Continuous processing: highly automated, minimal labour costs, less energy to maintain. eg.ammonia, sulphuric acid. Inefficient when not in constant use, high set-up cost.
Batch processing: fixed amount, made when needed, 'sell by' date, easy to change production. eg.pharmaceuticals. Labour intensive and costly, long time to clean for product change, inefficient.
Drug development can be really expensive because:
- It takes 10 years to develop (staffing costs).
- Many different compounds need to be tested.
- Raw plant materials are difficult to extract, expensive and rare.
- Chromotography is used to separate and isolate potentially useful compunds.
- Products need to be tested on humans.
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