Abstract:
The present application describes a process for the removal of undesirable by-products, namely organic acids, nitrophenols, in particular dinitrophenol and/or trinitrophenol, in nitrated streams, namely in processes for the production of mononitrobenzene by benzene nitration. Namely, it describes a process for the removal of nitrophenolic impurities/compounds, namely dinitrophenol and/or trinitrophenol, in particular dinitrophenol and trinitrophenol or trinitrophenol, from a product stream comprising mononitrobenzene, with an alkaline washing procedure, in a continuous, counter-current mode, preferably in a multistage, in particular 1-2-3... n stages, mixing/decanter system, wherein the alkaline washing comprises the following steps: a mixing stage of a stream comprising a nitrated aromatic compound in the presence of nitrophenols, with a stream comprising an alkaline solution with an ammonia concentration up to 0.5 % (m/m); a liquid-liquid extraction of the resulting mixture, with recovery of the organic phase.
Abstract:
The present application describes a process for the removal of undesirable by-products, namely organic acids, nitrophenols, in particular dinitrophenol and/or trinitrophenol, in nitrated streams, namely in processes for the production of mononitrobenzene by benzene nitration. Namely, it describes a process for the removal of nitrophenolic impurities/compounds, namely dinitrophenol and/or trinitrophenol, in particular dinitrophenol and trinitrophenol or trinitrophenol, from a product stream comprising mononitrobenzene, with an alkaline washing procedure, in a continuous, counter-current mode, preferably in a multistage, in particular 1-2-3... n stages, mixing/decanter system, wherein the alkaline washing comprises the following steps: a mixing stage of a stream comprising a nitrated aromatic compound in the presence of nitrophenols, with a stream comprising an alkaline solution with an ammonia concentration up to 0.5 % (m/m); a liquid-liquid extraction of the resulting mixture, with recovery of the organic phase.
Abstract:
Die Erfindung betrifft ein Verfahren zur Herstellung von Nitrobenzol, bei dem man zunächst durch Nitrierung von Benzol Roh-Nitrobenzol herstellt, welches dann nacheinander in mindestens einer sog. sauren Wäsche, in mindestens eineralkalischen Wäsche und in mindestens einerneutralen Wäsche gewaschen wird, wobei man zwischen der letzten alkalischen Wäsche und der ersten neutralen Wäsche mindestens eine zusätzliche Wäsche mit einer wässrigen Lösung eines Kaliumsalzes zwischenschaltet.
Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zur Entfernung von Verunreinigungen aus bei der Nitrierung von nitrierbaren aromatischen Verbindungen nach Abtrennung der Nitrierendsäure anfallenden nitrierten Rohprodukten durch Behandlung mit einem Waschmedium sowie eine zur Durchführung dieses Verfahrens geeignete Anlage bzw. Vorrichtung. Weiterhin ist Gegenstand der Erfindung eine Produktionsanlage zur Nitrierung nitrierbarer aromatischer Verbindungen mit nachfolgender Aufreinigung der nitrierten Produkte.
Abstract:
A method and apparatus for removing non-aromatic impurities from non- nitrated aromatic reactant in a nitration production process, in which process an aromatic reactant is nitrated (100) to produce a nitrated aromatic product using a molar excess of the aromatic reactant, and non-nitrated aromatic reactant is recovered (102) from the produced nitrated aromatic product and is recycled (104) for use in the nitration production process. A portion of the removed excess non-nitrated aromatic reactant is diverted (106) and subjected to nitration (108). The nitrated stream may be further processed by separating out the spent acids (1 10) and the non-aromatic impurities (116). These streams may be sent (114, 118) to a suitable location in the nitration production train.
Abstract:
The invention relates to a continuous method for producing nitrobenzene by nitriding benzene by means of nitric acid or mixtures of nitric acid and sulfuric acid to form raw nitrobenzene, washing the raw nitrobenzene by means of at least one acidic, alkaline, and neutral wash, respectively, wherein a prepurified nitrobenzene is obtained, comprising at least light boilers, optionally medium boilers, and high boilers and salts in addition to nitrobenzene, wherein the prepurified nitrobenzene is further purified by separating light boilers in a distillation apparatus by evaporating the light boilers and separating nitrobenzene from the further purified nitrobenzene thus obtained in a distillation apparatus by partially evaporating nitrobenzene, wherein pure nitrobenzene is removed from the distillation apparatus in gaseous form and then condensed, and wherein the non-evaporated part of the further purified nitrobenzene is fed back into the wash at an arbitrary point.
Abstract:
The present invention provides a process for purifying a monoterpene or sesquiterpene having a purity greater than about 98.5% (w/w) The process comprises the steps of derivatizing the monoterpene (or sesquiterpene) to produce a monoterpene (or sesquiterpene) derivative, separating the monoterpene (or sesquiterpene) derivative, and releasing the monoterpene (or sesquiterpene) from the derivative Also encompassed by the scope of the present invention is a pharmaceutical composition comprising a monoterpene (or sesquiterpene) having a purity greater than about 98.5% (w/w) The purified monoterpene can be used to treat a disease such as cancer The present monoterpene (or sesquiterpene) may be administered alone, or may be co-administered with radiation or other therapeutic agents, such as chemotherapeutic agents.
Abstract translation:本发明提供纯化大于约98.5%(w / w)的单萜或倍半萜的方法。该方法包括使单萜(或倍半萜烯)衍生以产生单萜(或倍半萜烯)衍生物的步骤,将 单萜(或倍半萜烯)衍生物和从衍生物中释放单萜(或倍半萜烯)本发明的范围还包括药物组合物,其包含纯度大于约98.5%的单萜(或倍半萜烯)(w / w )纯化的单萜可用于治疗诸如癌症的疾病。目前的单萜(或倍半萜烯)可以单独施用,或者可以与辐射或其它治疗剂如化学治疗剂共同施用。
Abstract:
A method of removing alkalinity and salt from a nitroaromatic product downstream of water washing to remove mineral acids and alkaline washing to remove salts of organic acids, comprises washing the product stream with an acidic aqueous solution, prior to the step of removing excess organic reactant, by steam stripping or distillation. Acid removed from the stripper or column is recycled back for use in the acidic washing. The acidic washing is done instead of the neutral washing step of the prior art. It removes residual salt and decreases the level of entrained colloidal water in the nitroaromatic product.
Abstract:
The present invention relates to agglomerated zeolitic adsorbents based on X zeolite and LSX zeolite powders. These adsorbents are particularly well suited for the separation of C8 aromatic isomers and especially xylenes, for the separation of sugars, for the separation of polyhydric alcohols, for the separation of substituted-toluene isomers, such as nitrotoluene, diethyltoluene and toluenediamine, for the separation of cresols and for the separation of dichlorobenzenes.
Abstract:
In a reaction system having at least two liquid-liquid interfaces between an aqueous phase, which comprises an organic phase of a material containing the compound to be separated and an aqueous solution of a clathrate complexing agent, and an organic phase comprising an extraction solvent, the above compound is incorporated into the aqueous phase via the formation of a clathrate complex of the compound and the above clathrate complexing agent and, at the same time, the compound to be separated is incorporated into the organic phase of the extraction solvent via the dissociation of the above-described clathrate complex. The procedures as described above are carried out by using, for example, a square U-shape tube or an H-shape tube provided with a bottom plate. It is preferable to use, for example, highly water-soluble branched cyclodextrins as the clathrate complexing agent.