Lactose Crystallization Yield Improvement via Segmented Cooling
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Solution Overview
Problem
Current lactose production methods result in significant losses due to metastable phases during cooling, leading to small crystal formation and breakage, resulting in 17% and 20% lactose loss, respectively, with a residual content of 35-40% in the mother liquor, making the process economically inefficient.
Innovation Solution
Gradually cooling an aqueous lactose solution and adding a carbohydrate compound to exceed the solubility product, allowing for the separation of alpha-lactose crystals in two stages, reducing the residual lactose content in the mother liquor to 15-25% by weight, and using cheaper sources like beet sugar molasses to enhance profitability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the cooling process is carried out gradually through metastable phases to allow crystal growth, then larger alpha lactose crystals are formed, but new crystal nuclei continuously form and remain very small, resulting in 17% lactose loss that cannot be collected
Solution Approach 1:
The patent divides the crystallisation process into two distinct stages: a first crystallisation stage that produces collectable alpha lactose crystals, and a second crystallisation stage that recovers additional lactose from the mother liquor. This segmentation allows each stage to be optimized independently, with the second stage specifically targeting the recovery of previously lost small crystals, thereby reducing overall lactose loss from 17% to significantly lower levels.
2Productivity
If stirring is applied in the decanter to separate crystals, then separation efficiency is improved, but crystals break into small particles that cannot be separated, resulting in 20% lactose loss
Solution Approach 1:
The patent applies dynamic control of stirring intensity across different process stages. During the first crystallisation stage, stirring is maintained at levels sufficient for crystal growth and separation. During the second crystallisation stage, stirring intensity is reduced to below 50 rpm (or even stopped) to prevent breakage of the more fragile crystals formed in this stage, while still allowing adequate separation. This dynamic adjustment resolves the contradiction between separation efficiency and crystal integrity.
3Productivity
If the mother liquor is processed again to recover lactose, then yield is improved, but the residual lactose content of 35-40% requires high processing effort
Solution Approach 1:
The patent implements a continuous two-stage crystallisation process where the mother liquor from the first stage is directly fed into the second stage without interruption or additional complex processing. This continuous approach maintains lactose in solution during transfer and immediately subjects it to controlled cooling for further crystal formation. The process achieves high yield (reducing residual lactose to 15-25%) while keeping processing effort moderate through straightforward sequential operation rather than complex multi-step recovery systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively reduces lactose loss to 15-25% in the mother liquor, improving the overall yield and economic efficiency of lactose production by optimizing crystal growth and separation processes.
Implementation Method 1
an aqueous lactose solution is gradually cooled down to about 10° C.
Implementation Method 2
a first amount of precipitated alpha-lactose crystals is separated from the mother liquor
Implementation Method 3
adding a carbohydrate compound to exceed the solubility product, allowing for the separation of alpha-lactose crystals
Data Source
AI summary
A method for improving the yield of the production of crystalline alpha-lactose is suggested, wherein(a) an aqueous lactose solution is gradually cooled down to about 10° C.,(b) a first amount of precipitated alpha-lactose crystals is separated from the mother liquor,(c) an amount of a carbohydrate compound is added to the mother liquor such that the solubility product of the lactose is exceeded at the given temperature,(d) a second amount of precipitated alpha-lactose crystals is separated from the mother liquor, and(e) both amounts of alpha-lactose crystals are combined.