Biological reducing preparation method of catalyst used for synthesizing pyruvaldehyde

Abstract

The invention provides a biological reducing preparation method of a catalyst used for synthesizing pyruvaldehyde, which relates to a catalyst used for synthesizing pyruvaldehyde. The invention provides the biological reducing preparation method of the catalyst used for synthesizing the pyruvaldehyde. The biological reducing preparation method comprises the following steps of: preparing microorganisms with expanded culture into bacterium powder for later use by drying and grinding; preparing the bacterium powder into bacterium suspension, then mixing with an alkali solution and a silver compound and obtaining mixed liquid containing biomass and nano silver sol after reacting; separating the mixed liquid centrifugally and collecting supernatant liquid to obtain silver sol wrapt with the biomass; after drying a lower-layer precipitate, obtaining lower-layer silver powder; evaporating and concentrating the silver sol, adding an organic solvent to dewater and precipitate silver colloidal particles, filtering or centrifugally separating and collecting a precipitate; after drying, obtaining upper-layer silver powder; and dissolving the upper-layer silver powder or the lower-layer silver powder into deionized water, adding a carrier according to the mass ratio of 1:(0.1 to 0.4) of the carrier to the silver powder and obtaining a product after soaking, drying and calcining.

Description

technical field [0001] The invention relates to a catalyst for synthesizing methylglyoxal, in particular to a bioreduction preparation method for the catalyst for synthesizing methylglyoxal. Background technique [0002] Methylglyoxal, also known as methylglyoxal, is a yellow-green liquid that has unique reactivity due to two adjacent carbonyl groups. It is an important synthetic intermediate and can be used to synthesize pharmaceutical intermediates such as 4- Methylimidazole, which can also be used in biochemistry and organic synthesis, can be used to obtain lactic acid, which is widely used, through gasification. The synthesis methods of methylglyoxal mainly include acetone method and 1,2-propanediol method, the latter has better yield and industrialization prospect. [0003] The traditional manufacturing process of aceglyoxal (see patent documents: CN1586719, CN1240203, CN1145276, CN1105977, JP10287610, JP61068440, JP56150035, US4302609) uses 1,2-propanediol as raw mate...

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Problems solved by technology

The problem with this method is that the reaction temperature is relatively high. In order to achieve a high yield, the general reaction temperature needs to be above 500°C. At the same time, the electrolytic silver catalyst is easy to agglomerate at high temperature, which will lead to a sharp decline in the activity of the catalyst. , the reaction bed pressure increased, and finally had to stop production

Moreover, at high temperature, the raw materials are prone to breakable bonds and undergo deep oxidation, and the surface of the catalyst is also prone to carbon deposition. It is still a challenge to obtain high conversion and selectivity at such a high temperature.

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