About CHEMBIO2019 2019 4th International Conference on Chemistry and Biochemical Engineering (CHEMBIO2019) (http://www.chembioeng.net/2019/en/home) is a platform for academic communications between specialists and scholars in the fields of chemistry and biochemical engineering. CHEMBIO2019 will be held in Xi'an, China during May 29-31, 2019. Xi'an is the capital of Shaanxi Province, located in the northwest of China. Publication 2019 4th International Conference on Chemistry and Biochemical Engineering (CHEMBIO2019) accepts original and unpublished papers. Both Full paper and Abstract are welcomed. Full papers accepted by the conference will be published online in the following journals of Science Publishing Group (http://www.sciencepublishinggroup.com). The journals have been indexed and abstracted by WorldCat, CrossRef, Electronic Journals Library, CNKI, Zeitschriftendatenbank, EZB, ResearchBib, Polish Scholarly Bibliography, Wissenschaftszentrum Berlin, etc. Modern Chemistry (MC) http://www.sciencepublishinggroup.com/j/mc ISSN Print: 2329-1818 ISSN Online: 2329-180X American Journal of Chemical Engineering (AJCHE) http://www.sciencepublishinggroup.com/j/ajche ISSN Print: 2330-8605 ISSN Online: 2330-8613 Advances in Biochemistry (AB) http://www.sciencepublishinggroup.com/j/ab ISSN Print: 2329-0870 ISSN Online: 2329-0862 Science Discovery (SD) http://www.sciencepublishinggroup.com/j/sd ISSN Print: 2331-0642 ISSN Online: 2331-0650