Co-cracking of bio-oil distillate bottoms with vacuum gas oil for enhanced production of light compounds

被引:12
作者
Choi, Yong S. [1 ]
Elkasabi, Yaseen [1 ]
Tarves, Paul C. [1 ]
Mullen, Charles A. [1 ]
Boateng, Akwasi A. [1 ]
机构
[1] ARS, USDA, Eastern Reg Res Ctr, 600 E Mermaid Lane, Wyndmoor, PA 19038 USA
关键词
Fast pyrolysis; Bio-oil; Residues; Coprocessing; Cracking; Delayed coking; CATALYTIC FAST PYROLYSIS; REACTIVE PYROLYSIS; BIOMASS; CELLULOSE; PLASTICS; BIOFUELS;
D O I
10.1016/j.jaap.2018.03.014
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Seamless co-processing of pyrolysis bio-oil within existing petroleum refineries is the most synergistic and economic way to improve biorefinery output. Coprocessing bio-oil with vacuum gas oil (VGO) is one logical pathway. Bio-oil has a viscosity and molecular weight range similar to that of VGO, and the hydrogen-rich nature of VGO can chemically complement the bio-oil hydrogen deficiency. Distillation of biomass pyrolysis oils produces solid residues with a significant fraction of fixed carbon and heavy volatiles. Maximization of yields of light compounds like olefins and gasoline-range aromatics are crucial for both attainment of desired product output levels as well as to follow methods that mimic petroleum-based methods and chemistries. Herein we discuss a systematic study on the additive coprocessing of specific bio-oil distillation bottoms with VGO. Tail-gas reactive pyrolysis (TGRP) bio-oils from spirulina, switchgrass, and guayule biomasses were distilled, and their bottoms were subject to analytical experiments in mixtures with VGO over different zeolite catalysts (no catalyst, HZSM-5, Y-zeolite). Switchgrass-based bottoms exhibit greater hydrogen deficiency and higher oxygen content compared with that of spirulina or guayule. Switchgrass-based bottoms, with or without VGO, produced more aromatics and less olefins and alkanes, compared with spirulina or guayule bottoms. When compared across different mixing ratios, thermal cracking of a 10:1 guayule/VGO mixture resulted in higher aromatics yields than even the VGO by itself. Addition of more VGO up to a 1:1 ratio of VGO/switchgrass bottoms nearly tripled the production of BTEX compounds. For hydrogen-rich bottoms spirulina and guayule, LPG-range olefins yields increased nearly 50% for 1:1 VGO/bottoms blends, compared with theoretical yields.
引用
收藏
页码:65 / 71
页数:7
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