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Process for removal of odors from silicones

A siloxane, cyclic siloxane technology, used in chemical instruments and methods, silicone organic compounds, dry cleaning fiber products, etc.

Inactive Publication Date: 2003-05-28
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicone solvents sometimes have undesirable odors, so it is necessary to remove odors from silicone solvents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Disposal of recovered cyclic siloxanes used as anhydrous cleaning solvents (D 5 ) to remove the odor. Approximately 100 grams of used odorous silicone solvent was mixed with 25 grams of different absorbents to form a slurry. The slurry was mixed for 6 hours at ambient temperature. The absorbent was removed by filtration and the silicone solvent was evaluated olfactively to determine the effectiveness of the purification method. The results and the absorbent used are shown in Table 1 below.

[0039] Absorbent number

Absorbent type

A

Diatomaceous earth (Celite  545)

B

4A molecular sieve

C

13X molecular sieve

D

Silica gel, 60-200 mesh

E

Granular Activated Carbon

F

acid clay

G

sodium bicarbonate

H

Sodium carbonate

I

fuller's earth

J

Powdered decolorizing carbon (Norit  )

K

Powdered 13X Molecular Sieve

[0040] experime...

Embodiment 2

[0049] A second set of experiments was performed with reduced contact time and a simulated in-line purification method using silicone anhydrous cleaning solvents passed through glass tubes (approximately 1 / 2 inch diameter) containing the various absorbents. The purified siloxane solvent was again olfactory evaluated to determine the effectiveness of the purification method. The results and the absorbent used are shown in Table 2 below.

[0050] experiment

[0051] The same grade ratio as in Example 1 was used.

Embodiment 3

[0053] Carry out similar experiment with embodiment 1, with linear siloxane solvent (MD 2 M) instead of cyclic siloxanes. MD 2 M sample mixed with 10% D containing odor components 5 . Table 3 represents the treatment of 200 g of D mixed with various off-flavors (propionaldehyde (0.0145 g), propionic acid (0.0330 g), butyraldehyde (0.0210 g) and butyric acid (0.0353 g)). 5 And then analyze the results of the samples both olfactory and by GC (Gas Chromatography). Approximately 40 g of the odor-spiked linear silicone solvent was mixed with 10 g of different absorbents to form a slurry. The slurry was mixed for 6 hours at ambient temperature, filtered to remove the absorbent, and the silicone solvent was olfactory evaluated to determine the effectiveness of the purification process. The results and the absorbent used are shown in Table 3 below.

[0054] experiment

[0055] The same grade ratio as in Example 1 was used.

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PUM

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Abstract

A process for removing malodorous elements from silicone dry cleaning solvents, comprising contacting the used silicone solvent with adsorbent to remove the odor, and separating the silicone solvent.

Description

technical field [0001] The present invention relates to a method, and more particularly, to a method of removing malodorous components from silicone anhydrous cleaning solvents. Background of the invention [0002] Current waterless cleaning technologies use perchlorethylene (PERC) or petroleum-based materials as cleaning solvents. PERC has issues with toxicity and odor, and petroleum-based products are not as effective as PERC at cleaning clothing. Volatile siloxanes have been introduced into the waterless cleaning industry as PERC replacements. However, silicone solvents sometimes have undesirable odors, and therefore it is desirable to remove odors from silicone solvents. [0003] Methods for purifying organopolysiloxanes using elemental metals have been reported in recent years (see US Pat. No. 5,245,067). Other patents also disclose the purification of polyethers by contact with an aqueous acid and removal of the resulting malodorous substances (see US Patent 5,118,7...

Claims

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Application Information

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IPC IPC(8): C07F7/02C07F7/21C08G77/34D06F43/08D06L1/02D06L1/10
CPCC08G77/34D06F43/085D06L1/10Y10S210/916D06L1/00
Inventor R·J·佩里J·A·基尔戈S·B·多尔恩
Owner GENERAL ELECTRIC CO