43results about How to "High final concentration" patented technology

The invention discloses a genetic engineering strain for producing (R, R)-2,3-butanediol, as well as a construction method and an application thereof, and belongs to the field of genetic engineering. The genetic engineering strain is a genetic engineering strain obtained by transforming escherichia coli (Escherichia coli)MG1655 by a budB gene, a budA gene and a ydiL gene through an expression vector pTrc99a. The strain disclosed by the invention is capable of highly producing a high-purity(R,R)-2,3-butanediol in a case of not adding inductive agents and has the advantages of good cell growth, quick consumption of the substrate, short fermentation period and low cost at the same time. The engineering strain also has important industrial application value for the bio-manufacturing of the (R, R)-2,3-butanediol.

The invention discloses a method and equipment for separating volatile organic matters from a fermented product. In the method, in-situ separation of the volatile organic matters is realized by coupling fermentation with a gas stripping / vapor permeation process. The method and the equipment are characterized in that: inert gas is introduced from a gas distributor at the bottom of a fermentation tank; in-situ gas is extracted from the volatile organic matters and enters a vapor permeation device so as to separate water from the organic matters; dehydrated mixed gas enters a condenser to recycle the volatile organic matters; and non-condensable gas and a water vapor component containing a small number of organic matters can be recycled. The method and the equipment have the advantages of eliminating product inhibition, enhancing fermentation intensity, saving water and reducing energy consumption along with high in-situ movement efficiency of the volatile organic matters in a fermentation process. The volatile organic matters in the invention comprise ethanol, propanol, acetone, butanol and the like.

Disclosed is a process for treating a gas stream containing hydrochloric acid, hydrofluoric acid, a fluorinated compound and halogenated organic compounds, wherein the gas stream is subjected to: (a) a step of washing with an acid solution to obtain a washed gas stream; (b) a step of adiabatic absorption in an aqueous solution of the hydrochloric acid contained in said washed gas stream, to collect a solution of hydrochloric acid; (c) a step of adsorption on activated carbon of the impurities present in said hydrochloric acid solution, to obtain a purified hydrochloric acid solution and a gas stream containing said fluorinated compound; and (d) a step of bringing said purified hydrochloric acid solution into contact with a silica gel. Also disclosed is a plant for the implementation of this process, and also a process for preparing a fluorinated compound comprising the catalytic pyrolysis of an organofluorine compound.