43results about How to "Raise the initial concentration" patented technology

Belonging to the technical field of environmental governance, the invention particularly relates to a method of refractory pollutant effective bacterium culture by a 96-pore microwell plate, thus realizing high throughput and rapid screening of strains. The method comprises: culturing a lot of single strains isolated from a strain mixture on the microwell plate, and judging the metabolic process and pollutant degradation ability of the strains by dye (MTT or XTT) developing, thus screening out strains with a strong pollutant degradation ability. Compared with the traditional strain screening methods based on shake flask culture, the method has the outstanding advantages of less agent (including microbial inoculums) consumption, short culture period, simple equipment, small experimental space occupation, and small experimental workload, etc. By applying the method, high throughput rapid detection of mass strains can be realized, the strain screening time can be substantially shortened, and the strain screening efficiency is significantly increased.

The invention belongs to the field of chemical engineering and relates to a preparation method of hydroxylamine sulfate. In the preparation method, sulfuric acid and ketoxime are employed as raw materials for producing the hydroxylamine sulfate in a reactive rectification system. The preparation method includes the steps of: (1) adding a sulfuric acid solution and ketoxime to the reactive rectification system to perform reactive rectification; (2) successively withdrawing a distillate from the column top of the reactive rectification system, when concentration of the hydroxylamine sulfate in the reaction liquid reaches 2-8.5 mol / L, performing crystallization and filtration at the same time; and (3) reducing the temperature of the reaction liquid and performing crystallization and filtration. The method for producing the hydroxylamine sulfate is greatly reduced in production energy consumption and achieves zero-emission of process wastewater.

The invention relates to a method for enzymatic liquefaction of high-concentration cornstarch, which belongs to the technical field of liquefaction in cornstarch sugar production. Prepare starch milk with a concentration of 50% in the mixing tank with water at 40°C-50°C and first-grade starch, and add high-temperature-resistant α-amylase; then pump the starch milk from the mixing tank to the heat preservation liquefaction tank , use steam to heat in the jacket, stir, and use a jet liquefier for jet liquefaction. The advantage is that increasing the initial concentration of starch milk can reduce water consumption, thus reducing steam consumption during liquefaction. The liquefied sugar solution has a high concentration, which can reduce the amount of evaporated water during evaporation and concentration, thereby reducing the evaporation steam consumption. The invention has simple process and easy operation, and is suitable for industrial production and application.

The improved wet process of producing fuel ethanol includes soaking purified corn in centrifugal clear liquid from the ethanol producing process inside soaking tank at 60-65 deg.c for 4-12 hr; returning the soaked dilute corn slurry into ethanol produce step for producing DDGS, twice crushing soaked corn and twice plumule separation to obtain corn powder slurry, diastatic fermentation, distillation and dewatering to obtain absolute ethanol alcohol, and washing and drying the separated plumule for further oil squeezing. The process is simple, short and low in cost and can separate corn plumule for raised economic utility.

The invention discloses a method for recovering sodium carbonate from a sodium tungstate leaching solution, andbelongs to the field of resource recycling.Aiming at a feature that a concentration of WO3 in the sodium tungstate leaching solution is lower generally, the method comprises the following steps of: firstly, concentrating the sodium tungstate leaching solution, improving an initial concentration of Na2CO3 in the solution as much as possible to improve a crystallization rate of the sodium carbonate in a freezing crystallization process, and simultaneously ensuring a proper initial concentration of WO3 to prevent the sodium tungstate from crystallizing together with the sodium carbonate.By the adoption of the method for recovering the sodium carbonate from the sodium tungstate leaching solution,a direct freezing crystallization method is combined with an NaHCO3 crystallization method, most of sodium carbonate crystal are recovered by the direct freezing crystallization method, thereby reducing the consumption of subsequently-injected CO2 and neutralization time of ventilation, meanwhile, further improving a total recovery rate of the sodium carbonate through the NaHCO3 crystallization method, and covering the shortage of low recovery rate of the direct freezing crystallization method; and aiming at the feature that temperature-lowering is slow in a later period in a cooling and temperature-lowering process, crushed ice blocks are directly added to dissolve and rapidly lower the temperature, thereby greatly improving the productioneffectiveness.