Process for the nitration of haloaromatics
AssigneeMonsanto Company
InventorIgnatius Schumacher
Life of this patent
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Abstract
It was found that the process for the nitration of halogenated aromatic compounds is improved by carrying out the nitration in the presence of a phosphorus compound in an amount sufficient to produce an ortho-directive effect. The addition of polyvalent metal elements such as vanadium, molybdenum, tungsten, and other elements that have the capability of existing in a variety of oxidation states, to a mixture of phosphoric and nitric acid improves the yield of the nitrohaloaromatics without affecting the isomer ratio.
Claims9
In a process for the preparation of a nitro- and halo- substituted aromatic compound, wherein a halogenated aromatic compound is contacted with a nitrating agent, the improvement which comprises carrying out the nitration in the presence of a phosphorus compound and a polyvalent metal element.
Dependencies are inferred from the claim text.