A summary is given of recovery techniques during the past 30 years. Current innovations are mentioned and the recent research completed and currently in progress. Estimated recovery yields are discussed and areas of oil loss mentioned. The major uses of d-Limonene are described and the new anti-pollution law is discussed. The economics of the limonene market are shown to be tied to the turpentine market. There are comments about the future of terpene resins. Several goals for the future are presented.
Paper published with permission.