52results about How to "Adjustable ratio" patented technology

The present invention relates to a recombinant microorganism for producing D(-) 2,3-butanediol, wherein a gene encoding an enzyme for converting acetoin into D(-) 2,3-butanediol is introduced into a microorganism having a pathway for converting acetoin into 2,3-butanediol. In addition, the present invention relates to a method for producing D(-) 2,3-butanediol by using the recombinant microorganism.

The invention belongs to the technical field of molten salt electrolysis, and in particular relates to a molten salt electrolysis method for preparing an aluminum-scandium intermediate alloy. The molten salt electrolysis method comprises the following steps: in a point charging type pre-baked anode molten salt electrolytic tank, by taking fluoride molten salt M3AlF6-AlF3 as a basic electrolyte system and taking aluminum oxide and a scandium-containing compound as raw materials, performing electrolysis in different cathode regions in the same electrolytic tank to dissolve out metal aluminum and metal scandium by adopting an independent charging mode, and alloying metal aluminum and metal scandium to obtain an aluminum-scandium intermediate alloy product of which the scandium content is 1.5-3.0% and the total mass percentage of aluminum and scandium is more than 99%. The aluminum-scandium intermediate alloy prepared by using the method disclosed by the invention is adjustable in component proportion, is suitable for additives of various scandium-containing aluminum alloys and other alloys, and ensures that the mechanical performance of the alloys can be significantly improved and the problems that aluminum oxide or the scandium-containing compound at the tank bottom is easy to participate and the electrolytic tank cannot be operated stably for a long time can be solved; and the method disclosed by the invention is low in production cost, high in automation degree and high in production efficiency.

The invention discloses a kind of baking fish meal fertilizer and its production method. The use of organic fertilizer makes for the alteration of the physical properties of soil, and provides the proper environment of the growing of beneficial microbios, the surviving of beneficial enzymes in soil and the various biochemical reaction process, and prevents the soil fertility deterioration. In the invention, the organic fertilizer is made up of fish meal and base fertilizer by fermenting.

The invention provides a new technology for co-production of dimethyl hexylenediol and diacetone alcohol, and belongs to the technical field of organic fine chemical preparation. According to the technology, methylbutynol and acetone serve as raw materials and are subjected to a reaction under the catalytic effect of alkali in a reaction solvent, then hydrolysis and layering are conducted, and theproducts dimethyl hexylenediol and diacetone alcoho are obtained after an upper-layer oil phase is washed for dealkalization, neutralized and rectified; lower-layer alkali liquor is recycled after catalyst regeneration, and water generated in the process is used for washing and hydrolysis. By means of the technology, co-production of the dimethyl hexylenediol and diacetone alcohol can be achieved, the total yield of the dimethyl hexylenediol and diacetone alcohol on the acetone is about 96%, the yield of the dimethyl hexylenediol on the methylbutynol is about 93%, and the mole ratio of the dimethyl hexylenediol to the diacetone alcohol is larger than 0.22 and is adjustable. By means of the technology, fixed investment and production cost can be effectively lowered, the added value of products, the utilization rate and the market resilience of devices are significantly increased, and the economic benefit increment is considerable.

The invention relates to a method for synthesizing boron carbide powder in high yield at low temperature. The method comprises the following steps: respectively measuring boric acid and polyvinyl alcohol according to a molar ratio of (4 to 7) : 10, mixing and stirring the boric acid and glycerol to be completely dissolved, adding alkali, adjusting the pH to 4 to 6, and obtaining a boric acid solution; mixing and stirring the polyvinyl alcohol and water to be completely dissolved, and obtaining a polyvinyl alcohol solution; mixing and stirring the obtained boric acid solution and the obtained polyvinyl alcohol solution, and heating and evaporating a solvent to completely form gel; drying the obtained gel to obtain dry gel; preserving the heat of the dry gel for 2 to 4 hours in a vacuum or inert atmosphere at the temperature of 500 to 700 DEG C, and carrying out the dissociation; preserving the heat of a dissociation product in a vacuum or inert atmosphere at the temperature of 1300 to 1500 DEG C for 3 to 5 hours, and carrying out the carbon thermal reduction for the dissociation product, and obtaining boron carbide powder. By adopting the method, the problems that B2O3 is severely volatilized and lost and the concentration of boric acid in a boric acid-polyvinyl alcohol system is extremely low in the subsequent process of gel of a boric acid-glycerol system are simultaneously overcome.

The invention discloses a method for manufacturing polyester staple fibers through recycled polyester bottles. The method comprises the following steps of: recycling waste polyester bottles, and performing crushing, cleaning, burdening, melt-extruding, spinning-extruding, drawing, drying, sizing and cutting on the recycled polyester bottles to obtain the polyester staple fibers. The production method disclosed by the invention not only saves natural resources, but also alleviates white pollution and protects the environment, thereby having good economic and social benefits, and the proportions of the raw materials can be adjusted to obtain products with given specifications. The product is a superior product according to the product grade of the textile raw material product standard of China, and is capable of replacing staple fibers produced by conventional production methods.