摘要:
A corrosion resistant gas cylinder (12) and gas delivery system includes an electroless nickel-phosphorous layer (30) overlying the inner surface (32) of a steel alloy cylinder. The nickel-phosphorous layer (30) has a thickness of at least about 20 micrometers and a porosity of no greater than about 0.1%. The electroless nickel-phosphorous layer (30) has a phosphorous content of at least about 10% by weight and a surface roughness of no greater than about 5 micrometers. Prior to introducing liquefied gas into the gas cylinder, a cleaning process is carried out using a two-step baking process to clean the surface of the nickel-phosphorous layer. The nickel-phosphorous layer (30) substantially reduces the contamination of liquefied corrosive gasses stored in the gas cylinder by metal from the steel wall surface underlying the nickel-phosphorous layer. Metal contamination levels of less than about 55 ppb of iron, 10 ppb of chromium, and 5 ppb of nickel by weight can be maintained in liquefied corrosive gasses stored for an extended period of time in the electroless nickel-phosphorus plated gas cylinder.
摘要:
The invention relates to a method and an installation for forming a deposit on a substrate (1) wherein the substrate is brought into contact with a gas treatment atmosphere in order to carry out said deposit, whereby the gas treatment atmosphere is obtained from a primary (7) gas treatment mixture comprising excited or unstable types of gas and which is obtained as the gas exits from an excited or unstable (4) gas type forming device and an adjacent gas treatment mixture comprising at least one gas precursor required (41) to form said deposit, whereby the adjacent mixture is not transported via said device. The invention is characterized in that the adjacent gas treatment mixture is injected into the flow of the primary gas mixture obtained when the gas exits from the device.
摘要:
The invention concerns a method for obtaining fibres integral with calcium carbonate particles which consists in contacting the fibres to be treated with carbon dioxide generators and with at least a composition containing Ca++ ions capable of reacting with the carbon dioxide so as to obtain 'in fine' a calcium carbonate precipitate 'in situ' on the fibres. Preferably, calcium bicarbonate is used as carbon dioxide generator. The invention also concerns a method for eliminating calcium carbonate from other insoluble substances contained in various aqueous media, and derived in particular from papers to be recycled, and de-inking sludge which consists in injecting CO¿2? in the medium to be treated, solubilizing the calcium carbonate into calcium bicarbonate, separating the calcium bicarbonate formed by filtering the medium after reaction.
摘要:
The invention concerns a method for brazing by solder reflow electronic components (22) on a support, for example a printed circuit wafer (20) which consists in: arranging a solder alloy on the support (20) in sites for connecting the components (22); placing the components on the connection sites and brazing the components (22) properly speaking by a thermal treatment of the support, by contacting it, at a pressure close to atmospheric pressure, with a treating atmosphere comprising excited or unstable species substantially free from electrically charged species, the atmosphere being obtained by passing an initial treating gas in an electrical discharge, and the thermal treatment of the support being obtained by using the species thus heated by the action of the discharge.
摘要:
The invention is concerned with an improved process for the desulphurization of blister copper during anode refining, wherein a mixture of an inert gas and an oxygen containing gas is blown into liquid blister copper. The improvement resides in varying the amount of oxygen containing gas in the mixture of nitrogen and oxygen during the desulphurization of blister copper. The process of the invention enables one to increase the recovery of copper, decrease the recycling of highly oxidized slag, decrease the time of desulphurization, decrease refractory wear, decrease subsequent time of reduction and decrease the amounts of reactants used.
摘要:
The invention concerns a method for heating products in a chamber, by a burner housed in the wall thereof optionally via a directly mounted port. Separate fuel gas and oxidant gas streams are introduced in the burner respective conduits (1, 2), separately transmitted to separate chambers (3, 4) for equalising the pressure levels of the two gas streams and separately evacuated, by outlet conduits (5, 6) emerging into the chamber through two respective adjacent slots (7, 8), in the form of adjacent laminar flows, beneath the flame; the two gases being only partially mixed, the flame profile has a zone where the oxidant is in excess, thus in turn determining an oxidant zone, and a zone where the oxidant is lacking, determining in turn a reducing zone.
摘要:
The invention concerns a compound of formula (I) in which: W1, W2 and W3 represent each a divalent radical selected among those represented by the general formula (A): -[CT1T2)n-[N(R4)]p-(CT3T4)m]1-, as defined in the description; R4 represents a hydrogen atom, an alkyl radical, a [(hetero)aryl]alkyl or a radical of the formula (B): R5-Si(X1)(X2)(X3) as defined in the description; R1 and R2, and R3 represent each a hydrogen atom, an alkyl radical, or a [(hetero)aryl]alkyl radical or a radical represented by the formula (B) provided that the polyazacycloalkane ring of the compound of formula (I) comprises not more than 30 cyclic carbon atoms and not more than 6 cyclic nitrogen atoms and at least one of these cyclic nitrogen atoms is substituted by a radical of formula (B). The invention also concerns the preparation method and the use of said compound for the synthesis of polysiloxane gels; the use of said gels for purifying oxygen or extract oxygen from air.
摘要翻译:本发明涉及式(I)的化合物,其中:W 1,W 2和W 3各自表示选自由通式(A)表示的二价基团: - [CT 1 T 2] n - [N(R 4)] p - CT3T4)m] 1-,如描述中所定义; R 4代表氢原子,烷基,[(杂)芳基]烷基或式(B)的基团:描述中定义的R 5 -Si(X 1)(X 2)(X 3) 式(I)化合物的多氮杂环烷烃环包含式(I)化合物的多氮杂环烷烃环,其中R 1和R 2和R 3各自表示氢原子,烷基或[(杂)芳基]烷基或式 不多于30个环碳原子和不多于6个环氮原子,并且这些环氮原子中的至少一个被式(B)的基团取代。 本发明还涉及所述化合物用于合成聚硅氧烷凝胶的制备方法和用途; 使用所述凝胶来净化氧气或从空气中提取氧气。
摘要:
The invention concerns a dispenser (1) comprising: a primary dispenser (3) defining a closed volume provided with openings (8) for pre-dispensing liquid emerging in the column; means for supplying the primary dispenser (3) with liquid under pressure very much higher than the pressure inside the column; and a secondary dispenser (4) taking up substantially the whole section of the column, which comprises a gaseous roof communicating with the column internal space and which is subdivided by internal partitions (13, 17) into a plurality of compartments (16) each of which receives the liquid coming from at least one of the primary dispenser (3) said orifices (8), said secondary dispenser (4) comprising a base (9) provided with orifices (12) dispensing fine liquid over almost the whole section of the column, said orifices being much more numerous than the primary dispenser openings (8). The invention is applicable to air distilling on offshore floating terminals or on drilling platforms.
摘要:
The invention concerns a device (1) for controlling an installation (2), comprising means (9, 10, 11, 12, 13) for monitoring and/or controlling the operation of said installation (2), and a central data processing unit (14) adapted to communicate with said monitoring and/or controlling means (9, 10, 11, 12, 13,) to read, send and/or process data concerning the operation of the installation. The central unit (14) comprises means (16) for storing at least one task in parametric representation acting on said data concerning the operation of the installation, means for memorising at least a table, each table being associated with a task in parametric representation and comprising parameter values of the task concerned for the execution thereof, and, connected to each storing means (16, 17) means (15) for executing said tasks in parametric representation using said values memorised in said table(s) when said tasks in parametric representation are being executed.
摘要:
The invention concerns a method for supplying, from a common source of air (13), at least two working gases whereof the limit of O2 content, respectively t1 and t2, are such that t1 is greater than t2. The method consists in: depleting the air in O2 (1) to obtain a first gas mixture with O2 content not more than t1; using part of this first gas mixture to supply (7) the first working gas; depleting another part of this first mixture in O2 (3) to obtain a second gas mixture with O2 content not more than t2; and using this second gas mixture to supply (9) the second working gas.