Method for coprocessing glycerol and heavy oil in hydrothermal mode to simultaneously obtain lactic acid and light oil

Abstract

The invention relates to a method for coprocessing glycerol and heavy oil in a hydrothermal mode to simultaneously obtain lactic acid and light oil, which comprises the following steps: dissolving a certain amount of glycerol in an alkaline water solution, preheating the water solution and heavy oil through a heat exchanger, sending into a reactor to carry out reaction, cooling the reaction products through the heat exchanger, and separating out a gas phase component, a liquid phase component and an oil phase component, wherein the gas phase component mainly comprises hydrogen, and can be used for catalytic hydroprocessing of heavy oil after being purified; the liquid phase component mainly comprises lactates which can be purified and acidified to obtain lactic acid; and the oil phase component can be heated through the heat exchanger and then be treated in a fractionating tower to obtain light products of the heavy oil, such as gasoline, diesel oil, fuel oil and the like. Compared with the prior art, the invention converts glycerol into lactic acid in a hydrothermal mode, converts heavy oil into light oil while generating hydrogen from glycerol by hydrothermal reaction, and also has the functions of saving the energy, protecting the environment and removing sulfur, nitrogen and metallic impurities.

Description

Hydrothermal co-processing method of glycerin and heavy oil to simultaneously obtain lactic acid and light chemical oil technical field The invention relates to the fields of waste resource recovery technology and energy, in particular to a method for hydrothermally co-processing glycerin and heavy oil to simultaneously obtain lactic acid and light chemical oil. Background technique Petroleum and other fossil resources on the earth are formed by the slow settlement of organic waste on the ground to the ground, under the action of high temperature and high pressure environment and microorganisms, and gradually formed after a long geological age. From the perspective of the natural carbon cycle, the excessive exploitation and use of fossil energy by human beings has broken the carbon cycle balance formed by the long geological age, thus triggering a series of natural disasters caused by climate anomalies. Therefore, in order to save resources and improve the environment, hum...

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Problems solved by technology

The application of hydrothermal technology in the upgrading of heavy oil, Chinese patent CN200610026906.6 discloses a method for preparing light oil from supercritical water modified vacuum residue, which basically avoids the coking reaction of heavy oil compared with thermal cracking , but due to the low partial pressure of hydrogen in the reaction system, the effect on the treatment of other inferior heavy oils is still unsatisfactory

Chinese patent CN200810228351.2 discloses a method for upgrading heavy oil under supercritical or subcritical conditions of a hydrogen-donating solvent. Due to the use of a hydrogen-donating solvent, the production cost is high, which reduces the feasibility of the practical application of the method

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