Dechlorination during pyrolysis of plastics: Effect of municipal plastic waste composition

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F44555601%3A13520%2F23%3A43898317" target="_blank" >RIV/44555601:13520/23:43898317 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0378382023001716#s0100" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0378382023001716#s0100</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.fuproc.2023.107823" target="_blank" >10.1016/j.fuproc.2023.107823</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Dechlorination during pyrolysis of plastics: Effect of municipal plastic waste composition

Popis výsledku v původním jazyce

In order to close the loop in chemical recycling via pyrolysis, products must meet strict limits for halogen content to be used in conventional petrochemical processes. By integrating dechlorination as an integral part of pyrolysis, results show that the efficiency of dechlorination, both via stepwise pyrolysis and dechlorination agents, is significantly decreased in the presence of PET or cellulose in the feedstock. Product analysis showed that Cl reacts with formed oxygenated substances, some of which remain in the reactor during the 1st step at 350 oC and subsequently pass into the final liquid product. This increases the requirements for applied dechlorinating agents during the 2nd pyrolysis step. Novel agents have to therefore cope with a wide range of chlorinated hydrocarbons. By combining acidic ?-zeolite with alkali hydrotalcite in a 1:1 ratio, a synergic effect towards dechlorination was observed, increasing individual efficiency by about 12% and 6%, respectively. Combining stepwise pyrolysis, which removed 38% of Cl on average, with the mentioned mixture of agents, 95% efficiency and 12.2 ? 1.2 ppm of Cl were obtained in the final liquid product. Such a level of dechlorination may be sufficient, considering that the pyrolysis liquid will be diluted in conventional petrochemical feedstocks.

Název v anglickém jazyce

Dechlorination during pyrolysis of plastics: Effect of municipal plastic waste composition

Popis výsledku anglicky

In order to close the loop in chemical recycling via pyrolysis, products must meet strict limits for halogen content to be used in conventional petrochemical processes. By integrating dechlorination as an integral part of pyrolysis, results show that the efficiency of dechlorination, both via stepwise pyrolysis and dechlorination agents, is significantly decreased in the presence of PET or cellulose in the feedstock. Product analysis showed that Cl reacts with formed oxygenated substances, some of which remain in the reactor during the 1st step at 350 oC and subsequently pass into the final liquid product. This increases the requirements for applied dechlorinating agents during the 2nd pyrolysis step. Novel agents have to therefore cope with a wide range of chlorinated hydrocarbons. By combining acidic ?-zeolite with alkali hydrotalcite in a 1:1 ratio, a synergic effect towards dechlorination was observed, increasing individual efficiency by about 12% and 6%, respectively. Combining stepwise pyrolysis, which removed 38% of Cl on average, with the mentioned mixture of agents, 95% efficiency and 12.2 ? 1.2 ppm of Cl were obtained in the final liquid product. Such a level of dechlorination may be sufficient, considering that the pyrolysis liquid will be diluted in conventional petrochemical feedstocks.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

10406 - Analytical chemistry

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Fuel Processing Technology

ISSN

0378-3820

e-ISSN

1873-7188

Svazek periodika

neuveden

Číslo periodika v rámci svazku

248

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

29

Strana od-do

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Kód UT WoS článku

001002383700001

EID výsledku v databázi Scopus

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