Abstract: The present invention relates to a novel process for the preparation of high-purity chemicals with an extremely low particle count, such as ammonia gas, hydrogen fluoride and hydrogen chloride, which are also used as aqueous solutions in semiconductor technology the corrosive gas is enriched with an absorbent which is miscible with the gas and in which impurities present in the gas are soluble, and the gas is subsequently subjected to membrane filtration.

Abstract: This invention relates to a novel method, which can be carried out according to industrial standards, for producing high-purity hydrochloric acid with a very low particle content, for use in the production of semiconductors.

Abstract: The invention relates to a novel method for producing high-purity sulfuric acid for use in the semiconductor industry. The method comprises the addition of a hydrogen peroxide solution to an engineered oelum in order to reduce the SO2 concentration, evaporation of the SO3 and separation of acid traces. The high-purity SO3 is then enriched with inert gas and the SO3 is absorbed into sulfuric acid.

Abstract: The present invention relates to a novel process for the preparation of high-purity chemicals with an extremely low particle count, such as ammonia gas, hydrogen fluoride and hydrogen chloride, which are also used as aqueous solutions in semiconductor technology the corrosive gas is enriched with an absorbent which is miscible with the gas and in which impurities present in the gas are soluble, and the gas is subsequently subjected to membrane filtration.

Abstract: The invention relates to a novel method for producing high-purity sulfuric acid for use in the semiconductor industry. The method comprises the addition of a hydrogen peroxide solution to an engineered oelum in order to reduce the SO2 concentration, evaporation of the SO3 and separation of acid traces. The high-purity SO3 is then enriched with inert gas and the SO3 is absorbed into sulfuric acid.

Abstract: In a hose coupling with a coupling sleeve and a coupling nipple and a valve insert (9) provided therein, the valve spring, the holding element and the valve seat of the valve insert are designed as a one-piece component, and the valve spring (11) has a cavity (21) which is closeable.

Abstract: Container for transporting, storing and dispensing chemical products, including an inner shell made of fluoroplastic, particularly PFA, fitted at its upper part with a stopper device traversed by filling and dispensing connections, and an outer shell exhibiting a substantially cylindrical outer shape and an inner shape substantially matching that of the inner shell.The outer shell (1) is made up of a cylindrical part (6) which, at its lower part, is integral with a base (7) of quadrilateral cross-section and of greater cross-sectional area than that of the cylindrical part of the outer shell.

Abstract: A new compound is disclosed, N-(chlorocarbonyloxy-5-norbornene-2,3-dicarboximide I, in addition to processes for its production and employment of the compound as starting product for the manufacture of non-symmetrical carbonate, urethane-protected amino acid or peptide, activated carrier and carrier-ligand-complexes. The new compound is reacted with alcohols as well as with hydroxyl-group-containing or amino-group-containing polymers.

Abstract: A device for transporting and emptying very pure liquid chemicals capable of reacting with constituents of the atmosphere. The device includes container which has an upper part connected to a lower part by a flange having a gasket interposed between the container and the flange. The upper part of the container has filling and emptying tubes extending into the container, and the emptying tubes has rupture valves located therein for preventing contact between the very pure liquid chemicals in the container and constituents of the atmosphere which may be present in the top portion of the emptying tubes prior to emptying of the device.