Ever checked my page?
Aromatic Nitration with KNO3/H2SO4 in Dichloromethane
Tetrahedron Letters, Vol 42(7), 1387-1389 (2001) (https://www.thevespiary.org/rhodium/Rhodium/chemistry/aromatic.nitration.html)
(https://www.thevespiary.org/rhodium/Rhodium/chemistry/aromatic.nitration.html)
Abstract
Pure dry HNO3 can be liberated from KNO3 with 96% H2SO4 directly into CH2Cl2 to yield solutions of variable concentration for use in a number of organic reactions. The present method efficiently replaces the employment of 100% HNO3 in some synthetic applications, avoiding the problems associated in storage and handling the acid.
Nitration Of Phenols Under Mild And Heterogeneous Conditions
Molecules 2001, 6, 614-620 (https://www.thevespiary.org/rhodium/Rhodium/pdf/phenol.nitration.pdf)
(https://www.thevespiary.org/rhodium/Rhodium/pdf/phenol.nitration.pdf)
Abstract
Nitrophenols can be obtained in moderate to high yields using a combination of Mg(HSO4)2 or NaHSO4.H2O, NaNO3 and wet SiO2 in dichloromethane at room temperature.
Thanks Rhod..
I found the original patent: Patent US3981975 (http://l2.espacenet.com/dips/viewer?PN=US3981975&CY=gb&LG=en&DB=EPD)
Says in a 53ml HNO3/47ml HSO4 lot..3x100ml DCM extractions will extract 59.3% HNO3 (or 31.2 grams).
Nitration of Aromatic Compounds on Silica Sulfuric Acid
Mohammad Ali Zolfigol, BiBi Fatemeh Mirjalili, Abdolhamid Bamoniri, Mohammad Ali Karimi Zarchi, Amin Zarei, Leila Khazdooz, and Jalil Noei
Bull. Korean Chem. Soc. 2004, 25 (9), 1414-1416
(https://www.thevespiary.org/rhodium/Rhodium/hive/hiveboard/picproxie_imgs/pdf.gif)
Preparation of silica sulfuric acid can be found in Post 475011 (https://www.thevespiary.org/talk/index.php?topic=7374.msg47501100#msg47501100)
(demorol: "Silica sulfuric acid/KBrO3 Oxidation of Alcohols", Chemistry Discourse)