2 results about "Methyl nitrite" patented technology

Provided is a supported catalyst for preparing carbonates, such as dimethyl carbonate from methyl nitrite and carbon monoxide, including: (a) an active metal component of IUPAC groups 8 to 10; (b) a metal additive selected from at least one of groups 11, 12, 5, 6 and 7; and (c) a modified carrier treated with a non-metallic modifier selected from at least one of groups 15 to 17, wherein, the catalyst has one or more "acidic sites" between 0-500°C as analysed by the NH3-TPD method. The active metal component can be, e.g., rhodium or palladium; the metal additive can be, e.g., copper or zinc; the non-metallic modifier of the modified carrier can be, e.g. ammonia for alumina as carrier or orthophosphoric acid for a silica carrier.

This invention discloses a method for determining the concentration of soluble methyl nitrite based on a mass correction factor, belonging to the field of analytical chemistry. Using an organic compound that can be prepared as both a gaseous and liquid standard as a reference substance, the concentration of soluble methyl nitrite in the alcohol-containing liquid sample is obtained by measuring the relative mass correction factor of gaseous methyl nitrite with respect to the gaseous reference substance and combining this with the measured concentration of the liquid reference substance in the sample. This method can accurately determine the concentration of soluble methyl nitrite without requiring a standard sample, is simple to operate, has good repeatability, and provides accurate and stable results. It solves the problems of poor compatibility between conventional reference substances and alcohol-containing liquid sample matrices, as well as their volatility or hydrolysis, which lead to inaccurate quantification. This method enables the direct and accurate determination of the concentration of soluble methyl nitrite and can be used for the precise analysis of soluble methyl nitrite in alcohol-containing liquid systems in chemical production.