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Method for removing impurities from olefin polymers

A technology for olefin polymers and impurities, which is applied in the field of removing residual ionic liquids and/or supported catalysts in olefin polymerization reactions, and can solve problems that do not involve the removal of residual ionic liquids and/or supported catalysts

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] None of the above reports involved the removal of residual ionic liquids and / or supported catalysts caused by the use of ionic liquids in olefin polymerization reactions

Method used

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  • Method for removing impurities from olefin polymers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 200 g of polyα-olefin product A into a 1000 ml three-necked flask, add 0.2 g of magnesium silicate (0.1 wt % of the weight of the polymer) into the three-necked flask, and stir rapidly at 50° C. for 30 min. After stirring, the adsorbent precipitated and was filtered to obtain pure and transparent polyolefin product A1. The content of elements Cl, N, and Al in A1 is shown in Table 1 below. The number average molecular weight of A1 is 2000, and it can be used as lubricating oil base oil after hydrofining.

Embodiment 2

[0032] Add 200 g of the polyalphaolefin product A into a 1000 ml three-necked flask, add 100 g of distilled water to the three-necked flask, stir at 40° C. for 30 min, remove the water in layers, and add 5 g of magnesium silicate (2.5% of the weight of the polymer) to the organic layer. wt%), stirred rapidly at 50°C for 60min. After the stirring is completed, the adsorbent precipitates and is filtered to obtain a pure and transparent polyolefin product A2. The contents of Cl, N and Al in A2 are shown in Table 1 below. The number average molecular weight of A2 is 2000, and it can be used as lubricating oil base oil after hydrofining.

Embodiment 3

[0034] Add 200g of polyalphaolefin product A into a 1000ml three-necked flask, add 600g of 1% NaOH aqueous solution to the three-necked flask, stir for 30min at 20°C, remove the NaOH aqueous solution in layers, and add 10g of magnesium silicate to the organic layer (5wt% of the weight of the polymer), stirring rapidly for 45min at 30°C. After the stirring, the adsorbent precipitated and was filtered to obtain a pure and transparent polyolefin product A3. The contents of Cl, N, and Al of A3 elements are shown in Table 1 below. A3 has a number average molecular weight of 2000 and can be used as lubricating base oil after hydrofining.

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Abstract

The invention introduces a method for removing impurities from olefin polymers. The method comprises the steps of adding a certain amount of adsorbents into the olefin polymers; making the adsorbents fully contacted with the olefin polymers at a certain temperature, so that the impurities in the olefin polymers are sufficiently adsorbed by the adsorbents; and separating the adsorbents and the olefin polymers to obtain the purified olefin polymers, wherein the adsorbents are one or more selected from silicate, alkali metal or alkaline earth metal oxide and carclazyte; the olefin polymers comprise the olefin polymers obtained via a polymerization by using olefins of C2-C20 as raw materials and am ionic liquid as a catalyst, and the olefin polymers obtained via a polymerization by using the ionic liquid loaded with catalysts as a catalyst. The method has the advantages of high efficiency in removing impurities, high product quality, etc.

Description

technical field [0001] The present invention relates to a method for removing residual impurities from olefin polymers, more specifically, a method for removing residual ionic liquids and / or supported catalysts in olefin polymerization reactions. Background technique [0002] Olefin polymers have many uses, such as from C 2 ~C 20 The regular long-chain olefin polymers obtained by polymerization of α-olefins under the action of catalysts, among them, olefin polymers with a number average molecular weight of about 300 to 2,000 can be used as lubricating oil base oils; olefin polymers with a number average molecular weight of about 300,000 It can be used as a pour point depressant for lubricating oil. [0003] Olefin polymers can be prepared by polymerization of α-olefins in the presence of ionic liquids. Ionic liquid is an organic salt composed of organic cations and inorganic or organic anions that is liquid at or near room temperature. Ionic liquids can be used as solvent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F6/00
Inventor 张耀段庆华刘依农李玲
Owner CHINA PETROLEUM & CHEM CORP