3 results about "Trace element composition" patented technology

The invention relates to a multi-scale precipitation strengthened wide-temperature-range high-toughness iron-based medium-entropy alloy and preparation and application thereof, and aims to solve the technical problems that the high-temperature strength of an existing iron-based medium-entropy alloy is insufficient, and the strength and the plasticity are difficult to consider at the same time. The alloy is prepared from the following components in percentage by atomic number: 46.6%-50.1% of Fe, 26.0%-30.0% of Ni, 5.0%-7.0% of Al, 2.0%-4.0% of Ti, 12.0%-14.0% of Cr, 0.5%-2.5% of Nb and 0-5% of trace elements. The alloy shows excellent obdurability matching in a wide temperature range of 77K-973K, particularly, the yield strength can reach 831-951 MPa at the high temperature of 973K, the ductility reaches 10-31%, and meanwhile, the alloy has good corrosion resistance; compared with a contrast which does not contain the Nb element, the alloy disclosed by the invention shows more excellent comprehensive strength and plasticity at low temperature, room temperature and high temperature. In addition, the cost of the alloy can be comparable with that of traditional steel, a component regulation window is wide, and huge engineering application potential is shown.

This invention discloses a trace element composition and its application for improving the fermentation efficiency of *Clostridium autoethanogenum* under conditions containing CO2 and H2 syngas, belonging to the field of microbial fermentation technology. The trace element composition comprises the following components: 1.5% nitroglycerin, 3% magnesium sulfate, 0.5% manganese sulfate, 0.1% ferrous sulfate, 0.18% cobalt sulfate, 0.1% calcium chloride, 0.18% zinc sulfate, 0.01% copper sulfate, 0.02% potassium aluminum sulfate, 0.01% boric acid, 0.01% sodium molybdate, 0.03% nickel chloride, and 0.004% sodium tungstate. Using the trace element composition of this invention, after 4 days of fermentation under conditions containing CO2 and H2 syngas (CO2:H2=1:2, CO-free), the cell concentration is nearly twice that of the control group without the composition, and the syngas utilization rate is significantly improved. This invention provides an effective technical solution to the problem of low fermentation efficiency of self-producing ethanol Clostridium in a pure CO2 and H2 system, and has good prospects for industrial application.

A stable trace element composition, its preparation method, and its use are disclosed. The trace element composition comprises a main material and auxiliary materials. The main material comprises pharmaceutical organic acid salts of iron, zinc, copper, and manganese, pharmaceutical salts of fluorine, iodine, selenium, and molybdenum, and a pharmaceutical organic or inorganic salt of chromium. The auxiliary materials comprise water for injection and a pH adjuster, which is an inorganic acid. The pH value of the trace element composition is 2.0 to 3.5. The amount of each trace element per 10 mL of the trace element composition is (unit: μmol): 17.8 to 21.5 μmol iron, 40 to 100 μmol zinc, 4.7 to 9.6 μmol copper, 1 μmol manganese, 25 to 60 μmol fluorine, 0.5 to 1.2 μmol iodine, 0.75 to 1.27 μmol selenium, 0.2 to 0.26 μmol molybdenum, and 0.2 to 0.4 μmol chromium.