Siloxane mixture and method for controlling polymerization rate of small bulk polypropylene process
A small bulk polypropylene and siloxane mixture technology, which is applied in the field of propylene polymerization in the petrochemical industry, can solve the problems of unsatisfactory high-flow polypropylene production and low melt index, achieve delayed concentrated release, reduce peak polymerization rate, and prolong The effect of active time
Active Publication Date: 2018-02-09
CHINA PETROLEUM ENG CORP LTD
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- Application Information
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Problems solved by technology
[0003] The present invention provides a siloxane mixture and a method for regulating and controlling the polymerization speed of the small-bulk polypropylene process, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem of low melting index of existing products prepared by the small-bulk polypropylene process. It has been unable to meet the problems of high flow polypropylene production
Method used
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Embodiment 1
[0022] Embodiment 1, the raw material of the siloxane mixture includes tetrasiloxy compound and trisiloxy compound; wherein: the mass percentage of tetrasiloxy compound in the siloxane mixture is 50% to 70%.
Embodiment 2
[0023] Embodiment 2, the siloxane mixture, the raw material includes tetrasiloxy compound and trisiloxy compound; wherein: the mass percentage of tetrasiloxy compound in the siloxane mixture is 50% or 70%.
Embodiment 3
[0024] Example 3, as an optimization of the above example, the siloxane mixture is obtained according to the following preparation method: After uniformly mixing the required amount of tetrasiloxy compound and trisiloxy compound, the siloxane mixture is obtained.
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Abstract
The invention relates to the technical field of propylene polymerization in the petrochemical industry, and relates to a siloxane mixture and a method for regulating and controlling the polymerization speed of small bulk polypropylene technology; the raw materials of the siloxane mixture include tetrasiloxy compounds and trisiloxy compounds; wherein : The mass percentage of the tetrasiloxy compound in the siloxane mixture is 50% to 70%. The present invention avoids the negative impact brought by the introduction of a large amount of hydrogen by adding the siloxane mixture when preparing high-flow polypropylene; at the same time, the addition of the siloxane mixture delays the concentrated release of the catalytic activity of the catalyst and prolongs the activity of the catalyst The time reduces the peak polymerization rate of the catalyst without reducing the overall catalytic efficiency of the catalyst and does not affect the performance of the prepared polypropylene, which is beneficial to the process control of small bulk polypropylene in the preparation of high flow polypropylene.
Description
technical field [0001] The invention relates to the technical field of propylene polymerization in the petrochemical industry, and relates to a siloxane mixture and a method for regulating and controlling the polymerization speed of a small bulk polypropylene process. Background technique [0002] The small bulk polypropylene process, also known as the intermittent liquid-phase bulk polypropylene process, adopts a single polymerization tank for intermittent operation. It is self-researched and developed in my country. It is the basis for domestic refineries with abundant gas and propylene resources, but the distribution of refineries is relatively scattered. developed on. Due to the reliable production technology of this process, the quality requirements for raw material propylene are not very high, the required catalyst is guaranteed in China, the process is simple, the investment is low, the effect is fast, the operation is simple, the three wastes are less, and it is suita...
Claims
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IPC IPC(8): C08F2/38C08F110/06
Inventor 王晓刚雷华宋清山王嘉春薛巍黄新奎魏建东田拥军赵伟
Owner CHINA PETROLEUM ENG CORP LTD