Patent DE-102009016730-A1 (DE)
Title: Method for the production of a saturated solution from a polyurethane reaction component such as polyol and isocyanate, comprises dosing saturated solution from the reaction component with a dissolved repellent in a process container
Inventor: SCHAMBERG MARTIN
IPC: B01J3/02
Filed: 2009-04-09
Abstract: The method for the production of a saturated solution from a polyurethane reaction component such as polyol and isocyanate, comprises dosing saturated solution from the polyurethane reaction component with a dissolved repellent in a process container (10) over a first pump (16) in a mixing head (18), in which a further reaction component is mixed and subsequently discharged. The process container is subjected with the gaseous repellent and a pressure level is held in the process container by the gaseous repellent atmosphere (12). The method for the production of a saturated solution from a polyurethane reaction component such as polyol and isocyanate, comprises dosing saturated solution from the polyurethane reaction component with a dissolved repellent in a process container (10) over a first pump (16) in a mixing head (18), in which a further reaction component is mixed and subsequently discharged. The process container is subjected with the gaseous repellent and a pressure level is held in the process container by the gaseous repellent atmosphere (12), where the pressure level lies in a range of 90-110% of the solution pressure associated to the desired repellent load. The process container is brought for post-filling the reaction component loaded with the repellent in a dosing quantity. A dosed reaction component stream is dosed to gaseous repellent before the introduction into the process container and is brought in the solution. The process container is operated so that the ratio of post-filling volume to gas volume is maximum 0.05. The gas area of the process container is sealed against the environment through a first valve (34), which opens only, when the pressure in the process container exceeds the desired balancing pressure to a defined procentual deviation. The desired value of the repellent dosing quantity is lowered, when between two post-filling processes of the process container, the pressure in the process container exceeds the desired balancing pressure to a given procentual deviation. The desired value is increased for the balancing pressure in the process container, when between two post-filling processes of the process container, the pressure in the process container exceeds the desired balancing pressure to a given procentual deviation. The gas area of the process container is sealed against a repellent reservoir through a second valve, which opens, when the pressure of the process container lowers the desired balancing pressure to a given procentual deviation under the desired balancing pressure. The desired value of the repellent-dosing quantity is increased, when the pressure in the process container sinks to given procentual deviation under the desired balance pressure between two post-filling processes of the process container. Carbon dioxide is used as repellent. The carbon dioxide is inoculated at a pressure of 30 bar in the flow of the reaction components. The pressure of the reaction component loaded with the repellent or a partial stream of the reaction component loaded with the repellent is raised behind a first mixing aggregate by a second pump on a pressure of 25 bar. The reaction components loaded with the repellent and/or a partial stream of the reaction components loaded with the repellent are guided over a second mixing aggregate. The unloaded reaction component is mixed with a partial stream of the reaction component loaded with the repellent, before it passes the inoculation point on which the repellent is added. The gas portion directly behind the inoculation point is 20 vol.%. The reaction component saturated with the repellent from the process container is brought by the first pump implemented as dosing pump with high pressure of the mixing head implemented as high pressure mixing head in which it is injected by nozzles with high speed in a mixing chamber in which a further reaction component is mixed and subsequently held in a tool. The repellent quantity is 2 g/s used in 5 seconds. An independent claim is included for a device for the production of a saturated solution from a polyurethane reaction component.