Systems and methods for synthesizing chemical products, including active pharmaceutical ingredients

A system for producing a chemical product, comprising:

• a first module comprising a first unit operation which is a reactor, a second unit operation which is a separator fluidically connected to the first unit operation in parallel, and a first bypass conduit fluidically connected to the first unit operation and the second unit operation in parallel;
• and
• a second module fluidically connected to the first module in series, the second module comprising a third unit operation which is a separator, a fourth unit operation fluidically connected to the third unit operation in parallel, and a second bypass conduit fluidically connected to the third unit operation and the fourth unit operation in parallel;
• wherein the first module has a first arrangement of unit operations, and the second module has a second arrangement of unit operations that is different from the first arrangement of unit operations.

A system for producing a chemical product, comprising:

• a first module comprising a first unit operation which is a reactor, a second unit operation which is a separator fluidically connected to the first unit operation in parallel, and a first bypass conduit fluidically connected to the first unit operation and the second unit operation in parallel;
• a second module fluidically connected to the first module in series, the second module comprising a third unit operation which is a separator, a fourth unit operation fluidically connected to the third unit operation in parallel, and a second bypass conduit fluidically connected to the third unit operation and the fourth unit operation in parallel;
• and
• a conduit fluidically connected to the second module, the conduit containing diphenhydramine, lidocaine, diazepam, fluoxetine, ibuprofen, doxycycline, and/or atropine.