Issue 44/2012 - Two achievements of the Petrochemical Institute were granted invention patents

The two achievements of the petrochemical institute were authorized as invention patents

Recently, 6 scientific research achievements of China Petrochemical Research Institute have been authorized
by the state.
Among them, two achievements in the preparation and application of modified titanium-magnesium catalyst and ethylene homopolymerization catalyst have been authorized
for invention patents.

The development of wide/bimodal relative molecular mass distribution of polyethylene resins can achieve high performance, but the development of corresponding catalysts is key
.
To this end, the Petrochemical Institute has developed a modified titanium-magnesium catalyst preparation technology
for the synthesis of modified titanium-magnesium catalysts that can control the relative molecular mass distribution of polyethylene.

The patented technology solves the problem of low activity and insensitive hydrogen modulation of general catalysts, and the preparation process is simple and the raw materials are easy to obtain
.
The prepared catalyst has high activity, high copolymerization and good hydrogen modulation sensitivity
.
The catalyst uses porous silica gel and anhydrous magnesium chloride as the carrier, uses the supported titanium-containing metal as the active component, adds different electron-donating compounds as modifiers, improves the catalyst activity, and produces polyethylene with controllable relative molecular mass distribution by ethylene
homopolymerization or copolymerization with α-olefins.
The product has good particle form, uniform particles, high bulk density, wide and adjustable relative molecular mass distribution, and improved resin processing performance
.

The ethylene homopolymerization catalyst patent provides an improved catalyst
for ethylene gas phase polymerization or copolymerization.
By adding thiocyanate triethoxysilane modifier to the preparation of the catalyst active component matriethoxysilane, the obtained catalyst component was used together with the organoaluminum cocatalyst for ethylene polymerization or copolymerization reaction, and the catalytic activity was significantly improved, and the particle morphology and particle size distribution of the product polyethylene were also significantly improved
.

The catalyst prepared by this technology is suitable for homopolymerization of ethylene or copolymerization
with other advanced α-olefins.
The polymerization process adopts gas phase method, slurry method and solution method, which is more suitable for gas phase fluidized bed polymerization, especially the condensing or ultra-cold operation
of gas phase fluidized bed.
When the catalyst prepared by the traditional method is used in the vapor phase fluidized bed condensation technology, the activity is significantly reduced due to the shortened residence time of the catalyst, resulting in an increase in the ash content of the ethylene polymer, which affects the polymer performance
.
(Hu Yan)