Preparation and esterification performance of sulfonated coal-based heterogeneous acid catalyst for methyl oleate production

Yu, Hewei; Niu, Shengli; Lu, Chunmei; Li, Jing; Yang, Yanzhao

doi:10.1016/j.enconman.2016.08.036

Cited by 73 publications

(28 citation statements)

References 45 publications

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“…These sodium-induced issues severely limit the utilization of coals that have a relatively high concentration of sodium, such as the Zhundong coal which can potentially serve as the main energy source for China for the next 100 years [9][10][11]. To enable clean utilization of the Zhundong coal requires better understanding on the sodium-release characteristics during the coal combustion process [12].…”

Section: Introductionmentioning

confidence: 99%

In Situ Measurements of the Release Characteristics and Catalytic Effects of Different Chemical Forms of Sodium during Combustion of Zhundong Coal

et al. 2018

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This work studies the temporal release characteristics of different chemical forms of sodium during the combustion of Zhundong coal and the catalytic effects of sodium on the combustion process via target-sodium removal and enrichment approaches. The target-sodium removal approach extracts specific forms of sodium from the raw coal via a chemical method to produce coal samples with designated characteristics. In the target-sodium enrichment approach, three kinds of H2O-soluble sodium compounds, including NaCl, NaOH and Na2SO4, are manually added into the raw coal. The experimental measurement is conducted using a multi-point Laser-Induced Breakdown Spectroscopy (LIBS) system. The system quantitatively measures the temporal release flux of sodium during the combustion process, and performs the in-situ measurement of surface temperature and diameter of a burning coal pellet. It is found that H2O-soluble sodium is the major chemical form of sodium released during the combustion and exhibits the highest volatility. All the three forms of enriched H2O-soluble sodium compounds show a catalytic effect on the coal combustion (burnout time decreased by more than 5.7%) and the catalytic activity of NaOH is found to be the strongest (burnout time decreased by 36.8%).

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Section: Introductionmentioning

confidence: 99%

In Situ Measurements of the Release Characteristics and Catalytic Effects of Different Chemical Forms of Sodium during Combustion of Zhundong Coal

et al. 2018

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“…Oleate. NMR 1 H spectroscopy is an e ective and simple method for quick detection of methyl oleate yields [29][30][31][32]. Generally, TMS is used as the internal standard marker for 0 point, and CDCl 3 is used as the solvent.…”

Section: Yield Analysis Of Methylmentioning

confidence: 99%

Efficient Production of Methyl Oleate Using a Biomass-Based Solid Polymeric Catalyst with High Acid Density

Wang

Zhang

et al. 2019

Advances in Polymer Technology

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Biomass-based polymers are eco-friendly, nontoxic and biodegradable materials. In this work, in order to prepare green, low-cost and high-efficient catalysts under mild conditions, we chose biomass-based chitosan as raw material and prepared a new solid acidic catalyst by an acid functionalization method. FT-IR, XRD, SEM, TGA, BET, neutralization titration and other analytical methods were used to characterize the catalyst. The results showed that CS-SO3H morphology exhibited a sphere of about 10 μm diameter, and the acid density was as high as 3.81 mmol/g. The catalyst exhibits good catalytic activity in the esterification of oleic acid and methanol, which is a model reaction of the pre-esterification process in the preparation of biodiesel from feedstocks with high acid values. Under the optimum reaction conditions (15/1 methanol/oleic acid mole ratio and 3 wt% catalyst dosage at 75°C for 3 h), the yield of methyl oleate can reach 95.7%. Even if the mass of oleic acid in the reactant increased to 20 g, solid acid showed good catalytic performance, and the yield of methyl oleate was 94.4%. After four times of reuse, the yield of the catalyst can still reach 85.7%, which indicates that the catalyst has good catalytic activity and stability, and has potential application prospects.

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“…Usually, the catalyst of esterification (acetic acid and isopentanol) was concentrated H 2 SO 4 in industry, and the expensive alloy materials had to strengthen the acid-stability of the esterification apparatus, which would increase the production costs of ester greatly. Over the past few years, sulfamic acid, heteropoly acid and rare-earth solid superacid were desired as replacements for concentrated H 2 SO 4 as the catalysts in esterification, but most of them have tedious preparation procedures, low esterification yields and complicated post-processing (Kiss and Keglevich, 2016;Tejero et al, 2016;Yu et al, 2016). NaHSO 4 is a novel and green catalyst for esterification, for example, esterification of the chloroacetic acid and isoamyl alcohol with NaHSO 4, the yield of isoamyl chloroacetate was up to 98.45% .…”

Section: E Ect Of Catalystmentioning

confidence: 99%

Preparation of Isoamyl Acetate by High Performance ZSM-5 Zeolite Membrane

Xue

Zhu

Zhong

et al. 2019

J. Chem. Eng. Japan

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A high performance ZSM-5 zeolite membrane is applied to remove H 2 O from the esteri cation of acetic acid and isopentanol by pervaporation. The in uences of reaction conditions on the isoamyl acetate yield are studied in detail. Compared with the traditional esteri cation of acetic acid and isopentanol, the esteri cation with "membrane extractor" has a well isoamyl acetate yield at low reaction temperature. With the reaction temperature, acetic acid/isopentanol molar ratio and e ective membrane surface area to esteri cation mixture ratio volume of 100°C, 3.0/1.0, 2.0 wt% NaHSO 4 , and 0.26 cm 2 /cm 3 , respectively, the isoamyl acetate yields was 98.39%, the membrane ux and separation factor (H 2 O to organic) were 0.21 kg·m 2 ·h 1 and 1040, respectively. Further, the ZSM-5 zeolite membrane shows good long-term stability and reproducibility for the pervaporation-esteri cation, the isoamyl acetate yields of the esteri cation-pervaporation for intermittent 8 times or continuous 160 h still remained at 97.73% and 98.30%, respectively. In addition, the ZSM-5 zeolite membrane still retained the typical MFI di raction peaks and morphology by XRD and SEM characterization after long-term PV-esteri cation .

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Preparation and esterification performance of sulfonated coal-based heterogeneous acid catalyst for methyl oleate production

Cited by 73 publications

References 45 publications

In Situ Measurements of the Release Characteristics and Catalytic Effects of Different Chemical Forms of Sodium during Combustion of Zhundong Coal

In Situ Measurements of the Release Characteristics and Catalytic Effects of Different Chemical Forms of Sodium during Combustion of Zhundong Coal

Efficient Production of Methyl Oleate Using a Biomass-Based Solid Polymeric Catalyst with High Acid Density

Preparation of Isoamyl Acetate by High Performance ZSM-5 Zeolite Membrane

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