摘要:
The invention relates to a method for cleaning objects wherein said objects are placed into a cleaning chamber and contacted with a dense phase gas. After or during draining the dense phase gas from the cleaning chamber the pressure in said cleaning chamber is changed at a rate of at least 1 bar per minute, preferably at a rate of 5 bar per minute, more preferably at a rate of 10 bar per minute.
摘要:
The invention relates to a process for separating a composition into at least two fractions. Said composition comprises a mixture of organic alcohols in the carbon number range 4 to 18 which previously has been subjected to reaction with organic epoxides, including ethylene oxide, propylene oxide or butylenes oxide, or mixtures thereof, simultaneously or sequentially, said composition therefore containing a broad distribution of epoxide or alcoxy units. Pressurized carbon dioxide in at least 90% concentration by weight is used as separation agent and said composition is separated in at least two fractions which differ in the average number of alcoxy units which are attached to said organic alcohols, and may differ in the average molecular weight of said organic alcohols.
摘要:
The invention is related to a method for treating objects in condensed gas wherein a cleaning chamber of a cleaning machine is at least partly filled with said condensed gas, in particular with liquid carbon dioxide, said objects are placed into said cleaning chamber and treated in said liquid carbon dioxide, and wherein a filtration or absorption device is placed into said cleaning machine.
摘要:
The present invention relates to a process for cleaning goods comprising the following steps: a) placing the goods to be cleaned in a pressure-resistant cleaning vessel, b) introducing a cleaning solvent into the cleaning vessel, c) removing the residues carrying solvent from the container, d) separating the residues from the solvent, characterised in that, step b and step c are carried out at least twice, therefore leading at least to a first and second cleaning bath, using a halogenated and/or hydrocarbons containing solvent in one cleaning bath, and using a pressurised fluid containing solvent in another cleaning bath. Furthermore, the present invention relates to a process of the kind mentioned above, characterised in that, step b and step c are carried out at least once, therefore leading at least to one cleaning bath, using a halogenated and/or hydrocarbons containing solvent in combination with a pressurised fluid containing solvent in at least one cleaning bath.
摘要:
The invention relates to a method for the production of a polymeric article in a moulding tool comprising a first and a second mould half (1, 2). A liquid polymer (5) is introduced into a cavity (3) between said first and said second mould half and is at least partly solidified. Said second mould half (2) is removed, a cover (2, 7) is placed onto said first mould half (1) and a gas is introduced into the closed space (8) formed between said cover (2, 7), said polymer (6) and / or said first mould half (1).
摘要:
The invention relates to a method for processing parts in more than one bath of dense phase carbon dioxide wherein said processing in one of said baths comprises the steps of a) transferring dense phase carbon dioxide from a storage tank to a cleaning chamber, b) processing said parts in said cleaning chamber with said dense phase carbon dioxide, c) withdrawing at least a part of said dense phase carbon dioxide from said cleaning chamber, d) distilling (2) said withdrawn dense phase carbon dioxide, and e) transferring back said distilled carbon dioxide to said storage tank (1),
wherein said distilled carbon dioxide is cooled (6) prior to being transferred to said storage tank (1) wherein said cooling (6) is carried out depending on the temperature and/or on the pressure in the cleaning chamber.