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Method for preparing high-purity C16 and C18 normal mono-alkane

A monoalkane, high-purity technology is applied in the field of preparing high-purity C16 and C18 normal monoalkanes, which can solve the problems of high cost of separating monoalkanes, high separation cost, high technical difficulty, etc., and achieves low production cost, high purity, Simple effect of process technology route

Active Publication Date: 2021-08-03
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the normal monoalkanes obtained from Fischer-Tropsch synthetic oil have the advantages of low aromatics content, no sulfur and nitrogen impurities, etc., due to the product distribution characteristics of Fischer-Tropsch synthesis, the content of each monoalkane is very low. The way to separate monoalkanes from Fischer-Tropsch synthesis products requires a large cost
Especially for long-chain n-alkanes, due to their high boiling point, they need to be separated under negative pressure, resulting in higher separation costs and greater technical difficulty

Method used

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  • Method for preparing high-purity C16 and C18 normal mono-alkane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Modified Al 2 o 3 Preparation of vector

[0037] (1) Dissolve a certain amount of zinc nitrate in deionized water, and load it on Al by impregnation method 2 o 3On the carrier, the loading amount is 1% based on ZnO, dried at 80°C for 12h, and calcined at 550°C for 6h;

[0038] (2) Carry out silicon modification treatment to the sample that step (1) obtains, use tetraethyl orthosilicate as silicon modifier, n-heptane as diluent, the proportioning of modifier and diluent is 9:1 , the sample was impregnated at 30°C for 12 hours, and then baked at 550°C for 6 hours to obtain modified Al 2 o 3 carrier.

[0039] (2) Preparation of hydrogenation catalyst:

[0040] (1) Upper layer catalyst: Ammonium molybdate and nickel nitrate are used as active metal precursors, dissolved in deionized water by complexation, and then the active metals are loaded on the modified Al by co-impregnation. 2 o 3 For the carrier, the content of active metal is calculated as oxide, the lo...

Embodiment 2

[0050] (1) Modified Al 2 o 3 Preparation of vector

[0051] (1) Dissolve a certain amount of magnesium nitrate in deionized water, and load it on Al by impregnation method 2 o 3 On the carrier, the loading amount is 1% based on MgO, dried at 120°C for 6h, and calcined at 550°C for 6h;

[0052] (2) Carry out silicon modification treatment to the sample obtained in step (1), use siloxane as silicon modifier, benzene as diluent, the ratio of modifier to diluent is 8:1, at 60 ℃ Immerse the sample for 3 hours, and then bake it again at 550°C for 6 hours to obtain modified Al 2 o 3 carrier.

[0053] (2) Preparation of hydrogenation catalyst:

[0054] The preparation method of hydrogenation catalyst in the present embodiment is identical with embodiment 1, and difference is only in:

[0055] (1) Upper layer catalyst: the active metal content is calculated as oxide, the loading of nickel oxide is 8%, and the loading of molybdenum oxide is 2%.

[0056] (2) Lower layer catalyst...

Embodiment 3

[0065] (1) Modified Al 2 o 3 Preparation of vector

[0066] (1) Dissolve a certain amount of magnesium nitrate and zinc nitrate in deionized water, and load them on Al by impregnation method 2 o 3 On the carrier, the loading amount is 0.5% as ZnO, 0.5% as MgO, dried at 100°C for 10h, and calcined at 550°C for 6h;

[0067] (2) Carry out silicon modification treatment to the sample that step (1) obtains, use tetraethyl orthosilicate as silicon modifier, cyclohexane as diluent, the proportioning of modifier and diluent is 7:1, The sample was impregnated at 100°C for 1h, and then baked at 550°C for 6h to obtain modified Al 2 o 3 carrier.

[0068] (2) Preparation of hydrogenation catalyst:

[0069] The preparation method of hydrogenation catalyst in the present embodiment is identical with embodiment 1, and difference is only in:

[0070] (1) Upper layer catalyst: the active metal content is calculated as oxide, the loading of nickel oxide is 5%, and the loading of molybden...

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Abstract

The invention discloses a method for preparing high-purity C16 and C18 normal mono-alkanes. The method is used for producing C16 and C18 high-purity mono-alkanes by using vegetable oil through a double-bed hydrodeoxygenation reaction in combination with a rectification separation process, and specifically comprises the following steps of introducing diluted vegetable oil into a double-bed fixed bed reactor filled with two catalysts through a pressure pump, and carrying out hydrodeoxygenation reaction in the presence of hydrogen to obtain a hydrocarbon mixture, enabling a hydrogenation product to be subjected to heat exchange through a heat exchanger and gas-liquid separation and then enter a rectification separation section, and separating high-purity C16 and C18 sequentially through two separation processes. A double-bed fixed bed hydrodeoxygenation technology is adopted, and the problems of large heat release amount and non-uniform bed temperature in the vegetable oil hydrodeoxygenation reaction process are solved by adjusting the reaction activity and the filling ratio of the catalysts of the upper and lower beds; the prepared target product is high in purity, the utilization value of vegetable oil can be remarkably improved, and the production cost of C16 and C18 long-chain normal mono-alkanes is reduced.

Description

technical field [0001] The invention relates to the technical field of catalysis, in particular to a method for preparing high-purity C16 and C18 normal monoalkanes. Background technique [0002] N-alkanes are widely used in daily chemical products, lubricating oil, nylon manufacturing, oil adhesives, ink coatings and other fields. At present, n-monoparaffins are mainly produced using petroleum as raw material, using urea dewaxing, molecular sieve adsorption and other technologies, combined with rectification to produce. However, when petroleum is used as raw material to separate normal alkanes, the product will inevitably contain impurities such as aromatics, cycloalkanes, sulfur, and nitrogen. In recent years, with the maturity of Fischer-Tropsch synthesis technology, the method of obtaining normal monoparaffins through distillation and separation using Fischer-Tropsch synthetic oil as raw material has also been greatly developed. Patent CN106699501A discloses a method f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/22C07C1/207C07C7/00C07C9/22B01J23/89
CPCC07C1/22C07C1/207B01J23/002B01J23/8993C07C7/005B01J2523/00C07C2523/89B01J2523/27B01J2523/31B01J2523/41B01J2523/68B01J2523/847B01J2523/22C07C9/22Y02P30/20
Inventor 李德宝张伟贾丽涛马中义
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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