Butylene glycol and propylene glycol are common organic compounds. Their main uses are as follows:

Butanediol is mainly used in the manufacture of solvents, plastics, coatings, pigments, resins, fibers, etc. It can also be used to make softeners, refrigerant fluids, heat exchange fluids, etc.
Propylene glycol is mainly used in the manufacture of coatings, resins, paints, fibers, etc. It can also be used in the manufacture of medicines, spices and food additives.
Both butylene glycol and propylene glycol can be used as smoke thickeners in tobacco to make the smoke richer.
Butylene glycol and propylene glycol can also be used in the synthesis of dyes and pigments to increase their stability, softness and solubility.
Butylene glycol and propylene glycol can be used as one of the raw materials for synthetic resin. The synthetic resin has good flexibility, plasticity and durability.