34results about How to "Lower latent heat of vaporization" patented technology

The composite modifying catalyst for alcohol-ether fuel is compounded with zinc peroxide 5-15 weigh portions, dimethyl carbonate 15-35 weigh portions, vat yellow GCN 5-15 weigh portions, cyclohexylamine 3-10 weigh portions, and isooctyl nitrate 15-30 weigh portions, and through mixing at normal temperature. The alcohol-ether fuel with the composite modifying catalyst may have great methanol adding ratio while ensuring the combustion efficiency, fuel consumption, dynamic performance and other indexes.

The invention provides an absorption distillation method for using adsorption resin to treat waste water containing dimethyl formamide, belonging to the technical field of treatment of waste water containing dimethyl formamide, and solving the defects of the multi-column distillation and extraction-distillation process in prior art. The absorption distillation method for using adsorption resin totreat the waste water containing dimethyl formamide comprises the steps of using macroporous absorption resin to absorb before distillation of the waste water containing dimethyl formamide, using desorption agent to desorbing the resin, getting the mixed liquid of dimethyl formamide DMF and the desorption agent, delivering the mixed liquid into a rectifying column to implement normal pressure separation or reduced pressure separation, and getting the distillated dimethyl formamide DMF from the bottom of the rectifying column. Compared with the prior art of DMF waste water energy-saving recovery, the invention further reduces DMF recovering energy consumption without causing secondary pollution under the condition of ensuring high DMF recovery ratio, and has good practicality and economic performance.

The invention discloses a method for preparing ethyl caproate by continuous esterification, which comprises the following steps of: mixing caproic acid and ethanol in the mol ratio of 1: (1-1.5), then preheating, esterifying by a fixed bed catalyst layer, then entering an ethanol fractionating tower, extracting 95%(V / V) alcohol obtained at the tower top, using the 95%(V / V) alcohol as a mixture and recycling; discharging the caproic acid and water from the tower bottom, separating out the caproic acid and recycling again; and leading out the total liquid phase from the position above a feed opening in the middle of the tower and naturally layering, wherein the upper layer is the water which reflows into the tower, and the lower layer is an ethyl caproate crude product which is extracted and refined separately. The method has the advantages that the method can operate within a wider esterification range without considering the conversion rate of the caproic acid; the unreacted caproic acid is separated from the water, thereby avoiding the defects of influencing the flavor of the ethyl caproate and reducing the yield caused by blackening and coking of the caproic acid due to heating when in conventional production and recovery; a neutralization washing work procedure is saved, and no neutralizing waste water exists; and the production efficiency is high.

The invention relates to application of a convectional heat transfer mode to the material freeze drying process. An application method is mainly characterized in that in the traditional freeze drying process, when solid water (or other solvents) starts to vaporize, a proper amount of steam is led to give steam latent heat to the solid water, so that the solid water is sublimated to vapor in an accelerated mode; and meanwhile, by utilizing kinetic energy which is released when the steam expands instantly, the vapor gets rid of the restraint of surface tension and quickly flees from the surfaces of materials to be discharged out of a freeze drying cavity, and therefore the purposes of achieving complete freeze drying and shortening the drying time are achieved.

The present invention relates to applications of a convection heat transfer method in a dianhydrodulcitol freeze drying process. According to the present invention, by using the convection heat transfer type freeze drying preparation method of the dianhydrodulcitol freeze drying powder, drying is performed according to the predetermined freeze-drying process to obtain the freeze drying product of the dianhydrodulcitol or the composition thereof, the melting point is high and is in the range of 99.5-103.5 DEG C, the time for achieving the complete freeze-drying state is short, the freeze drying product is the loose amorphous body, the melting point is not changed after the freeze drying product is stored for 200 days at a room temperature in a sealed manner, and the quality stability of the freeze drying product of the present invention is significantly superior to the quality stability of the dianhydrodulcitol freeze drying powder prepared in the prior art.

The invention discloses a box-type vacuum drying device for urban sludge, which comprises a drying box connected with a vacuum pump; the drying box is provided with an air distribution plate to divide it into an upper material delivery area and a lower air supply area The air distribution channel is arranged on the air distribution plate; the material conveying system is arranged in the material conveying area, and the heat exchanger is installed in the air supply area. The air channel leads into the material conveying area to heat and dry the materials conveyed by the material conveying system; the drying box is also connected with a hot air circulation system. The invention is suitable for drying urban sludge, provides favorable material conveying conditions and heat medium pressure, temperature, and wind conditions for sludge drying, improves sludge drying rate, and has good environmental protection without foul smell in the drying process.

The invention discloses an ethane recovery method using a combination of pre-pressurization and propane refrigeration, belonging to the technical field of natural gas processing. The method is established on the basis of a conventional ethane recovery process; directed at the characteristic that a low-pressure rich gas ethane recovery process has great demand for cooling capacity, the method adopts the combination of feed gas pre-pressurization and propane refrigeration; so the refrigerating capacity of an expansion machine can be increased under the working condition that the pre-cooling capacity of the feed gas is insufficient, and the ethane recovery process has a high ethane recovery rate (greater than 95%) under a low-pressure rich gas working condition. According to the method, a compressor is arranged at a process inlet to pressurize the feed gas, so latent heat of vaporization of the feed gas is effectively reduced in a high-pressure state, cooling quantity required by precooling of the feed gas is reduced, and the circulation quantity of propane is reduced; and thus, the energy consumption of a refrigeration cycle compressor and total energy consumption of the process arereduced under the condition that high ethane recovery rate is guaranteed. Meanwhile, compared with an ethane recovery process with the same ethane recovery rate and with a stepped refrigeration cycleor mixed refrigerant cycle, the whole process structure of the method in the invention is greatly simplified, and the design and operation of the method are easy.

The invention relates to a butanediol spraying vacuum pump. The pump of the invention is characterized in that a primary butanediol sprayer is connected with a lower portion of a primary condenser, an upper portion of the primary condenser is connected with an upper portion of a secondary butanediol sprayer, a lower portion of the secondary butanediol sprayer is connected with a lower portion of a secondary condenser, an upper portion of the secondary condenser is connected with an upper portion of a third butanediol sprayer, a lower portion of the third butanediol sprayer is connected with a lower portion of a third condenser, an upper portion of the third condenser is connected with a lower portion of a fourth butanediol sprayer, a third auxiliary steam sprayer is communicated with an upper end of the third condenser, an upper portion of the fourth butanediol sprayer is communicated with an upper portion of a fourth condenser, a lower portion of the fourth condenser is connected with a vapor-liquid separator by a liquid-ring vacuum pump, one end of a heat exchanger is communicated with the liquid-ring vacuum pump and the other end of the heat exchanger is communicated with the vapor-liquid separator. The butanediol spraying vacuum pump has the advantages that: no waste liquid is discharged; the energy consumption is reduced; the steam spray vacuum pump in the invention has no moving part during runtime, the butanediol spraying vacuum pump is suitable for long-term and continuous operation, and the maintenance period is prolonged.

The invention relates to a treatment method and a device for producing high-salt wastewater from PAO. The device mainly includes five regions: a process intensification zone, a multi-stage vaporization zone, a crystallization separation zone, an azeotropic distillation zone and an anaerobic treatment zone. The strengthening zone mainly includes liquid distributor I, packing and field effect processor, etc. The wastewater is strengthened under the action of packing and field effect; the liquid distributor II is set up in the multi-stage vaporization zone, and the liquid distributor II is the boundary. It is divided into I-level vaporization zone and II-level vaporization zone; the vaporized concentrate enters the crystallization separation zone, and the miscellaneous salts in the vaporized concentrate are crystallized; the vaporized vapor enters the azeotropic distillation zone after condensation, and n-butanol is separated; recovery After n-butanol, the aqueous phase enters the anaerobic treatment zone for treatment. The invention can efficiently desalinate and reduce COD, and reduce crystallization energy consumption and equipment corrosion, and at the same time of high-efficiency desalination, the recovery and utilization of azeotrope can also be realized, and the economy of the process is improved.

The invention discloses a segmented water removing and drying system for high-humidity coal and an application method for the segmented water removing and drying system. The system comprises a discharging mechanism. A first microwave drying mechanism is arranged below the discharging mechanism and internally provided with a first conveying mechanism. A solid-liquid separation mechanism is arranged at the tail end of the first conveying mechanism. A second conveying mechanism is arranged at an outlet of the solid-liquid separation mechanism. A second microwave drying mechanism is arranged at the tail end of the second conveying mechanism. The segmented water removing and drying system has the beneficial effects that a microwave heating manner and a non-heating manner are combined with the water removing and drying technology, a heat water removing manner and a non-heat water removing manner are organically combined, water in coal is removed in the form of a liquid state on the basis of low-rank coal microwave drying, and energy consumption of a microwave drying system is greatly reduced; raw coal is heated through the reutilization of residual heat and waste heat generated by the drying system, and the economical efficiency of the whole drying system is improved; and after deep drying is carried out, utilization of later finished coal is more flexible and safer, and the processing cost is reduced.