38results about How to "Low total production cost" patented technology

The invention is directed at the field of chemical engineering and provides a cheap preparation method for high purity D,L-methionine. The preparation method comprises the following steps: preparing a hydrocyanic acid gas mixture by using an Andrussow process; fully reacting the hydrocyanic acid gas mixture with methylthiopropionaldehyde under the catalysis of base so as to prepare a 2-hydroxy-4-methylthiobutyronityile system; reacting the 2-hydroxy-4-methylthiobutyronityile system with ammonia under the conditions of heating and pressurization and carrying out pressure reduction and deamination so as to obtain 2-amino-4-methylthiobutyronityile; and subjecting 2-amino-4-methylthiobutyronityile to acidolysis with inorganic acid so as to obtain D,L-methionine. According to the invention, raw materials used in the method are cheap and easily available, the intermediate 2-hydroxy-4-methylthiobutyronityile has stable properties, prepared 2-amino-4-methylthiobutyronityile has high yield and high purity, and D,L-methionine obtained after continued production has the advantages of high yield, high purity, great bulk density and low total production cost.

The invention relates to a comprehensive recovery method for zinc, nickel and cobalt-containing purification slag. The method comprises the following steps: washing the zinc, nickel and cobalt-containing purification slag with hot water till the content of sulfate radicals or chlorine ions of a lotion is smaller than 1g / L and then leaching the purification slag with sodium hydroxide; obtaining zinc and cobalt-containing alkaline leaching liquor and leached slag primarily containing nickel; putting the alkaline leaching liquor in a magnetic field and performing diaphragm electrolysis by takinga magnetic material as an anode and a stainless steel plate as a cathode to obtain metal zinc powder in a cathode region and the cathode and anode slurry primarily containing Co2O3 and Co3O4 in an anode region and the anode; washing and drying the anode slurry, reducing the same directly with hydrogen to obtain metal cobalt powder or sulfuric acid leached out, precipitating oxalic acid to obtain cobalt oxalate, then reducing the cobalt oxalate with hydrogen to obtain metal cobalt powder, and electrolyzing metal cobalt; returning the alkaline residual electrolyte to leach zinc, nickel and cobalt purification slag; and washing the nickel-containing leach residue and leaching the same with sulfuric acid, and enriching the same and performing electrolysis to obtain metal nickel. The method provided by the invention is short in process flow, high in separating recovery rate of zinc, nickel and cobalt and small in wastewater and waste residue amount.

The invention is directed at the field of chemical engineering and provides a preparation method for calcium D,L-2-hydroxy-4-methylthiobutyrate. The preparation method comprises the following steps: preparing a hydrocyanic acid gas mixture by using an Andrussow process; preparing a 2-hydroxy-4-methylthiobutyronityile system with the hydrocyanic acid gas mixture and methylthiopropionaldehyde as starting raw materials; hydrolyzing the 2-hydroxy-4-methylthiobutyronityile system with inorganic base so as to obtain D,L-2-hydroxy-4-methylthiobutyrate; and chelating D,L-2-hydroxy-4-methylthiobutyrate with a soluble calcium salt so as to produce calcium D,L-2-hydroxy-4-methylthiobutyrate. The method has the advantages of a few processing step, cheap and easily available raw materials, stable intermediate properties and low total production cost. Prepared calcium D,L-2-hydroxy-4-methylthiobutyrate has the advantages of high yield, high purity, a powder crystal form and great bulk density, can be used as an animal feed additive for effective mixing with a feed so as to supplement trace elements and amino acid in daily ration and improve production performance and immune performance of animals and can also be used as a medicine reagent.

The invention belongs to the technical field of chemical industry, and particularly relates to a technique for synthesizing zinc stearate from glyceryl tristearate. The technique comprises the following steps: 1) hydrolyzing glyceryl tristearate and water under the actions of a catalyst and an antioxidant; and 2) adding zinc oxide and a catalyst in multiple steps, and carrying out condensation, dewatering and salification to synthesize the zinc stearate. By using the technique provided by the invention, no wastewater containing chlorine and sulfate ions is discharged in the process; the production process is safe and environment-friendly and has low total production cost; and the synthesized zinc stearate has the advantages of high yield, favorable color and low free fatty acid content, satisfies the relevant quality standard for Type I zinc stearate in HG / T3667-2012, and has higher practicality and comparability than like products in the market in practical application.

The invention belongs to the technical field of chemical engineering, and particularly relates to high-quality zinc stearate prepared from glyceryl tristearate. A preparation technology of zinc stearate comprises the following steps that 1, glyceryl tristearate and water are hydrolyzed under the action of a catalyst and an antioxidant; 2, zinc oxide and a catalyst are added stepwise, condensing, dewatering and salt forming are conducted, and zinc stearate is synthesized. Zinc stearate is high in preparation yield, good in color and cluster, low in free acid content and stable in quality, and the related quality indexes meet the related requirements on I type zinc stearate in HG / T3667-2012; in addition, no wastewater containing chlorine and sulfate ions is discharged in the preparation process of zinc stearate, the production process is safe and environmentally friendly, and the total production cost is low. Zinc stearate is high in quality and has the better practicability and comparability compared with similar products on the market in practical application.

The invention discloses a strain of bacillus licheniformis with high protease production and a method for fermenting and producing the enzyme. The Bacillus licheniformis GZ73 provided by the present invention is referred to as Bacillus licheniformis GZ73 for short, and the preservation number is CGMCC No.18048. The invention also protects the application of Bacillus licheniformis GZ73 in the production of protease. The protease is prepared by fermenting Bacillus licheniformis GZ73, which has high enzyme production efficiency, low raw material cost, high enzyme activity of fermented liquid, high yield of enzyme extraction and purification process, and low total production cost. The enzyme preparation provided by the invention can be widely used in industries such as feed, food, detergent and the like.