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Method for hydroisomerizing normal alkane by using supported nickel phosphide catalyst

A technology for hydroisomerization and n-paraffin, which is applied in the field of hydrocarbon isomerization, can solve problems such as affecting large-scale application, reducing product yield, high cracking activity, etc., and achieves good application prospects, good selectivity and activity. high effect

Inactive Publication Date: 2013-01-23
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high cost of the former will affect its large-scale application, while the latter is only suitable for high-sulfur raw materials
In addition, nickel-based catalysts have lower product yields due to higher cracking activity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Example 1. Take a certain amount of SAPO-11 molecular sieve carrier and dry it at 110°C for 4 hours, and use Ni(NO 3 ) 2 and NH 4 h 2 PO 4 The mixed solution (where the Ni / P ratio is 1) impregnated the carrier for 12 hours, then dried at 110°C for 12 hours, and then calcined at 500°C for 4 hours in an air atmosphere to prepare the catalyst precursor. Put 1.0 g of this precursor in a quartz tube reactor, feed in hydrogen gas with a flow rate of 300 ml / min, first raise the temperature from room temperature to 250 °C at a rate of 5 °C / min, and then increase the temperature at a rate of 1 °C / min to 650 ° C, and after maintaining at 650 ° C for 3 hours, the SAPO-11 molecular sieve supported nickel phosphide catalyst was prepared. The catalyst was heated at room temperature with 0.5% O 2 / N 2 Air flow (100 ml / min) passivated for 6 hours before use. The prepared catalyst is SAPO-11 molecular sieve loaded Ni 2 P, the mass content of nickel in the catalyst is 3%.

[0008...

Embodiment 2

[0009] Embodiment 2. Catalyst preparation process is the same as embodiment 1, difference is the Ni(NO 3 ) 2 and NH 4 h 2 PO 4 The Ni / P ratio in the mixed impregnation solution is 3, and the prepared catalyst is SAPO-11 molecular sieve loaded Ni 3 P, the mass content of nickel in the catalyst is 3%. The hydroisomerization reaction conditions of the catalyst are the same as in Example 1. Calculated by mass, the conversion of n-dodecane was 97%, and the selectivity of isododecane was 61%.

Embodiment 3

[0010] Embodiment 3. Catalyst preparation process is the same as embodiment 1, difference is the Ni(NO 3 ) 2 and NH 4 h 2 PO 4 The Ni / P ratio in the mixed solution is 0.5, and the prepared catalyst is SAPO-11 molecular sieve loaded Ni 2 P, the mass content of nickel in the catalyst is 3%. The hydroisomerization reaction conditions of the catalyst are the same as in Example 1. Calculated by mass, the conversion of n-dodecane was 54%, and the selectivity of isododecane was 62%.

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Abstract

The invention discloses a method for hydroisomerizing normal alkane by using a supported nickel phosphide catalyst, which comprises the following steps: loading the supported nickel phosphide catalyst in a fixed bed type reactor, feeding hydrogen gas and the normal alkane according to a mol ratio of (1-20):1, and performing isomerization reaction under the reaction conditions that the reaction temperature is 250-400 DEG C, the hydrogen gas pressure is 0.1-5.0 MPa and the weight hourly space velocity of the normal alkane is 0.1-10 h<-1>, wherein the supported nickel phosphide catalyst takes SAPO-11 as a carrier; the active phase is nickel phosphide; and the mass of nickel accounts for 0.5-10% of the mass of the catalyst. The supported nickel phosphide catalyst used in the invention has the advantages of high activity, good selectivity, low cost, no need of vulcanizing agent and the like, and has favorable application prospects.

Description

technical field [0001] The invention relates to a method for hydroisomerization of normal alkanes with a supported nickel phosphide catalyst, belonging to the technical field of hydrocarbon isomerization. Background technique [0002] With the increasingly stringent requirements of environmental protection regulations, people's demand for products such as clean gasoline, diesel oil and lubricating oil continues to increase. Hydroisomerization is an important technology for the production of high-quality petroleum products. The use of hydroisomerization technology can increase the octane number of gasoline, reduce the freezing point or pour point of diesel oil and lubricating oil, and have a higher product yield. Hydroisomerization uses a metallic and acidic bifunctional catalyst. Among them, the metal component mainly includes noble metals (such as Pt, Pd) or metal sulfides (such as Ni-Co, Ni-W, Ni-Mo and other sulfides). The high cost of the former will affect its large...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C5/27C07C9/16B01J29/85
Inventor 陈吉祥田沙沙
Owner TIANJIN UNIV
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