5 results about "Methyl nitrate" patented technology

The invention discloses a catalytic synthesis method of methyl nitrite, belongs to the technical field of methyl nitrite synthesis, and is used for solving the technical problem that the selectivity of catalytic synthesis of methyl nitrite in the prior art needs to be further improved. The catalytic synthesis method specifically comprises the following steps: adding lanthanum nitrate, copper nitrate, palladium chloride and deionized water into a beaker; the preparation method comprises the following steps: adding amino graphene and aluminum silica gel into a reaction kettle, stirring at room temperature for 10-20 minutes, adding ethylene glycol, continuously stirring for 15-30 minutes, adding a composite carrier into a system, adjusting the pH value to 3-4 by using saturated dilute nitric acid, heating to 50 DEG C, reacting for 12-15 hours, and performing post-treatment to obtain the modified catalyst. The reaction conversion rate, selectivity and catalyst stability are improved.

The invention discloses a mass correction factor-based soluble methyl nitrite content determination method and a mass correction factor-based soluble methyl nitrite content determination system, and belongs to the technical field of methyl nitrite content determination. According to the method, an alcohol substance is adopted as a reference substance, a reliable bridge is provided for indirect quantification, and the problems that a conventional reference substance is poor in compatibility and prone to volatilization or hydrolysis are solved; secondly, an indirect quantitative system of the gaseous correction factor and the liquid reference content is established, the content of the methyl nitrite can be accurately measured without a dissolved methyl nitrite standard sample for the first time, and the technical problem that direct quantification is difficult due to lack of a special liquid standard substance in the prior art is solved.

The invention discloses a method and a device for efficiently producing methyl nitrite. The method comprises the following steps: carrying out a reaction for generating methyl nitrite in a reaction chamber A to obtain a liquid-phase material, and transferring nitric acid out of the liquid-phase material in the reaction chamber A through an acid transfer concentration device; wherein the liquid-phase material after the nitric acid is transferred serves as a reaction raw material and is reused in the reaction chamber A; transferring the transferred nitric acid into a reaction chamber B; when the mass concentration of the nitric acid in the reaction chamber B is larger than or equal to a first set value, the reaction of converting the nitric acid into methyl nitrite is carried out in the reaction chamber B; when the mass concentration of the nitric acid in the reaction chamber B is less than or equal to a second set value, stopping the reaction for generating the methyl nitrite; the first set value is greater than the second set value. According to the device and the method, oxidative esterification and nitric acid conversion reaction can be simultaneously carried out, methyl nitrite is efficiently produced, the total space-time yield of the product is improved, and the process energy consumption and cost are reduced.

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.

The application discloses a preparation method of chlorophthalic acid, which comprises the following steps: contacting a raw material liquid containing chloro-o-xylene with an oxidant and an oxidation reaction catalyst, and generating an oxidation reaction to prepare the chlorophthalic acid; wherein the oxidant comprises methyl nitrite and oxygen. The method can fully utilize methyl nitrite, which is an important intermediate in a coal-to-ethylene glycol process. The methyl nitrite and the oxygen are used as the oxidant, so that the chloro-o-xylene can be efficiently oxidized to prepare the chlorophthalic acid under mild conditions.