Can a known chemical reaction be patented for a new use?

You can apply for a patent. In the field of chemistry, it is patentable to use known reactions for new purposes. According to the provisions of the patent law, as long as it meets the requirements of patent application, that is, it is novel, creative and practical, and does not fall within the scope of patent protection stipulated by law, you can apply for a patent. Therefore, a chemical reaction can be applied to a new field, with new technical effects and application prospects, and can apply for patent protection.