Solids passivation

A technology of solid and composition, applied in the field of solid passivation, which can solve the problems of increasing the amount of waste and expensive methods

Inactive Publication Date: 2011-02-02
DOW CORNING CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These negative factors, together with the large amount of added water remaining after the reaction, make this method expensive
Another method of passivating direct process solids is to mix the direct process solid material with clay, however, this method increases the amount of waste generated, and the direct process solid material remains active for some time after mixing with the clay

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Passivation of solid materials by direct method

[0051] Batches of direct process solids and passivating compositions were prepared varying the amounts of clay, alkali and water. Batches were prepared as described below. The clay (kaolin), direct process solids, water and base were measured into a beaker and mixed by hand with a metal stirrer until well combined. The base used in the examples is first dissolved and / or diluted with water, or made into a water slurry. In the following examples, this water constituted the final water listed in each batch. Then according to "Recommendation on the transport of Dangerous Goods, Manual of Test and Criteria" (1995), United Nations, New York and Geneva, ISBN 92-1-139049-4, by forming into 4 inch cubes, at 140°C Bake the cubes in an oven and monitor the temperature of the cubes for 24 hours to test the self-heating of the batch. In this test, a temperature rise of the cube composition above 200°C is considered self-heating. ...

Embodiment 2

[0064] In a large-scale continuous process plant test, kaolin clay and direct process solids were fed from a hopper to a mixer by means of a screw conveyor. The direct process solids are fed into the screw conveyor by means of a rotary valve to control the ratio of clay to direct process solids entering the mixer. Limestone slurry was pumped into the mixer from a large tote through the inlet of the mixer with a 2 inch double diaphragm pump. The amount of limestone slurry added to the mixer is adjusted to achieve the desired consistency of the product leaving the mixer. Six different ratios of clay to direct process solids were tested and individually tested for self-heating and monitoring time for product to return to ambient temperature. Table 4 gives the test results for days from heating and product return to ambient temperature. Combine Test Trials 25 and 26 to test the time to self-heat and return to ambient temperature.

[0065] Table 4: Test results for self-heating ...

Embodiment 3

[0069] Batches of the compositions of the invention were prepared in the laboratory on a small scale, varying the ratio of clay to waste. Limestone slurry was used as base and added with direct process solids at varying ratios. The resulting compositions were evaluated for self-heating and % water. The results are summarized in Table 4 below.

[0070] Table 5: Compositions of the invention and their results for self-heating and water content

[0071]

[0072] The results in Table 5 show that the ratio of clay to direct process solids can be reduced to 0.05:1, and the ratio of limestone to direct process solids to 0.1:1, while producing compositions without self-heating. Furthermore, the percentage of water in the final product can be as low as 18.5%.

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PUM

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Abstract

The invention pertains to a method of passivating direct process solids (1) and to passivated and quenched compositions resulting from said method. The method of passivating direct process solids (1) according to the invention comprises combining direct process solids (1) with a passivating composition comprising clay (2), base (3), and water (4). The passivated composition of the invention comprises direct process solids (1) and a passivating composition comprising clay (2), base (3), and water (4). The quenched composition of the invention comprises the passivated composition, wherein the passivated composition has been held for a sufficient period of time for the reactive species from the direct process solids to be substantially quenched and / or oxidized.

Description

[0001] Cross References to Related Applications [0002] none Background of the invention [0003] Organohalosilanes, halosilanes, and especially methylchlorosilanes, are structural blocks that produce siloxane polymers. Organohalosilanes and halosilanes are produced commercially by a process commonly referred to as the "direct method," in which silicon metal is reacted with an organohalide or hydrogen chloride, optionally in the presence of a catalyst. Aspects of direct methods are well known in the art and described in the patent literature. [0004] For example, in the commercial production of methylchlorosilane by the direct method, silicon powder is fluidized by passing methyl chloride gas at a temperature of 200°C to 500°C in a fluidized bed, so that fine silicon metal powder is mixed with Methyl chloride reacts in the presence of a catalyst. At the end of the reaction, solid material is present in the fluidized bed. When preparing halosilanes, similar procedures are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/132B09B3/00
CPCC04B2235/3201C04B33/16C04B33/1325B09B3/0041B09B3/0025C04B35/016C04B33/04C04B33/1352C04B2235/3208Y02P40/60B09B3/25B09B3/20
Inventor C·J·科赞斯克D·C·米勒
Owner DOW CORNING CORP
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