31 results about "Hydrogen sulfide synthesis" patented technology

The invention discloses a catalyst for catalyzing dimethyl sulfide and hydrogen sulfide to synthesize methyl mercaptan. In the catalyst, a catalytic active component is Gamma-alumina, a promoter is phosphotungstic acid, and the mass ratio of the phosphotungstic acid to the Gamma-alumina is (0.02-0.40):1. The invention also discloses a preparation method and application of the catalyst. According to the invention, the preparation method is simple, special equipment is not needed, and the industrial production is convenient; and the prepared catalyst can be used for catalyzing the dimethyl sulfide and the hydrogen sulfide to generate the methyl mercaptan, and has the advantages of high catalytic activity and high selectivity.

The invention relates to a hydrogen sulfide synthesis device, which comprises a sulfur evaporator and a hydrogen sulfide synthesis tower, wherein an electric induction heating device is arranged outside the sulfur evaporator; the sulfur evaporator is provided with a sulfur feed port, a hydrogen feed port and a sulfur steam and hydrogen mixed gas outlet; at least two sections of catalyst bed layers are arranged in the hydrogen sulfide synthesis tower; the hydrogen sulfide synthesis tower is provided with a sulfur steam and hydrogen mixed gas inlet and a synthetic gas outlet; the synthetic gas outlet is positioned on the lower part of the final section of the catalyst bed layer; and the sulfur evaporator and the hydrogen sulfide synthesis tower are connected with the sulfur steam and hydrogen mixed gas inlet through the sulfur steam and hydrogen mixed gas outlet. The hydrogen sulfide synthesis device provided by the invention has high liquid sulfur evaporation efficiency; the temperature of the device is easy to control; the synthesis reaction rate is high; and the device is convenient to start and stop.

The invention relates to an oxidic catalyst containing cesium and tungsten for the synthesis of alkyl mercaptans from alkanols and hydrogen sulfide, and to a process for the production of this catalyst, wherein the molar ratio of cesium to tungsten is <2:1.

The invention relates to a catalyst containing alkali tungstate for the synthesis of alkylmercaptanes from alkanols and hydrogen sulphide, in addition to a method for the production of said catalyst, wherein the molar ratio of alkali to tungstan is <2:1.

The invention relates to a halide-containing alkali tungstate catalyst for the synthesis of alkylmercaptans from alkanols and hydrogen sulfide, and to a process for the preparation of this catalyst.

The invention relates to a phenthiol synthesis method, in particular to a method comprising the following steps that in a high-pressure reaction vessel, hydrogen sulfide takes a contact reaction with chlorobenzene in a supercritical state, wherein the mol ratio of the chlorobenzene to the hydrogen sulfide is 1:1 to 1:10, the reaction temperature is 100 DEG C to 200 DEG C, the reaction pressure is 9 to 25 MPa, and the reaction time is 1 to 10 hours; after the reaction is completed, water is used for washing a reaction mixture; an oil phase is collected; reduced pressure distillation is performed; fraction (10mmHg, 47 to 49 DEG C) is collected; the phenthiol is obtained.

A novel chemical cycle for producing and capturing ammonia using nitrogen and hydrogen sulfide containing feedstocks is presented. An example of this cycle may start with the reaction between lithium nitride and hydrogen sulfide containing materials to form both lithium sulfide containing material and ammonia, where the produced ammonia is separated and captured. Metallic lithium may then be extracted high temperatures from said lithium sulfide containing material and then may or may not be separated from the said lithium sulfide containing material and other byproducts. The said extracted metallic lithium containing material may then be reacted with nitrogen containing feedstock to form lithium nitride containing material to complete the cycle.

The invention relates to a catalyst containing alkali tungstate for the synthesis of alkylmercaptanes from alkanols and hydrogen sulphide, in addition to a method for the production of said catalyst, wherein the molar ratio of alkali to tungstan is <2:1.

The invention relates to a method and a system for synthesizing carbon disulfide by plasmas. The method comprises the following steps that 1, hydrogen sulfide and methane are premixed; 2, mixed gas obtained in the first step is introduced into a plasma reactor; mixed gas is ionized for exciting the plasmas; 3, solid elementary substance powder in the product obtained in the second step is separated and collected; 4, CS2 and H2S in CS2 and H2S mixed gas obtained after the separation of the solid elementary substance powder in the third step are separated to obtain a CS2 product. The system comprises a premixing pipeline, the plasma reactor, a booster fan, a dust removal device, a CS2 adsorption collector and an H2S adsorption device which are in sequential connection. The method and the system have the advantages that the plasma technology is used; methane and hydrogen sulfide are used for synthesizing the carbon disulfide; compared with the process technology for preparing the carbon disulfide through natural gas and sulfur reaction in the prior art, the method has the advantages that the equipment investment and the energy source investment are low; the reaction conditions are wide; the reaction can be realized at normal temperature and pressure; the dangerous factors are greatly reduced, and the like.

The invention belongs to the technical field of medicine, and relates to application of a hydrogen sulfide synthetase inhibitor PAG in preparation of medicines for treating endometriosis (EMS). The invention evaluates the potential value of the hydrogen sulfide synthetase inhibitor PAG in the treatment of the EMS through experimental research; the results show that the expression level of hydrogensulfide synthetase CSE in the ectopic endometrium of a patient with the EMS is higher than that of the hydrogen sulfide synthetase CSE in normal endometrium, thus suggesting that hydrogen sulfide participates in the disease progression of the EMS; sodium hydrosulfide significantly promotes the proliferation of endometrial stromal cells (ESC), but the hydrogen sulfide synthetase inhibitor PAG significantly inhibits the growth of ectopic foci. The results prove that the hydrogen sulfide synthase inhibitor PAG can be used for the preparation of the medicines for treating the EMS. The invention provides a new pharmaceutical use of the hydrogen sulfide synthetase inhibitor PAG, thus providing a new method and a new idea for the clinical treatment of the EMS.

The invention relates to a method for synthesising a mercaptan from a terminal olefin and hydrogen sulphide which comprises the following consecutive steps: A—catalytic addition of hydrogen sulphide to a terminal olefin catalysed by an acid catalyst; B—separation of the products of the addition reaction into a light fraction including the surplus hydrogen sulphide and the olefins, and into a heavy fraction including at least one mercaptan and optionally one or more thioethers; C—a finishing step of passing the light fraction obtained in step B over an acid catalyst; then D—separation of the products of the finishing step into a fraction that is rich in hydrogen sulphide and into a fraction that is rich in additives; and finally E—recirculation of the fraction that is rich in hydrogen sulphide to the catalytic addition step A. The invention also relates to the facility for implementing said method.

The invention discloses a soil conditioner production process and relates to the technical field of soil conditioner production. The soil conditioner production process comprises the following steps:preliminary dewatering waste residues produced in a process of synthesizing thiourea from lime nitrogen and hydrogen sulfide until the moisture content is 40-45%, feeding into stirring equipment, andadding magnesium sulfate, zinc sulfate, copper sulfate, manganese sulfate and ferric sulfate powder particles, wherein the magnesium sulfate, zinc sulfate, copper sulfate, manganese sulfate and ferricsulfate respectively account for 0.5-2%, 0.5-2%, 1-3%, 1-2% and 1-3% of gross dry weight; adding noodle soup to regulate the moisture content to be 55-60%; preliminary dewatering waste residues produced in the process of synthesizing thiourea from lime nitrogen and hydrogen sulfide, drying and grinding, and adding sulfate of elements such as magnesium, zinc, copper, manganese and iron; starting ashaker cup type granulator for granulating; and delivering particles thrown from a discharging hole to a drying machine to be dried via a flexible pipeline. The invention further provides soil conditioner production equipment. The soil conditioner prepared in the invention is dense in particles and high in quality conformity.

The invention provides a post-treatment method of hydrogen sulfide. The method comprises chilling of hydrogen sulfide synthesis gas and backflow of hydrogen sulfide. According to the invention, by selecting a chilling tower, the generation of polysulfide is avoided, the post-treatment step of the polysulfide is simplified, and the liquefaction of sulfur entrained in the hydrogen sulfide synthesis gas can be realized in one step, wherein the purity of the prepared pure hydrogen sulfide reaches 99.95%, and the polysulfide is trace; liquid-state hydrogen sulfide is selected as a low-temperature medium, and other cooling mediums are not introduced, so that secondary treatment is avoided; and in the hydrogen sulfide liquefaction process, released heat can be recycled, and heating and heat preservation of solid sulfur or a hydrogen sulfide reactor, a reaction pipeline and the like are carried out.

The invention relates to pharmaceutical application of hydrogen sulfide synthase (CSE), in particular to application in preparation of drugs for treating aortic aneurysm and aortic dissection. The CSE adeno-associated virus improves the endothelial function and inhibits the onset of aortic aneurysm and aortic dissection. According to the invention, the effect of the hydrogen sulfide synthase CSE on endothelial injury caused by mechanical traction and prevention of aortic aneurysm and aortic dissection is defined. A new means is provided for treating the main aneurysm and the aortic dissection.

Improved methods of synthesizing ammonia from hydrogen sulfide and lithium nitrate are disclosed. Specifically, in a continuous cycle, hydrogen sulfide reactant is regenerated from the elemental sulfur that is extracted from a product of the ammonia synthesis, and the regenerated hydrogen sulfide is fed back into the ammonia synthesis reaction. The cycle that regenerates the hydrogen sulfide uses either a water-containing or a water and carbon-containing feedstock to facilitate the regeneration of the hydrogen sulfide from the elemental sulfur.

The invention discloses a catalyst used in synthesizing isopropanethiol from propylene and hydrogen sulfide and a preparation method of the catalyst. A carrier is aluminum oxide, metal components are Group VIB metals and Group VIII metals and the additive is a ZSM-5 molecular sieve. The catalyst is suitable for the reaction for synthesizing isopropanethiol from propylene and hydrogen sulfide, under the condition of more moderate operation, the conversion rate per pass of propylene can reach 85%, the selectivity of isopropanethiol is greater than 95% and the service life of the catalyst is 2 years.

The invention relates to a phenthiol synthesis method, in particular to a method comprising the following steps that in a high-pressure reaction vessel, hydrogen sulfide takes a contact reaction with chlorobenzene in a supercritical state, wherein the mol ratio of the chlorobenzene to the hydrogen sulfide is 1:1 to 1:10, the reaction temperature is 100 DEG C to 200 DEG C, the reaction pressure is 9 to 25 MPa, and the reaction time is 1 to 10 hours; after the reaction is completed, water is used for washing a reaction mixture; an oil phase is collected; reduced pressure distillation is performed; fraction (10mmHg, 47 to 49 DEG C) is collected; the phenthiol is obtained.

The invention relates to a preparation process of hydrogen sulfide. Hydrogen-rich gas is produced by directly taking ethanol / liquid ammonia as a hydrogen-containing raw material, and high-concentration hydrogen sulfide containing carbon dioxide (nitrogen gas) is synthesized; then, the hydrogen-rich gas is directly used for synthesizing the hydrogen sulfide. The defects of a traditional process that high-purity hydrogen gas is used as the raw material for producing the hydrogen sulfide, so that a hydrogen gas source is limited, the investment of equipment is great, and the operation cost is too high are eliminated.

The invention discloses a method for synthesizing isopropyl mercaptan from propylene and hydrogen sulfide. According to the method, a heat insulation type fixed bed reactor is used and isopropyl mercaptan is synthesized of hydrogen sulfide and propylene in the presence of a solid acid catalyst according to a continuous production process. The method disclosed by the invention has the advantages that the reaction conditions are easy to control, the yield is high, the process is simple, and the environmental pollution is reduced.

The invention belongs to the technical field of medicines, and relates to an application of a hydrogen sulfide synthase inhibitor AOAA (aminooxyacetic acid) to preparation of a medicine for treating endometriosis. The potential value of the hydrogen sulfide synthase inhibitor AOAA in treatment of EMS (endometriosis) is evaluated by experimental study, results display that the expression level of hydrogen sulfide synthase CBS in an ectopic endometrium of an EMS patient is higher than that of a normal endometrium, participation of hydrogen sulfide in the disease progression process is prompted,sodium hydrosulfide obviously promotes ESC (endometrial stromal cell) proliferation, and growth of an ectopic focus is remarkably inhibited by the hydrogen sulfide synthase inhibitor AOAA. The resultsindicate that the hydrogen sulfide synthase inhibitor AOAA can be used for preparing the medicine for treating the endometriosis. The new pharmaceutical application of the hydrogen sulfide synthase inhibitor AOAA is provided, and a new method and a new idea are provided for clinic treatment of the EMS.

The invention discloses a separation process for synthesizing mercaptoethanol by using hydrogen sulfide in crude gas, and relates to a new separation and purification process for synthesizing mercaptoethanol by utilizing hydrogen sulfide in crude gas. The obtained mercaptoethanol is mainly used for telogen such as polyvinyl chloride, polyacrylonitrile, polystyrene and the like. In the separation process, a rectifying tower, a condensation cooler, a front fraction tank, a finished product tank, a buffer tank and a vacuum unit are mainly involved. The process comprises the following steps of: adding a liquid crude product mercaptoethanol with content of about 90 percent into a tower kettle of the rectifying tower, and starting the vacuum unit, the buffer tank, a tower kettle heater and a tower top condenser; and heating the tower kettle of the rectifying tower slowly and continuously, when the vacuum degree of a system is more than or equal to 0.095 MPa and the temperature of the tower kettle reaches 150 DEG C, boiling and gasifying the liquid mercaptoethanol in the tower kettle of the rectifying tower, totally refluxing by the condensation cooler for a certain time, and extracting a finished product at the constant tower top temperature of about 70 DEG C and feeding into the finished product tank. The process is simple, and low in production cost, the product is high in quality and purity; and through detection, the mercaptoethanol content of the product is more than or equal to 99 percent.