CN112457149A - Oil field associated gas aromatization integrated conversion system and method - Google Patents
Oil field associated gas aromatization integrated conversion system and method Download PDFInfo
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000010438 heat treatment Methods 0.000 claims abstract description 132
- 239000007788 liquid Substances 0.000 claims abstract description 122
- 239000003054 catalyst Substances 0.000 claims abstract description 52
- 238000001816 cooling Methods 0.000 claims abstract description 30
- 239000002994 raw material Substances 0.000 claims abstract description 16
- 239000002808 molecular sieve Substances 0.000 claims description 19
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- 229910052733 gallium Inorganic materials 0.000 claims description 17
- 229910052725 zinc Inorganic materials 0.000 claims description 17
- 239000000969 carrier Substances 0.000 claims description 16
- 239000013078 crystal Substances 0.000 claims description 11
- 238000004458 analytical method Methods 0.000 claims description 8
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical group N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 6
- 229910021529 ammonia Inorganic materials 0.000 claims description 3
- 238000005470 impregnation Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims 2
- 239000007789 gas Substances 0.000 description 77
- 239000003921 oil Substances 0.000 description 18
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 9
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 9
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 6
- 229930195733 hydrocarbon Natural products 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
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- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001294 propane Substances 0.000 description 3
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- 229910052799 carbon Inorganic materials 0.000 description 2
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- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2/00—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms
- C07C2/76—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by condensation of hydrocarbons with partial elimination of hydrogen
- C07C2/82—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by condensation of hydrocarbons with partial elimination of hydrogen oxidative coupling
- C07C2/84—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by condensation of hydrocarbons with partial elimination of hydrogen oxidative coupling catalytic
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2529/00—Catalysts comprising molecular sieves
- C07C2529/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites, pillared clays
- C07C2529/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- C07C2529/40—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
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- Organic Chemistry (AREA)
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
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- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Abstract
The invention discloses an oil field associated gas aromatization integrated conversion system, which comprises a raw material gas cylinder, a first heating furnace, a first gas-liquid condenser, a second heating furnace, a second gas-liquid condenser, a third heating furnace, a third gas-liquid condenser and a gas chromatograph which are sequentially connected; also comprises a cooling circulating pump; catalyst beds are arranged in the first heating furnace, the second heating furnace and the third heating furnace; the bin walls of the first gas-liquid condenser, the second gas-liquid condenser and the third gas-liquid condenser are all of sandwich structures, and cooling media are arranged in the sandwich layers; and the bin walls of the first gas-liquid condenser, the second gas-liquid condenser and the third gas-liquid condenser are sequentially connected with a cooling circulating pump to form a circulating loop. Meanwhile, the invention also discloses a method for performing oil field associated gas aromatization integrated conversion by adopting the system. The invention can make different components in the associated gas react in sequence under different temperatures and different catalysts in three sections to obtain the aromatization product with high yield.
Description
Technical Field
The invention belongs to the technical field of associated gas aromatization, and particularly relates to an integrated conversion system for oil field associated gas aromatization.
Background
Aromatic hydrocarbon is one of important chemical products, and plays an extremely important role in national economy. Aromatic hydrocarbon is also one of the major business in the petrochemical industry in China, and is an important organic chemical raw material with the yield and the scale second to that of ethylene and propylene. Aromatic hydrocarbon derivatives are widely used for producing chemical products such as chemical fibers, plastics and rubbers and fine chemicals. The main products of the aromatics plant are benzene, para-xylene and ortho-xylene. In recent years, with the massive construction of production devices for styrene, phenol, aniline, cyclohexanone and the like, the production capacity of benzene downstream products in China is rapidly increased, and the market demand of benzene is greatly increased.
Associated gas is one of natural gas resources, and is gas-cap gas, oil-dissolved gas and gas-cap gas between oil reservoirs or above and below the oil reservoirs, which are closely distributed with the oil reservoirs in the oil reservoir range, and is usually a volatile part in crude oil. The associated gas mainly comprises hydrocarbon gas, and mainly comprises methane, ethane, propane, butane and the like. Associated gas is used as a resource with wide application, and is limited by technical conditions and a recovered gas outlet in the past, so that associated gas of some oil fields is in a venting and burning state all the year round, and great resource waste and environmental pollution are caused.
The cyclic process for aromatizing liquefied gas is an aromatization process technology which is developed by UOP company and BP company jointly and is used for realizing industrialization at the earliest in the world. The process selectively converts liquefied petroleum gas (propane and butane) into light aromatic hydrocarbon (BTX) by a one-step method and produces a large amount of hydrogen. The first 40 million tons/year of industrialisation was put into operation in Ireland 1 month of 1990. Mitsubishi petroleum and Kyoda corporation jointly developed a new Z-Forming technology for producing BTX aromatics and hydrogen from LPG and light naphtha, and the products are aromatics, high-purity hydrogen and fuel gas. Mobil corporation of the United states in the middle of the 80 s developed the M2-Forming process. The process uses single low carbon hydrocarbon or industrial raw material such as naphtha, C5 distillate oil, light pyrolysis gasoline and the like for aromatization on a fixed bed by using ZSM-5 single function catalyst to produce aromatic hydrocarbon. The catalyst in the process has short on-line operation time and frequent regeneration.
The synthesis of the aromatic hydrocarbon from the associated gas has very important significance in the aspects of opening up new raw materials for producing the aromatic hydrocarbon, reasonably utilizing resources and improving the value of light hydrocarbon. Research on aromatization catalysts has been focused on HZSM-5 and its metal-modified catalysts, and the most research on modification with Pt, Zn, and Ga, and Ni and Ag as modification components. Among these modified metals, Pt is used earlier, but is expensive and susceptible to sulfur poisoning; ga has high activity in propane aromatization, but has weaker catalytic activity in C4+ hydrocarbon aromatization; zn has high dehydrogenation activity, shows high catalytic activity in aromatization reaction of C2-C9 hydrocarbons and has low price, so in recent years, the research report of Zn on HZSM-5 modification for low-carbon hydrocarbon aromatization is obviously more than that of other metal modified catalysts. In the prior art, the system for directly aromatizing associated gas has the defect of low yield.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an integrated conversion system and method for aromatization of associated gas of an oil field, and the yield of aromatic hydrocarbon is high.
An oil field associated gas aromatization integrated conversion system comprises a raw material gas cylinder, a first heating furnace, a first gas-liquid condenser, a second heating furnace, a second gas-liquid condenser, a third heating furnace, a third gas-liquid condenser and a gas chromatograph which are sequentially connected; also comprises a cooling circulating pump;
catalyst beds are arranged in the first heating furnace, the second heating furnace and the third heating furnace;
the bin walls of the first gas-liquid condenser, the second gas-liquid condenser and the third gas-liquid condenser are all of sandwich structures, and cooling media are arranged in the sandwich layers;
and the bin walls of the first gas-liquid condenser, the second gas-liquid condenser and the third gas-liquid condenser are sequentially connected with a cooling circulating pump to form a circulating loop.
Preferably, the first heating furnace, the second heating furnace and the third heating furnace are all vertical heating furnaces.
Preferably, the height-diameter ratio of the catalyst bed is (2-5): 1.
preferably, the first gas-liquid condenser, the second gas-liquid condenser and the third gas-liquid condenser are vertical or horizontal.
Preferably, the cooling circulation pump is a centrifugal pump, a vortex pump or a plunger pump.
The method for performing oil field associated gas aromatization integrated conversion by adopting the system comprises the following steps:
(1) adjusting the temperatures of the first heating furnace, the second heating furnace and the third heating furnace to 360 ℃, 450 ℃, 500 ℃ and 620 ℃ respectively, and adjusting the reaction pressures to 0.1-0.3 MPa;
(2) starting a cooling circulating pump, allowing associated gas to flow out of a raw material gas cylinder, sequentially passing through a first heating furnace, a first gas-liquid condenser, a second heating furnace, a second gas-liquid condenser, a third heating furnace and a third gas-liquid condenser, and performing online analysis through a gas chromatograph;
(3) collecting products of the first gas-liquid condenser, the second gas-liquid condenser and the third gas-liquid condenser to obtain an aromatization product;
the catalyst in the catalyst bed layer comprises modified components and carriers, the modified components of the catalysts in the first heating furnace and the second heating furnace are respectively Zn and Ga, the modified components of the catalyst in the third heating furnace are Zn and Ga with the mass ratio of 1:1, the carriers are all hollow shell type small crystal grain ZSM-5 molecular sieves, and the loading capacity of the modified components is 1-2 wt%.
Preferably, the space velocity of the associated gas is 1600-2000 mL/h.g.
Preferably, the catalyst is prepared by the following method: ammonia exchange is carried out on the carrier hollow shell type small crystal grain ZSM-5 molecular sieve to obtain an H-type molecular sieve, and then the modified components are respectively loaded on the H-type molecular sieve by adopting an impregnation method.
The invention has the advantages that:
by the conversion system provided by the invention, different components in the associated gas sequentially react at three sections of different temperatures and different catalysts to obtain an aromatization product, the yield is high, the process is simple and rapid, the adaptability is wide, the effective utilization of the associated gas is improved, and a new direction and thought are provided for reducing the greenhouse gas emission brought by directly burning the associated gas.
Drawings
FIG. 1 is a schematic diagram of the structure of a conversion system provided by the present invention;
the method comprises the following steps of 1-a raw material gas cylinder, 2-a first heating furnace, 3-a second heating furnace, 4-a third heating furnace, 5-a gas chromatograph, 6-a first gas-liquid condenser, 7-a second gas-liquid condenser, 8-a third gas-liquid condenser and 9-a cooling circulating pump.
Detailed Description
The preparation method of the catalyst used in the invention is as follows: ammonia exchange is carried out on the empty-shell type small-crystal-grain ZSM-5 molecular sieve to obtain an H-type molecular sieve, salt solution of a modification component is prepared, and then the modification component is respectively loaded on the H-type molecular sieve by adopting an impregnation method; wherein, the carrier hollow-shell type small crystal grain ZSM-5 molecular sieve is prepared by the molecular sieve prepared in patent CN104150507A example 1.
In the examples of the present invention, the specific components of associated gas are as follows:
example 1
An oil field associated gas aromatization integrated conversion system comprises a raw material gas cylinder 1, a first heating furnace 2, a first gas-liquid condenser 6, a second heating furnace 3, a second gas-liquid condenser 7, a third heating furnace 4, a third gas-liquid condenser 8 and a gas chromatograph 5 which are connected in sequence; also comprises a cooling circulating pump 9;
catalyst beds are arranged in the first heating furnace 2, the second heating furnace 3 and the third heating furnace 4;
the bin walls of the first gas-liquid condenser 6, the second gas-liquid condenser 7 and the third gas-liquid condenser 8 are all of sandwich structures, and cooling media are arranged in the sandwich layers;
and the bin walls of the first gas-liquid condenser 6, the second gas-liquid condenser 7 and the third gas-liquid condenser 8 are sequentially connected with a cooling circulating pump 9 to form a circulating loop.
Example 2
On the basis of the embodiment 1, the first heating furnace 2, the second heating furnace 3 and the third heating furnace 4 are vertical heating furnaces;
the height-diameter ratio of the catalyst bed layer is (2-5): 1;
the first gas-liquid condenser 6, the second gas-liquid condenser 7 and the third gas-liquid condenser 8 are vertical or horizontal.
The cooling circulating pump 9 is a centrifugal pump, a vortex pump or a plunger pump
Example 3
The method for performing oil field associated gas aromatization integrated conversion by adopting the system of the embodiment 2 comprises the following steps:
(1) adjusting the temperatures of the first heating furnace 2, the second heating furnace 3 and the third heating furnace 4 to 360 ℃, 470 ℃ and 640 ℃ respectively, and adjusting the reaction pressures to 0.1 MPa;
(2) starting a cooling circulating pump 9, allowing associated gas to flow out of a raw material gas cylinder 1, sequentially passing through a first heating furnace 2, a first gas-liquid condenser 6, a second heating furnace 3, a second gas-liquid condenser 7, a third heating furnace 4 and a third gas-liquid condenser 8, and performing online analysis through a gas chromatograph 5; the space velocity of associated gas is 1600 mL/h.g; the first gas-liquid condenser 6, the second gas-liquid condenser 7 and the third gas-liquid condenser 8 are vertical; the height-diameter ratio of the catalyst bed layer is 2: 1; the cooling circulating pump 9 is a centrifugal pump; the catalysts in the first heating furnace 2, the second heating furnace 3 and the third heating furnace 4 respectively comprise modified components and carriers, the modified components of the catalysts in the first heating furnace 2 and the second heating furnace 3 are respectively Zn and Ga, the modified components of the catalysts in the third heating furnace 4 are Zn and Ga with the mass ratio of 1:1, the carriers are all hollow shell type small crystal grain ZSM-5 molecular sieves, and the loading capacity of the modified components is 1 wt%;
(3) and collecting products of the first gas-liquid condenser 6, the second gas-liquid condenser 7 and the third gas-liquid condenser 8 to obtain an aromatization product.
Example 4
The method for performing oil field associated gas aromatization integrated conversion by adopting the system of the embodiment 2 comprises the following steps:
(1) adjusting the temperatures of the first heating furnace 2, the second heating furnace 3 and the third heating furnace 4 to 250 ℃, 480 ℃ and 650 ℃ respectively, and adjusting the reaction pressure to 0.2 MPa;
(2) starting a cooling circulating pump 9, allowing associated gas to flow out of a raw material gas cylinder 1, sequentially passing through a first heating furnace 2, a first gas-liquid condenser 6, a second heating furnace 3, a second gas-liquid condenser 7, a third heating furnace 4 and a third gas-liquid condenser 8, and performing online analysis through a gas chromatograph 5; the space velocity of associated gas is 2000 mL/h.g; the first gas-liquid condenser 6, the second gas-liquid condenser 7 and the third gas-liquid condenser 8 are vertical; the height-diameter ratio of the catalyst bed layer is 3: 1; the cooling circulating pump 9 is a centrifugal pump; the catalysts in the first heating furnace 2, the second heating furnace 3 and the third heating furnace 4 respectively comprise modified components and carriers, the modified components of the catalysts in the first heating furnace 2 and the second heating furnace 3 are respectively Zn and Ga, the modified components of the catalysts in the third heating furnace 4 are Zn and Ga with the mass ratio of 1:1, the carriers are all hollow shell type small crystal grain ZSM-5 molecular sieves, and the loading capacity of the modified components is 2 wt%;
(3) and collecting products of the first gas-liquid condenser 6, the second gas-liquid condenser 7 and the third gas-liquid condenser 8 to obtain an aromatization product.
Example 5
The method for performing oil field associated gas aromatization integrated conversion by adopting the system of the embodiment 2 comprises the following steps:
(1) adjusting the temperatures of the first heating furnace 2, the second heating furnace 3 and the third heating furnace 4 to 300 ℃, 490 ℃ and 630 ℃ respectively, and adjusting the reaction pressures to 0.1 MPa;
(2) starting a cooling circulating pump 9, allowing associated gas to flow out of a raw material gas cylinder 1, sequentially passing through a first heating furnace 2, a first gas-liquid condenser 6, a second heating furnace 3, a second gas-liquid condenser 7, a third heating furnace 4 and a third gas-liquid condenser 8, and performing online analysis through a gas chromatograph 5; the space velocity of associated gas is 1800 mL/h.g; the first gas-liquid condenser 6, the second gas-liquid condenser 7 and the third gas-liquid condenser 8 are vertical; the height-diameter ratio of the catalyst bed layer is 3: 1; the cooling circulating pump 9 is a centrifugal pump; the catalysts in the first heating furnace 2, the second heating furnace 3 and the third heating furnace 4 respectively comprise modified components and carriers, the modified components of the catalysts in the first heating furnace 2 and the second heating furnace 3 are respectively Zn and Ga, the modified components of the catalysts in the third heating furnace 4 are Zn and Ga with the mass ratio of 1:1, the carriers are all hollow shell type small crystal grain ZSM-5 molecular sieves, and the loading capacity of the modified components is 1 wt%;
(3) and collecting products of the first gas-liquid condenser 6, the second gas-liquid condenser 7 and the third gas-liquid condenser 8 to obtain an aromatization product.
Example 6
The method for performing oil field associated gas aromatization integrated conversion by adopting the system of the embodiment 2 comprises the following steps:
(1) adjusting the temperatures of the first heating furnace 2, the second heating furnace 3 and the third heating furnace 4 to 250 ℃, 500 ℃ and 650 ℃ respectively, and adjusting the reaction pressure to 0.2 MPa;
(2) starting a cooling circulating pump 9, allowing associated gas to flow out of a raw material gas cylinder 1, sequentially passing through a first heating furnace 2, a first gas-liquid condenser 6, a second heating furnace 3, a second gas-liquid condenser 7, a third heating furnace 4 and a third gas-liquid condenser 8, and performing online analysis through a gas chromatograph 5; the space velocity of associated gas is 1800 mL/h.g; the first gas-liquid condenser 6, the second gas-liquid condenser 7 and the third gas-liquid condenser 8 are vertical; the height-diameter ratio of the catalyst bed layer is 4: 1; the cooling circulating pump 9 is a centrifugal pump; the catalysts in the first heating furnace 2, the second heating furnace 3 and the third heating furnace 4 respectively comprise modified components and carriers, the modified components of the catalysts in the first heating furnace 2 and the second heating furnace 3 are respectively Zn and Ga, the modified components of the catalysts in the third heating furnace 4 are Zn and Ga with the mass ratio of 1:1, the carriers are all hollow shell type small crystal grain ZSM-5 molecular sieves, and the loading capacity of the modified components is 1 wt%;
(3) and collecting products of the first gas-liquid condenser 6, the second gas-liquid condenser 7 and the third gas-liquid condenser 8 to obtain an aromatization product.
Example 7
The method for performing oil field associated gas aromatization integrated conversion by adopting the system of the embodiment 2 comprises the following steps:
(1) adjusting the temperatures of the first heating furnace 2, the second heating furnace 3 and the third heating furnace 4 to 280 ℃, 450 ℃ and 620 ℃ respectively, and adjusting the reaction pressure to 0.1 MPa;
(2) starting a cooling circulating pump 9, allowing associated gas to flow out of a raw material gas cylinder 1, sequentially passing through a first heating furnace 2, a first gas-liquid condenser 6, a second heating furnace 3, a second gas-liquid condenser 7, a third heating furnace 4 and a third gas-liquid condenser 8, and performing online analysis through a gas chromatograph 5; the space velocity of associated gas is 1800 mL/h.g; the first gas-liquid condenser 6, the second gas-liquid condenser 7 and the third gas-liquid condenser 8 are vertical; the height-diameter ratio of the catalyst bed layer is 4: 1; the cooling circulating pump 9 is a centrifugal pump; the catalysts in the first heating furnace 2, the second heating furnace 3 and the third heating furnace 4 respectively comprise modified components and carriers, the modified components of the catalysts in the first heating furnace 2 and the second heating furnace 3 are respectively Zn and Ga, the modified components of the catalysts in the third heating furnace 4 are Zn and Ga with the mass ratio of 1:1, the carriers are all hollow shell type small crystal grain ZSM-5 molecular sieves, and the loading capacity of the modified components is 1 wt%;
(3) and collecting products of the first gas-liquid condenser 6, the second gas-liquid condenser 7 and the third gas-liquid condenser 8 to obtain an aromatization product.
Example 8
The method for performing oil field associated gas aromatization integrated conversion by adopting the system of the embodiment 2 comprises the following steps:
(1) adjusting the temperatures of the first heating furnace 2, the second heating furnace 3 and the third heating furnace 4 to 300 ℃, 450 ℃ and 630 ℃ respectively, and adjusting the reaction pressures to 0.3 MPa;
(2) starting a cooling circulating pump 9, allowing associated gas to flow out of a raw material gas cylinder 1, sequentially passing through a first heating furnace 2, a first gas-liquid condenser 6, a second heating furnace 3, a second gas-liquid condenser 7, a third heating furnace 4 and a third gas-liquid condenser 8, and performing online analysis through a gas chromatograph 5; the space velocity of associated gas is 1800 mL/h.g; the first gas-liquid condenser 6, the second gas-liquid condenser 7 and the third gas-liquid condenser 8 are vertical; the height-diameter ratio of the catalyst bed layer is 5: 1; the cooling circulating pump 9 is a centrifugal pump; the catalysts in the first heating furnace 2, the second heating furnace 3 and the third heating furnace 4 respectively comprise modified components and carriers, the modified components of the catalysts in the first heating furnace 2 and the second heating furnace 3 are respectively Zn and Ga, the modified components of the catalysts in the third heating furnace 4 are Zn and Ga with the mass ratio of 1:1, the carriers are all hollow shell type small crystal grain ZSM-5 molecular sieves, and the loading capacity of the modified components is 1 wt%;
(3) and collecting products of the first gas-liquid condenser 6, the second gas-liquid condenser 7 and the third gas-liquid condenser 8 to obtain an aromatization product.
When the associated gas passes through the first heating furnace 2, the components above C4 in the raw material associated gas react under the catalytic action of the catalyst, enter the first gas-liquid condenser 6, exchange heat through a cooling medium in the first gas-liquid condenser, part of the substances in the mixed gas flow are condensed into liquid to be separated from the gas phase, the unreacted gas continuously enters the second heating furnace 3, the C3 component reacts under the catalytic action of the catalyst, the gas passes through the second gas-liquid condenser 7 and exchanges heat with the cooling medium in the second gas-liquid condenser, part of substances in the mixed gas flow are condensed into liquid and separated from the gas phase, unreacted gas continuously enters the third heating furnace 4, the C2 component reacts under the catalytic action of the catalyst, the C1 component (namely methane) does not react, the part of substances in the mixed gas flow are condensed into liquid and separated from the gas phase through the third gas-liquid condenser 8, and the unreacted gas is analyzed through a gas chromatography analyzer.
The reaction time, the conversion rate of the lower alkane of C2 or more, and the yield of the aromatic hydrocarbon of the above examples 3 to 8 are shown in Table 1, wherein the reaction time is the time of introducing the associated gas, and the proportion of the associated gas in the carrier gas is the same;
TABLE 1 results of the reaction
Claims (8)
1. An oil field associated gas aromatization integrated conversion system is characterized in that:
comprises a raw material gas cylinder (1), a first heating furnace (2), a first gas-liquid condenser (6), a second heating furnace (3), a second gas-liquid condenser (7), a third heating furnace (4), a third gas-liquid condenser (8) and a gas chromatograph (5) which are connected in sequence; also comprises a cooling circulation pump (9);
catalyst beds are arranged in the first heating furnace (2), the second heating furnace (3) and the third heating furnace (4);
the bin walls of the first gas-liquid condenser (6), the second gas-liquid condenser (7) and the third gas-liquid condenser (8) are all of sandwich structures, and cooling media are arranged in the sandwich layers;
the bin walls of the first gas-liquid condenser (6), the second gas-liquid condenser (7) and the third gas-liquid condenser (8) are sequentially connected with a cooling circulating pump (9) to form a circulating loop.
2. The integrated conversion system for oilfield associated gas aromatization according to claim 1, characterized in that: the first heating furnace (2), the second heating furnace (3) and the third heating furnace (4) are all vertical heating furnaces.
3. The integrated conversion system for oilfield associated gas aromatization according to claim 2, characterized in that: the height-diameter ratio of the catalyst bed layer is (2-5): 1.
4. the integrated conversion system for oilfield associated gas aromatization according to claim 1, characterized in that: the first gas-liquid condenser (6), the second gas-liquid condenser (7) and the third gas-liquid condenser (8) are vertical or horizontal.
5. The integrated conversion system for oilfield associated gas aromatization according to claim 1, characterized in that: the cooling circulating pump (9) is a centrifugal pump, a vortex pump or a plunger pump.
6. The integrated conversion method for oil field associated gas aromatization by adopting the system of claim 1 is characterized in that: the method comprises the following steps:
(1) the temperatures of the first heating furnace (2), the second heating furnace (3) and the third heating furnace (4) are respectively regulated to 360 ℃, 500 ℃ and 650 ℃, and the reaction pressures are regulated to 0.1-0.3 MPa;
(2) starting a cooling circulating pump (9), allowing associated gas to flow out of a raw material gas cylinder (1), sequentially pass through a first heating furnace (2), a first gas-liquid condenser (6), a second heating furnace (3), a second gas-liquid condenser (7), a third heating furnace (4) and a third gas-liquid condenser (8), and then performing online analysis through a gas chromatograph (5);
(3) collecting products of the first gas-liquid condenser (6), the second gas-liquid condenser (7) and the third gas-liquid condenser (8) to obtain an aromatization product;
the catalyst in the catalyst bed layer comprises modified components and carriers, the modified components of the catalysts in the first heating furnace (2) and the second heating furnace (3) are respectively Zn and Ga, the modified components of the catalyst in the third heating furnace (4) are Zn and Ga with the mass ratio of 1:1, the carriers are all hollow shell type small crystal grain ZSM-5 molecular sieves, and the loading capacity of the modified components is 1-2 wt%.
7. The integrated conversion method for oil field associated gas aromatization according to claim 6, characterized in that: the space velocity of the associated gas is 1600-2000 mL/h.g.
8. The integrated conversion method for oil field associated gas aromatization according to claim 6, characterized in that: the catalyst is prepared by the following method: ammonia exchange is carried out on the carrier hollow shell type small crystal grain ZSM-5 molecular sieve to obtain an H-type molecular sieve, and then the modified components are respectively loaded on the H-type molecular sieve by adopting an impregnation method.
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| CN214088342U (en) * | 2020-11-30 | 2021-08-31 | 陕西延长石油（集团）有限责任公司 | Oil field associated gas aromatization integrated conversion system |
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