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Evaluation process for gas-phase stirred bed catalyst

A catalyst and stirred bed technology, which is applied in the field of polyolefin catalyst polymerization evaluation process, can solve the problems of uneven catalyst dispersion, lack of catalyst, large particles, etc., and achieve good polymerization performance, less agglomeration, and cost reduction.

Active Publication Date: 2022-05-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process lacks the control of the catalyst addition process, and it is easy to cause uneven dispersion of the catalyst in the reactor, large particles, and even agglomeration when the heat release is severe.

Method used

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  • Evaluation process for gas-phase stirred bed catalyst
  • Evaluation process for gas-phase stirred bed catalyst
  • Evaluation process for gas-phase stirred bed catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Described gas-phase stirred bed catalyst evaluation process, specific operation steps are as follows:

[0051] 1. Pretreatment of the polymerization kettle, drying the polymerization kettle in the oven for 2 hours, then putting on the kettle, and vacuuming the polymerization kettle, keeping the vacuum to -0.1MPa for 10 minutes, then replenishing nitrogen to 0.1MPa, and then Vent the nitrogen and repeat the operation at least three times. After the operation, the pressure in the kettle was maintained at 0.1MPa.

[0052] 2. Preheat the polymerization kettle, start the polymerization kettle to stir, open the temperature control system to raise the temperature of the polymerization kettle, and control the preheating temperature to 50°C.

[0053] 3. Add catalyst, through figure 1 The feeder shown adds the catalyst to the polymerization tank, and the steps are as follows:

[0054] 3.1 Empty the polymerization kettle, then evacuate to -0.1MPa, and close the vacuum valve.

...

Embodiment 2

[0068] Test process is as embodiment 1, wherein:

[0069] Step 2: The polymerization kettle is pre-heated, and the temperature is 65°C.

[0070] Step 3.4 The stirring speed is 300 rpm.

[0071] Step 3.6 The flow rate of nitrogen gas is 150mL / min.

[0072] The analysis results are shown in Table 1.

Embodiment 3

[0074] Test process is as embodiment 1, wherein:

[0075] Step 2: The polymerization kettle is pre-heated, and the temperature is 75°C.

[0076] Step 3.4 The stirring speed is 400 rpm.

[0077] Step 3.6 nitrogen 200mL / min.

[0078] The analysis results are shown in Table 1.

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Abstract

The invention relates to a polymerization evaluation process of a polyolefin catalyst, in particular to a gas-phase stirred bed catalyst evaluation process. Comprising the following steps: (1) pretreating a polymerization kettle; (2) pre-heating the polymerization kettle; (3) adding a catalyst: adding the catalyst into the polymerization kettle through a feeder; (4) supplementing pressure; a novel catalyst feeding process is developed, a gas-phase polymerization operation method adaptive to the process is developed on the basis, when gas-phase polymerization evaluation is carried out by adopting the process, the polymerization activity of the catalyst is more favorably exerted, and under the same conditions, the activity of the catalyst is high, the number of polymer agglomerates in the reaction process is small, and the yield of the catalyst is high. And meanwhile, closed feeding is realized, environmental pollution is avoided, and the operation environment is improved.

Description

technical field [0001] The invention relates to a polyolefin catalyst polymerization evaluation process, in particular to a gas phase stirred bed catalyst evaluation process. Background technique [0002] Polyolefin plastics, that is, polymers of olefins, are the polymer materials with the largest output and the most applications, among which polyethylene and polypropylene are the most important. Due to the characteristics of abundant raw materials, low price, easy processing and molding, and excellent comprehensive performance, it is the most widely used in real life, and its application in automobiles is becoming more and more important, and there is a trend of gradual expansion. [0003] The key to the performance of polyolefin resins lies in the catalysts used. At present, most industrial polyethylene resins are mainly produced using traditional Ziegler-Natta titanium-based catalysts and chromium-based catalysts. Titanium-based polyethylene catalysts are well developed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/00G01N31/10
CPCB01J8/0015B01J8/001G01N31/10Y02P20/52
Inventor 周建勇李晓庆范大鹏李功韬徐晓朱卫东裴小静
Owner CHINA PETROLEUM & CHEM CORP
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