Abstract:
Methods for preparing molybdenum-based catalyst for epoxidation reactions using MPG sourced from a propylene oxide/styrene monomer (POSM) production process are described. Streams exiting from the POSM reactor are combined and separated to isolate an aqueous-based, MPG-containing purge stream from other recoverable byproducts of the POSM process. This MPG-containing purge stream is then used as is in the catalyst preparation of molybdenum-based catalyst for epoxidation. Alternatively, the MPG-containing purge stream can undergo additional purification treatments before being utilized in the catalyst preparation.
Abstract:
Process for the preparation of an epoxidation catalyst, which process comprises: (a) drying a silica gel carrier having a surface area in the range of from 330 to 450 m 2 /g at a temperature in the range of from 300 to 450 °C, and (b) contacting the carrier obtained in step (a) with a gas stream containing titanium halide to obtain an impregnated carrier, and the use of such catalyst in the preparation of alkylene oxide.
Abstract:
本发明公开了一种烯烃氧化方法,包括在烯烃氧化反应条件下,使反应进料依次流过第1至第n催化剂床层的步骤,其中设流过所述第1至第n催化剂床层的各反应物料的表观速度分别为v 1 至v n ,m取区间[2,n]内的任意整数时,关系式v m-1 <v m 成立。本发明的方法能够延长催化剂的使用寿命,特别是单程使用寿命,同时长期抑制副反应的发生。本发明还公开了一种烯烃氧化用固定床反应装置和系统。
Abstract:
A propylene oxide separation system that comprises a distillation column, a decanter, and water wash system. The distillation column is configured to receive a crude propylene oxide stream, discharge an impurity stream that comprises methanol and water, and discharge a bottoms stream that comprises a majority of the propylene oxide entering in the crude propylene oxide stream. The decanter is configured to receive at least a portion of the impurity stream and a hydrocarbon solvent to provide for formation in the decanter of an organic phase and an aqueous phase. The organic phase comprises propylene oxide and hydrocarbon solvent, and is sent to the distillation column. The aqueous phase comprises a majority weight percent of the methanol and the water entering in the impurity stream. The water wash system is configured to receive and purge the aqueous phase from the propylene oxide separation system.
Abstract:
The disclosure relates to a process for separating propylene oxide for a crude propylene oxide stream, for example an intermediate stream from a PO/TBA process. The crude propylene oxide stream can be passed through an extractive distillation column. The distillation column is operated at a pressure in a range of greater than 25 up to 50 psig, and/or at a temperature in a range of from 70 to 150 degrees Celsius using C 8 -C 20 paraffin as extractive solvent with an overhead distillate water wash drum. The crude propylene oxide stream include from 0.001 to 0.1 wt% methanol, based on the total composition of the crude propylene oxide stream. The systems, methods, and apparatuses can produce a propylene oxide stream having less formaldehyde and acetaldehyde than the prior art.
Abstract:
The present invention relates to a method of producing propylene oxide. A method of producing propylene oxide, comprising the following steps: a propane-dehydrogenation step (1), wherein propane is dehydrogenated to derive a section including propylene; an epoxidation step (1), wherein propylene and an organic hydroperoxide are reacted with each other in the presence of a catalyst (1) to derive propylene oxide and an alcohol wherein at least a part of said propylene is propylene derived in said propane-dehydrogenation step (1); a propylene recovery step (1), wherein unreacted propylene in said epoxidation step (1) is recovered wherein said propylene is recycled to said epoxidation step (1) as at least a part of raw materials in said epoxidation step (1); and a propylene-oxide purification step (1), wherein propylene oxide derived in said epoxidation step (1) is subjected to distillation to derive purified propylene oxide.
Abstract:
Epoxy resin compositions represented by the general formula (I) or (II), products of curing of the compositions, and a process for the preparation of the epoxy compounds through epoxidation with an organic percarboxylic acid: (I) (II) wherein R to R are each independently hydrogen, halogeno, a hydrocarbon group which may contain oxygen or halogen, or optionally substituted alkoxy.
Abstract translation:由通式(I)或(II)表示的环氧树脂组合物,组合物的固化产物和通过用有机过羧酸环氧化制备环氧化合物的方法:(I)(II) R 1至R 18各自独立地为氢,卤代,可以含有氧或卤素的烃基或任选取代的烷氧基。
Abstract:
A method of converting cumene hydroperoxide in a process for producing propylene oxide and cumyl alcohol by reacting cumene hydroperoxide with propylene, characterized by bringing unreacted cumene hydroperoxide into contact with a manganese-containing catalyst to thereby convert the unreacted cumene hydroperoxide into cumyl alcohol.