NOVELTY - Producing high purity d-mannose product involves: passing fermented palm oil kernel meal stream of water, d-mannose, d-glucose, other sugars, color agents, biomass and salts to simulated moving bed (SMB) zone to provide highly pure mannose stream of d-mannose, color agents, salts, biomass, and water and primary raffinate stream of water, d-glucose, salts, and other sugars, and secondary raffinate stream of water, where the SMB zone comprises adsorption beds having stationary phase agent including ion exchange resin; and introducing mobile phase stream of water to SMB zone.    USE - For producing high purity d-mannose product (claimed) as food additive, sweetener, texturizer, stabilizer and humectant.    ADVANTAGE - The process has a simplified processing route and provides high purity d-mannose product having 95-99.9 wt.% of d-mannose.    DETAILED DESCRIPTION - A process of the production of a high purity d-mannose product from fermented palm oil kernel meal using simulated moving bed separation, involves: (a) passing a palm kernel meal stream comprising water, d-mannose, d-glucose, other sugars, color agents, salts and biomass at a pH of 4-6 (preferably 4.5-5) to a filtration zone comprising a filter media to remove at least a portion of the biomass to provide a filtered feed-stream comprising water, d-mannose, d-glucose, salts, other sugars, and color agents; (b) passing the filtered feed-stream to a simulated moving bed (SMB) zone to provide a highly pure mannose extract stream comprising d-mannose, color agents, salts and water and a primary raffinate stream comprising water, d-glucose, salts, and other sugars, and a secondary raffinate stream consisting essentially of water, where the SMB zone comprises adsorption beds containing a stationary phase agent comprising an effective ion exchange resin, and introducing a mobile phase stream comprising water to the SMB zone, where the SMB zone being operated at effective conditions and being operated in effective rectification, adsorption, and regeneration cycle to provide a continuous process for producing the highly pure mannose stream and returning at least a portion of the secondary raffinate stream to the SMB zone to be mixed with the mobile phase stream; (c) passing the highly pure mannose stream to a de-colorization zone where the highly pure mannose extract stream is contacted with a medium effective to at least partially remove the color agents to provide a decolorized stream comprising d-mannose, salts and water; (d) passing the decolorized stream to a first evaporation zone to remove at least a portion of the water and provide a first evaporated stream; (e) passing the first evaporated stream to a desalination zone to provide a desalinized stream; (f) passing the desalinized stream to a second evaporation zone to provide an evaporated desalinized stream; (g) passing the evaporated desalinated extract stream to a precipitation zone or a crystallization zone to provide wet mannose crystals; and (h) passing the wet mannose crystal stream to a vacuum drying zone to provide the high purity d-mannose product.