The composition of low temperature pyrolysis coal tar has an effect on its further processing and reasomble utlization In this paper, the compeition or coal tars produced from both low temperature pyroysis in a fluidi...The composition of low temperature pyrolysis coal tar has an effect on its further processing and reasomble utlization In this paper, the compeition or coal tars produced from both low temperature pyroysis in a fluidized bed aud flash pyrolysis with solid heat carrier have been investigated by the methch of fractional seperation and Gas Chromatography-Mass Spectrometry (GC-MS)- It is observed that the degree of coalification maceral and secondary reaction temperature (freeboard temperature in a fluidized bed) have some iufluence on the composition of coal tars- The main compoundes are phenol cresols,xylenols, naphthalene, alkylnaphthalenes, antbraceue, phenanthrene,acenaphthylene, fluoren, indene and so展开更多
A kind of ACR resin was studied by pyrolysis gas chromatograph-mass spectrometry(PGC-MS).The sample was pyrolysed between 200 ℃ and 600 ℃.The pyrolysis products were separated with HP-5MS quartz capillary column and...A kind of ACR resin was studied by pyrolysis gas chromatograph-mass spectrometry(PGC-MS).The sample was pyrolysed between 200 ℃ and 600 ℃.The pyrolysis products were separated with HP-5MS quartz capillary column and analyzed by mass spectrometry.The characteristics peaks of ACR resin were obtained and the components of ACR resin were identified.The results showed that the PGC-MS method would provide more information in study of pyrolysis process and structure of ACR resin.展开更多
Gold-tube pyrolysis experiments were performed on two Athabasca oil sand bitumens at 300℃to 525℃with 2℃/h rate and 25℃step under 50 MPa.Pyrolysis temperature of 425℃is critical for weight loss of bulk bitumen and...Gold-tube pyrolysis experiments were performed on two Athabasca oil sand bitumens at 300℃to 525℃with 2℃/h rate and 25℃step under 50 MPa.Pyrolysis temperature of 425℃is critical for weight loss of bulk bitumen and hydrocarbon generation and destruction.Polar compounds are the main source of saturated and aromatic hydrocarbon,gas and coke fractions.Molecular compositions in pyrolyzates vary systematically with increasing pyrolysis temperatures.High molecular weight n-alkanes(C26^+) are gradually destructed during pyrolysis due to thermal cracking.Moderate molecular weight n-alkanes(C21-C25)show the highest thermal stability in designed pyrolysis temperatures.The loss of low molecular weight n-alkanes(C20^-)might be caused by volatilization during pyrolysis,which may alter commonly used molecular parameters such as∑n-C20^-/∑n-C21^+,Pr/n-C17 and Ph/n-C18.Aromatic hydrocarbons were generated from 300 to 425℃,then condensation and dealkylation have been initiated at 425℃as evidenced by decreased summed alkylnaphthalenes to alkylphenanthrenes ratios and increased unsubstituted aromatics to substituted homologs ratios in higher temperatures.The occurrence of anthracene and benz[a]anthracene in pyrolysates indicates pyrogenic origin,while fluoranthene shows unexpected behaviors during pyrolysis.Ratios derived from them are not always reliable for pyrogenic source input diagnosis in environmental samples.展开更多
The analysis of microstructure and polymeriza-tion degree showed that acid wash altered the cellulose morphology and decreased the polymerization degree signifi-cantly.A series of experiments were done to study the ef...The analysis of microstructure and polymeriza-tion degree showed that acid wash altered the cellulose morphology and decreased the polymerization degree signifi-cantly.A series of experiments were done to study the effect of acid wash on cellulose rapid pyrolysis.Experimental results showed that under acid pretreatment,the yield of bio-oil decreased while the production of gas and char increased.With an increase in acid concentration,this trend would be further enhanced.Sulphuric acid limited the formation of bio-oil more effectively than hydrochloric acid and pho-sphoric acid.According to the GC-MS analysis of bio-oil,high-concentration acid wash restrained the formation of levoglucosan by catalyzing dehydration process and cross linking reaction.展开更多
文摘The composition of low temperature pyrolysis coal tar has an effect on its further processing and reasomble utlization In this paper, the compeition or coal tars produced from both low temperature pyroysis in a fluidized bed aud flash pyrolysis with solid heat carrier have been investigated by the methch of fractional seperation and Gas Chromatography-Mass Spectrometry (GC-MS)- It is observed that the degree of coalification maceral and secondary reaction temperature (freeboard temperature in a fluidized bed) have some iufluence on the composition of coal tars- The main compoundes are phenol cresols,xylenols, naphthalene, alkylnaphthalenes, antbraceue, phenanthrene,acenaphthylene, fluoren, indene and so
文摘A kind of ACR resin was studied by pyrolysis gas chromatograph-mass spectrometry(PGC-MS).The sample was pyrolysed between 200 ℃ and 600 ℃.The pyrolysis products were separated with HP-5MS quartz capillary column and analyzed by mass spectrometry.The characteristics peaks of ACR resin were obtained and the components of ACR resin were identified.The results showed that the PGC-MS method would provide more information in study of pyrolysis process and structure of ACR resin.
基金supported by National Natural Science Foundation of China(Grant Number 41573035,41873049)the Mitacs project at University of Calgary。
文摘Gold-tube pyrolysis experiments were performed on two Athabasca oil sand bitumens at 300℃to 525℃with 2℃/h rate and 25℃step under 50 MPa.Pyrolysis temperature of 425℃is critical for weight loss of bulk bitumen and hydrocarbon generation and destruction.Polar compounds are the main source of saturated and aromatic hydrocarbon,gas and coke fractions.Molecular compositions in pyrolyzates vary systematically with increasing pyrolysis temperatures.High molecular weight n-alkanes(C26^+) are gradually destructed during pyrolysis due to thermal cracking.Moderate molecular weight n-alkanes(C21-C25)show the highest thermal stability in designed pyrolysis temperatures.The loss of low molecular weight n-alkanes(C20^-)might be caused by volatilization during pyrolysis,which may alter commonly used molecular parameters such as∑n-C20^-/∑n-C21^+,Pr/n-C17 and Ph/n-C18.Aromatic hydrocarbons were generated from 300 to 425℃,then condensation and dealkylation have been initiated at 425℃as evidenced by decreased summed alkylnaphthalenes to alkylphenanthrenes ratios and increased unsubstituted aromatics to substituted homologs ratios in higher temperatures.The occurrence of anthracene and benz[a]anthracene in pyrolysates indicates pyrogenic origin,while fluoranthene shows unexpected behaviors during pyrolysis.Ratios derived from them are not always reliable for pyrogenic source input diagnosis in environmental samples.
基金supported by the National Natural Science Foundation of China(Grant No.50476057)。
文摘The analysis of microstructure and polymeriza-tion degree showed that acid wash altered the cellulose morphology and decreased the polymerization degree signifi-cantly.A series of experiments were done to study the effect of acid wash on cellulose rapid pyrolysis.Experimental results showed that under acid pretreatment,the yield of bio-oil decreased while the production of gas and char increased.With an increase in acid concentration,this trend would be further enhanced.Sulphuric acid limited the formation of bio-oil more effectively than hydrochloric acid and pho-sphoric acid.According to the GC-MS analysis of bio-oil,high-concentration acid wash restrained the formation of levoglucosan by catalyzing dehydration process and cross linking reaction.
