NOVELTY - Improvement of food grade liquid carbon dioxide product comprises taking raw material containing carbon dioxide gas, impurities, and chemical reactants with excess oxygen through water separator to remove water; introducing into compression process for compression via first stage compressor at 0.1-0.35 MPa, secondary compressor at 0.8-1.2 MPa, and third compressor at 2.3-2.8 MPa; passing into desulfurizer; and sending product into dealkylation process to remove methane and ethylene in carbon dioxide gas containing impurities.    USE - Improvement of food grade liquid carbon dioxide product (claimed).    ADVANTAGE - The method improves food grade liquid carbon dioxide product yield.    DETAILED DESCRIPTION - Improvement of food grade liquid carbon dioxide product comprises taking raw material containing carbon dioxide gas, impurities, and chemical reactants with excess oxygen through water separator to remove water; introducing into compression process for compression via first stage compressor at 0.1-0.35 MPa, secondary compressor at 0.8-1.2 MPa, and third compressor at 2.3-2.8 MPa; sending into desulfurizer; sending carbon dioxide gas containing impurity and chemical reaction slightly excess of oxygen into dealkylation process to remove methane and ethylene in carbon dioxide gas containing impurities; sending to purification process and performing temperature swing adsorption to adsorb impurity; purifying via adsorbent for selectively adsorbing microsteam of ppm level from desulfurization of carbon dioxide gas containing impurities and ppb grade benzene to purify desulfurized carbon dioxide gas containing impurities; sending to liquefaction working procedure and distilling and purifying to obtain flash steam containing liquefied impurities, uncondensed methane, ethylene and oxygen; passing flash steam in lower and upper corrugated structured packing to obtain flash steam containing uncondensed carbon dioxide gas; and discharging methane, ethylene, gas mixture of oxygen from bottom of distillation purification tower top.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of a process for producing food grade liquid carbon dioxide product (Drawing includes non-English language text).