A kind of recycling method of vinyltrichlorosilane waste catalyst

A technology of vinyl trichlorosilane and waste catalysts, which is applied in the field of collaborative recovery of waste catalysts produced in the production process of vinyl trichlorosilane, can solve the problems of platinum ineffective recovery, complex components, and low conversion rate, and achieve the elimination of silane The effect of low conversion rate of organic matter, low material consumption and energy consumption, and high recovery rate

Active Publication Date: 2021-12-31
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such substances are complex in composition and highly toxic, and are hazardous wastes; at the same time, because they contain a small amount of platinum, they have high economic value
[0005] However, at present, there are few studies on this type of spent catalysts, mainly using organic silicon in high boiling point residues to prepare monosilane, silicone oil, silicone water repellent, silicone resin, etc.
For example, the Chinese invention patent (application number: 201510951805.9) discloses a method of using vinyl high boilers to prepare silicone oil, by adding trimethylchlorosilane to avoid crosslinking of vinyl high boilers during hydrolysis, and at the same time in the reaction system Add catalyst tetrabutylammonium chloride to fully contact the reactants. Although this method can obtain silicone oil products, the conversion rate is low. At the same time, platinum cannot be effectively recovered, and the economic value is poor.

Method used

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  • A kind of recycling method of vinyltrichlorosilane waste catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Slowly add 500 parts of water to 100 parts of vinyltrichlorosilane spent catalyst, stir, and hydrolyze for 20 minutes. After hydrolysis is complete, press filter to obtain oil-water mixture and silicic acid. The density difference is used to separate hydrochloric acid and chlorobenzene in the oil-water mixture, hydrochloric acid is used for wet leaching of platinum group metals, and chlorobenzene is used for industrial raw materials. After the silicic acid is dehydrated and dried at 150°C, it is mixed with 100 parts of waste automobile exhaust catalyst, 100 parts of calcium oxide, 20 parts of iron powder, and 10 parts of coke powder, and melted at 1300°C. After the reaction is complete, the slag and gold are separated. An iron-based alloy phase rich in platinum group metals and a smelting slag are obtained.

Embodiment 2

[0034] Slowly add 600 parts of water to 100 parts of vinyltrichlorosilane spent catalyst, stir, and hydrolyze for 85 minutes. After hydrolysis is complete, press filter to obtain oil-water mixture and silicic acid. The density difference is used to separate hydrochloric acid and chlorobenzene in the oil-water mixture, hydrochloric acid is used for wet leaching of platinum group metals, and chlorobenzene is used for industrial raw materials. After the silicic acid is dehydrated and dried at 180°C, it is mixed with 150 parts of alumina carrier waste petrochemical catalyst, 100 parts of calcium oxide, 100 parts of sodium carbonate, 20 parts of calcium fluoride, 30 parts of iron oxide, and 50 parts of coke powder. Melting at ℃, after the reaction is complete, the slag and gold are separated to obtain an iron-based alloy phase rich in platinum group metals and smelting slag.

Embodiment 3

[0036] Slowly add 700 parts of water to 100 parts of vinyltrichlorosilane spent catalyst, stir, and hydrolyze for 150 minutes. After hydrolysis is complete, press filter to obtain oil-water mixture and silicic acid. The density difference is used to separate hydrochloric acid and chlorobenzene in the oil-water mixture, hydrochloric acid is used for wet leaching of platinum group metals, and chlorobenzene is used for industrial raw materials. After the silicic acid is dehydrated and dried at 200°C, it is mixed with 300 parts of alumina carrier waste petrochemical catalyst, 200 parts of calcium oxide, 30 parts of calcium fluoride, 40 parts of iron concentrate, and 40 parts of carbon powder, and smelted at 1400°C. After the reaction is complete, the slag and gold are separated to obtain an iron-based alloy phase rich in platinum group metals and smelting slag.

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Abstract

The invention belongs to the field of regeneration of platinum group metals, and specifically discloses a method for recycling waste vinyltrichlorosilane catalysts. The method comprises the following steps: hydrolyzing silane organic matter in the spent catalyst to obtain silicic acid and an oil-water mixture; separating hydrochloric acid and chlorobenzene in the oil-water mixture by using density difference; drying and dehydrating the silicic acid and mixing it with the waste automobile exhaust catalyst or the waste petrochemical catalyst; Synergistic recovery of platinum group metals by iron capture. The invention realizes the recovery of all components of the spent vinyl trichlorosilane catalyst, has the advantages of short process flow, low production cost, high platinum recovery rate, green and clean, and is suitable for industrialized production.

Description

technical field [0001] The invention belongs to the field of regeneration of platinum group metals, in particular to a method for synergistic recovery of spent catalysts produced in the production process of vinyl trichlorosilane. Background technique [0002] Vinyltrichlorosilane is an important raw material for the synthesis of vinyl-based organosilicon coupling agents. It is mainly synthesized by Karstedt catalyst through the addition reaction of acetylene and trichlorosilane. Karstedt catalyst is an organoplatinum compound. The reaction principle is as follows: [0003] C 2 h 2 +HSiCl 3 →CH 2 CHSiCl 3 [0004] A large number of side reactions inevitably occur in the production process, such as the further reaction of vinyl trichlorosilane and trichlorosilane to generate double addition products, namely 1,2-bis(trichlorosilyl)ethane, and the reaction to produce high boiling point of hexachlorodisilane. After the reaction, the product is separated by distillation to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B1/02C22B11/00C22B11/02
CPCC22B7/009C22B7/006C22B11/048C22B7/001C22B11/026C22B1/02Y02P10/20
Inventor 丁云集张深根
Owner UNIV OF SCI & TECH BEIJING
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