It depends a lot upon the conductivity of the reaction mix.

If there is acid present, then there will be ionic species in the mix, which will increase the conductivity, in which case there will not be a problem with static electricity. However, if all the reactions are with species that are not ionic, then there is a risk of static build-up.

There is no way of earthing an electrical insulator, and electrical insulators are where static electricity is most likely to be found. Inserting an earthed conductive rod into a charged insulator is akin to erecting a lightning conductor in a thunderstorm - it increases the risk of a static spark being produced.

Generally speaking, pipe velocities below 1m/s in organic liquids do not give rise to static electricity hazards.

It can be shown that turbulence in ultrapure water piping can give rise to static electricity problems that persist for a few metres downstream of the turbulence point, and this phenomenon can affect the readings given by some types of ultrasonic flowmeters.

Most pharmaceutical bulk manufacture takes place under an inert gas blanket. By excluding oxygen from the environs of the reaction, even if a spark discharge were to occur, there is generally insufficient oxygen around to support combustion or explosion. Nitrogen is the most popular inerting gas and there are many special precautions to be taken using this gas as it is an asphyxiant. A preliminary discussion with bulk gas suppliers would be a useful next step. In the UK, telephone calls to customer support at both British Oxygen and Air Products (usual disclaimer) would prove valuable.