PROCESS FOR PREPARING UNSATURATED ESTERS PROCEEDING FROM ALDEHYDES BY DIRECT OXIDATIVE ESTERIFICATION

• Main Authors: LYGIN ALEXANDER, BALDUF TORSTEN, GROEMPING MATTHIAS, BURGHARDT RUDOLF, TEPPERIS ANDREAS, KRILL STEFFEN
• Format: Patent
• Language: English; Korean
• Published: 30.08.2016
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING

본 발명은 액체 상에서 2 내지 100 bar 의 압력에서 금 촉매를 사용하여 수행되는, 메타크롤레인과 산소 및 메탄올의 직접 산화적 에스테르화에 의해 메틸 메타크릴레이트를 제조하는 방법에 관한 것이다. 본 발명에 따라서, 액체 상은 반응기로부터 연속적으로 배출되며 임의로 산소성 기체로 농축되고, 배출 후 pH 는 염기성 용액의 첨가에 의해 5 내지 9 의 pH 로 조절되고, 이 액체 상은 적어도 50 % 의 정도로 반응기로 다시 이송된다. The present invention relates to a process for preparing methyl methacrylate by a direct oxidative esterification of methacrolein with oxygen and methanol, which is conducted in the liquid phase at a pressure of 2 to 100 bar with a gold catalyst. According to the invention, the liquid phase is withdrawn continuously from the reactor and optionally enriched with oxygenous gas, the pH, after the withdrawal, is adjusted to a pH between 5 and 9 by means of addition of a basic solution and this liquid phase is conducted back into the reactor again to an extent of at least 50%.