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Method and apparatus for preparing microsphere silicon dioxide carrier on gas-phase fluidized bed by polyvinyls catalyst

A gas-phase fluidized bed and ethylene polymerization technology, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of high energy consumption, long process, and long roasting time, and achieve low energy consumption and process The effect of short and prolonged residence time

Active Publication Date: 2008-02-20
吉化集团吉林市星云化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art of Application No. 200410039492.1 "Preparation Method of Microspherical Silica as Carrier of Olefin Polymerization Catalyst", the gel needs to be processed in a 3000-10000rpm shearing machine for 15-45 minutes after being refined in a colloid mill. Minutes, the obtained microspherical silica gel needs to be carried out in three stages in the roasting furnace (according to 100-200°C for 1-2 hours, 200-400°C for 0.5-1.5 hours, 550-750°C for 3- 5 hours program is carried out roasting) roasting, and required roasting time is long, and energy consumption is high; As can be seen, the prior art flow process is long

Method used

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  • Method and apparatus for preparing microsphere silicon dioxide carrier on gas-phase fluidized bed by polyvinyls catalyst
  • Method and apparatus for preparing microsphere silicon dioxide carrier on gas-phase fluidized bed by polyvinyls catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Refer to the method described in CN1657571A to prepare modified sol, take 10.7 kilograms of pure water and add to 80 liters of stainless steel comprehensive kettle 1 that is provided with electric stirrer and steam jacket, add 1% in this still After adding 0.5 kg of surfactant aqueous solution (modifier, the same below) and 25% to 28% chemically pure ammonia water in Pingping, start the electric stirrer, and make 6.67 kg of silicon dioxide by weight percentage 15% wet After the silicone gel is slowly added to the above kettle, turn on the steam switch for regular constant temperature heating. The temperature of the constant temperature timer controller is set to 90°C and the time is set to 4 hours (this process is automatically completed). Lower the temperature of the material liquid in the kettle to ≤50°C, then add 1.5 kg of acrylic acid solution (modifier) ​​with 80-90% modifier (modifier) ​​into the reaction kettle, stir the material for a short time, put the mate...

Embodiment 2

[0040] (1) refer to the step (1) of embodiment 1 and prepare SiO 2 20 kg of sol with a solid weight percentage of 9%.

[0041] (2) 20 kilograms of 9% solid silicon dioxide sols obtained in the above step (1) are added to the colloid mill 2 through the comprehensive kettle 1, and then 100 grams of urea modifiers are added, and then crushed, refined and emulsified After 5 minutes, it is sent to the slurry tank 3, and then sent to the atomizing disc 7 of 10 to 12 curved cylinders 8 provided on the top of the spray dryer 4 through the inlet 10 by the pump (the rotating speed is 9000 rpm). , the slurry is from the gap 9 between the atomized coiled cylinders 8 at a linear velocity of 58.9 m / s, and the temperature at the upper tangent inlet of the spray drier 4 sides from below (below the atomizing disc 7) is The hot air at 370°C (exhaust air temperature 160°C) rotates downwards in the same direction at high speed, and the fine particles enter the first-stage cyclone separator 6 thr...

Embodiment 3

[0043] (1) refer to the step (1) of embodiment 1 and prepare SiO 2 20 kg of sol with a solid weight percentage of 10%.

[0044] (2) 20 kilograms of above-mentioned sols with a percentage by weight of 10% solid silicon dioxide are added to the colloid mill 2 through the comprehensive kettle 1, and then 120 grams of urea modifier are added, and then crushed, refined and emulsified Send in the slurry tank 3 after 10 minutes, add 10 by the pump again and send into the atomizing disc 7 of 10~12 curved cylinders 8 that are provided with at the center of the spray drying machine 4 top (its rotating speed is 10000 rpm) , the slurry is from the slit 9 between the curved cylinders 8 of the atomizing disc 7 at a linear velocity of 72 m / s, and from the bottom of the atomizing disc (below the atomizing disc) at the upper tangent inlet of the spray drier 4 sides The hot air with a temperature of 380°C (exhaust air temperature 170°C) rotates downwards in the same direction at high speed, an...

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Abstract

Production and apparatus for microspheroidal silica carrier of gas-phase fluidized bed vinyl polymerization catalyst are disclosed. The process is carried out by adding modified sol into colloid mill, adding urea to treat, 3~20mins later, spray drying atomized disk on top, mixing with 300~400DEG C hot air from tangent inlet on top of spray drier, high-speed rotating downward, and putting it with microspheroidal silica from outlet on bottom of one-stage cyclone separator and spray drier into calciner for 1.5-2.0hrs to obtain final product. The granularity distribution is d50 30.15~48.59um, d10 9.23~214.97um, d9052.37~75.59um, packing density is 0.29~0.32g / ml, specific area is 297.2~310.2m2 / g,pore volume is 1.57~1.64ml / g and average aperture is 200+-20.

Description

technical field [0001] The invention relates to a preparation method and equipment for ethylene polymerization, ethylene and alpha olefin copolymerization catalyst carrier, in particular to a preparation method and equipment for gas-phase fluidized bed ethylene polymerization catalyst microspherical silica carrier. Background technique [0002] Ethylene is the main representative product of petrochemical industry. The production and application of ethylene products is an important measure to measure the petrochemical development level of a country and region. Polyethylene is the most important downstream derivative of ethylene, accounting for about 70% of the world's total ethylene. [0003] The catalyst made of micro-spherical silica as a carrier has been widely used in the production of linear low-density polyethylene (LLDPE) by fluidized bed reaction and the production of high-density polyethylene (HDPE) by fluidized bed reaction. 30% of total polyethylene production. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/02C08F2/34C08F4/02C09C1/28C09C3/00
Inventor 谭刚杨万军马艳玲李晓文张汉倬
Owner 吉化集团吉林市星云化工有限公司
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