AROMATICS ISOMERIZATION USING CATALYST CONTAINING MODIFIED SILICOALUMINOPHOSPHATE MOLECULAR SIEVE

• Main Authors: PATTON, ROBERT L, LESCH, DAVID A, REYNOLDS, THOMAS M, HOLMGREN, JENIFFER S, HAMMERMAN,JOHN I, ROESELER, CARA MOY, FLANIGEN, EDITH M, GAJDA, GREGORY J
• Format: Patent
• Language: English; Korean
• Published: 15.06.1999
• Edition: 6
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; APPARATUS THEREFOR; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; GENERAL METHODS OF ORGANIC CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING

본 발명은 알킬방향족 탄화수소를 제조하기 위한 신규 이성질화 공정을 제공하는 것이다. 보다 구체적으로, 본 발명은 증진된 크실렌 수율을 수득하기 위하여 크게 제한된 분자체 촉매를 사용하는 C-방향족 탄화수소의 이성질화 방법에 관한 것이다. A non-equilibrium C8 aromatic-feed mixture is selectively isomerized to obtain an isomerized product enriched in para-xylene by contacting the feed in the presence of hydrogen with a catalyst containing a combination of a platinum group component with an SM-3 acidic crystalline silicaaluminophosphate molecular sieve at C8 aromatic isomerization conditions. The SM-3 molecular sieve is enriched in framework silicon at the surface, resulting in a greater yield of para-xylene compared to prior art processes.