Process for direct synthesis of (meth)acrolein from ethers and/or acetals

• Main Author: DUBOIS JEAN-LUC
• Format: Patent
• Language: Chinese; English
• Published: 23.11.2016
• 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

The subject matter of the present invention is a process for direct synthesis of (meth)acrolein from a reactive mixture comprising at least one compound chosen from ethers, acetals or hemiacetals derived from linear alcohols comprising from 1 to 3 carbon atoms. Examples of compounds are dimethyl ether, diethyl ether, methyl ethyl ether, dimethoxymethane, diethoxymethane, dipropoxymethane, 1,1-dimethoxyethane or 1,1-diethoxyethane. The process of the invention comprises two successive phases: oxidation then aldol condensation, which can be carried out in the presence of a solid oxidation catalyst chosen from molybdenum-based catalysts and optionally of an aldol condensation catalyst. These two phases are carried out in a reaction system comprising a single reactor or optionally two reactors in cascade. 本发明的主题是用于从包括以下的反应混合物直接合成(甲基)丙烯醛的方法：至少种选自衍生自包括1-3个碳原子的线性醇的醚、缩醛或半缩醛的化合物反应混合物。化合物的实例为二甲醚、二乙醚、甲基乙基醚、二甲氧基甲烷、二乙氧基甲烷、二丙氧基甲烷、1,1-二甲氧基乙烷或1,1-二乙氧基乙烷。本发明的方法包括两个连续的阶段：氧化然后醇醛缩合，其可在选自基于钼的催化剂的固体氧化催化剂和任选地醇醛缩合催化剂的存在下进行。这两个阶段在包括单