Chemical reaction method

A chemical reaction method, comprising the steps of:

• preparing a chemical reaction apparatus comprising the steps:
• partitioning an inside of a horizontal flow reactor into multiple chambers by multiple partition plates, and flowing a liquid content horizontally with an unfilled space being provided thereabove;
• generating microwaves with a microwave generator;
• and
• transmitting the microwaves generated by the microwave generator, with at least one waveguide, to the unfilled space in the reactor;
• forming a top portion of the partition plates act as a weir;
• configuring a weir height of each of the partition plates in the reactor;
• at least one of:
• calculating an angle θ as;
• θ=sin−1(H/L)
• wherein L is a shortest length, in a length direction of the reactor, of each of the chambers, and H is an overflow depth obtained using the following equation:
• 15eQ=√{square root over (2g)}CN{4(b−a)H5/2+10aeH3/2}
• wherein Q is a flow rate of the liquid content, a is a width of a bottom of a trapezoidal flow path, b is a width of an upper side of the trapezoidal flow path, e is a height from the bottom to the upper side of the trapezoidal flow path, C is a flow coefficient, N is a number of trapezoidal flow paths formed at each of the partition plates where each of the partition plates includes one or more trapezoidal flow paths, and g is an acceleration of gravity;
• or
• obtaining the angle θ by reading from a storage medium in which the angle θ was calculated and stored in advance;
• inclining the reactor at an angle of inclination of at least the angle θ;
• and
• flowing the liquid content over each of the partition plates inside the reactor;
• wherein the weir height of each of the partition plates in the reactor is the same in a state where the reactor is not inclined, and
• wherein the weir height on the inlet side is higher than the weir height on the outlet side by the overflow depth at each of the partition plates on the outlet side where the reactor is inclined at the angle θ.