Abstract: The invention relates to a process for the detection of hydrocarbons other than methane in a gas predominantly or essentially comprising oxygen, as well as methane and the said hydrocarbons other than methane, the said process comprising: a stage of detection of the combined hydrocarbons in the said gas, providing a first value for the combined hydrocarbons, a stage of combustion of the hydrocarbons other than methane, a stage of detection of methane in the said gas, providing a second value, a stage of calculation of the amount of hydrocarbons other than methane by the difference between the first value and the second value. The invention also relates to a device for implementing this process.

Abstract: The invention relates to a process for the detection of hydrocarbons other than methane in a gas predominantly or essentially comprising oxygen, as well as methane and the said hydrocarbons other than methane, the said process comprising:

Abstract: The invention relates to a device for storing and mixing two gases or mixtures of gases under pressure. The device includes: an outer chamber containing the first of the gases and being equipped with an opening; an inner chamber arranged inside the outer chamber containing the second gas, and being equipped with an opening; a two-way valve which includes a body fixed hermetically in the opening of the outer chamber, a first passage having one end connected to the inner chamber and being equipped with a first controllable shut-off device, and a second passage having a first end connected to the outer chamber and being equipped with a second controllable shut-off device; first and second flow rate and pressure adjusting devices, each being connected to one of the passages of the valve; and first and second pipes for connecting the outlet of each adjusting device to a single outlet.

Abstract: The invention relates to a device for storing and mixing two gases or mixtures of gases under pressure.

Abstract: Provided are a process and apparatus for purifying a gas. In accordance with the process, the gas to be purified flows through a hollow dielectric tube. An electric field is created in the gas to be purified by a traveling electromagnetic wave which travels in the dielectric tube and creates, in the gas, an atmospheric-pressure plasma which is not in local thermodynamic equilibrium, for the purpose of dissociating impurities in the gas to form reactive compounds. The formed reactive compounds are reacted with a corresponding reactive material for eliminating the reactive compounds from the gas to be purified.

Abstract: Provided is a process for purfying a gas. In the process, the gas to be purified flows through a hollow dielectric tube. An electric field in the gas to be purified is created by a traveling electromagnetic wave which travels in the dielectric tube and is suitable for creating, in the gas, an atmospheric-pressure plasma which is not in local thermodynamic equilibrium, for the purpose of dissociating impurities in the gas in order to form reactive compounds. The formed reactive compounds are reacted with a corresponding reactive material for eliminating the reactive compounds from the gas to be purified.

Abstract: A process for supplying a gas to a reactor comprising the steps of:(i) continuously measuring density of the gas, the gas including at least one component which is susceptible to formation of an undesired side product as shown by a variation in density of the gas; and(ii) modifying feed conditions of the gas if formation of the undesired side product is shown by a variation in the density of the gas.The process can be employed to continuously monitor the content of diborane (B.sub.2 H.sub.6) in a mixture with silane (SiH.sub.4) in a process for producing a borophosphosilicate glass.An apparatus for supplying a gas to a reactor is also disclosed.

Abstract: A process for supplying a gas to a reactor comprising the steps of:(i) continuously measuring density of the gas, the gas including at least one component which is susceptible to formation of an undesired side product as shown by a variation in density of the gas; and(ii) modifying feed conditions of the gas if formation of the undesired side product is shown by a variation in the density of the gas.The process can be employed to continuously monitor the content of diborane (B.sub.2 H.sub.6) in a mixture with silane (SiH.sub.4) in a process for producing a borophosphosilicate glass.An apparatus for supplying a gas to a reactor is also disclosed.

Abstract: The apparatus for determining the quantity of impurity in a gas by chromatography in gas phase comprises a device for cryogenically trapping impurities, which is provided with a column filled with granular particles of a product capable of adsorbing the impurities, refrigerating means capable of keeping the column at low temperature during passage of the gas loaded with impurities and reheating means for an ulterior desorption;a first chromatographic adsorber in gas phase intended for a preliminary analysis and provided with a filling column for each impurity;a device for the cryogenic recentering of the purities, which is provided with a capillary column, refrigerating means capable of keeping the column at low temperature during the passage of a carrier gas which has gone through the first chromatographic adsorber, and desorption reheating means;and a second chromatographic adsorber in gas phase provided with a capillary column, a detection device being mounted at the outlet.