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248568

Sigma-Aldrich

Calcium oxide

reagent grade

Synonym(s):

Lime, Quicklime

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About This Item

Linear Formula:
CaO
CAS Number:
1305-78-8
Molecular Weight:
56.08
EC Number:
215-138-9
MDL number:
MFCD00010911
UNSPSC Code:
12352303
PubChem Substance ID:
329752750
NACRES:
NA.21

grade

reagent grade

Quality Level

200

form

powder

concentration

≥68.0% Ca (EDTA titration)

loss

10% loss on ignition, 1000°C (absorbed H2O and CO2)

pH

12.6 (20 °C)

bp

2850 °C (lit.)

density

3.3 g/mL at 25 °C (lit.)

SMILES string

O=[Ca]

InChI

1S/Ca.O

InChI key

ODINCKMPIJJUCX-UHFFFAOYSA-N

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General description

Calcium oxide (CaO) is an alkaline earth metal oxide that has many industrial applications. Calcium oxide receives great attention in catalysis because it is affordable, environmentally friendly, and characterized by a strong basic nature, abundantly available, low methanol solubility and non-toxic compound.

Application

Calcium oxide is used:
  • As a catalyst during the transesterification of palm oil to produce biodiesel.
  • In the inactivation of Cryptosporidium spp. oocysts and Giardia spp. Cysts from WTS (water treatment sludge).
  • In combination with PAA (peracetic acid) to increases the biogas production potential of cow manure and maize straw.

pictograms

CorrosionExclamation mark
GHS05,GHS07

signalword

Danger

Hazard Classifications

Eye Dam. 1 - Skin Irrit. 2 - STOT SE 3

target_organs

Respiratory system

Storage Class

13 - Non Combustible Solids

wgk_germany

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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Ryo Kubota et al.
Biological engineering transactions, 4(2), 69-80 (2011-01-01)
We report on the use of a non-instrumented device for the implementation of a loop-mediated amplification (LAMP) based assay for the select-agent bacterial-wilt pathogen
Calcium oxide as a solid base catalyst for transesterification of soybean oil and its application to biodiesel production.
Kouzu M, et al.
Fuel: The Science and Technology of Fuel and Energy, 87(12), 2798-2806 (2008)
Preparation of biodiesel catalyzed by solid super base of calcium oxide and its refining process.
Huaping ZHU, et al.
Chinese Journal of Catalysis, 27(5), 391-396 (2006)
Eagleson M.
Concise Encyclopedia Chemistry, 65-65 (1994)
María Nazaret González-Alcaraz et al.
Journal of environmental management, 116, 72-80 (2013-01-08)
The aim of this study was to identify the effectiveness of liming in combination with vegetation for the recovery of slightly acidic, saline soils of eutrophic wetlands affected by mine wastes, under fluctuating flooding conditions. Simulated soil profiles were constructed
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