INDUSTRY|chemistry|chemical industry
- barrdhriogáit Reference Faomhadh an téarma seo mar chuid de Thionscadal Lex
- ga
- overhead | overhead product | top product | head product
- en
- Definition the product leaving the top of the distillation column Reference "COM-Terminology Coordination, based on:Randel M. Price, http://facstaff.cbu.edu/rprice/ > Lecture Notes > Distillation I: Principles, http://facstaff.cbu.edu/rprice/lectures/distill.html [16.3.2015]"
- Comment "The product leaving the top of the column is called the overhead product, the ""overhead"", the ""top product"", the distillate, or ""distillate product"". Distillate product may be liquid or vapor (or occasionally both) depending on the type of condenser used. Most of the time the distillate flow rate is assigned the symbol D, and the composition xD or yD.The product leaving the bottom of the column is called the bottom product or ""bottoms"", and given the symbol B, with composition xB.In some situations, notably petroleum refining, one or more intermediate or ""sidedraw"" products may be removed from the column.Vapor leaving the top of the column passes through a heat exchanger, the condenser, where it is partially or totally condensed. The liquid which results is temporarily held in the ""accumulator"" or reflux drum. A liquid stream is withdrawn from the drum and returned to the top tray of the column as reflux (R or L) to promote separation."
- distillat de tête | produit de tête | produit de tête de distillation
- fr
- Definition "fraction la plus volatile du produit traité passant en tête de distillation ; Un distillat léger, extrait d'un pétrole brut, par une distillation à la pression atmosphérique donnant du "" naphta"" et aussi du kérosène éventuellement.(1)" Reference NF M 06-001:1968 ; Fed.eur.du génie chimique