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Process of precious metal recovery and color removal from an organosilicon product-containing liquid reaction medium

A liquid reaction, precious metal technology that is commercially viable and economical to solve problems such as the recovery of precious metal catalysts

Inactive Publication Date: 2014-03-05
MOMENTIVE PERFORMANCE MATERIALS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Current methods do not desirably react liquids from a liquid reaction medium containing a precious metal catalyst, such as from a continuous siloxane copolymer plant or a continuous silane hydrosilylation plant, that contains a silicone product before the liquid reaction medium is transferred to a product storage vessel. medium) to recover precious metal catalysts
Furthermore, current methods do not desirably recover precious metals from liquid reaction media containing precious metal catalysts containing organosilicon products, such as liquid reaction media from continuous silane distillation units, before the liquid reaction media is passed to a silane heavy waste storage vessel catalyst

Method used

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  • Process of precious metal recovery and color removal from an organosilicon product-containing liquid reaction medium
  • Process of precious metal recovery and color removal from an organosilicon product-containing liquid reaction medium
  • Process of precious metal recovery and color removal from an organosilicon product-containing liquid reaction medium

Examples

Experimental program
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Effect test

Embodiment approach

[0023] According to one embodiment of the present invention, directly at the source of the liquid reaction medium containing the noble metal catalyst containing the organosilicon product, such as a continuous siloxane copolymer device, a continuous silane hydrosilylation device or a continuous silane distillation device and product or waste storage When a fixed-bed precious metal adsorption device is installed between the vessels, the liquid reaction medium containing the organic silicon product passes through the source of the liquid reaction medium containing the organic silicon product and is directly fed into the fixed-bed precious metal adsorption device. The fixed-bed precious metal adsorption device and pipe between the source of the liquid reaction medium containing the organic silicon product and the fixed-bed precious metal adsorption device are insulated to maintain the high temperature of the liquid reaction medium, thereby adsorbing the precious metal onto the adsorb...

Embodiment 1A-1D

[0057] In Examples 1A-1D, a fixed bed adsorption device with the above specifications was used to treat siloxane-A at a specific temperature and residence time. The fixed-bed adsorption device with the above specifications is directly placed between the siloxane-A feed reservoir (that is, a continuous siloxane manufacturing device in large-scale commercial production) and the product storage container for siloxane liquid The reaction medium continuously passes through a fixed bed adsorption device to recover precious metals. Example 1A used relatively high temperature and relatively long residence time for recovery studies. Example 1B uses a shorter residence time than Example 1A to study the residence time effect. Example 1C uses a lower temperature than Example 1B to study the temperature effect. Example 1D used the same conditions as Example 1B, but the experiment was conducted with an extended period of time to study the durability of the adsorbent and evaluate the achiev...

Embodiment 1A

[0059] The recovery of platinum from the product siloxane-A by means of fixed bed adsorption treatment was completed at 75°C and a residence time of 74 minutes. In this experiment, 8.8Kg (BV=142) of siloxane-A was processed by a fixed bed adsorption device with the above specifications, and the result was:

[0060] Platinum content after treatment: 0.37ppm (recovery rate=93.0%)

[0061] Product color after treatment: 40pt-co

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Abstract

The present invention relates to a process for recovery of a precious metal catalyst from an organosilicon product-containing liquid reaction medium containing precious metal catalyst.

Description

Background technique [0001] The present invention relates to a method for recovering a precious metal catalyst from a liquid reaction medium containing a silicone product containing a precious metal catalyst. Specifically, the present invention relates to a method for recovering a precious metal catalyst from a liquid reaction medium containing a silicone product containing a precious metal catalyst, wherein the liquid reaction medium is prepared by a precious metal-catalyzed hydrosilylation process. [0002] The hydrosilylation reactions used to synthesize organosilicon, ie, organosiloxane or organosilane products, are well known and usually involve the use of active silane-hydrogen and / or hydrogen in the presence of noble metal catalysts such as platinum (Pt), rhodium and palladium. -The silane or silicon polymer of the siloxy device catalyzes the hydrosilylation of aliphatic unsaturated compounds. As a result, the precious metal catalyst remains in the reaction medium containi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D15/00C08G77/34C01G55/00B01J20/00C22B11/00
CPCB01D15/00B01J20/20C22B11/048B01D15/361B01D15/3828B01J20/103Y02P10/20
Inventor H.白S.弗拉姆
Owner MOMENTIVE PERFORMANCE MATERIALS INC
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