CN110937968A - Device and process for producing aromatic hydrocarbon product - Google Patents
Device and process for producing aromatic hydrocarbon product Download PDFInfo
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- CN110937968A CN110937968A CN201811113906.9A CN201811113906A CN110937968A CN 110937968 A CN110937968 A CN 110937968A CN 201811113906 A CN201811113906 A CN 201811113906A CN 110937968 A CN110937968 A CN 110937968A
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/005—Processes comprising at least two steps in series
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C5/00—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms
- C07C5/22—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by isomerisation
- C07C5/27—Rearrangement of carbon atoms in the hydrocarbon skeleton
- C07C5/2729—Changing the branching point of an open chain or the point of substitution on a ring
- C07C5/2732—Catalytic processes
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/04—Purification; Separation; Use of additives by distillation
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/12—Purification; Separation; Use of additives by adsorption, i.e. purification or separation of hydrocarbons with the aid of solids, e.g. with ion-exchangers
- C07C7/13—Purification; Separation; Use of additives by adsorption, i.e. purification or separation of hydrocarbons with the aid of solids, e.g. with ion-exchangers by molecular-sieve technique
Abstract
The invention discloses a device and a process for producing aromatic hydrocarbon products. The invention relates to a device for producing aromatic hydrocarbon products, which comprises a xylene fractionation unit, an adsorption separation unit and an isomerization reaction unit; the adsorption separation unit comprises an adsorption separation tower, an extract liquid fractionating tower, a raffinate tower and a heat exchanger II; the isomerization reaction unit comprises an isomerization reaction rectifying tower, a clay tower, an isomerization reaction heating furnace, a heat exchanger III, a heat exchanger IV, a heat exchanger VI and a compressor. The invention also provides a process for producing the aromatic hydrocarbon product. The invention reduces the equipment investment, reduces the operation load of the xylene tower, saves the fuel gas consumption of the xylene reboiling furnace, simultaneously carries out the isomerization reaction and the separation of the product, and realizes the coupling utilization of energy; the heat exchange network is optimized, the consumption of fuel gas of the isomerization reaction heating furnace is reduced, the energy consumption is greatly reduced, and the economic benefit and the social benefit are improved.
Description
Technical Field
The invention relates to a device and a process for producing aromatic hydrocarbon products.
Background
Paraxylene is one of important basic organic raw materials in petrochemical industry, is mainly used for Preparing Terephthalic Acid (PTA) and dimethyl terephthalate (DMT), and is widely applied to the production fields of chemical fibers, synthetic resins, pesticides, medicines, plastics and the like. The apparent consumption of p-xylene in 2017 will reach 2400 x 104t, the productivity of the p-xylene device reaches 816 multiplied by 104t, the production capacity of the whole world is about 20 percent, and China is the biggest paraxylene producing country in the world.
C8Aromatic hydrocarbons include the four isomers of ortho-, para-, meta-and ethylbenzene, with para-xylene being the largest in the marketplace, and so it is generally more desirable in the industry to enhance the conversion of the aromatic hydrocarbon to the specified C8The aromatic feedstock source even maximizes the production of para-xylene. Because of their similar chemical structure and physical properties and identical molecular weight, para-xylene depleted C is generally obtained by isomerization reactions8Conversion of aromatics to equilibrium concentration C8Aromatic hydrocarbon mixture is rectified, adsorbed and separated to obtain high purity p-xylene product and low p-xylene C8The aromatic hydrocarbon is circulated in the system to carry out isomerization reaction again.
The separation of paraxylene is generally carried out industrially by crystallization and adsorption separation, among which adsorption separation is used in many cases. The raw material for adsorption separation is mixed C8Aromatic hydrocarbons, using para-C8The selectivity of four isomers of aromatic hydrocarbon is different, para-xylene is preferentially adsorbed, and then the para-xylene on the adsorbent is desorbed by a desorbent. The extract is a material rich in p-xylene, and a high-purity p-xylene product is obtained by rectification; the raffinate is a material poor in p-xylene, and after a desorbent is separated out by a raffinate tower, the C with the equilibrium concentration is obtained through isomerization reaction8The aromatic mixture is then recycled back to the xylene for fractionation. In the process, the pumpThe effluent is rectified into a double-tower flow of an extract tower and a finished product tower, the energy consumption is large, and C is removed from an isomerized product by a deheptanizer7After the light hydrocarbon is discharged, most of the light hydrocarbon is circulated back to the xylene tower, so that the operation load of the xylene tower is increased, and the fuel consumption of the xylene reboiling furnace is increased. In addition, the isomerization product must be cooled completely, and after hydrogen which does not participate in the reaction is separated, the cooling load is large; the material after the hydrogen is separated needs to be heated again and enters a deheptanizer for further separation, and the material has the problem of being cooled firstly and then heated, thus causing energy waste.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a device and a process for producing an aromatic hydrocarbon product. The invention modulates the trend of material flow in the process by arranging the clapboard type reaction rectifying tower, further optimizes a heat exchange network, reduces the operation load of the xylene tower, saves the fuel gas consumption of the xylene reboiling furnace, simultaneously separates the isomerization reaction and the product, realizes the coupling utilization of energy, reduces the fuel gas consumption of the isomerization reaction heating furnace, greatly reduces the energy consumption, and improves the economic benefit and the social benefit.
The device for producing the aromatic hydrocarbon product comprises a xylene fractionation unit, an adsorption separation unit and an isomerization reaction unit.
The xylene fractionation unit comprises a xylene tower, a heat exchanger I and a xylene reboiling furnace.
The xylene column is used for separating C8Component (A) and (C)9 +The component is generally a plate-type rectifying tower.
The heat exchanger I is used for taking the xylene overhead material flow as a heat source of a reboiler of a raffinate tower and a reboiler of a draw liquid fractionating tower, one part of condensed liquid after heat exchange is taken as reflux and returned to the xylene tower, and the other part of condensed liquid is taken as adsorption separation feeding.
The xylene reboiling furnace is used for heating materials which are recycled to the bottom of the tower, and provides reboiling heat for the xylene tower.
The xylene fractionation unit further comprises a unit for fractionating C8Feeding aromatic mixture feedstock to xylene columnA feed line; a pipeline for sending the tower top discharge to a heat exchanger I; circulating a part of the discharged material at the top of the tower after heat exchange by the heat exchanger I back to a pipeline of the xylene tower; the other part of the tower top discharge after heat exchange by the heat exchanger I is sent to a pipeline of the adsorption separation unit; a feed line for feeding a portion of the bottoms to a bottom reboiling furnace; a line for recycling the bottom material heated by the bottom reboiling furnace to the xylene column; the other part of the tower bottom material is discharged out of a pipeline of the xylene tower; wherein the top discharge of the tower is C8Aromatic hydrocarbon, the material at the bottom of the tower is C9 +An aromatic hydrocarbon.
The adsorption separation unit comprises an adsorption separation tower, an extract liquid fractionating tower, a raffinate tower and a heat exchanger II.
The adsorption separation tower is used for separating paraxylene and isomers thereof in materials from a xylene fractionation unit to obtain a paraxylene-rich extract and a paraxylene-poor raffinate.
The extract fractionating tower is used for separating toluene, paraxylene and desorbent in the extract rich in paraxylene to obtain a high-purity paraxylene product. The extract fractionating tower adopts a dividing wall tower, a vertical clapboard is generally arranged in the middle of the traditional rectifying tower, and the rectifying tower is divided into four parts, namely an upper public rectifying section, a lower public stripping section, a rectifying feeding section and a side line extracting section which are separated by the clapboard. The material at the bottom of the tower is a desorbent, the material at the top of the tower is toluene, and the material at the side line is a paraxylene product.
The raffinate tower is used for separating C in the p-xylene-poor raffinate8The components and the desorbent are discharged from the upper side line of the raffinate tower as the lean p-xylene C8The components, the discharge from the bottom of the tower is the desorbent.
The heat exchanger II is used for exchanging heat between a desorbent and an isomerization feed, improving the temperature of the isomerization feed and reducing the load of an isomerization reaction heating furnace; and simultaneously reducing the temperature of the desorbent to the proper temperature of the desorbent returning to the adsorption separation tower.
The adsorption separation unit also comprises a pipeline for feeding the tower top discharge of the xylene fractionation unit after heat exchange to an adsorption separation tower, a pipeline for delivering the separated p-xylene-rich extract to an extract fractionation tower, and a pipeline for delivering the p-xylene-poor raffinate obtained by adsorption separation of the adsorption separation tower to a raffinate tower; a pipeline for discharging the materials at the top of the extract fractionating tower and a pipeline for discharging the materials at the side line of the extract fractionating tower; the method comprises the following steps of (1) sending an extract fractionating tower bottom material to a pipeline of a heat exchanger II, sending a raffinate tower bottom material (desorbent) to a pipeline of the heat exchanger II, and sending the extract fractionating tower bottom material and the raffinate tower bottom material subjected to heat exchange to a pipeline of an adsorption separation tower; and (3) feeding the side line discharge at the upper part of the raffinate tower to a pipeline of an isomerization reaction unit after heat exchange of a heat exchanger II.
The isomerization reaction unit comprises an isomerization reaction rectifying tower, a clay tower, an isomerization reaction heating furnace, a heat exchanger III, a heat exchanger IV, a heat exchanger VI and a compressor.
The isomerization reaction rectifying tower adopts a partition plate type reaction rectifying tower form, one side of the partition plate is provided with an isomerization reaction zone, an isomerization catalyst is filled in the reaction zone, and the isomerization reaction rectifying tower is used for absorbing the p-xylene lean C from the adsorption separation unit8The component is converted into the paraxylene-rich C by isomerization reaction8The components are simultaneously separated from the reaction product, and the material at the top of the tower is rectified to be C7Light hydrocarbon and hydrogen, the material at the bottom of the tower is C9 +Aromatic hydrocarbon component, side stream material is C8An aromatic hydrocarbon. The baffle type reactive distillation tower is generally characterized in that a vertical baffle is arranged in the middle of the traditional distillation tower, and the distillation tower is divided into an upper public distillation section, a lower public stripping section, a distillation feeding section and a side line extraction section which are separated by the baffle.
The isomerization reaction zone can be arranged on one side of the partition plate, and the filling amount of the catalyst is determined by the space velocity of the isomerization reaction. The location of the isomerization reaction zone is determined by the reaction temperature and the operating conditions of the isomerization rectifying column.
In the isomerization unit, hydrogen is preferably from the reforming unit. The proper hydrogen to hydrocarbon ratio is beneficial to maintaining the activity and stability of the isomerization catalyst. The hydrogen can be recycled and can also be supplemented with new hydrogen. With the progress of isomerization reaction, the purity of the circulating hydrogen is gradually reduced, so that a part of low-purity hydrogen-containing gas needs to be discharged, and meanwhile, high-purity hydrogen is supplemented to maintain the purity of the circulating hydrogen. The clay tower is used for removing a small amount of unsaturated hydrocarbons such as olefin and carbonyl in the side line material of the isomerization reaction rectifying tower.
The isomerization heating furnace is used for controlling the isomerization feeding temperature.
The heat exchanger III is used for exchanging heat between the side line material of the isomerization reaction rectifying tower as the clay tower feeding material and the isomerization feeding material, improving the isomerization feeding temperature and reducing the clay tower feeding temperature to the proper temperature.
The heat exchanger IV is used for feeding the adsorption separation tower and the isomerization reaction, improving the isomerization feeding temperature and reducing the feeding temperature of the adsorption separation tower to a proper temperature.
The heat exchanger VI is used for exchanging heat between the tower bottom material of the isomerization reaction rectifying tower and the clay tower discharging material, and improving the clay tower discharging temperature; the clay tower discharging after heat exchange is the feeding of the adsorption separation tower.
The compressor is used for pressurizing hydrogen and/or circulating hydrogen entering the isomerization reaction rectifying tower.
The isomerization reaction unit also comprises a feeding pipeline for feeding the isomerization reaction to an isomerization reaction zone of the isomerization reaction rectifying tower, and the feeding pipeline is sequentially connected with a heat exchanger III, a heat exchanger IV and an isomerization reaction heating furnace before being connected with the isomerization reaction rectifying tower; the material C at the top of the isomerization reaction rectifying tower7A discharge line for discharging the light hydrocarbon and hydrogen; feeding the side-line material of the isomerization reaction rectifying tower into a feeding pipeline of the clay tower, wherein the feeding pipeline is connected with a heat exchanger III in front of the clay tower; connecting a discharging pipeline at the bottom of the carclazyte tower with a heat exchanger VI, and connecting a pipeline after heat exchange with an adsorption separation feeding pipeline; and a discharge pipeline for discharging the bottom product of the isomerization reaction rectifying tower is connected with a heat exchanger VI before discharging.
The isomerization reaction unit is preferably provided with a gas-liquid separation tank, an air cooler and a heat exchanger V; the gas-liquid separation tank is used for separating the material C at the top of the isomerization reaction rectifying tower7Hydrogen, etc. in the following light hydrocarbons, gas phaseDischarging part of the mixture outside, pressurizing, exchanging heat and/or heating the other part of the mixture, and returning the other part of the mixture to the isomerization reaction rectifying tower; the liquid phase is subjected to heat exchange and then is taken out of the device as a light hydrocarbon product; the heat exchanger V is used for liquid-phase light hydrocarbon products of the gas-liquid separation tank and materials (C) at the top of the isomerization reaction rectifying tower7The following light hydrocarbons and hydrogen) heat exchange; the air cooler is used for further reducing the overhead material (C) of the isomerization reaction rectifying tower7The following light hydrocarbons and hydrogen); the device also comprises a feeding pipeline for feeding the material at the top of the isomerization reaction rectifying tower into the gas-liquid separation tank, wherein the feeding pipeline is sequentially connected with a heat exchanger V and an air cooler before being connected with the gas-liquid separation tank; a discharge pipeline for discharging at least a part of the gas phase separated by the gas-liquid separation tank outwards, and a pipeline for recycling the rest of the gas phase to the isomerization reaction rectifying tower; and a discharge line for discharging the liquid phase separated in the gas-liquid separation tank.
The invention also provides a process for producing the aromatic hydrocarbon product, which comprises the following steps: containing C8The aromatic hydrocarbon mixture raw material enters a xylene tower for fractionation, after heat exchange is carried out on the tower top material by a heat exchanger I, one part of the tower top material is returned to the xylene tower as reflux, the other part of the tower top material is used as adsorption separation feeding material, and after heat exchange is carried out on the tower top material and isomerization reaction feeding material by a heat exchanger IV, the tower top material is sent to an adsorption separation tower; the bottom material of the tower returns to the xylene tower after passing through the xylene reboiling furnace and being heated, and the other part of the bottom material of the tower is C9 +Aromatic hydrocarbons; the adsorption separation feeding is subjected to adsorption separation by an adsorption separation tower, the obtained p-xylene-rich extract enters an extract fractionating tower for fractionation, the tower bottom material is a desorbent, and after being mixed with the raffinate tower bottom material, the desorbent exchanges heat with the isomerization reaction feeding by a heat exchanger II and returns to the adsorption separation tower; toluene is taken as a material at the top of the extract fractionating tower, and paraxylene is taken as a material at the side line; the low-p-xylene raffinate obtained by the adsorption separation of the adsorption separation tower enters a raffinate tower for fractionation, the materials on the upper side line sequentially flow through a heat exchanger II, a heat exchanger III and a heat exchanger IV to exchange heat with a desorbent, a carclazyte tower feed and an adsorption separation feed respectively, then enter an isomerization reaction zone of an isomerization reaction rectifying tower for isomerization reaction after being heated by an isomerization reaction heating furnace, and simultaneously, reaction products are separated, wherein the material on the top of the tower is C7Light weight ofThe side stream material is subjected to heat exchange by a heat exchanger III, enters a clay tower to remove unsaturated hydrocarbons such as olefin and the like, and is used as adsorption separation feeding, the tower bottom discharging material is subjected to heat exchange with the adsorption separation feeding by a heat exchanger VI, and the heat exchanged material is used as C9 +And (5) discharging aromatic hydrocarbon.
In the process, the material at the top of the isomerization reaction rectifying tower is preferably subjected to heat exchange by a heat exchanger V, cooled by an isomerization reaction product air cooler, enters a gas-liquid separation tank and is separated into a gas-liquid two phase; the gas phase is discharged from the top of the gas-liquid separation tank and divided into two parts: one strand is discharged outside; the other strand is mixed with hydrogen, pressurized by a compressor and mixed with an isomerization reaction feed; the liquid phase material obtained by the separation of the gas-liquid separation tank is used as C after heat exchange of the heat exchanger V7The following light hydrocarbons.
The isomerization reaction rectifying tower is in a partition type reaction rectifying tower form, a vertical partition is generally arranged in the middle of a traditional rectifying tower, and the rectifying tower is divided into an upper public rectifying section, a lower public stripping section, a rectifying feeding section and a side line extracting section which are separated by the partition. One side of the partition board is provided with an isomerization reaction zone, and the isomerization reaction and the separation of reaction products are realized in one tower.
Said C containing8The aromatic hydrocarbon raw material mainly comprises mixed hydrocarbon containing ethylbenzene, paraxylene, ortho-xylene and meta-xylene, and also comprises C7Light hydrocarbons and C9The above heavy hydrocarbons. Wherein C is7The light hydrocarbon below is an aromatic hydrocarbon, an alkane or a cycloalkane having 7 or less carbon atoms, C9The heavy hydrocarbon refers to a hydrocarbon having 9 or more carbon atoms, such as an aromatic hydrocarbon, an alkane, or a cycloalkane.
The top pressure of the xylene tower is 0.3-2.5 MPa, preferably 0.5-1.8 MPa, and the temperature of the top of the xylene tower is 50-300 ℃, preferably 110-280 ℃. The xylene tower is preferably a plate tower, and the number of plates is 150-200.
The operating conditions of the adsorption separation unit are as follows: the temperature is 100 to 300 ℃, preferably 150 to 200 ℃, and the pressure is 0.2 to 1.5MPa, preferably 0.6 to 1.0 MPa.
In the adsorption separation unit, the adsorption separation tower adopts a fixed bed and is communicated with a reaction tankThe material inlet and outlet positions of the fixed bed adsorption equipment are changed, so that the effect that the adsorbent continuously moves downwards and the material continuously moves upwards is achieved. The bed is filled with an adsorbent with high selectivity to p-xylene. The active component of the adsorbent is X-type zeolite or Y-type molecular sieve of Ba or BaK, and the binder is selected from kaolin, silicon dioxide or alumina. The desorbent is mutually soluble with each component in the raw material and is also mutually soluble with C8The boiling points of the components in the aromatic hydrocarbon have larger difference, and the components are easy to recycle, preferably p-diethylbenzene or toluene.
The operation conditions of the extract fractionating tower are as follows: the pressure at the top of the tower is 0.1-0.5 MPa, the operation at normal pressure is preferred, and the temperature at the top of the tower is 50-200 ℃, and the temperature is preferably 100-150 ℃.
The operation conditions of the raffinate tower are as follows: the pressure at the top of the tower is 0.1-1.0 MPa, the operation at normal pressure is preferred, and the temperature at the top of the tower is 120-170 ℃.
The isomerization rectifying tower has the tower top pressure of 0.2-2.5 MPa, preferably 0.5-1.8 MPa, and the tower top temperature of 150-300 ℃, preferably 170-220 ℃; the catalyst loading is determined by the isomerization mass airspeed, and the mass airspeed is 2-10 h-1And the molar ratio of the hydrogen to the reaction feed is 2-8.
The isomerization reaction conditions are as follows: the reaction temperature is 300-450 ℃, the preferable temperature is 330-400 ℃, the pressure is 0.1-2.0 MPa, the preferable pressure is 0.4-1.5 MPa, and the mass space velocity is 2-10 h-1Preferably 3 to 6 hours-1The molar ratio of the reaction hydrogen to the hydrocarbon is 2 to 8, preferably 3 to 6.
The isomerization reaction rectifying tower is filled with an isomerization catalyst, and the isomerization catalyst is an active component loaded with one or more of Pt, Sn, Mg, Bi, Pb, Pd, Re, Mo, W, V and rare earth metals on a molecular sieve and/or an inorganic oxide carrier. The molecular sieve is one or a mixture of more of five-membered ring molecular sieve, mordenite, EUO type molecular sieve and MFI molecular sieve. The inorganic oxide is alumina and/or silica.
The operating conditions of the gas-liquid separation tank are as follows: the operation temperature is 35-40 ℃, and the pressure is 0.5-1.1 MPa.
Compared with the prior art, the invention has the following beneficial effects:
(1) the extraction liquid fractionating tower with a dividing wall tower structure is arranged in the adsorption separation unit, and an extraction liquid tower and a finished product tower in the conventional process are omitted, so that the back mixing degree of p-xylene in the separated components is reduced, the thermodynamic efficiency of separation is improved, and meanwhile, the phenomenon that the extraction liquid tower cools the toluene and the p-xylene components in the conventional process, and the heat entering the finished product tower for separation is unreasonably utilized after being heated is avoided; in the conventional process, reboiling loads of an extract tower and a finished product tower are respectively provided by materials at the top and the bottom of a dimethylbenzene tower and a desorbent, the extract fractionating tower with a dividing wall tower structure is arranged, the reboiling loads can be completely provided by the materials at the top of the dimethylbenzene tower, the heat of the materials at the top of the dimethylbenzene tower is fully recovered, and the use of the heat of the materials at the bottom of the dimethylbenzene tower is reduced, so that the fuel gas consumption of a reboiling furnace of the dimethylbenzene tower is saved, meanwhile, the top of the extract fractionating tower only needs to cool methylbenzene and part of p-; desorbent materials at the bottoms of the extract fractionating tower and the raffinate tower are not used as heat sources of a reboiler of a finished product tower, but used for preheating isomerization reaction feeding, so that the temperature of the reaction feeding into an isomerization heating furnace is increased, and the fuel gas consumption of the isomerization heating furnace is reduced;
(2) in the device and the process, the inventor does not need a deheptanizer and an isomerization reactor in the conventional process by arranging a partition plate type isomerization reaction rectifying tower, not only utilizes the reaction heat of the isomerization reaction, but also skillfully separates the isomerization reaction product in advance through an isomerization fractionating tower, and separates the tower bottom C in the isomerization reaction product9 +Aromatics and overhead C7The lower light hydrocarbon is separated out from the device in advance, and the side stream material is C8Aromatic hydrocarbons are directly mixed with the adsorptive separation feed, whereas in the conventional process, the C is not treated in the deheptanizer9 +The aromatic hydrocarbon is separated, so that the operation load of the clay tower is increased, and the material passing through the clay tower needs to enter the xylene tower again, so that the operation load of the xylene is greatly increasedThe boiling load reduces the equipment investment and the occupied area, reduces the back mixing of materials and improves the thermodynamic efficiency of separation; in the invention, the material C at the top of the isomerization reaction rectifying tower7The following light hydrocarbons can be directly discharged from the device without arranging a condensing system and gas-liquid separation equipment; or gas-liquid separation and then discharge. The isomerization reaction product of the conventional process needs to be cooled by an air cooler and a water cooler, gas-phase components such as hydrogen and the like are separated out by a gas-liquid separation tank, the liquid-phase components are reheated, and C is separated out by a deheptanizer7 -Light component, C8 +Returning the components to the xylene tower for further separation to obtain C8The cooling load is large in the process, and after gas-phase components such as hydrogen and the like are separated, the liquid-phase components are reheated; the invention solves the problem of unreasonable energy utilization of the conventional process of cooling before heating, and greatly reduces the cooling load. In the conventional process flow, the temperature of an isomerization reaction feed of an isomerization reaction unit entering an isomerization reaction heating furnace is about 280-300 ℃; the isomerization reaction unit of the invention cancels the deheptanizer, and simultaneously, through optimizing the heat exchange network, the isomerization reaction feeding does not undergo the process of cooling first and then heating, namely, the heat of the isomerization reaction feeding (the side line material at the upper part of the raffinate tower) is prevented from heating the cooled deheptanizer feeding, the cold and hot material flows are reasonably matched, the temperature of the isomerization reaction feeding in front of the furnace is increased to 300-310 ℃, thereby reducing the fuel gas consumption of the isomerization reaction heating furnace, greatly reducing the energy consumption and improving the economic benefit and the social benefit.
Drawings
Fig. 1, 2 and 3 (fig. 4) are schematic flow diagrams of a xylene fractionation unit, an adsorption separation unit and an isomerization reaction unit (an isomerization reaction unit including a gas-liquid separation flow) of the xylene plant of the present invention, respectively.
Wherein, fig. 1 is a xylene fractionation unit, which comprises a xylene column 101, a heat exchanger I102 and a xylene reboiling furnace 103; FIG. 2 is an adsorptive separation unit comprising an adsorptive separation column 201, an extract fractionation column 202, a raffinate column 203, and a heat exchanger II 204; fig. 3 is an isomerization reaction unit, and fig. 4 is an isomerization reaction unit including a gas-liquid separation process, and includes an isomerization reaction rectifying tower 301, an isomerization reaction heating furnace 302, a clay tower 303, a gas-liquid separation tank 304, an air cooler 305, a compressor 306, a heat exchanger III307, a heat exchanger IV308, a heat exchanger V309, and a heat exchanger VI 310.
Fig. 5, 6 and 7 are schematic flow diagrams of a xylene fractionation unit, an adsorption separation unit and an isomerization reaction unit, respectively, of a conventional xylene plant.
Wherein, fig. 5 is a xylene fractionation unit, which comprises a xylene column 401, a heat exchanger I402 and a xylene reboiling furnace 403; FIG. 6 shows an adsorption separation unit comprising an adsorption separation column 501, an extract column 502, a raffinate column 503, a finished product column 504, a finished product reboiler I505, and a finished product reboiler II 506; fig. 7 is an isomerization reaction unit, which includes an isomerization reactor 601, a deheptanizer 602, a clay column 603, a gas-liquid separation tank 604, an isomerization reaction heating furnace 605, a heat exchanger III606, a heat exchanger IV607, a heat exchanger V608, a heat exchanger VI609, a compressor 610, an air cooler 611, and a water cooler 612.
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
Detailed Description
The paraxylene production process of the present invention will be described in more detail below with reference to the accompanying drawings.
The xylene fractionation unit comprises8The aromatic hydrocarbon mixture raw material 104 is fed to a feed line 107 of the xylene column; line 108 feeding the overhead discharge to heat exchanger I102; a pipeline 109 for circulating a part of the discharged material at the top of the tower after heat exchange by the heat exchanger I102 back to the xylene tower; the other part of the overhead discharge 105 after heat exchange in the heat exchanger I102 is sent to a pipeline 110 of a heat exchanger IV 307; a feed line 112 for feeding a portion of the bottoms 111 to the bottom reboiling furnace 103; a line 113 for recycling the bottom material heated by the bottom reboiler 103 to the xylene column; a line 114 for withdrawing another portion of the bottoms 106 from the xylene column; wherein the overhead output 105 is C8Aromatic hydrocarbons, bottoms 106 being C9 +Aromatic hydrocarbons;
the adsorption separation unit comprises a pipeline 209 for feeding the overhead discharge 205 of the xylene fractionation unit after heat exchange into an adsorption separation tower, a pipeline 210 for sending the p-xylene-rich extract separated from the adsorption separation tower 201 to an extract fractionation tower 202, and a pipeline 214 for sending the p-xylene-poor raffinate obtained by adsorption separation in the adsorption separation tower 201 to a raffinate column 203; a line 211 for withdrawing overhead 206 from the extract fractionator 202, and a line 212 for withdrawing side 207 from the extract fractionator 202; the material at the bottom of the extract fractionating tower 202 is sent to a pipeline 213 of a heat exchanger II204, the material at the bottom of the raffinate tower (desorbent) is sent to a pipeline 217 of the heat exchanger II204, and the material at the bottom of the extract fractionating tower 202 and the material at the bottom of the raffinate tower after heat exchange are sent to a pipeline 218 of the adsorption separation tower 201; the upper side draw 215 of the raffinate column 203 is heat exchanged in exchanger II204 and fed 208 to line 216 of the isomerization unit.
The isomerization reaction unit comprises a feed line 317 for feeding isomerization reaction feed 208 to the isomerization reaction rectifying tower 301, wherein the feed line 216 is sequentially connected with a heat exchanger III307, a heat exchanger IV308 and an isomerization reaction heating furnace 302 through lines 315, 316 and 317 before being connected with the isomerization reaction rectifying tower 301; the overhead 334 of the rectification column 301 exits the unit directly via line 318 and the hydrogen 314 required for the isomerization reaction passes via line 324 to compressor 306 and then to feed line 325 to feed line 316 of the rectification column 301. Feeding the side line material of the isomerization reaction rectifying tower 301 into a feeding pipeline 329 of the clay tower 303, connecting a feeding pipeline 328 to the front of the clay tower 303 and a heat exchanger III307, and connecting the pipeline 329 to the clay tower 303 after heat exchange; a discharge pipeline 330 at the bottom of the clay tower 303 is connected with a heat exchanger VI310, and a pipeline 331 after heat exchange is connected with an adsorption separation feed pipeline 110; the bottom product of the isomerization reaction rectifying tower 301 is discharged through pipelines 332 and 333, and a heat exchanger VI310 is arranged between the pipelines 332 and 333;
in addition, the isomerization reaction unit including the gas-liquid separation process further includes a feed line 320 for feeding the material at the top of the isomerization reaction rectifying tower 301 to the gas-liquid separation tank 304, and before the feed line 318 is connected to the gas-liquid separation tank 304, lines 319 and 320 are connected to the heat exchanger V309 and the air cooler 305 in sequence; a discharge line 322 for discharging at least a part of the gas phase separated in the gas-liquid separation tank 304 to the outside 313, and a feed line 325 for feeding the remaining part to the feed line 316 of the isomerization-reaction rectifying column 301; a line 324 connecting a feed line 323 of hydrogen 314 to compressor 306; the liquid phase separated in the gas-liquid separation tank 304 is connected to a line 326 of the heat exchanger V309, and a line 327 of the post-heat-exchange liquid phase 312 is discharged.
The process flow of the invention is as follows: containing C8The aromatic hydrocarbon mixture raw material 104 enters a xylene column 101 for fractionation, after heat exchange is carried out on a tower top material flowing through a heat exchanger I102, one part of the tower top material returns to the xylene column 101 as reflux, the other part of the tower top material serves as adsorption separation feed 105, and then the tower top material is sent to an adsorption separation column 201 after heat exchange with isomerization reaction feed through a heat exchanger IV 308; the bottom material of the tower returns to the xylene tower 101 after passing through the xylene reboiling furnace 103 and the temperature is raised, and the other part of the bottom material 106 is C9 +An aromatic hydrocarbon.
The adsorption separation feed 205 is subjected to adsorption separation by an adsorption separation tower 201, the obtained paraxylene-rich extract enters an extract fractionating tower 202 for fractionation, a tower bottom material is a desorbent, and after being mixed with a tower bottom material of a raffinate tower 203, the desorbent exchanges heat with the isomerization reaction feed by a heat exchanger II204 and returns to the adsorption separation tower 201; the material at the top of the extract fractionating tower 202 is toluene 206; the side stream material is p-xylene 207; the poor para-xylene raffinate obtained by adsorption separation in the adsorption separation tower 201 enters a raffinate tower 203 for fractionation, and the upper side line material passes through a heat exchanger II204, a heat exchanger III307 and a heat exchanger IV308 in sequence to exchange heat with a desorbent, a clay tower feed and an adsorption separation feed respectively; the hydrogen 314 is pressurized by the compressor 306, mixed with the isomerization reaction material 208, heated by the isomerization heating furnace 302, and then enters the isomerization rectifying tower 301 for isomerization reaction and product separation; the overhead 334 of the rectification column 301 directly leaves the apparatus, and the hydrogen 314 required for the isomerization reaction is mixed with the isomerization feed 208 after being pressurized by the compressor 306. The side line material of the isomerization reaction rectifying tower 301 exchanges heat through a heat exchanger III307, enters a clay tower 303 to remove unsaturated hydrocarbons such as olefin and the like, and the material discharged from the clay tower 303 exchanges heat with the material at the bottom of the isomerization reaction rectifying tower 301 and then exchanges heat with the material at the bottom of the isomerization reaction rectifying tower 301The adsorptive separation feed 105 is mixed. The material at the bottom of the isomerization reaction rectifying tower 301 exchanges heat with the clay tower discharge through a heat exchanger VI310, and the material 311 after heat exchange is taken as C9 +And (5) discharging aromatic hydrocarbon.
In addition, the material at the top of the isomerization reaction rectifying tower 301 can be subjected to heat exchange by a heat exchanger V309, then is cooled by an isomerization reaction product air cooler 305, enters a gas-liquid separation tank 304 and is separated into a gas-liquid two phase; the gas phase is discharged from the top of the gas-liquid separation tank 304 into two streams: one stream of the discharged hydrogen 313 is sent to a TSA unit (temperature swing adsorption unit) or a hydrogenation plant, and can also be sent to a fuel gas system; the other stream is mixed with hydrogen 314, pressurized by compressor 306, and mixed with isomerization feed 208; after the liquid-phase material obtained by separation in the gas-liquid separation tank 304 is subjected to heat exchange in a heat exchanger V309, the heat-exchanged material 312 is used as C7Discharging the lower light hydrocarbon;
the process flow of the conventional xylene plant is as follows: containing C8The aromatic hydrocarbon mixture raw material 404 enters a xylene column 401 for fractionation, after heat exchange is carried out on the overhead material by a heat exchanger I402, one part of the overhead material is returned to the xylene column 401 as reflux, and the other part of the overhead material is used as adsorption separation feed 405, and after heat exchange is carried out on the overhead material and the feed of a deheptanizer 602 by a heat exchanger VI609, the overhead material is sent to an adsorption separation column 501; the bottom material of the tower returns to the xylene tower 401 after passing through the xylene reboiling furnace 403 and the temperature is raised, and the other part of the bottom material 406 is C9 +An aromatic hydrocarbon. The tower top material flow is mainly used as a heat source of a reboiler of the raffinate tower 503 and a reboiler of the extract tower 502; the bottoms stream serves primarily as the heat source for the finishing column reboiler 506 and the deheptanizer 602 reboilers.
The adsorption separation feeding 507 is subjected to adsorption separation by an adsorption separation tower 501, the obtained p-xylene-rich extract enters an extract tower 502 for fractionation, the tower bottom material is a desorbent, and is mixed with the tower bottom material of a raffinate tower 503 to be used as a heat source of a finished product tower reboiler 505 and then returns to the adsorption separation tower 501; the material at the top of the extract tower 502 enters a finished product tower 504, the material at the bottom of the finished product tower is p-xylene 509, and the material at the top of the tower is toluene 508. The p-xylene depleted raffinate obtained by adsorption separation in the adsorption separation tower enters a raffinate tower 503, the upper side line material 510 passes through a heat exchanger III606 and a heat exchanger IV607 in sequence, exchanges heat with the deheptanizer feed and the isomerization reaction product respectively, then enters an isomerization reactor 601 for isomerization reaction after being heated by an isomerization reaction heating furnace 605, and the reaction product enters a gas-liquid separation tank 604 after being exchanged heat by the heat exchanger IV607, cooled by an air cooler 611 and a water cooler 612 and separated into a gas-liquid two phase;
the gas phase is discharged from the top of the knock-out pot 604 to be divided into two streams: one stream of the externally discharged hydrogen 613 is sent to a TSA unit (temperature swing adsorption unit) or a hydrogenation plant, and can also be sent to a fuel gas system; the other stream is mixed with hydrogen 614, pressurized by a compressor 610 and mixed with the isomerization feed; the liquid phase material obtained by separation in the gas-liquid separation tank 604 enters the deheptanizer 602 after heat exchange in the heat exchanger III606, the heat exchanger V608 and the heat exchanger VI 609. The material at the top of the deheptanizer 602 is C7The bottom material of the light hydrocarbon 615 is returned to the xylene column 401 after passing through a heat exchanger V608 and unsaturated hydrocarbons such as olefin are removed by a clay column 603.
The effect of the novel p-xylene production process provided by the present invention is specifically illustrated by the following examples.
Comparative example 1
Comparative example 1 illustrates the process and energy consumption of a conventional para-xylene production process. The equipment used is shown in Table 1, and the plant operating parameters and energy consumption are shown in Table 2.
Example 1
Example 1 illustrates the process and energy consumption of the novel para-xylene production process provided by the present invention, wherein the isomerization rectification overhead product leaves the unit directly without separation and the hydrogen required for the isomerization is mixed with the isomerization feed after being pressurized by a compressor. The energy consumption of the apparatus is shown in Table 2.
TABLE 1
TABLE 2
As can be seen from tables 1 and 2, the process for producing paraxylene according to the present invention can save the investment of 1 set of rectification column, cooler reboiler equipment, and 1 gas-liquid separation tank, air cooler, water cooler, and separate isomerization reactor, compared to comparative example 1. The method provided by the invention not only reduces the number of equipment, but also reduces the energy consumption by 19.8%. Therefore, the novel method for producing the paraxylene provided by the invention can reduce equipment investment and floor area, reduce the operation load of the xylene tower and save the fuel gas consumption of the xylene reboiling furnace. Simultaneously, the isomerization reaction and the separation of the product are carried out simultaneously, so that the coupling utilization of energy is realized; the method has the advantages of optimizing a heat exchange network, improving the temperature of the isomerization reaction feeding furnace, reducing the consumption of fuel gas of the isomerization reaction heating furnace and the cooling load of water cooling and air cooling after the isomerization reaction product, avoiding the problem that the material is cooled first and then heated, greatly reducing the energy consumption and improving the economic benefit and the social benefit.
Claims (19)
1. An apparatus for producing an aromatic hydrocarbon product includes a xylene fractionation unit, an adsorption separation unit, and an isomerization reaction unit; the method is characterized in that: the xylene fractionation unit comprises a xylene tower, a heat exchanger I and a xylene reboiling furnace; the adsorption separation unit comprises an adsorption separation tower, an extract liquid fractionating tower, a raffinate tower and a heat exchanger II; the isomerization reaction unit comprises an isomerization reaction rectifying tower, a clay tower, an isomerization reaction heating furnace, a heat exchanger III, a heat exchanger IV, a heat exchanger VI and a compressor;
the xylene fractionation unit further comprises a unit for fractionating C8The aromatic hydrocarbon mixture raw material is fed into a feed pipeline of the xylene tower; a pipeline for sending the tower top discharge to a heat exchanger I; circulating a part of the discharged material at the top of the tower after heat exchange by the heat exchanger I back to a pipeline of the xylene tower; the other part of the tower top discharge after heat exchange by the heat exchanger I is sent to a pipeline of the adsorption separation unit; a feed line for feeding a portion of the bottoms to a bottom reboiling furnace; a line for recycling the bottom material heated by the bottom reboiling furnace to the xylene column; the other part of the tower bottom material is discharged out of a pipeline of the xylene tower; wherein the top discharge of the tower is C8Aromatic hydrocarbon, the material at the bottom of the tower is C9 +Aromatic hydrocarbons;
the adsorption separation unit also comprises a pipeline for feeding the tower top discharge of the xylene fractionation unit after heat exchange to an adsorption separation tower, a pipeline for delivering the separated p-xylene-rich extract to an extract fractionation tower, and a pipeline for delivering the p-xylene-poor raffinate obtained by adsorption separation of the adsorption separation tower to a raffinate tower; a pipeline for discharging the materials at the top of the extract fractionating tower and a pipeline for discharging the materials at the side line of the extract fractionating tower; the method comprises the following steps of (1) sending an extract fractionating tower bottom material to a pipeline of a heat exchanger II, sending a raffinate tower bottom material to a pipeline of the heat exchanger II, and sending the extract fractionating tower bottom material and the raffinate tower bottom material subjected to heat exchange to a pipeline of an adsorption separation tower; feeding the side line discharge at the upper part of the raffinate tower into a pipeline of an isomerization reaction unit after heat exchange of a heat exchanger II;
the isomerization reaction unit also comprises a feeding pipeline for feeding the isomerization reaction to an isomerization reaction zone of the isomerization reaction rectifying tower, and the feeding pipeline is sequentially connected with a heat exchanger III, a heat exchanger IV and an isomerization reaction heating furnace before being connected with the isomerization reaction rectifying tower; the material C at the top of the isomerization reaction rectifying tower7A discharge line for discharging the light hydrocarbon and hydrogen; feeding the side-line material of the isomerization reaction rectifying tower into a feeding pipeline of the clay tower, wherein the feeding pipeline is connected with a heat exchanger III in front of the clay tower; connecting a discharging pipeline at the bottom of the carclazyte tower with a heat exchanger VI, and connecting a pipeline after heat exchange with an adsorption separation feeding pipeline; and a discharge pipeline for discharging the bottom product of the isomerization reaction rectifying tower is connected with a heat exchanger VI before discharging.
2. The apparatus of claim 1, wherein: the heat exchanger I is used for taking the xylene overhead material flow as a heat source of a reboiler of a raffinate tower and a reboiler of a draw liquid fractionating tower, one part of condensed liquid after heat exchange is taken as reflux and returned to the xylene tower, and the other part of condensed liquid is taken as adsorption separation feeding.
3. The apparatus of claim 1, wherein: the adsorption separation tower is used for separating paraxylene and isomers thereof in materials from a xylene fractionation unit to obtain a paraxylene-rich extract and a paraxylene-poor raffinate.
4. The apparatus of claim 1, wherein: the extract fractionating tower is used for separating toluene, paraxylene and desorbent in the paraxylene-rich extract to obtain a high-purity paraxylene product; the extract fractionating tower adopts a dividing wall tower, the material at the bottom of the tower is a desorbent, the material at the top of the tower is toluene, and the material at the side line is a paraxylene product.
5. The apparatus of claim 1, wherein: the raffinate tower is used for separating C in the p-xylene-poor raffinate8The components and the desorbent are discharged from the upper side line of the raffinate tower as the lean p-xylene C8The components, the discharge from the bottom of the tower is the desorbent.
6. The apparatus of claim 1, wherein: the isomerization reaction rectifying tower adopts a partition plate type reaction rectifying tower form, one side of the partition plate is provided with an isomerization reaction zone, an isomerization catalyst is filled in the reaction zone, and the isomerization reaction rectifying tower is used for absorbing the p-xylene lean C from the adsorption separation unit8The component is converted into the paraxylene-rich C by isomerization reaction8The components are simultaneously separated from the reaction product, and the material at the top of the tower is rectified to be C7Light hydrocarbon and hydrogen, the material at the bottom of the tower is C9 +Aromatic hydrocarbon component, side stream material is C8An aromatic hydrocarbon.
7. The apparatus of claim 1, wherein: the heat exchanger III is used for exchanging heat between the side line material of the isomerization reaction rectifying tower as the clay tower feeding material and the isomerization feeding material, improving the isomerization feeding temperature and reducing the clay tower feeding temperature to the proper temperature.
8. The apparatus of claim 1, wherein: the heat exchanger IV is used for feeding the adsorption separation tower and the isomerization reaction, improving the isomerization feeding temperature and reducing the feeding temperature of the adsorption separation tower to a proper temperature.
9. The apparatus of claim 1, wherein: the heat exchanger VI is used for exchanging heat between the tower bottom material of the isomerization reaction rectifying tower and the clay tower discharging material, and improving the clay tower discharging temperature; the clay tower discharging after heat exchange is the feeding of the adsorption separation tower.
10. The apparatus of claim 1, wherein: the isomerization reaction unit is provided with a gas-liquid separation tank, an air cooler and a heat exchanger V; the gas-liquid separation tank is used for separating the material C at the top of the isomerization reaction rectifying tower7The hydrogen and other components in the following light hydrocarbon are discharged outside the gas phase part, and the gas phase part returns to the isomerization rectifying tower after pressurization, heat exchange and/or heating; the liquid phase is subjected to heat exchange and then is taken out of the device as a light hydrocarbon product; the heat exchanger V is used for liquid-phase light hydrocarbon products of the gas-liquid separation tank and materials (C) at the top of the isomerization reaction rectifying tower7The following light hydrocarbons and hydrogen) heat exchange; the air cooler is used for further reducing the overhead material (C) of the isomerization reaction rectifying tower7The following light hydrocarbons and hydrogen); the device also comprises a feeding pipeline for feeding the material at the top of the isomerization reaction rectifying tower into the gas-liquid separation tank, wherein the feeding pipeline is sequentially connected with a heat exchanger V and an air cooler before being connected with the gas-liquid separation tank; a discharge pipeline for discharging at least a part of the gas phase separated by the gas-liquid separation tank outwards, and a pipeline for recycling the rest of the gas phase to the isomerization reaction rectifying tower; and a discharge line for discharging the liquid phase separated in the gas-liquid separation tank.
11. A process for producing an aromatic hydrocarbon product, comprising: containing C8The aromatic hydrocarbon mixture raw material enters a xylene tower for fractionation, after heat exchange is carried out on the tower top material by a heat exchanger I, one part of the tower top material is returned to the xylene tower as reflux, the other part of the tower top material is used as adsorption separation feeding material, and after heat exchange is carried out on the tower top material and isomerization reaction feeding material by a heat exchanger IV, the tower top material is sent to an adsorption separation tower; the bottom material of the tower returns to the xylene tower after passing through the xylene reboiling furnace and being heated, and the other part of the bottom material of the tower is C9 +Aromatic hydrocarbons; the adsorption separation feeding is subjected to adsorption separation by an adsorption separation tower, the obtained p-xylene-rich extract enters an extract fractionating tower for fractionation, the tower bottom material is a desorbent, and after being mixed with the raffinate tower bottom material, the desorbent exchanges heat with the isomerization reaction feeding by a heat exchanger II and returns to the adsorption separation tower; toluene is taken as a material at the top of the extract fractionating tower, and paraxylene is taken as a material at the side line; the low-p-xylene raffinate obtained by the adsorption separation of the adsorption separation tower enters a raffinate tower for fractionation, the materials on the upper side line sequentially flow through a heat exchanger II, a heat exchanger III and a heat exchanger IV to exchange heat with a desorbent, a carclazyte tower feed and an adsorption separation feed respectively, then enter an isomerization reaction zone of an isomerization reaction rectifying tower for isomerization reaction after being heated by an isomerization reaction heating furnace, and simultaneously, reaction products are separated, wherein the material on the top of the tower is C7The side stream material is heat exchanged in heat exchanger VI, enters clay tower to eliminate unsaturated hydrocarbon, and is returned to dimethyl benzene tower as adsorbing and separating material, and the bottom material is C9 +An aromatic hydrocarbon.
12. The process of claim 11, wherein: the material at the top of the isomerization reaction rectifying tower exchanges heat through a heat exchanger V, is cooled through an isomerization reaction product air cooler, enters a gas-liquid separation tank, and is separated into a gas-liquid two phase; the gas phase is discharged from the top of the gas-liquid separation tank and divided into two parts: one strand is discharged outside; the other strand is mixed with hydrogen, pressurized by a compressor and mixed with an isomerization reaction feed; the liquid phase material obtained by the separation of the gas-liquid separation tank is used as C after heat exchange of the heat exchanger V7The following light hydrocarbons.
13. The process of claim 11, wherein: the isomerization reaction rectifying tower is in a partition type reaction rectifying tower form, a vertical partition is generally arranged in the middle of a traditional rectifying tower, and the rectifying tower is divided into an upper public rectifying section, a lower public stripping section, a rectifying feeding section and a side line extracting section which are separated by the partition; one side of the partition board is provided with an isomerization reaction zone, and the isomerization reaction and the separation of reaction products are realized in one tower.
14. The process of claim 11, wherein: the top pressure of the xylene tower is 0.3-2.5 MPa, and the temperature of the top of the xylene tower is 50-300 ℃; the xylene tower is preferably a plate tower, and the number of plates is 150-200.
15. The process of claim 11, wherein: the operating conditions of the adsorption separation unit are as follows: the temperature is 100-300 ℃, and the pressure is 0.2-1.5 MPa.
16. The process of claim 11, wherein: the operation conditions of the extract tower are as follows: the pressure at the top of the tower is 0.1-0.5 MPa, and the temperature at the top of the tower is 100-220 ℃.
17. The process of claim 11, wherein: the operation conditions of the raffinate tower are as follows: the pressure at the top of the tower is 0.1-1.0 MPa, and the temperature at the top of the tower is 120-170 ℃.
18. The process of claim 11, wherein: the isomerization rectifying tower has the tower top pressure of 0.2-2.5 MPa, the tower top temperature of 150-300 ℃ and the mass space velocity of 2-10 h-1And the molar ratio of the hydrogen to the reaction feed is 2-8.
19. The process of claim 11, wherein: the isomerization reaction conditions are as follows: the reaction temperature is 300-450 ℃, the pressure is 0.1-2.0 MPa, and the mass space velocity is 2-10 h-1The molar ratio of the reaction hydrogen to the hydrocarbon is 2 to 8.
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