35 results about "2-Hexanone" patented technology

The invention relates to a method for selectively determining residual vinyl acetate in white latex for cigarette through static headspace and gas chromatography mass spectrometry, belonging to the technical field of physical and chemical inspection of materials for the cigarette, and provides a quantitative selected ion determining method through the static headspace and gas chromatography mass spectrometry, aiming at selectively determining the residual vinyl acetate in white latex for the cigarette. A sample of the white latex for the cigarette after static headspace at 80 DEG C for 15 minutes is detected by taking 2-hexanone as an internal standard through HP-INNOWAX column in a GC-MS / SIM (Gas Chromatography Mass Spectrometry / Selected Ion Monitoring) mode, and is quantified through an internal standard method. According to the method for selectively determining the residual vinyl acetate in the white latex for the cigarette through the static headspace gas chromatography mass spectrometry, disclosed by the invention, detection limit, labeling recovery ratio and RSD (Relative Standard Deviation) of the method are respectively 0.63mg / kg, 104-107% and 2.5-4.9%; in addition, the method disclosed by the invention has the characteristics of simpleness, fastness, accuracy, sensitiveness and the like, and is especially suitable for quantitative analysis on the residual vinyl acetate in the white latex for the cigarette.

A continuous preparation method of N,N'-bis(1,4-dimethylpentyl)-p-phenylenediamine includes the steps of: 1) performing a reaction to p-nitroaniline or p-phenylenediamine with 5-methyl-2-hexanone and acid in a first reactor to obtain a first material; 2) feeding the first material into a first distillation kettle, and withdrawing 5-methyl-2-hexanone from the top of the distillation kettle and withdrawing a kettle liquid to obtain a second material; 3) feeding the second material into a second reactor, in which palladium, platinum, nickel or the like solids or a supported catalyst thereof is disposed, and feeding hydrogen to perform a reaction to obtain a third reaction solution; and 4) feeding the third reaction solution into a second distillation kettle to perform distillation to obtain the N,N'-bis(1,4-dimethylpentyl)-p-phenylenediamine. The method can avoid a phenomenon that a large amount of alcohol is converted into ketones, which commonly exists in one-step reaction in a kettle reactor a fixed bed reactor, and greatly reduces recovery and treatment cost of the raw material ketone, thereby reducing material consumption and energy consumption.

The invention discloses a catalyst used for preparing N-(1,4-dimethylpentyl)-p-phenylenediamine, a preparation method thereof, and a preparation method of N-(1,4-dimethylpentyl)-p-phenylenediamine. The catalyst comprises a catalyst carrier and active components comprising copper-nickel-chromium-palladium-zinc. In the above catalyst, copper-nickel-chromium-palladium-zinc are adopted as active components. During a process for preparing N-(1,4-dimethylpentyl)-p-phenylenediamine through a condensation reduction reaction and with p-phenylenediamine or p-nitroaniline and 5-methyl-2-hexanone as raw materials, the provided catalyst is used for catalyzing the condensation reduction reaction. With the catalyst, the obtained N-(1,4-dimethylpentyl)-p-phenylenediamine has relatively high purity and conversion rate. Also, the reaction is simple and is easy to operate.

The invention discloses a method for determining oxygenated compound of C6 in gasoline or a micro-reaction product by gas chromatography. The method comprises the following steps: introducing a determined sample to a sampling opening of a gas chromatography and enabling the determined sample to enter a nonpolar chromatographic column after the determined sample enters a pretruncating column, back-flushing heavy components with boiling point greater than that of n-undecane out of the gas chromatography by changing the pressure program of the chromatographic column after the components with boiling point being not greater than that of the n-undecane flow out from the pretruncating column, regulating the connection position of an electromagnetic valve, detecting through a flame ionization detector after the components separated from the nonpolar chromatographic column enter the strongly polar chromatographic column, changing the position of the electromagnetic valve after 2-hexanone flows out from the nonpolar chromatographic column and enters the strongly polar chromatographic column, so as to enable the carrier gas flowing by the nonpolar chromatographic column to flow to a damping column and the components with boiling point higher than that of 2-hexanone to directly enter another flame ionization detector for detection. According to the method, the lower detection limit of the oxygenated compounds can be reduced.