Editing Contact process (section)

==History==
This process was patented in 1831 by British vinegar merchant Peregrine Phillips.<ref>{{cite book| url =https://books.google.com/books?id=xriMAgAAQBAJ&pg=PA229|title = A History of Platinum and its Allied Metals|isbn = 9780905118833|last1 = McDonald|first1 = Donald|last2 = Hunt|first2 = Leslie B.|date = January 1982| publisher=Johnson Matthey Plc }}</ref><ref>{{cite patent|country = UK| number= 6093| status=| title= Manufacturing of Sulphuric Acid |pubdate= | gdate= 1831| fdate = | pridate = | invent1 =  Peregrine Phillips Junior| | class=| url= }}</ref><ref>{{cite book | url = https://books.google.com/books?id=6pvzCAAAQBAJ&pg=PA16|title = Catalysis: Science and Technology|isbn = 9783642932786|last1 = Anderson|first1 = John R.|last2 = Boudart|first2 = Michel|date = 2012-12-06| publisher=Springer }}</ref> In addition to being a far more economical process for producing concentrated [[sulfuric acid]] than the previous [[lead chamber process]], the contact process also produces [[sulfur trioxide]] and [[oleum]].

In 1890 [[John Brown Francis Herreshoff]] developed a form of the contact catalytic process for the company of which he was a partner.<ref name=cuny1>{{cite news |title=Historical Maps, Geospatial Methods, and Brooklyn’s Early Chemicals and Petroleum Industries |first1=Peter |last1=Spellane |first2=Anne |last2=Leonard |publisher=Brooklyn Waterfront Research Center, NYC College of Technology CUNY |date=17 October 2013 |url=https://s3.amazonaws.com/files.commons.gc.cuny.edu/wp-content/blogs.dir/643/files/2013/10/NEWTOWN-CREEK-BWRC-20131017.pdf }}</ref>

In 1901 [[Eugen de Haën]] patented the basic process involving combining [[sulfur dioxide]] and [[oxygen]] in the presence of [[vanadium oxide]]s, producing [[sulfur trioxide]] which was easily absorbed into water, producing [[sulfuric acid]].<ref>{{cite patent|country = US| number= 687834A| status=| title= Method of Making Sulfuric Anhydrid |pubdate= | gdate= 1901-12-03| fdate = 1914-10-9| pridate = | invent1 = Carl Johann Eugen de Haën| url= https://worldwide.espacenet.com/patent/search/family/025346274/publication/US1371004A }}</ref>  This process was improved remarkably by shrinking the particle size of the catalyst (e.g. ≤ 5000 microns), a process discovered by two chemists of [[BASF]] in 1914.<ref>{{cite patent|country = US| number= 1371004| status=| title= Oxidation of sulfur dioxid and catalyst therefor |pubdate= | gdate= 1921-05-8| fdate = 1914-10-9| pridate = | invent1 = Franz Slama| invent2 = Hans Wolf| assign1= General Chemical Company| class=| url= https://worldwide.espacenet.com/patent/search/family/025346274/publication/US1371004A }}</ref><ref>{{cite book | url = https://books.google.com/books?id=6pvzCAAAQBAJ&pg=PA16|title = Catalysis: Science and Technology|isbn = 9783642932786|last1 = Anderson|first1 = John R.|last2 = Boudart|first2 = Michel|date = 2012-12-06| publisher=Springer }}</ref><ref>{{cite book | url = https://books.google.com/books?id=Q6XFfg8IIuAC&pg=SA10-PA816|title = Industrial Chemistry|isbn = 9788187224990|year = 1991| publisher=Krishna Prakashan Media }}</ref><!--10.1007/978-3-642-93278-6_1 https://archive.org/details/in.ernet.dli.2015.4339/page/n3/mode/2up-->