Hydraulic Wash Column Purification for Low-Separation Crystal Slurries
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Solution Overview
Problem
Existing purification techniques for compounds, particularly those with poor solid-liquid separation properties and low-purity mother liquor, lack sufficient impurity separation efficiency.
Innovation Solution
A method utilizing a hydraulic wash column where a portion of the melt from melted crystals is returned as a washing liquid, exceeding 30% by mass relative to the total melt, to enhance impurity separation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional purification methods using wash columns are used, then the purification process can be performed, but impurity separation efficiency is insufficient when processing slurry with poor solid-liquid separation properties
Solution Approach 1:
The invention changes the parameter of washing liquid quantity from conventional small amounts to a specific large amount (30-70 wt% of feed slurry). This parameter change enables effective washing of crystals even when the feed slurry has poor solid-liquid separation properties, thereby improving impurity separation efficiency without being constrained by the reliability of solid-liquid separation.
Solution Approach 2:
The washing liquid serves multiple functions: it washes crystals to remove impurities, controls the temperature of crystals to prevent polymerization, and maintains crystal fluidity. This multi-functionality allows the system to achieve high purification efficiency regardless of the initial solid-liquid separation quality of the feed slurry.
2Manufacturing precision
If the amount of washing liquid in the hydraulic wash column is increased, then impurity separation efficiency is improved, but the risk of pipe clogging increases
Solution Approach 1:
The invention changes the temperature parameter of the washing liquid by controlling it to be higher than the melting point of the crystal. This parameter change prevents the washing liquid from solidifying and clogging pipes, while still allowing a large amount of washing liquid (30-70 wt% of feed slurry) to be used for effective impurity separation.
Solution Approach 2:
The invention utilizes phase transition by maintaining the washing liquid in a liquid phase above the melting point of the crystal, even when the crystal itself is in solid form. This phase control prevents clogging in pipes and equipment while enabling effective washing and impurity separation.
3Productivity
If a large amount of circulation liquid is returned to the hydraulic wash column, then washing efficiency is improved, but energy consumption increases
Solution Approach 1:
The invention applies partial action by returning only a specific portion (30-70 wt% of feed slurry) of the circulation liquid to the hydraulic wash column, rather than returning all of it. This optimized amount achieves effective washing and temperature control while avoiding excessive energy consumption associated with circulating the entire liquid volume.
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
Achieves excellent impurity separation efficiency and stable production by using a larger amount of washing liquid in the hydraulic wash column, preventing pipe clogging through wall surface heating.
Implementation Method 1
a step of feeding a slurry containing crystals of the compound to a hydraulic wash column
Implementation Method 2
a step of melting crystals in a crystal-containing circulation slurry discharged from the hydraulic wash column
Implementation Method 3
preventing pipe clogging through wall surface heating
Data Source
AI summary
The present invention provides a method capable of sufficiently reducing impurities with excellent separation efficiency even from a crystal-containing slurry that contains a low-purity mother liquor and has poor solid-liquid separation properties. The present invention relates to a method for producing a compound, the method including: a step of feeding a slurry containing crystals of the compound to a hydraulic wash column; a step of melting crystals in a crystal-containing circulation slurry discharged from the hydraulic wash column; and a step of returning a portion of a circulation liquid containing a melt obtained in the melting step to the hydraulic wash column, wherein the circulation liquid returned in the returning step in an amount of more than 30% by mass relative to 100% by mass of the melt serves as a washing liquid for crystals.