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Integration of Solvent Extraction and Non-Catalytic Esterification for the Treatment of Acidic Feedstocks
- Source :
- CONICET Digital (CONICET), Consejo Nacional de Investigaciones Científicas y Técnicas, instacron:CONICET
- Publication Year :
- 2020
- Publisher :
- American Chemical Society, 2020.
-
Abstract
- The possibility of directly feeding the extract of a liquid-liquid extraction unit to a chemical reactor is analyzed. An example of extraction and noncatalytic esterification of naphthenic acids from acid petroleum crudes is used. Methanol is used both as a solvent and as a reactant. Separate tests of extraction and reaction are performed, and the performance of an integrated process is deduced by computer simulation. Thermodynamic and kinetic parameters for the extraction of naphthenic acids from an acid crude were determined. A partition coefficient of m = 0.66 at 60 °C between the alcoholic and petroleum phases was found. Three successive batch extractions with a 1:1 v/v ratio reduced the acidity from 4.3 to about 1.1 mgKOH g-1. Naphthenic acid concentrates were reacted with supercritical methanol in a batch reactor at high temperatures (280 °C), yielding naphthenic esters. Reaction of 1-2 h with methanol-to-oil molar ratios of 3-6 yielded 92-96% conversion because of a relatively low value of the equilibrium constant. Total conversion could, however, be achieved with the highly diluted extracts. Simulations were run using three countercurrent mixer-settlers and a noncatalytic reactor. The results indicated that extraction/supercritical esterification is a convenient pretreatment step of acidic feedstocks because of its simplicity, the good quality of the deacidified feedstock (acidity
- Subjects :
- EXTRACTION
Chromatography
General Chemical Engineering
Batch reactor
Extraction (chemistry)
SUPERCRITICAL TRANSESTERIFICATION
Energy Engineering and Power Technology
02 engineering and technology
Chemical reactor
021001 nanoscience & nanotechnology
Supercritical fluid
Solvent
Partition coefficient
chemistry.chemical_compound
purl.org/becyt/ford/2.4 [https]
Fuel Technology
020401 chemical engineering
chemistry
purl.org/becyt/ford/2 [https]
Naphthenic acid
Methanol
0204 chemical engineering
0210 nano-technology
ACID CRUDES
DEACIDIFICATION
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- CONICET Digital (CONICET), Consejo Nacional de Investigaciones Científicas y Técnicas, instacron:CONICET
- Accession number :
- edsair.doi.dedup.....24a3937e03f4b796d0c14c5d8d0d0ec6
- Full Text :
- https://doi.org/10.1021/acs.energyfuels.9b04258