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Methods for preparing catalyst precursor materials

A reagent and solvent technology, applied in the field of catalyst precursor material preparation, can solve the problems of batch purity change, production difficulty, thermal instability, etc.

Pending Publication Date: 2021-11-26
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the solutions used to produce these dihalo-substituted metalloids tend to dissociate even under mild conditions, making their production difficult and costly.
[0003] Current methods for preparing these catalyst precursor materials from dihalo-substituted metalloids require batch reactions, which are thermally unstable and lead to batch-to-batch variations in purity

Method used

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  • Methods for preparing catalyst precursor materials
  • Methods for preparing catalyst precursor materials
  • Methods for preparing catalyst precursor materials

Examples

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example

[0065] The embodiments are further illustrated by the following examples.

example 1

[0067] A first reagent feed tank was charged with 187 grams (g) of dichlorodiisopropylsilane (DCDIS), 388 g of bromochloromethane (BCM), and 1,781 g of tetrahydrofuran (THF) under nitrogen (N 2 ) layer under the mix. The first reagent feed tank is connected to the precooler by piping. 800 milliliters (mL) of 1.6 molar (M) hexane were introduced into the tubing. A vacuum pushes the contents of the tubing across the first heat exchanger (ie, a coil submerged in a bath filled with dry ice and acetone) and into the precooler at a flow rate of 1.2 mL per minute (1.2 mL / min). Once the contents of the tubes were introduced into the precooler, the agitator in the precooler started mixing its contents at 740 revolutions per minute (rpm). After the precooler has reached its desired capacity, its contents are introduced into the reaction zone through additional piping which fluidly connects the precooler and the reaction zone.

[0068] Once the pre-cooler started to flow into the reac...

example 2

[0082] The first reagent stream was generated by precooling a mixture of chloroiodomethane (CIM) and THF to -50°C. Simultaneously, a second reagent stream of 2.5M n-butyllithium in hexane was pre-cooled to -50°C. Pre-cooling is achieved by a separate heat exchanger (i.e., the pipe is inserted into a circulating bath with cooling silicone oil) and deposited into the first reaction zone where the mixture is mixed before being discharged into the second reaction zone. The reaction zone lasts 0.15 seconds to 0.3 seconds. The third reagent stream containing DCDIS and THF was pre-cooled to -50°C with a heat exchanger. The third reagent stream is then discharged to a second reaction zone where its contents mix with the contents of the first reaction zone.

[0083] Conditions for the continuous synthesis of catalyst precursor materials are provided in Table 3:

[0084] table 3

[0085] parameter value Residence time in the first reaction zone 0.15 seconds to 0.3...

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Abstract

Methods for preparing a catalyst precursor material from dihalo-substituted metalloids are provided. The methods include mixing a first solution of a halogenated alkane, at least one solvent, and a first component selected from a dihalo-substituted-group-14 metalloid or an organolithium reagent in a first reaction zone. Continuously adding the first solution to a second reaction zone, and continuously adding a second solution to the second reaction zone. The second solution including at least one solvent and a second component of either the dihalo-substituted-group-14 metalloid or the organolithium reagent, the second component is different from the first component. Mixing the first solution and the second solution in the second reaction zone.

Description

technical field [0001] The present specification generally relates to methods for preparing catalyst precursor materials from dihalo-substituted metalloids. In particular, the specification relates to methods for preparing catalyst precursor materials from dihalo-substituted Group 14 metalloids, haloalkanes, organolithium reagents, and solvents in sequential addition reactions. Background technique [0002] Linear low-density ethylene-based polymers are designed and increasingly used to meet the growing demand for packaging, hygiene and medical products. Dihalo-substituted metalloids can be used to form reaction catalysts for the production of linear low density ethylene-based polymer resins. However, the solutions used to produce these dihalo-substituted metalloids tend to dissociate even under mild conditions, which makes their production difficult and costly. [0003] Current methods for preparing these catalyst precursor materials from dihalo-substituted metalloids req...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F7/08C07F7/12C07F7/30
CPCC07F7/081C07F7/12C07F7/30C07F7/0827C07F1/02C08F10/02
Inventor J·戴瓦拉吉张春明S·D·菲斯特H·潘D·W·布雷洛克I·B·吉莱斯皮P·L·海德尔C·S·戴维斯A·伊冯-贝塞特
Owner DOW GLOBAL TECH LLC
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