2828 results about "Chemical production" patented technology

A process for satisfying variable power demand and a method for maximizing the monetary value of a synthesis gas stream are disclosed. One or more synthesis gas streams are produced by gasification of carbonaceous materials and passed to a power producing zone to produce electrical power during a period of peak power demand or to a chemical producing zone to produce chemicals such as, for example, methanol, during a period of off-peak power demand. The power-producing zone and the chemical-production zone which are operated cyclically and substantially out of phase in which one or more of the combustion turbines are shut down during a period of off-peak power demand and the syngas fuel diverted to the chemical producing zone. This out of phase cyclical operational mode allows for the power producing zone to maximize electricity output with the high thermodynamic efficiency and for the chemical producing zone to maximize chemical production with the high stoichiometric efficiency. The economic potential of the combined power and chemical producing zones is enhanced.

A process for satisfying variable power demand and a method for maximizing the monetary value of a synthesis gas stream are disclosed. One or more synthesis gas streams are produced by gasification of carbonaceous materials and passed to a power producing zone to produce electrical power during a period of peak power demand or to a chemical producing zone to produce chemicals such as, for example, methanol, during a period of off-peak power demand. The power-producing zone and the chemical-production zone which are operated cyclically and substantially out of phase in which one or more of the combustion turbines are shut down during a period of off-peak power demand and the syngas fuel diverted to the chemical producing zone. This out of phase cyclical operational mode allows for the power producing zone to maximize electricity output with the high thermodynamic efficiency and for the chemical producing zone to maximize chemical production with the high stoichiometric efficiency. The economic potential of the combined power and chemical producing zones is enhanced.

A process is defined for the continuous steam pretreatment and fractionation of corn cobs and low lignin lignocellulosic biomass to produce a concentrated cellulose solid stream that is sensitive to enzymatic hydrolysis. Valuable chemicals are recovered by fractionating the liquid and vapor stream composed of hydrolysis and degradation products of the hemicellulose. Cellulosic derived glucose is produced for fermentation to biofuels. A hemicellulose concentrate is recovered that can be converted to value added products including ethanol.

The invention provides improved electrodes for electrolytic cells operating with molten salt electrolytes. Nonconsumable iridium-based anodes of the invention facilitate the release of gaseous oxygen from oxide-containing melts, for example in the electro-chemical production of liquid or gaseous reactive metals from oxides. Cathode substrates of the invention are constructed of a tungsten-based alloy and enable deposition of an overlying liquid-metal cathode. Incorporation of the anode and cathode substrate of the invention into molten-oxide cells establishes a novel method for electrolytic extraction of titanium and other reactive metals.

The invention discloses a chemical production method, in particular a novel green production process for propylene oxide. In the method, the process design is carried out by using bipolar membrane, electrodialysis, antiosmosis, air flotation, heat exchange, oxidation, and other technology. In the production process, sodium hydroxide replaces the conventional calcium hydroxide and generates sodium chloride through reaction; the sodium chloride generates hydrochloric acid and sodium hydroxide by the bipolar membrane technology; and the hydrochloric acid is recovered, and the sodium hydroxide and water can be recycled. Therefore, no new sodium hydroxide is needed and no wastewater is discharged in the production of the propylene oxide. The sodium hydroxide is added at the preliminary stage of the production of the propylene oxide, and the input amount of the sodium hydroxide is controlled between 5 and 15 percent. The novel green production process for the propylene oxide has the advantages that: the recycling of the water, sodium chloride and sodium hydroxide is realized, the effects of zero discharge and input reduction of production materials are substantially achieved, and finally better social and economic benefits are achieved. The novel green production process for the propylene oxide can be widely applied to the chlorohydrin production in China.

A modular chemical production system that preferably includes a microreactor for producing a product by reacting two or more reactants. Modularization enables components such as controllers, pumps, valves, microreactors, and processing modules to be added or removed from the system as required to produce a desired product. A minimum system includes a control module and a reaction module, which has a mixing volume and a reaction volume. Various pumping modules and residence time modules may also be included in the system. Modules can be changed if malfunctioning, or for producing a different product, or to change a quantity of the chemical produced. The control module preferably accesses a database in which data define parameters for a plurality of different reactions that are optimized for the production of different chemical products. The user selects the product desired and the amount of the product, provides the reactants, solvents, and heat transfer media supplies, and the control module operates the system to automatically produce the product until the desired amount is obtained. The reaction module preferably includes a microreactor, which can be replaced with a microreactor of a different configuration to produce a different product. Connections between modules are designed to enable quick connection and disconnection of modules, and fluid lines are self sealing to prevent leakage of fluids when changing modules.

The invention relates to a rechargeable metal-air redox flow battery compatible with electrochemical preparation. When the battery is charged, electric energy input makes metal ions in the electrolyte flowing through a negative electrode reduced and deposited into metal to prepare for discharge, and the electric energy also makes reductive raw materials in the electrolyte flowing through a positive electrode oxidized into a product required to be synthesized. When the battery is discharged, the positive electrode is introduced with air or oxygen, the air or the oxygen is reduced on the electrode, and the positive electrode and a deposition redox flow metal negative electrode form the metal-air redox flow battery to output electric energy. In each charge and discharge cycle, the accumulation and discharge of the metal-air redox flow battery are carried out, and simultaneously electrooxidation chemical production is carried out so as to achieve the effect that one portion of electric energy is consumed and two functions are realized. The redox flow battery combines two functions of rechargeable metal-air accumulation and electrochemical preparation, realizes the combination of electrosynthesis, a deposition redox flow battery and a rechargeable metal-air battery, achieves the effects of energy conservation and high efficiency, improves the utilization rate of the electric energy and has good application prospect.

A method and an apparatus for plasma-chemical production of nitrogen monoxide is used to produce inhalation gas enriched with nitrogen monoxide for medical purposes. The nitrogen-monoxide production is achieved through the use of a dielectric barrier discharge created in a process gas containing nitrogen and oxygen.

The invention discloses an organic solvent absorbing agent and a preparation method thereof. The organic solvent absorbing agent is prepared by carrying out suspension polymerization reaction on acrylics, methacrylates, styrene, a cross-linking agent and an initiating agent in the environment that water and a dispersing agent exist. The organic solvent absorbing agent disclosed by the invention has the advantages of wide absorbing range, high absorption rate, high absorption speed and the like; an absorbed surface has small viscosity and a certain jelly strength, the organic solvent absorbing agent is convenient to recover and recycle and good in industrial applicability. The organic solvent absorbing agent disclosed by the invention can be reused more than ten times, the problem of poor reusability of a conventional absorbing material is solved, the secondary pollution caused by emission of a used absorbing agent as a waste is effectively reduced, and meanwhile the effects that the resource utilization rate is improved and the cost is reduced are achieved. The organic solvent absorbing agent can be used for treatment of industrial solvent-containing wastewater, and leakage and emergent absorption of an organic solvent in chemical production and is high in practicability and has a broad development prospect.

The invention relates to a preparation method for 5-hydroxymethyl furfural, which belongs to production technology of chemicals, in particular to a method for synthesizing 5-hydroxymethyl furfural (HMF) from carbohydrates by adopting a catalytic way. The method for preparing the 5-hydroxymethyl furfural uses heteropolyacid or heteropolyacid salt as a catalyst, and the 5-hydroxymethyl furfural with high purity can be obtained at a high yield by modulating the catalyst activity, choosing proper solvents, adding additives, optimizing the reaction temperature and time and improving the post treatment technologies, and the corrosion to devices and the environmental pollution can be avoided when using liquid super acids. In the system of saturated sodium chloride solution-positive butanol, the yield of the HMF can reach 70 percent under the catalysis reaction of phosphotungstic acid for 4 minutes at 175 DEG C.

The invention relates to a method for recovering phosphorus in phosphorus chemical wastewater by using a struvite production technology. The method is carried out according to the following steps of: firstly carrying out preliminary sedimentation on the phosphorus chemical wastewater, removing impurity precipitation in the wastewater, and collecting the processed wastewater in a first collecting tank; removing inorganic fluoride ion in wastewater in the first collecting tank by adopting a first-level quick lime method, and collecting the processed wastewater into a second collecting tank; removing inorganic cations in the wastewater in the second collecting tank via a cation exchange device, and collecting the processed ion exchange wastewater into a third collecting tank; finally adjusting pH value of the ion exchange wastewater to 7-9 in a struvite reactor by alkali liquor and adding magnesium source and nitrogen source, wherein the molar ratio of magnesium/phosphorus is 1.0-1.5; and the molar ratio of nitrogen/phosphorus is 1.0-1.5; and generating a magnesium ammonium phosphate granulated fertilizer in a crystalline state in the reactor. The water from the struvite reactor achieves the secondary standard of the national wastewater discharge standard and can be directly reused in a phosphorus chemical production system or discharged up to the standard.

The invention relates to a salt, alkali and calcium combined cycle production technology by the use of well mineral salt. Based on the exploitation of brine from well mineral salt, the salt, alkali and calcium combined cycle production technology by the use of well mineral salt is a cycle production technology, which focuses on the technology for making alkali from brine by the ammonia-soda process and takes account of the vacuum salt-making (including the brine refinement) and calcium-making technologies. Alkali-making wastewater replaces most fresh water to be injected into a salt mine well to collect brine, and the obtained high-calcium brine is taken as the raw material of the salt and calcium (including liquid calcium) co-production as well as the raw material for preparing alkali and other chemical production raw materials, wherein the liquid calcium can be used to produce liquid salt; alkali-making waste residues are injected into an underground dissolution cavern, namely a salt cavern which is formed by the exploitation of brine from well mineral salt, thus accomplishing the combined cycle production technology in which alkali-making and salt-making technologies are closely related with materials. The produced wastes are used as resources or undergo a harmless treatment, thus protecting the environment. In addition, the utilization rate of sodium chloride in rock salt reaches 100%, achieving maximum efficiency.

The invention discloses a poly-generation system of underground coal gasification (UCG) and a method thereof. .The system comprises a UCG subsystem, a thermal value and component regulation subsystem and a chemical production system; the UCG subsystem is used for injecting gasification agent into a gasification tunnel after gasification fire so that the gasification agent conducts gasification reaction with a coal bed in the gasification tunnel to generate synthesis gas; crude synthesis gas is led into the thermal value and component regulation subsystem; the thermal value and component regulation subsystem is used for reintegrating the component and thermal value of the synthesis gas and sending the reintegrated synthesis gas into the chemical production system as feed gas; the chemical production system is used for producing chemical products by utilizing the synthesis gas sent by the thermal value and component regulation subsystem. By adopting the method and system provided by the invention, coal gasification poly-generation process can be completed under the condition of energy saving and environmental protection.

The invention discloses persimmon powder and a production technique thereof. The technique comprises the following steps that: after extraction of juice from persimmon, the juice undergoes zymohydrolysis, filtration, enzyme killing and concentration; after vacuum freeze drying of a concentrated solution, powdery materials with a tannin weight content between 1 and 99 percent are prepared; and the dissolution rate of the powdery materials in water is more than or equal to 50 percent. Compared with the prior art, the technique applies the technologies of zymohydrolysis and vacuum freeze drying in processing and production of persimmons, and selects the superior zymohydrolysis technology to perform cellular level processing on the persimmons on the premise that the compositions of the persimmons are researched; auxiliary materials used by the processing are ecological and environment-friendly and has no chemical pollution, and finished products are superior natural nontoxic chemical raw materials; and the materials are dried by adoption of the vacuum freeze drying technology, thereby the biological active ingredients of the materials are reserved to the maximum degree and the materials are easier to dissolve in water, consequently the materials are convenient to perform various chemical reactions so as to be widely applied in the chemical production. Moreover, the technique greatly releases the pressure of farmers for selling fresh fruit, and raw materials can be purchased from the farmers during the fruit thinning period; and the products obtained can be used for manufacturing cosmetics, recovering heavy metals in sewage, preventing the materials from being corroded, etc, and have a wide market prospect.

The invention provides an energy-saving evaporation process and an energy-saving evaporation system, belonging to secondary steam waste heat recovery in the field of high-efficiency recycling. The energy-saving evaporation process and the energy-saving evaporation system can be widely applied to sewage and wastewater treatment, desalination of sea water, solution concentration in chemical production and other industrial departments. The main process comprises the following steps: enabling raw material solution to absorb heat in an evaporator and to boil and vaporize to generate secondary steam, pressurizing and heating the secondary steam through a high-temperature high-pressure water jet circulating system, taking the secondary steam as heating steam to be returned to the evaporator, releasing the heat in the evaporator, and heating the raw material solution so as to boil and vaporize the raw material solution to generate the secondary steam; and heating the steam and condensing the steam into condensate so as to recycle the heat, discharging the condensate into a heat exchanger from the evaporator to perform heat exchange with the raw material solution, so that temperature of the raw material solution is raised, heat of the condensate is released, and the condensate is discharged. By adopting the process, waste heat in the secondary steam can be effectively utilized, the operating cost is reduced, and lots of energy is saved.

A thin die Package Substrate is described that may be produced using existing chemistry. In one example, a package substrate is built over a support material. A dry film photoresist layer is formed over the package substrate. The support material is removed from the package substrate. The dry film photoresist layer is removed from the substrate and the substrate is finished for use with a package.

The invention discloses a chemical production on-line fault detection and diagnosis technique based on a physical-large data hybrid model. The chemical production on-line fault detection and diagnosis technique is characterized by comprising the following steps: after selecting a target operation unit, scanning all historical data of the unit, and after parameters are verified, establishing an accident knowledge base and a parameter model; in later on-line detection process, directly loading on-line data into the parameter model, scanning so as to obtain fault data in the on-line data, making an alarm, and comparing the fault data with data in the accident knowledge base, thereby obtaining fault reasons. The method disclosed by the invention is applied to confirmed single chemical unit operation, a reliable physical model can be established, a chemometrical method is used in the whole production process, a big-data processing technique is introduced to process real-time data of years, operators focus on faults of performance indexes within a controllable variable range, and the influence of uncontrollable production process variable to fault detection is eliminated.

The invention discloses a wet method used for preparing sulfuric acid from exhaust gas containing hydrogen sulfide, and belongs to the technical field of waste gas treatment in environmental protection industry and chemical production. The wet method comprises following steps: removal of nitrogen compounds of the exhaust gas containing hydrogen sulfide is realized using dilute sulphuric acid with a mass fraction of 30 to 50%; the treated exhaust gas containing hydrogen sulfide is delivered into an incinerator, preheated air is added so as to maintain a combustion temperature of 700 to 1000 DEG C and a reducing/oxidizing atmosphere, so that sufficient burning of hydrogen sulfide and other combustible components is realized, and generation amount of nitrogen oxide is reduced; high temperature gas at an incinerator outlet is delivered into a medium pressure waste heat boiler so as to recycle heat energy and byproduct saturated vapour; flue gas containing sulfur dioxide at a waste heat boiler outlet is delivered directly into a converter, and flue gas containing sulfur trioxide and vapour is obtained via primary conversion; reaction heat in the converter is removed in time using heat-exchange equipment; flue gas at a converter outlet is delivered into at least primary-stage condenser tube pass, and an appropriate amount of air is delivered into condenser shell pass to be used as a cooling medium; heat energy of high temperature concentrated sulfuric acid flows out from the bottom of the condenser is recycled via a desalting water preheater and an acid cooler; and exhaust gas at a condenser outlet is delivered into a desulfurization tower so as to remove sulfur dioxide and nitrogen oxides.

The invention belongs to the technical field of the chemical production, and relates to a technology for optimizing energy saving and integrating treatment of waste water, waste slag and waste gas in a furfural production process, which is suitable for the energy saving and the three-waste treatment and reformation of furfural production enterprises. The technology is characterized in that limestone and dolomite are used for neutralizing furfural waste water to convert acetic acid into calcium magnesium acetate, and then the water exchanges heat with high-temperature aldehyde gas generated by a hydrolysis kettle to enter an evaporator; high-temperature vapor generated by the vaporization of the waste water enters the hydrolysis kettle to be used as a reaction medium, the residual concentrated liquid is decolorized for extracting calcium magnesium acetate salt, and the residual liquid is used for smoke desulfurization and denitration. After the low-pressure automatic heating and vaporization of high-temperature aldehyde slag for furfural recovery, the high-temperature aldehyde slag is dried at a low temperature to reduce the water content of the aldehyde slag to be lower than 20 percent. The invention has the advantages that the utilization rates of materials and energy are greatly increased, the zero discharge of three wastes is realized without additional energy consumption, and the calcium magnesium acetate salt of high value is also prepared. After the automatic heating distillation and low-temperature drying of the aldehyde slag, the aldehyde slag is used for active carbon and is effectively and cleanly burnt.

The invention discloses a material mixing device for chemical production. The material mixing device comprises a device body; the device body comprises a main body, the inner side of the main body is provided with a heat preservation layer, the inner side of the heat preservation layer is provided with a resistance wire heating layer, and the inner side of the resistance wire heating layer is provided with a ceramic layer; a feeding opening is formed in the left end of the upper side of the device body; a clapboard is horizontally arranged on the upper side of the interior of the device body and fixed on the inner wall of the device body; a bearing base is connected to the center of the top of the device body. The material mixing device for the chemical production is reasonable in structural design and long in service life; a stirring rotating shaft rotates clockwise and counterclockwise alternately, so that the material mixing effect and the working efficiency are effectively improved; the length of a stirring rod can be increased or decreased according to the rotation speed, and therefore the mixing radius is changed; through the arrangement of a stirring disc, materials at the bottom can be mixed, and the material mixing effect is further improved; in addition, under the cooperation function of a damping and energy-absorption part, a connecting rod, an annular spring part and an auxiliary damping part, the vibration caused when the device runs can be greatly reduced, and the stability is improved.