Method for recovering carbon dioxide by salting and extracting dihydric alcohol in fermentation liquor by coupling

Abstract

The invention belongs to the technical field of bioengineering and relates to a method for recovering carbon dioxide by salting and extracting dihydric alcohol in fermentation liquor by coupling. The method is characterized by comprising the following steps of: adding one or more soluble basic inorganic salts to the fermentation liquor of the dihydric alcohol, and then leading waste gas of an organic solvent to react with the salts to generate a salt phase, wherein CO2 reacts with the salt phase to generate an acid salt with a lower solubility; through a precipitation mode, filtering or centrifugalizing for separating the generated acid salt or adding an organic solvent for solventing-out crystallization; renewedly generating a basic salt by utilizing or carrying out pyrolysis on the acid salt which is used as a by-product; and recovering CO2 with a high concentration. The invention solves the problems of complicated separation process, low separation capacity, low total yield, high cost, large CO2 discharge quantity, and the like in the process of separating the dihydric alcohol from the fermentation liquor, has simplified process, short separation time, reduced cost, economy and feasibility and realizes the synchronous recovery of the dihydric alcohol, the inorganic salts and the CO2.

Description

technical field [0001] The invention belongs to the technical field of bioengineering, and relates to a separation technology of microbial fermentation liquid and a carbon dioxide fixation technology, in particular to a method for separating glycol from fermentation liquid and a technology for fixing carbon dioxide released by fermentation and separation. Background technique [0002] Diols have extensive and bright application prospects in industry, such as polytrimethylene terephthalate (PTT), a new polyester material synthesized from 1,3-propanediol and terephthalic acid, which has many polyester materials. It has excellent characteristics, such as nylon-like elastic recovery, anti-ultraviolet, ozone and nitrogen oxide colorability, low static electricity, low water adsorption, good continuous printing and dyeing without adding any special chemicals in the full color range and biodegradability. 2,3-butanediol is a valuable liquid fuel. 2,3-butanediol can be used to manuf...

AI Technical Summary

Problems solved by technology

2,3-butanediol is a valuable liquid fuel. 2,3-butanediol can be used to manufacture important industrial organic solvent methyl ethyl ketone; it can also be used to produce 2-butene and 1,3-butanediol 2,3-butanediol in the form of esterification is the precursor of synthetic polyimine, which can be used in drugs, cosmetics, lotions, etc.; diacetylation obtained by catalytic dehydrogenation Form of 2,3-butanediol can be used as a food additive with high value spices; L-form of 2,3-butanediol can be used as antifreeze due to its lower freezing point; It has shown potential application value in the fields of dyes, explosives, perfumes, drug carriers, etc., but its high price hinders its wide application

This salting-out extraction system is easy to form phases, the phase separation is clear, the viscosity of the extraction phase is low, the solvent is easy to recover, the system is easy to scale up, and the operation cost is low. Therefore, it is expected to solve the problem of difficult separation of dihydric alcohol fermentation products.