The chemical,pharmaceutical process research and development is an important link, which involves technology transformation and large-scale production from laboratory to factory.The process research and developmentis generally divided into three stages: small test, pilot test and industrial scale-up.Each stage has its own characteristics and difficulties,and needs to be adjusted and optimized according to different conditions and requirements.This article will briefly introduce the concepts,purposes,tasks and methods of these three stages, and share some experiences and considerations.

The pilot stage refers to the process research conducted in the laboratory or small equipment.The main purpose is to explore and develop suitable synthesis routes,reaction conditions,separation and purification methods,etc., to obtain product samples that meet quality requirements,and to Products are analyzed and identified.Tasks in the pilot phase include:

Determine the best synthesis route,that is,choose a solution with fewer synthesis steps,high overall yield,abundant and cheap raw material sources,and simple equipment technical conditions and process flow.

Use industrial-grade raw materials instead of chemical reagents, examine the impact of raw material purity, moisture content, impurities, etc. On the reaction, and determine appropriate raw material specifications and quality standards.

Study the effects of reaction parameters, such as temperature, pressure, time, solvent, catalyst, etc., on reaction rate, conversion rate, selectivity, etc., to determine the best reaction conditions.

Study the impact of post-processing methods, such as extraction, separation, crystallization, filtration, drying, etc., on product yield, purity, morphology, etc., and determine the best post-processing conditions.

Research ways to recycle raw materials and solvents to reduce costs and waste.

Study safety production and environmental protection issues, avoid the use of toxic and harmful substances or the generation of dangerous gases, and take corresponding protective measures.

Carry out material accounting and calculate raw material consumption, product output, unit consumption indicators, etc.

Establish product quality control methods and quality standards, and conduct analysis and testing of products.