The present invention relates to a method for regenerating a dicarboxylic acid or carboxylic acid hydrogenation catalyst, and more particularly, to a method for regenerating a hydrogenation catalyst to be used in a reaction of converting a dicarboxylic acid group into a diol group. The present invention provides an effect of regenerating a catalyst deactivated by the deposition of esters to be produced in a reaction of converting a dicarboxylic acid group into a diol group.

The invention has as its object a catalyst that comprises a substrate based on alumina or silica or silica-alumina, at least one element from group VIII, at least one element from group VIB, and an organic compound of formula (I) ##STR00001##
in which R1, R2, R3, R4 and R5 are selected from among a hydrogen atom, or a hydroxyl radical, or a hydrocarbon radical that comprises from 1 to 12 carbon atoms that can also comprise at least one oxygen atom, and R6 is selected from a hydrogen atom, a hydrocarbon radical that comprises from 1 to 12 carbon atoms that can also comprise at least one oxygen atom, a methacryloyl radical, an acryloyl radical or an acetyl radical. The invention also relates to the method for preparation of said catalyst and its use in a method for hydrotreatment and/or hydrocracking.

The invention has as its object a catalyst that comprises a substrate based on alumina or silica or silica-alumina, at least one element from group VIII, at least one element from group VIB, and an organic compound of formula (I) ##STR00001##
in which R1, R2, R3, R4 and R5 are selected from among a hydrogen atom, or a hydroxyl radical, or a hydrocarbon radical that comprises from 1 to 12 carbon atoms that can also comprise at least one oxygen atom, and R6 is selected from a hydrogen atom, a hydrocarbon radical that comprises from 1 to 12 carbon atoms that can also comprise at least one oxygen atom, a methacryloyl radical, an acryloyl radical or an acetyl radical. The invention also relates to the method for preparation of said catalyst and its use in a method for hydrotreatment and/or hydrocracking.

A process for the production of methyl acetate by carbonylating dimethyl ether with carbon monoxide at a temperature of 250 to 350 C. in the presence of a zeolite catalyst and hydrogen such that the molar ratio of hydrogen to carbon monoxide is at least 1, and one or more compounds containing a hydroxyl functional group and in the absence of any added methyl acetate.

A process for the production of methyl acetate by carbonylating dimethyl ether with carbon monoxide at a temperature of 250 to 350 C. in the presence of a zeolite catalyst and hydrogen such that the molar ratio of hydrogen to carbon monoxide is at least 1, and one or more compounds containing a hydroxyl functional group and in the absence of any added methyl acetate.

Embodiments provide a method for determining a chloride content of an alumina-based catalyst used for catalytic reforming. The method includes the step of combining nitric acid, isopropanol, and the alumina-based catalyst such that the alumina-based catalyst is dissolved in the nitric acid and the isopropanol to form a homogenized mixture. The alumina-based catalyst include chloride. The method includes the step of taking a conductivity measurement of the homogenized mixture using a pair of electrodes. The method includes the step of introducing a titrant solution comprising silver nitrate to the homogenized mixture such that a precipitate of silver chloride is formed. The method includes the step of determining a chloride concentration of the homogenized mixture based on the conductivity measurement of the homogenized mixture. The method includes the step of determining the chloride content of the alumina-based catalyst based on the chloride concentration of the homogenized mixture.

Embodiments provide a method for determining a chloride content of an alumina-based catalyst used for catalytic reforming. The method includes the step of combining nitric acid, isopropanol, and the alumina-based catalyst such that the alumina-based catalyst is dissolved in the nitric acid and the isopropanol to form a homogenized mixture. The alumina-based catalyst include chloride. The method includes the step of taking a conductivity measurement of the homogenized mixture using a pair of electrodes. The method includes the step of introducing a titrant solution comprising silver nitrate to the homogenized mixture such that a precipitate of silver chloride is formed. The method includes the step of determining a chloride concentration of the homogenized mixture based on the conductivity measurement of the homogenized mixture. The method includes the step of determining the chloride content of the alumina-based catalyst based on the chloride concentration of the homogenized mixture.

The invention has as its object a catalyst that comprises a substrate based on alumina or silica or silica-alumina, at least one element from group VIII, at least one element from group VIB, and at least one additive that is selected from among 2-acetylbutyrolactone and/or its hydrolysis products, 2-(2-hydroxyethyl)-3-oxobutanoic acid, and 3-hydroxy-2-(2-hydroxyethyl)-2-butenoic acid. The invention also relates to the method for preparation of said catalyst and its use in a method for hydrotreatment and/or hydrocracking.

The invention has as its object a catalyst that comprises a substrate based on alumina or silica or silica-alumina, at least one element from group VIII, at least one element from group VIB, and at least one additive that is selected from among 2-acetylbutyrolactone and/or its hydrolysis products, 2-(2-hydroxyethyl)-3-oxobutanoic acid, and 3-hydroxy-2-(2-hydroxyethyl)-2-butenoic acid. The invention also relates to the method for preparation of said catalyst and its use in a method for hydrotreatment and/or hydrocracking.

A method for separating a homogeneous catalyst from a solution includes forming a host-guest compound between a first isomer of the catalyst and inclusion compound in the solution and isolating the host-guest compound from the solution. The catalyst may be released from the inclusion compound by converting the first isomer of the catalyst to a second isomer of the catalyst.