[Glycerin supply and sales] What is the difference between crude glycerin and refined glycerin?

glycerin (also known as glycerin) is colorless, odorless, and tasteless sweet, an organic substance that appears as a clear, viscous liquid. it is miscible with water, alcohols, amines and phenols in any proportion, and the aqueous solution is neutral. glycerin is a polyol moisturizer. the hydroxyl groups in the molecular structure can form hydrogen bonds…