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Coffee Shop
Butane vs Propane
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<blockquote data-quote="Caustic Burno" data-source="post: 1667054" data-attributes="member: 694"><p>Yes some vaporized but it's partially miscible in the mix this changes the partial pressure and boiling point. Most blended was normal butane as the isomers like iso-propane, butane and pentane were Alkylated to gasoline.</p><p>Before all the EPA VOC regulations I remember blending in the winter up to 4% volume. When I retired if I remember correctly we were down to 2%. Gasoline is a blend of what we called Piano molecules that's paraffins, isomers,aromatics, naphthalene, and olefins in a range of C-4's to C-10's.</p><p>The molecular structure of each hydrocarbon changes its boiling temp. Hexane, benzene, 2-2-dimethyl butane</p><p>and vinyldiene are all C-6 hydrocarbons that act very different at the same temperature.</p><p></p><p>I know I went off in the weeds with the chemistry.</p><p>Think of the paraffin as like spaghetti molecules harder to get to moving and vaporizing.</p><p>The isomers would look more like jacks and would vaporize at a lower temperature and then your naphthalene and aromatics as they are shaped ball like.</p></blockquote><p></p>
[QUOTE="Caustic Burno, post: 1667054, member: 694"] Yes some vaporized but it’s partially miscible in the mix this changes the partial pressure and boiling point. Most blended was normal butane as the isomers like iso-propane, butane and pentane were Alkylated to gasoline. Before all the EPA VOC regulations I remember blending in the winter up to 4% volume. When I retired if I remember correctly we were down to 2%. Gasoline is a blend of what we called Piano molecules that’s paraffins, isomers,aromatics, naphthalene, and olefins in a range of C-4’s to C-10’s. The molecular structure of each hydrocarbon changes its boiling temp. Hexane, benzene, 2-2-dimethyl butane and vinyldiene are all C-6 hydrocarbons that act very different at the same temperature. I know I went off in the weeds with the chemistry. Think of the paraffin as like spaghetti molecules harder to get to moving and vaporizing. The isomers would look more like jacks and would vaporize at a lower temperature and then your naphthalene and aromatics as they are shaped ball like. [/QUOTE]
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