Soybean soapstock(SS) is one of the main solid wastes produced in the refinery of edible oil processing. In this study, the co-pyrolysis of SS with iron slag(IS) and aluminum scrap(AS) was carried out in a tubular fur...Soybean soapstock(SS) is one of the main solid wastes produced in the refinery of edible oil processing. In this study, the co-pyrolysis of SS with iron slag(IS) and aluminum scrap(AS) was carried out in a tubular furnace. The gas, liquid and solid products were characterized and the char yield decreased with increasing IS/AS ratio. IS and AS can improve the gas yield, and when the ratio of SS/IS was 1:0.25, the total pyrolysis gas and hydrogen contents were significantly increased. The content of oxygen compounds in pyrolysis oil decreased during co-pyrolysis, while AS promoted the content of polycyclic aromatic hydrocarbons in pyrolysis oil. The co-pyrolysis reaction can be divided into four stages, the mass loss rate reaches the maximum at the third stage(390–575 ℃). The molar ratio of H/C was lower for pyrolysis,indicating good stability of pyrolysis char owing to the high degree of carbonization and aromaticity.The possible co-pyrolysis reaction mechanism was explored.展开更多
Scrap tires were pyrolyzed in a continuously stirred batch reactor in the presence and absence of catalysts. The maximum yield of derived oil was up to 55.65 wt%at the optimum temperature, 500 °C. The catalytic p...Scrap tires were pyrolyzed in a continuously stirred batch reactor in the presence and absence of catalysts. The maximum yield of derived oil was up to 55.65 wt%at the optimum temperature, 500 °C. The catalytic pyrolysis was performed using 1.0 wt%（on a scrap tire weight basis） of catalysts based on ZSM‐5, USY,β, SAPO‐11, and ZSM‐22. The oil products were characterized using simula‐tion distillation, elemental analysis, and gas chromatography‐mass spectrometry. The results show that using a catalyst can increase the conversion of scrap tires to gas and decrease char by‐products;the yield of derived oil remains unchanged or a little lower. The oils derived from catalytic pyrolysis had H/C ratios of 1.55–1.65 and contained approximately 70–75 wt%light oil, 0.3–0.58 wt%S and 0.78–1.0 wt%N. Catalysts with high acid strengths and appropriate pore sizes, such as ZSM‐5, USY,β, and SAPO‐11, increased the amount of single‐ring aromatics in the light‐middle‐fraction oil to 45 wt%. The derived oil can therefore be used as a petrochemical feedstock for producing high‐value‐added chemical products or fuel oil.展开更多
For disposal of scrap tyres,there have been a lot of studies done by previous researchers,but it yet remains a longstanding challenge in practice.To find a solution for this problem,the feasibility of a proposed appro...For disposal of scrap tyres,there have been a lot of studies done by previous researchers,but it yet remains a longstanding challenge in practice.To find a solution for this problem,the feasibility of a proposed approach in a laboratory scale was tested.The pyrolysis of scrap tyres pretreated by waste coal tar(noted as "as-pretreated" tyres)was performed in a batch reactor at atmospheric pressure.Waste coal tar was used to modify the scrap tyres to improve the pyrolysis efficiency of scrap tyres input and the quality of the product tar.The swelling behavior of scrap tyres soaked in waste coal tar at 10℃,effect of pyrolysis temperature on the product yields,and the synergies during pyrolysis of the as-pretreated tyres and co-pyrolysis of scrap tyres/waste coal tar mixture were all investigated in detail.The results observed found that by comparison of the calculated yields and the observed experimental yields for pyrolysis products,the synergy from co-pyrolysis of scrap tyres/waste coal tar mixture boosted the gas yield without increasing the tar yield.In contrast,the synergy during pyrolysis of the as-pretreated tyres could enhance the tar yield,but reduced the gas and char yields.According to the distillation range analyses of the tar,more light fractions were found in the tar from pyrolysis of the as-pretreated tyres,in which the gasoline fraction,diesel fraction and kerosene fraction were 38.4 wt%,46.8 wt%and 50.2 wt%,respectively.This work is expected to be helpful in further use of scrap tyres.展开更多
研究了废轮胎在回转窑中试反应器中进行中温段(450℃～650℃)热解所得产物油中石脑油馏分(i b p ～200℃)的品质。对原始热解油进行实沸点蒸馏,石脑油馏分的收率随热解温度的升高而明显增加,在600℃取得最大值40 48%,之后又有所下降。采...研究了废轮胎在回转窑中试反应器中进行中温段(450℃～650℃)热解所得产物油中石脑油馏分(i b p ～200℃)的品质。对原始热解油进行实沸点蒸馏,石脑油馏分的收率随热解温度的升高而明显增加,在600℃取得最大值40 48%,之后又有所下降。采用GC和GC MS对石脑油馏分的组成进行了分析。结果表明,热解石脑油具有很强的芳香性,而且芳烃含量随热解温度的升高而持续增加,热解温度在550℃以上的石脑油中的芳香烃含量超过80%。轻质单环芳烃苯、甲苯、乙苯和二甲苯等为其中的主要芳烃。热解石脑油中的脂肪烃多为不饱和烃。展开更多
基金supported by China-Central and Eastern Europe Universities Joint Education Project(2021128).
文摘Soybean soapstock(SS) is one of the main solid wastes produced in the refinery of edible oil processing. In this study, the co-pyrolysis of SS with iron slag(IS) and aluminum scrap(AS) was carried out in a tubular furnace. The gas, liquid and solid products were characterized and the char yield decreased with increasing IS/AS ratio. IS and AS can improve the gas yield, and when the ratio of SS/IS was 1:0.25, the total pyrolysis gas and hydrogen contents were significantly increased. The content of oxygen compounds in pyrolysis oil decreased during co-pyrolysis, while AS promoted the content of polycyclic aromatic hydrocarbons in pyrolysis oil. The co-pyrolysis reaction can be divided into four stages, the mass loss rate reaches the maximum at the third stage(390–575 ℃). The molar ratio of H/C was lower for pyrolysis,indicating good stability of pyrolysis char owing to the high degree of carbonization and aromaticity.The possible co-pyrolysis reaction mechanism was explored.
基金supported by the Basic Research Program of VCC Technology(ycsy2014ky-A-14)~~
文摘Scrap tires were pyrolyzed in a continuously stirred batch reactor in the presence and absence of catalysts. The maximum yield of derived oil was up to 55.65 wt%at the optimum temperature, 500 °C. The catalytic pyrolysis was performed using 1.0 wt%（on a scrap tire weight basis） of catalysts based on ZSM‐5, USY,β, SAPO‐11, and ZSM‐22. The oil products were characterized using simula‐tion distillation, elemental analysis, and gas chromatography‐mass spectrometry. The results show that using a catalyst can increase the conversion of scrap tires to gas and decrease char by‐products;the yield of derived oil remains unchanged or a little lower. The oils derived from catalytic pyrolysis had H/C ratios of 1.55–1.65 and contained approximately 70–75 wt%light oil, 0.3–0.58 wt%S and 0.78–1.0 wt%N. Catalysts with high acid strengths and appropriate pore sizes, such as ZSM‐5, USY,β, and SAPO‐11, increased the amount of single‐ring aromatics in the light‐middle‐fraction oil to 45 wt%. The derived oil can therefore be used as a petrochemical feedstock for producing high‐value‐added chemical products or fuel oil.
基金the Doctor Starting Foundation of Jiangxi University of Science and Technology of China(Grant No.jxxjbs17008,and jxxjbs17034)Education Department Project Fund of Jiangxi Province(Grant No.GJJ170547)+1 种基金Natural Science Foundation of Jiangxi Province(Grant No.2013BBG70003)National Natural Science Foundation of China(Grant No.51364014)are gratefully acknowledged.
文摘For disposal of scrap tyres,there have been a lot of studies done by previous researchers,but it yet remains a longstanding challenge in practice.To find a solution for this problem,the feasibility of a proposed approach in a laboratory scale was tested.The pyrolysis of scrap tyres pretreated by waste coal tar(noted as "as-pretreated" tyres)was performed in a batch reactor at atmospheric pressure.Waste coal tar was used to modify the scrap tyres to improve the pyrolysis efficiency of scrap tyres input and the quality of the product tar.The swelling behavior of scrap tyres soaked in waste coal tar at 10℃,effect of pyrolysis temperature on the product yields,and the synergies during pyrolysis of the as-pretreated tyres and co-pyrolysis of scrap tyres/waste coal tar mixture were all investigated in detail.The results observed found that by comparison of the calculated yields and the observed experimental yields for pyrolysis products,the synergy from co-pyrolysis of scrap tyres/waste coal tar mixture boosted the gas yield without increasing the tar yield.In contrast,the synergy during pyrolysis of the as-pretreated tyres could enhance the tar yield,but reduced the gas and char yields.According to the distillation range analyses of the tar,more light fractions were found in the tar from pyrolysis of the as-pretreated tyres,in which the gasoline fraction,diesel fraction and kerosene fraction were 38.4 wt%,46.8 wt%and 50.2 wt%,respectively.This work is expected to be helpful in further use of scrap tyres.
文摘研究了废轮胎在回转窑中试反应器中进行中温段(450℃～650℃)热解所得产物油中石脑油馏分(i b p ～200℃)的品质。对原始热解油进行实沸点蒸馏,石脑油馏分的收率随热解温度的升高而明显增加,在600℃取得最大值40 48%,之后又有所下降。采用GC和GC MS对石脑油馏分的组成进行了分析。结果表明,热解石脑油具有很强的芳香性,而且芳烃含量随热解温度的升高而持续增加,热解温度在550℃以上的石脑油中的芳香烃含量超过80%。轻质单环芳烃苯、甲苯、乙苯和二甲苯等为其中的主要芳烃。热解石脑油中的脂肪烃多为不饱和烃。
