A method of optimizing a high-speed chemical reaction using an automated microreactor comprising a raw material supply unit, an intermediate reaction unit, an intermediate reaction control unit, and a product reaction unit, the method comprising:
- (a) controlling a flow rate of each of a plurality of raw materials comprising first, second, and third raw materials using a plurality of flow rate controllers of the raw material supply unit, respectively and supplying the plurality of raw materials at the controlled flow rates;
- (b) producing a first mixture by mixing the first and second raw materials supplied from the raw material supply unit in any one of a plurality of micromixers for intermediate of the intermediate reaction unit, and producing an intermediate product by causing a reaction of the first mixture in at least one of a plurality of tubular reactors for intermediate;
- and
- (c) producing a second mixture by mixing the intermediate product supplied from the intermediate reaction unit and the third raw material supplied from the raw material supply unit in a product micromixer of the product reaction unit, and preparing a product, wherein a valve member of the intermediate reaction control unit controls a length of the tubular reactor for intermediate and at least one type of multiple types of the second raw material being supplied.