NOVELTY - Hydrogenation process involves mixing of biomass (10 parts) with calcium formate (3-10 parts) in water (30-60 parts) with stirring to obtain a mixture. The mixture is heated at 40-60 degrees C for 0.5-2 hours, then dried in an oven at 80-110 degrees C for 16-24 hours to obtain a dried sample mixture. The dried mixed sample is dipped into liquid and cracking reaction is performed at 500-600 degrees C for 2-3 seconds to obtain a reaction product. The reaction product comprises bio-oil, non-condensing gas, solid pyrolysis carbon and calcium carbonate.    USE - Hydrogenation process used for preparing biological oil (claimed).    ADVANTAGE - The hydrogenation process enables to prepare biological oil in simple, cost-effective manner with improved stability and reduced oxygen content.    DETAILED DESCRIPTION - Hydrogenation process involves mixing of biomass (10 parts) with calcium formate (3-10 parts) in water (30-60 parts) with stirring to obtain a mixture. The mixture is heated at 40-60 degrees C for 0.5-2 hours, then dried in an oven at 80-110 degrees C for 16-24 hours to obtain a dried sample mixture. The dried mixed sample is dipped into liquid and cracking reaction is performed at 500-600 degrees C for 2-3 seconds to obtain a reaction product. The reaction product comprises bio-oil, non-condensing gas, solid pyrolysis carbon and calcium carbonate. Solid pyrolysis carbon and calcium carbonate are mixed at 30-45 degrees C and gasification is carried out at 600-900 degrees C for 10-20 seconds to obtain carbon monoxide and calcium oxide. Carbon monoxide, calcium oxide and water are mixed, then digestion reaction is carried out 30-50 degrees C for 4-8 minutes at stirring speed 300-500 revolutions per minute to obtain calcium hydroxide. Carbonylation reaction is carried out by mixing carbon monoxide with calcium hydroxide in volume ratio of 5:1 or 3:1 at stirring speed of 400-600 revolutions per minute at 4-6 megapascal pressure to obtain calcium formate. The carbonylation reaction is performed at 150-190 degrees C for 60-90 minutes. Thermal cracking liquefied reaction of calcium formate is carried out with additives to obtain the desired product.