Preparation method of catalyst containing trivalent vanadium, vanadium catalyst composition and application thereof

Abstract

The invention provides a preparation method of a catalyst containing trivalent vanadium. The preparation method comprises the steps of dissolving vanadium pentoxide or sodium metavanadate with concentration sulfuric acid or concentrated hydrochloric acid, reacting under the action of oxalic acid, and controlling the pH value to be 2-4; then adding sodium sulfite or sodium hydrosulfite to react, and controlling the pH value to be 5.5-7, thus obtaining a water solution containing a trivalent vanadium compound; mixing the water solution containing the trivalent vanadium compound, a saturated alkane solution containing an extraction agent and an extraction aid and 0.5-2mol / L of sodium hydroxide solution and stirring the materials, and discharging the water phase after oscillating and layering, thus obtaining the catalyst containing trivalent vanadium, wherein the extraction agent is organic carboxylic acid; the extraction aid is organic monobasic phosphoric acid or organophosphate. The preparation method is simple. The obtained catalyst has good stability and safety; when the catalyst is used for preparing ethylene propylene rubber (EPR), the cost can be reduced, and EPR with excellent properties can be obtained.

Description

technical field [0001] The invention relates to the field of ethylene-propylene rubber catalysts, in particular to a preparation method of a catalyst containing trivalent vanadium, a vanadium catalyst composition and applications thereof. Background technique [0002] Vanadium-based compounds are mostly used as catalysts in the production of ethylene-propylene rubber at home and abroad. The valence of vanadium in these vanadium-based compounds is generally trivalent, tetravalent or pentavalent. Among them, there are few studies on the use of trivalent vanadium compounds in the preparation of ethylene-propylene rubber, and currently there are mainly VCl 3 , V(acac) 3 , V 5-9 Acid compounds and V 5-9 -Et 3 Al 2 Cl 3 system. [0003] In the study on the mechanism of vanadium-based catalysts catalyzing the copolymerization of ethylene and propylene, (C.Lorber, B.Dommadieu and E.Choukroun Organometallic, 2000,19,1963.), regarding the vanadium valence state of the active ce...

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Problems solved by technology

Therefore, starting from the above-mentioned copolymerization mechanism, V 3+ As the main catalyst for the production of ethylene-propylene rubber, the compound can achieve the purpose of improving the polymerization activity and saving the amount of alkyl aluminum compounds, but due to the V 3+ The valence state of the compound is not easy to stabilize, and several existing V 3+ There are numerous problems with the preparation and use of compounds

[0004] For example, VCl 3 , also by V 2 o 5 It is produced by high-temperature chlorination, and the large-scale use of chlorine not only damages the health of operators, but also causes serious environmental pollution; on the other hand, VCl 3 , is volatile, highly toxic, decomposes in air, and explodes in water, which brings a lot of inconvenience to storage, transportation and use

As a by-product of paraffin oxidation, pentanoic acid was rich in sources and cheap at that time. Vanadium pentanoic acid (abbreviated as V 5-9 ) is soluble in aliphatic hydrocarbon solvent again, but in its synthetic process, need +5 valent oxide (V 2 o 5 ) to synthesize V 3+ Vanadium oxide (V 2 o 3 ), the process is complicated, the equipment requirements are high, and there is no penta-nonacid product, which cannot be applied in industrial production

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