Installation for gas-phase polymerisation

Abstract

Installation for the gas-phase polymerisation of at least one olefinic monomer, comprising a horizontal stirred reactor consisting of an undivided space, provided with a number of gas feeds ( 13 a - 13 ) in the bottom section of the reactor ( 1 ) and a number of liquid feeds ( 7 a - 7 ) in the top section of the reactor ( 1 ) and at least two gas outlets ( 9, 11 ) at the top of the reactor ( 1 ), the installation being provided with means ( 43, 45 ) to regulate the discharge capacities of the gas outlets.

1 . Installation for the gas-phase polymerisation of at least one olefinic monomer, comprising at least one horizontal stirred reactor, provided with a number of gas feeds in the bottom section of the reactor and a number of liquid feeds in the top section of the reactor and at least two gas outlets at the top of the reactor, 
 wherein the reactor is undivided and is provided with means to regulate the discharge capacities of the gas outlets.    
     
     
         2 . Installation according to  claim 1 , wherein each gas outlet is connected to its own recovery unit for the gases removed through that gas outlet.  
     
     
         3 . Installation according to anyone of claims  1 - 2 , which is additionally provided with means to determine the composition of the gases removed through the gas outlets.  
     
     
         4 . Installation according to anyone of claims  1 - 2 , which is provided with means to determine, at a number of points, the composition of gases that are present in the top of the reactor.  
     
     
         5 . Installation according to anyone of claims  3 - 4 , wherein the means that determine the composition of the gases actuate the means to regulate the discharge capacities of the gas outlets.  
     
     
         6 . Process for the gas-phase polymerisation of at least one olefinic monomer in an installation which comprises at least one horizontal stirred reactor consisting of an undivided space, which is provided in the bottom with a number of gas feeds and in the top with a number of liquid feeds, the gas feeds and the liquid feeds being divided into corresponding separate groups, and which is provided in the top with at least two gas outlets for removing gases from the reactor which are each connected to their own recovery unit, said process comprising: 
 feeding a catalyst system to the reactor,    feeding different gas composition comprising the at least one olefinic monomer to a selected group of gas feeds and accordingly adjusted liquid compositions to the corresponding liquid feeds,    removing the reacted gaseous components through the gas outlets, with the ratio of the discharge capacities of the gas outlets being adjusted so that the gases coming from a group of gas feeds and a corresponding group of liquid feeds are mainly removed through one corresponding gas outlet,    removing the obtained polymer from the reactor.    
     
     
         7 . Process according to  claim 6 , wherein the ratio between the discharge capacities of the gas outlets is adjusted so that components that are fed to a first group and which can be harmful to the polymerisation within another group are removed in at most a non-harmful quantity.  
     
     
         8 . Process according to anyone of claims  6 - 7 , wherein two adjacent groups of gas feeds and/or liquid feeds are separated by one or more gas feeds or liquid feeds, respectively, to which a gas composition or a liquid composition, respectively, is fed in which the harmful components are absent.