Hot Roller Compaction for Solvent-Free Pharmaceutical Granulation
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Solution Overview
Problem
The pharmaceutical industry lacks a cost-effective and solvent-free process for preparing granules of moisture-sensitive active ingredients that can be used to produce tablets and capsules, as existing methods like wet granulation are inefficient and require solvent recovery.
Innovation Solution
A hot roller compaction process and apparatus that heats the binder above its glass transition temperature to form agglomerates, which are then milled into granules suitable for tablet or capsule formation, using a roller compactor with heating means such as hot oil, electric, or steam, and suitable binder ingredients like polymers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wet granulation is used to prepare granules of active ingredients, then granules can be formed, but solvent recovery is required and the process is not cost-effective
Solution Approach 1:
The invention changes the physical state and temperature parameters of the binder by heating it above its glass transition temperature during roller compaction. This parameter change allows the binder to become more pliable and form agglomerates without requiring external solvents, thereby eliminating solvent recovery requirements while maintaining granule formation capability
Solution Approach 2:
The invention extracts and eliminates the solvent component from the granulation process entirely. By using heat-activated binder melting instead of solvent-based wet granulation, the process removes the harmful solvent recovery step while achieving the same granule formation objective
2Productivity
If wet granulation with alcohol or volatile solvents is used, then granules can be prepared, but solvent recovery equipment and processes are required
Solution Approach 1:
The invention extracts and removes the solvent recovery system from the manufacturing process by replacing solvent-based wet granulation with hot roller compaction. This eliminates complex solvent recovery equipment while maintaining efficient granule preparation through heat-activated binder melting
Solution Approach 2:
The invention substitutes the mechanical solvent recovery system with a thermal process. Instead of using mechanical separation and recovery equipment for solvents, the process uses controlled heating above the glass transition temperature to activate binder melting and agglomerate formation, thereby eliminating the need for complex solvent recovery infrastructure
3Reliability
If conventional compression is used for moisture sensitive drugs, then tablets can be formed, but dissolution properties may be compromised
Solution Approach 1:
The invention changes the temperature parameter during granulation by heating the binder above its glass transition temperature, which improves dissolution properties through better binder activation and agglomerate formation. For moisture-sensitive drugs, the process maintains drug stability by using controlled, localized heating that avoids excessive temperatures and prolonged exposure, thereby resolving the contradiction between dissolution enhancement and drug stability
Solution Approach 2:
The invention performs preliminary binder activation by heating the binder above its glass transition temperature before compression. This preliminary thermal treatment prepares the binder for optimal binding activity, ensuring good dissolution properties while the controlled nature of the heating process protects moisture-sensitive drugs from degradation
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 method provides a one-step, solvent-free process for producing granules with excellent dissolution properties, suitable for moisture-sensitive drugs, enabling efficient production of tablets and capsules with consistent hardness and density.
Implementation Method 1
heating means associated with said compactor to heat the binder above its glass transition temperature
Data Source
AI summary
A process and apparatus for forming agglomerates of a powder composition of an active and binder such as a homopolymer or copolymer which includes passing the composition through a hot roller compactor to heat said binder material above its glass transition temperature.