contact process

noun Chemistry.
a catalytic method for producing sulfuric acid from sulfur dioxide and oxygen.

1900–05 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica

contact process

modern industrial method of producing sulfuric acid; it has largely replaced the chamber, or lead-chamber, process. Sulfur dioxide and oxygen, passed over a hot catalyst, unite to form sulfur trioxide, which in turn combines with water to make sulfuric acid.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
There are two major processes that have been used to produce sulfuric acid, the
  chamber process and the contact process.
All family emergencies must go through the facility emergency contact process
  at your offender's location.
It is a biological contact process in which bacteria is commonly found.
Senior leaders are a key part of our integrated customer contact process that
  has been developed with our key customers.
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