摘要:
Provided is an expression vector including a nucleotide sequence for encoding lysine decarboxylase CadA, and a sequence of a constitutive promoter for regulating the expression of the nucleotide sequence. Also provided is a recombinant microorganism including the expression vector and a method of producing 1,5-diaminopentane by using the recombinant microorganism.
摘要:
A method for preparing a pyruvate ester is disclosed. In the method of the present invention, a lactate ester is oxidized by hydrogen peroxide in the presence of a Ti—Si molecular sieve catalyst. In the present invention, the Ti—Si molecular sieve catalyst is easily filtered and recycled, the reaction conditions are mild due to the usage of hydrogen peroxide, the process is simple and easily performed, the conversion rate of the lactate ester is high, and the selectivity of the pyruvate ester is high.
摘要:
A method for preparing catechol is provided. The method includes performing hydroxylation of phenol by using zirconium-containing titanium silicalite as a catalyst in the presence of phenol, a solvent and hydrogen peroxide. The method uses zirconium-containing titanium silicalite as a catalyst to increase the selectivity of phenol and utilization of hydrogen peroxide, and thus to increase the overall reaction yield.
摘要:
A method for producing a ketoxime is provided. The method includes the step of performing a reaction of a nitrogen-containing compound, ketone and an oxidant by using a titanium-silicon molecular sieve as a catalyst, so as to form the ketoxime, thereby increasing the yield and selectivity of the ketoxime.
摘要:
A method for continuously preparing a carboxylic acid ester is disclosed. In the method of the present invention, a vertical reactor is filled with a solid catalyst, a carboxylic acid and an alcohol are introduced into a lower part of the vertical reactor, esterification is performed to form an esterized mixture, the esterized mixture is output from an upper part of the vertical reactor, and distillation is performed to isolate the carboxylic acid ester. The method of the present invention is simple, easily controlled and environmental friendly, and has significantly high conversion rate and selectivity.
摘要:
A method for producing an epoxide is disclosed. The method includes performing a reaction of an olefin compound and an oxidant by using a titanium-silicon molecular sieve as a catalyst, in the presence of a silicon oxide containing an alkaline earth metal as a coagent. The selectivity and yield of epoxide are increased by using a silicon oxide containing an alkaline metal as a coagent.
摘要:
A lithium salt is disclosed. The lithium salt includes a lithium ion and an anion represented by formula (I), wherein R1 to R5 are independently selected from hydrogen atom, cyano group, fluorine atom, and C1-C5 alkyl group, in which the C1-C5 alkyl group is substituted with at least one fluorine atom. The present invention further provides an electrolyte solution and a lithium battery containing the lithium salt to enable a high conductivity of the battery at a high temperature.
摘要:
The present invention provides a titanium-silicalite molecular sieve and a method for preparing the same. The method includes the steps of preparing a mixture of a titanium source, a silicon source, a transition metal source, a template agent and water; heating the mixture to form a gel mixture; heating the gel mixture in a water bath; and calcining the gel mixture after the gel mixture in the water bath to form the titanium-silicalite molecular sieve. The present invention further provides a method for preparing cyclohexanone oxime by using the titanium-silicalite molecular sieve as the catalyst which results in high conversion rate, high selectivity and high usage efficiency of hydrogen peroxide.
摘要:
The present invention provides a method for preparing an amide. The method includes the steps of performing in a reactor including a catalyst composition having a nitrogen-containing heterocyclic compound and sulfuric acid Beckman rearrangement of a ketoxime to form a product stream having the amide, wherein a molar ratio of the nitrogen-containing heterocyclic compound to the sulfuric acid is from 1:1 to 1:8; and separating an organic phase having the amide and an aqueous phase having the catalyst composition from the product stream. The present invention facilitates the regeneration of the catalyst composition with low water content, so as to increase the conversion rate of a ketoxime and the selectivity of an amide.
摘要:
Provided is a recombinant microorganism including at least two genes for producing itaconic acid and its derived monomers, and the at least two genes are located on the same expression vector. The at least two genes include one encoding cis-aconitic acid decarboxylase and the other one encoding aconitase, and the genome of the recombinant microorganism includes a gene encoding the molecular chaperone protein GroELS. Also provided is a method for producing itaconic acid by using the microorganism.