The present invention relates to a method of removing nitrate compounds from solid adipic acid.

The present invention relates to a method of removing nitrate compounds from solid adipic acid.

The present invention relates to a method of removing nitrate compounds from solid adipic acid.

A method for producing a methanol precursor, methyl trifluoroacetate, having high-purity includes the steps of (a) preparing methyl bisulfate by mixing a catalyst with an acid solution comprising a sulfur-containing acid to provide a first mixture and supplying methane gas to the first mixture to prepare the methyl bisulfate; and (b) preparing methyl trifluoroacetate (CF.sub.3CO.sub.2CH.sub.3) by adding trifluoroacetic acid (CF.sub.3CO.sub.2H) to the first mixture including the methyl bisulfate to provide a second mixture and distilling the second mixture under heating to prepare, separate and purify the methyl trifluoroacetate (CF.sub.3CO.sub.2CH.sub.3). Methanol may be produced by adding water to the methyl trifluoroacetate (CF.sub.3CO.sub.2CH.sub.3). A methyl ester represented by Formula 2 below may be produced by adding a carboxylic acid represented by Formula 1 below to the methyl trifluoroacetate (CF.sub.3CO.sub.2CH.sub.3):
R.sub.1CO.sub.2H  (1), where R.sub.1 is selected from C.sub.1-C.sub.10 alkyl groups,
R.sub.1CO.sub.2CH.sub.3  (2), where R.sub.1 is as defined in Formula 1.

A method for producing a methanol precursor, methyl trifluoroacetate, having high-purity includes the steps of (a) preparing methyl bisulfate by mixing a catalyst with an acid solution comprising a sulfur-containing acid to provide a first mixture and supplying methane gas to the first mixture to prepare the methyl bisulfate; and (b) preparing methyl trifluoroacetate (CF.sub.3CO.sub.2CH.sub.3) by adding trifluoroacetic acid (CF.sub.3CO.sub.2H) to the first mixture including the methyl bisulfate to provide a second mixture and distilling the second mixture under heating to prepare, separate and purify the methyl trifluoroacetate (CF.sub.3CO.sub.2CH.sub.3). Methanol may be produced by adding water to the methyl trifluoroacetate (CF.sub.3CO.sub.2CH.sub.3). A methyl ester represented by Formula 2 below may be produced by adding a carboxylic acid represented by Formula 1 below to the methyl trifluoroacetate (CF.sub.3CO.sub.2CH.sub.3):
R.sub.1CO.sub.2H  (1), where R.sub.1 is selected from C.sub.1-C.sub.10 alkyl groups,
R.sub.1CO.sub.2CH.sub.3  (2), where R.sub.1 is as defined in Formula 1.

A method of reducing impurities in a catalyst for the production of purified terephthalic acid includes forming purified terephthalic acid by hydrogenating crude terephthalic acid with a catalyst in a reactor; separating the purified terephthalic acid from the catalyst and reactivating the catalyst by washing with a caustic solution; and flushing the catalyst contaminated with impurities with a non-caustic liquid at a flushing temperature of greater than or equal to 50 C.

A method of reducing impurities in a catalyst for the production of purified terephthalic acid includes forming purified terephthalic acid by hydrogenating crude terephthalic acid with a catalyst in a reactor; separating the purified terephthalic acid from the catalyst and reactivating the catalyst by washing with a caustic solution; and flushing the catalyst contaminated with impurities with a non-caustic liquid at a flushing temperature of greater than or equal to 50 C.

Reactor liquids, compositions, and methods of forming acetic acid, which may reduce catalyst loss. The reactor liquids and compositions may include, and the methods may use, a tri-aliphatic hydrocarbyl phosphine oxide. The carbonylation catalyst used in the methods may include rhodium. A composition comprising: acetic acid; water; and at least one tri-aliphatic hydrocarbyl phosphine oxide; wherein the acetic acid is present in the composition at an amount of about 60% to about 80%, by weight, based on the weight of the composition; wherein the water is present in the composition at an amount of about 0.1% to about 6%, by weight, based on the weight of the composition; and wherein the at least one tri-aliphatic hydrocarbyl phosphine oxide is present in the composition at an amount of about 2% to about 20%, by weight, based on the weight of the composition.

Reactor liquids, compositions, and methods of forming acetic acid, which may reduce catalyst loss. The reactor liquids and compositions may include, and the methods may use, a tri-aliphatic hydrocarbyl phosphine oxide. The carbonylation catalyst used in the methods may include rhodium. A composition comprising: acetic acid; water; and at least one tri-aliphatic hydrocarbyl phosphine oxide; wherein the acetic acid is present in the composition at an amount of about 60% to about 80%, by weight, based on the weight of the composition; wherein the water is present in the composition at an amount of about 0.1% to about 6%, by weight, based on the weight of the composition; and wherein the at least one tri-aliphatic hydrocarbyl phosphine oxide is present in the composition at an amount of about 2% to about 20%, by weight, based on the weight of the composition.

The present disclosure provides a process for producing trifluoroiodomethane, the process comprising providing a reactant stream comprising hydrogen iodide and at least one trifluoroacetyl halide selected from the group consisting of trifluoroacetyl chloride, trifluoroacetyl fluoride, trifluoroacetyl bromide, and combinations thereof, reacting the reactant stream in the presence of a first catalyst at a first reaction temperature from about 25 C. to about 400 C. to produce an intermediate product stream comprising trifluoroacetyl iodide, and reacting the intermediate product stream in the presence of a second catalyst at a second reaction temperature from about 200 C. to about 600 C. to produce a final product stream comprising the trifluoroiodomethane.