Method and device for separating two phases
OwnerAnders Göran Hofstedtinventor
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Abstract
The invention is characterised in the steps of a) performing a first separation of the mixture in a first centrifugal separator, resulting in a first heavy fraction comprised of the heavy phase with only small amounts of impurities in the form of the light phase and a first light fraction comprising of the light phase with impurities in form of the heavy phase; and b) performing a second separation of the first light fraction in a second hermetic centrifugal separator of purificator type, resulting in a second heavy fraction comprised of the heavy phase with impurities in the form of the light phase and a second light fraction comprised of the light phase with only small amounts of impurities in the form of the heavy phase. The invention also relates to a device.
Claims22
Method for separating at least a light phase from a heavy phase, which phases are present in a mixture, wherein the heavy phase is a liquid phase and the light phase is either a liquid phase or a solid phase, wherein either the heavy phase is comprised of black liquor from a boiling step of a process for producing pulp according to the kraft process and the light phase is comprised of crude tall oil soap comprised in the black liquor, or the light phase is comprised of beta-glucan and the heavy phase is comprised of dextrin, wherein the method comprises the steps of:
- a) in a first separating step, performing a first separation of the mixture in a first centrifugal separator, resulting in a first heavy fraction comprised of the heavy phase with only small amounts of impurities in the form of the light phase and a first light fraction comprised of the light phase with impurities in the form of the heavy phase;
- and
- b) in a second separating step, performing a second separation of the first light fraction in a second centrifugal separator of purificator type, resulting in a second heavy fraction comprised of the heavy phase with impurities in the form of the light phase and a second light fraction comprised of the light phase with only small amounts of impurities in the form of the heavy phase;
- wherein at least the second centrifugal separator is of hermetically closed type.
Device for separating either a heavy phase in the form of black liquor from the boiling step of a process for producing pulp according to the kraft process from a light phase in the form of crude tall oil soap comprised in the black liquor, or alternatively for separating a heavy phase in the form of dextrin from a light phase in the form of beta-glucan, which phases are present in a mixture, wherein the heavy phase is a liquid phase and the light phase is either a liquid phase or a solid phase, wherein the device comprises:
- a) a first separating step comprising a first centrifugal separator, which first separating step is arranged to perform a first separation of the mixture using said first centrifugal separator, resulting in a first heavy fraction comprised of the heavy phase with only small amounts of impurities in the form of the light phase and a first light fraction comprised of the light phase with impurities in the form of the heavy phase;
- and
- b) a second separating step comprising a second centrifugal separator of purification type, which second separating step is arranged to perform a second separation of the first light fraction in a second centrifugal separator, resulting in a second heavy fraction comprised of the heavy phase with impurities in the form of the light phase and a second light fraction comprised of the light phase with only small amounts of impurities in the form of the heavy phase;
- wherein at least the second centrifugal separator is of hermetically closed type.
Dependencies are inferred from the claim text.