A method for preparing methyl lactate from supported nickel oxide catalyzed hexavalent sugar in a near-critical methanol medium

Abstract

The invention discloses a method for preparing methyl lactate from six-membered sugars catalyzed by supported nickel oxide in a near-critical methanol medium. The steps of the method are as follows: 1) Add six-membered sugar and methanol into a stirred high-temperature and high-pressure reactor. The mass concentration of the six-membered sugar is 10g / L ~ 150g / L, then add a supported nickel oxide catalyst, and the six-membered sugar and The mass ratio of the supported nickel oxide catalyst is 10:1-1:1; 2) Turn on stirring, heat to 140~240°C, reaction time is 1~12h; 3) After the reaction is completed, cool to room temperature, filter, and the filtrate is After distillation, the methyl lactate product is obtained, and the methanol is reused; the filter residue is obtained as a supported nickel oxide catalyst, which is washed and dried with methanol and reused. The invention solves the problem that it is difficult to industrialize the preparation of methyl lactate from six-membered sugars catalyzed by nano-nickel oxide. It has high mass yield of methyl lactate, good catalyst reusability, green method, low cost and good industrial application prospects.

Description

technical field [0001] The invention relates to a method for preparing methyl lactate from hexavalent sugar catalyzed by supported nickel oxide in a near-critical methanol medium. Background technique [0002] The chemical products obtained through petroleum refining are the basis of the modern chemical industry, but with the depletion of petrochemical resources, the development of the modern chemical industry is restricted, and it is imminent to seek alternative resources. Biomass is generally regarded as a good alternative resource. The preparation of fuels and chemicals from sugars is an important way to utilize biomass resources. Hexasaccharides are renewable green resources with the most abundant content from biomass. Converting them into high value-added chemicals through chemical methods is of great importance to human beings. Sustainable development is of great significance. [0003] Methyl lactate (Methyl DL-lactate, CAS number: 547-64-8), the structural formula i...

AI Technical Summary

Problems solved by technology

Although nano-nickel oxide is used as a catalyst, the conversion rate of glucose and the selectivity of methyl lactate are significantly improved compared with conventional catalysts, but nano-nickel oxide is easy to agglomerate, and it is difficult to load it in a fixed bed to achieve continuous operation. It is difficult to industrialize the preparation of methyl lactate from raw sugar

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