Method for manufacturing supplies for olefin production

A two-stage pyrolysis process with controlled thermal decomposition and catalytic cracking enhances olefin yield from plastics, addressing yield limitations in existing methods and achieving efficient olefin production.

JP7884697B2Active Publication Date: 2026-07-03SUMITOMO CHEM CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
SUMITOMO CHEM CO LTD
Filing Date
2026-03-03
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing methods for producing olefins from plastics have limitations in yield efficiency, particularly in the conversion of waste plastics through pyrolysis and catalytic cracking processes.

Method used

A method involving a two-stage pyrolysis process with specific conditions for plastic composition and thermal decomposition parameters, including a first pyrolysis step at 435°C to 595°C and 0 to 100 kPaG, followed by a catalytic cracking step using MFI-type zeolite catalysts, to produce a pyrolysis gas with controlled hydrocarbon composition, which is then purified to enhance olefin yield.

Benefits of technology

The method significantly improves the yield of olefins by optimizing the hydrocarbon composition and conditions, resulting in an olefin-rich gas with enhanced efficiency and reduced environmental impact.

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Abstract

To improve the yield of olefins. [Solution] A method for producing an olefin-producing feedstock for the production of olefins by thermal decomposition includes a first thermal decomposition step (S12) in which a plastic is thermally decomposed to obtain a first product, wherein the hydrocarbons contained in the first product satisfy all of the following conditions (i) to (iv): (i) The sum of the content of alkanes and alkenes up to C3 is 5 ≤ ​​X ≤ 35 [wt%]. (ii) The weight-average molecular weight calculated from the normal alkanes of C1 to C3 and C10 to C35 is 95 ≤ Y ≤ 240. (iii) The ratio of the sum of the content of normal alkanes of C10 to C35 to the sum of the content of normal alkanes of C1 to C3 and C10 to C35 is 0.30 ≤ Z ≤ 0.93. (iv) The ratio of the content of alkanes of C1 to C3 to the content of normal alkanes of C35 is 5 ≤ ​​W ≤ 205.
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