Process for purifying maltose
AssigneeDanisco Sweeteners Oy
InventorsHeikki Heikkila, Mika Manttari, Mirja Lindroos, Marianne Nystrom
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Abstract
The invention relates to a process for purifying a maltose-containing liquor from a undesired impurities, such as maltotriose. The process of the invention is characterized by nanofiltering said liquor and recovering a purified maltose solution as the permeate.
Claims40
A process for purifying a maltose-containing liquor from maltotriose, wherein said maltose-containing liquor has a maltose content of at least about 55% by weight, based on dissolved dry solids, characterized by nanofiltering said liquor and recovering as the permeate a maltose solution having an increased ratio of maltose to maltotriose.
A process as claimed in any one of the preceding claims, characterized in that the starting liquor has a maltose content of at least about 80% by weight, based on dissolved dry solids.
A process as claimed in any one of the preceding claims, characterized in that the starting liquor has a maltose content of 55 to 90% by weight, preferably 80 to 90% by weight, based on dissolved dry solids.
A process as claimed in any one of the preceding claims, characterized in that the starting maltose-containing liquor is a maltose syrup.
A process as claimed in any one of the preceding claims, characterized in that the process also comprises one or more pretreatment steps.
A process as claimed in any one of the preceding claims, characterized in that nanofiltration is carried out at a pH of 1 to 8, preferably 4 to 8, most preferably 4.5 to 7.0.
A process as claimed in any one of the preceding claims, characterized in that nanofiltration is carried out at a pressure of 10 to 50 bar, preferably 15 to 35 bar.
A process as claimed in any one of the preceding claims, characterized in that nanofiltration is carried out at a temperature of 5 to 95° C., preferably 30 to 60° C.
A process as claimed in any one of the preceding claims, characterized in that nanofiltration is carried out with a flux of 10 to 100 l/m2h.
A process as claimed in any one of the preceding claims, characterized in that nanofiltration is carried out using a nanofiltration membrane selected from polymeric and inorganic membranes having a cut-off size of 100 to 2500 g/mol.
A proces s as claimed in any one of the preceding claims, characterized in that the nanofiltration membrane has been pretreated by washing.
A process as claimed in any one of the preceding claims, characterized in that the nanofiltration process is repeated at least once.
A process as claimed in any one of the preceding claims, characterized in that the process is carried out batchwise or continuously.
A process as claimed in any one of the preceding claims, characterized in that the process is carried out using a nanofiltration equipment including several nanofiltration elements arranged in parallel or series.
A process as claimed in any one of the preceding claims, characterized in that the process also comprises one or more post-treatment steps.
A process as claimed in any one of the preceding claims, characterized by simultaneously recovering as the permeate a maltose solution enriched in glucose.
A process as claimed in any one of the preceding claims, characterized by simultaneously recovering as the permeate a solution deprived of oligosaccharides.
A process as claimed in any one of the preceding claims, characterized in that the process comprises a further step of recovering as the retentate a solution enriched in oligosaccharides.
Dependencies are inferred from the claim text.