Moving bed catalytic method of aromatics methylation

• Main Authors: XIA JIANCHAO, KONG DEJIN, ZOU WEI
• Format: Patent
• Language: Chinese; English
• Published: 16.01.2013
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; ORGANIC CHEMISTRY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The invention relates to a moving bed catalytic method of aromatics methylation, mainly solving the problems of high temperature rise of catalyst bed, bad stability, discontinuous reaction, and low utilization rate of methanol in the prior art. The method disclosed herein comprises the following steps: a) letting alkylation reagent methanol enter into a fixed bed reactor to contact with a dehydration catalyst for reacting to obtain a mixed effluent I; b) mixing aromatics raw material with the mixed effluent I to obtain a reaction mixture II; c) putting the reaction mixture II into a moving bed reactor, contacting the reaction mixture II with the alkylation reagent while the alkylation reagent moves downward to obtain a dimethylbenzene-rich reaction effluent III; d) delivering the catalyst to be regenerated coming from the moving bed reactor to a catalyst regenerator to conduct coking regeneration; and e) delivering the regenerated catalyst back to the moving bed reactor for recycling. The method disclosed her