Methods and systems for preparing gaseous feedstocks

By preheating and separating hydrocarbon blends in the convection zone of the cracker, the scaling problem caused by the high boiling point of the circulating feedstock oil is solved, achieving efficient utilization of the circulating feedstock oil and low-emission plastic recycling.

CN122095052APending Publication Date: 2026-05-26DOW GLOBAL TECHNOLOGIES LLC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DOW GLOBAL TECHNOLOGIES LLC
Filing Date
2024-10-03
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

In the existing steam cracking industry, when using recycled feedstock oil as raw material, there is a scaling problem caused by high boiling point. At the same time, the distillation and separation of lighter fractions increases greenhouse gas emissions and reduces the plastic recycling yield.

Method used

By preheating the hydrocarbon blend in the convection section of the cracker and mixing it with dilution steam, a separator is used to separate it into liquid and gaseous feedstocks. This ensures that the high-boiling-point circulating feedstock oil is completely evaporated in the cracker, avoids scaling, and reduces energy consumption in the distillation process.

Benefits of technology

This achieves efficient utilization of recycled feedstock oil, reduces the risk of scaling, decreases greenhouse gas emissions, and increases the yield of plastic recycling.

✦ Generated by Eureka AI based on patent content.

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Abstract

Embodiments of this disclosure relate to a method and system for preparing a gaseous feedstock. The method and system for preparing a gaseous feedstock for a reactor section of a cracker includes: preheating a hydrocarbon blend in a feed preheating exchanger (FPH) located in a convection section of the cracker to form a preheated hydrocarbon blend, the cracker having a convection section connected to the reactor section, wherein the hydrocarbon blend comprises fossil-based hydrocarbon feedstock and recycled feedstock oil. The method and system further include mixing the preheated hydrocarbon blend with dilution steam to form a hydrocarbon-water gas-liquid feed mixture, separating the hydrocarbon-water gas-liquid feed mixture into liquid and gaseous feedstocks, and supplying the gaseous feedstock to a high-temperature coil exchanger (HTC) of the cracker.
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