Abstract:
A process for preparing trinitrololuene (TNT) in which toluene is treated with nitric acid having a concentration of about 90% to about 99%, and preferably about 98% to about 99%, by weight at a temperature of less than about 60°C, and preferably less than 30°C, to produce high purity dinitrotoluene. The resulting dinitrotoluene is then treated with nitric acid having a concentration of about 98% to about 99% by weight and trifluoromethane sulfuric acid to produce high purity TNT.
Abstract:
A method for the regioselective ortho-directed nitration of phenolic compounds useful for the preparation of ortho-nitro-phenols according to formula (I) is described.
Abstract:
A tubular reactor (1) characterized by having short static mixing elements (1, 2, 3, 4, 5, 6, 7, 8, 9, 10) separated by coalescing zones (20, 21, 22, 23, 24, 25, 26, 27) is used to conduct multiphase liquid/liquid reactions. Small droplets of one of the phases are dispersed into the other phase by the static mixing elements (1, 2, 3, 4, 5, 6, 7, 8, 9, 10). These droplets coalesce and at least partially phase separate as the mixture passes through the subsequent coalescing zone. The tubular reactor is particularly suitable for nitrating organic compounds while forming low levels of improperly nitrated by-products and low levels of nitrophenolics.
Abstract:
A process for selectively eliminating a compound of general formula (II) from a mixture of a compound of general formula (I) with the compound of general formula (II). This process comprises reacting the compound of general formula (II) with a tertiary amine and a nucleophilic agent and then washing and/or crystallizing the thus obtained compound to thereby separate the same from the mixture. A process for producing a compound represented by general formula (I) which is free from any mutagen is also provided. In these formulae, R represents alkyl, alkyl carbonyl or alkoxycarbonyl; and Hal represents halogeno.
Abstract:
Disclosed is a process for the nitration of aromatic compounds using oxygen activated by an inorganic catalyst and nitrogen dioxide. Since the present invention does not use concentrated nitric acid nor concentrated sulfuric acid used in the conventional nitration reaction, the generation of spent waste acid does not occur. Further, the present invention does not encounter the problem of high costs associated with the generation of ozone as in an alternative nitration process. Mononitration as well as dinitration of aromatic compounds are possible by the improved reactivity of the present invention. According to a feature of the present invention, since the solubility of oxygen in a reaction medium is increased by using pressurized oxygen, nitrogen dioxide is activated by a porous catalyst and thus an aromatic compound is nitrated, the reaction rate is significantly increased and the recovery of reactants is easy due to the insolubility of the catalyst.
Abstract:
According to the invention, a quantity of 0.5 to 20,000 ppm of one or more surface active substances from the group of anionic, cationic, zwitterionic or non-ionic is added to the reaction mixture during the conversion of aromatic compounds with nitrating acid, said acid containing HNO3 and optional H2SO4 and/or H2O and/or H3PO4, to aromatic nitro compounds.
Abstract translation:包含在与硝化酸中,硝酸和任选的H 2 SO 4和/或H 2 O,和/或H 3 PO 4至芳族硝基化合物的芳族化合物的反应中,按照本发明为反应混合物的0.5至20000ppm的一种或多种表面活性剂组成的组的量 添加的阴离子,阳离子,两性离子或非离子的。
Abstract:
A method of reacting an aromatic compound with an immiscible reacting agent involves the passage of the reactant along a flow path having a width of from 10 to 1000 mu m in such a way that essentially laminar flow of the reactant takes place. Reaction takes place across the interface between the phases and without substantial mixing of the unreacted aromatic compound and the reacting agents. A preferred reaction is the nitration reaction which involves reaction of a first phase comprising an organic aromatic compound on a second phase comprising a nitrating agent to produce two new phases of different chemical composition to the starting phases. The aqueous and organic phases produced are ideally separated such that minimum contamination occurs. Other examples of this type of reaction include the sulphonation of an aromatic compound using sulphuric acid as the sulphonating agent. The aromatic compound is slowly consumed in the reaction yielding a single aqueous phase.
Abstract:
Preparation of 2,5-dichlorophenol by selectively oxidizing 1,4-dichlorobenzene using a peroxo-, hydroperoxo-, superoxo- or alkylperoxo-metal species in the presence of formic or an alkanoic acid.
Abstract:
The present invention provides a process for the nitration of aromatic substrates. In one process, an aromatic substrate is reacted with a silicate, optionally modified with a metal nitrate, in the presence of an acid anhydride and an organic solvent, followed by the addition of reduced amounts of nitric acid. Isolation of the nitrated products involves filtration, washing and solvent removal. This process can produce either mono- or polynitrated aromatic compounds depending upon the conditions selected and the aromatic substrate. The present invention also provides related processes for the nitration of strongly activated aromatic substrates using only silicates modified with metal nitrate in the presence of acid anhydrides and an organic solvent. All of these processes provide advantages in yield, cost, and safety over the industrial methods of nitration using mixed acids.