18514

Kieselguhr

calcined, purified

• Synonym(s): Infusorial earth
• CAS Number: 91053-39-3
• MDL number: MFCD00132803
• UNSPSC Code: 12000000
• PubChem Substance ID: 57647665

Properties

• form: powder
• quality: calcined, purified
• greener alternative product characteristics: Catalysis; Learn more about the Principles of Green Chemistry.
• impurities: ≤1% HCl solubles
• loss: ≤1% loss on ignition
• anion traces: chloride (Cl^-): ≤200 mg/kg; sulfate (SO₄^2-): ≤500 mg/kg
• cation traces: Fe: ≤500 mg/kg
• greener alternative category: Aligned
• SMILES string: O=[Si]=O
• InChI: 1S/O2Si/c1-3-2
• InChI key: VYPSYNLAJGMNEJ-UHFFFAOYSA-N

Description

General description

Kieselguhr (diatomite, infusorial earth) is the fossilized skeletons of diatom algae. It is mainly made up of silica with many unique features like high porosity, small particle size, low density and thermal conductivity. It is primarily utilized as a source to manufacture filter aids, fire-bricks and adsorbents.[1] Kieselguhr is the main component of the Berkefeld filter used for purifying water.[2] It is also utilized in the filtration process of beer brewing.[3]

We are committed to bringing you Greener Alternative Products, which adhere to one or more of The 12 Principles of Greener Chemistry. This product has been enhanced for catalysis. Find details here.

Application

Kieselguhr (infusorial earth) may be used in the following processes:

• Estimation of total fats.[4]
• As a catalyst in the synthesis of ketones and aldehydes via oxidation of corresponding oximes with manganese dioxide.[5]
• Green synthesis of β-nitroalkenes via Michael addition of 1,3-dicarbonyl compounds, by a grinding method in the absence of solvent and catalyst.[6]
• Preparation of KMnO₄-kieselguhr reagent for use in the oxidation of primary alcohols to aldehydes with shorter reaction time.[7]

Used for greener amide bond formation from amines and carboxylic acids after thermal activation at high temperature.

Clean, reusable and low cost heterogeneous catalyst for amide synthesis

Safety Information

• Pictograms: GHS08
• Signal Word: Danger
• Hazard Statements: H372
• Precautionary Statements: P260 - P264 - P270 - P314 - P501
• Hazard Classifications: STOT RE 1 Inhalation
• Target Organs: Lungs
• Storage Class Code: 6.1C - Combustible acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects
• WGK: nwg
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable
• Personal Protective Equipment: dust mask type N95 (US), Eyeshields, Gloves