Abstract: Disclosed are methods for dehydrating a water containing source of formaldehyde in which water is separated from the water containing source of formaldehyde using a zeolite membrane. In certain aspects, the water containing source of formaldehyde includes a separation enhancer having a relative static permittivity ranging from 2.5 to 20, and the water containing source of formaldehyde may further include methanol. In certain aspects, (meth)acrylic acid alkyl ester may be produced using the dehydrated source of formaldehyde.

Abstract: Disclosed are methods for dehydrating a water containing source of formaldehyde in which water is separated from the water containing source of formaldehyde using a zeolite membrane. In certain aspects, the water containing source of formaldehyde includes a separation enhancer having a relative static permittivity ranging from 2.5 to 20, and the water containing source of formaldehyde may further include methanol. In certain aspects, (meth)acrylic acid alkyl ester may be produced using the dehydrated source of formaldehyde.

Abstract: Disclosed are methods for dehydrating a water containing source of formaldehyde in which water is separated from the water containing source of formaldehyde using a zeolite membrane. In certain aspects, the water containing source of formaldehyde includes a separation enhancer having a relative static permittivity ranging from 2.5 to 20, and the water containing source of formaldehyde may further include methanol. In certain aspects, (meth)acrylic acid alkyl ester may be produced using the dehydrated source of formaldehyde.

Abstract: Disclosed are methods for dehydrating a water containing source of formaldehyde in which water is separated from the water containing source of formaldehyde using a zeolite membrane. In certain aspects, the water containing source of formaldehyde includes a separation enhancer having a relative static permittivity ranging from 2.5 to 20, and the water containing source of formaldehyde may further include methanol. In certain aspects, (meth)acrylic acid alkyl ester may be produced using the dehydrated source of formaldehyde.

Abstract: Disclosed is a palladium-containing catalyst which enables to produce an ?,?-unsaturated carboxylic acid in high selectivity from an olefin or an ?,?-unsaturated aldehyde. Also disclosed are a method for producing such a catalyst and a method for producing an ?,?-unsaturated carboxylic acid using such a catalyst. Specifically disclosed is a palladium-containing catalyst containing 0.001 to 0.25 mole of antimony element to 1 mole of palladium element or a palladium-containing catalyst containing palladium element which composes a metal, tellurium element, and bismuth element.

Abstract: Disclosed is a palladium-containing catalyst which enables to produce an ?,?-unsaturated carboxylic acid in high selectivity from an olefin or an ?,?-unsaturated aldehyde. Also disclosed are a method for producing such a catalyst and a method for producing an ?,?-unsaturated carboxylic acid using such a catalyst. Specifically disclosed is a palladium-containing catalyst containing 0.001 to 0.25 mole of antimony element to 1 mole of palladium element or a palladium-containing catalyst containing palladium element which composes a metal, tellurium element, and bismuth element.

Abstract: Disclosed is a palladium-containing catalyst which enables to produce an ?,?-unsaturated carboxylic acid in high selectivity from an olefin or an ?,?-unsaturated aldehyde. Also disclosed are a method for producing such a catalyst and a method for producing an ?,?-unsaturated carboxylic acid using such a catalyst. Specifically disclosed is a palladium-containing catalyst containing 0.001 to 0.25 mole of antimony element to 1 mole of palladium element or a palladium-containing catalyst containing palladium element which composes a metal, tellurium element, and bismuth element.

Abstract: The present invention provides: a palladium-containing supported catalyst which is used for producing an ?,?-unsaturated carboxylic acid from an olefin or an ?,?-unsaturated aldehyde in high selectivity; a method for manufacturing the catalyst; and a method for producing an ?,?-unsaturated carboxylic acid in high selectivity. In particular, the present invention resides in a method for manufacturing a palladium-containing supported catalyst for producing an ?,?-unsaturated carboxylic acid from an olefin or an ?,?-unsaturated aldehyde, comprising the step of reducing palladium oxide contained in a catalyst precursor wherein at least the palladium oxide is supported on a carrier. By using such a palladium-containing supported catalyst, an ?,?-unsaturated carboxylic acid is produced through liquid-phase oxidation of an olefin or an ?,?-unsaturated aldehyde with molecular oxygen.

Abstract: Disclosed is a method for producing an ?, ?-unsaturated carboxylic acid from an olefin or an ?, ?-unsaturated aldehyde, while suppressing dissolution of a silica carrier, which is a carrier for a silica-supported noble metal-containing catalyst, in a water-containing solvent. Specifically disclosed is a method for producing an ?, ?-unsaturated carboxylic acid through oxidation of an olefin or an ?, ?-unsaturated aldehyde in a water-containing solvent in the presence of a silica-supported noble metal-containing catalyst in a reactor, in which at least one of silicic acid and ions thereof is supplied into the reactor.

Abstract: Disclosed is a palladium-containing catalyst for producing an ?, ?-unsaturated carboxylic acid from an olefin or an ?, ?-unsaturated aldehyde in high productivity. Also disclosed are a method for producing such a catalyst, and a method for producing an ?, ?-unsaturated carboxylic acid in high productivity. Specifically, a palladium-containing catalyst is produced by a method containing a step in which palladium in an oxidation state is reduced by a compound (A) which is represented by the following formula (1).

Abstract: Disclosed is a palladium-containing catalyst which enables to produce an ?,?-unsaturated carboxylic acid in high selectivity from an olefin or an ?,?-unsaturated aldehyde. Also disclosed are a method for producing such a catalyst and a method for producing an ?,?-unsaturated carboxylic acid using such a catalyst. Specifically disclosed is a palladium-containing catalyst containing 0.001 to 0.25 mole of antimony element to 1 mole of palladium element or a palladium-containing catalyst containing palladium element which composes a metal, tellurium element, and bismuth element.

Abstract: Disclosed is a palladium-containing catalyst for producing an ?,?-unsaturated carboxylic acid from an olefin or an ?,?-unsaturated aldehyde in high productivity. Also disclosed are a method for producing such a catalyst, and a method for producing an ?,?-unsaturated carboxylic acid in high productivity. Specifically, a palladium-containing catalyst is produced by a method containing a step in which palladium in an oxidation state is reduced by a compound (A) which is represented by the following formula (1).

Abstract: Disclosed is a method for producing an ?, ?-unsaturated carboxylic acid from an olefin or an ?, ?-unsaturated aldehyde, while suppressing dissolution of a silica carrier, which is a carrier for a silica-supported noble metal-containing catalyst, in a water-containing solvent. Specifically disclosed is a method for producing an ?, ?-unsaturated carboxylic acid through oxidation of an olefin or an ?, ?-unsaturated aldehyde in a water-containing solvent in the presence of a silica-supported noble metal-containing catalyst in a reactor, in which at least one of silicic acid and ions thereof is supplied into the reactor.

Abstract: The object of the present invention is to provide a method for producing an ?,?-unsaturated carboxylic acid in higher selectivity. The present invention resides in a method for producing an ?,?-unsaturated carboxylic acid from an olefin or an ?,?-unsaturated aldehyde in liquid phase by using a noble metal-containing catalyst and by causing a compound (A) having an acid dissociation exponent (pKa) of less than 4 to be present in the liquid phase.

Abstract: Disclosed is a palladium-containing catalyst which enables to produce an ?,?-unsaturated carboxylic acid in high selectivity from an olefin or an ?,?-unsaturated aldehyde. Also disclosed are a method for producing such a catalyst and a method for producing an ?,?-unsaturated carboxylic acid using such a catalyst. Specifically disclosed is a palladium-containing catalyst containing 0.001 to 0.25 mole of antimony element to 1 mole of palladium element or a palladium-containing catalyst containing palladium element which composes a metal, tellurium element, and bismuth element.

Abstract: The present invention provides: a palladium-containing supported catalyst which is used for producing an ?,?-unsaturated carboxylic acid from an olefin or an ?,?-unsaturated aldehyde in high selectivity; a method for manufacturing the catalyst; and a method for producing an ?,?-unsaturated carboxylic acid in high selectivity. In particular, the present invention resides in a method for manufacturing a palladium-containing supported catalyst for producing an ?,?-unsaturated carboxylic acid from an olefin or an ?,?-unsaturated aldehyde, comprising the step of reducing palladium oxide contained in a catalyst precursor wherein at least the palladium oxide is supported on a carrier. By using such a palladium-containing supported catalyst, an ?,?-unsaturated carboxylic acid is produced through liquid-phase oxidation of an olefin or an ?,?-unsaturated aldehyde with molecular oxygen.

Abstract: The present invention provides: a palladium-containing catalyst which is used for highly selectively or highly productively producing an ?,?-unsaturated aldehyde and an ?,?-unsaturated carboxylic acid from an olefin or in that way producing an ?,?-unsaturated carboxylic acid from an ?,?-unsaturated aldehyde; a method for producing the catalyst; and a method for highly selectively or highly productively producing an ?,?-unsaturated aldehyde and an ?,?-unsaturated carboxylic acid from an olefin or in that way producing an ?,?-unsaturated carboxylic acid from an ?,?-unsaturated aldehyde. In particular, the present invention resides in a palladium-containing catalyst comprising 0.001 to 0.40 mole of tellurium metal to 1.0 mole of palladium metal. This catalyst can be preferably produced by a method having a step of reducing a compound containing palladium atom in its oxidized state and tellurium atom in its oxidized state by a reducing agent.

Abstract: The present invention provides a method for producing an ?,?-unsaturated carboxylic acid in high yield. In particular, the present invention resides in a method for producing an ?,?-unsaturated carboxylic acid by oxidation of an olefin or an ?,?-unsaturated aldehyde with molecular oxygen in liquid phase in the presence of a catalyst containing at least palladium, wherein at least one compound selected from the group consisting of p-methoxyphenol, 4,4?-dihydroxytetraphenylmethane, 1,1,1-tris(p-hydroxyphenyl)ethane, compounds having an N-oxyl group in the molecule and compounds having an N-nitrosyl group in the molecule is caused to be coexistent.

Abstract: The present invention provides: a palladium-containing catalyst which is used for highly selectively or highly productively producing an ?,?-unsaturated aldehyde and an ?,?-unsaturated carboxylic acid from an olefin or in that way producing an ?,?-unsaturated carboxylic acid from an ?,?-unsaturated aldehyde; a method for producing the catalyst; and a method for highly selectively or highly productively producing an ?,?-unsaturated aldehyde and an ?,?-unsaturated carboxylic acid from an olefin or in that way producing an ?,?-unsaturated carboxylic acid from an ?,?-unsaturated aldehyde. In particular, the present invention resides in a palladium-containing catalyst comprising 0.001 to 0.40 mole of tellurium metal to 1.0 mole of palladium metal. This catalyst can be preferably produced by a method having a step of reducing a compound containing palladium atom in its oxidized state and tellurium atom in its oxidized state by a reducing agent.

Abstract: The object of the present invention is to provide a method for producing an ?,?-unsaturated carboxylic acid in higher selectivity. The present invention resides in a method for producing an ?,?-unsaturated carboxylic acid from an olefin or an ?,?-unsaturated aldehyde in liquid phase by using a noble metal-containing catalyst and by causing a compound (A) having an acid dissociation exponent (pKa) of less than 4 to be present in the liquid phase.