Method for preparing unrefined SAF intermediate using polyols and the SAF intermediate prepared thereby

A method for preparing unrefined Sustainable Aviation Fuel (SAF) using polyols, comprising the following steps:

• adding a catalyst to a reaction kettle, then adding a polyol solution to fill the reaction kettle;
• sealing the reaction kettle, introducing a gas into the reaction kettle to discharge excess polyol solution and replace the atmosphere in the reaction kettle;
• stirring thoroughly to mix the catalyst uniformly with the polyol solution;
• then continuing to introduce the gas into the reaction kettle to increase an internal pressure;
• subsequently conducting a reaction, and after the reaction is completed, collecting an upper liquid product to obtain unrefined SAF;
• wherein the polyol is selected from the group consisting of glycerol, ethylene glycol, sorbitol, mannitol and xylitol;
• a solvent of the polyol solution is selected from the group consisting of water, ethanol and methanol, wherein the mass ratio of the polyol to the solvent is selected from (3-10):(0-5);
• wherein the gas is selected from the group consisting of helium, nitrogen, and carbon dioxide;
• wherein the catalyst is selected from the group consisting of a monometallic metal-organic frameworks (MOF) catalyst and a bimetallic MOF catalyst;
• wherein the monometallic MOF catalyst is synthesized through a sequential protocol:
• the metal A salt solution is mixed with the ligand solution, stirred thoroughly, and subjected to a hydrothermal reaction;
• the resulting product is then washed, dried, and calcined to obtain monometallic MOF catalyst;
• and the metal salt in the mentioned metal salt solution A is selected from the group consisting of the salts of Mn, Cr, Fe, Co, Ni, Cu, and Zn;
• wherein the bimetallic MOF catalyst is synthesized through a sequential protocol:
• the monometallic MOF catalyst is added to metal salt solution B and allowed to react, yielding a metal-doped monometallic MOF catalyst;
• the doped catalyst is then washed, dried, and calcined to obtain a bimetallic MOF catalyst;
• the metal salt in the described metal salt solution B is selected from salts of Mn, Cr, Fe, Co, Ni, Cu, or Zn, wherein the metal used in the metal salt solution B differs from the metal species in the monometallic MOF catalyst;
• and
• wherein the unrefined SAF comprises 2,5-hexanedione, 2-acetylfuran, 2,4-dimethyl-2-(hydroxymethyl)-1,3-dioxolane, 2-oxooctanoic acid, (allyloxymethyl) oxirane, glycerol formal, 2,6-bis(hydroxymethyl)-1,4-dioxane, and ethylene glycol diglycidyl ether.