Method for preparing hydrocarbon from higher aliphatic ester by metal phosphide catalyst

A technology of metal phosphide and higher fatty acid, applied in the field of hydrocarbon production, can solve the problems that precious metals affect large-scale application, increase investment and operating costs, and affect diesel quality, etc., and achieve the effects of good application prospects, low cost, and high activity.

Inactive Publication Date: 2012-07-18
TIANJIN UNIV
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

However, the sulfur content in vegetable oils is very low. When using sulfide catalysts, it is necessary to add a sulfide agent to the raw material to maintain the sulfide state of the catalyst to inhibit its

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0009] Example 1. A certain amount of carrier SiO 2 Dry at 110℃ for 4 hours, using Ni(NO 3 ) 2 And NH 4 H 2 PO 4 Mixed solution impregnated SiO 2 The carrier is 12 hours, then dried at 110°C for 12 hours, and then calcined in an air atmosphere at 500°C for 4 hours to prepare a catalyst precursor. Place 1.5 g of the precursor in a quartz tube reactor, and introduce hydrogen at a flow rate of 320 ml / min. The temperature is raised from room temperature to 250°C at a rate of 5°C / min, and then at a rate of 1°C / min. 650℃, and maintain at 650℃ for 3 hours to prepare SiO 2 Support nickel phosphide catalyst, the catalyst uses 0.5% O at room temperature 2 / N 2 Air flow (100 ml / min) is passivated for 6 hours and then used. XRD test results show that the prepared catalyst is SiO 2 Load Ni 2 P, the mass content of nickel and phosphorus in the catalyst are 13.4% and 3.9%, respectively.

[0010] With methyl dodecanoate as the reactant, the performance evaluation process of the catalyst's deoxyg...

Example Embodiment

[0011] Example 2. The catalyst preparation process is the same as in Example 1, except that the catalyst prepared is SiO 2 Load Ni 3 P, the mass content of nickel and phosphorus in the catalyst are 14.1% and 2.1%, respectively. The reaction performance evaluation and product analysis of the catalyst are the same as in Example 1, except that the reaction temperature is 340 o C. Calculated by mass, the conversion rate of methyl dodecanoate was 98.5%, and the total selectivity of the products C11 and C12 hydrocarbons was 70.5%.

Example Embodiment

[0012] Example 3. The catalyst preparation process is the same as that of Example 1, except that the prepared SiO 2 Load Ni 2 The mass content of Ni and P in the P catalyst are 3% and 1%, respectively. The reaction performance evaluation and product analysis of the catalyst are the same as in Example 1, except that the reaction temperature is 360 o C. Calculated by mass, the conversion rate of methyl dodecanoate was 97.5%, and the total selectivity of the product C11 and C12 hydrocarbons was 73.2%.

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Abstract

The invention discloses a method for preparing hydrocarbon from higher aliphatic ester by taking metal phosphide as a catalyst. The method comprises the following steps: filling the metal phosphide catalyst in a fixed bed reactor; feeding in the molar ratio of hydrogen to higher aliphatic ester of (10-500):1; under the conditions that the temperature is 250-450DEG C and H2 pressure is 0.1-8.0MPa and the weight hourly space velocity of higher aliphatic ester is 0.1-15h<-1>, generating hydrocarbon, wherein the metal phosphide catalyst takes silicon dioxide, aluminum oxide, HY molecular sieve, HZSM-5 molecular sieve, titanium dioxide-aluminum oxide composite oxide or cerium oxide-aluminum oxide composite oxide as a carrier, the active phase of hydrocarbon is phosphide of Ni, Co, Fe, Mo, W, Ni-Co, Ni-Fe, Ni-MO, Ni-W or Co-Mo, and the mass of the metal element and the mass of the phosphorus element respectively account for 30-40wt% and 1-15% of that of the catalyst. According to the invention, the adopted metal phosphide catalyst has the advantages of high activity, low cost, good application prospect and the like and does not need to use a vulcanizing agent.

Description

technical field [0001] The invention relates to a method for deoxygenating hydrocarbons from higher fatty acid esters with metal phosphide catalysts, and belongs to the technical field of hydrocarbon production. Background technique [0002] With the increasing shortage of fossil resources such as oil, natural gas and coal, the development and utilization of renewable resources has attracted worldwide attention. Biomass is the only renewable energy source that can be converted into carbon-containing liquid fuels. Biodiesel produced from animal and vegetable oils has become an important substitute for petroleum. The main components of animal and vegetable oils and fats are saturated or unsaturated triglycerides. Fatty acid methyl esters produced by transesterification are called first-generation biodiesel, and those obtained through hydrodeoxygenation and isomerization are similar to petroleum-based diesel components. Alkanes are called second-generation biodiesel. Compare...

Claims

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Application Information

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IPC IPC(8): C10G3/00
CPCY02P30/20
Inventor 陈吉祥李克伦李莉石恒
Owner TIANJIN UNIV
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