Ruthenium-based catalyst for preparing gamma-valerolactone from acetylpropionic acid, and preparation method for ruthenium-based catalyst

Abstract

The invention provides a ruthenium-based catalyst for preparing gamma-valerolactone from acetylpropionic acid, and a preparation method for the ruthenium-based catalyst. The ruthenium-based catalyst comprises an active ingredient and a catalyst carrier, wherein the active ingredient is ruthenium and accounts for 1 to 10 weight percent and the rest is the catalyst carrier; or the ruthenium-based catalyst comprises an active ingredient, a cocatalyst and a catalyst carrier, wherein the cocatalyst is a group VIII element or a group IB element and accounts for not more than 10 weight percent, the active ingredient is ruthenium and accounts for 1 to 5 weight percent, and the rest is the catalyst carrier. An acetylpropionic acid solution can be completely converted under the action of the ruthenium-based catalyst at the temperature of between 70 and 120DEG C under the pressure of 1 to 5MPa, and the selectivity of the gamma-valerolactone is up to 100 percent. The invention has the advantages that the catalyst is prepared by a green synthesis process, the process is simple and easy to operate, the product selectivity is high, the production process is high in safety, environmental pollution is avoided, and the catalyst has potential industrial application value.

Description

technical field [0001] The invention belongs to the technical field of biomass conversion, and relates to a preparation method and a technical process of a loaded ruthenium-based catalyst used for preparing gamma-valerolactone from biomass-based levulinic acid. Background technique [0002] With the increasing shortage of fossil energy and the crisis of environmental degradation worldwide, the development of new and environmentally friendly renewable energy and chemicals has become a hot field of current scientific research. Biomass, as a green renewable resource, has received more and more attention. Biomass is a renewable resource that can be converted into liquid fuels and carbon-based chemicals. It is huge, cheap, biodegradable, and it is of great significance to convert it in an environmentally friendly medium. In addition, biomass resources are also a carbon-neutral resource, which is of immeasurable significance for solving the increasingly serious "greenhouse effect...

AI Technical Summary

Problems solved by technology

Patents WO 02074760 and US0055270 indicate that under the reaction conditions of 4.83-5.52MPa hydrogen pressure and 140-160°C, levulinic acid can be reduced to γ-valerolactone under the action of a supported noble metal catalyst, but under high temperature and high pressure conditions under very harsh reaction conditions

[0008] Patent CN 101376650A uses formic acid as the hydrogen source, as the reducing agent, the reaction temperature is 100-200°C, and the homogeneous ruthenium catalyst is used, which exists in liquid form, which is not conducive to catalyst recovery, and the reaction time is as long as 12 hours. Shortcomings such as low yield of valerolactone

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