摘要:
This invention relates to a method of producing purified methyl isobutyl ketone (MIBK) comprising subjecting a feed stream containing MIBK and impurities to a first distillation procedure from which acetone is recovered. The bottom product of the first distillation procedure is fed to a liquid-liquid separator and an organic phase from the said liquid-liquid separator is fed to the top region of a second distillation column to produce an overhead product. The said overhead product is condensed and fed to the said liquid-liquid separator. A bottom product containing MIBK is withdrawn from the second distillation column. This bottom product is fed to a third distillation column, high boiling impurities are withdrawn as a bottom product, and purified MIBK is also withdrawn. The invention also relates to an apparatus used in such a method.
摘要:
Gegenstand der Erfindung sind Ausgangsverbindungen zur Herstellung von Polyurethanen, dadurch gekennzeichnet, dass sie durch Umsetzung von Hydroxylgruppen enthaltenden Oligomeren von Formaldehyd herstellbar sind.
摘要:
Verfahren zum destillativen Abtrennen von Formaldehyd aus Reaktionslösungen enthaltend ein methyloliertes Alkanal, das aus der Umsetzung von Formaldehyd mit einem Alkanal, das wenigstens ein acides Wasserstoffatom in a-Stellung zur Carbonylfunktion aufweist, oder aus der Umsetzung eines 2-Alkylacroleins oder Acrolein mit Wasser und Formaldehyd erhalten wird und diese Umsetzung in Gegenwart katalytischer Mengen eines organischen Amins durchgeführt wird, wobei die am Kopf einer destillativen Trenneinrichtung erhaltenen, leicht siedenden Verbindungen kondensiert und der in Wasser nicht lösliche Anteil des Kondensats abgetrennt wird.
摘要:
The invention relates to a method for the continuous production of glutaraldehyde by reacting an alkoxydihydropyrane of general formula (I), wherein R represents C1-C20 alkyl, with water at a temperature in the range of from 0 DEG C to 2000 DEG C and a pressure in the range of from 0.01 bar to 16 bar, and obtaining glutaraldehyde and the alcohol that corresponds to the alkoxy group. Water and alkoxyhydropyrane are continuously fed to a reaction column and at the top of the column a distillate enriched with the alcohol that corresponds to the alkoxy group and at the foot thereof a product enriched with glutaraldehyde is removed. The inventive method provides a simple means for producing glutaraldehyde or C-substituted glutaraldehydes continuously and with an improved purity which requires a minimum of equipment.
摘要:
The present invention relates to a method for separating a liquid crude aldehyde mixture by distillation. Said mixture contains unbranched and branched aldehydes. In a first distillation column, the product mixture is separated into a first product flow of branched aldehyde, a product flow of unbranched aldehyde and an additional product flow which contains unbranched aldehyde and the high-boiling components. In a second distillation column whose product flow is smaller by a factor of 50 to 200 than the product flow from the first distillation column, the additional product flow is then separated into a product flow of unbranched aldehyde and a high-boiling product flow.
摘要:
The invention relates to a method for separating a mixture containing butane-1,4-diol and at least one other compound from the following group: 4-hydroxybutyraldehyde, its cyclical hemiacetal and its cyclical whole acetals with at least one other alcohol, by distillation. The distillation is carried out in the presence of a compound which acts as an alkali. The mixture to be separated preferably contains a cyclical whole acetal of 4-hydroxybutyraldehyde with the other alcohol, this alcohol having a lower boiling temperature than butanediol and being in free form. The method is especially suitable for distilling and separating mixtures produced in the hydrogenation of maleic acid derivatives.
摘要:
A Friedel-Crafts acylation reaction is carried out in the presence of an ionic liquid system as catalyst. The ionic liquid system preferably also functions as a reaction solvent.
摘要:
The use of an organic polymer additive to minimize or prevent the rhodium of a rhodium-organophosphite complex catalyst from precipitating from solution during a liquid recycle hydroformylation process.
摘要:
Continuous process for hydroformylation of olefins containing, typically, from 6 to 20 carbon atoms to produce the corresponding aldehydes. The rate of formation of high boiling aldehyde condensation products is minimised by use of a high boiling inert solvent whose boiling point, at the pressure prevailing in the product recovery zone, lies intermediate between that of the highest boiling aldehyde product produced in the hydroformylation reaction and that of the ligand, as well as by maintaining the concentration of product aldehyde at or below a predetermined minor amount. In this way the length of a production run can be significantly extended before it becomes necessary to shut down the plant due to accumulation of high boiling aldehyde condensation products.