Dry Granulation Gas Stream Separation for Pharmaceutical Tablets
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Solution Overview
Problem
Dry granulation methods in the pharmaceutical industry face challenges in producing granules with good flow characteristics and homogeneity, leading to issues such as segregation, capping, and sub-optimal disintegration in tablets, due to the formation of solid bridges and electrostatic forces, and the difficulty in managing process conditions for consistent production.
Innovation Solution
A method involving the application of a compaction force to produce a compacted mass of fine particles and granules, followed by separating fine particles and small granules from the rest using a gas stream, resulting in a homogeneous and compressible granulate mass without solid bridges, using a roller compactor and fractionating device that entrains fine particles in a gas stream, allowing for the production of granules with improved flowability and tabletability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dry granulation is used to avoid liquid adverse effects on APIs, then API stability is improved, but granule flow characteristics and homogeneity deteriorate
Solution Approach 1:
The granulation process is segmented into distinct zones: a compaction zone where particles are compressed to form granules, and a separation zone where fine particles are removed. This segmentation allows the process to maintain API stability through dry granulation while improving granule homogeneity by eliminating fine particle contamination.
Solution Approach 2:
Fine particles are extracted from the granulated material using a gas stream that carries them away from the main granule mass. This extraction removes the harmful fine particles that cause poor flow characteristics and segregation, while preserving the stable granules formed by dry granulation.
2Strength
If compaction force is applied to produce granules, then granule strength is improved, but fine particle formation and segregation increase
Solution Approach 1:
The fine particles that are harmful for segregation are converted into a useful separation mechanism. The gas stream selectively entrains these fine particles, and they are collected separately or recycled. This converts the harmful segregation issue into a controlled separation process that improves overall granulate homogeneity.
Solution Approach 2:
A gas stream is introduced as an intermediary medium between the compacted granules and the fine particles. This gas stream selectively interacts with the fine particles, carrying them away from the granule mass without affecting the stronger granules, thus resolving the homogeneity issue while preserving granule strength.
3Ease of manufacture
If roller compaction is used for dry granulation, then processing simplicity is improved, but difficulty in managing process conditions for consistent production increases
Solution Approach 1:
The system incorporates feedback mechanisms where the characteristics of the granulated material are monitored and used to adjust process parameters. The separation zone provides continuous removal of fine particles, and the system can be controlled to maintain consistent granule properties by adjusting gas stream velocity, compaction force, or residence time based on material characteristics.
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 produces granules with enhanced flowability and compressibility, reducing segregation and capping issues, and achieving consistent tablet quality with improved disintegration characteristics, suitable for a wide range of pharmaceutical and food industry applications.
Implementation Method 1
a compaction force is applied to the powder to produce a compacted mass
Implementation Method 2
separating fine particles and/or small granules from the other granules by entraining the fine particles and/or small granules in a gas stream
Data Source
AI summary
A dry-granulation method for producing a tablet comprising (a) pharmaceutical active ingredient in an amount 50-90% w/w and (b) one or more excipients in an amount 10-50% w/w including at least a binder which comprises (i) preparing granules from a powder comprising a binder, a pharmaceutically active ingredient and optionally one or more other excipients or pharmaceutical active ingredients by a process characterized in that a compaction force is applied to the powder to produce a compacted mass comprising a mixture of fine particles and granules and separating and removing fine particles and/or small granules from the granules by entraining the fine particles and/or small granules in a gas stream in which the compacted mass flows, wherein the direction of the flow of the gas stream has a component which is contrary to that of the direction of flow of the compacted mass, and collecting the accepted granules (ii) blending the accepted granules with other components of the tablet in granular or fine powder form wherein in step (ii) at least one other component of the tablet formulation is in granular form and is prepared from a powder comprising said other component by a process characterized in that a compaction force is applied to the powder to produce a compacted mass comprising a mixture of fine particles and granules and separating and removing fine particles and/or small granules from the granules by entraining the fine particles and/or small granules in a gas stream in which the compacted mass flows, wherein the direction of the flow of the gas stream has a component which is contrary to that of the direction of flow of the compacted mass; and (iii) compressing the resultant blend to form a tablet; with the proviso that the tablet does not comprise (a) paracetamol, maize starch and microcrystalline cellulose in a ratio of 60:20:20 w/w, (b) acebutolol HCl and starch in a ratio of 90:10 w/w, (c) sodium valproate, hypromellose and maize starch in a ratio of 90:5:5 w/w, (d) ketoprofen and maize starch in a ratio of 50:50 w/w or (e) metformin HCl, microcrystalline cellulose and maize starch in a ratio of 80:14:6 w/w.