KR20160045117A - Method for manufacturing extrusion molding - Google Patents

Abstract

Provided is a method for producing an extrusion-molded article which can produce an extrusion-molded article with less unevenness in quality by simple manipulation. (1) a step of kneading a raw material powder, a liquid and a binder to produce a kneaded product; (2) a step of crushing the kneaded product to produce a crushed product; and (3) ) And a step of molding the shrunk material by using an extruder. When the inner diameter of the cylinder of the extruder of the step (3) is Dmm, the crushed product of the step (2) is crushed to a particle diameter of 80% by mass or more through which the sieve of the nominal size (D / ) Using a shredder.

Description

[0001] METHOD FOR MANUFACTURING EXTRUSION MOLDING [0002]

The present invention relates to a method for producing an extrusion molded article.

Generally, a catalyst, a catalyst carrier, a sorbent material, a drying material, a humidity control material, etc. are formed into a columnar or cylindrical shaped article having a diameter of 2 to 10 mm and a length of 2 to 20 mm, It is used in chemical processes using unit operations such as manipulation or chemical reaction. In order to produce a molded article such as a filler or a catalyst, an extrusion molding method is conventionally employed.

Patent Document 1 discloses a method of manufacturing a kneaded product which includes a primary molding step of primary molding a kneaded product and a secondary molding step of molding a primary molded product into a final shape by a piston molding machine, Is in the range of (P1-0.2) MPaG to (P1-8) MPaG.

Japanese Patent Application Laid-Open No. 2011-224482

At present, there is a demand for a manufacturing method of an extrusion molded article which can reduce the quality unevenness of a molded article by a simpler operation than the conventional method industrially.

For example, when filling a column with a predetermined volume or size, or filling a reaction tube having a predetermined volume or size, the catalyst needs to be charged with a predetermined amount of filler, catalyst, or the like. In particular, in the case of a multi-tube heat exchanger type reactor, it is necessary to fill the plurality of reaction tubes with the same catalyst amount, and from this viewpoint, stability of the filling density of the filler and catalyst becomes important factors.

An object of the present invention is to provide a method for producing an extrusion-molded article which can produce an extrusion-molded article with less unevenness in quality by a simple operation.

According to one aspect of the present invention, there is provided a method of manufacturing an extrusion-

(1) a step of kneading a raw material powder, a liquid and a binder to prepare a kneaded product,

(2) a step of crushing the kneaded product to produce a crushed product,

(3) a step of molding the shredded product using an extruder

And further,

The shredded product of step (2) is shredded to a particle diameter allowing a sieve having a nominal size (D / 2) mm to pass at least 80 mass%, when the inner diameter of the cylinder of the extruder of step (3) is Dmm.

According to another aspect of the present invention, there is provided a method of manufacturing an extrusion-

(1) a step of kneading a raw material powder, a liquid and a binder to prepare a kneaded product,

(2) a step of crushing the kneaded product to produce a crushed product,

(3) a step of molding the shredded product using an extruder

, And

And is pulverized in a step (2) using a pulverizing machine.

According to the present invention, there is provided a process for producing an extrusion-molded article which is capable of producing an extrusion-molded article with less unevenness in quality by a simple operation.

Examples of the raw material powder to be used in the production method of the present invention include a catalyst powder for producing methacrylic acid by vapor phase catalytic oxidation of methacrolein or a precursor powder thereof [Japanese Unexamined Patent Application Publication No. 2011-224482 (Patent Document 1) And the like.

According to the present invention, there is provided an extrusion-molded article comprising the steps of (1) kneading a raw material powder, a liquid and a binder to produce a kneaded product, (2) a step of crushing the kneaded product to produce a crushed product, and (3) A step of molding the shrunk material by using an extruder, and a step of drying the formed body obtained in the step (3).

(Step (1))

In the step (1), the raw material powder, the liquid and the binder are kneaded. The apparatus used for the kneading is not particularly limited, and examples thereof include a batch type kneader equipped with a twin-arm type stirring blade, a continuous type kneader such as an axial rotation reciprocating type or a self-cleaning type, Can be used. However, a batch type kneader is preferable in that kneading can be performed while confirming the state of the kneaded product. The end point of the kneading can be judged by visual observation or touch.

The liquid used in the step (1) is not particularly limited as long as it has a function of wetting the raw material powder, and examples thereof include water and alcohols having 1 to 4 carbon atoms such as methyl alcohol, ethyl alcohol, propyl alcohol, . These may be used alone or in combination of two or more. Among them, water and ethyl alcohol are preferable from the viewpoint of handling. In the present invention, the liquid refers to a compound which is liquid at room temperature and normal pressure (25 DEG C, 0.101 MPa).

The amount of the liquid to be used in the step (1) is appropriately selected depending on the kind and size of the raw material powder, the kind of liquid, and the like, but is preferably 10 to 80 parts by mass with respect to 100 parts by mass of the raw material powder to be kneaded.

When the amount of the liquid used is 10 parts by mass or more, extrusion molding can be performed more smoothly, so that the shape of the molded article is stabilized. On the other hand, when the amount of the liquid used is 80 parts by mass or less, the adhesiveness at the time of molding is reduced and the handling property is improved. The amount of the liquid to be used is more preferably 5 to 50 parts by mass, more preferably 10 to 45 parts by mass, and particularly preferably 15 to 40 parts by mass with respect to 100 parts by mass of the raw material powder to be kneaded.

The binder used in the step (1) is not particularly limited as long as it has a function of adhering the raw material powder. For example, as the organic binder, a polymer compound such as polyvinyl alcohol,? Glucan derivative,? . These may be used alone or in combination of two or more.

In the present invention, the? -Glucan derivative indicates that glucose among the polysaccharides composed of glucose is bound in the? -Type structure, and derivatives such as? 1-4 glucan,? 1-6 glucan and? 1-4 / 1-6 glucan are exemplified . Examples of such? -Glucan derivatives include amylose, glycogen, amylopectin, pullulan, dextrin, cyclodextrin and the like. These may be used alone or in combination of two or more.

In the present invention, the? -Glucan derivative indicates that glucose among the polysaccharides composed of glucose is bound in a? -Form structure, and? -1-4 glucan,? 1-3 glucan,? 1-6 glucan,? 1-3 / 1-6 glucan Can be exemplified. Examples of such β-glucan derivatives include cellulose derivatives such as methyl cellulose, ethyl cellulose, carboxymethyl cellulose, carboxymethyl cellulose sodium, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl methyl cellulose, Cellulose derivatives such as methyl cellulose, ethylhydroxy ethyl cellulose and hydroxypropyl cellulose, and? 1-3 glucans such as curdlan, laminaran, para-milon, carosu, pachyman and scleroglucan. These may be used alone or in combination of two or more.

The organic binder may be used in the form of crude or refined, but it is preferable that the content of metal impurities and ignition remainders be smaller in order to suppress the deterioration of the catalyst performance due to the metal as the impurity or the residue of ignition.

Examples of the inorganic binder include inorganic compounds such as conventionally known inorganic substances such as silica, alumina, silica-alumina, silicon carbide, titania, magnesia, graphite and diatomaceous earth, inorganic fibers such as ceramic balls, stainless steel, glass fibers, ceramic fibers, And the like. These may be used alone or in combination of two or more. Of course, it is also possible to use an organic binder and an inorganic binder in combination.

The method of mixing the raw material powder, the liquid and the binder is not particularly limited. Specifically, there may be exemplified a method in which the raw material powder and the binder are dry-mixed and the liquid is mixed, a method in which the binder is dissolved or dispersed in the liquid, and the raw material powder is mixed. Among them, a method in which raw material powder and binder are dry-mixed and liquid is mixed is preferable. In the case of a binder which can be obtained in a state in which it is dissolved or dispersed in a liquid, the amount of the liquid to be newly added for mixing with the raw material powder may be adjusted depending on the amount of the liquid contained in the binder.

The amount of the binder used in the step (1) is appropriately selected depending on the kind and size of the raw material powder, the kind of the liquid, and the like, but is usually 0.05 to 15 parts by mass, preferably 0.1 to 10 parts by mass, Mass part.

The processing capability of the kneading machine in the step (1), that is, the kneading machine is not particularly limited, but it is preferable that the sum of the maximum processing capability of the kneading machine is larger than the maximum processing capability of the extruder used in the step (3) Do. If the sum of the maximum processability of the kneader is larger than the maximum processable capacity of the extruder, it is possible to easily prevent the waiting time for supplying the raw material in the extruder used in the process (3). Therefore, when the waiting time occurs, the fluidity of the raw material remaining in the extruder is changed, and it is easily prevented that unevenness occurs between the newly supplied raw material. For this purpose, it is preferable to continuously supply the raw material if the continuous extruder is used, and it is preferable to supply the raw material so as not to cause waiting time for waiting for raw material injection in the case of the batch type extruder. It is desirable that the feasible capability is greater than the maximum processing capability of the equipment used in the process (3).

Here, the maximum process capability of an apparatus is the maximum value of the throughput [kg] per unit time [h] when the object is processed with the apparatus and the obtained quality specification is satisfied.

(Step (2))

In the step (2), the kneaded product obtained in the step (1) is crushed.

In the present invention, the pulverization means pulverizing the pulverized material to a particle diameter smaller than that of the pulverized material.

The method of crushing is not particularly limited, and examples thereof include a method of hand-crushing, and a method of crushing using a crusher or a loosening machine. Among these methods, a method of pulverizing using a pulverizing machine is preferable in that it can be pulverized to a desired grain size in a short time.

As the crusher, various methods such as a shearing type, an impact type, and a cutting type can be adopted. For example, a rotary mill type, a screw type, an auger type and the like are preferable. As a concrete example, a scraping type bale crusher, a biaxial rotating type crusher, a single screw type crusher or a screw auger type crusher manufactured by Ohara Iron Works Co., Ltd., a screw auger type manufactured by Kobel Co., A shredder, a first shaft shredder manufactured by Ise Shin-Etsu Co., Ltd., and a Delindh Mill shredder manufactured by Tokushu Works Co., Ltd.

In the present invention, the impregnated product is such that the impregnated product of the step (2) passes 80 mass% or more of the sieve having the nominal dimension (D / 2) mm when the inner diameter of the cylinder of the extruder of the step (3) It can be deconstructed. When the ratio of passing through the sieve having a nominal dimension (D / 2) mm of the shredded product is 80% by mass or more, it is easy to suppress the entrainment of air into the molded product at the time of extrusion molding and suppress the increase in quality unevenness of the extrusion molded product Do. The ratio of the shredded product passing through a sieve having a nominal dimension (D / 2) mm is preferably 85% by mass or more, and more preferably 90% by mass or more. On the other hand, in the present invention, the nominal dimension refers to the length (also referred to as the eye size) of one side of the mesh of the sieve.

In the case of using a pulverizer in the step (2), the processing ability is not particularly limited, but it is preferable that the sum of the maximum processing capability of the pulverizer used is larger than the maximum processing capability of the extruder used in the step (3). If the sum of the maximum processable capacity of the crusher used is larger than the maximum processable capacity of the extruder used in the process (3), it is possible to easily prevent the waiting time of the feed of the raw material from occurring in the extruder used in the process (3) have. Therefore, when the waiting time occurs, the fluidity of the raw material remaining in the extruder is changed, and it is easily prevented that unevenness occurs between the newly supplied raw material. Therefore, it is preferable that the sum of the maximum processable capacity of the crusher used in the process (2) is larger than the maximum processable capacity of the extruder used in the process (3). In addition, it is preferable to continuously supply the raw material so as not to cause the waiting time for waiting for the feed of the raw material, if the continuous extruder is a batch type extruder.

When using an shredding in the step (2), to the power of the wedges is not particularly limited, to the power of the volume of the wedge 10kW / m ³ ~500kW / m ³ is preferable, and 50kW / m ³ ~400kW / m ³ is more preferable. When the power to the volume of the crusher is set to 10 kW / m ³ or more, it is easy to crush the kneaded product obtained in the step (1) well. On the other hand, in the present invention, the volume of the crusher means the volume of the crusher main body, which does not include the volume of the piping for supplying and discharging the raw material, and the raw material is crushed. It is the power of the motor used.

(Step (3))

In the step (3), the extrudate obtained in the step (2) is extrusion-molded to produce an extrusion-molded article. For example, an auger-type extruder, a plunger-type extruder, or the like can be used for extrusion molding. However, since it is easy to apply a suitable dough to the kneaded product and the performance of the formed catalyst is small, . The shape of the extrusion molded article is not particularly limited and may be any shape such as a ring shape, a cylindrical shape, or a star shape. The cylinder inner diameter D of the extruder is preferably 10 mm or more and 600 mm or less, preferably 20 mm or more and 400 mm or less, and more preferably 30 mm or more and 300 mm or less. Further, the L / D when the cylinder length is Lmm is preferably 1 or more and 20 or less, and more preferably 1.1 or more and 10 or less.

The shredding machine and the extrusion molding machine used in the steps (2) and (3) may be connected to each other, and the shredding operation and the molding operation may be continuously performed.

(Step (4))

In the step (4), the extrusion-molded article obtained in the step (3) is dried. The drying method is not particularly limited, and for example, generally known methods such as hot air drying, humidity drying, far infrared ray drying and microwave drying can be optionally used. The drying conditions can be suitably selected as long as the desired moisture content can be obtained.

(On catalyst)

The raw material powder may be a catalyst powder for producing an unsaturated carboxylic acid or a precursor powder thereof containing at least molybdenum and phosphorus, which are used when the unsaturated aldehyde is vapor-phase catalyzed oxidation by molecular oxygen to produce an unsaturated carboxylic acid.

In this case, for example, an extrusion-molded article of the catalyst is produced by the method of the present invention, and the extrusion-molded article is subjected to heat treatment to produce a catalyst for producing an unsaturated carboxylic acid. Particularly, when the unsaturated carboxylic acid is (meth) acrylic acid, it is possible to produce a catalyst for the production of (meth) acrylic acid, and the (meth) acrolein is gas- can do.

Further, the raw material powder may be obtained by subjecting propylene, isobutylene, primary butyl alcohol, tertiary butyl alcohol or methyl tertiary butyl ether to gas-phase catalytic oxidation with molecular oxygen to obtain the corresponding unsaturated aldehyde and unsaturated carboxylic acid An unsaturated aldehyde containing at least molybdenum and bismuth as a catalyst component and a catalyst powder for producing an unsaturated carboxylic acid or a precursor powder thereof may be used.

In this case, for example, an extruded article of the catalyst is produced by the method of the present invention, and the extruded article is subjected to a heat treatment to prepare a catalyst for producing an unsaturated aldehyde and an unsaturated carboxylic acid. In particular, in the case where the unsaturated aldehyde is (meth) acrolein and the unsaturated carboxylic acid is (meth) acrylic acid, a catalyst for the production of (meth) acrolein and (meth) acrylic acid can be prepared, and the catalyst can be used to produce propylene, isobutylene , (Meth) acrolein and (meth) acrylic acid can be prepared by gas-phase catalytic oxidation of primary, secondary, tertiary butyl alcohol, or methyl tertiary butyl ether with molecular oxygen.

In the case of producing a catalyst, it is preferable to sinter the extrusion molded article, but in the case where the sintered body is sintered before the extrusion molding, the sintering may be omitted. In the case where the calcination is omitted, the dried product of the catalyst compact is a catalyst, and in the case of heat treatment, the calcined product is a catalyst. The firing method is not particularly limited, and the firing method and conditions can be appropriately selected. The firing conditions vary depending on the raw material to be used, the composition of the catalyst component, the method of preparation, etc., but preferably 200 to 600 ° C for 0.5 hour or more under the flow of an oxygen-containing gas such as air or an inert gas. Herein, the inert gas refers to a gas which does not lower the reaction activity of the catalyst, and specifically includes nitrogen, carbon dioxide gas, helium, argon and the like. The firing may be carried out by using a heating device, but the catalyst molded product may be filled in a reactor and carried out therefrom.

Regarding the present invention, " heat treatment " may include either or both of a heat treatment for drying and a heat treatment for firing. A catalyst may be obtained by drying the extruded body by a heat treatment (without calcining), or the extruded body may be dried by a heat treatment, followed by calcination to obtain a catalyst.

Example

Hereinafter, the present invention will be described in detail with reference to examples and comparative examples, but the present invention is not limited to these examples.

In the examples and comparative examples, in the manual shredding, the kneaded product was recovered in a poly bag, and a portion hardened in a clay-like state was loosely released by hand.

The sieves of the kneaded materials in Examples and Comparative Examples were sieved by vibrating the sieve having a nominal size (D / 2) mm by hand and kneading the kneaded material at a speed that did not overlap with each other on the sieve.

The quality unevenness of the extrusion-molded article was determined 10 times from the standard deviation of the filling density of each formed article under the same molding conditions. The filling density was calculated from the mass X by filling a molded body having a diameter of 27 mm to a scale of 100 ml.

Packing density (g / L) = X x 10

"Parts" described in the examples and comparative examples mean "part by mass".

In the reaction evaluation described below, the analysis of the raw material gas and the product was carried out by gas chromatography. On the other hand, the methacrolein reaction rate, methacrylic acid selectivity and methacrylic acid yield are defined as follows.

Methacrolein reaction rate (%) = (B / A) x 100

Methacrylic acid selectivity (%) = (C / B) x 100

Methacrylic acid yield (%) = (C / A) x 100

Here, A is the number of moles of the supplied methacrolein, B is the number of moles of the reacted methacrolein, and C is the number of moles of the produced methacrylic acid.

[Examples 1 to 4 and Comparative Example 1]

In each of Examples 1 to 4 and Comparative Example 1, the following operations were carried out.

1000 parts of molybdenum trioxide, 34 parts of ammonium metavanadate, 80 parts of an 85% by mass aqueous phosphoric acid solution and 7 parts of copper nitrate were dissolved in 4000 parts of pure water, and the mixture was heated to 95 DEG C while being stirred, And stirred for 3 hours. After cooling to 90 deg. C, a solution prepared by dissolving 124 parts of cesium bicarbonate in 200 parts of pure water while stirring with a rotary blade stirrer was added and stirred for 15 minutes. Next, a solution prepared by dissolving 92 parts of ammonium carbonate in 200 parts of pure water was added, and the mixture was further stirred for 20 minutes. The mixed slurry containing the raw material compound of the catalyst component obtained as described above was dried by using a co-current type spray drier at a dryer inlet temperature of 300 캜 and a rotary disk for slurry spraying at 18,000 rpm.

3 parts of hydroxypropyl cellulose and 18 parts of ethyl alcohol were mixed with 100 parts of the raw material powder thus obtained, and kneaded with a batch type kneading machine equipped with a twin-roll type sigma blade until the mixture became a clay phase.

50 parts of the resultant kneaded product was crushed by a single-screw shaker or by hand and sieved using a sieve having a nominal size (D / 2) mm. Table 1 shows the breakage method, demolition time, the nominal dimension (D / 2) of the used body, and the ratio of the nominal dimension D / 2 of the demineralized body passed through the sieve.

Next, the crushed product obtained by combining the crushed product passed through the sieve and the crushed product not passed through the sieve was extruded by using a plunger type extruder and dried at 90 DEG C for 12 hours by a hot air drier to obtain an outer diameter of 5.5 mm and a length of 5.5 mm < / RTI > In order to eliminate the influence of the size of the molded body on the filling density, the outer shape and the length were both set to 5.5 mm. The same shrinkage product was extruded ten times, and the standard deviation of the filling density of the molded product was measured. Table 1 shows the ratio L / D of the cylinder length L to the cylinder inner diameter and the cylinder inner diameter D of the plunger extruder and the standard deviation of the filling density of the molded article.

On the other hand, the maximum capacity of the kneader used was 5.7 when the maximum processing capability of the extruder used was 1. Also, the maximum processing capability of the used crusher was 8.3 when the maximum processing capability of the extruder used was 1.

The power ratio to the volume of the crusher used was 92 kW / m ³ .

The obtained molded articles were all mixed and the reaction was evaluated under the following conditions.

This catalyst (extruded product) was charged into a stainless steel reaction tube having an outer diameter of 27.5 mm and a height of 6 m and having a heat transfer bath on the outside so that the catalyst filling length was 5 m. Next, the temperature of the heat bath provided outside the reaction tube was set to 370 占 폚 and heat treatment was performed for 10 hours while circulating air. Then, the temperature of the heat bath was set to 290 DEG C, and a reaction gas consisting of 6% by volume of methacrolein, 12% by volume of oxygen, 10% by volume of steam and 72% by volume of nitrogen was passed through the catalyst layer at a gas space velocity of 1200 ^{hr &} , A vapor phase catalytic oxidation reaction of methacrolein was carried out. The product after 24 hours from the initiation of the reaction was collected and analyzed by gas chromatography to determine the reaction rate of methacrolein, the selectivity of methacrylic acid, and the yield of methacrylic acid. The results are shown in Table 2.

[Comparative Examples 2 and 3]

A catalyst preform was produced in the same manner as in the procedures described in Examples 1 to 4 and Comparative Example 1 except that the kneaded product was directly supplied to the plunger type extruder without being shredded, The deviation was measured, and the gas phase catalytic oxidation reaction of methacrolein was also carried out. Conditions and results are shown in Tables 1 and 2.

Claims (16)

(1) a step of kneading a raw material powder, a liquid and a binder to prepare a kneaded product,
(2) a step of crushing the kneaded product to produce a crushed product,
(3) a step of molding the shredded product using an extruder
And further,
The method according to any one of (1) to (3), wherein the shredded product of the step (2) is crushed to a particle diameter of 80% by mass or more of a sieve having a nominal size (D / 2) mm when the inner diameter of the cylinder of the extruder of the step A method of manufacturing a molded article. (1) a step of kneading a raw material powder, a liquid and a binder to prepare a kneaded product,
(2) a step of crushing the kneaded product to produce a crushed product,
(3) a step of molding the shredded product using an extruder
And further,
A process for producing an extrusion-molded article, characterized in that the process (2) is carried out by using a pulverizer. 3. The method of claim 2,
It is preferable that the maximum possible processing capability of the apparatus for performing the kneading in the step (1) is larger than the maximum processing capability of the extruder used in the step (3), and the maximum possible processing capability of the pulverizer used in the step (2) Is larger than the maximum processable capacity of the extruder used in the step (3). The method according to claim 2 or 3,
In the above step (2) to the power of the volume of the wedge ratio of ^{10kW / m 3 ~500kW / m 3} , The method of the extrusion-molded article. 5. The method according to any one of claims 2 to 4,
In the step (2), any decentering machine such as a scraping type bale crusher, a biaxial rotating type crusher, a single screw type crusher, a screw auger type crusher, Of the extruded article. 6. The method according to any one of claims 1 to 5,
The method for producing an extrusion molded article according to any one of claims 1 to 3, wherein the step (3) is performed using a plunger type extruder. 7. The method according to any one of claims 1 to 6,
Wherein the cylinder inner diameter D of the extruder of the step (3) is 10 mm to 600 mm. 8. The method according to claim 6 or 7,
Wherein the ratio L / D of the cylinder length L to the cylinder inner diameter D of the extruder of the step (3) is 1 to 20. 9. The method according to any one of claims 1 to 8,
Wherein the raw material powder is a catalyst powder for producing an unsaturated carboxylic acid containing at least molybdenum and phosphorus, which is used for producing an unsaturated carboxylic acid by gas-phase catalytic oxidation of an unsaturated aldehyde by molecular oxygen, or a precursor powder thereof, A method of manufacturing a molded article. A process for producing an unsaturated carboxylic acid-containing catalyst, which comprises a step of producing an extrusion-molded article by the method according to claim 9 and heat-treating the extrusion-molded article. 11. The method of claim 10,
Wherein the unsaturated carboxylic acid is (meth) acrylic acid. 9. The method according to any one of claims 1 to 8,
Wherein the raw material powder is prepared by gas phase catalytic oxidation of propylene, isobutylene, primary butyl alcohol, tertiary butyl alcohol or methyl tertiary butyl ether with molecular oxygen to produce the corresponding unsaturated aldehyde and unsaturated carboxylic acid respectively Wherein the catalyst is a catalyst powder for preparing an unsaturated aldehyde and an unsaturated carboxylic acid containing at least molybdenum and bismuth as catalyst components, or a precursor powder thereof. A process for producing an unsaturated aldehyde and a catalyst for producing an unsaturated carboxylic acid, which comprises a step of producing an extruded product by the method according to claim 12 and heat-treating the extruded product. 14. The method of claim 13,
Wherein the unsaturated aldehyde is (meth) acrolein, and the unsaturated carboxylic acid is (meth) acrylic acid. A process for producing (meth) acrylic acid by preparing a catalyst for producing (meth) acrylic acid by the method according to claim 11 and producing (meth) acrylic acid by gas phase contact oxidation of (meth) acrolein with molecular oxygen using the catalyst, Gt; A process for producing (meth) acrolein and (meth) acrylic acid by the process according to claim 14, wherein the catalyst is used to produce propylene, isobutylene, primary butyl alcohol, tertiary butyl alcohol or methyl tertiary A process for producing (meth) acrolein and (meth) acrylic acid, wherein (meth) acrolein and (meth) acrylic acid are produced by gas phase catalytic oxidation of butyl ether with molecular oxygen.