Method and device for producing organic acid or alcohol by fermenting synthetic gas

Abstract

The invention relates to a method for producing organic acid or alcohol by fermenting synthetic gas, which comprises the following steps: (1) adding anaerobic bacteria capable of metabolizing CO, H2 and CO2 to produce organic acid or alcohol into a reactor filled with inert particles which are used as a vector; (2) introducing synthetic gas, which is composed of one or more of CO, H2 and CO2, into the reactor, enabling the vector to be in a fluidized state and keep the fluidized state, thoroughly mixing the anaerobic bacteria and the vector, and fermenting; and (3) adding a liquid culture medium into the reactor, and flushing the suspended anaerobic bacteria out of the reactor, so that the microbes attached to the surface of the vector form a biomembrane. The invention also provides a device for implementing the method. The invention fully utilizes the characteristic of high mass transfer efficiency of the solid / liquid internal circulation fluidized bed, and is assisted by the gas external circulation technology, thereby realizing high-efficiency conversion from synthetic gas into organic acid or alcohol.

Description

technical field [0001] The invention belongs to the field of microbial fermentation engineering, specifically a method for producing organic acid or alcohol by using synthesis gas (carbon monoxide, hydrogen, carbon dioxide) as raw material through microbial fermentation. [0002] The invention also relates to a device for implementing the above method. Background technique [0003] Syngas is a kind of mixed gas with carbon monoxide, carbon dioxide and hydrogen as the main components. It can not only be produced by the vaporization of solid fuels such as coal or coke, or produced from light hydrocarbons such as natural gas and petroleum, but also from heavy oil through partial oxidation. At the same time, biomass such as straw, sedge, agricultural and forestry waste, and urban organic solid waste can be used as raw materials for its production, with a wide range of sources. In addition to being directly used as an energy fuel, syngas is also an important basic raw material f...

AI Technical Summary

Problems solved by technology

Among them, the continuous stirred tank reactor is the most widely used in laboratory-scale synthesis gas fermentation, and its volumetric mass transfer coefficient (KLa) increases with the increase of stirring power per unit volume (P / V) and superficial gas velocity (Ug) And improve, but increasing Ug will cause the conversion rate of gaseous substrate to reduce, and high P / V means energy consumption increases, and this just limits its application on industrial scale to a certain extent

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