36results about How to "Unlimited concentration" patented technology

The invention discloses a method for preparing epoxide with a halogenohydrin method. The method comprises the following steps: (1) halogen alcoholization: adding H2O, halogen elementary substances and olefin compounds into a reaction device, and reacting to obtain halogenohydrin; (2) saponification: carrying out saponification on the halogenohydrin by a hydroxide of alkali metal to obtain the epoxide and alkali halide metal salt; (3) carrying out bipolar membrane electroosmosis on the alkali halide metal salt to obtain the hydroxide of alkali metal and halogen hydride. The invention also provides a method for preparing epoxide with the halogenohydrin method. The method comprises the following steps: (1) halogen alcoholization: carrying out halogen alcoholization reaction on the halogen hydride, H2O2 and olefin compounds to obtain halogenohydrin; optionally (2) saponification: carrying out saponification reaction on the halogenohydrin by a hydroxide of alkali metal to obtain the epoxide and alkali halide metal salt; optionally (3) carrying out bipolar membrane electroosmosis on the alkali halide metal salt to obtain the hydroxide of alkali metal and halogen hydride. According to the methods, the halogenohydrin or the epoxide can be prepared at extremely high selectivity and yield, and the discharging of waste water and waste residues can be drastically lowered.

The invention provides a method for preparing halohydrin. The method comprises the following steps: 1) halogen alcoholization: halogen hydride, H2O2, ethylene and Zr-containing hetero atoms having a MFI structural molecular sieve are added in a reaction apparatus, and then are subjected to a halogen alcoholization reaction to obtain halohydrin. The invention also provides a method for preparing ethylene oxide by a halogen alcoholization method, which comprises the following steps: 1) halogen alcoholization: halogen hydride, H2O2, ethylene and Zr-containing hetero atoms having the MFI structural molecular sieve are added in the reaction apparatus, and then are subjected to the halogen alcoholization reaction to obtain halohydrin; 2) saponification: halohydrin and hydroxide of alkali metal are subjected to a saponification reaction, then separated to obtain ethylene oxide and alkali halide metal salt; and optionally, 3) electrodialysis: the obtained alkali halide metal salt is subjected to bipolar membrane electrodialysis to obtain the hydroxide of alkali metal and the halogen hydride. The method is used for preparing halohydrin or ethylene oxide with high selectivity and yield, and greatly reduces the discharge of waste water and waste residue.

The invention provides a method for preparing halogenated propanol. The method comprises the following step: (1) halogenohydrination: a step of adding hydrogen halide, H2O2 and a catalyst into a reactor, after a period of time, adding propylene, and carrying out a halogenohydrination reaction so as to obtain halogenated propanol. The invention also provides a method for preparing propylene oxide through a halogenohydrination method. The method for preparing propylene oxide is characterized by comprising the step (1) as described in claim 1 of the patent, and also comprising the following steps: (2) saponification: a step of subjecting halogenated propanol in the step (1) and alkali metal hydroxide to a saponification reaction, and carrying out separation so as to obtain propylene oxide and halogenated alkali metal salt; and optionally, (3) electrodialysis: a step of subjecting the halogenated alkali metal salt obtained in the step (2) to bipolar membrane electrodialysis so as to obtain alkali metal hydroxide and hydrogen halide. With the methods provided by the invention, halogenated propanol or propylene oxide can be prepared with high selectivity and yield; meanwhile, the discharge of wastewater and waste residues is greatly reduced.

The invention discloses an electrolyte solution used for preventing the positive pole from scaling and producing electrolytic copper foil. An electrolyte solution body is a water solution dissolving copper sulfate, sulfuric acid and carboxylic acid, the content, calculated based on cupric ions, of copper sulfate in the electrolyte solution body is 60-90 g / L, the content of sulfate ions in the electrolyte solution body is 150-270 g / L, and a preparing method of the electrolyte solution for producing electrolytic copper foil mainly includes the steps of dissolving copper, filtering, purifying, adding carboxylic acid, mixing carboxylic acid uniformly and the like. According to the electrolyte solution used for preventing the positive pole from scaling and producing electrolytic copper foil, the surface of the electrolysis positive pole is effectively prevented from scaling in the copper foil production process, and the problems that due to positive pole scaling, a ti-based metal oxide positive pole loses efficacy in advance, and quality of electrolyzed copper foil descends seriously are solved.

The invention provides a method for preparing halogen ethyl alcohol. The method comprises the following step: (1) halogen alcoholization: adding halogen hydride, H2O2, ethylene and a Ti heteroatom-containing molecular sieve into a reaction device, and carrying out halogen alcoholization reaction to obtain the halogen ethyl alcohol. The invention also provides a method for preparing ethylene oxide with a halogenohydrin method. The method comprises the following steps: (1) halogen alcoholization: adding halogen hydride, H2O2, ethylene and a Ti heteroatom-containing molecular sieve into the reaction device, and carrying out the halogen alcoholization reaction to obtain the halogen ethyl alcohol; (2) saponification: carrying out saponification reaction on the halogen ethyl alcohol in the step (1) and a hydroxide of alkali metal, and separating to obtain the ethylene oxide and alkali halide metal salt; optionally (3) electroosmosis: carrying out bipolar membrane electroosmosis on alkali halide metal salt obtained in step (2) to obtain the hydroxide of alkali metal and the halogen hydride. According to the methods, the halogen ethyl alcohol or the ethylene oxide can be prepared at extremely high selectivity and yield, and the discharging of waste water and waste residues can be drastically lowered.

A screening method for heavy metal-resistant microorganisms, characterized in that: sequentially comprising the following steps: preparing a buffer solution, adding a heavy metal salt solution to the buffer solution, and then preparing buffer solutions containing heavy metal ions with different concentration gradients, and filtering to sterilize For later use, the buffer solution is a neutral inorganic salt buffer solution; the buffer solution containing heavy metal ions is mixed with the environmental sample to prepare an environmental sample suspension, and after mixing, incubate at a constant temperature of 20-40°C for 0.5-5 Hours, let the microorganisms in the environmental samples accept heavy metal ion immersion screening; after the immersion, carry out gradient dilution to the environmental sample suspension to obtain a dilution, transfer the dilution to a medium without heavy metal ions, and then cultivate to obtain a stable Resistant to heavy metal microorganisms. The method of the invention has the characteristics of quickness, simplicity, no interference to the culture medium, no selectivity, high recognition rate for heavy metal-resistant microorganisms, and sensitivity to non-heavy metal-resistant microorganisms.