Separation Process Design In Plant-based Lubricating Oil Production Process

The continuous innovation and development of the global industrialization wave not only put forward higher requirements for the production of lubricants on a global scale,but also put forward higher standards for lubricants that can be used in a variety of complex working conditions.Using natural vegetable oils as raw materials is an important way to develop new sources of lubricating oil production.The production of polyol ester lubricating oils through biological enzyme catalysis also brings a new direction for the green synthesis of lubricating oils.This paper takes the separation section of the plant-based lubricant production process with an annual output of 100 tons as the research objective,and uses Aspen Plus to optimize the design of each separation process.In this paper,the separation process of the oxidative pyrolysis product obtained by chemical modification of vegetable oleic acid is designed.Thirteen components with a content of more than 1%were selected as the raw materials for the simulation calculation,and a four-tower cascade distillation scheme was designed to refine the intermediate pelargonic acid and the high-value by-product methyl hydrogen azelate.Under the optimized operating conditions,the purity of nonanoic acid product reached 99.02%,the recovery rate exceeded 95%,the purity of methyl azelate product reached 99.11%,the recovery rate exceeded 96%,and other pyrolysis products can be sold as biodiesel.The plant-based lubricating oil crude product catalyzed by biological enzymes was optimized for the refinement process design,and two refining schemes were proposed:? Remove nonanoic acid and unsaturated esters from the crude product at the same time through single-tower vacuum distillation.After the rectification tower is simulated and optimized,the calculated content of trimethylolpropane trinonyl ester in the final lubricating oil product is 99.53%,the nonanoic acid content is less than 1*10-18,and the triester recovery rate reaches 91.6%,per kilogram The energy consumption of the product is 2460 kJ.? A two-stage separation scheme combining flash evaporation and vacuum rectification,using a flash tank to roughly remove pelargonic acid,and then introducing a vacuum rectification tower to refine the triester product,and the product obtained by the second separation contains trihydric The output of methyl propane trinonyl ester is 98.97%,the content of nonanoic acid is less than 1*10-18,the recovery rate of triester reaches 85.76%,and the energy consumption per kilogram of product is about 2063 kJ.On the basis of meeting the product purity requirements and annual output,the energy consumption of the second program is 16.14%lower than that of the first program.