48results about How to "Low content requirement" patented technology

The invention discloses a method for preparing ethanol by hydrogenation of acetic ester. The method comprises the following step of: hydrogenating the acetic ester at the reaction temperature of between 180 and 300 DEG C under the reaction pressure of between 1.0 and 5.0 MPa in the presence of a reducing and activating copper-based catalyst to generate the ethanol, wherein the copper-based catalyst takes Cu as an active ingredient, SiO2 as a carrier and at least one of transition metal or / and alkali metal as an aid. The method has high space-time yield, high ethanol selectivity, a simple process and low cost, is environmentally-friendly, and contributes to industrial production.

The invention belongs to the technical fields of metal materials and metallurgy, relates to an amorphous alloy material, and particularly relates to a zirconium-based amorphous alloy and a preparation method thereof. By adjusting the atomic percentage content of each component in the zirconium-based amorphous alloy and adding nonmetallic elements Y and Sc into the zirconium-based amorphous alloy, the preparation requirement on the amorphous alloy can be lowered; more importantly, on the premise of not reducing the comprehensiveness, the high requirement on the purity of raw material is greatly lowered while a certain quantity of impurity elements can be allowed to be reserved in the raw material. Therefore, by properly adjusting the proportion of the nonmetallic elements such as Si and C in the amorphous alloy, the comprehensive performance of the zirconium-based amorphous alloy is not influenced, and the stress on the raw material cost can be reduced in industrial batch production. Through the preparation method provided by the invention, a large zirconium-based amorphous alloy with critical dimension of over 3mm can be obtained; the zirconium-based amorphous alloy has excellent mechanical property, and the requirement on the purity of raw materials and the content of impurity elements is low.

The invention discloses a catalyst used in the preparation of ethanol through hydrogenation of acetate and a preparation method thereof. The catalyst uses Cu as an active component, SiO2 as a carrier and at least one selected from the group consisting of transition metal and alkali metal as an auxiliary agent. The copper-based catalyst provided in the invention has good stability and high activity, and has a low requirement for the content of the active component Cu, which only needs to be more than 15%. The preparation method provided in the invention has the advantages of simple operation, low cost and environment-friendliness and is benefit for industrial production.

The invention discloses a method for preparing ethanol by hydrogenation of acetic ester. The method comprises the following step of: hydrogenating the acetic ester at the reaction temperature of between 180 and 300 DEG C under the reaction pressure of between 1.0 and 5.0 MPa in the presence of a reducing and activating copper-based catalyst to generate the ethanol, wherein the copper-based catalyst takes Cu as an active ingredient, SiO2 as a carrier and at least one of transition metal or / and alkali metal as an aid. The method has high space-time yield, high ethanol selectivity, a simple process and low cost, is environmentally-friendly, and contributes to industrial production.

The invention relates to a plate cavity-type heat exchanger which is provided with a plurality of heat exchange units clamped between two pressure plates (1); each heat exchange unit is respectively provided with two opposite wave plates (3) with wavy cross section; bifarius surfaces of the two wave plates are respectively opposite to water plates (2) on the corresponding sides; the water plates are provided with a plurality of horizontal water plate wave troughs (21) which are vertical to longitudinal wave plate wave troughs (31) on plane surfaces opposite to the wave plates, and a pluralityof longitudinal pressure bearing strips (22); all the pressure bearing strips respectively correspond to the trough parts of the wave plate wave troughs; a cavity frame (4) is arranged between the two water plates; the front side and the rear side of the side frame of the cavity frame are respectively inlaid in the water plates (2, 6) on the corresponding sides, and respectively seal and press the periphery of the wave plate (3) on the corresponding side to the corresponding water plate through the side frame; and the invention can improve the pressure bearing capability of the heat exchangerand reduce the pressure bearing requirement on the heat exchange wave plates, the size of the working substance cavity can be designed on demand, and the problems that impurities block a runner and the like can be overcome by enlarging the cross section of the heat carrying runner.

The invention relates to a continuous production process of 3,6-dichlorosalicylic acid, and belongs to the technical field of the synthesis of a herbicide dicamba intermediate. A specific continuous production process and a specific continuous production system are adopted, harsh requirements on the water content of a reaction system can be lowered, coking is reduced, equipment investment cost is lowered, efficiency is high, and continuous production is realized. The process disclosed by the invention lowers the harsh requirements on the water content of the reaction system, can meet reaction requirements if the water content is below 2000ppm, and has the advantages of high once through yield, high selectivity and little coking. When the process disclosed by the invention is adopted, the yield is above 55%, and the selectivity is above 96%.

The present invention relates to a kind of production method of the carbon black with electromagnetic shielding property, described production method comprises the following steps: (1) configure raw material oil: add peroxide and ferrocene or derivatives thereof in raw material oil, configure Reaction raw materials; (2) Spray the configured raw material oil into a high-temperature reaction furnace for carbonization treatment, and the carbonization temperature is 1700-1850°C; (3) After the carbonization is completed, pass through quenching water for quenching treatment to generate carbon black and collect carbon Black, the final product is obtained after drying. The electromagnetic shielding effect of the carbon black product prepared by the invention is good. At the same time, cheap and easy-to-obtain raw materials and simple production operations enable the product to be industrially produced in large quantities.

The invention discloses biodiesel for coal flotation and a preparation method of the biodiesel and belongs to the technical fields of utilization of waste oil, preparation of biodiesel and preparation and application of coal flotation agents. The biodiesel is characterized in that the content of fatty acid methyl ester in the biodiesel is higher than 63%, the content of fatty acid monoglyceride is lower than 25%, the content of diglyceride is lower than 10%, and the content of triglyceride is lower than 2%. The preparation method comprises the steps that waste oil serves as a raw material, SO42 is loaded through mesopore silicon oxide, mesopore zirconium oxide or porous zirconium oxide, the biodiesel is obtained by catalytic esterification, and the biodiesel can serve as a flotation agent used in coal flotation. The waste oil serves as a raw material in preparation of the biodiesel. The biodiesel is used in the coal flotation, the production cost of the flotation agent can be reduced greatly, a new purpose of the biodiesel is developed, and the biodiesel is non-toxic and innocuous, capable of degrading biologically and is an effective coal flotation agent.