erformance assessment of regenerated methyl acetate in industrial enamel manufacturing with the ECO PLUS 122 UNIT

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🔬研究者:Chemical engineers and waste management researchers can learn about the regeneration efficiency and quality of recovered methyl acetate under varying contamination levels.

🏢実務担当者:Enamel manufacturers and solvent recovery plant operators can use these results to optimize solvent regeneration processes and reduce raw material costs.

🏛政策担当者:Environmental regulators may consider this as evidence for promoting solvent recycling in industrial sectors, reducing hazardous waste.

PERFORMANCE ASSESSMENT OF REGENERATED METHYL ACETATE IN INDUSTRIAL ENAMEL MANUFACTURING WITH THE ECO PLUS 122 UNIT © V.V. Marchenko1 , S.A. Naboka2 National Technical University “Kharkiv Polytechnic Institute”, 61002, Kharkiv, 2 Kirpichova St., Ukraine 1 Marchenko Viktor V., Postgraduate Student of the Department of Oil, Gas and Solid Fuel Processing Technologies (TPNG and TP), ORCID: 0009-0003-5287-5415, e-mail: [email protected] 2 Naboka Serhii A., Postgraduate Student of the TPNG and TP, ORCID: 0009-0005-3632-997X, e-mail: [email protected] This paper analyzes the technical feasibility of reusing regenerated methyl acetate to produce industrial enamel and evaluates contamination levels and its impact on the regeneration efficiency, the performance of physicochemical restorations and coating-films. The regeneration and reuse of organic solvents is also relevant for coke-chemical enterprises where significant volumes of solvent-containing waste streams are generated during the processing of coal-derived products and coating materials. Solvent was industrially degraded and the five different levels of contamination (MXL0-MXL4) were identified, and distinguished by the differences in the contents and the level of acidity, moisture, density, colour and non-volatile residue. The regeneration was done on the ECO PLUS 122 thermal-distillation unit under controlled working conditions which were adjusted to low boiling point and high pressure of methyl acetate. Feedstock and regenerated solvent (RMXL0-RMXL4) were subjected to measure the extent of purification, and enamel films prepared using regenerated solvent were tested in regards to gloss, hardness and drying behavior. The thermal behavior of the regeneration cycle showed a steady plateau of vapour-temperature at 55-60о C, which proved the selective evaporation of the ester. The form of regeneration yield decreased predictably with a 93 % being the highest and 81 % being the lowest regeneration yield in MXL0 and MXL4 respectively. Nevertheless, the recovered solvent had a great physicochemical recovery: ester content was between 98.4-99.3%, moisture content was below 500 ppm and acid value was not more than 0.11 mg KOH/g. Density, colour and non-volatile residue were close to those of normal industrial grade methyl acetate, implying the retention of hydrolysed and high-boiling impurities in the evaporator. The performance of the enamel-films was also consistent in all of the regenerated samples with the gloss not varying over 1-5 units, HB hardness not deviating over 1-2 and drying time within 39-45 min. These findings verify that regenerated methyl acetate has retained functional qualities necessary to enamel production despite the use of very contaminated feedstock. The results substantiate the technology and environmental-based reason of the use of solvent-regeneration systems like ECO PLUS 122 in the manufacturing coating industry. Keywords: coke chemical production; methyl acetate; solvent regeneration; physicochemical properties; distillation efficiency; coating film quality. Corresponding author: V.V. Marchenko, e-mail: [email protected] Manuscript received 2026/02/16 Accepted for publication 2026/03/30 Published 2026/04/17 How to Cite: 1. Marchenko V.V. Otsinka produktyvnosti rehenerovanoho metylatsetatu v promyslovomu vyrobnytstvi emalei za dopomohoiu ustanovky ECO PLUS 122 / V.V. Marchenko, S.A. Naboka // Vuhlekhimichnyi zhurnal. – 2026. – № 2. – S. 40-52. https://doi.org/10.31081/1681-309X-2026-0-2-40-52 2. Marchenko, V. V. & Naboka, S. A. (2026). Otsinka produktyvnosti rehenerovanoho metylatsetatu v promyslovomu vyrobnytstvi emalei za dopomohoiu ustanovky ECO PLUS 122. Vuhlekhimichnyi Zhurnal, (2), 40–52. https://doi.org/10.31081/1681-309X-2026-0-2-40-52 How to obtain the full text of the article: - within 2 years from the date of publication – upon request by e-mail: [email protected] - after 2 years from the date of publication – free access in the database “Scientific Periodicals of Ukraine” of the Vernadsky National Library of Ukraine by the link: http://www.irbis-nbuv.gov.ua/cgibin/irbis_nbuv/cgiirbis_64.exe?Z21ID=&I21DBN=UJRN&P21DBN=UJRN&S21STN=1&S21REF=10&S21FMT=juu_all&C21COM=S&S21CNR=20&S21P01=0&S21P02=0&S21P03=PREF=&S21COLORTERMS=0&S21STR=ukhj This article is licensed under a Creative Commons Attribution 4.0 International License https://creativecommons.org/licenses/by/4.0/ References 1. Elehinafe, F. B. (2021). 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