Method for promoting transformation of propane for preparing aromatic hydrocarbon

A technology for propane and aromatic hydrocarbons, applied in the field of promoting the conversion of propane to aromatic hydrocarbons, can solve problems such as low conversion rate of propane

Inactive Publication Date: 2014-04-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The cracking of propane is also a strong endothermic process. When the process of cracking propane and methanol to hydrocarbons is carried out in one system, when a certain raw material ratio is met, the reaction heat efficiency of the system can be approximately zero, but the conversion rate of propane is low , where the chemical influence of methanol on propane is not mentioned (Gao Zhixian et al., Research on the Coupling Conversion Process of Methanol / Propane on ZSM-5 Molecular Sieve, Journal of Fuel Chemistry, 1995, Volume 23, Issue 4: 390-395)

Method used

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  • Method for promoting transformation of propane for preparing aromatic hydrocarbon
  • Method for promoting transformation of propane for preparing aromatic hydrocarbon
  • Method for promoting transformation of propane for preparing aromatic hydrocarbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Preparation of Metal Supported Catalysts

[0051] The HZSM-5 / 11 / 22 / 23 (Si / Al=20-100) molecular sieve catalyst used in the experiment was purchased from Nankai University Catalyst Factory.

[0052] Weigh 100.00 g (dry basis) of the molecular sieve carrier, add a certain concentration of metal salt solution, and then add a certain amount of 25-28% ammonia water, and stir until it becomes a paste. Dry at 120°C for 6 hours, then increase the temperature at a rate of 5°C / min to 550°C and bake for 5 hours, cool to room temperature and grind to powder, bake at 350°C for 2 hours, after cooling, go through tableting, grinding, Sieve, and keep catalyst particles of 60 mesh to 80 mesh for future use.

[0053] Table 1 shows the relationship between the number of the obtained catalyst sample and the molecular sieve carrier used, the metal salt solution, the amount of 25-28% ammonia water added, and the mass percentage of the metal supported on the catalyst. Preparation of 2% Mo / HZ...

Embodiment 2

[0063] Methanol as a promoter mixed with propane on various catalysts for pulse reaction experiments

[0064] Load 32mg of catalyst into a quartz tube with an inner diameter of 3mm, heat to 550°C in the flow of activated gas (nitrogen, hydrogen, methane or a mixture of any of several) and maintain it for 30 minutes in this state, Complete the catalyst activation process. Then the feed gas of 1ml under normal pressure is passed through catalyzer, and the contact time of feed gas and catalyzer is 80ms, and feed gas proportioning is: propane / methanol=70 (propane and promotor contain carbon number ratio), and its specific composition is : Propane 70%, methanol (steam) 3%, helium 27%, above-mentioned percentages are mole percentages. The reacted product enters the chromatogram for analysis, and its analysis conditions are as in Comparative Example 1, and the results are shown in Table 2 (the aromatic products are benzene, toluene, xylene, ethylbenzene, mesitylene, methylethylbenze...

Embodiment 3

[0069] Various accelerators mixed with propane for impulse reaction experiment on HZSM-5

[0070] Put 32 mg of HZSM-5 catalyst into a quartz tube with an inner diameter of 3 mm, heat to 550° C. in an activation gas (nitrogen) flow and keep it there for 30 minutes to complete the catalyst activation process. Then the feed gas of 1ml under normal pressure is passed through catalyzer, and the contact time of feed gas and catalyzer is 80ms, and feed gas proportioning is: propane / promotor=70 (propane and promotor contain carbon number ratio), above-mentioned percentage The contents are in mole percent. The reacted product enters the chromatogram for analysis, and the analysis conditions are as in Comparative Example 1, and the results are shown in Table 3.

[0071] Table 3: Pulse reaction experiment of various accelerators mixed with propane on HZSM-5

[0072] Accelerator

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Abstract

The invention discloses a method for promoting transformation of propane for preparing aromatic hydrocarbon. Through a method for adding an accelerant into raw materials, the transformation ratio and reaction speed of propane is increased. The accelerant is any one or a mixture of methanol, dimethyl ether, ethanol, methyl chloride, methyl iodide, methylbenzene and dimethyl benzene; in a mixed material of propane and the accelerant, the carbon atom ratio of the propane to the accelerate is 10-500; and a molecular sieve catalyst is any one or a mixture of HZSM-5, HZSM-11, HZSM-22, HZSM-23, HY and HBeta.

Description

technical field [0001] The invention relates to a method for promoting the conversion of propane to produce aromatics. Background technique [0002] The raw materials of current chemical production rely heavily on petroleum, while petroleum and coal resources are decreasing day by day; the demand for aromatics as liquid fuels, solvents, and chemical raw materials is increasing day by day. At the same time, the reserves of low-carbon alkanes represented by natural gas are very large on the earth, but due to the relatively stable structure and properties of low-carbon alkanes, there are few breakthroughs in direct conversion. If the conversion of low-carbon alkanes can be improved in some way, in Resources, energy, technology and economy have very important strategic significance. [0003] Most of the low-carbon alkanes have been used as fuel for a long time, and propane is the by-product of natural gas processing and petrochemical processes, and the main component of liquefi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/04C07C15/06C07C15/073C07C15/08C07C15/107C07C2/76B01J29/44B01J29/46B01J29/48
CPCY02P20/52
Inventor 周游魏迎旭刘中民常福祥孙新德张莹李金哲陈景润
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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