Method for preparing alcohol through hydroformylation of olefin which is directly regenerated and reused by cobalt catalyst

Abstract

The invention discloses a method for preparing alcohol through hydroformylation of olefin which is directly regenerated and reused by a cobalt catalyst. According to the method, a deactivated catalyzing system can recover reaction activity through pretreatment, an intermittent type reaction kettle is utilized, reaction pressure is 4 to 18 MPa, a temperature is 170 to 210 DEG C, and CO and H2 mixedgas is utilized to react. A deactivated catalyst pretreatment work procedure is performed in a reaction kettle under the CO and hydrogen mixed condition. The method has a simple technology, can greatly reduce production cost and can improve production efficiency.

Description

technical field [0001] The invention relates to a method for preparing alcohols by hydroformylation of olefins, in particular to a method for preparing alcohols by directly regenerating recycled olefins hydroformylation with a cobalt catalyst. Background technique [0002] Carbonyl synthesis is also called hydroformylation. The reaction process of alkenes, carbon monoxide and hydrogen under the action of catalysts, adding hydrogen atoms and formyl groups to the double bonds of alkenes to generate two isomeric aldehydes with one more carbon atom than the original alkenes. Since the final product in industry is alcohol, the reaction of hydrogenation of aldehyde to alcohol is often included in the oxo synthesis. [0003] The oxo industry has a history of 50 years, and its industrial technology has been innovated along with the continuous innovation of the catalyst system. It has experienced high-pressure cobalt method, modified cobalt method, modified rhodium method, etc. The...

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Problems solved by technology

In the above method, the cobalt element is recovered by the method of destruction, and the oxidative destruction in acidic conditions is the premise. There are two problems in this type of method: one is that the process is complicated; the other is that it can only be used for systems without ligands. system, due to the reducibility of the phosphine ligand, if it is oxidized and destroyed in acidic conditions, a large amount of ligand will be lost, and the economy is poor

For the method of continuous use of two-phase reaction catalysts, there are usually the following problems: for the unmodified system, the utilization rate of cobalt element is low, and most of the cobalt element is always in the water phase and cannot participate in the reaction; and the phase is realized by adjusting the phosphine ligand. In the separation method, since the final complex has a certain distribution ratio in the water phase and the oil phase, the recovery rate is usually low. In addition, the design of a phosphine ligand with a special structure is expensive and has no industrial value.

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