Technical Introduction

Tetrahydrofuran, abbreviated as THF, is a colorless, volatile, water-miscible cyclic ether with a characteristic ethereal odor. It is one of the most versatile and widely used organic solvents in chemical, pharmaceutical, and polymer industries.

1. Chemical Identity

Chemical Formula: C4H8O
Structural Formula: A five-membered heterocyclic compound containing one oxygen atom and four carbon atoms (cyclic ether structure)
CAS Registry Number: 109-99-9
UN Number: 2056 (Class 3 Flammable Liquid)
Molecular Weight: 72.11 g/mol

2. Industrial Applications

THF is valued for its excellent solvency for polar and nonpolar compounds, making it indispensable in multiple industries:
Polymer Industry: The primary raw material for the production of polytetramethylene ether glycol (PTMEG), a key component of spandex fibers (Lycra), thermoplastic polyurethanes (TPU), and elastomers. Also used as a solvent for polyvinyl chloride (PVC), polyacrylonitrile (PAN), and cellulose acetate.
Organic Synthesis: A universal solvent for Grignard reactions, lithium aluminum hydride reductions, and other organometallic reactions. It serves as a reaction medium for the synthesis of pharmaceuticals, agrochemicals, and specialty chemicals.
Pharmaceutical Industry: Used in the formulation of drug intermediates, and as a solvent for active pharmaceutical ingredients (APIs) with poor water solubility.
Revestimentos e adesivos: Acts as a high-boiling solvent for polyurethane coatings, epoxy resins, and pressure-sensitive adhesives, improving film formation and adhesion.
Outras utilizações: Extraction solvent for natural products (e.g., essential oils, plant extracts); component of battery electrolytes for lithium-ion batteries; solvent for printing inks and dyes.