CN112898110B - Method for preparing alpha-high-carbon olefin by dehydrating high-carbon alcohol - Google Patents
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 47
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 title claims abstract description 43
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000003054 catalyst Substances 0.000 claims abstract description 29
- 238000006243 chemical reaction Methods 0.000 claims abstract description 28
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000010335 hydrothermal treatment Methods 0.000 claims abstract description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 28
- KBPLFHHGFOOTCA-UHFFFAOYSA-N caprylic alcohol Natural products CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 claims description 16
- 229910052757 nitrogen Inorganic materials 0.000 claims description 14
- 238000006297 dehydration reaction Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 12
- 230000018044 dehydration Effects 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 9
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 8
- 150000001298 alcohols Chemical class 0.000 claims description 6
- 229910006415 θ-Al2O3 Inorganic materials 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 239000007791 liquid phase Substances 0.000 claims description 5
- 150000001336 alkenes Chemical class 0.000 claims description 4
- -1 carbon olefin Chemical class 0.000 claims description 4
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 claims description 4
- 229910052594 sapphire Inorganic materials 0.000 claims description 2
- 239000011148 porous material Substances 0.000 claims 2
- 239000012159 carrier gas Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 3
- 238000002203 pretreatment Methods 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 239000007789 gas Substances 0.000 description 11
- 239000006004 Quartz sand Substances 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- 239000002245 particle Substances 0.000 description 8
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 6
- 239000008367 deionised water Substances 0.000 description 6
- 229910021641 deionized water Inorganic materials 0.000 description 6
- 229920013639 polyalphaolefin Polymers 0.000 description 6
- 239000012298 atmosphere Substances 0.000 description 5
- 229910052593 corundum Inorganic materials 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- 229910001845 yogo sapphire Inorganic materials 0.000 description 5
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- ZSIAUFGUXNUGDI-UHFFFAOYSA-N hexan-1-ol Chemical compound CCCCCCO ZSIAUFGUXNUGDI-UHFFFAOYSA-N 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000005984 hydrogenation reaction Methods 0.000 description 3
- 239000002808 molecular sieve Substances 0.000 description 3
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 229920000092 linear low density polyethylene Polymers 0.000 description 2
- 239000004707 linear low-density polyethylene Substances 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 229920006124 polyolefin elastomer Polymers 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000001308 synthesis method Methods 0.000 description 2
- 239000010689 synthetic lubricating oil Substances 0.000 description 2
- AFFLGGQVNFXPEV-UHFFFAOYSA-N 1-decene Chemical compound CCCCCCCCC=C AFFLGGQVNFXPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 230000006353 environmental stress Effects 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000010688 mineral lubricating oil Substances 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 238000006384 oligomerization reaction Methods 0.000 description 1
- 229920006280 packaging film Polymers 0.000 description 1
- 239000012785 packaging film Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 150000003138 primary alcohols Chemical class 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 239000009106 shengqing Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910003158 γ-Al2O3 Inorganic materials 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C1/00—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon
- C07C1/20—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon starting from organic compounds containing only oxygen atoms as heteroatoms
- C07C1/24—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon starting from organic compounds containing only oxygen atoms as heteroatoms by elimination of water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/02—Boron or aluminium; Oxides or hydroxides thereof
- B01J21/04—Alumina
-
- B01J35/613—
-
- B01J35/615—
-
- B01J35/633—
-
- B01J35/635—
-
- B01J35/647—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/10—Heat treatment in the presence of water, e.g. steam
Abstract
The invention provides a pretreatment method of a catalyst for preparing alpha-high-carbon olefin by dehydrating high-carbon alcohol, which solves the problems of low activity, low selectivity and poor stability of an alumina catalyst in the prior art. In the invention, the method of high-temperature roasting and hydrothermal treatment is adopted to treat alumina, so that the performance of the catalyst can be obviously improved, the conversion rate of high-carbon alcohol can reach more than 99%, the selectivity for producing alpha-high-carbon olefin can reach more than 97%, long-period operation is basically unchanged, and the catalyst has excellent stability.
Description
Technical Field
The invention relates to a pretreatment method for preparing an alpha-high-carbon olefin catalyst by dehydrating high-carbon alcohol.
Technical Field
The alpha-high carbon olefin plays an important role in the upgrading of domestic polyolefin industry and the development of high-efficiency synthetic lubricating oil.
HDPE, LLDPE, polyolefin elastomer (POE) are mainly copolymerized by n-butene, n-hexene or n-octene. Compared with n-butene as comonomer, LLDPE produced by n-hexene and n-octene as comonomer has obvious advantages in the aspects of tensile strength, impact strength, tear strength, puncture resistance, environmental stress crack resistance and the like, and is particularly suitable for producing packaging films, agricultural films, large-caliber pipes and the like.
The poly-alpha-olefin synthetic oil (PAO) generated by alpha-decene polymerization is used as a synthetic hydrocarbon-based lubricating oil with wider use, the performance of the poly-alpha-olefin synthetic oil is far superior to that of the traditional mineral lubricating oil, the yield of the poly-alpha-olefin synthetic oil (PAO) currently accounts for about 45 percent of the market share of the synthetic lubricating oil in the world, and the catalytic oligomerization and hydrogenation saturation of n-octene are important ways for preparing the PAO synthetic oil.
At present, high-carbon alcohol has wide sources, and can be divided into natural alcohol and synthetic alcohol according to production raw materials. Compared with natural alcohol prepared by a fatty acid hydrogenation method or an oil hydrogenation method and synthetic alcohol prepared by a Ziegler method or a oxo synthesis method, the high-carbon alcohol directly prepared by the Fischer-Tropsch synthesis method is not influenced by regions, climate and policies, and has the advantages of simple technology, short process and obvious advantages. Meanwhile, in the industrial production practice, the purity of the high-carbon alcohol in the Fischer-Tropsch synthesis product can be improved to more than 95% by the prior art.
In conclusion, the development of the technology for preparing alpha-high carbon olefin by dehydrating high carbon alcohol has important significance for the development of polyolefin industry and the synthesis of lubricating oil.
In the field of olefin preparation through alcohol dehydration, researchers mainly focus on the research on lower alcohols such as ethanol and propanol, and relatively few reports are made on the research on the dehydration of higher alcohols such as octanol. The research result of the dehydration of the low-carbon alcohol is used for reference, and can be seen as follows: under the same reaction condition, the shorter the carbon chain is, the more difficult the conversion rate of the raw material alcohol is to be improved; the longer the carbon chain, the more difficult it is to increase the selectivity of normal olefins, so for the reaction of preparing octenes by dehydrating higher alcohols, the research is focused on how to increase the conversion rate of higher alcohols and how to decrease the selectivity of isoolefins in the product.
Experiments by high-priority et al (research on synthesis of 1-olefin by dehydration of primary alcohol under catalysis of modified alumina, university of great unionism, 7 months 2001, volume 41, phase 4, and P412-415) show that the increase of the alumina acid strength is favorable for the improvement of the conversion rate of raw material alcohol, but the decrease of the acid strength is favorable for the improvement of the n-olefin selectivity, and the modified alumina has the advantages that the conversion rate of n-hexanol reaches 97.8% and the n-hexanol selectivity reaches 93.3% at the reaction temperature of 340 ℃. The method for treating ZSM-5 molecular sieve by water vapor enables the number of acid centers of ZSM-5 molecular sieve to be reduced and the acid strength to be weakened by the method of water vapor treatment by Shengqing et al (influence of water vapor and hydrochloric acid treatment on the performance of ZSM-5 molecular sieve, university of Taiyuan, 7 months 2012, volume 43, 4 th period, P425-P430), thereby improving the selectivity of ethylene and the stability of catalyst.
However, there is still a need in the art to provide a pretreatment method for preparing α -high olefins by dehydration of high alcohols, so that the catalyst has both high activity and high selectivity, and more importantly, good stability.
Disclosure of Invention
The key problem to be solved by the invention is how to keep higher conversion rate of the high-carbon alcohol, improve the selectivity of the target product alpha-high-carbon olefin as much as possible, keep good stability, and simultaneously consider the economic problem of the catalyst, so that the catalyst has the advantage of low catalytic cost.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the n-octanol which is sold in the market is selected as the raw material for the reaction of the higher alcohol, and the weight percentage concentration of the octanol in the mixture containing water or ethanol is 10-100 percent.
The selected commercial alumina is alpha-Al2O3、θ-Al2O3Or gamma-Al2O3In one, the catalyst has a particle size of 10-80 mesh, preferably spherical or crumbly.
Roasting the alumina at 473-1173K for 2-20 hours in air or nitrogen atmosphere; loading the mixture into a fixed bed reactor, and heating to 373-773K under the nitrogen atmosphere, wherein the nitrogen pressure is 0.1-30 MPa, and the heating rate is 1-10K/min; introducing water vapor to carry out hydrothermal treatment at 373-773K under nitrogen atmosphere, wherein the airspeed of the water vapor is 0.1-1 h-1The hydrothermal treatment time is 1-20 h.
Prepared according to the schemeThe alumina catalyst is used for carrying out a reaction activity evaluation experiment for preparing the octylene by octanol dehydration in a fixed bed tubular reactor, and the reaction conditions are as follows: the reaction pressure is 0.1-3 MPa, the reaction temperature is 473-700K, and the liquid phase space velocity of the octanol feeding reaction is 0.1-1 h-1The gas space velocity of nitrogen is 1000-2000h-1(ii) a The final desired product is n-octene.
The method of high-temperature roasting and hydrothermal treatment can obviously improve the performance of the catalyst, the conversion rate of high-carbon alcohol can reach more than 99 percent, the selectivity for producing alpha-high-carbon olefin can reach more than 97 percent, and the long-period operation is basically unchanged, so that the catalyst has excellent stability.
The invention will be further elucidated by means of some examples.
Detailed Description
[ example 1 ]
3 g of alpha-Al are weighed2O3The particle size is 20-40 meshes, the mixture is put into a muffle furnace to be roasted for 4 hours under the air atmosphere at 773K, the mixture is put into a fixed bed reactor, the upper end and the lower end of the fixed bed reactor are respectively filled with quartz sand with equal quantity, nitrogen is introduced, and the volume space velocity of the gas is 1500 hours-1The temperature rising rate is 2K/min, the temperature of the constant temperature zone in the middle of the reactor rises to 373K and is constant, deionized water is introduced, and the volume space velocity is 0.5h-1Continuously carrying out hydrothermal treatment for 5h, and taking out alumina to obtain the catalyst HT1/Al2O3。
[ example 2 ]
3 g of alpha-Al are weighed2O3The particle size is 20-40 meshes, the mixture is put into a muffle furnace to be roasted for 10 hours under the air atmosphere of 573K, the mixture is put into a fixed bed reactor, the upper end and the lower end of the fixed bed reactor are respectively filled with equal amount of quartz sand, nitrogen is introduced, and the volume space velocity of the gas is 500 hours-1The temperature rise rate is 5K/min, the temperature of the constant temperature area in the middle of the reactor is raised to 473K and is kept constant, deionized water is introduced, and the volume space velocity is 0.2h-1Continuously carrying out hydrothermal treatment for 10h, and taking out alumina to obtain the catalyst HT2/Al2O3。
[ example 3 ] A method for producing a polycarbonate
Weighing 3 g of theta-Al2O3The grain diameter is 60-80 meshes, and the mixture is put into a muffle furnace in air atmosphereRoasting at 873K for 8 hours, loading into a fixed bed reactor, respectively loading equal amount of quartz sand at the upper end and the lower end, introducing nitrogen, and controlling the volume space velocity of the gas to be 500h-1The heating rate is 8K/min, the temperature of the constant temperature area in the middle of the reactor is increased to 573K and is kept constant, deionized water is introduced, and the volume space velocity is 0.8h-1Continuously carrying out hydrothermal treatment for 8h, and taking out alumina to obtain the catalyst HT3/Al2O3。
[ example 4 ]
Weighing 3 g of theta-Al2O3The particle size is 60-80 meshes, the mixture is put into a muffle furnace to be roasted for 15 hours at 673K in the air atmosphere, the mixture is put into a fixed bed reactor, the upper end and the lower end of the fixed bed reactor are respectively filled with equal amount of quartz sand, nitrogen is introduced, and the volume space velocity of the gas is 800 hours-1The heating rate is 10K/min, the temperature of the constant temperature zone in the middle of the reactor is raised to 673K and is kept constant, deionized water is introduced, and the volume space velocity is 1.0h-1Continuously carrying out hydrothermal treatment for 10h, and taking out alumina to obtain the catalyst HT4/Al2O3。
[ example 5 ]
3 g of gamma-Al are weighed2O3The particle size is 60-80 meshes, the mixture is put into a muffle furnace to be roasted for 10 hours under the air atmosphere of 1173K, the mixture is put into a fixed bed reactor, equal amount of quartz sand is respectively put into the upper end and the lower end of the fixed bed reactor, nitrogen is introduced, and the volume space velocity of the gas is 300 hours-1The heating rate is 5K/min, the temperature of the constant temperature area in the middle of the reactor is increased to 773K and is kept constant, deionized water is introduced, and the volume space velocity is 0.3h-1Continuously carrying out hydrothermal treatment for 2h, and taking out alumina to obtain the catalyst HT5/Al2O3。
Comparative example 1
Weighing 3 g of theta-Al2O3The particle size is 60-80 meshes, the mixture is put into a muffle furnace to be roasted for 8 hours at 873K in the air atmosphere, the mixture is put into a fixed bed reactor, equal amount of quartz sand is respectively put into the upper end and the lower end of the fixed bed reactor, nitrogen is introduced, and the volume space velocity of the gas is 500 hours-1Heating at 8K/min, heating to 573K in constant temperature region in the middle of the reactor, heating for 8 hr, and taking out alumina to obtain catalyst Al2O3-1。
Comparative example 2
Weighing 3 g of theta-Al2O3The particle size is 60-80 meshes, the mixture is filled into a fixed bed reactor, the upper end and the lower end of the fixed bed reactor are respectively filled with quartz sand with the same amount, nitrogen is introduced, and the volume space velocity of the gas is 500h-1The heating rate is 8K/min, the temperature of the constant temperature area in the middle of the reactor is increased to 573K and is kept constant, deionized water is introduced, and the volume space velocity is 0.8h-1Continuously carrying out hydrothermal treatment for 8h, and taking out alumina to obtain catalyst Al2O3-2。
Comparative example 3
3 g of alpha-Al are weighed2O3The particle size is 60-80 meshes, the mixture is filled into a fixed bed reactor, the upper end and the lower end of the fixed bed reactor are respectively filled with quartz sand with the same amount, nitrogen is introduced, and the volume space velocity of the gas is 500h-1The temperature rising rate is 5K/min, the temperature of a constant temperature area in the middle of the reactor rises to 773K and is constant, the alumina is taken out after continuous heating is carried out for 10 hours, and the catalyst Al is prepared2O3-3。
The dehydration performance evaluation of the catalyst was carried out in a stainless steel fixed bed tubular reactor having an inner diameter of 10mm and a length of 400mm, the catalyst loading was 3mL, the upper and lower ends of the reactor were charged with equal amounts of quartz sand, respectively, the temperature in the middle constant temperature zone of the reactor was 573K, the nitrogen atmosphere, and the gas volume space velocity was 1500h-1The reaction pressure is 0.5MPa, the high carbon alcohol with the weight percentage concentration of 100 percent is taken as the raw material, and the volume space velocity of the liquid phase is 0.5h-1After the continuous reaction for 50 hours, the liquid phase product is analyzed by an Agilent 7890B gas chromatograph, the area normalization method is adopted for calculating the result, and the reaction data are shown in Table 1.
TABLE 1
The results show that: compared with an alumina catalyst which is not treated or is only roasted or is only subjected to hydrothermal treatment, the treated catalyst can obviously improve the selectivity of n-octene while keeping higher conversion rate of n-octanol, and has good industrial application prospect.
Claims (2)
1. The method for preparing alpha-high-carbon olefin by dehydrating high-carbon alcohol is characterized in that alumina subjected to high-temperature roasting and hydrothermal treatment is used as a catalyst, and the treatment method of the catalyst comprises the following steps:
(1) roasting the alumina at 473-1173K for 2-20 hours in air or nitrogen atmosphere;
(2) loading the roasted alumina into a fixed bed reactor, heating to 373-773K from room temperature in nitrogen atmosphere, wherein the volume space velocity of nitrogen is 1000-2000h-1Heating at a rate of 1-10K/min, introducing steam for hydrothermal treatment, wherein the volume space velocity of the steam is 0.1-1 h-1The hydrothermal treatment time is 1-20 h;
wherein the alumina is alpha-Al2O3、θ-Al2O3One or more than two of them; the pore volume of the catalyst obtained after treatment is 0.1-1.0 mL/g, the average pore diameter is 2-20 nm, and the specific surface area is 10m2/g~300m2/g；
The method for preparing alpha-high-carbon olefin by dehydrating high-carbon alcohol comprises the following steps of taking high-carbon alcohol as a raw material and nitrogen as a carrier gas in a fixed bed reactor, and enabling the high-carbon alcohol raw material and a catalyst to contact with each other to react to generate alpha-high-carbon olefin, wherein the specific conditions are as follows:
(A) the higher alcohol is n-octanol;
(B) the high-carbon alcohol reaction raw material is high-carbon alcohol with the weight percentage concentration of 10-100%;
(C) the liquid phase volume space velocity of the high-carbon alcohol feeding reaction is 0.1-1 h-1；
(D) The reaction temperature for preparing alpha-high-carbon olefin by dehydrating high-carbon alcohol is 473-700K;
(E) the reaction pressure for preparing alpha-high-carbon olefin by dehydrating high-carbon alcohol is 0.1-3 MPa;
(F) the alpha-high carbon olefin prepared by the dehydration of the high carbon alcohol is subjected to dehydration reaction in the nitrogen atmosphere, and the volume space velocity of the nitrogen is 1000-2000h-1。
2. The method according to claim 1, wherein the specific conditions for producing α -higher olefins by dehydration of higher alcohols are as follows:
(A) the higher alcohol is n-octanol;
(B) the high-carbon alcohol reaction raw material is high-carbon alcohol with the weight percentage concentration of 100 percent;
(C) the liquid phase volume space velocity of the high-carbon alcohol feeding reaction is 0.5h-1；
(D) The reaction temperature for preparing alpha-high-carbon olefin by dehydrating the high-carbon alcohol is 573K;
(E) the reaction pressure for preparing alpha-high-carbon olefin by dehydrating high-carbon alcohol is 0.5 MPa;
(F) the alpha-high-carbon olefin prepared by the dehydration of the high-carbon alcohol is subjected to dehydration reaction in the nitrogen atmosphere, and the volume space velocity of the nitrogen is 1500h-1。
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