A Novel Demetalation Process for Vanadyl- and Nickelporphyrins from Petroleum Residue by Photochemical Reaction and Liquid−Liquid Extraction

2000 ◽  
Vol 39 (5) ◽  
pp. 1345-1355 ◽  
Author(s):  
Yasuhiro Shiraishi ◽  
Takayuki Hirai ◽  
Isao Komasawa
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