Process for preparing chemically modified bicarbonate salt particles
AssigneeSteerlife India Private Limited
InventorsIndu Bhushan, Vinay Rao, Rakshith Shetty
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Abstract
The present disclosure relates to a method for chemically modifying particles of a bicarbonate salt in a co-rotating twin-screw extruder and chemically modified bicarbonate particles prepared therefrom. The present disclosure also relates to a method for controlling an amount of carbonate salt formed during chemical modification of bicarbonate salt particles.
Claims13
A method for chemically modifying particles of a bicarbonate salt in a co-rotating twin-screw extruder, the method comprising:
- feeding the particles into an intake zone of the extruder;
- processing the fed particles in a heat-treatment zone of the extruder at a temperature in the range of 200° C. to 350° C. for a residence time in the range 3 to 20 seconds to convert 3% to 40% w/w of the bicarbonate salt present in the fed particles into a carbonate salt, thereby chemically modifying the particles;
- and
- collecting the chemically modified particles from the extruder.
A method for controlling an amount of carbonate salt formed during chemical modification of bicarbonate salt particles, the method comprising:
- feeding the particles of bicarbonate salt into an intake zone of a co-rotating twin-screw extruder;
- processing the fed particles in a heat-treatment zone of the extruder for a residence time in the range 3 to 20 seconds to convert 3% to 40% w/w of the bicarbonate salt present in the fed particles into a carbonate salt, thereby chemically modifying the particles;
- and
- collecting the chemically modified particles from the extruder;
- wherein the amount of the bicarbonate salt converted into the carbonate salt is controlled by varying temperature of the heat-treatment zone in the range of 200° C. to 350° C.
Dependencies are inferred from the claim text.