Process for carrying out pretreatment on waste oil

Abstract

The invention discloses a process for carrying out pretreatment on waste oil, which comprises steps of waste oil dissolution, addition of a disintegrant for performing a reaction, sedimentation and impurity removal, electrolysis treatment and the like. The process has the advantages that in the process for carrying out pretreatment on the waste oil, the disintegrant with the specific components and content is added, so that most of fat-soluble colloidal impurities in the waste oil are transformed into water-soluble colloidal impurities; and under the action of electrolyte, colloidal particles adsorb water and are expanded, aggregated and settled to be discharged, so that various colloidal substances and unsaponifiable matter in the waste oil are effectively removed, the quality of the refined oil is well improved, good raw material quality guarantee is provided for the subsequent esterification and ester exchange process of biodiesel, and the degree of coking and carbon deposition in the esterification process is greatly reduced.

Description

technical field [0001] The invention relates to a waste oil pretreatment process. Background technique [0002] With the increasingly tense use of energy in the world, finding various new energy sources that can replace fossil energy sources has become one of the important research tasks of all countries in the world today. Biodiesel has attracted much attention in recent years because of its great advantages in power performance, environmental protection performance and safety performance, and has developed rapidly. [0003] At present, the production process of large-scale industrial production of biodiesel is mainly chemical method, which is the process of methyl esterification of oil and methanol under certain conditions of temperature, pressure and catalyst. A large number of actual operation conditions show that this method will produce a large amount of coking, carbon deposition, and colloidal substances during the reaction process, which seriously affects the stable...

AI Technical Summary

Problems solved by technology

A large number of actual operation conditions show that this method will produce a large amount of coking, carbon deposition, and colloidal substances during the reaction process, which seriously affects the stable operation of production and the quality of subsequent products. An important reason for the above problems is that The waste oil used as raw material contains a considerable amount of peptizing impurities such as phospholipids, proteins, mucus, glycosyl diglycerides and unsaponifiable substances such as aliphatic polymers and complex metal salts. During the pretreatment process of waste oil, The degree of removal of these unsaponifiable components has a great influence on the subsequent esterification process of biodiesel production, the continuous operation of the refining process and product quality

[0004] Traditional oil refining processes include filtration, hydration, alkali refining, acid refining, and clay adsorption. These methods can effectively remove most of the mechanical impurities, water-soluble impurities and fat-soluble impurities in conventional animal and vegetable oils with relatively stable components, but for waste oils, due to their unstable sources, oil The species are not fixed, especially the high-temperature polymers and oxides contained in waste catering oil, which greatly increase the number and content of unsaponifiable components in waste oil, and it is difficult to effectively remove unsaponifiable components only by using the above-mentioned traditional methods