Although flow photochemistry has significant potential in advancing sustainable processing, there are substantial hurdles to attaining this. Development in three key areas over the past 3 years are discussed here: 1) light source technology; 2) reactor design; and 3) process understanding and intensification. A small number of illustrative examples provide an insight on the benefits that can be accessed through advances in these areas. More in-depth knowledge and experimentation around wavelength dependence can enhance efficiency and selectivity in transformations. Reactors capable of handling solid–liquid reactions can allow reliable processing of metal-free and recyclable catalyst systems. Concentrating and accelerating transition-metal/photoredox coupling methodologies make these processes increasingly attractive. Continuation of these trends will undoubtedly lead to future large-scale applications, carried out in a sustainable manner.

尽管流动光化学在推进可持续加工方面具有巨大潜力，但要实现这一目标仍存在许多障碍。这里讨论了过去三年中三个关键领域的发展：1）光源技术；2）反应堆设计；3）对过程的理解和强化。少数说明性示例提供了对这些领域中的进步可以获取的益处的深刻见解。关于波长依赖性的更深入的知识和实验可以提高转换的效率和选择性。能够处理固液反应的反应器可以可靠地处理无金属且可回收的催化剂体系。集中和加速过渡金属/光氧化还原偶联方法使这些过程越来越有吸引力。