40results about How to "Reduce the number of plates" patented technology

The invention discloses a tubular furnace method pressure-reduced debenzolization and distillation process. The process comprises the following steps of: carrying out heat exchange on rich oil from a benzene washing section by using an oil-gas heat exchanger and a lean oil-rich oil heat exchanger, entering the convection section of a tubular heating furnace for heating to 175-185 DEG C, then entering a debenzolization tower for debenzolization and distillation, collecting a crude benzene product from the tower top and returning lean oil at the tower bottom to a benzene washing tower, wherein the tower top pressure of the debenzolization tower is 13.3-70 kPa and the tower bottom pressure is 23.3-80 kPa; and the tower top temperature is 40-80 DEG C and the tower bottom temperature is 195-270 DEG C. Compared with traditional debenzolization processes, the pressure-reduced debenzolization and distillation process mainly has the advantages that: 1. the operation can be carried out under a negative pressure, and steam stripping can be omitted; 2. the yield of crude benzene is improved by 0.05-0.35%; 3. steam is not used; 4. since a regenerator is not used, the process structure is more compact and the occupation area is smaller; and 5. One oil-water separator is omitted, the regenerator is not used and a novel debenzolization tower is designed, thus effectively saving equipment investment cost.

The invention discloses an air separation fractionating tower system and a technology utilizing the air separation fractionating tower system to prepare low-purity oxygen. The pressure air is subject to heat exchange by a main heat exchanger and a liquid oxygen evaporator and is converted into partially liquefied air, then the air is separated into oxygen-rich liquid air and nitrogen in a lower tower of the fractionating tower, and the oxygen-rich liquid air enters an upper tower of the fractionating tower; the nitrogen is cooled into liquid nitrogen in the condensing evaporator, and is sent into the upper tower of the fractionating tower through an overcooler; each material in the upper tower of the fractionating tower is separated into low-purity liquid oxygen and nitrogen, and the low-purity liquid oxygen is subject to heat exchange and gasifying with the nitrogen at the lower part of the lower tower of the fractionating tower in the condensing evaporator, is subject to heat exchange by the condensing evaporator and the main heat exchanger, and is sent out as a product; the low-purity liquid oxygen is also subject to heat exchange by the liquid oxygen evaporator and the main heat exchanger, and is sent out as the product. The air separation fractionating tower system has the advantages that the low-purity oxygen and high-purity oxygen with different purities and pressures can be simultaneously produced, the operation pressure is low, the extraction rate is high, the energy consumption is little, the equipment investment is low, the requirements of low-purity oxygen and high-purity oxygen in multiple industries can be well met, and the air separation fractionating tower system is suitable for industrial production.

The invention discloses a high-efficiency extraction process in a hydrogen peroxide production process. According to the invention, in an extraction process of an anthraquinone method for producing hydrogen peroxide; an extraction tower I and an extraction tower II are arranged; an oxidation liquid is divided into two parts which are an oxidation liquid I and an oxidation liquid II; pure water is introduced from the top of the extraction tower I, and the oxidation liquid I is introduced from the bottom of the extraction tower I; the two phases are subjected to countercurrent extraction in the extraction tower I; raffinate is discharged from the top of the extraction tower I, and is subjected to separation in a liquid/liquid separator, such that a heavy phase and a light phase are obtained; the heavy phase is mixed with extract liquid from the bottom of the extraction tower I, and the mixture of the heavy phase and the extract liquid from the bottom of the extraction tower I is introduced from the top of the extraction tower II; the light phase is mixed with the oxidation liquid II, and the mixture of the light phase and the oxidation liquid II is introduced from the bottom of the extraction tower II; the two phases are subjected to countercurrent extraction in the extraction tower II; a tower top raffinate phase is introduced into a post-treatment process; and the tower bottom extraction liquid is the high-concentration hydrogen peroxide product. The high-efficiency extraction process provided by the invention is provided aiming at the defects of prior arts. The process has the advantages of high mass transfer rate, high Murphree efficiency, high product concentration, low raffinate content, and the like.

The invention relates to the technical field of fluorine chemical industry, and in particular relates to a direct separation method of a silicon tetrafluoride and anhydrous hydrogen fluoride mixed gas. The method comprises the following process steps: a, collecting a silicon tetrafluoride and hydrogen fluoride mixed gas, which is obtained by pyrolysis of fluosilicic acid, compressing through a compressor, entering a condenser 1, cooling, and entering obtained liquefied hydrogen fluoride to a condensate storage tank; b, feeding the cooled silicon tetrafluoride gas to a condenser 2, further cooling with an ethylene glycol-water solution, removing residual hydrogen fluoride to obtain a silicon tetrafluoride gas and entering a silicon tetrafluoride storage tank 1 to store; and c, carrying out rectification and purification on liquid phases in the step a and the step b, and controlling the operation pressure and the overhead condensation temperature of a rectifying tower to obtain the refined liquid hydrogen fluoride product. The method has the advantages of being feasible to operate, low in investment, low in energy consumption, and free of difficult-to-treat waste, and is an economical, efficient and environment-friendly separation method; and equipment is not corroded.

The invention provides a capacitive touch sensor. A single sensing unit structure of the capacitive touch sensor is triangular, and is composed of an upper polar plate, a lower polar plate and a dielectric layer. The upper polar plate and the lower polar plate are correspondingly arranged; the upper polar plate comprises three first polar plates, the lower polar plate comprises three second polarplates, the first polar plates and the second polar plates are isosceles triangles with vertex angles of 120 degrees, the vertex angles of the three first polar plates are oppositely arranged, top ends of the three second polar plates are connected with one another, and the three first polar plates and the three second polar plates jointly form three independent capacitors; and through a structural arrangement, the number of polar plates and the number of capacitors are reduced, and a measurement circuit is greatly simplified so that accurate measurement and decoupling of a three-dimensional force are realized.

The invention discloses a system and method for producing hydrogen peroxide through an anthraquinone method. The system comprises the four unit processes of hydrogen dissolving, hydrogenation, oxidation and extraction, wherein a hydrogenation unit comprises a series fixed bed and upflow-type tubular reactors, and working liquid and hydrogen are subjected to a hydrogenation reaction in the hydrogenation unit to obtain hydrogenation liquid; an oxidation unit comprises an oxidation tower, the hydrogenation liquid and oxygen-containing gas are subjected to an automatic oxidation reaction to obtainoxidation liquid; and an extraction unit comprises an extraction tower, hydrogen peroxide in the oxidation liquid is extracted by the water, and thus a high-concentration hydrogen peroxide product isobtained. According to the system and method, the anthraquinone hydrogenation reaction rate can be significantly improved, the anthraquinone hydrogenation reaction efficiency can be significantly improved, the uniformity of the reaction process is maintained, side reactions are less, the obtained hydrogenation liquid is good in quality, small in by-product number and low in viscosity, the gas-liquid mass transfer rate in the oxidation process is increased, the extraction efficiency in the extraction process is improved, the oxidation time is significantly shortened, and the number of actual tower plates of the extraction tower is decreased.

The invention discloses a device and a method for synthesizing trioxymethylene by salt effect reactive rectification. The device comprises a reactive rectification tower, an extraction tower, a concentration tower, a recovery tower and the like; the method comprises the following steps: (1) reacting and rectifying to generate a trioxymethylene synthetic liquid; (2) extracting the trioxymethylene synthetic liquid to obtain an extract phase rich in trioxymethylene and a raffinate phase rich in water and formaldehyde; (3) concentrating the raffinate phase to recover the formaldehyde solution; and(4) separating and recovering the extraction agent from the extraction phase to obtain a trioxymethylene product. The device and the method for synthesizing trioxymethylene by salt effect reactive rectification are high in formaldehyde conversion rate, high in production efficiency, high in trioxymethylene product purity, short in process and low in energy consumption, and have popularization andapplication performance.

The invention discloses a ring network cable reel distribution process. The ring network cable reel distribution process includes steps of calculating the minimum height Hmix from the top of a traveling track to a lead of a contact net in a whole wire region according to field measured data; determining the largest diameter Rmax of cable reels according to the Hmix value, the height H0 of a track flat car and the suspension height H1 of the cable reels on a cable paying-off rack; determining the largest axle distance Lmax of the cable reels according to the axle distance L0 of the paying-off rack; determining cable reel distribution length in the region according to measured cable path data in various regions; and distributing the determined cable reel distribution length to the cable reels with the axle distance of Lmax and the diameter of Rmax, and increasing cable distribution quantity of each cable reel to the greatest extent. The quantity of the cable reels and utilization quantity of intermediate heads of cables can be reduced. As the utilization quantity of the intermediate heads of the cables is reduced, fault points of the cables after live operation are reduced, and safety of the ring network cables after live operation is improved.

The invention discloses a separation method of a mixture of polyols with similar boiling points. Glycol containing dihydric fusels (1,2-butylene glycol and 1,2-butylene glycol) is adopted as the feedstock of a reduced pressure rectifying tower, and a weakly polar gaseous extraction agent is introduced to the bottom of the tower, so relative volatility between the 1,2-butylene glycol and 1,2-butylene glycol which have the same weak polarity and the glycol with strong polarity is improved, and the separation efficiency of rectification is improved. The invention provides a novel rectification method of the dihydric fusels from the glycol. The boiling point of the gaseous extraction agent is far lower than that of the dihydric alcohols, and the gaseous extraction agent is easy to separate and can be recycled, so the material consumption and the energy consumption in the separation process are reduced. The method allows the 1,2-butylene glycol and 1,2-butylene glycol to be separated from the glycol, and allows highly pure glycol and concentrated 1,2-butylene glycol and 1,2-butylene glycol byproducts to be obtained.

The invention relates to a stereo mass transfer liquid co-flow tower, which is a gas-liquid contact device used in processes of mass transfer, heat transfer and the like in the fields of chemical engineering, oil refining, petrifaction, pharmacy, environmental protection and the like. The tower comprises a tower body and multilayer continuous mass transfer tower plates; each layer of continuous mass transfer tower plate comprises a tower plate, a stereo mass transfer element and a down-flow system; and the down-flow system of the continuous mass transfer tower plate enables liquid on each layer of tower plate in the tower to flow in the same direction so that a retention area is not left on the tower plate, an effective mass transfer area is enlarged, the treatment capability is increased, the average push force of gas-liquid transfer on the tower plates is improved and the mass transfer efficiency of the tower plates is further improved.

The invention relates to a high-purity MTBE production process, which comprises: a, completely mixing C4 and partial methanol to form a homogeneous phase; b, carrying out an etherification reaction onthe obtained mixture; c, feeding the mixture after the reaction and the remaining methanol into a second static mixer; d, feeding the mixture from the second static mixer into a catalytic rectification tower, continuously carrying out a catalytic rectification reaction on the isobutene and the methanol in the mixture under the action of a catalyst to generate MTBE, and separating C4, methanol andMTBE through rectification; e, feeding the crude product obtained from the bottom of the catalytic rectification tower, and further purifying the MTBE product through rectification; and carrying outadsorbing refining on the product from the top of the rectification tower, such that it is ensured that the product can meet the quality requirement. According to the present invention, with the high-purity MTBE production process, the production of the high-purity MTBE is ensured, and the production process is simplified; and by using the adsorbing refining process, the number of the trays of therectification tower is reduced so as to reduce the energy consumption of the separation device.