摘要:
The present invention provides an improved process for the synthesis of α-substituted acroleins from olefins by a tandem hydroformylation and Mannich reaction sequence in the presence of syngas and formaldehyde, wherein the two catalysts are segregated into two different phases thereby preventing deactivation of the catalysts by each other, and yielding a highly selective and active catalyst.
摘要:
Olefms may be produced by the non-reductive dehydroxylation of vicinal polyols and/or their respective esters, in a liquid reaction medium, under a substantially non- reductive atmosphere, in the presence of a halogen-based, preferably iodine-based, catalyst. The reaction medium may be aqueous, non- aqueous, or a combination thereof, and may in some embodiments include a solubility enhancing agent.
摘要:
Polyether polyols, derivatives and combinations thereof are converted to olefins under reductive or non-reductive dehydroxylation conditions, in the presence of a halogen-based catalyst. Derivatives include polyether polyols incorporated in polyurethanes. The process includes gas pressure from 1 psig (˜6.89 KPa) to 2000 psig (˜13.79 MPa), a temperature from 50° C. to 250° C., a liquid reaction medium, and a molar ratio of the starting material to halogen atoms from 1:10 to 100:1.
摘要:
The present invention describes an improved catalyst and process for the selective hydrogenation of nitro aromatics, nitrosoaromatics and aromatic hydroxylamines to their corresponding amines using gaseous hydrogen, in the presence of soluble iron compounds as a catalyst and optionally other reducible groups.
摘要:
A method of, and means for accomplishing the method, optimizing system resources in a network (102) using packetized voice telephony consists of the following steps: determining (302) that a packetized voice call from an originating gateway (104) terminates at a non-human voice interface system (108), wherein the packetized voice call is assigned a specified high priority level; and transmitting (304) signaling to cause the originating gateway (104) to transmit the packetized voice call to the non-human voice interface system (108) at a lower priority than the specified nigh priority level.
摘要:
A method of rebuilding a managed information tree includes steps of retrieving a unique key (304); testing to determine if a parent of the unique key exists (308); and if the parent exists, creating a node (318).
摘要:
Olefins are produced by the reductive dehydroxylation of vicinal polyols or esters thereof, or a combination thereof, in a liquid reaction medium, under a hydrogen atmosphere, at a temperature from 50° C. to 250° C., in the presence of a halogen-based, preferably iodine-based, catalyst. Examples of the catalyst, which may be included independently or generated in situ, are iodine (I2), hydroiodic acid (HI), iodic acid (HIO3), lithium iodide (LiI), and combinations thereof.
摘要:
The present invention provides an improved process for the production of tertiary amyl hydroperoxide by the liquid phase oxidation of isopentane in presence of air or molecular oxygen as oxidant using the oxides of Group IIA metals such as magnesium, calcium, strontium and barium in high pressure reactor under stirring conditions at a temperature ranging between 110°-180° C. and at moderate pressures for a period of 0.1-12 h. The catalyst reused for sevral times without affecting its catalytic performance. The present invention produces a tertiary amyl hydroperoxide with 40-60% selectivity and tertiary amyl alcohol, which has a numerius industrial applications.
摘要:
A palladium complex catalyzed process for the oxidation of linear alkanes is proposed which employs molecular oxygen as the oxidant to produce secondary alcohols and ketones in high selectivity, the said catalyst is a single entity and does not requires the use of any co-catalyst or solvent.
摘要:
The present invention provides a process for the production of a mixture of alcohols and ketones by the liquid phase oxidation of higher alkanes using a catalyst system consisting of transition group metal such as palladium and support such as alumina, silica, carbon, preferably carbon in the presence of alkyl hydroperoxide as oxygen carrier, under stirring conditions at a temperature range of 10°-120° C. and at atmospheric pressure in a stirred glass reactor for a period of 1-30 h. The present invention produces a mixture of alcohols and ketones with high selectivity (preferably 60-90%) along with other byproducts such as diketones and acids.