Abstract:
This invention relates to a new process for preparing 4-nitro-oxy-methyl- benzoic acid, comprising the following steps: a) reaction of 4-chloromethyl-benzoic acid with silver nitrate and in the presence of an acid as a catalyst in acetonitrile at reflux temperature, followed by cooling and adding of a polar aprotic solvent; b) separation of the silver salts by filtration, followed by washout with a polar aprotic solvent; c) precipitation of the 4-nitro-oxy-methyl-benzoic acid with water from the filtrate obtained in step b); and d) drying of the 4-nitro-oxy-methyl-benzoic acid.
Abstract:
A process for the continuous production of a compound of Formula (II), HO-R1-ONO2 (II) wherein R1 is a straight chain alkyl radical having from 3 to 6 carbon atoms, in a two-phase solvent system, comprising contacting a compound of Formula (I), HO-R1-OH (I) wherein R1 is as defined above, with nitric acid in the presence of a first solvent, wherein the compound of Formula (II) is continuously extracted into a second solvent, and the reaction is carried out in a mixing microreactor which provides a power loss of at least 1.3 times the power loss provided under identical conditions by a circular cross-section straight-channel microreactor having an internal diameter equal to the average hydraulic diameter of the mixing microreactor and a length equal to the length of the mixing microreactor.
Abstract:
Gegenstand der Erfindung ist ein Verfahren zur Herstellung von Salpetersäureestem (Nitroestern) von einwertigen Alkoholen, bei dem ein einwertiger Alkohol oder eine Mischung einwertiger Alkohole mit Salpetersäure in Gegenwart von Schwefelsäure unter adiabatischen Reaktionsbedingungen umgesetzt wird.
Abstract:
A process for preparing 1,2- and 1,3-dinitrate esters from polyols containing 1,2- or 1,3-diol fragments involves using an alkyl or aryl boronic acid to form a cyclic boronate ester derivative which is then reacted with dinitrogen pentoxide to directly generate the dinitrate ester. In the cyclic ester form the 1,2- or 1,3-hydroxyl groups are protected and other reactions may then be carried out on other parts of the molecule of which the fragment forms a part, leaving the dinitrate ester to be produced subsequently in the final step. High yields are obtained at both stages.
Abstract:
A process for the preparation of nitric monoesters of dihydroxyalkyl, dihydroxycycloalkyl or dihydroxy(poly)cycloalkyl compounds starting from the respective nitric diesters of dihydroxyalkyl, dihydroxycycloalkyl or dihydroxy(poly)cycloalkyl compounds, which comprises the hydrogenation of the nitric diesters with a platinum (0) catalyst.
Abstract:
A process for synthesizing isooctyl nitrate in a continuous flow reactor comprises flowing a H2SO4-HNO3 mixture within a flow reactor, flowing isooctyl alcohol into said flow reactor so as to mix the isooctyl alcohol with the H2SO4-HNO3 mixture and produce a reaction mixture stream flowing in said reactor, maintaining the reaction mixture stream flowing in said flow reactor at a reaction temperature within in the range −10° to 35° C. inclusive, and wherein the residence time of the reaction mixture stream in the flow reactor is greater than or equal to 5 seconds and less than or equal to 40 seconds, and wherein the H2SO4 of the H2SO4-HNO3 mixture is H2SO4 having a concentration of in the range of 85 to 95% inclusive, more desirably 88 to 92% inclusive, most desirably of 90%.
Abstract translation:在连续流动反应器中合成硝酸异辛酯的方法包括使流动反应器内的H 2 SO 4 -HNO 3混合物流动,将异辛醇流入所述流动反应器中,以将异辛醇与H 2 SO 4 -HNO 3混合物混合并产生流动的反应混合物流 在所述反应器中,将反应混合物流保持在所述流动反应器中的反应温度在-10℃至35℃的范围内,其中反应混合物流在流动反应器中的停留时间大于或等于 等于5秒且小于或等于40秒,并且其中H 2 SO 4 -HNO 3混合物的H 2 SO 4是浓度在85-95%(含)范围内的H 2 SO 4,更优选为88-92%,最优选为 90%。
Abstract:
Process for the production of a chemical compound from a carbon dioxide starting material, comprising the steps of a) providing a feed stream consisting mainly of carbon dioxide; b) electrolyzing in an electrolysis stage the carbon dioxide in the feed stream to a first gas stream containing carbon monoxide and a second gas stream containing oxygen, wherein the molar ratio between carbon monoxide and oxygen is about 1:0.5 in an electrolysis stage; c) adjusting the composition of the first gas stream or the second gas stream or both gas streams to include carbon dioxide, either by operating at less than full conversion of CO2 or by sweeping one or both gas streams with a gas containing CO2 or by at some stage between the electrolysis cell and the oxidative carbonylation reactor diluting one or both gas streams with a gas containing CO2; all while maintaining an overall molar ratio of carbon monoxide to oxygen of about 1:0.5; and d) introducing the first and second process stream into a reaction stage and reacting the first and second process stream combined or in succession with a substrate to the chemical compound by means of an oxidative carbonylation reaction with the carbon monoxide and oxygen contained in the process feed stream.
Abstract:
A method is presented for production of a cetane-index improvement additive for diesel oil produced from biodiesel from castor bean oil. Said method employs nitration at the site of the hydroxyl functionality already forming part of the natural molecular chemical structure of the fatty acid ester generated in the production of biodiesel obtained from castor bean oil. The present method is advantageous through having a lower number of processing stages, lower rate of undesired nitration of unsaturations, lower consumption of nitrating mixture, reduction in the level of attachment of NO 2 to the molecules of the additive and consequent reduction in undesirable environmental impacts caused by NO x , and utilising a raw material from a renewable source. The present cetane improvement additive may be employed as an additive to diesel oil of mineral origin, biodiesel, or synergetic mixtures thereof in any proportion.