Catalytic-esterification-free acid-degrading process for continuous production of high-acid-value waste oil and fat glycerin

Abstract

A catalytic-esterification-free acid-degrading process for continuous production of high-acid-value waste oil and fat glycerin comprises the steps of raw material mixing and delivery, mixed raw material and finished product heat exchange, mixed raw material preheating after heat exchange, flash evaporation and dehydration of mixed raw materials, continuous esterification reaction and separation of glycerin extracted in the esterification process. The problems of low esterification reaction speed and non-thorough esterification caused by untimely reaction moisture discharging due to low reaction temperature in the process of preparing biodiesel by using high-acid-value waste cooking oil and leftovers in oil production industry and using methyl alcohol as an esterifying agent for pre-esterification and acid decrease are effectively solved, and the problems of device corrosion and environmental pollution brought by a large amount of produced waste acid water due to the fact that sulfuric acid is added to serve as a catalyst in the esterification process is solved. A continuous production process is adopted for esterification reaction, heat exchange of raw materials and finished products is achieved in the continuous process, and the problems of frequent and complicated operation, high labor cost, high production energy consumption, small yield and low efficiency of an intermittent esterification process are solved.

Description

technical field [0001] The invention uses low-cost waste oil with high acid value as a raw material to prepare biodiesel pre-esterification and acid reduction technology, and belongs to the fields of waste reuse and circular economy. It specifically relates to an energy-saving and high-efficiency high-acid-value waste oil glycerin non-catalyzed esterification and acid-reducing continuous production process. Background technique [0002] As the reserves of traditional petrochemical energy are dwindling, new renewable energy is getting more and more attention. As a substitute for petrochemical diesel, biodiesel has attracted widespread attention from all over the world because of its excellent performance and environmental friendliness. As biodiesel is a renewable clean energy, the development of biodiesel industry is of great significance to protect the environment and reduce dependence on petroleum. [0003] Biodiesel is fatty acid methyl ester (FAME) or ethyl ester fuel ...

AI Technical Summary

Problems solved by technology

[0006] Technical problem to be solved: the purpose of this invention is to provide an energy-saving and efficient high-acid value waste oil glycerin non-catalyzed esterification and acid-reducing continuous production process, which effectively solves the problem of using high-acid value food waste oil and oil industry scraps to prepare Biodiesel pre-esterification acid reduction uses methanol as the esterification agent due to the low reaction temperature and the inability to remove the reaction water in time, resulting in slow esterification reaction speed and incomplete esterification, and equipment caused by adding sulfuric acid as a catalyst during the esterification process Corrosion and the production of a large amount of waste acid water to pollute the environment

The esterification reaction adopts a continuous production process, which realizes heat exchange between raw materials and finished products during the continuous process, and solves the problems of frequent and complicated operations, high labor costs, high production energy consumption, and low output and low efficiency caused by the intermittent esterification process

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