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Calcium oxide

About: Calcium oxide is a research topic. Over the lifetime, 7600 publications have been published within this topic receiving 66104 citations. The topic is also known as: caustic lime & quicklime.


Papers
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Journal ArticleDOI
01 Mar 2022-Energy
TL;DR: In this paper , the use of clay/CaO heterogeneous catalyst for the production of biodiesel from waste cooking oil was investigated, where the catalyst was synthesized from clay and calcined using calcium oxide under controlled conditions.

19 citations

Patent
12 Jul 1974
TL;DR: A sintered catalyst article is prepared by molding into a shaped article and aging (I) either a refractory powder of calcium aluminate substantially free of silicon dioxide, alone, or B. a homogenous mixture of 1.5 and 2.5 oxides as discussed by the authors.
Abstract: A sintered catalyst article is prepared by: molding into a shaped article and aging (I) either A. a refractory powder of calcium aluminate substantially free of silicon dioxide, alone, or B. a homogenous mixture of 1. said refractory powder and 2. at least one member selected from the group consisting of aluminum oxide, calcium oxide, beryllium oxide, magnesium oxide, strontium oxide and a compound which is converted by heating to one of said oxides; (II) sintering said molded and aged article at a temperature above 1150°C; the thus sintered catalyst article containing 10 to 60 wt. percent of calcium oxide, 30 to 90 wt. percent of aluminum oxide, 0 to 30 wt. percent of at least one oxide selected from the group consisting of beryllium oxide, magnesium oxide and strontium oxide, and less than 0.2 wt. percent of silicon dioxide.

19 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of catalyst type and concentration on the production of alkyd resins using castor seed oil (CSO) was evaluated, and the results showed that the reaction time was fastest in LiOH followed by PbO, CaCO3,======NaOH and CaO catalyst.
Abstract: Significant scientific and economic benefits may be derived from investigating the best choice of catalyst in the alkyd resin synthesis. The effect of catalyst type and concentration on the production of alkyd resin using castor seed oil (CSO) was evaluated. Lithium hydroxide, lead (II) oxide, calcium carbonate, sodium hydroxide and calcium oxide were investigated. The fatty acid profile of the raw CSO was determined using GC-MS while structural elucidation of the CSO based alkyd resins was determined using FTIR spectrometry. The CSO modified alkyd resin produced has acid values of 5.0, 5.61, 7.0 8.24 and 11 for lithium hydroxide, lead (II) oxide, calcium carbonate, sodium hydroxide and calcium oxide respectively. The extent of reaction was 95%, 95%, 91%, 89% and 88% for lithium hydroxide, lead (II) oxide, calcium carbonate, sodium hydroxide and calcium oxide respectively at the reaction time of 150 minutes. The alcoholysis reaction completion time was fastest in LiOH followed by PbO, CaCO3, NaOH and CaO catalyst. Physico-chemical parameters of the oil and performance evaluation of the alkyd films suggest that they are sustainable materials for surface coating. LiOH shows excellent robustness to expanded process parameters.

19 citations

Patent
22 Aug 1975
TL;DR: In this paper, an improved process and apparatus for the removal of sulphur dioxide from flue gas or other waste gas of the kind in which the waste gas is scrubbed by a circulating wash liquid containing lime suspensions, i.e. suspensions of calcium oxide, hydroxide or carbonate, the calcium/sulphur compounds so formed being oxidized and removed from the circulation.
Abstract: The invention is concerned with improved process and apparatus for the removal of sulphur dioxide from flue gas or other waste gas of the kind in which the waste gas is scrubbed by a circulating wash liquid containing lime suspensions, i.e. suspensions of calcium oxide, hydroxide or carbonate, the calcium/sulphur compounds so formed being oxidized and removed from the circulation, the improvements of the present invention comprising primarily the freeing of the wash liquid from solid matter before contact with the waste gas and then the control of pH values of the wash liquid at different stages of the circulation to facilitate, for example, the oxidation of the particular calcium/sulphur compound, formed in the scrubbing process, to calcium sulphate, the apparatus also being designed to improve the oxidation step.

19 citations

Journal ArticleDOI
TL;DR: In this paper, the reaction between sulfur dioxide and calcium oxide, pertaining to atmospheric fluidized bed combustion, was investigated using thermogravimetric analysis, IR spectroscopy and X-ray powder diffraction, at 600-900 °C and with SO2 concentrations of 0.1-0.9% in N2.

19 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023101
2022186
2021116
2020234
2019350
2018432