8 results about "Hydrogen sulfide" patented technology

The invention discloses a hydrocracking method for processing a low-sulfur raw material. The method comprises the steps of: hydroprocessing a high-sulfur raw material, and performing gas-liquid separation on a reaction effluent to obtain sulfur-containing hydrogen-enriched gas; hydrocracking low-sulfur raw oil, and performing gas-liquid separation on a reaction effluent to obtain a low-sulfur hydrogen-enriched gas; and mixing the sulfur-containing hydrogen-enriched gas and the low-sulfur hydrogen-enriched gas, selectively performing hydrogen sulfide removal treatment on the gas mixture, and circulating the treated gas mixture to a reactor inlet. According to the invention, two paths of hydrogen-enriched gas of the hydroprocessing process and the hydrocracking process are effectively combined, and the sulfur-containing hydrogen-enriched gas subjected to hydroprocessing is fully utilized to replenish sulfur for a low-sulfur raw material hydrocracking device, so that the problem of sulfur loss of the catalyst during long-term operation of the low-sulfur hydrocracking device is effectively solved. The hydrocracking method disclosed by the invention has the advantages of simplified process flow, low operation cost, low total investment and the like.

The invention discloses an inorganic sensitive layer based surface enhanced Raman spectrum detection technology and material preparation thereof. According to the detection technology, a surface enhanced Raman spectrum material based on an inorganic sensitive layer is used as an active substrate of a surface enhanced Raman scattering, and is exposed in the small molecule atmosphere; a new solid substance formed by specific reaction of the inorganic sensitive layer and small molecules to be detected by a Raman spectrometer is detected, and the type of the small molecules is obtained according to the Raman spectrum of the new solid substance; according to the preparation method, a colloid electrostatic self-assembly method, a thiourea-induced isotropic shell growth method, a metal halogenation method and a physical deposition method are used for a precious metal nanoparticle colloidal solution, a metal salt solution and a thiourea solution to prepare the material in which precious metalnanoparticles are coated with a metal oxide layer, or the precious metal nanoparticles are coated with a metal sulfide layer, or the precious metal nanoparticles are coated with a metal halide layer.The technology can be used for real-time online detection of hydrogen sulfide, carbon disulfide, hydrogen chloride, mustard gas, nitrogen dioxide and the like.

The invention discloses composition for reductive soil sterilization and an application of the composition. The composition comprises a cellulose degradation compound microbial agent formed by flavobacterium johnsoniae and pseudomonas fluorescens and further comprises corn stalk. The composition can change the microflora structure of soil and promote the corn stalk to degrade in the anaerobic environment to produce ammonia, methane, organic acid, hydrogen sulfide and other substances which have poisonous effects on fusarium oxysporum. By means of the composition, 99.9% of fusarium oxysporum can be killed, and 97.0% of pathogenic bacteria can still be killed in the dry period. Besides, the composition can notably improve the physical and chemical properties of soil, can effectively relievesecondary salinization of the soil, further can be used for controlling tomato wilt and has an improvement effect.

The invention discloses a technology for preparing low-carbon alcohol from syngas and coke oven gas. The technology comprises the following steps: mixing coke oven gas and syngas to form crude raw material gas for low-carbon alcohol synthesis; washing the crude raw material gas by low temperature methanol to remove the impurities such as hydrogen sulfide, carbon dioxide, and the like to produce purified gas for low-carbon alcohol synthesis, recycling the removed hydrogen sulfide after the sulfur is removed, discharging carbon dioxide into the sky; subjecting the purified gas to low-carbon alcohol synthesis, separating the synthesis products, which are in a gas phase and a liquid phase, to obtain a gas product, which is mainly composed of CO, H2 and CO2, and a liquid product, which is a mixture of alcohol and water, subjecting the gas product to the low temperature methanol washing and circulation, combusting the other part of gas product in a torch as exhausted gas or discharging the gas product; and separating the alcohol from the liquid product so as to obtain the low-carbon alcohol product. The technology can obtain a plurality of products, can reduce the excessive production capacity, promote the energy saving and discharge reducing, and adjust the energy structure.

The invention discloses a preparation method of a tungsten disulfide single crystal with a controllable layer number. According to the preparation method, hydrogen sulfide is taken as a sulfur source,and micro-patterning on a precursor WO3 is carried out in advance to accurately regulate and control the amount of the precursor, thereby realizing controllable preparation of single-layer, double-layer, three-layer and multi-layer WS2 single crystals. The method provided by the invention has the advantages of few required raw materials, high yield and good repeatability, and the obtained crystalhas high quality and high electron mobility, and is especially suitable for preparation of large-area uniformly-distributed WS2 single crystals with controllable layer number.

A process is disclosed for the removal of hydrogen sulfide (H2S) from natural. This process provides for passing a natural gas feedstream comprising H2S though a regenerable adsorbent media which adsorbs H2S to provide an H2S-lean natural gas product and H2S. The regenerable adsorbent media of the present invention is a cross-linked macroporous polymeric adsorbent media

The invention provides a fruit and vegetable waste anaerobic fermentation substrate efficient treatment method. The method comprises the following steps of: S1, conducting solid-liquid separation on afruit and vegetable waste anaerobic fermentation substrate capable of normally producing biogas through a solid-liquid separation device, with the separated biogas slurry water insoluble substances being lower than 50g/L; S2, collecting the biogas slurry subjected to solid-liquid separation into a first aeration device through a pipeline, and after collection of the first aeration device is completed, further collecting the biogas slurry subjected to solid-liquid separation into a second aeration device through a switching valve; meanwhile, starting the first aeration device for aeration through an aeration control system, wherein the aeration rate is that the volume ratio of minute ventilation volume to biogas slurry is 1:3.5-6, thus further degrading organic matters which are not completely degraded in the biogas slurry under an anaerobic condition, removing harmful substances like methane, hydrogen sulfide, sulfur dioxide and the like in the biogas slurry, and killing anaerobic bacteria and other harmful microorganisms. Suspended matters, impurities, heavy metals and other harmful substances in the biogas slurry are reduced, and meanwhile, nutritional ingredients required by crops in the biogas slurry are reserved.

The invention discloses a liquid ammonia production method which comprises the following steps of: (A) performing three-level segregation of crude ammonia gas to remove most of water and hydrogen sulfide therein, wherein the conditions of the three-level segregation are as follows: the temperature of the first-level segregation is 120-200 DEG C, and the pressure after the segregation is 0.6-2.0MPa; the temperature of the second-level segregation is 90-150 DEG C, and the pressure after the segregation is 0.55-1.5MPa; and the temperature of the second-level segregation is 30-70 DEG C, and the pressure after the segregation is 0.5-1.0MPa; (B) cooling the segregated ammonia gas to (-30)-20 DEG C to convert the ammonia gas into liquid ammonia; (C) increasing pressure of the liquid ammonia to 1.3-3.0MPa; and (D) removing water and hydrogen sulfide of the liquid ammonia in a desulfurization dehydrator at the same time, wherein the operation temperature of the desulfurization dehydrator is (-30)-50 DEG C, and the operation pressure is 1.3-3.0MPa. The invention provides a new liquid ammonia production method. An ammonia compressor is not used in the production process, the production process is safer and more reliable, and secondary pollution to the liquid ammonia is avoided.