6 results about "Bisulfide" patented technology

The invention discloses a portable fluorescence sensor for rapidly and intelligently detecting the content of sulfite in food and a preparation method thereof. The sensing chip has specific interaction with sulfite (bisulfite) through the molecular sensor LCMQ, changes of dual optical signals of color and fluorescence are generated, and the content of sulfite (bisulfite) in food is quantitatively detected through capture, recognition and analysis of a portable instant detection platform of a sensing chip-smart phone. The method has the characteristics of simplicity in preparation, low cost, high sensitivity, high selectivity, rapidness and readability, provides an intelligent and effective means for detection of sulfite (bisulfite) in food, provides powerful technical guarantee for self-monitoring and market supervision of food manufacturers, has great application prospects, and has great popularization significance.

The application discloses a preparation and application of a near-infrared ratio type bisulfite fluorescent probe, and relates to the technical field of bisulfite fluorescent probes. The probe comprises a near-infrared compound, and a structural formula is as follows: the preparation method and the application of the compound are also provided. The bisulfite ratio fluorescent probe can be reacted with bisulfite to generate a change in a fluorescence spectrum, so that quantitative detection of the bisulfite can be realized. The probe is very sensitive to the reaction with the bisulfite, so that the detection of the bisulfite is facilitated. The probe has good stability, and can be used for a long time. The bisulfite fluorescent probe is a high-selectivity and rapid-response bisulfite fluorescent probe, and is simple to synthesize.

The present disclosure is directed to a process for thiosulfate leaching of a precious metal-containing material and recovering a precious metal from a pregnant leach solution using a resin extractant. The precious metal is eluted from the loaded resin optionally using an eluant comprising trithionate. Various process improvements include maintaining the thiosulfate-containing leach solution substantially free of thiols and amines, maintaining a concentration of a sulfide in the thiosulfate leach solution of no more than about 100 ppm, recycling the barren resin free of contact with a sulfide, bisulfide, and polysulfide, and / or maintaining a concentration of tetrathionates, trithionates, sulfur-oxygen anions, and / or combinations thereof within about 50% of a concentration level of the one or more of tetrathionates, trithionates, sulfur-oxygen anions, the combinations thereof in the precious metal-containing solution before contact with the recycled barren resin.

The invention belongs to the technical field of petrochemical engineering, particularly relates to an ammonium hydrosulfide erosion simulation experiment device for a hydrocracking unit and a testing method, and designs the ammonium hydrosulfide erosion simulation experiment device and method for the hydrocracking unit. Through the structure of the patent, simulation test research can be carried out on flow erosion conditions of high-risk corrosion media such as ammonium sulfide and ammonium hydrosulfide in a high-pressure heat exchanger of a hydrocracking unit, and erosion simulation under specific conditions is realized by controlling key corrosion erosion parameters such as flow velocity, temperature, spraying angle and medium concentration; self-circulation erosion of a corrosion medium is achieved through a circulating pump, the inclination angle of a corrosion sample table is remotely and accurately controlled, the spraying center of a nozzle can be automatically calibrated, accurate testing of a metal sample at different spraying angles can be achieved, the corrosion rate can be calculated in real time through an ultrasonic thickness measuring probe, and the experiment efficiency is greatly improved.

The application discloses a data-driven dynamic risk and health degree evaluation method for pressure-bearing equipment and facilities, belongs to the technical field of risk evaluation of pressure-bearing equipment and facilities, and establishes a data-driven real-time dynamic risk and health degree evaluation model for petrochemical equipment and facilities, so that the current dynamic risk grade and health degree grade of the pressure-bearing equipment and facilities are calculated in real time. The model comprises a spheroidization mechanism k model, a graphitization mechanism k model, a high-temperature sulfur / naphthenic acid corrosion mechanism k model and an ammonium bisulfide corrosion mechanism k model. The failure possibility is dynamically corrected by introducing a failure possibility influence coefficient, so that the dynamic risk grade is obtained. The application applies the dynamic risk grade change, especially the change from a low-level risk to a high-level risk, so that the system can automatically give the influence factors of the increased failure possibility, and guide the operating personnel to reduce the operation risk of the pressure-bearing equipment and facilities by optimizing operation process parameters and the like, and ensure the operation safety and reliability of the equipment and facilities.