Method for Bleaching Sugar With Effluent Recycling
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United States of America
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Issued Date -
Mar 31, 2022
app pub date -
Feb 28, 2020
filing date -
Feb 28, 2020
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Abstract
The invention relates to a method for treating sugar comprising: placing a coloured sugar juice in contact with an ion exchange resin so as to charge the resin with colouring agents and to collect a bleached sugar juice; regenerating the colouring-charged resin, comprising: placing the charged resin in contact with a regeneration brine comprising a chloride salt; and collecting a regeneration effluent, the regeneration effluent comprising at least three fractions A, B and C, fraction A having a higher concentration of chloride salt than fractions B and C; and recycling the regeneration effluent, comprising: nanofiltration of fraction A of the regeneration effluent in order to obtain a first permeate and a first retentate; diafiltration of the first retentate, said diafiltration comprising: dilution of the first retentate with the fraction B of the regeneration effluent; nanofiltration of the mixture in order to obtain a second permeate and a second retentate; mixing of the first permeate with the second permeate and fraction C of the regeneration effluent,
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