Is Tail gas (petroleum), catalytic cracker, catalytic reformer and hydrodesulfurized combined fractionater vegan?

A complex combination of hydrocarbons produced as a gaseous petroleum refinery fraction from combined catalytic cracking, catalytic reforming and hydrodesulfurization processes; restricted when butadiene content exceeds 0.1% w/w due to its carcinogenicity concerns.

An ingredient is considered vegan if it contains no animal-derived components at any point in its production.

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