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If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/449/386/product-dating-information-mk.pdf
306312
Inhibitor removers
Prepacked column for removing hydroquinone and monomethyl ether hydroquinone
Synonyme(s) :
Inhibition Removal Agents
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About This Item
Produits recommandés
Pression de vapeur
17 mmHg ( 20 °C)
Forme
beads
Taille de la colonne
17 mm × 240 mm
Chaîne SMILES
[Al]21O[Al](O2)O1
InChI
1S/2Al.3O
Clé InChI
TWNQGVIAIRXVLR-UHFFFAOYSA-N
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Catégories apparentées
Description générale
• Useful in applications which require that the stabilizer or inhibitor (hydroquinone (HQ), hydro-quinone monomethyl ether (MEHQ, 4-methoxyphenol), or 4-tert-butylcatechol (TBC) be removed prior to use.
• Columns may be discarded1 when exhausted or reused by filling column approximately 3/4 full with new packing material. HQ/MEHQ columns refill vol.: ~21g. TBC column refill vol.:~30g.
• Approx. column capacity:
HQ/MEHQ: 3L at 100ppm
TBC: 4L at 15ppm
• TBC columns and packings are not recommended for use with polar solvents, including acrylic acid. Vacuum distillation is suggested for such applications.
Easy-to-use:
1. Prewashing of prepacked glass columns with a small amount of monomer is recommended.
2. Add monomer (or solvent) to an addition funnel which is secured above column.
3. Add monomer dropwise to the column. Monitor rate of addition to prevent overflow of the column. Collect monomer in an appropriate container.
4. For low-melting solid monomers, keep temperature of column above the melting point during use.
Caution: Overheating may cause monomer to polymerize on the column. Viscous or high-melting monomers may be diluted in an appropriate solvent before addition to the column.
1Unused columns can be discarded with other solid chemical waste. After use, the toxicity and hazards of the monomer, from which the inhibitor is being removed, should be considered in deciding how to dispose of the packing material or column.
Application
Code de la classe de stockage
11 - Combustible Solids
Classe de danger pour l'eau (WGK)
WGK 3
Point d'éclair (°F)
Not applicable
Point d'éclair (°C)
Not applicable
Équipement de protection individuelle
Eyeshields, Gloves, type N95 (US)
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Articles
An article regarding common FAQs for initiators and stabilizers.
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How can I determine the shelf life / expiration / retest date of this product?
1 answer-
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How is shipping temperature determined? And how is it related to the product storage temperature?
1 answer-
Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf
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Would these work for removal of Topanol A, 2,4-Dimethyl-6-tert-butylphenol CAS Number:1879-09-0?
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This product is not tested for removal of Topanol A, but is expected to be suitable. The product is used for inhibitor removal for product 276685. Methacrylic anhydride, which contains 2,000 ppm Topanol A as inhibitor.
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Which side of the column is the top versus the bottom?
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The label is placed at the top of the column and will include the lot number. The column is provided with a cap on each end; these caps would need to be removed when the column is in use, but replaced between uses.
The glass wool plugs are present to hold the beads inside the column. Initially, a small volume of liquid will wet the glass wool. As more volume is added, the column will become saturated and then eventually pass through and out at the bottom of the column.
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Can Product 306312, Inhibitor removers - Prepacked column for removing hydroquinone and monomethyl ether hydroquinone, be used to remove butylated hydroxytoluene (BHT)?
1 answer-
This inhibitor remover is not intended to remove BHT present in a monomer solution; little, if any, BHT will be removed with this column. Unfortunately, Sigma-Aldrich does not currently offer a inhibitor-remover column that will accomplish this purpose.
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How much can Product 306312, Inhibitor removers - Prepacked column for removing hydroquinone and monomethyl ether hydroquinone, hold at one time?
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This product has a bed volume of approximately 30 mL.
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Can Product 306312, Inhibitor removers - Prepacked column for removing hydroquinone and monomethyl ether hydroquinone, be used more than once?
1 answer-
This pre-packed inhibitor remover column is meant for single use but can be rinsed and reused. If time will pass between uses, this column can be rinsed with methanol, dried, capped on both ends, and stored in a tightly sealed plastic bag in the freezer at -20°C.
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What is the flow rate for Product 306312, Inhibitor removers - Prepacked column for removing hydroquinone and monomethyl ether hydroquinone?
1 answer-
According to the manufacturer of this inhibitor removal column, the maximum recommended flow rate is 4 bed volumes (approximately 120 mL) per hour.
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What is the Department of Transportation shipping information for this product?
1 answer-
Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product.
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