scholarly journals Total acid number reduction kinetics of naphthenic acids using non-catalytic subcritical methanol

2017 ◽  
Author(s):  
Faisal Zafar ◽  
Pradip Chandra Mandal ◽  
Ku Zilati bt Ku Shaari ◽  
Saad Nadeem
Keyword(s):  
Naphthenic Acids ◽  
Acid Number ◽  
Reduction Kinetics ◽  
Total Acid ◽  
Total Acid Number ◽  
Kinetics Of

Role of Naphthenic Acids in Emulsion Tightness for a Low-Total-Acid-Number (TAN)/High-Asphaltenes Oil†

2009 ◽  
Vol 23 (3) ◽  
pp. 1269-1279 ◽  
Author(s):  
Vincent Pauchard ◽  
Johan Sjöblom ◽  
Sunil Kokal ◽  
Patrick Bouriat ◽  
Christophe Dicharry ◽  
...  
Keyword(s):  
Naphthenic Acids ◽  
Acid Number ◽  
Total Acid ◽  
Total Acid Number

scholarly journals EXTRACTION OF NAPHTHENIC ACIDS FROM ACIDIC PETROLEUM CRUDE OIL UTILIZING 2-METHYLIMIDAZOLE WITH THE AID OF Ca/Al2O3 AND Ce/Al2O3 CATALYSTS

2019 ◽  
Vol 7 (SI-TeMIC18) ◽  
Author(s):  
Norshahidatul Akmar Shohaimi ◽  
Wan Azelee Wan Abu Bakar ◽  
Nurasmat Mohd Shukri ◽  
Khairan Shaidi
Keyword(s):  
Crude Oil ◽  
Reaction Times ◽  
Naphthenic Acids ◽  
Acid Number ◽  
Catalyst Loading ◽  
Total Acid ◽  
Characterization Methods ◽  
Oil Refineries ◽  
Total Acid Number ◽  
Al2o3 Catalyst

Naphthenic acids (NAs) is one of the major sources of corrosion in oil pipelines and distillation units in crude oil refineries. Removing NA compounds from crude oils is regarded as one of the most crucial processes in heavy oil upgrading. Catalytic deacidification method had been developed in order to reduce the total acid number values in crude oil. Crude oil from Petronas Penapisan Melaka had been chosen to be studied with original total acid number (TAN) of 2.43 mg KOH/g. The parameters used were different catalyst calcination temperatures, catalyst loading, reagent concentration, reaction times and reaction temperature. Acid removal agent of 2-methylimidazole in ethanol and monometallic calcium and cerium doped with alumina were used as a catalyst. The results showed that with the aid of catalyst, the TAN can be reduced to lower than 1 mg KOH/g. Catalyst of Ca/Al2O3 calcined at 900oC gave a better reduction than Ce/Al2O3 with 83.54% of TAN reduction (2.43 to 0.4) for Ca/Al2O3 catalyst and 71.19% (2.43 to 0.7) for Ce/Al2O3 catalyst. The best catalyst underwent several characterization methods such as X-Ray Diffraction Spectroscopy (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Thermogravimetry Analysis (TGA-DTA) for its physicochemical properties. It can be concluded that catalytic deacidification method was effective in extracting NAs from the crude oil thus lowered the TAN value to less than 1 mg KOH/g. Keywords: Naphthenic acids; Crude oil; Catalysts

scholarly journals Kinetics and reaction pathways of total acid number reduction of cyclopentane carboxylic acid using subcritical methanol

2016 ◽  
Vol 18 (3) ◽  
pp. 44-49 ◽  
Author(s):  
Pradip C. Mandal ◽  
Thasvinya Nagarajan
Keyword(s):  
Carboxylic Acid ◽  
Reaction Times ◽  
Naphthenic Acids ◽  
Acid Number ◽  
Reaction Products ◽  
Total Acid ◽  
Exponential Factor ◽  
First Order Kinetics ◽  
Total Acid Number ◽  
New Compounds

Abstract Cyclopentane carboxylic acid (CPCA) is a model compound of Naphthenic acids (NAs). This objective of this paper is to discover total acid number (TAN) reduction kinetics and pathways of the reaction between CAPA and subcritical methanol (SubC-MeOH). The experiments were carried out in an autoclave reactor at temperatures of 180-220°C, a methanol partial pressure (MPP) of 3 MPa, reaction times of 0-30 min and CPCA initial gas phase concentrations of 0.016-0.04 g/mL. TAN content of the samples were analyzed using ASTM D 974 techniques. The reaction products were identified and quantified with the help of GC/MS and GC-FID respectively. Experimental results reveal that TAN removal kinetics followed first order kinetics with an activation energy of 13.97 kcal/mol and a pre-exponential factor of 174.21 s-1. Subcritical methanol is able to reduce TAN of CPCA decomposing CPCA into new compounds such as cyclopentane, formaldehyde, methyl acetate and 3-pentanol.

Catalytic removal of naphthenic acids over Co-Mo/γ-Al2O3 catalyst to reduce total acid number (TAN) of highly acidic crude oil

2020 ◽  
Vol 606 ◽  
pp. 117835
Author(s):  
Kanghee Cho ◽  
Bharat Singh Rana ◽  
Dong-Woo Cho ◽  
Hee Tae Beum ◽  
Cheol-Hyun Kim ◽  
...  
Keyword(s):  
Crude Oil ◽  
Naphthenic Acids ◽  
Acid Number ◽  
Total Acid ◽  
Total Acid Number ◽  
Catalytic Removal ◽  
Al2o3 Catalyst
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