摘要:
The invention relates to a method for separating gaseous mixtures from underground cables or gas insulated circuits. Said gaseous mixtures, which contain partially fluorinated and/or perfluorinated hydrocarbons and inert gases, are brought into contact with hydrophobic zeolites in at least one adsorption step, whereby the fluorinated hydrocarbons are adsorbed.
摘要:
3-aminocrotonate compounds, e.g. diester, which are substituted on the C-4 atom by at least 2 chlorine and/or fluorine atoms, can be produced by reacting appropriate acetoacetate compounds with ammonia and primary and secondary amines while simultaneously or subsequently eliminating water. To this end, the production is carried out in the presence of onium salts that are formed from primary or secondary amines and carboxylic acids. Two phases preferably form, whereby one phase contains the formed crotonate compound with a good degree of purity, and the other phase contains the onium salt and water.
摘要:
The invention relates to a method for storing liquefied zeotropic gas mixtures. In order to ensure a composition of the liquid phase that conforms with specifications, a differential pressure sensor is used to determine the change in the gas phase by comparing pressure with a calibration mixture. The mixture composition of the liquid phase is regulated by subsequently dosing the mixture constituents that have the higher partial pressure.
摘要:
Depending on the way it is produced or used, sulfuryl fluoride can be contaminated with sulfur dioxide and possibly with other impurities such as sulfuryl chloride fluoride. According to the invention, sulfur dioxide and if applicable sulfuryl chloride fluoride are separated by using aluminum oxide as an adsorbing agent, whereby no activated carbon is required as an additional agent.
摘要:
Auf Bauteile aus Aluminium oder Aluminiumlegierungen kann durch Aufbringen von Alkalimetallhexafluorsilikat und Erhitzen eine Beschichtung aus Aluminium-Silicium-Legierung abgeschieden werden. Durch eine sich gleichzeitig ausbildende nicht-korrosive Kaliumfluoraluminat-Schicht wird die Legierungsschicht wirksam vor einer Reoxidation geschützt.
摘要:
The invention relates to flameproof polyetherpolyol and/or polyesterpolyol preblends for producing foamed products, in particular PU foam products. Said preblend consists of polyol, more than 4 wt % of a binary expanding agent mixture of HFC 365mfc and an additional fluorocarbon and between 10 and 20 wt % of a phosphor-based flameproofing agent.
摘要:
The invention relates to a method for laser beam soldering aluminium alloys in which the joins are coated with a material that absorbs laser energy. Soldering fluxes that are suitable for soldering aluminium, especially fluxes, flux pastes or flux metal-powder mixtures containing potassium fluoroaluminate, are used as the laser energy-absorbing material.
摘要:
Ein verbessertes Verfahren zur Herstellung von Carbonsäureestern aus Säurechloriden, Säurebromiden oder Säuren und Alkoholen sieht vor, die Veresterung in Anwesenheit des Addukts (Oniumsalz) der entsprechenden Carbonsäure und 1,5-Diaza-bicyclo[4.3.0]non-2-en oder 1,8-Diaza-bicyclo[5.4.0]-undec-7-en durchzuführen. Alternativ kann man in Anwesenheit der entsprechenden Carbonsäure und eines Oniumsalzes der entsprechenden Carbonsäure arbeiten.