摘要:
The present specification relates to an olefin oligomerization method and specifically to an olefin oligomerization method comprising the step of subjecting an olefin to a multimerization reaction by controlling a reaction temperature such that the weight ratio of 1-hexene to 1-octene within a product comprising 1-hexene and 1-octene has a predetermined value, in the presence of an oligomerization catalyst system comprising a ligand compound, a transition metal compound, and a cocatalyst, wherein the predetermined value for the weight ratio of 1-hexene to 1-octene within the product is selected in a range of 1:0.5 to 1:7. By the method, 1-hexene and 1-octene can be produced in a desired ratio.
摘要:
The present invention relates to a method for reaction control of an exothermic reaction, comprising the steps: i) carrying out an exothermic reaction in a reactor containing a reaction medium comprising educt, catalyst, and optionally solvent and/or product, ii) measuring temperature and/or pressure in and/or at the reactor by means of sensor(s), iii) introducing an oxidizing catalyst poison into the reactor, if temperature and/or pressure measured exceed(s) predetermined value(s); as well as to an apparatus for carrying out an exothermic reaction.
摘要:
The present invention relates to a method, comprising: providing a microfluidic system comprising one or more channels (25,28,29); providing within said one or more channels (25,28,29) a first fluidic stream and a second fluidic stream, at least one of which comprises droplets that have an average diameter of less than about 450 microns and that are highly monodisperse; and applying an electric field (40) simultaneously to at least a portion of the first fluidic stream and a portion of the second fluidic stream such that said portions coalesce.
摘要:
The present technique provides for the use of spectroscopic probes, such as Raman probes, within the conduits of a polyolefin production system. The Raman probe or other spectroscopic probes can be used to obtain spectroscopic measurements of the contents of the conduits. The spectroscopic measurements can be processed and analyzed to determine the composition of the conduit contents. In addition, the spectroscopic measurements can be used in conjunction with correlations or other statistical models to determine one or more properties of interest of a constituent of the conduit contents. One or more processes upstream and/or downstream of the conduit can be adjusted in response to the determined composition or composition properties.
摘要:
The invention relates to a method for the direct cooling of reaction media. Said method is characterised in that a suitable liquid gas, which acts as a coolant, is introduced below the surface of the reaction mixture.
摘要:
The present invention is a process for transitioning from a first polymerization catalyst system to a second polymerization catalyst system incompatible with the first polymerization catalyst system in a gas-phase reactor. The novel process comprises conducting a first polymerization reaction using a first polymerization catalyst system; stopping the first polymerization reaction; removing the contents of the first polymerization reaction from the reactor while maintaining a substantially closed system; then, in the substantially closed system, introducing a substantially contaminant free seedbed into the reactor; introducing a second feed system and a second catalyst system into the reactor; and conducting a second polymerization reaction.
摘要:
The non-routine (e.g., emergency) shutdown of a chemical reaction process is achieved by a method of safely operating a chemical reaction process which comprises the steps of detecting an undesirable condition capable of affecting the process, minimizing the reaction of the reactants, and maintaining a flow of materials through the reaction zones of the process such that the reaction mixture is displaced from the reaction zones. The flow of materials may be maintained for a period of time such that the substantially all of the reaction mixture is displaced from the reaction zones, thereby flushing the reaction zones. The reaction mixture may then be purged to an ancillary vessel, such as an absorber.
摘要:
Continuous gas-phase polymerization process for preparing ethylene and propene homopolymers and copolymers, in which ethylene, propene or mixtures comprising ethylene or propene and C3-C8-α-monoolefins are polymerized in the polymerization zone of a gas phase polymerization reactor at from 30 to 125 °C and pressures of from 1 to 100 bar in the gas phase in a bed comprising finely divided polymer in the presence of a catalyst. To remove the heat of polymerization, the reactor gas is circulated and firstly passes through a cyclone after leaving the reactor. To prevent polymer deposits in the circulating gas system, a catalyst poison having a boiling point above the maximum temperature within the circulating gas system is fed into this circulating gas system at a position between the reactor and the cyclone.