Hydrolysis of acetic anhydride: Non-adiabatic calorimetric determination of kinetics and heat exchange

Hirota, Wilson H.; Rodrigues, Rodolfo B.; Sayer, Cláudia; Giudici, Reinaldo

doi:10.1016/j.ces.2010.03.028

Cited by 30 publications

(26 citation statements)

References 28 publications

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“…10 -4 L mol -1 s -1 for [20], k(40°C)= 2.85 . 10 -5 L mol -1 s -1 for [23] and k(40°C)= 6.60 . 10 -5 L mol -1 s -1 for [22].…”

Section: *Determination Of the Heat Loss Qlossmentioning

confidence: 97%

“…Zogg et al [25] proposed a first order reaction rate with respect to acetic anhydride and did not take into account the autocatalytic effect, neither the catalytic effect of hydrochloric acid. The kinetic constants for the noncatalytic phenomenon estimated in this work can be compared with the ones obtained from References [20], [22] and [23] by keeping in mind that in these references the autocatalytic effect was not taken into account.…”

Section: *Determination Of the Heat Loss Qlossmentioning

confidence: 97%

“…-Wiseman [21] used pH as an online analytical method but he did not include the energy balance, -Susanne et al [22] used NMR as an online method but they did not include energy balance, -Hirota et al [23] have used the temperature to make the kinetic estimation without taking into account the autocatalytic effect of the reaction, -Zogg et al [24,25] studied this reaction by combining calorimetric and IR techniques, but they assumed a first order reaction, -Gomez Garcia et al [26] used this reaction as an example for thermal stability, -Asiedu et al [27] studied this reaction under adiabatic mode but with a first order approach. This reaction is known to be autocatalytic due to the dissociation of the product acetic acid.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Kinetic modeling using temperature as an on-line measurement: Application to the hydrolysis of acetic anhydride, a revisited kinetic model

et al. 2019

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“…10 -4 L mol -1 s -1 for [20], k(40°C)= 2.85 . 10 -5 L mol -1 s -1 for [23] and k(40°C)= 6.60 . 10 -5 L mol -1 s -1 for [22].…”

Section: *Determination Of the Heat Loss Qlossmentioning

confidence: 97%

Section: *Determination Of the Heat Loss Qlossmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Kinetic modeling using temperature as an on-line measurement: Application to the hydrolysis of acetic anhydride, a revisited kinetic model

et al. 2019

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“…Data kinetik dapat dijadikan penilaian akurat dalam penggunaan metodelogi hidrolisis (Amenaghawon et al, 2013), orde reaksi, dan parameter yang mempengaruhi reaksi, seperti suhu, konsentrasi reaktan, dan katalis (Hirota et al, 2010). Hidrolisis VCO dengan konsentrasi reaktan VCO:air 1:12, suhu 80°C, dan katalis HCl 1% efektif mengubah asam lemak dalam VCO menjadi asam lemak bebas sebesar 88%.…”

Section: Suhu Reaksi 1/t (K -1 )unclassified

Kinetika Reaksi Hidrolisis Virgin Coconut Oil dengan Katalis Asam Klorida / Reaction Kinetics of the Hydrolysis of Virgin Coconut Oil using Hydrochloride Acid as Catalyst

Trivana¹,

Karouw²

2017

Bull. Palma

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ABSTRAKHidrolisis dapat berjalan baik apabila menggunakan data kinetika yang tepat untuk mendapatkan produk yang diinginkan. Penelitian ini dilaksanakan di Laboratorium Pengolahan Hasil, Balai Penelitian Tanaman Palma pada bulan Juni-Juli 2015. Penelitian bertujuan menentukan kondisi optimum hidrolisis Virgin Coconut Oil (VCO) secara kimiawi dengan katalis HCl dan mendapatkan data kinetika reaksi, yaitu konstanta kecepatan reaksi (k), energi aktivasi (Ea), dan rumusan persamaan kinetika reaksi. Hidrolisis VCO dilakukan 2 tahap, yaitu tahap pertama penentuan rasio VCO:air (1:3; 1:6; 1:9; dan 1:12) dipilih yang menghasilkan kadar ALB terbesar, dilanjutkan pada tahap kedua, yaitu penentuan suhu reaksi (60°C, 70°C, dan 80°C). Penentuan kondisi optimum berdasarkan kadar asam lemak bebas yang dihasilkan dan nilai konstanta kecepatan reaksi. Kadar asam lemak bebas ditentukan dengan titrasi asam-basa, sedangkan konstanta kecepatan reaksi menggunakan rumus persamaan kecepatan reaksi -ln(1-XA)=kt. Hidrolisis VCO menggunakan rasio VCO:air (1:12) menghasilkan kadar asam lemak bebas (ALB) yang lebih tinggi (0,11%), selanjutnya digunakan untuk penentuan suhu optimum hidrolisis. Suhu hidrolisis optimum adalah 80°C dengan kadar ALB sebesar 0,14%, konversi reaksi 0,88 dan konstanta kecepatan reaksi 0,27 jam -1 . Konsentrasi air dan suhu reaksi berpengaruh terhadap kadar ALB, konversi reaksi, dan konstanta kecepatan reaksi. Hidrolisis VCO dengan katalis HCl 1% terbaik pada rasio VCO:air 1:12, suhu reaksi 80°C selama 8 jam. Hubungan konstanta kecepatan reaksi dengan suhu reaksi mengikuti persamaan Arrhenius k = 1,62 x 10 15 e -25831/RT. Asam lemak bebas dan gliserol hasil hidrolisis banyak digunakan sebagai bahan baku dalam industri deterjen, kosmetik, surfaktan, dan obat-obatan. ABSTRACTAn accurate kinetic data has been considered as main substance in hydrolysis reaction. This research was conducted at the laboratory of processing of Indonesian Palm Crops Research Institute (IPRI) during June-July 2015. The objective of the research was to obtain the optimum condition of hydrolysis of VCO and the data of reaction kinetics (the reaction rate constant (k), the activation energy (Ea), and the reaction kinetics equation). Virgin coconut oil hydrolysis was done in two stages, the first step was the determination of the ratio of VCO:water (1:3; 1:6; 1:9; 1:12), the second step was the evaluation of reaction temperatures (60°C, 70°C, and 80°C). The determination of the optimum condition was based on the result of free fatty acid content and the values of the reaction rate constant. The free fatty acid content was measured by acid-base titration, meanwhile the reaction rate constant was determined by the equation -ln(1-XA)=kt. The results showed that the hydrolysis of VCO using ratio of VCO:water 1:12 produced higher content of FFA (0.11%) compared than others. The ratio of VCO:water 1:12 was then used to obtain the optimum temperature of hydrolysis. The optimum temperature of hydrolysis was 80°C with 0.14% of FFA, the reaction conversi...

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“…In this present work, the seventh of a series in this same journal, special attention was given to the importance of the C/O ratio and to the presence of double bonds in a new such monomer family: anhydrides . Potentially hydrolyzable into two carboxylic acids, molecules in this family of precursors have already been used to deposit thin films by LP and AP plasmas, coatings that are both sensitive to hydrolysis as well as biocompatible . The shapes of the Δ E g and E m curves for each different molecule as a function of F d will be discussed and correlated with deposition rates and chemical compositions of the resulting PP coatings.…”

Section: Introductionmentioning

confidence: 99%

Energetics of reactions in a dielectric barrier discharge with argon carrier gas: VII anhydrides

Mertens

Watson

Nisol

et al. 2019

Plasma Processes & Polymers

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Funding informationRégion Wallonne (FLYCOAT project n°131847) and the Fédération Wallonie Bruxelles (Belgium); Natural Sciences and Engineering Research Council of Canada (NSERC); Fonds de recherche du Quebec -Nature et technologies (FRQNT) The method developed for fundamental understanding of energetic exchanges between monomer molecules and argon carrier gas in a dielectric barrier discharge (DBD) has previously proven merit. In this seventh article related to this methodology, research has been extended to a new family of precursors: anhydrides.Monomers (typically ‰) were mixed with 10 slm of Ar in a 20 kHz, 8 kV (peak-topeak) DBD corresponding to an energy per cycle of 1600 μJ for pure Ar. For each of the investigated monomers E m , the energy absorbed per molecule was plotted as a function of precursor flow rate. The influence of chemical structure (C/O ratio, unsaturation) has been investigated and compared with previous data for other types of precursors. Thin plasma polymer coatings were deposited; in addition to measuring deposition rates, we also present relationships between E m values, spectro-ellipsometric and FTIR measurements. K E Y W O R D Sanhydride, atmospheric pressure, dielectric barrier discharge, energy exchange, polymerization mechanism

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Hydrolysis of acetic anhydride: Non-adiabatic calorimetric determination of kinetics and heat exchange

Cited by 30 publications

References 28 publications

Kinetic modeling using temperature as an on-line measurement: Application to the hydrolysis of acetic anhydride, a revisited kinetic model

Kinetic modeling using temperature as an on-line measurement: Application to the hydrolysis of acetic anhydride, a revisited kinetic model

Kinetika Reaksi Hidrolisis Virgin Coconut Oil dengan Katalis Asam Klorida / Reaction Kinetics of the Hydrolysis of Virgin Coconut Oil using Hydrochloride Acid as Catalyst

Energetics of reactions in a dielectric barrier discharge with argon carrier gas: VII anhydrides

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