54 results about "Carbon tetrachloride" patented technology

The present invention relates to a Ru-Ni bimetallic catalyst for the selective hydrogenation of a quinoline organic hydrogen storage carrier, and a preparation method therefor and the use thereof. In the catalyst, carbon nitride is used as a carrier, and metal nanoparticles Ru and Ni serve as active components and are jointly loaded on the carbon nitride carrier; and the carbon nitride is prepared by mixing carbon tetrachloride, ethidene diamine and nano-silica, reacting same to obtain a carbon nitride polymer, then calcining same at 750-850ºC, performing a desilicification treatment, and then filtering and drying same. The catalyst provided in the present application has good catalytic hydrogenation performance in the selective hydrogenation of the quinoline organic hydrogen storage carrier and can achieve the omission of a solvent in a reaction system; the reaction is simple, green and environmentally friendly, and the gravimetric hydrogen storage density of the system can be maximally ensured when a quinoline compound is used as an organic hydrogen carrier; moreover, the catalyst also has a good cycling stability.

The invention relates to the technical field of refrigerant raw material preparation, and discloses a novel energy-saving environment-friendly refrigerant raw material preparation system which comprises a raw material preparation and supply unit, a reaction and separation unit and a refining unit which are connected in sequence, the reaction and separation unit comprises a mixer, a reflux device, a reactor, a cooling separation device, a membrane type absorption device and a tail gas tower which are connected in sequence; the refining unit comprises an azeotropic tower, a rectifying tower I and a rectifying tower II which are connected in sequence, and is used for performing dehydration, deacidification and rectifying purification on the separated crude chlorinated liquid to obtain a high-purity carbon tetrachloride product; by optimizing the technological process of the raw material preparation and supply unit, the reaction and separation unit and the refining unit, efficient, environment-friendly and energy-saving production of carbon tetrachloride is realized; the problem that the production raw material carbon tetrachloride of the fourth-generation refrigerant is insufficient is solved, the production cost is reduced, and the production efficiency is improved.

The invention provides a pharmaceutical composition for treating liver injury and hepatic fibrosis, and relates to the technical field of biological medicines. The pharmaceutical composition is prepared from a peucedanum decursum extract, a penthorum chinense pursh extract, a spanishneedles herb extract and a nux prinsepiae extract. The pharmaceutical composition shows an excellent protective effect on a carbon tetrachloride induced hepatocyte injury model. The pharmaceutical composition disclosed by the invention has obvious treatment and protection effects on carbon tetrachloride induced rat hepatic fibrosis, and the anti-hepatic fibrosis effect is realized by improving four indexes of liver function and hepatic fibrosis, reducing the level of inflammatory factors in the liver and relieving inflammatory reaction in the hepatic fibrosis process. The pharmaceutical composition disclosed by the invention is expected to be further developed and popularized as a medicine for treating liver injury and hepatic fibrosis.

The application belongs to the technical field of two-dimensional material preparation, and particularly relates to a preparation method of a transition metal sulfide two-dimensional material. The preparation method provided by the application comprises the following steps: taking a transition metal sulfide as a target material, taking a polysiloxane material as a substrate, and performing physical vapor deposition to obtain a polysiloxane material-transition metal sulfide composite material; the polysiloxane material-transition metal sulfide composite material comprises a polysiloxane material and a transition metal sulfide two-dimensional material film loaded on the surface of the polysiloxane material; the polysiloxane material comprises one or more of methyl silicone oil, ethyl silicone oil and phenyl silicone oil; carbon tetrachloride is used to dissolve the polysiloxane material in the polysiloxane material-transition metal sulfide composite material to obtain the transition metal sulfide two-dimensional material. The application uses a liquid polysiloxane material as a substrate to load the transition metal sulfide, breaks through the shortcoming of small size of the two-dimensional material in the prior art, and can freely control the thickness of the two-dimensional material.

This invention discloses a method for preparing 4-(trifluoromethylsulfinyl)pyrazole compounds, comprising: dissolving terminal alkyne in n-hexane under nitrogen atmosphere, adding anhydrous zinc chloride, and reacting trifluoromethylsulfinyl chloride to obtain α-trifluoromethylalkynyl sulfoxide; adding benzoyl chloride dropwise to a CH2Cl2 solution of phenylhydrazine and triethylamine under nitrogen atmosphere to obtain acylhydrazine; adding carbon tetrachloride to a suspension of acylhydrazine and triphenylphosphine in acetonitrile to obtain hydrazone chloride; and reacting α-trifluoromethylalkynyl sulfoxide, hydrazone chloride, potassium carbonate, and anhydrous ethanol at room temperature to obtain 4-(trifluoromethylsulfinyl)pyrazole compounds. This invention uses inexpensive and readily available raw materials, the entire reaction route is mild and simple to operate, does not require stringent reaction conditions, and most of the reaction process is carried out at room temperature. The product yield is high, and the prepared trifluoromethylalkynyl sulfoxide pyrazole structure has multiple derivatization sites, showing good application prospects.

The invention discloses a method for measuring the content of petroleum in a desulfurization solution. The method comprises the following steps: 1) collecting or preparing the desulfurization solution on site; 2) carrying out distillation treatment, dehydration, magnesium silicate adsorption and filtration on the desulfurization solution to obtain a petroleum standard oil sample; or field petroleum is used for dehydration, magnesium silicate adsorption and filtration treatment, and a standard oil sample is prepared; (3) preparing a standard sample series by using the standard samples, and making a standard working curve by using an infrared oil measuring instrument; 4) extracting petroleum in the desulfurized amine liquid by using environment-friendly carbon tetrachloride, and performing oscillation, demulsification, standing, separation, dehydration and magnesium silicate adsorption to obtain an extract; 5, the absorbance is measured and converted through an infrared oil measuring instrument, and the numerical value of the petroleum content in the desulfurization solution is workped.The method belongs to the technical field of component analysis, the implementation process is rapid, simple and convenient, used instruments and agents are stable and low in price, and the requirement for measuring the petroleum content in the desulfurization solution is met.

The invention discloses a polyamido pinene formaldehyde adsorbent and a preparation method thereof, the method comprises the following steps: S1, adding carbon tetrachloride into alpha-pinene, stirring at 0 DEG C, dropwise adding liquid bromine, reacting for a certain time, then washing to remove residual liquid bromine, and performing rotary evaporation to remove carbon tetrachloride to obtain 2, 6-dibromocamphane; s2, dropwise adding m-phenylenediamine into the 2, 6-dibromocamphane, reacting for a certain time at 30 DEG C, and then removing residual m-phenylenediamine by rotary evaporation to obtain polyaminophenene; and S3, loading the polyamido pinene on the base material to obtain the polyamido pinene formaldehyde adsorbent.

The application provides a kind of hole transport layer, a kind of perovskite solar cell and preparation method, the hole transport layer is polytriarylamine film, the polytriarylamine film is dissolved in carbon tetrachloride and toluene asymmetric binary solvent system by polytriarylamine, is prepared by coating, thermal annealing;In the asymmetric binary solvent system, the volume ratio of carbon tetrachloride and toluene is 100:1 to 1:100.By using carbon tetrachloride and toluene asymmetric binary solvent system to prepare polytriarylamine hole transport layer, effectively inhibit coffee ring effect, improve film flatness and density, reduce interface defects, significantly improve the photoelectric conversion efficiency and long-term thermal and humid stability of perovskite solar cell and assembly.

The invention discloses application of gaboxadol or a pharmaceutically acceptable salt thereof in preparation of a medicine for treating liver fibrosis diseases, and belongs to the technical field of biological medicines, and research shows that the compound can influence collagen fiber crosslinking through targeted inhibition of the function of prolyl-4-hydroxylase a1 (prolyl-4-hydroxylase alpha 1, P4ha1), so that the anti-fibrosis effect is achieved. The invention further discloses an application of the gaboxadol or the pharmaceutically acceptable salt thereof in preparation of the medicine for treating the liver fibrosis diseases, and the application of the gaboxadol or the pharmaceutically acceptable salt thereof in preparation of the medicine for treating the liver fibrosis diseases and the application of the gaboxadol or the pharmaceutically acceptable salt thereof in preparation of the medicine for treating the liver fibrosis diseases. In a carbon tetrachloride induced mouse hepatic fibrosis model, the content of hydroxyproline and collagen deposition in I-type collagen molecules of the liver can be remarkably reduced by injecting the gaboxadol hydrochloride into the intraperitoneal cavity, and the hardness of the liver is reduced. A surface plasma resonance experiment proves that the probe has specific binding capacity with P4ha1. Toxicity experiments show that the compound is good in safety under the effective dosage. Therefore, the invention provides a new drug candidate and a theoretical basis for the treatment of hepatic fibrosis.

The present application relates to the technical field of chemical synthesis, and particularly relates to a preparation method of 4,4'-difluorobenzophenone and a method for synthesizing polyether ether ketone by two steps of carbon tetrachloride. The preparation method of 4,4'-difluorobenzophenone comprises the following steps: under the condition that trifluoromethanesulfonic acid and N-methyl pyrrolidone exist, CCl4 and fluorobenzene are reacted, and the product is hydrolyzed to obtain 4,4'-difluorobenzophenone. The present application solves the problems of high cost, poor environmental protection and performance that cannot meet market requirements of PEEK by innovating raw material route, catalytic system and process parameters, realizes low-cost, green and high-performance synthesis of PEEK, the purity of the prepared DFBP monomer can reach >=99.99%, and the PEEK molecular weight distribution (PDI<=1.9) can be narrowed, and the method is suitable for industrialized production of PEEK materials used in high-end fields such as aerospace, medical devices and electronic and electrical appliances.

This invention discloses a method and system for measuring and calibrating the concentration of an oil mist nano-dispersion, belonging to the field of mechanical testing technology. The invention prepares a nanobubble solution using a porous membrane tube permeation method, employing a ceramic porous membrane tube in conjunction with a pressure tank to control the nanobubble particle size and concentration. A Malvern particle size analyzer is used to measure the solution concentration, which is then adjusted to the desired concentration through proportional dilution. The nanobubble solution is considered equivalent to an oil mist dispersion, and an optical measurement device is built based on the extinction method. A 900nm laser is used to irradiate the solution in a high-transmittance container, and the transmitted light attenuation intensity is measured using an optical power meter. The solvent used is carbon tetrachloride, chloroform, or dichloromethane, and the nanobubble gas is carbon dioxide, water vapor, or methane. The concentration is calculated based on Lambert-Beer's law. This method achieves stable control of oil mist concentration, avoids sampling errors, and improves the calibration accuracy and reliability of the oil mist detector.

This invention discloses a porous activated carbon prepared using balsa wood material, its preparation method, and its application. The porous activated carbon has a pore diameter of 0.4 nm to 400 nm, and the pore volume ratio of micropores (0.4 nm to 2 nm), mesopores (2 nm to 50 nm), and macropores (50 nm to 400 nm) is greater than 30%. The specific surface area of ​​the porous activated carbon is 500 to 700 m² / g. It has an adsorption rate of 130% to 145% for carbon tetrachloride, exhibiting excellent adsorption performance.

The application provides a preparation method of triphenyl chloromethane and belongs to the technical field of pharmaceutical intermediates. The preparation method comprises the following steps: obtaining a suspension by using pure benzene, a composite catalyst and an adsorbent, then adding carbon tetrachloride drop by drop to obtain a reaction liquid, stirring and treating the reaction liquid with 808 nm laser when the reaction liquid is heated to 60-80 DEG C, and then performing post-treatment to obtain the triphenyl chloromethane. The composite catalyst catalyzes the reaction of pure benzene and carbon tetrachloride to generate triphenyl chloromethane and release hydrogen chloride, and the adsorbent can adsorb hydrogen chloride in situ, thereby preventing acid corrosion and catalyst poisoning while maintaining the forward progress of the reaction. The composite catalyst and the adsorbent realize catalysis-adsorption synergistic promotion of the forward progress of the reaction, thereby reducing the catalyst consumption, shortening the reaction time, reducing the wastewater generation amount, improving the reaction yield and the purity of the triphenyl chloromethane.

The application discloses a green preparation method of 4,4'-difluorobenzophenone. The method uses 4,4'-difluorobenzene as raw material, potassium bromide as catalyst, acetic acid as solvent, and oxygen as oxidant, and 4,4'-difluorobenzophenone is generated in high selectivity through one-step oxidation under mild conditions. The application surprisingly finds that in the presence of potassium bromide, a new non-metallic catalytic oxidation system of potassium bromide / acetic acid / oxygen is used to realize high-efficiency and high-selectivity conversion of the C-H bond at the benzyl position. Compared with the traditional method, the application does not need to use a transition metal catalyst, does not need to use carbon tetrachloride and other materials damaging the ozone layer, and does not need to involve a dangerous intermediate such as a diazonium salt, the process route is short, the atomic economy is high, the product yield is high, the product purity is high, the catalyst is cheap and easy to obtain, and the application has excellent industrial application prospect and green chemistry characteristics.

The invention provides an anode carbon block soaked with carbon. An adhesive for the anode carbon block soaked with the carbon comprises the following raw material components in parts by weight: 50-55 parts of coal pitch, 25-30 parts of borax, 10-15 parts of kaolin, 30-35 parts of industrial phosphoric acid, 40-45 parts of carbon tetrachloride and 50-55 parts of water. The preparation method of the soaked carbon anode carbon block comprises the following steps: measuring the surface temperature of an anode cooked block by using an infrared temperature measuring gun, slowly putting the anode cooked block into a soaking pool, keeping for 30-60 seconds, keeping for 25-35 seconds in the air, and then putting the anode cooked block into a drying oven for drying, thereby obtaining the soaked carbon anode carbon block. The service life of the anode carbon block obtained through the preparation method of the soaked carbon anode carbon block is prolonged, the pole changing period of the anode carbon block is increased to 36 days or above from 34 days, the anode carbon consumption is reduced, and the electrolytic bath process is stabilized.

The invention provides a preparation method of a vanadium polyethylene catalyst, which comprises the following steps: mixing and reacting a mixed solution of iodine, chloralkane and ether with metal magnesium to obtain an organic magnesium solution; the method comprises the following steps: mixing an organic magnesium solution with fatty acid ester for reaction to obtain a mixture, and then mixing the mixture with a chlorination reagent for reaction to obtain a solid magnesium-containing product; preparing a hydrocarbon solution of a solid magnesium-containing product, and mixing the hydrocarbon solution with an aluminum alkyl compound for reaction to obtain a magnesium-containing carrier; finally, adding a hydrocarbon solvent into the magnesium-containing carrier to obtain a magnesium-containing carrier suspension; wherein the chlorination reagent comprises halogenated aromatic hydrocarbon and carbon tetrachloride; and mixing the magnesium-containing carrier suspension and the vanadium-containing solution for reaction to obtain the vanadium polyethylene catalyst. The preparation method can further reduce the content of phenyl-containing compounds in the synthesis process of the vanadium polyethylene catalyst, and further improve the environmental friendliness of a polymerization product; the vanadium polyethylene catalyst prepared by the method is relatively high in vanadium content and has relatively high polymerization activity.

This invention discloses a method for preparing 2,3,3,3-tetrafluoropropylene, comprising reacting carbon tetrachloride with ethylene in the presence of a catalyst containing reduced iron powder and a co-catalyst, separating and purifying the reactants to obtain HCC-250fb; subjecting HCC-250fb to dehydrochlorination to generate HCC-1240za; reacting HCC-250fb with chlorine in a liquid-phase or gas-phase chlorination reaction to obtain HCC-240db; reacting HCC-240db with hydrogen fluoride in a gas-phase fluorination reaction to generate HCFO-1233xf; and reacting HCFO-1233xf with hydrogen fluoride in a gas-phase fluorination reaction in the presence of a supported or unsupported chromium oxide catalyst to generate HFO-1234yf. The method of this invention uses readily available raw materials, has low cost, and allows unreacted raw materials to be recycled for further reactions, resulting in minimal waste emissions.

The invention discloses application of demethylfolin or pharmaceutically acceptable salt thereof in preparation of a medicine for treating liver fibrosis diseases, belongs to the technical field of biological medicines, and discloses application of demethylfolin or pharmaceutically acceptable salt thereof in preparation of a medicine for treating liver fibrosis diseases through a mouse liver fibrosis model induced by carbon tetrachloride. It is proved that demethylfolin hydrochloride can significantly improve the pathological state of hepatic fibrosis: the content of hydroxyproline in liver type I collagen molecules is reduced, the liver tissue hardness is reduced, and the area of a fibrosis region is reduced. Toxicity experiments show that the compound has no obvious toxic or side effect on the liver in an effective dose and is good in safety. Therefore, the invention provides a new drug choice and theoretical basis for the treatment of hepatic fibrosis.

This invention belongs to the field of fluorochemical technology, specifically relating to a method for preparing cis-1,1,1,4,4,4-hexafluoro-2-butene. The method includes the following steps: I. Reacting 3,3,3-trifluoropropylene with carbon tetrachloride under light irradiation, optionally in the presence of a first catalyst, to obtain 1,1,1,3-tetrachloro-4,4,4-trifluorobutane; II. Reacting the obtained 1,1,1,3-tetrachloro-4,4,4-trifluorobutane with hydrogen fluoride in the presence of a second catalyst to obtain cis-1,1,1,4,4,4-hexafluoro-2-butene. The first step of this method uses a light-driven addition reaction, and the photocatalytic approach significantly reduces production costs. It can also be combined with a dedicated catalyst to improve reaction efficiency. The second step, the fluorination reaction, is adapted to a specific catalyst, which can effectively improve the conversion rate of the reactants and the selectivity of the target product, ensuring the overall high efficiency of the preparation process.

The invention belongs to the technical field of conversion process monitoring, and provides an on-line monitoring method for conversion of hydrochloric acid from carbon tetrachloride, which comprises the following steps: acquiring historical data of a conversion process in a steady state and operation under various preset abnormal working conditions, and constructing time sequence data including trichloromethane concentration and process parameters and a corresponding state label historical data set; performing statistical feature extraction on the historical data set, and establishing a correlation model between the statistical features of the trichloromethane concentration and the process parameter state based on a machine learning algorithm; the method comprises the following steps: detecting the concentration of trichloromethane in a reactor outlet product in real time through an online analysis instrument, calculating the real-time statistical characteristic of the real-time trichloromethane concentration as the input of a correlation model, and comparing the output process parameter monitoring combination with the currently activated process parameters to generate a control instruction. By monitoring a key reaction intermediate (trichloromethane), the number of monitored process parameters is optimized, and the preposition of abnormal early warning can also be realized.

The invention relates to a preparation method of 2, 3, 3, 3-tetrafluoropropene, which comprises the following steps: carrying out free radical addition on carbon tetrachloride and ethylene to generate 1, 1, 1, 3-tetrachloropropane; the method comprises the following steps of: chlorinating 1, 1, 1, 1, 3-tetrachloropropane to generate 1, 1, 1, 2, 3-pentachloropropane; the method comprises the following steps: carrying out fluorine and chlorine exchange on 1, 1, 1, 1, 2, 3-pentachloropropane liquid phase to generate 1, 1, 1, 2-tetrafluoro-3-chloropropane; and carrying out dehydrochlorination on the 1, 1, 1, 2-tetrafluoro-3-chloropropane to generate the 2, 3, 3, 3-tetrafluoropropene. Carbon tetrachloride and ethylene are used as starting raw materials, and the raw materials are low in cost and easy to obtain; hydrogen and noble metal hydrogenation catalysts are not needed, so that the safety risk and high cost of hydrogenation reaction are avoided; the fluorine-chlorine exchange process effectively reduces polyfluorinated by-products, and the product is high in purity and yield; reaction conditions are mild, intermediate products are easy to separate, and the method is suitable for large-scale continuous production; the byproduct HCl can be absorbed to prepare hydrochloric acid, so that recycling is realized, and green chemical requirements are met.

The invention relates to the technical field of preparation of adhesives and granular activated carbon, in particular to a composite adhesive, straw-based granular activated carbon and a preparation method. According to the specific technical scheme, firstly, the straw gasification tar is subjected to reduced pressure distillation under specific conditions (light components are removed at the temperature of 100 DEG C, and phenol-rich components are collected at the temperature of 170-250 DEG C) for fractional separation; phenol-rich components are used for partially replacing phenol (the replacement rate is 10-50%), the phenol-rich components react with formaldehyde under the catalysis of potassium hydroxide to synthesize phenolic resin, and sesbania powder is added for thickening. And compounding the thickened phenolic resin with the separated heavy components to obtain the composite adhesive. The adhesive and straw biochar are mixed and molded in proportion, and the straw-based granular activated carbon is prepared through the processes of hardening, carbonization, coupling activation and the like. The carbon tetrachloride adsorption rate of the product is greater than or equal to 60%, the strength is greater than or equal to 90%, and high-value utilization of straw tar and charcoal is realized.

A kind of urban sludge-containing sewage comprehensive treatment method and treatment system, solve the problems of low-cost high-efficiency sludge dewatering and sewage treatment, the treatment method is: sludge-containing sewage is stirred, mixed, precipitated with carbon tetrachloride liquid in displacement reaction tank, and forms water layer and carbon tetrachloride liquid and sludge mixed layer, overflowed water, carbon tetrachloride and sludge vaporization separation to remove organic water and dry sludge, carbon tetrachloride recycling is used.The treatment system scheme is: the system includes: displacement dewatering and organic matter processing part consisting of displacement reaction tank, water treatment part consisting of water intermediate tank and adsorption tower and displacement agent condensing tower consisting of displacement agent recovery part and heating station part.The beneficial effects of the present application are: simple process, safe and reliable, the treatment efficiency is increased by more than 10 times, the cost is reduced by 85%, the moisture content of sludge displacement dewatering is less than 5%, sludge displacement dewatering and sewage organic matter inactivation treatment are completed at the same time.

This invention provides the application of amphetamine hydrochloride in the preparation of drugs for the prevention and treatment of fibrotic diseases. The amphetamine hydrochloride provided by this invention can inhibit the synthesis of fibronectin and type I collagen in hepatic stellate cells, and exhibits significant anti-hepatic fibrosis therapeutic effects in a mouse model of liver fibrosis induced by bile duct ligation and carbon tetrachloride. This discovery provides a potential drug molecule with a new mechanism of action for the prevention and treatment of liver fibrosis.

The invention discloses a device for accurately controlling feeding of trace gas-phase carbon tetrachloride. The device comprises a constant-flux pump, a micro-channel evaporator, a constant-temperature unit and a CCl4 storage tank, the CCl4 storage tank is connected with the constant-flux pump through a pipeline, the constant-flux pump is connected with the micro-channel evaporator through a pipeline, and the constant-temperature unit is connected with the micro-channel evaporator through a pipeline to form a loop. Comprising the following steps: S1, setting the temperature of a constant temperature unit to be 90-120 DEG C, and starting the constant temperature unit; s2, the first valve and the third valve are in a closed state, and the second valve is in an open state; s3, setting the temperature of the first heating belt, the second heating belt, the third heating belt and the fourth heating belt to be 90-120 DEG C, and turning on a power supply of the heating belts; s4, the liquid level height of the CCl4 storage tank is checked and recorded; s5, when the actual temperature of the constant-temperature unit and the heating belt reaches the set temperature value, the flow of the constant-flux pump is set to be 0-20 mL / h, and the constant-flux pump and a third valve are opened; and S6, the constant-flux pump, the first heating belt and the second heating belt are sequentially closed, and the second valve is closed.

In a process for the production of 1,1,1,2,3-pentachloropropane, optionally in the presence of carbon tetrachloride, by introducing 1,1,1,3-tetrachloropropane, chlorine and a Lewis acid catalyst, the improvement comprising: introducing the Lewis acid as a slurry in a chlorinated hydrocarbon.

The invention belongs to the technical field of activated carbon preparation, and particularly discloses a porous carbon material based on circuit board waste and a preparation method and application of the porous carbon material. S2, mixing and activating with a composite activating agent; s3, carrying out carbonization treatment; s4, doping modification: carrying out heat treatment with ammonium fluoride, and then adding into a methyl triethoxysilane ethanol solution for soaking treatment; and S5, carrying out acid pickling purification on the composite acid pickling solution to obtain the moisture-resistant porous carbon material. According to the porous carbon material based on the circuit board waste and the preparation method and application of the porous carbon material, the porous carbon material has high specific surface area and pore volume, the adsorption rate of carbon tetrachloride in a humid environment is increased, the problem that traditional activated carbon is poor in moisture resistance is solved, resource utilization of waste circuit board non-metal waste is achieved, and the cost is reduced. And meanwhile, the environment-friendly and performance dual advantages are achieved, and the method is more suitable for industrial-grade VOCs treatment scenes.

The invention provides a filtrate reducer and an oil-based drilling fluid as well as a preparation method and application of the filtrate reducer and the oil-based drilling fluid. The preparation method of the filtrate reducer comprises the following steps: mixing acrylonitrile, isobutene and acetone, heating and stirring for a first reaction, and dropwise adding fuming sulfuric acid in the heating and stirring process to obtain a first mixture; mixing N-alkyl acrylamide with the first mixture, and heating for second reaction to obtain a second mixture; dimethylaminoethyl methacrylate and the second mixture are mixed and heated for a third reaction, and a third mixture is obtained; ethyl benzene, carbon tetrachloride and the third mixture are mixed and heated for a fourth reaction, and a fourth mixture is obtained; and extracting and washing the fourth mixture with absolute ethyl alcohol to obtain a white floccule, namely the filtrate reducer. The oil-based drilling fluid comprises an oil phase, bentonite, the filtrate reducer provided by the invention, a flow pattern regulator, a weighting agent and sodium hydroxide. The oil-based drilling fluid provided by the invention has good high-temperature drop filtration performance and is suitable for drilling of deep wells and ultra-deep wells.

This invention discloses a method and system for determining volatile halogenated hydrocarbons in dissolved gases of seawater, belonging to the field of analytical chemistry. The method employs direct gas injection combined with a six-way valve switching injection system, enabling the direct and simultaneous determination of seven volatile halogenated hydrocarbons in seawater: chloroform, carbon tetrachloride, trichloroethylene, bromodichloromethane, tetrachloroethylene, dibromochloromethane, and tribromomethane. This eliminates the need for organic solvents and complex pretreatment, filling a technological gap in this field. Validation shows a detection limit of 0.1–1.1 nmol / mol, a retention time RSD ≤ 0.20%, a concentration RSD ≤ 4.93%, and a relative error between -2.01% and 1.56%. The method exhibits advantages such as high sensitivity, good stability, simple operation, and environmental friendliness, and can be directly applied to fields such as marine environmental monitoring and seabed oil and gas resource exploration.

This invention belongs to the field of sulfur-containing silane production technology, and particularly relates to a clean production process for sulfur-containing silanes, comprising the following steps: Step S1, synthesizing mercaptopropyltriethoxysilane; S2, reacting the obtained mercaptopropyltriethoxysilane liquid with iodine solution and iodine in carbon tetrachloride solution in a reaction tower, with the generated hydrogen iodide discharged from the top of the reaction tower; Step S3, after the reaction, the mixture of liquid product and unreacted mercaptopropyltriethoxysilane is pumped from the bottom of the reaction tower into a vacuum distillation tower for separation to obtain qualified Si-75 product, and the unreacted mercaptopropyltriethoxysilane is recovered and returned to the reaction tower. This achieves recycling to reduce raw material costs, minimizes the types of materials used in the process, avoids the difficulties of using and handling solid materials, and thus enables high-capacity, low-cost, clean production of the sulfur-containing silane sulfurizing agent Si-75.