Chemical composition and stability of renewable hydrocarbon products generated from a hydropyrolysis vapor upgrading process

Abstract

The unique feature of a two-step ex situ hydropyrolysis vapor upgrading process for producing infrastructure-compatible cellulosic biofuels has been demonstrated for the first time using a double fluidized-bed reactor system.

Nuclear Magnetic Resonance Characterization of Renewable Products from a Two‐Step Ex‐Situ Hydropyrolysis Vapor Upgrading Process

“…Specifically, the cyclic ketone ( δ 13 C 220–230 ppm) vanishes around 400 °C while the aliphatic chain ketone ( δ 13 C 205–220 ppm) becomes extinct at 425 °C. This may be attributed to one or combination of the following possible reasons: 1) hydrodeoxygenation of cyclic ketone may go through a lower energy barrier than hydrodeoxygenation of aliphatic ketone, 2) cyclic ketones may form aliphatic ketones via ring opening at higher temperatures, and 3) the rearrangement of hydropyrolysis intermediates such as furfural to form cyclic ketones at higher temperatures is unfavorable …”

“…Specifically, the vapor upgrading temperatures chosen for tests were 350, 375, 400, and 425 °C. Detailed experimental setup and reaction conditions can be found in another publication …”

“…As anticipated, the higher vapor upgrading temperature resulted in lower oxygen contents as well as H/C ratio in the oxygenated hydrocarbon (OHC) products. A discussion on origin of the phenomena can be found in our previous paper . The oxygen contents for the products upgraded at 350, 375, 400, and 425 °C were 17.2, 10.4, 6.4, and 2.2 wt%, respectively.…”

“…In an associated paper, we reported a two‐step ex‐situ HPVU process that can generate products superior to pyrolysis oil . The configuration features operational flexibility; the hydropyrolysis and hydrodeoxygenation steps can be optimized separately for maximized liquid yield.…”

Efeito catalítico de zeólita ZSM-5 e ácido nióbico HY-340 na pirólise e hidropirólise de ligninas kraft industriais.

“…A Figura 2.10 apresenta diferentes processos para integração com uma unidade de hidropirólise. presença de hidrogênio promove a redução de oxigênio do bio-óleo até certa medida, não atingindo uma desoxigenação profunda(ZHANG et al, 2017). A adição de um catalisador adequado, in situ ou ex situ, é necessária para atingir um nível desejadode hidrodesoxigenação e rendimento líquido.…”