Abstract: The present invention aims to provide a regeneration method capable of sufficiently restoring the catalytic performance of a solid catalyst used in a dehydration reaction of lactic acid and derivatives thereof. The present invention relates to a method for regenerating a solid catalyst used in a dehydration reaction of lactic acid and derivatives of lactic acid, the method including a contacting step of bringing a solid catalyst containing a component that forms a molten salt in the presence of steam into contact with oxygen and steam under pressure.

Abstract: The present invention aims to provide a regeneration method capable of sufficiently restoring the catalytic performance of a solid catalyst used in a dehydration reaction of lactic acid and derivatives thereof. The present invention relates to a method for regenerating a solid catalyst used in a dehydration reaction of lactic acid and derivatives of lactic acid, the method including a contacting step of bringing a solid catalyst containing a component that forms a molten salt in the presence of steam into contact with oxygen and steam under pressure.

Abstract: A process for producing acrolein, comprising: a glycerin dehydration step of conducting dehydration reaction of glycerin to obtain an acrolein-containing gas; a partial-condensation step of cooling the acrolein-containing gas to condense a part of acrolein, water and a high-boiling substance contained in the acrolein-containing gas, thereby obtaining a purified gas and a condensate; and a separation step of separating the purified gas from the condensate; wherein a polymerization inhibitor is added to the acrolein-containing gas or the condensate in the partial-condensation step.

Abstract: A process for producing acrolein, comprising: a glycerin dehydration step of conducting dehydration reaction of glycerin to obtain an acrolein-containing gas; a partial-condensation step of cooling the acrolein-containing gas to condense a part of acrolein, water and a high-boiling substance contained in the acrolein-containing gas, thereby obtaining a purified gas and a condensate; and a separation step of separating the purified gas from the condensate; wherein a polymerization inhibitor is added to the acrolein-containing gas or the condensate in the partial-condensation step.

Abstract: The present invention has an object to provide the following method for producing fatty acid alkyl esters and/or glycerin and the following catalyst used in the production method. According to the production method, a fat or oil is reacted with an alcohol to give a fatty acid alkyl ester and/or glycerin suitably used in a food or fuel application, etc., with high efficiency, and complicated steps such as a step of recovering a catalyst can be simplified or omitted. According to the catalyst, an active metal component is not eluted even if the catalyst is used repeatedly or for a long period of time, and further, such a catalyst can maintain an excellent catalyst activity for a long time even in the presence of water and exhibit a high activity to both of transesterification of a glyceride contained in the fat or oil and esterification of free fatty acid.

Abstract: In the method of the present invention for producing fatty acid alkyl ester and/or glycerin, as a heat source for an alcohol refining step of refining alcohol from unreacted alcohol that remains without reacting in a first reaction step, at least a part of heat of the unreacted alcohol is used. This allows reducing costs in production of fatty acid alkyl ester and/or glycerin over a solid catalyst.

Abstract: The present invention has an object to provide the following method for producing fatty acid alkyl esters and/or glycerin and the following catalyst used in the production method. According to the production method, a fat or oil is reacted with an alcohol to give a fatty acid alkyl ester and/or glycerin suitably used in a food or fuel application, etc., with high efficiency, and complicated steps such as a step of recovering a catalyst can be simplified or omitted. According to the catalyst, an active metal component is not eluted even if the catalyst is used repeatedly or for a long period of time, and further, such a catalyst can maintain an excellent catalyst activity for a long time even in the presence of water and exhibit a high activity to both of transesterification of a glyceride contained in the fat or oil and esterification of free fatty acid.

Abstract: The present invention provides a method of producing a fatty acid alkyl ester and/or glycerin by bringing an oil and an alcohol into contact with each other, the method including: reacting the oil and alcohol with each other; performing solid-liquid separation for removing a solid sterol from a reaction liquid obtained in the step of reacting; and performing phase separation for separating the reaction liquid into a hydrophobic phase and a hydrophilic phase after the reaction liquid is subjected to the step of performing the solid-liquid separation, the hydrophobic phase containing the fatty acid alkyl ester, and the hydrophilic phase containing glycerin. Thereby, the present invention provides a method allowing stable continuous operation for a long time period for production of a fatty acid alkyl ester and/or glycerin.

Abstract: In the method of the present invention for producing fatty acid alkyl ester and/or glycerin, as a heat source for an alcohol refining step of refining alcohol from unreacted alcohol that remains without reacting in a first reaction step, at least a part of heat of the unreacted alcohol is used. This allows reducing costs in production of fatty acid alkyl ester and/or glycerin over a solid catalyst.

Abstract: The method of producing fatty acid alkyl esters and/or glycerine of the present invention is a method of producing high-purity fatty acid alkyl esters and/or glycerine advantageously from the energy viewpoint while reducing the energy consumption of the production, and the products can be used in various fields of application, for example in biodiesel fuels, foods, cosmetics and pharmaceuticals.

Abstract: To provide: a production method using a catalyst which can substantially suppress leaching of active metal components and exhibit high activity for both reactions of transesterification of glycerides and esterification of free fatty acids each contained in a fat or oil; and the catalyst.

Abstract: The method of producing fatty acid alkyl esters and/or glycerine of the present invention is a method of producing high-purity fatty acid alkyl esters and/or glycerine advantageously from the energy viewpoint while reducing the energy consumption of the production, and the products can be used in various fields of application, for example in biodiesel fuels, foods, cosmetics and pharmaceuticals.

Abstract: A method for purifying glyoxylates includes (1) a coarse distillation process in which a crude glyoxylate in which water coexists is, in a film form, continuously subjected to coarse distillation, and (2) an azeotropic dehydration process in which the crude glyoxylate purified through the coarse distillation process is subjected to azeotropic dehydration in the presence of an azeotropic agent such as propyl acetate. By this method, high-purity glyoxylates can be efficiently and easily obtained at lower costs.