Quaternary ammonium compounds are prepared by the alkylation of tertiary amines with a halocarbon. The chemical compound trichloroethylene is a halocarbon commonly used as an industrial solvent. Prior to 1985, the persistent halocarbon DBCP was a widely used nematicide and soil fumigant. However, it swells slightly in halocarbon compounds, ethers, esters and aromatic compounds. But the Rowland-Molina hypothesis was strongly disputed by representatives of the aerosol and halocarbon industries. PHC is made from bromoform, a liquid halocarbon that is commercially manufactured from methane. In this role, it has supplanted halocarbon compounds (Freon). One halocarbon, sucralose, is a sweetener. English therefore has words like "halogen", "halide", "halotrichite" and the hybrid "halocarbon".