9 results about "Dibromomethane" patented technology

The present invention relates to a process for producing carbon comprising the step of exothermically pyrolyzing a starting composition containing at least 50% by mole of dibromomethane, less than 5% by mole of hydrogen donor and less than 0.5% by mole of oxygen in a pyrolysis reactor at a temperature of 600 to 2,000°C to carbon and hydrogen bromide.

This invention provides a method for preparing deuterated paraoxymethylene. Specifically, this invention provides a method for preparing deuterated paraoxymethylene comprising the following steps: (S1) deuteration of dibromomethane; (S2) synthesis of deuterated methylene diacetate; and (S3) synthesis of deuterated paraoxymethylene.

The present invention relates to a method of reducing methane production in a ruminant and / or improving the production performance of a ruminant, said method comprising the step of administering to the ruminant one or more dihalomethane selected from the group consisting of dibromomethane, diiodomethane, bromoiodomethane and chloroiodomethane in an effective amount in the range of 2-50 mg dihalomethane / kg DM. The invention also relates to one or more dihalomethanes in ruminant feed additives and methods for reducing methane production in ruminants and / or improving the production performance of ruminants.

The invention relates to an improved process for preparing bromochloromethane by reacting dichloromethane and dibromomethane in the presence of catalysts.

The invention belongs to the technical field of mass spectrometric detection and analysis, and relates to a method for mass spectrometric detection of ammonia gas based on a VUV lamp. A time-of-flight mass spectrum is used as an analyzer, a photoinduced dibromomethane chemical ionization source is used as a mass spectrum ionization source, gas to be detected enters the mass spectrum ionization source in a negative pressure form through a capillary tube, and meanwhile, 2000ppmv dibromomethane reagent enters the mass spectrum ionization source in a negative pressure form through another capillary tube; the method comprises the following steps: performing addition reaction on dibromomethane reagent ions generated by ionizing dibromomethane gas by using a VUV lamp and ammonia molecules to form [CH2Br2.NH3] < + > characteristic peaks with the abundance ratio of m / z 189, m / z 191 and m / z 193 being 1: 2: 1; according to the method, the defect that the ammonia gas cannot be detected through VUV lamp single-photon ionization is overcome, the qualitative analysis capacity and the signal intensity of the ammonia gas are improved, and the online analysis capacity can meet the detection requirement of the ammonia gas in electrocatalytic reaction ammonia synthesis.

The invention provides a preparation method of deuterated paraformaldehyde. Specifically, the invention provides a preparation method of deuterated polyformaldehyde, which comprises the following steps: (S1) deuterating dibromomethane; (S2) synthesis of deuterated methylene diacetate; and (S3) synthesizing the deuterated polyformaldehyde.

The invention belongs to the technical field of mass spectrometric detection and analysis, and relates to a method for mass spectrometric detection of ethylene in atmosphere based on a VUV lamp. A flight time mass spectrum is used as an analyzer, a photoinduced dibromomethane chemical ionization source is used as a mass spectrum ionization source, gas to be detected enters the mass spectrum ionization source in a negative pressure form through a PEEK capillary tube, and meanwhile, 2000ppmv dibromomethane reagent enters the mass spectrum ionization source in a negative pressure form through another PEEK capillary tube; dibromomethane reagent ions generated by ionizing dibromomethane gas through a VUV lamp and ethylene molecules are subjected to a substitution reaction to form [CH2Br.C2H4] < + > characteristic peaks with the abundance ratio of m / z 121 to m / z 123 being 1: 1. According to the method, the defect that ethylene cannot be detected through VUV lamp single-photon ionization is overcome, the qualitative and quantitative analysis capacity and the signal intensity of ethylene are improved, and the sensitivity can meet the detection requirement of trace ethylene in the atmosphere.

The present invention relates to a process for converting carbon dioxide into carbon monoxide using in situ generated carbon comprising the step of reacting a starting composition containing carbon dioxide and dibromomethane in a reactor at a temperature of 900 to 2,000°C so as to produce a carbon monoxide and hydrogen bromide containing gaseous reaction mixture.