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If Contact process is used for manufacturing sulfuric acid, then where does the sulfuric acid used in the process itself come from?

The following is from wikipedia page for Contact Process :

Hot sulfur trioxide passes through the heat exchanger and is dissolved in concentrated $\ce{H2SO4}$ in the absorption tower to form oleum:

$\ce{H2SO4(l) + SO3(g) → H2S2O7(l)}$

Hence, where does this sulfuric acid come from?

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    $\begingroup$ Welcome to Chemistry.SE! Don't overdo the problem :) This is not a philosophical hen-or-egg dilemma. If you would have to build the plant, you would have to buy the a lot of parts from other suppliers, isn't it? Couldn't the same be true for the conc. sulfuric acid for the first runs? $\endgroup$ – Klaus-Dieter Warzecha Mar 8 '16 at 8:34
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    $\begingroup$ maybe this will help- chemistry.stackexchange.com/questions/34138/… $\endgroup$ – Nilay Ghosh Mar 8 '16 at 12:57
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There is no H2SO4 used in contact process it is just dissolving of SO3 in water under specific conditions and catalyst like V2O5 ie SO3+H2O=H2SO4 (g) (l) (aq)

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  • $\begingroup$ I thought $\ce{H2SO4}$ was used, because the reaction of $\ce{SO3}$ with $\ce{H2O}$ was too difficult to control. If that's not right it would be great if you could add some links and more details to your answer. $\endgroup$ – Curt F. Mar 9 '16 at 3:54
  • $\begingroup$ Welcome to Chemistry.SE! Take the tour to get familiar with this site. Mathematical expressions and equations can be formatted using $\LaTeX$ syntax. For more information in general have a look at the help center. I think you are confusing the Contact process with the wet sulfuric acid process. $\endgroup$ – Martin - マーチン Mar 9 '16 at 4:24
  • $\begingroup$ No, H2SO4 is used to adsorb the SO3 gas to form oleum. Then the oleum is diluted with water to form H2SO4 of desired concentration. $\endgroup$ – Nilay Ghosh Mar 9 '16 at 12:21

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