155 results about "Distillation method" patented technology

The invention relates to the technical field of chemical metallurgy, and discloses a preparation and purification method of high-purity sponge vanadium, which comprises the following steps: preparing a vertical vacuum reduction furnace, adding a reducing agent, discharging air in the furnace, and introducing shielding gas; heating, adding vanadium chloride for smelting, taking out, putting into a distillation furnace, and carrying out heating and heat preservation treatment; and finally, putting the product into a crucible in an electron beam furnace, vacuumizing, heating and smelting, introducing protective gas into the electron beam furnace after smelting, and cooling to room temperature to obtain a sponge vanadium product. The high-purity sponge vanadium is prepared by adopting a novel vanadium chloride metal thermal reduction-distillation method, and the sponge vanadium is further purified through vacuum electron beam refining, so that the common technical problems of long flow, low product purity and the like of a traditional method for preparing the high-purity metal vanadium are solved.

The utility model discloses equipment for preparing high-purity halide wet electronic chemicals by adopting a sub-boiling distillation method, and belongs to the technical field of wet electronic chemicals. The device comprises a sub-boiling distiller, wherein a top outlet of the sub-boiling distiller is sequentially connected with a first-stage absorption system, a second-stage absorption system and a third-stage absorption system; the first-stage absorption system comprises a first-stage falling film absorber and a first-stage absorption tank, and the bottom of the first-stage falling film absorber is connected to the first-stage absorption tank; a top gas outlet of the first-stage falling film absorber is connected with the second-stage absorption system; the second-stage absorption system comprises a second-stage falling film absorber and a second-stage absorption tank, and the bottom of the second-stage falling film absorber is connected to the second-stage absorption tank; a top gas outlet of the second-stage falling film absorber is connected to a third-stage absorption system; the third-stage absorption system comprises an absorption tower; the sub-boiling distiller comprises a tower main body, a heating jacket is arranged at the middle lower part outside the tower main body, and the heating jacket is communicated with a circulating water pipeline. The device is low in heat source temperature, low in consumption and low in energy consumption.

The invention discloses an ammonia distillation method for a garbage incinerator SCR (Selective Catalytic Reduction) system. The problems that existing equipment is high in ammonia water steaming energy consumption and inconvenient to control are solved. The method comprises the following steps; the method comprises the following steps: S1, taking a 20-25% concentrated ammonia water solution as a raw material, and filling the concentrated ammonia water solution into a concentrated ammonia water storage tank for storage; s2, conveying 20-25% of concentrated ammonia water solution in a concentrated ammonia water storage tank into an ammonia distillation tower by using a first metering pump; ammonia gas in the concentrated ammonia water solution is separated out by using an ammonia distillation tower and is used for SCR (Selective Catalytic Reduction) denitration reaction; s3, dilute ammonia water generated at the bottom of the ammonia still is pumped out by a second metering pump and conveyed into a dilute ammonia water buffer tank for temporary storage, and the concentration of the dilute ammonia water is below 5%; s4, denitration is completed through a catalyst. The method has the beneficial effects that ammonia for SCR and SNCR in flue gas treatment equipment of the garbage incinerator is combined together, the ammonia still is used for separation and purification, ammonia gas is sprayed into the SCR, and raw materials of a reducing agent, the equipment cost and the operation cost are saved.

The dry granulation process comprises the following steps: directly using raw powder of pseudo-ginseng as a medicine, extracting volatile oil from turmeric and angelica sinensis by adopting a distillation method, and carrying out inclusion on the volatile oil by adopting beta-cyclodextrin so as to enhance the stability; motherwort, astragalus membranaceus, ligusticum chuanxiong hort, safflower carthamus, radix paeoniae rubra, radix paeoniae alba and radix cyathulae are decocted with water, so that the maximum use and quality stability of the medicinal materials are ensured. The dry granulation process is more matched with the characteristics of the product, and after the dry granulation process is changed into the dry granulation process, the steps of drying and total discharge in the original wet granulation can be removed, so that the production efficiency of the product is improved, the production process is easier to control, and the post operation is simpler.

The present invention introduces a capillary distillation method comprising the following steps: heating wastewater, subsequently directing the heated wastewater to one end of a water-diversion fiber material. Through capillary action, the heated wastewater permeates the water-diversion fiber material, diffusing downward along microchannel pathways within the material. Upon reaching the surface of the water-diversion fiber material, the wastewater evaporates. Water vapor is then directed to a condensation module, where it undergoes condensation and collection, resulting in the production of fresh water.

A manufacturing process of metal-organic framework porous material of aluminium and terephthalic acid comprises the steps of aluminium substrate synthesis with elution of aluminium ions from the aluminium substrate using a basic solution followed by adjustment of pH using an acidic solution; terephthalic acid synthesis from polyethylene terephthalate (PET) by distillation method in a basic solution followed by adjustment of pH using an acidic solution to yield terephthalic acid precipitate, filtering, drying and dissolving of the obtained terephthalic acid in a basic solution until equivalent; addition of the aluminium substrate for a reaction; separation of the obtained precipitate of the metal-organic framework porous material product from solution; and drying.

The invention provides a production method of high-purity sponge titanium. The production method comprises the following steps: firstly, obtaining refined magnesium and refined titanium tetrachloride after secondary refining; then feeding the refined magnesium and the refined titanium tetrachloride into a reactor subjected to titanizing treatment, and carrying out reduction and vacuum distillation in a protective atmosphere by adopting a reduction distillation method to obtain a sponge titanium lump; and finally, the sponge titanium lumps are subjected to surface impurity material stripping, then temperature-controlled crushing and screening are conducted, four-stage sorting including color sorting, magnetic sorting, winnowing and manual sorting is conducted, and the high-purity sponge titanium is obtained. According to the method, the refined titanium tetrachloride is used for purifying the crude magnesium, so that the high-purity production raw material is obtained; in the magnesiothermic reduction vacuum distillation process of titanium tetrachloride, a blocking method of impurities of Fe, Cr and Ni is adopted, and a pure sponge titanium lump is obtained; and identifying and separating high-iron, high-chlorine, high-oxygen and high-nitrogen impurity materials in the sponge titanium by adopting sorting methods such as color sorting, winnowing, screening, magnetic separation and the like to finally obtain the high-purity sponge titanium.

The invention discloses a method for preparing high-purity octamethylcyclotetrasiloxane, and belongs to the technical field of octamethylcyclotetrasiloxane purification. The invention treats crude octamethylcyclotetrasiloxane by combining distillation-adsorption-re-distillation, thereby overcoming the problem that trace impurities are difficult to be removed by a single distillation method. The distillation-adsorption-re-distillation method is combined for operation, and the advantages of each method are brought into play, and impurities such as hexamethylcyclotrisiloxane and decamethylcyclopentasiloxane with similar boiling points are reduced, so that the octamethylcyclotetrasiloxane product reaches a very high purity. The invention adopts an adsorption treatment method to adsorb and separate phosphorus-containing and boron impurities and metal impurities in alkane residues in the octamethylcyclotetrasiloxane, thereby obtaining electronic-grade octamethylcyclotetrasiloxane, and the product purity can reach more than 99.99%.

The invention discloses a process for extracting copper, lead and precious metals by a vacuum distillation method. The process for extracting the copper, lead and precious metals by the vacuum distillation method comprises the following steps: step 1, preparing and pretreating raw materials; 2, plasma pretreatment; step 3, carrying out segmented heating and rotary distillation; step 4, multi-stage condensation; 5, online monitoring is carried out; according to the technology for extracting the copper-containing, lead-containing and precious metal through the vacuum distillation method, metal steam with different boiling points can be accurately separated at different temperature sections through a multi-stage condensation system, follow-up purification steps such as cross contamination, multi-stage condensation and electrolytic refining between the metals are avoided, the purity of the metals can be remarkably improved, and the purity of the copper-containing, lead-containing and precious metal is improved. The final product is ensured to meet the high-quality standard; the boiling point of metal in a vacuum environment is reduced, energy consumption required by heating is reduced, the rotary distiller is used, raw materials are continuously turned over in the heating process, uniform heating is guaranteed, the evaporation efficiency is improved, and residues are reduced.

The invention discloses a rectification method for efficiently producing high-purity methanol by using low-temperature heat. According to the technology, a pressurized tower and an atmospheric tower are connected in parallel, so that crude methanol from a pre-tower kettle enters the two towers in a split-flow manner, low-temperature heat is used for supplying heat, and steam at the top of the pressurized tower serves as a heat source of a reboiler of the atmospheric tower; a tower section heat exchanger which can be flexibly arranged is arranged in the vacuum tower to utilize low-temperature heat; and thirdly, a recovery tower is changed into a vacuum tower, and low-temperature heat is used as a heat source of a reboiler. The technology can be flexibly implemented partially or completely, and a remarkable energy-saving effect can be achieved. The embodiment shows that the technology can stably produce high-precision methanol with the ethanol content as low as 10 ppm or below, the fresh steam consumption per ton of methanol is reduced to 0.2 ton or below, the productivity of the device can also be improved, and compared with a traditional four-tower double-effect rectification technology (the ethanol content is about 50 ppm, and the fresh steam consumption per ton of methanol is 1.0-1.2 tons), the technology has remarkable advantages in the aspects of product purity reduction and energy consumption reduction. The method effectively solves the problems of difficult production of high-precision methanol, high energy consumption and insufficient utilization of low-temperature heat in the prior art, and has good economic and environment-friendly benefits.

The invention discloses a hyperforin perforatum extract and a preparation method thereof. The preparation method comprises the following steps: A / firstly, cleaning and screening collected hyperforin perforatum herbs, and drying the screened hyperforin perforatum; b, pretreating the clean and dry hyperforin perforatum raw material, and crushing the hyperforin perforatum raw material by using a coarse crusher to prepare the hyperforin perforatum raw material into a powder state suitable for extraction; c, mixing the crushed hyperforin perforatum powder with an acetone solvent, and dissolving effective components in the hyperforin perforatum in a soaking manner to obtain a leaching solution; according to the method, the hyperforin perforatum is dissolved and extracted through the acetone solvent, and effective components, flavonoid compounds, volatile oil and other active substances in the hyperforin perforatum can be effectively dissolved, so that a relatively high extraction rate can be obtained, and the purity and quality of the hyperforin perforatum extract can be improved; acetone can be recycled and reused through a distillation method, so that the solvent consumption and the cost in the extraction process are reduced.

The continuous production heat pump assisted integrated extractive distillation device is adopted to realize high-purity separation and recovery of the diethyl ether-methyl formate-n-pentane azeotrope, and separation is realized by utilizing the characteristic that the extraction agent has great influence on the relative volatility of the diethyl ether-methyl formate-n-pentane azeotrope. The purity of the separated diethyl ether, n-pentane and methyl formate reaches 99.9% or above, high-purity recycling of the extraction agent can be achieved, the separation cost is greatly reduced, and the method is low in energy consumption and flexible to operate.

A distillation method includes supplying a batch type distillation column with a liquid that is a process fluid; increasing pressure and temperature of a fluid, with a compressor and supplying the fluid to a reboiler; exchanging heat in the reboiler between the liquid, which has been supplied to the distillation column, and the fluid, which has been increased in pressure and temperature, to heat the liquid and acquire overhead vapor and to condense the fluid; delivering the overhead vapor to a condenser and condensing the overhead vapor into a condensate through heat exchange, removing the condensate; removing residual liquid from the distillation column; and regulating pressure of the distillation column to distill the liquid with heat generated by a heat pump operated over a narrower temperature rising range in the pressure-temperature increasing step.

The invention relates to the technical field of distillation, in particular to a distillation device for production and collection of triisopropyl borate and a distillation method.The distillation device comprises a distillation device body, the distillation device body comprises a distillation retort, the distillation retort comprises a retort body and a cover body internally provided with a rotating core structure, and the rotating core structure is composed of a mixing component and a guiding component which are coaxially connected; the mixing part is of a hollow spiral structure, and the guiding part is of a solid spiral structure. Heat generated by the spiral heating pipe in the wall of the tank body and the annular heat-conducting oil disc at the bottom can be quickly conducted into materials in the distillation cavity through a through heat conduction channel in the hollow mixing screw piece, the drainage screw piece rotates to drive the heated gaseous materials to form a spiral ascending flow field, and the spiral ascending flow field is formed by combining an umbrella-shaped flow guide cover; steam can be directionally guided to a gas state conveying opening, and disordered diffusion and reverse mixing of the steam are reduced; in addition, the raw materials directly enter the gas-liquid balance area through the middle feeding port, and the back-mixing probability is further reduced.

This invention relates to the field of separation and purification, and particularly to a distillation method for Forsythia suspensa volatile oil, comprising the following steps: Step (1) Crush dried Forsythia suspensa fruit and mix it with water at a mass ratio of 1:3-5, grinding until the particle size D90≤50μm to obtain Forsythia suspensa slurry; Step (2) Add porous medium A particles with a particle size of 0.5-1mm and water-absorbing medium B to the Forsythia suspensa slurry obtained in Step (2), stir and mix for 20-40min to obtain a cake; Step (3) Mix the cake with moistened porous medium C particles with a particle size of 1-3cm, then load it into a distillation kettle for distillation, collect the distillate and separate to obtain Forsythia suspensa volatile oil. This scheme optimizes the distillation process, improves distillation efficiency, and solves the clogging problem caused by excessively fine grinding of raw materials, thereby meeting the industrial production demand for efficient and stable extraction of Forsythia suspensa volatile oil.

This invention discloses a method for preparing high-purity Si-75, comprising: S1, adding sodium sulfide, sulfur, and deionized water in a molar ratio of 1:(1.0~1.1):(5~8) to a reaction vessel, adding a buffer, and reacting at 80~90℃ for 1~2h; S2, adding a phase transfer catalyst and a hydrolysis inhibitor to the system, adding γ-chloropropyltriethoxysilane dropwise, and reacting at 85~95℃ for 3~5h, allowing the mixture to stand and separate into layers after the reaction, to obtain an organic phase; S3, subjecting the organic phase to short-path distillation and then filtering to obtain high-purity Si-75. Compared with existing technologies, this invention uses a phosphorus-free buffer system, which simplifies waste treatment. It uses water as the reaction medium and does not use large amounts of organic solvents, making it suitable for continuous industrial production. By adding hydrolysis inhibitors, hydrolysis can be effectively prevented during the reaction, increasing safety. The short-path distillation method provides high purification efficiency and can quickly remove impurities. The product has a disulfide content of ≥98.5% and a color of 0 (Gardner color number), which is of great significance to the light-colored rubber industry.

The application provides a purification method and dichloroisocyanurate obtained by using the method. The purification method of dichloroisocyanurate comprises the following steps: repeatedly crystallizing crude dichloroisocyanurate obtained in a production synthesis process to obtain purified dichloroisocyanurate. The purification method of dichloroisocyanurate of the application utilizes the different melting points of dichloroisocyanurate and other impurities, and is designed to be repeatedly crystallized at different gradient temperatures. By adjusting the crystallization temperature and the crystallization time, the impurities in the dichloroisocyanurate can be removed. Compared with the crude distillation method, the obtained dichloroisocyanurate has higher purity, and is safer and easier to operate.

The embodiment of the present application belongs to the technical field of seawater desalination, and particularly relates to a seawater distillation module, a seawater distillation device, a seawater distillation system and a distillation method. The seawater distillation module comprises a material liquid layer, an air gap layer, a gas permeable layer and a condensation layer. The material liquid layer has an inlet liquid side for guiding seawater to enter and an outlet liquid side for guiding seawater to flow out. The air gap layer is arranged opposite to the material liquid layer. The gas permeable layer is arranged between the material liquid layer and the air gap layer, and is used for separating the material liquid layer and the air gap layer. The gas permeable layer is used for allowing the seawater in the material liquid layer to pass through after being heated, and enter the air gap layer. The condensation layer is used for condensing the water vapor entering the air gap layer, so as to produce fresh water. Compared with the prior art, the seawater distillation device can meet the production of fresh water in island reef areas.

The application discloses a distillation device and method for nitric acid purification, and relates to the technical field of nitric acid distillation.The distillation device for nitric acid purification comprises a device frame, a motor is fixedly installed above the device frame, an exhaust pipe is fixedly installed on the circumferential surface of the device frame, a feed pipe is fixedly penetrated through the circumferential surface of the device frame, an air outlet pipe is fixedly penetrated through the circumferential surface of the device frame, a condenser pipe is fixedly installed in the device frame, and the device frame is internally provided with a rotating rod, a connecting pipe, a rotating shaft, a fan blade, a convex plate, a supporting block, a connecting plate, a sleeve, a circular plate, an arc block, a supporting plate and an arc plate.The rotating rod is fixedly installed at the output end of the motor, the connecting pipe is fixedly installed in the device frame, and the rotating shaft is rotatably installed on the circumferential surface of the connecting pipe.The distillation device for nitric acid purification realizes the up-and-down movement of the fan blade while rotating, prevents the internal stratification of nitric acid, and causes incomplete distillation.

The invention discloses a radioactive organic waste liquid rectification device and rectification method, and belongs to the technical field of radioactive waste treatment. Comprising a waste liquid storage tank, a feed liquid delivery pump, short-range molecular distillation equipment, a TBP storage tank, a kerosene storage tank, a first cold trap, a second cold trap, a first-stage filter, a second-stage filter, a heating circulator, a low-temperature circulator, a first cold trap residual liquid collecting tank, a second cold trap residual liquid collecting tank and a vacuum pump, according to the invention, thermal separation of the medium-low radioactive organic waste liquid TBP / OK, low reaction temperature of short-path molecular rectification equipment and rectification of heat-sensitive and high-boiling-point liquid such as the TBP / OK organic waste liquid can be realized under low pressure, the device has the advantages of simple structure, reduced process control points, low energy consumption, high treatment efficiency and safety in operation, radioactive substances after rectification are mainly concentrated in concentrated TBP / OK, and the production cost is reduced. And the nuclear waste treatment cost can be greatly saved, and great economic benefits are achieved.

The embodiment of the invention relates to the technical field of low-temperature rectification, in particular to a low-temperature rectification system and a low-temperature rectification method.The system comprises a condensation part used for conducting gas-liquid separation on tower top process materials and conveying liquid materials to a reboiling part, and steam is conveyed to a first heat regeneration part; the first heat regeneration part and the second heat regeneration part are used for heating the steam to a preset temperature; the compression assembly is used for compressing steam and conveying the steam to the reboiling part and the first heat exchange part; the reboiling part is used for heating the liquid material to gasify the liquid material and conveying the gas material to the condensing part; the first heat exchange piece is used for heat exchange of steam; the first heat exchange piece and the reboiling piece are used for conveying liquid materials into the first heat return piece to be cooled, and the circulation driving piece is used for circulating the materials to the condensation piece. According to the low-temperature rectification system, heat can be provided for the reboiling part, the energy consumption of the reboiling part is reduced, cold energy can be provided for the condensation part, the energy consumption of the condensation part is reduced, and then the energy consumption of the whole low-temperature rectification system is reduced.

This invention discloses an energy-saving five-tower methanol distillation method based on multi-effect thermal coupling. Crude methanol is fed to a pre-tower for distillation; the bottom product of the pre-tower is fed to an atmospheric distillation tower, the bottom product of the atmospheric distillation tower is fed to a negative pressure distillation tower, and the bottom product of the negative pressure distillation tower is fed to a pressurized distillation tower; the bottom product of the pressurized distillation tower is fed to a secondary pressure distillation tower; refined methanol is collected from the tops of the pressurized distillation tower, the atmospheric distillation tower, the negative pressure distillation tower, and the secondary pressure distillation tower; the top product of the pressurized distillation tower heats the reboiler of the secondary pressure distillation tower, and the top product of the secondary pressure distillation tower heats both the reboilers of the pre-tower and the atmospheric distillation tower; the top products of the pre-tower and the atmospheric distillation tower heat the reboiler of the negative pressure distillation tower. This process improves the heat recovery efficiency within the system, significantly reduces the condensation load of the top vapor, lowers the overall energy consumption of the distillation process, and achieves efficient multi-stage heat recovery and utilization within the system, reducing the ethanol content in the refined methanol product and improving methanol recovery efficiency.

The invention discloses a preparation method for continuous production of phosphorus trifluoride, and belongs to the technical field of chemical synthesis, and the key point of the technical scheme is that the preparation method for continuous production of phosphorus trifluoride comprises the following preparation steps: S1, adding phosphorus trichloride into the upper part of a rectifying tower, adding anhydrous hydrogen fluoride gas into the lower part of the rectifying tower, and stirring; contacting the two raw materials on the surface of the rectifying tower filler to complete reaction; s2, a product obtained through reaction is discharged from the top of the rectifying tower and enters a purification system, and phosphorus trifluoride is obtained.When phosphorus trifluoride is prepared through the rectifying method, the reaction process is stable, the temperature is easy to control, the gas-liquid contact area is large, the reaction is complete, the reaction speed is high, and large-batch production is facilitated.

A micro-distillation device comprises: a distillation unit including a liquid introduction port for introducing a mixed liquid containing at least two components having different boiling points, a vapor introduction port for separately introducing vapors originating from the mixed liquid, a gas-liquid contact flow path in which the mixed liquid introduced from the liquid introduction port and the vapor originating from the mixed liquid introduced from the vapor introduction port are brought into contact with each other in counterflow, a liquid discharge port for discharging the mixed liquid flowing through the gas-liquid contact flow path, and a vapor discharge port for discharging the vapor originating from the mixed liquid flowing through the gas-liquid contact flow path; a first circulation unit in which a condensate obtained by condensing the vapor originating from the mixed liquid discharged from the vapor discharge port is circulated to the liquid introduction port; and a second circulation unit in which a vapor obtained by evaporating the mixed liquid discharged from the liquid discharge port is circulated to the vapor introduction port.

The utility model discloses a novel motherwort biochemical mixture distillation extraction device in the related technical field of veterinary drug production, which comprises a distillation box and a filter box, the top of the distillation box is provided with an upper top cover, the upper top cover is provided with a hanging ring, the inner bottom of the distillation box is provided with a heater, and the filter box is provided with a filter screen. A limiting sleeve is arranged on the inner side of the lower portion of the distillation box, a supporting block is arranged on the inner side of the limiting sleeve, a containing basket is placed on the supporting block, a partition supporting plate is arranged at the position, close to the upper portion, in the containing basket, and the partition supporting plate is rotationally connected with a containing basket body through a rotation matching base. According to the utility model, the containing basket is arranged in the distillation box, and the separation supporting plate which is rotatably mounted is arranged in the containing basket, so that medicinal raw materials can be classified and placed according to the leaching temperature conditions of different medicinal materials, and two distillation modes of water boiling and steam fumigation are divided, so that medicinal components in the medicinal materials are fully released.

The invention discloses a vacuum distillation device and a distillation method, belonging to the technical field of distillation devices, wherein the vacuum distillation device comprises a tank body for distillation, a water tank is arranged below the tank body, a partition is slidably arranged between the tank body and the water tank, a fixed pipe is installed on the tank body, a sleeve is rotatably installed on the partition, and a base is arranged in the water tank; the water volume in the water tank can be adjusted by cooperating with the set guide pipe and the fixed pipe, when the water volume in the water tank is small, the sleeve can drive the guide pipe to rotate during the counterclockwise rotation process, and in the process of multiple alignment of the through hole and the guide hole, the water on the top of the partition can flow back into the water tank, so that the water level in the water tank is higher than the liquid level of the raw material in the tank body, therefore, the water tank can be replenished with water in time by utilizing this structure, which is beneficial to uniformly heating the raw material in the tank body.

A distillation device includes a batch type distillation column, a reboiler that heats and vaporizes liquid, which is a process fluid supplied to the distillation column, into vapor, a displacement compressor that draws in fluid for heating the liquid and increases the fluid in pressure and temperature, and supplies the fluid to the reboiler, a condenser that condenses overhead vapor of the distillation column into a condensate, a distillate withdrawal portion that removes the condensate condensed by the condenser, and a discharged liquid withdrawal portion that removes residual liquid from the distillation column. The compressor includes an actual volume flow rate regulation mechanism that varies an actual volume flow rate of the fluid, which is increased in pressure and temperature by the compressor, in accordance with a change in a required heating temperature of the reboiler during operation of the distillation device.

The present invention relates to a method for cleaning rock samples from petroleum systems based on the use of nanofluids, which is able to significantly accelerate the process. The developed method combines the solubilization potential of nanofluids for oil under the temporary action of an ultrasound system, which is faster and more effective than the traditionally used distillation methods described in the prior art. The adopted process reduces the time required for the removal of oil and salts (a key step in the characterization process of rock samples, which usually takes 120 to 365 days) to 3 to 7 days, using water-based nanofluids of low toxicity that do not alter the properties of the rock.

The invention belongs to the technical field of drilling fluid measurement, and particularly provides an optical measurement device and measurement method for the solid phase content of composite brine drilling fluid, a multi-wavelength laser emits a light beam, the light beam passes through a sample test bench, a cuvette and a drilling fluid sample in the cuvette, and then enters a photoelectric detector; the photoelectric detector is used for measuring the transmission light intensity of the drilling fluid sample in the sample test bench, and the data acquisition display is used for acquiring and transmitting the transmission light intensity of the measured drilling fluid sample to SCOM calculation processing software of the computer; the problems that when an existing composite brine drilling fluid adopts a distillation method to measure the insoluble solid content, the measurement process is complex, distillation and titration experiments consume a long time, and the measurement error is large are solved. According to the method, the influence of precipitation of inorganic salt or organic salt in the distillation process on solid phase content measurement when the solid phase content of the composite brine drilling fluid is measured by a traditional distillation method is eliminated, the measurement process is simplified, the measurement time is shortened, and the measurement precision and the measurement efficiency are improved.

Title of the invention: Method for defrosting an air separation apparatus by cryogenic distillation. During the defrosting of an air separation apparatus by cryogenic distillation, defrosting gas is sent to a heat exchanger (15) and from the heat exchanger to the top of a column (21) via a line (C6) used in normal operation to draw nitrogen, entering the column, defrosting gas is drawn from the tank of the second column via a line and sent to the heat exchanger and then to the air, a flow of defrosting gas is sent to the top of another column via a line (C7) at a temperature above 0°C, defrosting gas is drawn from the other column via the line used in normal operation to send air to the other column, sent to the heat exchanger and sent to the air. Abstract figure: Fig. 2