31results about How to "Low commercial price" patented technology

The invention provides a preparation method of 2, 3, 3, 3-tetrafluoropropene, which comprises the following steps: taking monochlorodifluoromethane (R22) and methane chloride (methyl chloride) as raw materials and carrying out thermal cracking reaction at a high temperature of 600-1000 DEG C under the condition that N2 exits to prepare the 2, 3, 3, 3-tetrafluoropropene, wherein the volume ratio of the monochlorodifluoromethane to the methane chloride is 1-3:1, and the retention time of a reactant is 0.01-0.2 seconds. The reaction raw material used in the preparation method is easy to obtain, the defect of high cost of the used raw material in the prior art is overcome, the production cost is greatly reduced, and the reaction process is simple. The prepared 2, 3, 3, 3-tetrafluoropropene has the advantages of zero ODP and low GWP and can be used as a substitute of an automotive air-conditioning refrigerant.

The invention relates to a low-alkali silicic acid reaction expanded high-doping amount waste pulverized glass self-compacting concrete preparation method. According to the invention, a natural chitinhigh polymer is subjected to degradation, deacylation, carboxylation, and intramolecular dehydration, and is modified to a low molecular weight polylactic acid base silicic acid reaction inhibitor; awaste pulverized glass fine aggregate covered by the polylactic acid base silicic acid reaction inhibitor is used to replace s river sand fine aggregate into the self-compacting concrete, and the low-alkali silicic acid reaction expanded high-doping amount waste pulverized glass self-compacting concrete is prepared. the addition of polylactic acid effectively inhibits the alkali silicic acid reaction in the high-doping amount waste pulverized glass self-compacting concrete. The high-doping amount waste pulverized glass self-compacting concrete has better working performance and durability performance and good volume stability than that of the traditional self-compacting concrete, which expands the application range of waste glass and can produce good technical, economic, social and environmental benefits.

The invention relates to a quantitative determination method for general chlorantraniliprole residual quantity. The method is characterized in that residual chlorantraniliprole in a test sample is subjected to ultrasonic extraction by an acetonitrile solvent, a proper amount of MWCNTS and PSA adsorbents are used for removing impurity, a supernatant is subject to nitrogen blowing and concentrating until nearly dry; volume metering is carried out by using an acetone-hexane mixed solvent with volume ratio of 1:1, a HP-5 chromatographic column program is used for heating and separating, electron capture detector ECD detection is carried out, and a matrix external standard method is used for quantification. Through test, the method has the advantages of simple, fast and accurate operation, easy popularization and grasping, low cost, is the rapid and reliable method for detecting the residual chlorantraniliprole in different samples, and can satisfy the quality and progress requirement by analysis of large-batch samples.

The invention provides a preparation method of 2, 3, 3, 3-tetrafloropropylene. The method comprises the following steps: with monochlorodifluoromethane and monochloro methane which are in a molar ratio of (0.5-4):1 as reaction raw materials, preheating the reaction raw materials, then mixing with superheated steam, wherein the volume ratio of the superheated steam to the reaction raw materials is (1-20):1, the temperature of the superheated steam is 900-1100 DEG C, the temperature in the reaction section is 600-1100 DEG C, and the stay time of reactants in the reaction section is 0.01-1s; and quenching, deacidifying, drying and rectifying and separating the product mixed flow to obtain 2, 3, 3, 3-tetrafloropropylene. The method provided by the invention overcomes the deficiency that a hollow tube is prone to carbonization in pyrolysis and side reactions are complex, the equipment maintenance rate is reduced, and meanwhile, the reaction period is prolonged, and the utilization ratio of the device is improved. The method provided by the invention has the characteristics of use of easily available raw materials, simple reaction process and the like. The obtained 2, 3, 3, 3-tetrafloropropylene has the advantages of zero ODP (Ozone Depletion Potential) and low GWP (Global Warming Potential), and is used as a substituent of automotive air conditionor refrigerant.

The invention discloses a preparation method of a saxagliptin intermediate compound. The method comprises the following steps: in an ether organic solvent, in the presence of an acid, under the catalysis of cuprous catalyst and zinc powder, react compound I with dibromomethane. The preparation method has low cost, less environmental pollution and simple operation, and can be applied to industrialized industries.

The invention relates to black gingko nut health food and a making method thereof. The health food is made by enabling pure gingko nut to self-ferment under the condition that the temperature is 60 to 65 DEG C and the humidity is 85 to 100% for 8 to 10 days and then taking out the gingko nut to be placed at a cool and ventilated place for 1 to 2 days. The black gingko nut self-ferments, has a simple process, is easy for batch production, saves the production cost, and can effectively reduce market sale price, so as to benefit the customers. The making method of the black gingko nut health food is carried out by self-fermenting under the condition of constant temperature, the fermentation accelerates the nutriment conversion of the gingko nut, the total amino acid and the total sugar are increased, and health food tastes sweet, is light in flavor, is antioxidant and strengthens the immunity.

The invention provides a quantitative detection method for the residual quantity of chlorantraniliprole in the soil. The method is characterized in that the ultrasonic extraction of residual chlorantraniliprole in the soil is conducted in an acetonitrile solvent, and then impurities are removed by adopting a proper amount of MWCNTS and PSA adsorbent. An obtained supernate is subjected to nitrogen-blowing, concentrating and drying, and then the volume is metered by adopting an acetone and n-hexane mixed solvent, wherein the volume ratio of acetone to n-hexane in the mixed solvent is 1:1. After that, the obtained mixture is subjected to programmed warming and separating by adopting a HP-5 chromatographic column, and the ECD determination is conducted by an electronic capture detector. Finally, the residual quantity of chlorantraniliprole is quantitatively detected based on the matrix external standard method. Experiments prove that, the above method is simple, rapid and accurate in operation, easy to popularize and master, and low in cost. Therefore, the method provides a rapid and reliable method for the residual quantity measurement of chlorantraniliprole in the soil, and the requirements of the batch sample analysis on quality and progress can be met.

The invention discloses a method for preparing a titanium oxide nanoparticle / multilayer graphene composite material. Nano-titanium oxide particles are used as raw materials, and nano-titanium oxide is added to a mixed solution of DMF and water, and dilute nitric acid solution is added. Under the condition of water bath at ℃, organic functional groups are generated on the surface of nano-titanium oxide, and nano-titanium oxide is uniformly deposited on the surface of multi-layer graphene through the molecular force on the surface of multi-layer graphene, and finally uniform composite titanium oxide nanoparticles / multi-layer graphene are obtained composite material. The preparation process of the invention is simple and suitable for industrialized production.