Methods are provided to use water-free quench liquids to obtain pyrolytic liquid products with reduced formaldehyde content. Products include liquids with improved hydroxyacetaldehyde content.

Provided is a biomass gasification and carbon capture coupled system to solve the problem that how to realize efficient utilization of the biomass energy, effective emission reduction of the carbon dioxide (CO.sub.2), and low-cost production of the alkaline compounds. The biomass gasification and carbon capture coupled system includes a fluidized bed device configured to gasify a biomass raw material, where an output end of the fluidized bed device is connected to a pressure swing adsorption (PSA) device; an output end of the PSA device is connected to an ammonia (NH.sub.3) production device; an output end of the NH.sub.3 production device is connected to a carbon capture device; the PSA device is further connected to a heat utilization device; and the heat utilization device is configured to provide heat energy for the NH.sub.3 production device.

A process for producing products from biomass comprises pyrolysing biomass at a selected temperature and producing a bio-syngas, processing bio-syngas from pyrolysis step (a) to remove condensable constituents from the bio-syngas, and processing the non-condensable bio-syngas from bio-syngas processing step (b) and producing one or more than one product, such as bio-fuels, bio-chemicals, bio-solvents and bio-plastics.