Chemical Engineering & Technology: http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1521-4125
Chemical Engineering and Processing: Process Intensification: http://www.journals.elsevier.com/chemical-engineering-and-processing-process-intensification/
Chemical Engineering Communications: http://www.tandfonline.com/loi/gcec20
Chemical Engineering Journal: http://www.journals.elsevier.com/chemical-engineering-journal/
Chemical Engineering Research and Design: http://www.journals.elsevier.com/chemical-engineering-research-and-design/
Chemical Engineering Science: http://www.journals.elsevier.com/chemical-engineering-science/
Current Opinion in Chemical Engineering: http://www.journals.elsevier.com/current-opinion-in-chemical-engineering/
Chemical Engineering Science and AIChe Journal are the top journals related with theoretical aspects of Chemical Engineering. For other specific topics one should look for more specialized journals. Another interesting journal is Chemical Engineering Communications
Chemical Engineering Science, Chemical Engineerng Journal, AIChe Journal The Canadian Journal of Chemical Engineering, Chemical Engineering Research and Design, Industrial Engineering & Chemistry Research, Chemical Engineering Communications, Journal of Chemical Engineering Data
My personal choices are that of He Xuezhog above, to which I add Chemical Engineering Research and Design. The list of Carlos Queiroz is very complmete