Abstract:
The present invention provides a pretreatment method to reduce saturated fatty acids of fatty acids used as feedstock when preparing ester polyols. The range of feedstock includes non-fractionated to fully fractionated feedstock. Performing some fractionation by distillation of the fatty acids derived from feedstock eliminates the need to fractionate the various ozone esters from each other before esterification. Further, the approach of the present invention is more economical and efficient than the conventional method of fractionation by crystallization.
Abstract:
A novel odorant of formula (I) wherein each of Rl, R2, R3, R4, R5, R6, R7, R8, R9 and R10 are independently selected from H, CH3, and C2H5; X is selected from -CH20H, -CH20COCH3 and -CHO. n is selected form 0 and 1. The dotted line represents double bond or single bond.
Abstract:
The invention belongs to the field of organic chemistry and relates to a new synthesis of acetoxyacetaldehyde. Comprising the steps of providing monoacetyl ethylene glycol and converting it by oxidation using an N-oxyl compound in the presence of a co-oxidant.
Abstract:
This invention provides an integrated multistep economical process for the production of vinyl acetate monomer (VAM) from acetic acid in the vapor phase. First, acetic acid is selectively hydrogenated over a hydrogenating catalyst composition to form acetaldehyde. Acetaldehyde so formed can be converted to ethylidene diacetate via reaction with acetic anhydride. In a subsequent step so formed ethylidene diacetate is thermally decomposed to form VAM and acetic acid. Alternatively, acetaldehyde formed in the first step can selectively be reacted with ketene to form VAM. In an embodiment of this invention reaction of acetic acid and hydrogen over platinum and iron supported on silica selectively produces acetaldehyde in a vapor phase at a temperature of about 300°C, which is selectively hydrogenated over platinum supported catalyst to form ethanol and dehydrated over NAFION catalyst to form ethylene at a temperature of about 185°C, which is mixed with molecular oxygen, acetic acid and reacted over a palladium/gold/potassium catalyst supported on titania to form VAM at a temperature of about 150°C to 17O°C.
Abstract:
A reactor comprising at least one contact surface made from, coated with, or impregnated by a catalyst, wherein the contact surface comprises a sintered metal or a ceramic, and wherein the reactor is configured to subject a reactant stream to shear. A system for carrying out a heterogeneously catalyzed reaction, the system comprising a reactor as described above and a pump configured for delivering reactants to the at least one reactor. A method for carrying out a heterogeneously-catalyzed reaction by introducing reactants into a reactor comprising at least one contact surface made from, coated with, or impregnated by a catalyst under conditions which promote production of a desired product, wherein the contact surface comprises a sintered metal or a ceramic, and forming a dispersion of reactants within the reactor, wherein the dispersion comprises droplets or gas bubbles of reactant with an average diameter of less than about 5um.
Abstract:
Beschrieben wird ein Verfahren zur Herstellung von 2-Hydroxyacetalen der allgemeinen Formel (Ia), in der R 1 Wasserstoff, ein verzweigter oder unverzweigter C 1 -C 12 -Alkylrest, ein elektronenarmer, mit Halogen, einer NO 2 -, -CN, -CF 3 , Acylgruppe oder einer verzweigten oder unverzweigten Alkylgruppe substituierter oder unsubstituierter C 5 -C 6 -Aryl oder Heteroarylrest ist und R 2 ein verzweigter oder unverzweigter C 1 -C 5 -Alkylrest ist oder beide R 2 -Reste direkt miteinander oder über eine C 1 -C 4 -Einheit miteinander verknüpft sind, durch Umsetzung einer Enolverbindung der allgemeinen Formel (II), in der R 3 gleich Formel (A) ist und R 1 die für Formel (Ia) angegebene Bedeutung hat, mit Brom zum entsprechenden Dibromaddukt und anschließender Umsetzung dieses Dibromadduktes mit einem Alkoholat der allgemeinen Formel (III) M-O-R 2 , in der R 2 die für Formel (Ia) angegebene Bedeutung hat und O für Sauerstoff und M für Lithium, Natrium oder Kalium steht. Ebenfalls beschrieben wird die Herstellung der korrespondierenden 2-Hydroxyalkanale aus den so erhaltenen 2-Hydroxyacetalen durch saure Hydrolyse.
Abstract:
A process for producing esters wherein a carboxylic acid is reacted with an alcohol in the presence of a hydrolyzable catalyst in an aqueous medium under mixing to produce a reaction mixture comprising an organic phase containing ester and an aqueous phase.
Abstract:
A perfume composition characterized by containing at least one ester compound represented by the following formula (4). In the formula (4), R represents hydrogen, C1-8 alkyl, C5-8 cycloalkyl, etc.; R to R each represents hydrogen, C1-8 alkyl, etc.; R represents C1-5 alkyl, etc.; and A represents a single bond or an optionally substituted methylene group. The ester compound is a novel compound which emits a musk-like aroma.
Abstract translation:一种香料组合物,其特征在于含有至少一种由下式(4)表示的酯化合物。 在式(4)中,R 1表示氢,C 1-8烷基,C 5-8环烷基等; R 2至R 8各自表示氢,C 1-8烷基等; R 9表示C 1-5烷基等。 A表示单键或任选取代的亚甲基。 酯化合物是发出麝香样香气的新型化合物。