The disclosure provides a flushing process for removing polymer fouling from a reactor including a gas distributor proximal to the bottom thereof and an internal condenser proximal to the top thereof, the method including, for a first flushing time period, injecting a flushing solvent into the reactor and withdrawing the flushing solvent from a reactor outlet proximal to the internal condenser to induce an upward movement of flushing solvent, the withdrawn flushing solvent containing a first polymer content. After the first flushing time period is complete, for a second flushing time period, the process includes injecting a flushing solvent into the reactor and withdrawing the flushing solvent from a reactor outlet proximal to the gas distributor to induce a downward movement of flushing solvent, the withdrawn flushing solvent containing a second polymer content.

The presently disclosed subject matter relates to systems and methods for catalyst regeneration. In particular, the presently disclosed subject matter provides for an integrated fluidized bed reactor and catalyst regeneration system to minimize hydrocarbon accumulation. In one embodiment, the presently disclosed subject matter provides for a fluidized bed reactor unit including a catalyst riser having a partially perforated surface in close proximity to a reactor stripper.

The present invention relates to a device, using electrical resistance measurements, and a method to detect the undesirable carbon formation due to chemical processing of mixture of higher hydrocarbons subjected to high temperatures in process equipment such as methane steam reformers, heat exchangers, pipes.

A reactor for catalytic conversion of gas mixtures may include a catalyst bed. An upper side of the catalyst bed may include a gas lock that is movable in a vertical direction. The gas lock may be lowered when the catalyst bed contracts. In some examples, the gas lock prevents a gas mixture from flowing out of the catalyst bed via the upper side of the catalyst bed.

An apparatus for the gas-phase polymerization of olefins including a reactor having a polymerization zone, a recycle line for withdrawing reaction gas from the reactor and feeding the reaction gas back into the reactor, a compressor for conveying the reaction gas along the recycle line, and a heat exchanger for cooling the reaction gas, wherein at least part of the internal surface of the recycle line, which comes in contact with the reaction gas, has a surface roughness Ra of less than 5 m.

The disclosure provides a flushing process for removing polymer fouling from a reactor including a gas distributor proximal to the bottom thereof and an internal condenser proximal to the top thereof, the method including, for a first flushing time period, injecting a flushing solvent into the reactor and withdrawing the flushing solvent from a reactor outlet proximal to the internal condenser to induce an upward movement of flushing solvent, the withdrawn flushing solvent containing a first polymer content. After the first flushing time period is complete, for a second flushing time period, the process includes injecting a flushing solvent into the reactor and withdrawing the flushing solvent from a reactor outlet proximal to the gas distributor to induce a downward movement of flushing solvent, the withdrawn flushing solvent containing a second polymer content.

Methods for detecting incipient sheeting in a polyolefin gas phase reactor. The method can include flowing one or more monomer gases through a first tubular protruding through a reactor wall, flowing one or more monomer gases through a second tubular protruding through the reactor wall, wherein the first tubular is located within the second tubular, and measuring a pressure differential of the monomer gases flowing through the first and second tubulars. Based on the measured pressure differential, incipient sheeting within the reactor can be detected and one or more redial measures can be employed to control or reverse the sheeting.

A chemical reactor system comprising: a) a main reactor comprising: i) a reaction chamber containing catalyst, ii) an inlet for feeding feedstock gas from a feedstock source into the reaction chamber to contact the catalyst, and iii) an output for reaction products produced in the reaction chamber from reaction of the feedstock gas in the presence of the catalyst; and b) a reaction testing module comprising: i) an inlet configured to receive feedstock gas from the same feedstock source supplying feedstock gas to the main reactor, and ii) at least one test reactor in fluid communication with the inlet and each comprising a reaction chamber containing catalyst, wherein the main reactor is a Fischer Tropsch reactor containing a Fischer Tropsch catalyst.

Methods described herein are directed to decreasing triboelectric charging of, and/or reactor fouling by, polyolefin particles, the methods comprising: feeding an argon gas/nitrogen gas mixture upward through the distributor plate into the reaction zone to fluidize the polyolefin particles in the reaction zone, wherein the argon gas/nitrogen gas mixture consists of from 5 volume percent (vol %) to no more than 65 vol % argon gas, from 95 vol % to no less than 10 vol % nitrogen gas, and from 0 vol % to no more than 5 vol % helium gas, wherein the sum of all these vol % equals 100 vol % of the argon gas/nitrogen gas mixture.