52 results about "Fractionating column" patented technology

Processes and apparatuses for treating NOx from a carbon dioxide stream. Prior to separating carbon dioxide and NOx, NOx is converted to nitrogen gas in an NOx conversion zone, which may include an SCR reactor and / or CO boiler. A carbon separation zone which may include one or more fractionation columns produces a CO2 stream and an NOx stream. The NOx is passed back to the NOx conversion zone.

Processes and apparatuses for treating NOx from a carbon dioxide stream. Prior to separating carbon dioxide and NOx, NOx is converted to nitrogen gas in an NOx conversion zone, which may include an SCR reactor and / or CO boiler. A carbon separation zone which may include one or more fractionation columns produces a CO2 stream and an NOx stream. The NOx is passed back to the NOx conversion zone.

The utility model relates to the technical field of chemical production equipment, and discloses a high-boiling-point aromatic hydrocarbon fractionating tower device with a self-cleaning function, which comprises a shunting tower main body, cleaning and draining mechanisms are arranged at the upper end and the lower end of the shunting tower main body, the shunting tower main body comprises a tower body, and a first assembly hole is formed in the center of the top end of the tower body; a plurality of second assembly holes are formed in the periphery of the top end of the tower body at equal angles, and four drain outlets are formed in the periphery of the inner bottom wall of the tower body at equal angles. According to the utility model, the design of a spraying mechanism for optimizing cleaning liquid is adopted, the annular high-pressure spraying machine is arranged at the top end of the tower body, the plurality of high-pressure nozzles are annularly arranged at the bottom end of the tower body at equal angles, and the number and the distribution density of the nozzles are increased, so that multi-directional spraying is realized, the cleaning liquid can reach each corner in the tower, and the cleaning effect is enhanced; in addition, four sewage draining outlets are annularly formed in the bottom end of the tower body at equal angles, so that waste water and waste can be quickly discharged after cleaning, and convenience is achieved.

This document discloses a system and method for separating cracked hydrocarbon mixtures. A main fractionation column separates the cracked hydrocarbon mixture into top, side, and bottom fractions containing C1 to C6+ hydrocarbons. A top condenser and high-pressure separation system partially condenses the top fraction and compresses the uncondensed vapor to produce a compressed gas fraction and a compressed liquid fraction. A first distillation column receives the compressed liquid fraction and separates it into a first top vapor and a first bottom fraction. A second distillation column separates the first bottom fraction into a second top fraction and a second bottom fraction. An absorber receives a portion of the second bottom fraction and the side liquid fraction and contacts it in countercurrent flow with the compressed gas fraction, thereby producing an absorber top fraction and absorber bottom fraction containing exhaust gas. Such a system can be used to integrate existing FCC / RFCC units with petrochemical complexes.

Process for the production of a product 2-alkylalkanol stream A process for the production of a product 2-alkylalkanol stream is disclosed. The process comprises feeding a polished 2-alkylalkanol stream to a lights removal distillation column. A lights stream is withdrawn from at or near the top of the lights removal distillation column and a heavies containing stream is withdrawn from a first position at or near the bottom of the lights removal distillation column. The product 2-alkylalkanol stream is withdrawn as a liquid side draw from a second position above the first position.

The present invention relates to a process for preparing one or more ethers, the process comprising (i) preparing a feed stream comprising an alcohol, an epoxide, and a catalyst; (ii) feeding the feed stream prepared in (i) into a reactor, and subjecting the feed stream to reaction conditions, obtaining a product stream comprising the one or more ethers; (iii) feeding the product stream obtained from (ii) into a first fractionating column, and separating the product stream into a first overhead stream and a first bottoms stream; (iv) preparing a first H2O-containing stream; (v) transferring heat from the first overhead stream obtained from (iii) to the first H2O-containing stream prepared in (iv), obtaining a heated first H2O-containing stream and a liquid first over-head stream. It has been surprisingly found that by integrating an open loop heat pump in the process for preparing one or more ethers, a portion of the heat can be recovered by heat transfer to an H2O-containing stream.

The utility model relates to the technical field related to air treatment, one embodiment of the utility model provides a multifunctional fractionating tower which comprises a tower body and a top cover, the top cover is arranged at the top of the tower body, a condensed gas inlet pipe and a liquid nitrogen inlet pipe are arranged on the outer wall of the tower body, a fractionating treatment assembly is arranged in the tower body, a liquid nitrogen treatment assembly is arranged on the tower body, and the liquid nitrogen treatment assembly is arranged on the tower body. The fractionation treatment assembly comprises a plurality of tower plates which are sequentially arranged at the two ends of the inner wall of the tower body downwards, flow distribution plates are arranged on the side surfaces of the tower plates, and a plurality of flow distribution grooves are formed in the surfaces of the tower plates. According to the technical scheme, the technical problems that in the prior art, a traditional fractionating tower is poor in performance in the aspect of energy consumption, a large amount of energy needs to be consumed in the air treatment process, the energy utilization efficiency of the fractionating tower is low, and consequently the production cost is high are solved.

The utility model discloses a fractionating tower for petroleum refining, which belongs to the technical field of petroleum processing equipment and comprises a fractionating tower body for petroleum refining and processing and a circular fixing seat for fixing, the bottom of the fractionating tower body is connected with the top of the fixing seat, and a square plate and a long plate are symmetrically arranged on two sides of the fixing seat respectively; a water tank is fixed to the top of the square plate and communicated with the condensation column through a connected water pipe, the top of the long plate is connected with a heating box used for preheating crude oil, and the heating box is located below the condensation column. A condensing pipe for circulating condensed liquid is arranged in the condensing column in a penetrating manner, one end of the condensing pipe is connected with the side wall of the fractionating tower body, and a movably connected cover plate is arranged at the top of the fractionating tower body. According to the petroleum refining device, petroleum refining processing can be accelerated through the arranged condensate water, a petroleum stock solution can be preheated through the temperature carried by the condensate water, energy loss is reduced, and the practicability of the device is improved.

The invention relates to the technical field of coal chemical industry separation, in particular to a coal liquefaction oil-water separation system and method, and the system comprises an oil phase separation unit, a distillation unit, a cooling condensation unit, an oil-water separation unit and a power unit; the oil phase separation unit is used for separating materials to obtain a water-containing oil phase; the distillation unit is used for carrying out evaporation treatment on a water-containing oil phase; the cooling and condensing unit is used for cooling water vapor when the water-containing oil phase is subjected to evaporation treatment to form an oil-water mixture; and the oil-water separation unit is used for separating an oil phase, phenol-containing sewage and gas-phase light hydrocarbon from the oil-water mixture. The system can wash pulverized coal carried in a gas phase, can also reduce the temperature of the gas phase at the top of the normal-pressure fractionating tower so as to reduce the load of an air cooler, prolong the service life of the air cooler, improve the separation efficiency and separation effect of the normal-pressure fractionating tower, and can also prevent excessive condensation of heavy components, thereby improving the balance of mass transfer and heat transfer in the tower and improving the separation efficiency and separation effect of the normal-pressure fractionating tower. And stable operation of the fractionation process and product quality are improved.

The utility model relates to the technical field of mineral oil processing, and provides a device for precisely fractionating waste mineral oil, which comprises a fractionating tower and a position blocking plate, a plurality of output pipes which are uniformly distributed are arranged on the fractionating tower, a plurality of mark inserting grooves matched with the output pipes are fixedly connected to the outer wall of the fractionating tower, and mark plates are inserted into the mark inserting grooves. The blocking plate is rotationally connected to the top end of the label inserting groove, a positioning groove is formed in the top end of the label inserting groove, a first magnetic attraction piece is arranged on the inner lower side wall of the positioning groove, a containing groove matched with the positioning groove is formed in the bottom end of the blocking plate, a through hole is formed in the inner upper side wall of the containing groove, and a control rod is slidably connected into the through hole. And the bottom end of the control rod is fixedly connected with a positioning rod slidably connected with the containing groove, the bottom end of the positioning rod is provided with a second magnetic attraction piece matched with the first magnetic attraction piece, and the top end of the control rod is provided with a stop block, so that the purposes of conveniently replacing the marking plate and improving the working efficiency are achieved.

The utility model relates to the field of coking equipment, concretely relates to a special circulating oil adjusting device for production of needle coke. The special circulating oil adjusting device includes: a fractionating column, has the bottom, and is provided with circulating oil oil collecting tank for containing circulating oil above the bottom, circulating pipeline, including the out -of -tower pipeline and the tower inlet pipeline that communicate with circulating oil oil collecting tank and circulating oil pump that links to each other with the out -of -tower pipeline and the tower inlet pipeline, tower bottom pipeline, communicates circulating oil pump with the bottom, and is provided with flow control valve on the tower bottom pipeline. The special circulating oil adjusting device for production of needle coke of the utility model adds independent circulating pipeline, can directly inject circulating oil into the fractionating column bottom, thereby more conveniently individually adjusts circulating oil amount.

This invention discloses a distillation apparatus for processing high-QI needle coke feedstock, relating to the field of high-QI needle coke feedstock processing technology. It includes a heating furnace, a vacuum distillation column, and a fractionation column. The heating furnace is connected to the lower end of the vacuum distillation column. The top of the vacuum distillation column is a waste oil discharge end, the middle section is a mid-section oil collection system, and the lower end is a heavy phase pitch collection end. The waste oil discharge end is connected to a top vacuum pump. The mid-section oil collection system is connected to the lower end of the fractionation column. The fractionation column, from top to bottom, consists of a first fraction collection system, a second fraction collection system, and a third fraction collection system. This invention pre-treats needle coke feedstock by combining vacuum distillation and fractionation, significantly increasing the yield of needle coke feedstock.

This invention discloses a method for detecting the liquid level at the bottom of a fractionation column, belonging to the field of air separation. Addressing the problem that traditional single differential pressure measurements under cryogenic conditions are prone to failure due to ice blockage or vaporization of the pressure tapping pipe and cannot be maintained online, this method constructs a heterogeneous redundant measurement system combining contact differential pressure detection and non-contact external ultrasonic detection. By simultaneously acquiring two raw signals, density dynamic compensation and sound velocity compensation based on a thermodynamic database are performed respectively to calculate high-precision first and second liquid level values. Subsequently, an adaptive Kalman filter algorithm is introduced to dynamically adjust process noise based on feed and discharge flow rates and estimate observation noise in real time based on residuals, optimally fusing the two liquid level values. This invention achieves highly reliable fusion of multi-source data and system logic self-healing, significantly improving the accuracy, stability, and intelligence level of fractionation column bottom liquid level measurement.

The utility model provides a fractionating tower top diversion anti-corrosion device which is arranged at the top end of a fractionating tower body and comprises a diversion body and a connector, a liquid collecting tank and a supporting net are arranged in the diversion body, the supporting net is arranged above the liquid collecting tank, the supporting net is composed of a plurality of net layers, ceramic fibers are arranged between the net layers of the supporting net, and the connector is connected with the diversion body. A through hole communicated with the outside is formed in the bottom of the liquid collecting groove and connected with a liquid guide pipe, a drain valve is arranged in the liquid guide pipe, and a plurality of ammonia water injection openings are formed in the portion, above the supporting net, of the flow guide body. Therefore, the device has the advantages of collecting liquid acid condensed at the top of the tower due to low temperature, timely leading out the liquid acid at the top of the tower, preventing the inner wall of the fractionating tower from being corroded, and providing guarantee for the stability of a system in the fractionating tower.

Processes for producing two CO2 streams having different purities, including one stream comprising ultra high purity CO2. The processes incorporate a second fractionation column in a CO2 fractionation process. The bottoms stream from the first cryogenic fractionation column is sent to the second CO2 fractionation column. The second CO2 fractionation column can produce ultra high purity CO2. The bottoms stream from the first column can be divided and a portion of the bottoms stream can be recovered as a second CO2 product stream having a lower purity than the purity of the product stream.

The utility model relates to the technical field of chemical engineering, in particular to a fluidized bed residual oil hydrocracking device fractionating tower coking treatment system which comprises a fractionating tower, an atmospheric tower hot feeding line, a fractionating tower outlet line, an atmospheric wax oil circulation line, a circulation branch line, a diesel oil extraction line and an inlet steam line which are connected to the atmospheric wax oil circulation line, a normal-pressure wax oil collecting tank is arranged in the fractionating tower; a hot feeding line of the atmospheric tower is connected to an inlet of the fractionating tower; one end of the fractionating tower outlet line is connected with an outlet of the fractionating tower, the other end of the fractionating tower outlet line is connected with an inlet of the normal-pressure wax oil stripping tower, a tower inlet valve is arranged on the fractionating tower outlet line, a first bypass pipeline is arranged on the tower inlet valve, and a valve group is arranged on the first bypass pipeline. A normal-pressure wax oil collecting tank of a fractionating tower is forwards or reversely cleaned by introducing a diesel oil extraction line, and the normal-pressure wax oil collecting tank of the fractionating tower can be reversely cleaned by introducing an inlet steam line, so that the problem of coking and blockage of the normal-pressure wax oil collecting tank is solved.

The present disclosure relates to a method and system for cracking wide-cut feedstock containing heavy components to produce olefins. The wide-cut feedstock is mixed with a first portion of steam, then mixed with a second portion of steam, and then introduced into a fractionating column for separation. The light fraction and the middle fraction obtained by fractionation are heated in a convection section and then introduced into different furnace tubes of a radiant section of a steam cracking device for cracking. Alternatively, part of the fraction is sent to a refinery for secondary processing to produce other products. This method can efficiently crack different fractions of light crude oil or condensate oil, has high olefin yield, saves energy, and can maximize the use of existing steam cracking technology, which is mature and easy to operate. The method eliminates the need for atmospheric and vacuum distillation devices, thereby saving investment. The method has a wide range of crude oil adaptability and improves the comprehensive utilization rate of different fractions of wide-cut feedstock.

The utility model belongs to the field of chemical technology, especially relate to a water injection device of light and medium component hydrocracking device. The communication subassembly is used for communicating the fractionating tower. The water injection subassembly includes the purification mechanism and the water injection jar, and the purification mechanism sets up on the water injection jar, and the purification mechanism is used for communicating with the communication subassembly. The purification mechanism includes the purification cylinder, drive structure and activated carbon structure. The installation mouth is set up in the front side of purification cylinder, and the water inlet hole that communicates with the communication subassembly is set up in the back side of purification cylinder, and the lower end of purification cylinder is connected with the upper end of water injection jar and communicates. Drive structure sets up on the purification cylinder. The activated carbon structure is provided with two, and one activated carbon structure is located below the water inlet hole, and the other activated carbon structure corresponds the installation mouth. Through setting up the communication subassembly and the water injection subassembly, can take acidic water as light and medium component hydrocracking device water injection, namely, reduces the energy consumption needed for acidic water stripping, and can reduce the oxygen removal water usage, is favorable for reducing the use cost.

The invention relates to the technical field of aromatic hydrocarbon isomerization, and discloses a xylene aromatic hydrocarbon full liquid phase isomerization method and system, and the method comprises the following steps: (1) carrying out ethylbenzene adsorption separation on an ethylbenzene-containing C8 aromatic hydrocarbon raw material to obtain ethylbenzene and EB-poor xylene aromatic hydrocarbon; (2) carrying out p-xylene adsorption separation on the EB-poor xylene aromatic hydrocarbon to obtain p-xylene and PX-poor xylene aromatic hydrocarbon; (3) carrying out full liquid phase isomerization reaction on the PX-poor xylene aromatic hydrocarbon to obtain a reaction product; (4) conveying a reaction product to a fractionating tower for separation, condensing light components at the top of the tower into a liquid phase through a heat exchanger, reconveying the liquid phase to the top of the tower after decompressing and discharging hydrogen in a reflux tank, and discharging heavy components containing C9 < + > aromatic hydrocarbon from the bottom of the tower; and (5) extracting a hydrogen-poor material from the side line of the fractionating tower, and carrying out p-xylene adsorption separation. EB is separated from the source, the advantages of liquid phase isomerization are fully played, and the purpose of reducing the overall material consumption and energy consumption of the aromatic hydrocarbon process is finally achieved.

The utility model discloses an anti-coking fractionating tower for heavy oil processing. The anti-coking fractionating tower comprises a tower body, a hollow cooling cavity is arranged in the tower wall at the bottom of the tower body, a filter cover is fixedly mounted in the bottom of the tower body, a fixing frame is fixedly connected to one side of the bottom of the tower body, a plurality of supporting blocks are fixedly connected to the fixing frame, and a cooling liquid box is fixedly connected to the top surfaces of the supporting blocks. By arranging the cooling liquid tank, the first pump body, the liquid return pipe, the second pump body, the liquid outlet pipe, the cooling cavity and the like, cooling liquid entering the cooling cavity through the liquid outlet pipe can absorb heat of oil at the bottom of the tower, the temperature of the oil at the bottom of the tower can be reduced, coking can be prevented, and the service life of the tower is prolonged. The cooling liquid which enters the cooling cavity and absorbs heat can enter the cooling liquid box through the liquid return pipe to be cooled and then is discharged through the liquid outlet pipe, and the cooling liquid can be recycled.

This invention relates to the field of air distillation technology, specifically disclosing a method for optimizing the entire air separation process based on DCS collaborative control. This invention utilizes DCS for system self-checking and status reset; optimizes air compression, precooling, and purification control; coordinates the start-up of the circulating compressor and expander to establish a high-pressure air flow path and generate initial cooling capacity; performs adaptive cooling control of the fractionation column and analyzes the cooling endpoint; coordinates the loading of refrigeration capacity and air volume; and, upon determining the initial establishment of distillation conditions, implements closed-loop purity control and automatic product delivery control, along with adaptive collaborative optimization across all operating conditions. Based on DCS, it enables automated analysis and control of the entire process, significantly reducing reliance on manual labor, improving control efficiency, effectively avoiding operational errors, and enabling collaborative control throughout the process, reducing mutual interference during adjustment and control, and preventing large fluctuations in operating conditions.

The utility model relates to the technical field of fractionating tower trays, in particular to an efficient fractionating tower tray for ethyl chloroacetate rectification, which comprises a fixedly arranged upper tower drum, a liquid inlet pipe is mounted on the outer side wall of the left side of the lower part of the upper tower drum, and the tail end of the liquid inlet pipe is horizontally rightward and fixedly connected onto the outer side wall of the upper tower drum in a sealing manner; the interior of the liquid inlet pipe is communicated with an upper cavity of the upper tower drum through a liquid inlet, the outer side wall of the lower portion of the upper tower drum is sealed and movably connected to the outer side wall of the upper portion of the lower tower drum in a sleeving mode, a coaxial fluted disc is integrally formed and fixed to the outer side wall of the upper portion of the lower tower drum, and a gas-liquid mixing assembly is installed in a lower cavity of the lower tower drum. Through the structural design that the upper tower drum is sleeved with the lower tower drum and the lower tower drum can rotate circumferentially, and in combination with the arrangement of the vertical scrapers, the vertical scrapers can rotate along with the lower tower drum to scrape the liquid inlet, so that the materials near the liquid inlet are prevented from being accumulated and blocked, the liquid is ensured to smoothly enter the upper tower drum, and the stability and continuity of the fractionation process are maintained.

The utility model discloses a side extraction hopper for an isooctane reactor, which relates to the field of isooctane fractionating tower middle parts and comprises a fractionating tower middle part and a side extraction hopper arranged on the fractionating tower middle part, a limiting mechanism for limiting the middle part of the fractionating tower and the side extraction hopper is arranged on the side extraction hopper; the limiting mechanism comprises a limiting unit and a transmission unit. By arranging the limiting mechanism, when the side extraction bucket needs to be cleaned, the movable blocks and the push rod can be driven to move outwards by exerting outward pulling force on the pull rod, so that the guide rod on the push rod exerts extrusion pushing force on the guide groove in the limiting block, and meanwhile the other movable block is driven to move through the connecting rod; and the two limiting blocks which are symmetrical up and down are close to each other, so that the limitation of the middle part of the side extraction bucket fish fractionating tower is relieved, and a filter screen on the side extraction bucket is conveniently and quickly cleaned.

The invention provides a control method, device and equipment for a partition plate type side-mining coarse separation tower and a medium. The method comprises the steps that the real-time feeding amount of the coarse separation tower and the real-time temperature of a target detection point are obtained; feedforward control is carried out on the steam flow of the coarse separation tower according to the real-time feeding amount so as to reduce the fluctuation of the upper temperature of the side mining tower, and the feedforward control is a control mode of adjusting the steam flow in advance according to the change of the feeding amount; according to the real-time temperature of the left lower temperature detection point and a corresponding first target control value, the small backflow flow is adjusted based on left lower temperature-small backflow cascade control, so that the temperature fluctuation of the left lower temperature detection point is reduced; and according to the real-time temperature of the tower top temperature detection point, the large reflux flow is subjected to compensatory adjustment, so that the temperature fluctuation of the tower top temperature detection point is reduced. The control precision of the partition plate type side-mining rough separation tower can be improved.

The application discloses a kind of stable column oil-gas separation control method, device, equipment and medium, belong to oil refining chemical industry field, control method includes: obtaining the product information of stable column;According to product information, it is judged whether product quality is qualified;If product quality is unqualified, then light gasoline is discharged from the intermediate material outlet of stable column;After light gasoline is discharged, control stable column carries out oil-gas separation processing, and obtains qualified liquefied gas and stable gasoline.The application increases the intermediate material outlet in the stable column, and the product is qualified without being used.If it cannot realize the qualification of liquefied gas and stable gasoline by appropriately increasing reflux ratio, the intermediate material outlet is used, and the light gasoline material is self-pressured to the main fractionating column top liquid separator or the fresh raw material buffer tank of catalytic cracking device, which reduces the difficulty of realizing the qualification of liquefied gas and stable gasoline, avoids the substantial benefit loss caused by the shutdown of catalytic cracking device, and ensures the long-period operation of stable column.

The invention relates to a method and a system for preparing light aromatic hydrocarbon and an ethylene material through hydrogenation of low-sulfur catalytic diesel oil. A low-sulfur catalytic diesel oil raw material is subjected to impurity removal through a filter, and sequentially passes through a hydrofining reaction system and a hydrocracking reaction system; the reaction product is subjected to one-step separation to obtain recycle hydrogen and a liquid-phase product, and after the liquid-phase product passes through a fractionating tower, gas-phase light hydrocarbon is sent to an alkaline tower of an ethylene unit for desulfurization. Hydrogenation reaction heat is utilized in a stepped and segmented mode, and medium-pressure steam is generated through a steam generator; and the reaction material subjected to heat exchange by the steam generator is subjected to heat exchange to preheat the raw material. The method can be used for treating low-sulfur catalytic diesel oil, the reaction efficiency is high, the separation effect is good, and the yield of chemical products is increased; the method provided by the invention has the advantages of high efficiency, energy conservation, high conversion activity, high product yield and improvement of the added value of the product.

The application provides a coal direct liquefaction oil hydrogenation treatment system, which comprises a feeding unit, a reactor and a separation unit; the feeding unit is used for conveying coal direct liquefaction oil and hydrogen; the feeding unit is communicated with a feeding port of the reactor, and the coal direct liquefaction oil and the hydrogen enter the reactor to perform a hydrogenation reaction; the separation unit comprises a hot high-pressure separator, a cold high-pressure separator, a filtering separation device, a hot high-oil tank and a fractionating column; the hot high-pressure separator is connected with an outlet of the reactor; the filtering separation device is used for separating hot high-oil liquid phase into hot high-oil liquid and hot high-oil slurry; the hot high-oil liquid enters the hot high-oil tank, and the hot high-oil slurry enters the reactor; the hot high-oil tank and the cold high-pressure separator are connected with the fractionating column. By using the scheme, the problems that solid particles in the coal direct liquefaction oil easily cause abrasion, blockage of valves, pumps and the like in the conveying process of liquefaction circulating solvents and liquefaction oil products, and reduction of the yield and purity of the liquefaction oil products are solved.

One aim of the present invention is to enable the size of the fractionation column located downstream of the hydrocracking section to be minimised and therefore to minimise the cost of the process without having an impact on the performance of the process in terms of yield and selectivity for kerosene produced, by virtue of implementing a step of separation at the outlet of the hydrotreatment step a) and at the outlet of the hydrocracking step c), in the same separation unit or in different units, enabling at least part, and preferably all, of the liquid hydrocarbon effluent resulting from said separation to be fed directly to the hydrocracking step c) without passing through the fractionation step.

A system and method for removing nitrogen from natural gas using two fractionating columns, that may be stacked, and a plurality of separators and heat exchangers, with horsepower requirements that are 50-80% of requirements for prior art systems. The fractionating columns operate at different pressures. A feed stream is separated with a vapor portion feeding the first column to produce a first column bottoms stream that is split into multiple portions at different pressures and first column overhead stream that is split or separated into two portions at least one of which is subcooled prior to feeding the top of the second column. Optional heat exchange between first column and second column streams provides first column reflux and reboil heat for a second column ascending vapor stream. Three sales gas streams are produced, each at a different pressure.