Process for continuously producing corresponding aldehyde by alkene hydroformylation reaction

Abstract

The invention discloses a process for continuously producing corresponding aldehyde by alkene hydroformylation reaction. The process comprises the following steps: heating a water-soluble alkene hydroformylation catalyst water solution to between 80 and 95 DEG C and then making the water-soluble alkene hydroformylation catalyst water solution enter NO. 1 and NO.2 alkene hydroformylation continuous reactors (I and II) from liquid distributors (2' and 2'); when the catalyst water solution is cyclically stable, introducing mixed gas of alkene and synthesis gas of purified hydrogen and carbon monoxide to the NO.1 reactor, and carrying out hydroformylation reaction on the alkene on an interface of a cyclical catalyst liquid membrane; discharging unreacted mixed gas at the end of a separation section of the bottom of the NO.1 reactor and a gas-phase byproduct from the NO.1 reactor; automatically separating an aldehyde product from the catalyst water solution, discharging the aldehyde product and the catalyst water solution from liquid aldehyde outlet (4') of the NO.1 reactor, and making the aldehyde product and the catalyst water solution enter a coarse aldehyde tank (12); and supplementing the mixed gas of the alkene and the synthesis gas of the hydrogen and the carbon monoxide by the unreacted mixed gas which is discharged from a reaction residual gas outlet (3') of the NO.1 reactor and the gas-phase byproduct, and introducing the mixed gas into the NO.2 reactor (II) to further react.

Description

technical field [0001] The invention relates to a continuous production process for hydroformylation of olefins, carbon monoxide and hydrogen under the action of a catalyst to generate corresponding aldehydes. technical background [0002] Alkenes with CO and H 2 Under the action of a catalyst, a hydroformylation reaction occurs to generate an aldehyde, and the generated aldehyde can be hydrogenated to produce the corresponding alcohol. The production capacity of synthesizing alcohol by this method is in the millions of tons in the world. Hydroformylation reaction of ethylene or propylene with carbon monoxide and hydrogen under the action of rhodium carbonyl catalyst to generate propionaldehyde or butyraldehyde, and further hydrogenation to generate propanol or butanol is one of the important chemical processes. [0003] The technology that the formylation reaction used in industrial production generates corresponding aldehyde is made up of two-stage stirred reactor and co...

AI Technical Summary

Problems solved by technology

However, the bubble-type mass transfer interface formed by the bubble reactor is far from meeting the needs of high-efficiency reactions.

Second, the utilization rate of raw materials is low

This makes the tail gas from the second-stage reactor contain a large amount of carbon monoxide and hydrogen without utilization

Third, high energy consumption

This is because under relatively high pressure (such as ethylene hydroformyl reaction pressure 2.2Mpa), the dynamic seal of the stirring equipment is easily damaged, and often needs to be shut down for maintenance

This leads to the fifth problem of high maintenance costs. These problems not only affect the normal production, but also increase production costs

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