the dried product, the type of liquid, etc., but is usually 10 to 80 parts by mass with respect to 100 parts by mass of the dried product obtained in the step (1). is there.
- the amount of liquid used is preferably 40 parts by mass or more, more preferably 45 parts by mass or more with respect to 100 parts by mass of the dried product.
- the amount of liquid used is small, adhesion during molding is reduced and handling is improved.
- the amount of liquid used is preferably 70 parts by mass or less, and more preferably 65 parts by mass or less, with respect to 100 parts by mass of the dried product.
- the organic binder (B2) used in the step (2) is not particularly limited, and examples thereof include polymer compounds such as polyvinyl alcohol, ⁇ -glucan derivatives, and ⁇ -glucan derivatives. Among these, it is preferable that at least one kind of organic binder which is dissolved in the liquid used in the step (2) is contained because the strength of the molded body is improved.
- the liquid used in the step (2) is ethyl alcohol, it preferably contains an organic binder soluble in ethyl alcohol.
- the step (2) When the organic binder soluble in the liquid used in the step (2) and the organic binder not soluble in the liquid used in the step (2) are used in combination, out of the total amount of 100 parts by mass, the step (2)
- the organic binder soluble in the liquid used in 1 is preferably 10 to 95 parts by mass, more preferably 50 to 85 parts by mass.
- organic binder (B2) used in the step (2) hydroxypropylmethylcellulose is more preferable.
- the type of the organic binder (B2) used in the step (2) may be one type, or two or more types may be appropriately combined.
- the organic binder (B2) may be used unpurified or may be used after purification, but the metal as an impurity and the ignition residue may reduce catalyst performance, so the lesser Is preferred.
- the amount of the organic binder (B2) used in the step (2) is appropriately selected depending on the type and size of the dried product, the type of the liquid, etc., but usually the dried product 100 obtained in the step (1).
- the amount is 0.05 to 15 parts by mass, preferably 0.1 to 10 parts by mass with respect to parts by mass. As the amount of the organic binder (B2) added increases, the moldability tends to improve, and as the amount decreases, post-treatment such as heat treatment after molding tends to become easier.
- An inert carrier such as inorganic fiber can be added. The addition may be performed when kneading in the step (2).
- the kneaded product obtained in the step (2) is extruded.
- an auger type extruder or a piston type extruder can be used when extrusion molding is performed after kneading the dried material containing the raw material compound of the catalyst component, the organic binder (B2), and the liquid.
- the shape of the molded body by extrusion molding is not particularly limited, and for example, it can be molded into an arbitrary shape such as a ring shape, a cylindrical shape, or a star shape.
- the catalyst molded body obtained in the step (3) can be dried and calcined to obtain a catalyst (product).
- the drying method is not particularly limited, and for example, generally known methods such as hot air drying, humidity drying, far-infrared drying, or microwave drying can be arbitrarily used.
- the drying conditions can be appropriately selected as long as the desired moisture content can be achieved.
- the firing conditions are not particularly limited, and known firing conditions can be applied. Usually, it is carried out in a temperature range of 200 to 600 ° C. Usually, the calcination can be carried out at a temperature of 200 to 500 ° C., preferably 300 to 450 ° C. for 1 to 24 hours.
- the method for producing methacrylic acid of the present invention is a method for producing methacrylic acid by vapor-phase catalytic oxidation of methacrolein with molecular oxygen in the presence of the methacrylic acid production catalyst obtained as described above.
- the gas phase catalytic oxidation reaction is usually performed in a fixed bed.
- the catalyst layer is not particularly limited, and may be an undiluted layer containing only a catalyst, a diluted layer containing an inert carrier, or a single layer or a mixed layer composed of a plurality of layers.
- a raw material gas containing methacrolein and molecular oxygen it is preferable to use a raw material gas containing methacrolein and molecular oxygen.
- the concentration of methacrolein in the raw material gas can be varied within a wide range, but is preferably 1% by volume or more, and more preferably 3% by volume or more. Moreover, 20 volume% or less is preferable and 10 volume% or less is more preferable.
- the molecular oxygen concentration in the raw material gas is preferably 0.4 mol or more, more preferably 0.5 mol or more with respect to 1 mol of methacrolein. Moreover, 4 mol or less is preferable with respect to 1 mol of methacrolein, and 3 mol or less is more preferable. Although it is economical to use air as the molecular oxygen source, air or the like enriched with pure oxygen can also be used if necessary.
- the raw material gas preferably contains water (water vapor) in addition to methacrolein and molecular oxygen. By performing the reaction in the presence of water, methacrylic acid can be obtained in a higher yield.
- the concentration of water vapor in the raw material gas is preferably 0.1% by volume or more, and more preferably 1% by volume or more. Moreover, 50 volume% or less is preferable and 40 volume% or less is more preferable.
- the source gas may contain a small amount of impurities such as a lower saturated aldehyde, but the amount is preferably as small as possible.
- inert gas such as nitrogen and a carbon dioxide gas, may be included.
- the reaction pressure of the vapor phase catalytic oxidation reaction is preferably from normal pressure (atmospheric pressure) to 5 atm.
- the reaction temperature is preferably 230 ° C. or higher, more preferably 250 ° C. or higher. Moreover, 450 degrees C or less is preferable and 400 degrees C or less is more preferable.
- the flow rate of the raw material gas is not particularly limited, and can be appropriately set so as to have an appropriate contact time.
- the contact time is preferably 1.5 seconds or longer, and more preferably 2 seconds or longer. Moreover, 15 seconds or less are preferable and 10 seconds or less are more preferable.
- A is the number of moles of methacrolein supplied
- B is the number of moles of reacted methacrolein
- C is the number of moles of methacrylic acid produced.
- the solubility in ethyl alcohol was measured as follows. 50 parts of an organic binder was added to 500 parts of ethyl alcohol having a purity of 99.5% by mass and 20 ° C. while stirring so as not to cause maco and stirred for 1 hour. Thereafter, stirring was stopped and the mixture was allowed to stand for 8 hours to settle the insoluble part. 100 parts of a uniform solution of the obtained solution was dried at room temperature for 12 hours in a vacuum dryer, and the solubility in ethyl alcohol was calculated from the mass of the dried product as follows.
- D is the mass of the dried product
- E is the mass of the uniform solution minus the mass of the dried product.
- Example 1 In 400 parts of pure water, 100 parts of molybdenum trioxide, 3.1 parts of ammonium metavanadate, 7.3 parts of 85% by weight phosphoric acid aqueous solution and 1.1 parts of copper nitrate were dissolved, and the temperature was raised to 95 ° C. while stirring. The mixture was warmed and stirred for 3 hours while maintaining the liquid temperature at 95 ° C. After cooling to 40 ° C., a solution obtained by dissolving 13.5 parts of cesium bicarbonate in 20 parts of pure water was added while stirring using a rotary blade stirrer, and the mixture was stirred for 15 minutes. Next, a solution obtained by dissolving 11.6 parts of ammonium nitrate in 20 parts of pure water was added, and the mixture was further stirred for 20 minutes.
- hydroxypropylmethylcellulose having a solubility in ethyl alcohol of 10.
- 45 parts of ethyl alcohol was added and mixed here, mixed (kneaded) with a kneader until it was made into a clay, and then molded using a piston-type extrusion molding machine, outer diameter 6 mm, inner diameter 3 mm, average length 4 mm.
- a ring-shaped molded product was obtained.
- the molded body was dried at 60 ° C. for 16 hours, and then heat-treated at 380 ° C. for 5 hours under air flow to obtain a catalyst.
- the elemental composition other than oxygen (hereinafter the same) of the obtained catalyst was as follows.
- This catalyst is filled in a reaction tube, and a raw material gas of 5% by volume of methacrolein, 10% by volume of oxygen, 30% by volume of water vapor, and 55% by volume of nitrogen is reacted at a reaction temperature of 290 ° C., a reaction pressure of 1 atm (absolute pressure), and a contact time.
- the gas phase catalytic oxidation reaction of methacrolein was performed in 3.6 seconds.
- the product was collected and analyzed by gas chromatography to determine methacrolein reaction rate, methacrylic acid selectivity, and methacrylic acid yield. The results are shown in Table 1.
- Example 2 In Example 1, the same manner as in Example 1 except that the amount of pullulan added to the mixed slurry containing the raw material compound of the catalyst component was changed to 0.5 part with respect to 100 parts of the raw material compound as the solid content. Thus, a catalyst was prepared and a gas phase catalytic oxidation reaction of methacrolein was performed. The results are shown in Table 1.
- Example 3 In Example 1, except that the organic binder added to the mixed slurry containing the raw material compound of the catalyst component was changed from pullulan to polyvinyl alcohol (having a solubility in ethyl alcohol of 0.1), the same as in Example 1. A catalyst was produced and methacrolein was subjected to a gas phase catalytic oxidation reaction. The results are shown in Table 1.
- Example 4 the catalyst was the same as in Example 1 except that the organic binder added to the mixed slurry containing the raw material compound of the catalyst component was changed from pullulan to hydroxypropylmethylcellulose (having a solubility in ethyl alcohol of 10). The gas phase catalytic oxidation reaction of methacrolein was performed. The results are shown in Table 1.
- Example 1 In Example 1, except that pullulan was not added to the mixed slurry containing the raw material compound of the catalyst component, a catalyst was produced in the same manner as in Example 1, and a gas phase catalytic oxidation reaction of methacrolein was performed. The results are shown in Table 1.
- Example 5 In 400 parts of pure water, 100 parts of molybdenum trioxide, 3.4 parts of ammonium metavanadate, 7.3 parts of 85 mass% phosphoric acid aqueous solution, 7.5 parts of 60 mass% arsenic acid and 1.4 parts of copper nitrate were dissolved. The mixture was heated to 95 ° C. while stirring, and stirred for 3 hours while maintaining the liquid temperature at 95 ° C. After cooling to 50 ° C., 12.4 parts of cesium bicarbonate dissolved in 20 parts of pure water and 11.6 parts of ammonium nitrate dissolved in 20 parts of pure water were dissolved in 20 parts of pure water while stirring with a rotary blade stirrer. The solution was added and stirred for an additional 20 minutes.
- the molded body was dried at 60 ° C. for 16 hours, and then heat-treated at 380 ° C. for 10 hours under air flow to obtain a catalyst.
- the elemental composition other than oxygen (hereinafter the same) of the obtained catalyst was as follows.
- Example 5 was the same as Example 5 except that the amount of pullulan added to the mixed slurry containing the raw material compound of the catalyst component was changed to 0.5 part with respect to 100 parts of the raw material compound as the solid content. Thus, a catalyst was prepared and a gas phase catalytic oxidation reaction of methacrolein was performed. The results are shown in Table 2.
- Example 7 In Example 5, the same procedure as in Example 5 was performed except that the amount of pullulan added to the mixed slurry containing the raw material compound of the catalyst component was changed to 0.3 part with respect to 100 parts of the raw material compound as the solid content. Thus, a catalyst was prepared and a gas phase catalytic oxidation reaction of methacrolein was performed. The results are shown in Table 2.
- Example 5 was the same as Example 5 except that the amount of pullulan added to the mixed slurry containing the raw material compound of the catalyst component was changed to 0.1 part with respect to 100 parts of the raw material compound as the solid content.
- a catalyst was prepared and a gas phase catalytic oxidation reaction of methacrolein was performed. The results are shown in Table 2.
- Example 9 In Example 5, except that the organic binder added to the mixed slurry containing the raw material compound of the catalyst component was changed from pullulan to polyvinyl alcohol (having a solubility in ethyl alcohol of 0.1), the same as in Example 5. A catalyst was produced and methacrolein was subjected to a gas phase catalytic oxidation reaction. The results are shown in Table 2.
- Example 10 a catalyst was prepared in the same manner as in Example 5 except that the organic binder added to the mixed slurry containing the raw material compound of the catalyst component was changed from pullulan to methylcellulose (having a solubility in ethyl alcohol of 1.5). The gas phase catalytic oxidation reaction of methacrolein was performed. The results are shown in Table 2.
- Example 11 In Example 5, a catalyst was produced in the same manner as in Example 5 except that 50 parts of ethyl alcohol added during kneading was changed to 50 parts of propyl alcohol, and methacrolein was subjected to a gas phase catalytic oxidation reaction. The results are shown in Table 2.
- Example 12 In Example 5, a catalyst was prepared in the same manner as in Example 5 except that the organic binder added to the mixed slurry containing the raw material compound of the catalyst component was changed from pullulan to hydroxypropylmethylcellulose (having a solubility in ethyl alcohol of 10). The gas phase catalytic oxidation reaction of methacrolein was performed. The results are shown in Table 2.
- Example 13 A catalyst was produced in the same manner as in Example 5 except that hydroxypropylmethylcellulose mixed with the dry particles was changed to pullulan (having a solubility in ethyl alcohol of 0.1) in Example 5, and the gas phase of methacrolein was produced. A catalytic oxidation reaction was performed. The results are shown in Table 2.
- Example 14 In Example 5, a catalyst was produced in the same manner as in Example 5 except that 50 parts of ethyl alcohol added during kneading was changed to 50 parts of pure water, and methacrolein was subjected to a gas phase catalytic oxidation reaction. The results are shown in Table 2.
- Example 15 In Example 5, except that the drying method of the mixed slurry containing the raw material compound of the catalyst component and the organic binder was changed from drying using a co-current type spray dryer to drying using a drum dryer. Similarly, a catalyst was produced, and methacrolein was subjected to a gas phase catalytic oxidation reaction. The results are shown in Table 2.
- Example 2 (Comparative Example 2) In Example 5, a catalyst was produced in the same manner as in Example 5 except that pullulan was not added to the mixed slurry containing the raw material compound of the catalyst component, and a gas phase catalytic oxidation reaction of methacrolein was performed. The results are shown in Table 2.
- Example 5 (Comparative Example 3) In Example 5, a catalyst was produced in the same manner as in Example 5 except that hydroxypropylmethylcellulose and curdlan were not mixed in the dry particles, but the molded product extruded from the piston-type extrusion molding machine had a mass. In other words, it was impossible to obtain a molded body having a certain size.
- Example 5 (Comparative Example 4) In Example 5, a catalyst was produced in the same manner as Example 5 except that hydroxypropylmethylcellulose and curdlan were dry-mixed into dry particles, and then tableted and molded, and a gas phase catalytic oxidation reaction of methacrolein was performed. . The results are shown in Table 2.
- Example 5 a catalyst was produced in the same manner as in Example 5 except that the substance added to the mixed slurry containing the raw material compound of the catalyst component was changed from 2 parts of pullulan to 2 parts of ethylene glycol. A phase catalytic oxidation reaction was performed. The results are shown in Table 2.
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Abstract
Description
式(A)中、P、Mo、V、CuおよびOは、それぞれリン、モリブデン、バナジウム、銅および酸素を表し、Xは、砒素、アンチモンおよびテルルからなる群より選ばれた少なくとも1種類の元素を表し、Yは、ビスマス、ゲルマニウム、ジルコニウム、銀、セレン、ケイ素、タングステン、ホウ素、鉄、亜鉛、クロム、マグネシウム、タンタル、コバルト、マンガン、バリウム、ガリウム、セリウムおよびランタンからなる群より選ばれた少なくとも1種類の元素を表し、Zは、カリウム、ルビジウムおよびセシウムからなる群より選ばれた少なくとも1種類の元素を表す。a、b、c、d、e、f、gおよびhは各元素の原子比率を表し、b=12のとき、a=0.1~3、c=0.01~3、d=0.01~2、eは0~3、f=0~3、g=0.01~3であり、hは前記各元素の原子価を満足するのに必要な酸素の原子比率である。
メタクロレインの反応率(%)=(B/A)×100
メタクリル酸の選択率(%) =(C/B)×100
メタクリル酸の収率(%) =(C/A)×100
ここで、Aは供給したメタクロレインのモル数、Bは反応したメタクロレインのモル数、Cは生成したメタクリル酸のモル数である。
エチルアルコールに対する溶解度(エチルアルコール100gに対する溶解量g)=(D/E)×100
ここで、Dは乾燥物の質量、Eは均一溶液質量から乾燥物の質量を引いたものである。
純水400部に、三酸化モリブデン100部、メタバナジン酸アンモニウム3.1部、85質量%リン酸水溶液7.3部および硝酸銅1.1部を溶解し、これを攪拌しながら95℃に昇温し、液温を95℃に保ちつつ3時間攪拌した。40℃まで冷却後、回転翼攪拌機を用いて攪拌しながら、重炭酸セシウム13.5部を純水20部に溶解した溶液を添加し、15分間攪拌した。次いで、硝酸アンモニウム11.6部を純水20部に溶解した溶液を添加し、さらに20分間攪拌した。
この触媒を反応管に充填し、メタクロレイン5容量%、酸素10容量%、水蒸気30容量%、窒素55容量%の原料ガスを、反応温度290℃、反応圧力1気圧(絶対圧)、接触時間3.6秒で通じて、メタクロレインの気相接触酸化反応を行った。生成物を捕集し、ガスクロマトグラフィーで分析して、メタクロレインの反応率、メタクリル酸の選択率、およびメタクリル酸の収率を求めた。結果を表1に示す。
実施例1において、触媒成分の原料化合物を含有する混合スラリーに添加するプルランの量を、固形分としての原料化合物100部に対して0.5部に変更した以外は、実施例1と同様にして触媒を製造し、メタクロレインの気相接触酸化反応を行った。その結果を表1に示す。
実施例1において、触媒成分の原料化合物を含有する混合スラリーに添加する有機バインダーをプルランからポリビニルアルコール(エチルアルコールに対する溶解度が0.1のもの)に変更した以外は、実施例1と同様にして触媒を製造し、メタクロレインの気相接触酸化反応を行った。その結果を表1に示す。
実施例1において、触媒成分の原料化合物を含有する混合スラリーに添加する有機バインダーをプルランからヒドロキシプロピルメチルセルロース(エチルアルコールに対する溶解度が10のもの)に変更した以外は、実施例1と同様にして触媒を製造し、メタクロレインの気相接触酸化反応を行った。その結果を表1に示す。
実施例1において、触媒成分の原料化合物を含有する混合スラリーにプルランを添加しなかったこと以外は、実施例1と同様にして触媒を製造し、メタクロレインの気相接触酸化反応を行った。その結果を表1に示す。
純水400部に、三酸化モリブデン100部、メタバナジン酸アンモニウム3.4部、85質量%リン酸水溶液7.3部、60質量%ヒ酸7.5部および硝酸銅1.4部を溶解し、これを攪拌しながら95℃に昇温し、液温を95℃に保ちつつ3時間攪拌した。50℃まで冷却後、回転翼攪拌機を用いて攪拌しながら、純水20部に溶解した重炭酸セシウム12.4部および純水20部に溶解した硝酸アンモニウム11.6部を純水20部に溶解した溶液を添加し、さらに20分間攪拌した。
この触媒を反応管に充填し、メタクロレイン5容量%、酸素10容量%、水蒸気10容量%、窒素75容量%の原料ガスを、反応温度290℃、反応圧力1気圧(絶対圧)、接触時間4.0秒で通じて、メタクロレインの気相接触酸化反応を行った。生成物を捕集し、ガスクロマトグラフィーで分析して、メタクロレインの反応率、メタクリル酸の選択率、およびメタクリル酸の収率を求めた。結果を表2に示す。
実施例5において、触媒成分の原料化合物を含有する混合スラリーに添加するプルランの量を、固形分としての原料化合物100部に対して0.5部に変更した以外は、実施例5と同様にして触媒を製造し、メタクロレインの気相接触酸化反応を行った。その結果を表2に示す。
実施例5において、触媒成分の原料化合物を含有する混合スラリーに添加するプルランの量を、固形分としての原料化合物100部に対して0.3部に変更した以外は、実施例5と同様にして触媒を製造し、メタクロレインの気相接触酸化反応を行った。その結果を表2に示す。
実施例5において、触媒成分の原料化合物を含有する混合スラリーに添加するプルランの量を、固形分としての原料化合物100部に対して0.1部に変更した以外は、実施例5と同様にして触媒を製造し、メタクロレインの気相接触酸化反応を行った。その結果を表2に示す。
実施例5において、触媒成分の原料化合物を含有する混合スラリーに添加する有機バインダーをプルランからポリビニルアルコール(エチルアルコールに対する溶解度が0.1のもの)に変更した以外は、実施例5と同様にして触媒を製造し、メタクロレインの気相接触酸化反応を行った。その結果を表2に示す。
実施例5において、触媒成分の原料化合物を含有する混合スラリーに添加する有機バインダーをプルランからメチルセルロース(エチルアルコールに対する溶解度が1.5のもの)に変更した以外は、実施例5と同様にして触媒を製造し、メタクロレインの気相接触酸化反応を行った。その結果を表2に示す。
実施例5において、混練り時に添加するエチルアルコール50部をプロピルアルコール50部に変更した以外は、実施例5と同様にして触媒を製造し、メタクロレインの気相接触酸化反応を行った。その結果を表2に示す。
実施例5において、触媒成分の原料化合物を含有する混合スラリーに添加する有機バインダーをプルランからヒドロキシプロピルメチルセルロース(エチルアルコールに対する溶解度が10のもの)に変更した以外は、実施例5と同様にして触媒を製造し、メタクロレインの気相接触酸化反応を行った。その結果を表2に示す。
実施例5において、乾燥粒子に混合したヒドロキシプロピルメチルセルロースをプルラン(エチルアルコールに対する溶解度が0.1のもの)に変更した以外は、実施例5と同様にして触媒を製造し、メタクロレインの気相接触酸化反応を行った。その結果を表2に示す。
実施例5において、混練り時に添加するエチルアルコール50部を純水50部に変更した以外は、実施例5と同様にして触媒を製造し、メタクロレインの気相接触酸化反応を行った。その結果を表2に示す。
実施例5において、触媒成分の原料化合物と有機バインダーを含有する混合スラリーの乾燥方法を、並流式スプレー乾燥機を用いた乾燥からドラムドライヤーを用いた乾燥に変更した以外は、実施例5と同様にして触媒を製造し、メタクロレインの気相接触酸化反応を行った。その結果を表2に示す。
実施例5において、触媒成分の原料化合物を含有する混合スラリーにプルランを添加しなかったこと以外は、実施例5と同様にして触媒を製造し、メタクロレインの気相接触酸化反応を行った。その結果を表2に示す。
実施例5において、乾燥粒子にヒドロキシプロピルメチルセルロースとカードランを混合しなかったこと以外は、実施例5と同様にして触媒を製造したが、ピストン式押出し成形機から押出された成形体にまとまりが無く、一定寸の成形体を得ることができなかった。
実施例5において、乾燥粒子にヒドロキシプロピルメチルセルロースとカードランを乾式混合した後、打錠成形した以外は、実施例5と同様にして触媒を製造し、メタクロレインの気相接触酸化反応を行った。その結果を表2に示す。
実施例5において、触媒成分の原料化合物を含有する混合スラリーに添加する物質をプルラン2部からエチレングリコール2部に変更した以外は、実施例5と同様にして触媒を製造し、メタクロレインの気相接触酸化反応を行った。その結果を表2に示す。
Claims (11)
- メタクロレインを分子状酸素により気相接触酸化してメタクリル酸を製造する際に用いられる、モリブデンおよびリンを触媒成分として含むメタクリル酸製造用触媒において、
(1)該触媒成分の原料化合物を含む混合溶液またはスラリーに有機バインダー(B1)を添加した後、乾燥する工程と、
(2)得られた乾燥物と液体と有機バインダー(B2)とを混練りする工程と、
(3)得られた混練り品を押出し成形する工程と
を含むことを特徴とするメタクリル酸製造用触媒の製造方法。 - 前記有機バインダー(B1)および(B2)が、いずれも、高分子化合物、αグルカン誘導体、およびβグルカン誘導体からなる群より選択される請求項1に記載のメタクリル酸製造用触媒の製造方法。
- 前記有機バインダー(B1)が、前記液体に対し難溶または不溶であり、かつ、前記混合溶液またはスラリーの溶媒に可溶である請求項1または2に記載のメタクリル酸製造用触媒の製造方法。
- 前記有機バインダー(B1)が、プルラン、ポリビニルアルコール、およびメチルセルロースより選択される請求項3記載のメタクリル酸製造用触媒の製造方法。
- 前記有機バインダー(B2)の少なくとも1種が、前記液体に対し可溶である請求項1~4のいずれかに記載のメタクリル酸製造用触媒の製造方法。
- 前記液体が、水および炭素数が1~4のアルコールからなる群より選択される請求項1~5のいずれかに記載のメタクリル酸製造用触媒の製造方法。
- 前記液体が、炭素数が1~4のアルコールである請求項6に記載のメタクリル酸製造用触媒の製造方法。
- 前記液体が、エチルアルコールおよび/またはプロピルアルコールである請求項7に記載のメタクリル酸製造用触媒の製造方法。
- 前記(1)の工程において、スプレー乾燥機を用いて乾燥する請求項1~8のいずれかに記載のメタクリル酸製造用触媒の製造方法。
- 請求項1~9のいずれかに記載の製造方法により製造されたメタクリル酸製造用触媒。
- 請求項10に記載のメタクリル酸製造用触媒の存在下で、メタクロレインを分子状酸素により気相接触酸化するメタクリル酸の製造方法。
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| JP2012005973A (ja) * | 2010-06-25 | 2012-01-12 | Mitsubishi Rayon Co Ltd | メタクリル酸製造用触媒の製造方法 |
| JP2012030217A (ja) * | 2010-06-29 | 2012-02-16 | Mitsubishi Rayon Co Ltd | メタクリル酸製造用触媒およびその製造方法、ならびにメタクリル酸の製造方法 |
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| MY186658A (en) * | 2016-06-21 | 2021-08-04 | Mitsubishi Chem Corp | Method for producing methacrylic acid production catalyst, method for producing methacrylic acid, and method for producing methacrylic acid ester |
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| SG187497A1 (en) | 2013-02-28 |
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