Cohobation column was installed in Tabib Daru Company for the first time. The technology of this instrument is belonged to Germany and is used in many Bulgarian companies; The Cohobation is used to extract essential oils from plants with low yield of essential oils like Rosa damascena. Tabib Daru Company is one of the largest producers of Rose oil in Iran and In order to produce the best qualified Rose oil and phenyl ethyl alcohol, it has purchased and installed it in its factory.