Silicomethane low-temperature production and byproduct comprehensive recycling process

The invention belongs to the field of polysilicon technology, in particular to a silicomethane low-temperature production and byproduct comprehensive recycling process. Silicomethane belongs to a special gas in the past, is generally used for scientific research and has small demand. The requirement on the purity is brought forward at present along with rapid development of solar energy industry,and the demand is increased day by day. The traditional process for preparing the silicomethane with small scale has complex operation, high cost and low production efficiency, heat released form reaction can not be dispersed in time to cause lower process safety, silane and ammonia leak is generated in the process of material flow, and the environment is polluted. The invention prepares silicomethane gas through purification and carries out comprehensive recycling on byproducts generated in the production so as to realize true circulation clean production. The silicomethane low-temperature production ...

Method for producing rare earth magnesium alloy by adopting rare earth oxide

The invention relates to a method for directly producing rare earth magnesium alloy by adopting rare earth oxide. The method comprises the following steps of: adding 5-35wt% nanometer-level rare earth oxide powder in an original refining agent, adding the refining agent added with the rare earth oxide on the surface of magnesium alloy in the smelting process, sufficiently stirring, refining and standing for 10 minutes. At high temperature, the affinity of Mg and oxygen is higher than the affinity of Mg and the rare earth oxide, thereby the rare earth in the rare earth oxide in the molten magnesium liquid is reduced into simple substance rare-earth elements which are dispersed into the magnesium liquid, and meanwhile, MgO impurities generated in the reaction and the refining agent added inthe refining process together sink to the furnace bottom, and the magnesium alloy which contains the rare earth and has high performance and low cost is prepared. Compared with the texture and performance ...

Shell pass multi-cavity type fixed bed reactor

The invention relates to a fixed-bed reactor, a shell side of which is divided into a plurality of chambers. Currently, all the fixed-bed reactors with shells and tubes adopt a shell-side structure as a chamber, thus causing uneven heat transfer, insufficient heat exchange and worse utilization of residual heat. Between an upper cannular plate and a lower cannular plate inside the shell of the invention, two shell-side baffles are arranged along the shell axial direction and divide the shell into three chambers, and reaction tubes as well as three semicircular traverse baffles are arranged inside the chambers at the two sides, thus forming cross current and parallel flow as a flow form of heat-exchanging mediums between tubes. Under the condition of existing equipments, the capacity of manufacturing large-scale reactors is doubled by the invention; the reactors are applicable for catalysts with high load and have balanced reaction, even heat transfer and sufficient heat exchange, and the ...

Device and method for measuring maximum aperture of filter element by dry method

The invention relates to a device and a method for measuring the maximum aperture of a filter element by a dry method. In the conventional filtering industry, apertures are measured universally by a bubble point test method; in the method, the filter element is tested in the state of complete immersing, so a test finishing point is difficult to judge due to the influence of the static pressure of infiltration liquid; and the absolute pressure of air inflow instead of pressure difference on both sides of air inflow and air discharge is detected in the measuring process, so a test result has the large deviation, and the numerical value of the maximum aperture of filter element cannot be reflected really. In the method of the invention, the maximum aperture is measured by a vacuum infiltration method so as to shorten the infiltration time substantially; the accuracy of measuring data is ensured by using a differential pressure method; and the influence of hydrostatic pressure in the state ...

Fixed bed reactor for producing maleic anhydride by benzene process with annual production capacity of 20 000 tons

Dry cooling device and method for high-temperature gas

The invention relates to a dry cooling device and a dry cooling method for high-temperature gas. In the conventional gas cooling technology, a combination device consisting of a water spray cooler and a shell-and-tube cooler is applied generally, cooling water is directly contacted with the high-temperature gas for heat exchange and water vapor enters cooled gas, so that the gas composition of the high-temperature gas is increased, the volume flow of the high-temperature gas is increased, system load is improved and system investment is increased. Heat exchange between the high-temperature gas and cooling water in a heat exchange tube is realized in a shell pass of a tube bundle cooler, so that the aim of efficiently lowering temperature is fulfilled on the premise of not increasing the gas composition and flow rate; a flow-diversion cone is designed, so that the resistance fall of a cooling device is reduced effectively; and a central barrel in the tube bundle cooler prevents the high-temperature ...

Silicomethane low-temperature production and byproduct comprehensive recycling process

The invention belongs to the field of polysilicon technology, in particular to a silicomethane low-temperature production and byproduct comprehensive recycling process. Silicomethane belongs to a special gas in the past, is generally used for scientific research and has small demand. The requirement on the purity is brought forward at present along with rapid development of solar energy industry,and the demand is increased day by day. The traditional process for preparing the silicomethane with small scale has complex operation, high cost and low production efficiency, heat released form reaction can not be dispersed in time to cause lower process safety, silane and ammonia leak is generated in the process of material flow, and the environment is polluted. The invention prepares silicomethane gas through purification and carries out comprehensive recycling on byproducts generated in the production so as to realize true circulation clean production. The silicomethane low-temperature production ...

Device and method for measuring maximum aperture of filter element by dry method

The invention relates to a device and a method for measuring the maximum aperture of a filter element by a dry method. In the conventional filtering industry, apertures are measured universally by a bubble point test method; in the method, the filter element is tested in the state of complete immersing, so a test finishing point is difficult to judge due to the influence of the static pressure ofinfiltration liquid; and the absolute pressure of air inflow instead of pressure difference on both sides of air inflow and air discharge is detected in the measuring process, so a test result has the large deviation, and the numerical value of the maximum aperture of filter element cannot be reflected really. In the method of the invention, the maximum aperture is measured by a vacuum infiltration method so as to shorten the infiltration time substantially; the accuracy of measuring data is ensured by using a differential pressure method; and the influence of hydrostatic pressure in the state of ...

Tough easy-deforming magnesium alloy

The invention relates to a novel magnesium alloy material, in particular to a magnesium alloy which has strong toughness and is easy to deform, through compounding and adding cerium, yttrium, gadolinium and strontium, the magnesium alloy which has excellent plastic deformation capacity and high mechanical properties is obtained. The percentage by weight of the components are that aluminum is 2.8-3.2, zinc is 0.8-1.1, magnesium is 0.4-0.7, cerium is 0.4-0.8, yttrium is 0.6-1.2, gadolinium is 3-6, and strontium is 0.08-1.2. The percentage by weight of limited impurity elements are that silicon is less than 0.03, ferric is less than 0.004, cuprum is less than 0.003, nickel is less than 0.002, calcium is less than 0.002, and the other content is magnesium. The single pass maximum lower compression ratio of the invention is greater than 35 percent under the homogenization conditions for 4 hours, and the single pass maximum lower compression ratio is greater than 50 percent under the homogenization ...

Sequential simulated moving bed

The invention relates to a sequential simulated moving bed. The simulated moving bed is mass transfer equipment which carries out liquid separation by utilizing an adsorption principle and is widely applicable to various production fields of petroleum, fine chemicals, biology, medicine, food and the like, and the existing simulated moving bed can not adopt a manual mode to open a valve and is usually of a monomer structure, namely a single moving bed of 4 columns or 6 columns, which can not switch among various working conditions. The sequential simulated moving bed utilizes circulating pumps arranged between two adjacent chromatographic columns to push materials to pass through the chromatographic columns, thus avoiding accumulation; the circulation of a raw material tank can avoid a circulation blocking phenomenon of a pipeline; from a chromatographic column III, feed ports of the chromatographic columns of odd numbers are provided with manual valves, and flexible switching among various ...

Vertical type full automatic plate-and-frame filter press, and filter technique

The invention relates to a vertical full automation filter press. The existing filtration filter pressing installment as a result of the structure technology, ,the horizontal hand movement filtration frame which uses the plastic has low production efficiency and big environmental pollution; because the semiautomatic pressure filtration installment also uses the electrical controlled method, but the automated coordination performance of other organization is bad, its stability and the production efficiency are low, specially when the seal cavity bearing, the equipment presents vibration and spray phenomenon. The filter press includes the leveling board frame group, the main body support structure, the board frame group opening and holding apparatus, the filtering cloth automatic cycle running gear, the filtering cloth washing device, automatic control system, hydraulic system, craft circuitry and so on. It uses the vertical structure to realize the full automatic operation, thus has high ...

Tough easy-deforming magnesium alloy

The invention relates to a novel magnesium alloy material, in particular to a magnesium alloy which has strong toughness and is easy to deform, through compounding and adding cerium, yttrium, gadolinium and strontium, the magnesium alloy which has excellent plastic deformation capacity and high mechanical properties is obtained. The percentage by weight of the components are that aluminum is 2.8-3.2, zinc is 0.8-1.1, magnesium is 0.4-0.7, cerium is 0.4-0.8, yttrium is 0.6-1.2, gadolinium is 3-6, and strontium is 0.08-1.2. The percentage by weight of limited impurity elements are that silicon is less than 0.03, ferric is less than 0.004, cuprum is less than 0.003, nickel is less than 0.002, calcium is less than 0.002, and the other content is magnesium. The single pass maximum lower compression ratio of the invention is greater than 35 percent under the homogenization conditions for 4 hours, and the single pass maximum lower compression ratio is greater than 50 percent under the homogenization ...

Vertical type full automatic plate-and-frame filter press, and filter technique

The invention relates to a vertical full automation filter press. The existing filtration filter pressing installment as a result of the structure technology, ,the horizontal hand movement filtrationframe which uses the plastic has low production efficiency and big environmental pollution; because the semiautomatic pressure filtration installment also uses the electrical controlled method, but the automated coordination performance of other organization is bad, its stability and the production efficiency are low, specially when the seal cavity bearing, the equipment presents vibration and spray phenomenon. The filter press includes the leveling board frame group, the main body support structure, the board frame group opening and holding apparatus, the filtering cloth automatic cycle running gear, the filtering cloth washing device, automatic control system, hydraulic system, craft circuitry and so on. It uses the vertical structure to realize the full automatic operation, thus has high ...

Shell pass multi-cavity type fixed bed reactor

The invention relates to a fixed-bed reactor, a shell side of which is divided into a plurality of chambers. Currently, all the fixed-bed reactors with shells and tubes adopt a shell-side structure as a chamber, thus causing uneven heat transfer, insufficient heat exchange and worse utilization of residual heat. Between an upper cannular plate and a lower cannular plate inside the shell of the invention, two shell-side baffles are arranged along the shell axial direction and divide the shell into three chambers, and reaction tubes as well as three semicircular traverse baffles are arranged inside the chambers at the two sides, thus forming cross current and parallel flow as a flow form of heat-exchanging mediums between tubes. Under the condition of existing equipments, the capacity of manufacturing large-scale reactors is doubled by the invention; the reactors are applicable for catalysts with high load and have balanced reaction, even heat transfer and sufficient heat exchange, and the ...

Temperature reduction method for hot gas and device thereof

The invention relates to the technique for cooling hot gas, particularly to a temperature reduction method for hot gas and a device thereof. At present, the method for reducing temperature by sprayingis used widely, which not only increase the composition of hot gas and the volume flow, but also increase the investment of system, with low heat exchange efficiency and difficulty to control the process. The invention comprises a tube bundle heat exchanger canister, an outer jacket of a tube bundle cooler, a light tube heat exchange unit, and a finned tube heat exchange unit. The light tube heatexchange unit and the finned tube heat exchange unit are orderly disposed inside of the tube bundle heat exchanger canister. The outer jacket of a tube bundle cooler is fixedly disposed on the outerwall of the tube bundle heat exchanger canister. The hot gas is cooled by air exchanging heat with recycled cooling water by entering the tube bundle heat exchanger. By adopting the tube bundle heat exchanger ...

Temperature reduction method for hot gas and device thereof

The invention relates to the technique for cooling hot gas, particularly to a temperature reduction method for hot gas and a device thereof. At present, the method for reducing temperature by spraying is used widely, which not only increase the composition of hot gas and the volume flow, but also increase the investment of system, with low heat exchange efficiency and difficulty to control the process. The invention comprises a tube bundle heat exchanger canister, an outer jacket of a tube bundle cooler, a light tube heat exchange unit, and a finned tube heat exchange unit. The light tube heat exchange unit and the finned tube heat exchange unit are orderly disposed inside of the tube bundle heat exchanger canister. The outer jacket of a tube bundle cooler is fixedly disposed on the outerwall of the tube bundle heat exchanger canister. The hot gas is cooled by air exchanging heat with recycled cooling water by entering the tube bundle heat exchanger. By adopting the tube bundle heat exchanger ...

Shell pass multi-cavity type multi-layer bed fixed bed reactor

The invention relates to a multi-layered fixed-bed reactor, a shell side of which has a plurality of chambers. Currently, all the fixed-bed reactors with shells and tubes adopt a shell-side structure as a chamber, thus causing uneven heat transfer, insufficient heat exchange and worse utilization of residual heat. The shell of the invention is composed of an upper shell and a lower shell, and between an upper cannular plate and a lower cannular plate inside each shell, two shell-side baffles are arranged along the shell axial direction and divide the shell into three chambers, and reaction tubes as well as three semicircular traverse baffles are arranged inside the chambers at the two sides, thus forming cross current and parallel flow as a flow form of heat-exchanging mediums between tubes. Under the condition of existing equipments, the capacity of manufacturing large-scale reactors is doubled by the invention; the reactors are applicable for catalysts with high load and have balanced ...

Crystal diabetin manufacturing technique on vertical type continuous crystallizer

The present invention relates to process of producing crystalline fructose in a vertical continuous crystallizer, and is based on the continuous crystallizer in the invention of disclosing number of CN 2774609. The fructose cooling crystallization process requires cooling crystallization capacity over 5 sq m/cu m, reasonable connection of the cooling assemblies and strictly controlled temperature. The production process of crystalline fructose has stable temperature gradient of material system, ideal temperature lowering effect, sustained crystal seed supply and sustained and stable production.

Method for producing rare earth magnesium alloy by adopting rare earth oxide

The invention relates to a method for directly producing rare earth magnesium alloy by adopting rare earth oxide. The method comprises the following steps of: adding 5-35wt% nanometer-level rare earth oxide powder in an original refining agent, adding the refining agent added with the rare earth oxide on the surface of magnesium alloy in the smelting process, sufficiently stirring, refining and standing for 10 minutes. At high temperature, the affinity of Mg and oxygen is higher than the affinity of Mg and the rare earth oxide, thereby the rare earth in the rare earth oxide in the molten magnesium liquid is reduced into simple substance rare-earth elements which are dispersed into the magnesium liquid, and meanwhile, MgO impurities generated in the reaction and the refining agent added in the refining process together sink to the furnace bottom, and the magnesium alloy which contains the rare earth and has high performance and low cost is prepared. Compared with the texture and performance ...

Crystal diabetin manufacturing technique on vertical type continuous crystallizer

The present invention relates to process of producing crystalline fructose in a vertical continuous crystallizer, and is based on the continuous crystallizer in the invention of disclosing number of CN 2774609. The fructose cooling crystallization process requires cooling crystallization capacity over 5 sq m/cu m, reasonable connection of the cooling assemblies and strictly controlled temperature. The production process of crystalline fructose has stable temperature gradient of material system, ideal temperature lowering effect, sustained crystal seed supply and sustained and stable production.

Method for producing low carbon chemical ethanol from C6 sugar alcohol

The invention relates to a method for producing low carbon chemical ethanol from C6 sugar alcohol. Chinese patent disclosed number CN1683293A discloses a method for producing dihydric alcohol and andpolyhydric alcohol by cracking sorbierite. The method comprises the steps of converting the sorbierite into glycol, propanediol and glycerin, but process data and a process route as well as products do not achieve good industrial production requirements. The method mainly adopts a continuous process to hydrocrack the C6 sugar alcohol to generate a low carbon ethanol mixture and finally obtains a single (or mixed) product by separating and refining in alkaline environment, in the presence of a nickel chrome catalyst and at high temperature and high pressure. The process route has the advantages of simple process, easy operation, high yield in unit time and variety of the products; and as the catalyst has different selectivities, the composition rate of the produced products can be substantially ...