Open unloading truck. The unloading method of trimethylamine tank truck is open unloading, that is, the vent line valve of the trimethylamine storage tank is opened, the pipeline is led into the pool, and the trimethylamine liquid in the tank truck is discharged into the tank truck using its own pressure. Trimethylamine is the simplest tertiary amine. It is a colorless gas at room temperature with a fishy odor. It is soluble in water, ethanol, and ether, and is flammable and toxic.