Morpholine, molecular-type c4h9no, or written as O (CH2CH2) 2NH. It is a strong alkali, mainly used as a solvent for dyes, resins and waxes, and can also be used as an emulsifier. This heterocyclic compound belongs to both amine and ether, and the secondary amine nitrogen atom makes the morpholine alkaline. Morpholine and hydrochloric acid react to produce hydrochloride morpholine.