08.11.05
division of organic pigments
Patent No. U.S. 6,582,508 B2
Clariant has received a patent for a process to manufacture finely divided organic pigments. The method entails spraying a coarsely crystalline crude pigment and/or a poorly dispersible prepigment in suspension form through nozzles to a point of conjoint collision in a reactor chamber enclosed by a housing in a microjet reactor to form a pigment suspension, wherein the microjet reactor has a gas entry side and a product and gas exit side, passing a gas or an evaporating liquid into the reactor chamber through an opening in the housing for the purpose of maintaining a gas atmosphere in the reactor chamber, and removing the pigment suspension and the gas or the evaporating liquid from the microjet reactor through a further opening in the housing by means of overpressure on the gas entry side or underpressure on the product and gas exit side.
Patent No. U.S. 6,582,508 B2
Clariant has received a patent for a process to manufacture finely divided organic pigments. The method entails spraying a coarsely crystalline crude pigment and/or a poorly dispersible prepigment in suspension form through nozzles to a point of conjoint collision in a reactor chamber enclosed by a housing in a microjet reactor to form a pigment suspension, wherein the microjet reactor has a gas entry side and a product and gas exit side, passing a gas or an evaporating liquid into the reactor chamber through an opening in the housing for the purpose of maintaining a gas atmosphere in the reactor chamber, and removing the pigment suspension and the gas or the evaporating liquid from the microjet reactor through a further opening in the housing by means of overpressure on the gas entry side or underpressure on the product and gas exit side.