Semi continuous process for the synthesis of a catalyst for use in the manufacture of polyolefins
AssigneeReliance Industries Limited
InventorsKamlesh Singala, Saurabh Singh, Virendrakumar Gupta
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Abstract
A semi-continuous process and system thereof, for the synthesis of a narrow particle size distribution Zeigler Natta procatalyst for use in the manufacture of polyolefins. The process comprises: (a) mixing a reaction mixture containing a titanium compound; (b) charging a first reactor with said reaction mixture; (c) removing excess reactants from said first reactor as a filtrate; (d) feeding said filtrate to at least one further reactor; and continuously removing excess reactants from said at least further reactor.
Claims27
A semi-continuous process for the synthesis of a narrow particle size distribution Zeigler Natta procatalyst for use in the manufacture of polyolefins comprising of following steps:
- (a) mixing a reaction mixture essentially consisting of titanium compound having at least one titanium halogen bond and a chlorinated solvent in feed section;
- (b) charging a first reactor with said reaction mixture;
- (c) continuously removing excess reactants from said first reactor as a filtrate through a filtrate section placed at the bottom of said first reactor;
- (d) feeding said filtrate to at least one further reactor connected to said first reactor to retain the carried over fine particles from said first reactor;
- continuously removing excess reactants from said at least further reactor as a filtrate through a filtrate section placed at the bottom of said at least one further reactor and, optionally, feeding said filtrate to next said at least one further reactor;
- (e) repeating step (d) for n number of times in series, wherein reactors are arranged in series or parallel;
- (f) subjecting the said filtrate from the last of said at least one further reactor to a distillation section to remove impurities and recover the distillate;
- and continuously charging the distillate from the distillation section to the feed section;
- wherein a desired equilibrium between fresh and recovered distillate and a desired resultant concentration of reactant feed are maintained;
- and
- (g) optionally treating the residue from distillation section with an alkali to obtain titanium hydroxide and calcining said titanium hydroxide to obtain titanium oxide as a by product.
A system for the semi-continuous synthesis of a narrow particle size distribution Zeigler Natta procatalyst for use in the manufacture of polyolefins, said system consisting essentially of:
- (a) a feed section provided with an inlet for input of reactants and fresh solvent and optionally a second inlet for input of recovered distillate;
- (b) a first reactor connected downstream of said feed section to receive a reaction mixture formed in said feed section, said first reactor being provided with a filtration element at the bottom thereof to remove excess reactants therefrom as a filtrate;
- (c) at least one further reactor provided downstream of said first reactor and connected thereto to receive the filtrate from said first reactor and to retain carried over fine particles from said first reactor, said second reactor being provided with a filtration element at the bottom thereof to remove excess reactants therefrom as a filtrate for feeding into a distillation unit or, optionally, to a subsequent further reactor;
- (d) a distillation unit provided downstream of said at least one further reactor to remove impurities and recover a distillate, for charging the feed section to maintain a desired equilibrium between fresh and recovered solvent and a desired resultant concentration of reactant feed;
- (e) optionally a calcination section to calcine residue from the distillation section and obtain titanium hydroxide as a byproduct.
Dependencies are inferred from the claim text.