MX2015017118A - Obtaining corrosion inhibitors from the use of avocado waste. - Google Patents

Abstract

The present disclosure is related to the discovery of an integral and useful application of avocado waste, including in an integral manner: shells, pulp and seeds for the production of high efficiency corrosion inhibitors by extracting the avocado oil from said waste and its chemical processing. Technically, the oil extraction from the avocado waste can be performed by known processes, typically involving dehydration at medium temperatures, Soxhlet extractors, solvents, mechanical pressing, cold pressing, or spinning. Oil transformation into corrosion inhibitors can be accomplished using typically known processes such as the KOH catalyzed transesterification, aminolysis at temperatures between 140-145°C with amines such as aminoethylethanolamine (AEEA), or polyamines such as diethylenetriamine (DETA), Aminoethylethanolamine (AEEA), Ethylenediamine (EDA), or triethylenetetramine (TETA), and pressure heating. A peculiar element of this invention consists in the identification of the par ticular characteristics of the fatty acids contained in the non-edible crude avocado oil, involving more than 80% of unsaturation in the molecular structure of the alkyl chain of triglycerides. This peculiar characteristic of the avocado oil confers to the amides and imidazolines mixture, a greater efficiency as corrosion inhibitors due to the superior adhesion to the metal surfaces, derived of the interaction of the unsaturation of the P electrons with the electrons in the metal surface (FIG. 3). The present invention represents a useful solution for the significant reduction of the avocado harvest in the agricultural fields, as well as an additional reduction percentage in the transport distribution and commercialization processes due to the highly perishable nature of the product. The corrosion inhibitors produced by this invention are applicable in the preservation of the operational integrity of pipelines, tanks and other industrial facilities that involve the use and handling of hydrocarbons in their liquid or gaseous state.