A process is described for producing an alkylaromatic compound by reacting an alkylatable aromatic compound with a feed comprising an alkene and an alkane in a multistage reaction system comprising at least first and second series-connected alkylation reaction zones each containing an alkylation catalyst. At least the first alkylation reaction zone is operated under conditions of temperature and pressure effective to cause alkylation of the aromatic compound with the alkene in the presence of th...

Parallel kinematics with rod guidance are nowadays used in machine tools, production machines and robotics. Changes in rod length caused by the special position of the moving work platform (P), by its acceleration and other force impact, can lead to positional errors. Such errors are eliminated by means of piezo-actuators (PA1-PA6) which are integrated into the rods (S1 to S6).

A process for the production of propylene from an olefinic feedstock containing at least one olefin of C.sub.4 or greater, the process comprising contacting the olefinic feedstock with a catalyst of the MFI-type having a silicon/aluminum atomic ratio of at least about 180 to produce an effluent containing propylene, the propylene yield on an olefin basis being from 30 to 50k based on the olefinic content of the feedstock.

A process for the production of olefins by catalytic cracking, the process comprising feeding a hydrocarbon feedstock containing at least one olefin of C.sub.4 or greater over a MFI-type crystalline silicate catalyst to produce an effluent containing at least one olefin of C.sub.2 or greater by catalytic cracking which is selective towards light olefins in the effluent, whereby for increasing the catalyst stability by limiting formation of coke thereon during the cracking process the catalyst ha...

A process for the disproportionation of cumene is disclosed which comprises the step of contacting a feed containing cumene, under disproportionation conditions, with a catalyst comprising a molecular sieve, preferably TEA-mordenite. The contacting step disproportionates at least part of the cumene in the feed to provide a disproportionation effluent containing benzene and a mixture of diisopropylbenzene isomers. The effluent is then recovered and contains, prior to any separation step, less 1% ...

A method for forming propylene wherein ethylene is employed as a primary feed material in a combination of steps comprising dehydration, skeletal isomerization, and metathesis to form a versatile product mix that can contain one or more of propylene, gasoline, MTBE, and propylene oxide.

The present invention relates to a process for the production of isoprenoids Coenzyme Q-10 by microorganisms. More particularly, the present invention relates to a process for increased production of Coenzyme Q-10 by microorganisms of the genus Rhodobacter, preferably of the species R. sphaeroides which have been transformed with one or more gene(s) of the mevalonate (mev) operon from a different microorganism, preferably of the genus Paracoccus, more preferably of the species P. zeaxanthinifaci...

A production line comprises production devices arranged in a line for machining a workpiece by conveyance of the workpiece successively to the production devices. Each of the production devices has a machine for machining the workpiece, an individual base for supporting the machine, a mounting unit that removably integrally mounts the machine on a surface of the individual base, and a positioning/moving unit that positions the machine on the surface of the individual base and that facilitates sl...

A process of producing polyethylene, the process comprising copolymerizing ethylene and an alpha-olefinic comonomer comprising from 3 to 8 carbon atoms in the presence of a chromium-based catalyst in a main polymerization reactor and, in a gas-phase preliminary reactor upstream of the main polymerization reactor, chemically treating the chromium-based catalyst with at least one treatment agent prior to introduction of the catalyst into the main polymerization reactor and releasing from the preli...

A known deepwater solution for production risers for extracting oil and gas is the SLOR.TM. riser. The design of the SLOR.TM. riser is not compatible with large numbers of risers and thus there is a need for a deep water riser that can be deployed in large numbers, for example 20 to 30 risers. The present invention discloses a support frame that can be used to receive a plurality of risers, which can then be connected to a surface vessel.