Process for Preparing Syngas from a Liquid Feedstock

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This invention discloses a process for preparing synthesis gas (syngas) from liquid organic feedstocks (such as pyrolysis oils, waste oils, and crude residues) by partial oxidation with oxygen, optionally steam, and carbon dioxide as a carrier and/or reactant. The process features a two-feed system: one feed contains a mix of liquid organic compounds and gaseous CO2, and another contains O2 (with optional steam). After mixing and atomizing the feeds, partial oxidation is performed at high temperatures (1100–1500°C), producing a syngas mixture of H2 and CO. The process allows recycling of CO2 from the syngas product back into the feed, reducing oxygen and steam requirements and supporting circular, lower-emission operation.

Use CasesContent extracted from patent full text and abstract with AI.

• Recycling and valorization of plastic waste and biomass by converting derived pyrolysis oils into syngas.
• Production of syngas from refinery residues, waste oils, or other challenging liquid hydrocarbons.
• Integration into chemical or fuel production chains (e.g., Fischer-Tropsch synthesis, methanol production, or ammonia synthesis).
• Manufacturing of polymers, monomers, and specialty chemicals starting from recycled or renewable carbon sources.
• Reducing CO2 emissions in industrial syngas production by internal CO2 recycling.
• Feedstock flexibility for chemical parks seeking to use various liquid wastes or by-products as resources.

BenefitsContent extracted from patent full text and abstract with AI.

• Allows use of diverse and challenging liquid feedstocks (e.g., mixed plastic waste, used oils) for syngas production.
• Reduces operating costs and emissions by recycling internally generated CO2, decreasing external oxygen and steam demand.
• Supports circular economy goals: converts waste or low-value materials into valuable chemical building blocks.
• Enables custom-tailored syngas ratios (H2/CO) useful for downstream chemical synthesis.
• Scalable for large and continuous industrial operations with stable and efficient mass-flow balancing.
• Potentially lowers the environmental impact versus conventional, fossil-only syngas production routes.

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Patent Abstract

The present invention relates to a process for preparing syngas, the process comprising (i) preparing a first feed stream comprising a liquid phase and a gaseous phase, wherein the liquid phase comprises one or more organic compounds, and wherein the gaseous phase comprises CO2; (ii) preparing a second feed stream comprising O2 and optionally steam; (iii) mixing the first feed stream and the second feed stream; (iv) reacting the mixed feed stream obtained from (iii) in a reaction zone, obtaining a product stream comprising H2, CO, optionally CO2, and optionally H2O, wherein the one or more organic compounds comprise C, H, and optionally one or more of O, S, and N.