Hydrogen cyanide (prussic acid)

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Hydrogen (steam reforming natural gas)

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Hydrogen (steam cracker)

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Hydrogen (steam reforming heavy fuel oil)

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Hydrochloric acid (phosgenation) by-product toluene diamine (TDA),Toluene diisocyanate

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Hexane at refinery

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Hexamethylenediamine (HMDA; from butadiene via adiponitrile)

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Heptane at refinery

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Helium (liquid)

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Heavy fuel oil at refinery (1.0 wt.% S)

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