Abstract:
The present invention generally relates to an improved process for preparation of 5- Amino-2,4-di- tert -butylphenol or hydroxyl derivative thereof or an acid addition salt thereof, which is an intermediate of Ivacaftor. More specifically the present invention relates to a process for preparation of hydrochloric acid salt of 5-Arnino-2,4-di- tert - butylphenol.
Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zur kontinuierlichen Herstellung von Nitrobenzol durch Nitrierung von Benzol mit einem Gemisch aus Salpetersäure und Schwefelsäure unter adiabaten Bedingungen, bei dem während eines Produktions Stillstandes nicht die ganze Produktionsanlage abgefahren wird, sondern die Produktionsanlage ganz oder zumindest teilweise „im Kreis" gefahren wird. Des Weiteren betrifft die vorliegende Erfindung eine Anlage zur Herstellung von Nitrobenzol und ein Verfahren zum Betrieb einer Anlage zur Herstellung von Nitrobenzol.
Abstract:
A process for the preparation of dintrotoluene which comprises (a) nitrating toluene with a nitrating acid, wherein said nitrating acid is a mixture of nitric acid and sulfuric acid, in one or more nitration steps, and separating the nitrating acid from the process stream thus formed, wherein a crude mixture comprising dinitrotoluene and a fraction of said nitrating acid dissolved therein is obtained, said crude mixture further comprising at least 50 ppm of HCN, and (b) washing the crude dinitrotoluene containing mixture in one or more washing steps, wherein, before the first washing step is carried out, the crude mixture is distilled and/or stripped to remove HCN there-from, wherein a crude dinitrotoluene containing mixture which is essentially free of HCN is obtained.
Abstract:
The present invention discloses an improved process for the liquid phase nitration of aromatic compounds catalyzed by WO3 supported on mesoporous silica support, at low temperature, with high conversion and selectivity.
Abstract:
The present disclosure relates to compounds of Formula (I) and process of obtaining the same. Said compounds of Formula (I) is employed in the syntheses of pyrroloquinoline quinone (PQQ), 4,5-dioxo-4,5-dihydro-1H-pyrrolo[2,3-f]quinoline-2,7,9-tricarboxylic acid 2-allyl ester, 5-ethoxy-5-hydroxy-4-oxo-4,5-dihydro-1H-pyrrolo[2,3-f]quinoline-2,7,9-tricarboxylic acid, 5- hydroxy-6-(1,1,4-trioxo-1 lambda* 6*-1,2, 5 -thiadiazolidin-2-yl)-1H-indole-2-carboxylic acid and its pharmaceutically acceptable salts. Said syntheses of compounds via. compounds of Formula (I) as intermediates employ minimum number of steps resulting in a shorter process and has improved efficiency along with many other advantages.
Abstract:
The present invention relates to a method for preparing nitroparaffin in high yield by reacting a hydrocarbon compound with a gas phase nitration agent using a specific solid acid catalyst, a solid base catalyst or a mixture thereof as a catalyst, wherein the method can: obtain a sufficiently high yield of nitroparaffin although the gas phase nitration is carried out in normal pressure conditions; and carry out the reaction through a continuous process as well as a batch-type process, such that the method is very useful as an industrial production method.
Abstract:
Disclosed herein is a continuous tubular reactor based conversion of acetophenones to amino substituted acetophenones wherein the nitration is carried out at -10 to 10 °C followed by reduction to m-nitrophenone resulting in uniform output of product, said process comprising the steps of: a) Nitrating acetophenone with nitrating agent (nitration mixture or fuming nitric acid) at -10 to 10 °C; b) Isolating m-nitro acetophenone from a mixture of o and m-nitro acetophenone and c) Reducing the m-nitro to obtain m-amino acetophenone.
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:
본 발명은 특정의 고체 산촉매, 고체 염기촉매 또는 이들의 혼합물을 촉매로 사용하여 탄화수소 화합물을 기체상 니트로화제와 반응시켜서 니트로파라핀을 높은 수율로 제조하는 방법에 관한 것으로, 상압 조건으로 기체상 니트로화 반응을 수행하더라도 충분히 높은 수율로 니트로파라핀을 얻을 수 있으며, 배치식 공정은 물론이고 연속식 공정으로 반응을 진행시킬 수 있으므로 공업적인 생산방법으로서 이용 가치가 높다.
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.