CN113617382A - Isomeric pour point depressing catalyst for aviation kerosene and preparation method thereof - Google Patents

Isomeric pour point depressing catalyst for aviation kerosene and preparation method thereof Download PDF

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Publication number
CN113617382A
CN113617382A CN202111035606.5A CN202111035606A CN113617382A CN 113617382 A CN113617382 A CN 113617382A CN 202111035606 A CN202111035606 A CN 202111035606A CN 113617382 A CN113617382 A CN 113617382A
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China
Prior art keywords
catalyst
pour point
molecular sieve
aviation kerosene
crystallization
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CN202111035606.5A
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Chinese (zh)
Inventor
陈彦霖
凌宇鑫
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Jiangxi Baliusan Industrial Co ltd
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Jiangxi Baliusan Industrial Co ltd
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Priority to CN202111035606.5A priority Critical patent/CN113617382A/en
Publication of CN113617382A publication Critical patent/CN113617382A/en
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    • 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
    • B01J29/00—Catalysts comprising molecular sieves
    • B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/40—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively
    • B01J29/48—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively containing arsenic, antimony, bismuth, vanadium, niobium tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G45/00—Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds
    • C10G45/58—Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds to change the structural skeleton of some of the hydrocarbon content without cracking the other hydrocarbons present, e.g. lowering pour point; Selective hydrocracking of normal paraffins
    • C10G45/60—Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds to change the structural skeleton of some of the hydrocarbon content without cracking the other hydrocarbons present, e.g. lowering pour point; Selective hydrocracking of normal paraffins characterised by the catalyst used
    • C10G45/64—Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds to change the structural skeleton of some of the hydrocarbon content without cracking the other hydrocarbons present, e.g. lowering pour point; Selective hydrocracking of normal paraffins characterised by the catalyst used containing crystalline alumino-silicates, e.g. molecular sieves
    • 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
    • B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
    • B01J2229/10—After treatment, characterised by the effect to be obtained
    • B01J2229/18—After treatment, characterised by the effect to be obtained to introduce other elements into or onto the molecular sieve itself
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
    • C10G2300/20—Characteristics of the feedstock or the products
    • C10G2300/30—Physical properties of feedstocks or products
    • C10G2300/304—Pour point, cloud point, cold flow properties

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  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Materials Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Catalysts (AREA)

Abstract

The invention provides an isomeric pour point depressing catalyst for aviation kerosene and a preparation method thereof, and relates to the field of pour point depressing catalysts. The heterogeneous pour point depression catalyst for aviation kerosene comprises a carrier and active metal loaded on the carrier, wherein the carrier is a modified ZSM-5 molecular sieve, and the active metal is one or more of noble metal Au, Pt, Pd, Ru and Ir and non-noble metal Ni and Cu; the preparation method of the catalyst comprises the following specific preparation steps: s1, adding a modified ZSM-5 molecular sieve into a container, then adding a solvent, and fully stirring to form stable gel; s2, adding the active metal aqueous solution into the mixed solution, and fully stirring to uniformly mix the active metal aqueous solution and the mixed solution; s3, feeding the mixture into a crystallization reaction kettle for crystallization; and S4, after crystallization is finished, drying, roasting and molding the product, and standing and cooling the product to obtain the catalyst. The heterogeneous pour point depressing catalyst can lower the pour point of aviation kerosene and raise quality, and the catalyst is simple in processing and low in cost.

Description

Isomeric pour point depressing catalyst for aviation kerosene and preparation method thereof
Technical Field
The invention relates to the technical field of pour point depressing catalysts, in particular to an isomeric pour point depressing catalyst for aviation kerosene and a preparation method thereof.
Background
Aviation kerosene is one of petroleum products and is also known as odorless kerosene. The aviation kerosene mainly comprises hydrocarbon compounds with different fractions, has proper density, high heat value, good combustion performance, rapid, stable, continuous and complete combustion, small combustion area, less carbon deposition and difficult coking; the low-temperature fluidity is good, and the requirements of cold low-temperature areas and high-altitude flight on the fluidity of oil products can be met; the thermal stability and the anti-oxidation stability are good, and the requirement of supersonic high-altitude flight can be met; high cleanliness, no harmful substances such as mechanical impurities and water, low sulfur content, especially low mercaptan sulfur content, and less corrosion to machine parts. The aviation kerosene adopts a one-pass partial conversion process, a cogel type catalyst is adopted in the processing process, the catalyst is filled in a large amount, the content of a molecular sieve is low, the aromatic hydrocarbon saturation capacity is high, and the oil product has the characteristics of high density, high smoke point, high heat value and low aromatic hydrocarbon.
In the process of producing the aviation kerosene, the hydrogenated liquid oxygen-containing organic compound is subjected to hydrodeoxygenation by adopting a metal-molecular sieve catalyst to obtain the biomass aviation kerosene or high-quality diesel oil with the carbon chain length of 6-11.
In the existing catalyst, a ZSM-22 molecular sieve is usually selected as a molecular sieve main body in the metal-molecular sieve catalyst, and the ZSM-22 molecular sieve has a strong acid center, good hydrothermal stability and unique shape selectivity and shows excellent catalytic performance in long-chain alkane isomerization reaction. However, the active sites of the molecular sieve at the pore openings are more acidic, so that the catalyst based on the molecular sieve has stronger cracking activity; and the one-dimensional ten-membered ring channel structure has larger diffusion limitation, so that the isomeric products are mainly single-branch paraffin, and the multi-branch paraffin has lower condensation point and better low-temperature fluidity. Therefore, the effect of the catalyst is more general, and therefore, an isomeric pour point depressing catalyst for aviation kerosene needs to be designed.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides an isomeric pour point depressing catalyst for aviation kerosene and a preparation method thereof, and solves the problems that the existing metal-molecular sieve catalyst for aviation kerosene has a common pour point depressing effect and is relatively complex to prepare.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: the catalyst comprises a carrier and active metal loaded on the carrier, wherein the carrier is a molecular sieve.
Preferably, the modified molecular sieve is a modified ZSM-5 molecular sieve.
Preferably, the preparation method of the modified ZSM-5 molecular sieve is as follows:
a. pouring the modifier solution into a container, adding a certain amount of distilled water for dilution, fully and uniformly stirring, and adding ZSM-5 molecular sieve raw powder under stirring;
b. slowly dropwise adding a dilute ammonia solution by using a dropping funnel to adjust the pH value to be 3, continuously stirring for 5-10 min to keep the pH value of the solution constant, precipitating for 3h, and steaming the solution until the solution is nearly dry;
c. and then putting the modified ZSM-5 molecular sieve into an oven to be dried for 12h at 105 ℃, and roasting the dried product for 3h at 600 ℃ in a muffle furnace to obtain the modified ZSM-5 molecular sieve.
Preferably, the modifier in the step a is ZrO2、WO3、B203、P2O5Mixture of solutions, and ZrO2、WO3、B203、P2O5Respectively accounting for 1%, 3% and 3% of the ZSM-5 molecular sieve raw powder by mass, wherein the volume ratio of the distilled water to the modifier is 3: 1.
preferably, the active metal is one or more of noble metals Au, Pt, Pd, Ru and Ir and non-noble metals Ni and Cu, and the mass ratio of the solvent to the molecular sieve is 1: 1.5.
preferably, the mass percentage of the active metal in the catalyst is 5% -10%.
Preferably, the preparation method of the isomeric pour point depressing catalyst for aviation kerosene comprises the following specific preparation steps:
s1, adding a modified ZSM-5 molecular sieve into a container, then adding a solvent, and fully stirring to form stable gel;
s2, adding the active metal aqueous solution into the mixed solution, and fully stirring to uniformly mix the active metal aqueous solution and the mixed solution;
s3, feeding the mixture into a crystallization reaction kettle for crystallization;
s4, after crystallization is completed, drying, roasting, ammonium exchange, forming and drying roasting are carried out on the product, and the catalyst is obtained.
Preferably, the solvent is one or more of water, methanol, ethanol, tetrahydrofuran and cyclohexane, and the mass ratio of the solvent to the molecular sieve is 1: 1.5.
preferably, the crystallization temperature of the crystallization reaction kettle in the S3 is 120-200 ℃, and the crystallization time is 12-72 h.
Preferably, the drying temperature in S4 is between 100 and 240 ℃, the drying time is 12-14h, the roasting temperature is 300 and 400 ℃, and the roasting time is 1-8 h.
(III) advantageous effects
The invention provides an isomeric pour point depressing catalyst for aviation kerosene and a preparation method thereof. The method has the following beneficial effects:
the isomerization pour point depressing catalyst designed by the invention adopts the modified ZSM-5 molecular sieve as the carrier structure of the catalyst, and the ZSM-5 molecular sieve is subjected to composite modification by Zr, W, B and P, so that the acid catalysis performance and the acid stability of the catalyst are greatly improved, the acidity of the catalyst is uniformly distributed, and the catalyst formed by combining the modified molecular sieve and metal has excellent stability and pour point depressing effect.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
the embodiment of the invention provides a preparation method of an isomeric pour point depressing catalyst for aviation kerosene, which comprises the following specific preparation steps:
s1, adding a modified ZSM-5 molecular sieve into a container, adding a solvent ethanol, and fully stirring to form stable gel;
s2, adding an aqueous solution of active metals Au, Pt and Ni into the mixed solution, wherein the mass percentage of Au, Pt and Ni in the catalyst is 8%, and fully stirring to uniformly mix the Au, Pt and Ni;
s3, feeding the mixture into a crystallization reaction kettle for crystallization, wherein the crystallization temperature is 150 ℃, and the crystallization time is 36 hours;
s4, after crystallization is finished, drying the product in a drying chamber at 140 ℃ for 12h, then roasting the product for 4h in an environment at 340 ℃, and standing and cooling the product after forming to obtain the catalyst.
Example two:
the embodiment of the invention provides a preparation method of an isomeric pour point depressing catalyst for aviation kerosene, which comprises the following specific preparation steps:
s1, adding a modified ZSM-5 molecular sieve into a container, adding solvent water, methanol and ethanol, and fully stirring to form stable gel;
s2, adding an aqueous solution of active metals Pd, Ru and Ir into the mixed solution, wherein the mass percent of Pd, Ru and Ir in the catalyst is 6%, and fully stirring to uniformly mix the Pd, Ru and Ir;
s3, feeding the mixture into a crystallization reaction kettle for crystallization, wherein the crystallization temperature is 150 ℃, and the crystallization time is 36 hours;
s4, after crystallization is finished, drying the product in a drying chamber at 140 ℃ for 13h, then roasting the product at 340 ℃ for 6h, and after forming, standing and cooling to obtain the catalyst.
Example three:
the embodiment of the invention provides a preparation method of an isomeric pour point depressing catalyst for aviation kerosene, which comprises the following specific preparation steps:
s1, adding a modified ZSM-5 molecular sieve into a container, adding a solvent ethanol, and fully stirring to form stable gel;
s2, adding an aqueous solution of active metals Au, Cu and Ni into the mixed solution, wherein the mass percentage of Au, Cu and Ni in the catalyst is 10%, and fully stirring to uniformly mix the Au, Cu and Ni;
s3, feeding the mixture into a crystallization reaction kettle for crystallization, wherein the crystallization temperature is 150 ℃, and the crystallization time is 40 hours;
s4, after crystallization is finished, drying the product in a drying chamber at 180 ℃ for 14h, then roasting the product at 350 ℃ for 4h, and after forming, standing and cooling to obtain the catalyst.
Example four:
the embodiment of the invention provides a preparation method of an isomeric pour point depressing catalyst for aviation kerosene, which comprises the following specific preparation steps:
s1, adding a modified ZSM-5 molecular sieve into a container, adding a solvent ethanol, and fully stirring to form stable gel;
s2, adding an aqueous solution of active metals Pt, Pd, Ru and Ni into the mixed solution, wherein the mass percentage of the Pt, Pd, Ru and Ni in the catalyst is 8%, and fully stirring to uniformly mix the Pt, Pd, Ru and Ni;
s3, feeding the mixture into a crystallization reaction kettle for crystallization, wherein the crystallization temperature is 150 ℃, and the crystallization time is 36 hours;
s4, after crystallization is finished, drying the product in a drying chamber at 140 ℃ for 12h, then roasting the product for 4h in an environment at 340 ℃, and standing and cooling the product after forming to obtain the catalyst.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. An isomeric pour point depressing catalyst for aviation kerosene, characterized in that: the catalyst comprises a carrier and active metal loaded on the carrier, wherein the carrier is a modified molecular sieve.
2. The isomeric pour point depressant catalyst for aviation kerosene according to claim 1, wherein: the modified molecular sieve is a modified ZSM-5 molecular sieve.
3. The isomeric pour point depressant catalyst for aviation kerosene according to claim 1, wherein: the preparation method of the modified ZSM-5 molecular sieve comprises the following steps:
a. pouring the modifier solution into a container, adding a certain amount of distilled water for dilution, fully and uniformly stirring, and adding ZSM-5 molecular sieve raw powder under stirring;
b. slowly dropwise adding a dilute ammonia solution by using a dropping funnel to adjust the pH value to be 3, continuously stirring for 5-10 min to keep the pH value of the solution constant, precipitating for 3h, and steaming the solution until the solution is nearly dry;
c. and then putting the modified ZSM-5 molecular sieve into an oven to be dried for 12h at 105 ℃, and roasting the dried product for 3h at 600 ℃ in a muffle furnace to obtain the modified ZSM-5 molecular sieve.
4. The isomeric pour point depressant catalyst for aviation kerosene according to claim 3, wherein: the modifier in the step a is ZrO2、WO3、B203、P2O5Mixture of solutions, and ZrO2、WO3、B203、P2O5Respectively accounting for 1%, 3% and 3% of the ZSM-5 molecular sieve raw powder by mass, wherein the volume ratio of the distilled water to the modifier is 3: 1.
5. the isomeric pour point depressant catalyst for aviation kerosene according to claim 1, wherein: the active metal is one or more of noble metals Au, Pt, Pd, Ru and Ir and non-noble metals Ni and Cu.
6. The isomeric pour point depressant catalyst for aviation kerosene according to claim 1, wherein: the mass percentage of the active metal in the catalyst is 5-10%.
7. The preparation method of the isomeric pour point depressing catalyst for aviation kerosene is characterized by comprising the following steps: the method comprises the following specific preparation steps:
s1, adding a modified ZSM-5 molecular sieve into a container, then adding a solvent, and fully stirring to form stable gel;
s2, adding the active metal aqueous solution into the mixed solution, and fully stirring to uniformly mix the active metal aqueous solution and the mixed solution;
s3, feeding the mixture into a crystallization reaction kettle for crystallization;
s4, after crystallization is completed, drying, roasting, ammonium exchange, forming and drying roasting are carried out on the product, and the catalyst is obtained.
8. The method for preparing an isomeric pour point depressant catalyst for aviation kerosene according to claim 7, wherein: the solvent is one or more than two of water, methanol, ethanol, tetrahydrofuran and cyclohexane, and the mass ratio of the solvent to the molecular sieve is 1: 1.5.
9. the method for preparing an isomeric pour point depressant catalyst for aviation kerosene according to claim 7, wherein: the crystallization temperature of the crystallization reaction kettle in the S3 is 120-200 ℃, and the crystallization time is 12-72 h.
10. The isomeric pour point depressing catalyst for aviation kerosene and the preparation method thereof according to claim 7, wherein: the drying temperature in the S4 is between 100 and 240 ℃, the drying time is 12-14h, the roasting temperature is 300 and 400 ℃, and the roasting time is 1-8 h.
CN202111035606.5A 2021-09-05 2021-09-05 Isomeric pour point depressing catalyst for aviation kerosene and preparation method thereof Pending CN113617382A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115041224A (en) * 2022-05-20 2022-09-13 大连理工大学 Synthesis of Cu-ZSM-35 molecular sieve and preparation method and application of biological aviation kerosene catalyst by biological grease one-step method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115041224A (en) * 2022-05-20 2022-09-13 大连理工大学 Synthesis of Cu-ZSM-35 molecular sieve and preparation method and application of biological aviation kerosene catalyst by biological grease one-step method
CN115041224B (en) * 2022-05-20 2023-07-14 大连理工大学 Preparation method and application of Cu-ZSM-35 molecular sieve synthesis and bio-oil one-step method for preparing bio-aviation kerosene catalyst

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