Preparation method of Pentasil-type molecular sieve for preparing ethylene from ethanol
A technology for ethanol to ethylene and molecular sieves, applied in molecular sieve catalysts, chemical instruments and methods, and hydrocarbon production from oxygen-containing organic compounds, etc.
Active Publication Date: 2013-05-29
SOUTHWEST RES & DESIGN INST OF CHEM IND
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Problems solved by technology
From the above two inventions, although the use of molecular sieves as catalysts is superior to alumina catalysts, a large amount of diluent gas is still required, and the reaction temperature is still relatively high
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0018] In terms of molar ratio, first mix 0.017 parts of aluminum sulfate with 1.6 parts of n-butylamine and add 30 parts of deionized water, stir evenly to obtain slurry A; add 1 part of silica sol to slurry A while stirring, and stir Obtain gel B; continue to stir gel B at 25°C for 5 hours, then crystallize at 210°C for 12 hours; obtain catalyst semi-finished product C; dry catalyst semi-finished product C, roast and hydrogen type exchange, and finally crush, The 20-40 mesh particles are collected by sieving to obtain the required Pentasil molecular sieve catalyst.
[0019] Example 2:
Embodiment 2
[0021] Example 3:
Embodiment 3
[0023] Example 4:
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The invention belongs to the field of catalysts, and particularly relates to a preparation method of a Pentasil-type molecular sieve for preparing ethylene from ethanol. The silica-alumina ratio of the molecular sieve is 60-800. The preparation method comprises the following steps: 1, mixing an aluminum source and a template agent, and evenly stirring to obtain slurry A; 2, adding a silicon source and an organic additive into the slurry A while stirring, and stirring to obtain gel B; and 3, further stirring the gel B at 25-90 DEG C for 2-10 hours, and then crystallizing at 100-210 DEG C for 12-60 hours, wherein the mol ratio of Al2O3, SiO2, H2O, the template agent and the additive among the raw materials is (0.001-0.017):1:(10-30):(0.05-1.6):(0.2-8). The molecular sieve provided by the invention has the characteristics of high hydrothermal stability, adjustable silica-alumina ratio, high dispersivity and the like, can be used for ethylene preparation reaction based on dehydration of a low-concentration ethanol solution, and is low in reaction temperature and high in catalyst activity and selectivity.
Description
technical field [0001] The invention relates to a catalyst in the field of chemical industry, in particular to a method for preparing ethylene Pentasil molecular sieves from ethanol. [0002] Background technique [0003] Ethylene is an important petrochemical basic raw material, which can be used to produce a variety of important organic chemical raw materials. However, due to the shortage of oil supply, the rise of crude oil price and the environmental problems caused by the traditional oil route to produce ethylene, the non-traditional oil route to produce ethylene will have a great market prospect. The vigorous development of the bioethanol industry just caters to this need. At the same time, with the maturity of bioethanol technology, the cost of bioethanol continues to decrease, making the process of ethanol production of ethylene more economically advantageous. [0004] At present, the catalysts used in ethanol to ethylene are mainly modified alumina catalysts. The...
Claims
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IPC IPC(8): C01B39/36B01J29/40C07C11/04C07C1/24
CPCY02P20/52
Inventor 谭亚南何霖韩伟
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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