Sugar Beet Juice Alkalinization for Purification
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Solution Overview
Problem
Conventional lime-carbonic acid extract purification methods for sugar beet juice are inefficient in removing non-sucrose substances, leading to suboptimal sucrose syrup quality due to high calcium salt content and color development issues, with limited removal of non-sucrose substances and adverse effects on filtration.
Innovation Solution
The method involves early alkalization of raw sugar beet juice with caustic soda followed by controlled alkalization steps, including a first and second liming process, optimized based on empirical relationships between pH and temperature to effectively flocculate and separate non-sucrose substances, reducing calcium salt content and improving filtration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional lime-carbonic acid extract purification is used, then the process is simple and well-established, but the removal of non-sucrose substances is insufficient leading to high calcium salt content and poor juice quality
Solution Approach 1:
The purification process is divided into multiple distinct stages: early alkalization with caustic soda, heating to specific temperature, and sequential liming steps. Each stage targets specific impurities at optimized conditions, improving overall purification quality without excessive complexity
Solution Approach 2:
The early alkalization step is performed before the main liming process to pre-condition the juice and facilitate subsequent purification. This preliminary action removes certain impurities and prepares the juice for more effective calcium carbonate precipitation in later stages
2Manufacturing precision
If conventional single-stage liming is used, then the process is fast and simple, but the color development is disadvantageous and calcium salt content remains high
Solution Approach 1:
The liming process is segmented into early alkalization with caustic soda followed by sequential liming steps with calcium hydroxide and calcium carbonate. Each segment operates at optimized pH and temperature ranges to minimize color development while effectively removing impurities
Solution Approach 2:
The process utilizes controlled changes in pH, temperature, and alkalinity at different stages. By maintaining specific parameter ranges during each step (e.g., heating to 60-80°C during early alkalization, controlling pH during liming), the method achieves high juice quality with reduced color development
3Manufacturing precision
If more milk of lime is added to increase alkalinity, then non-sucrose substances are better broken down, but the calcium salt content in the juice increases
Solution Approach 1:
The process uses controlled alkalization with specific pH targets at different stages. By limiting the pH increase during early alkalization and using sequential liming steps, the method effectively breaks down non-sucrose substances while controlling calcium salt accumulation through optimized alkalinity management
Solution Approach 2:
Calcium carbonate is used as an adsorption medium to selectively remove soluble non-sucrose materials from the juice. This extraction process eliminates impurities while the controlled alkalization prevents excessive calcium salt formation, achieving purification without excessive calcium addition
4Productivity
If the raw juice is not alkalized early, then the process is simpler, but filtration is adversely affected and sucrose yield decreases
Solution Approach 1:
Early alkalization with caustic soda is performed as a preliminary step before main liming to modify the juice chemistry. This preliminary action improves subsequent filtration by preventing unwanted reactions and facilitates better sucrose recovery by optimizing conditions for impurity removal
Solution Approach 2:
The early alkalization converts potentially harmful acidic conditions into beneficial alkaline conditions that improve filtration and sucrose yield. By controlling the pH early in the process, the method transforms what could be a problem (acidic juice affecting filtration) into an advantage (optimized conditions for purification and recovery)
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
This approach significantly enhances the purification of sugar beet juice, achieving higher sucrose yield, improved juice quality, and reduced calcium salt content, while extending the campaign time for processing inferior beet material and improving filterability.
Implementation Method 1
early alkalization of the raw juice with caustic soda, in particular with sodium hydroxide, and subsequent progressive liming
Implementation Method 2
heating the alkalized raw juice to the preliming temperature T
Implementation Method 3
preliming the alkalized raw juice by a second alkalization to a second alkalinity to flocculate the nonsucroses
Data Source
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AI summary
The invention relates to an improved method for purifying raw sugar beet juice, which is obtained by extraction from sugar beets, and to devices for purifying raw sugar beet juice. The present invention further relates to a method for the production of sucrose syrup or sucrose from raw sugar beet juice. The purification method according to the invention comprises the following steps: a) obtaining the raw juice by extraction of sugar beets, b) first alkalinization of the raw juice, c) heating the alkalinized raw juice, d) preliming the alkalinized raw juice by a second alkalinization.