A kind of sapo-18 molecular sieve and its synthetic method and a kind of method of methanol to olefin

A technology of SAPO-18 and synthesis method, which is applied in the direction of molecular sieve and alkali-exchanged phosphate, molecular sieve characteristic silicoaluminophosphate, etc., can solve the problems of unsatisfactory catalyst service life, increase production cost, reduce production efficiency, etc., and achieve shortening water consumption. Thermal crystallization time, increase production efficiency, and prolong the effect of one-way service life

Active Publication Date: 2018-04-13
CHNA ENERGY INVESTMENT CORP LTD +1
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Problems solved by technology

However, when SAPO-34 molecular sieve is used in the reaction of methanol to light olefins, the single-pass service life of the catalyst is not ideal, and the regeneration cycle is short. On the one hand, the production efficiency is reduced, and on the other hand, the production cost is increased.

Method used

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  • A kind of sapo-18 molecular sieve and its synthetic method and a kind of method of methanol to olefin
  • A kind of sapo-18 molecular sieve and its synthetic method and a kind of method of methanol to olefin
  • A kind of sapo-18 molecular sieve and its synthetic method and a kind of method of methanol to olefin

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[0024] According to the first aspect of the present invention, the present invention provides a kind of synthetic method of SAPO-18 molecular sieve, and this method comprises the following steps:

[0025] (1) provide a kind of mixed solution, described mixed solution contains aluminum source, phosphorus source, silicon source, templating agent and water;

[0026] (2) aging the mixed solution;

[0027] (3) hydrothermal crystallization of the aged mixed solution;

[0028] (4) The mixture obtained by hydrothermal crystallization is subjected to solid-liquid separation, and the obtained solid phase is dried and optionally calcined.

[0029] According to the method of the present invention, the template is a composite template, comprising a first template and a second template, the first template is N,N-diisopropylamine, and the second template is At least one of triethylamine, diethylamine and isopropylamine, and the molar ratio of the first templating agent to the second templa...

Embodiment 1

[0052] 13.15g pseudo-boehmite and 29.76g deionized water are mixed and stirred, and a mixed solution of 16.60g phosphoric acid (concentration is 85wt%) and 14.88g deionized water is added with vigorous stirring, and 7.20g silica sol (SiO 2 Content is the mixed solution of 40wt%) and 14.88g deionized water. After stirring at room temperature for 1 hour, add 10.32g N,N-diisopropylethylamine (99wt%) and 8.09g triethylamine, stir for 2 hours, and age the formed jelly at room temperature (25°C) for 2 hours . The aged mixed solution was put into a stainless steel crystallization kettle, and hydrothermally crystallized at 180° C. for 96 hours. The mixture obtained by hydrothermal crystallization was filtered, and the obtained solid phase was washed with deionized water, dried at 120° C. for 5 hours, and then calcined at 650° C. for 8 hours in an air atmosphere. The obtained molecular sieve is carried out X-ray diffraction analysis (results such as figure 1 Shown), confirmed to be ...

Embodiment 2

[0054] The molecular sieve was prepared by the same method as in Example 1, except that the amount of N,N-diisopropylethylamine (99 wt%) was 18.61 g, and the amount of triethylamine was 1.62 g. The obtained molecular sieve is carried out X-ray diffraction analysis (results such as figure 1 Shown), confirmed to be SAPO-18 molecular sieve. The molecular sieve yields and relative crystallinity are listed in Table 1.

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Abstract

The invention discloses a method for synthesizing SAPO-18 molecular sieves. The method uses a composite template agent, and N,N-diisopropylethylamine and at least one selected from triethylamine, diethylamine and isopropylamine The template agent is used in combination to shorten the hydrothermal crystallization time and increase the yield of molecular sieves. The SAPO-18 molecular sieve provided by the present invention has regular appearance and high crystallinity. The present invention also provides a method for producing olefins from methanol. The method uses the SAPO-18 molecular sieve provided by the present invention as a catalyst, which has high selectivity for low-carbon olefins and a long service life of the catalyst in one pass.

Description

technical field [0001] The invention relates to a SAPO-18 molecular sieve and a synthesis method thereof, and also relates to a method for producing olefins from methanol. Background technique [0002] Low carbon olefins (C 2 -C 4 Olefins), especially ethylene and propylene are important basic organic chemical raw materials. With the development of the chemical industry, the demand for low-carbon olefins is increasing day by day. At present, the main production route of light olefins is still by catalytic cracking / cracking reaction of naphtha or light oil from petroleum. However, as the shortage of oil resources in the world is becoming more and more serious, researchers are paying more and more attention to the technology of producing low-carbon olefins from non-petroleum resources, and the methanol-to-olefins technology has emerged as the times require. [0003] The methanol-to-olefins technology uses coal or natural gas as a raw material to produce synthesis gas, from...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/54C01B37/08
Inventor 郭磊朱伟平李飞薛云鹏孙先勇孙琦
Owner CHNA ENERGY INVESTMENT CORP LTD
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