Scale-up works when each unit is sized on the right quantity, the powder flows and the knowledge travels

The study is a life cycle assessment of tannin extracts made from pine bark, cones and pruning. The moist residue weighs 3 kg against 2 kg of bark fed, so it holds liquid, and that liquid carries extract away unless the cake is pressed or washed. The dryer used 5.3 MJ of natural gas per kilogram of water removed, 2.3 times water's latent heat at its normal boiling point; the difference left as heat in the exhaust air and as equipment losses.

The extract is a tannin for leather tanning, used here only for its published balance. Our own illustrative balance of a 1,000 kg ethanol batch is on the process engineering page.

For the compressibility index and Hausner ratio, a sample of known mass is poured into a graduated cylinder (unsettled volume V₀) and tapped until the volume stops changing (V_f). A powder that packs down a lot under tapping has strong interparticle forces and flows poorly. Carriers, granulation or a glidant can change the class. Silicon dioxide as a flow agent is covered in Course 12, other ingredients.

The pharmacopoeial test stores the material at 25 °C and 80% relative humidity for 24 hours and classes it by weight gain: slightly hygroscopic from 0.2% to under 2%, hygroscopic from 2% to under 15%, very hygroscopic at 15% or more, deliquescent when it takes up enough water to form a liquid. It does not account for the water already in the sample. An isotherm gives equilibrium water content across humidity; the data used here stop at 70%, so the 80% test point lies outside them. Storage and packaging consequences are on the drying and particle engineering page.

Sugar-rich extracts have a low glass transition, so they turn sticky in the hot, humid lower part of a spray dryer and coat its walls (Bhandari et al. 1997). Adding a high-T_g carrier such as maltodextrin, lowering the outlet temperature or drying further all move the particle below the sticky point. Each costs something: carrier dilutes the active, a cooler outlet leaves more water, and drier air needs more energy.

Compressibility is solid fraction against compaction pressure, tabletability is tensile strength against pressure, and compactibility is tensile strength against solid fraction. Tye, Sun and Amidon tested four direct-compression excipients and a placebo: tabletability and compressibility of some changed with tableting speed, while compactibility of all of them was essentially speed independent. Tensile strength comes from the force F that breaks a tablet of diameter D and thickness t across its diameter: σ = 2F/(πDt).

In turbulent flow the impeller draws power P = PoρN³D⁵. With every length scaled by k, holding one quantity fixes the plant speed and moves the rest. The rule is chosen by what the step is sensitive to: dispersion and mass transfer follow power per volume, shear-sensitive material follows tip speed, and a reaction that needs fast mixing follows blend time, which is usually the most expensive to hold.

For supercritical CO₂ extraction of grape seed, keeping the solvent-to-feed ratio constant predicted the 5.15 L pilot curve from the 0.29 L laboratory one at 35 MPa and 313 K (Prado et al. 2012). For spray drying, Poozesh and Bilgili review rules for atomization, drying and gas–solid separation; Thybo et al. matched droplet size between a pilot and a production dryer and still needed production trials, because mixing and residence time differed. In the applewood study the pilot yield was lower at a solid-to-solvent ratio of 1 : 33 and at least 30% higher at 1 : 20, which the authors attribute to energy density and to suspension of the wood.

ICH Q10 defines knowledge management as a "systematic approach to acquiring, analysing, storing and disseminating information related to products, manufacturing processes and components". For dietary supplements the receiving unit's master manufacturing and batch production records are requirements of 21 CFR Part 111.

The guidance defines process validation as "the collection and evaluation of data, from the process design stage through commercial production, which establishes scientific evidence that a process is capable of consistently delivering quality product." Products made during Stage 2 can be released if acceptable, and Stage 2 must succeed before commercial distribution.

Q5E defines "comparable" as "a conclusion that products have highly similar quality attributes before and after manufacturing process changes and that no adverse impact on the safety or efficacy, including immunogenicity, of the drug product occurred." The comparison draws on routine batch analyses, in-process controls, validation data, characterization and stability. How fingerprints and markers are compared is on the purification and standardization page.