Method for removing olefin in aromatic hydrocarbon by M-SBA-15 type mesoporous molecular sieve

A M-SBA-15, mesoporous molecular sieve technology, applied in the direction of chemical change purification/separation, organic chemistry, etc., can solve the problems of weak surface acidity, hinder petrochemical applications, etc., achieve small environmental impact, avoid frequent reactions and regenerations The effect of switching operation and simple process flow

Active Publication Date: 2013-03-27
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the weak surface acidity of this mesoporous molec

Method used

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  • Method for removing olefin in aromatic hydrocarbon by M-SBA-15 type mesoporous molecular sieve
  • Method for removing olefin in aromatic hydrocarbon by M-SBA-15 type mesoporous molecular sieve
  • Method for removing olefin in aromatic hydrocarbon by M-SBA-15 type mesoporous molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Synthesis of Al-SBA-15 Molecular Sieve Catalyst

[0030] According to the molar ratio of raw materials P123:Al 2 o 3 :SiO2 2 :HCl:H 2O is calculated as 1:3.1:62.5:300:10000, weigh 20 grams of P123, mix with the calculated amount of distilled water and hydrochloric acid, stir and mix at 40°C for 1.0 hour, add 1.3 grams of monohydrate alumina and continue to stir and mix for 1.0 hour Then, add 45.0 grams of tetraethyl orthosilicate and continue stirring and mixing for 5.0 hours; crystallization reaction at 100°C and autogenous pressure for 48 hours, filter, wash, dry at 120°C for 5 hours, and roast at 550°C for 5.0 hours to remove The template agent was removed to obtain 13.5 grams of Al-SBA-15 molecular sieve catalyst powder, which was extruded and crushed to obtain 20-40 mesh catalyst particles, which were designated as CAT-1.

Embodiment 2～21

[0032] Using the same synthesis method as in Example 1, the difference is that the three-block polymer P123 is used as a template, and butyl titanate, cobalt nitrate, zinc nitrate, gallium nitrate, manganese nitrate, strontium nitrate, zirconium nitrate, nitric acid Calcium, magnesium acetate, iron nitrate, nickel nitrate, vanadium nitrate, chromium nitrate, germanium nitrate, tin nitrate, molybdenum nitrate, niobic acid, copper nitrate, tungstic acid, boric acid as precursors of the substituting element M, according to P123:MO n / 2 :SiO2 2 :HCl:H 2 O is 1:6.25:62.5:300:10000 molar ratio of raw materials to synthesize M-SBA-15 molecular sieve powder containing substituting elements. After extruding and crushing, 20-40 mesh catalyst particles are obtained, which are listed in Table 1.

[0033] Table 1

[0034]

Embodiment 22～36

[0036] Carry out loading modification to the Al-SBA-15 type molecular sieve catalyst of embodiment 1 and prepare composite solid acid catalyst

[0037] The 20-40 mesh Al-SBA-15 molecular sieve particles prepared in Example 1 are used in the following (1)-(14) operations for preparing supported catalysts:

[0038] (1) 10 grams of the Al-SBA-15 molecular sieve obtained in Example 1 was impregnated at room temperature for 24 hours with 100 milliliters of phosphoric acid aqueous solution with a concentration of 0.143 mol / L, followed by drying at 110°C for 3 hours and calcination at 400°C3 hours, get P 2 o 5 The P / Al-SBA-15 composite solid acid catalyst with a loading of 10.0wt% is referred to as CAT-22 catalyst (Example 22).

[0039] (2) Dissolve 5.0 grams of boric acid in 30 grams of acetone solvent, dissolve evenly, add the above-mentioned Al-SBA-15 molecular sieve, stir at room temperature for 15 minutes, heat to evaporate the acetone, and dry at 120°C for 3 hours to obtain t...

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Abstract

The invention discloses a method for removing olefin in aromatic hydrocarbon by an M-SBA-15 type mesoporous molecular sieve. The method comprises the step of carrying out contact reaction of aromatic hydrocarbon with a solid acid catalyst to obtain aromatic hydrocarbon without olefin at 30-350 DEGC, at a pressure of 0.1-10MPa, and at an air speed of 0.1-15/h for feed quality, wherein the aromatic hydrocarbon is aromatic hydrocarbon generated by reforming generated oil, reforming aromatic hydrocarbon or steam cracking. The method is simple in process flow, free of hydrogen consumption and low in device investment and operating cost. The catalyst activity is good in stability, the stable operation of the device is long and the aromatic hydrocarbon loss is small, so that the frequency switching operation between reaction and regeneration of a reactor is avoided. The catalyst is reproducible, so that a great amount of dead catalysts is not buried, therefore, the environmental influence is small.

Description

(1) Technical field [0001] The invention relates to a method for refining aromatic hydrocarbons, in particular to a method for removing trace olefins in aromatic hydrocarbons by using an M-SBA-15 mesoporous molecular sieve catalyst for acid-catalyzed reaction. (2) Background technology [0002] The catalytic reforming and aromatics extraction combined unit is one of the main processing units for the production of aromatics such as benzene, toluene, and xylene in petrochemical enterprises. It converts naphtha fractions into reformed oil. Reformate is rich in aromatics and solvent oil fractions, and also contains small amounts of olefins. This part of olefin impurities affects the aromatics extraction operation and the quality of aromatics products, and also affects some subsequent chemical processes. Therefore, in order to obtain qualified aromatics raw materials and ensure the smooth progress of subsequent processes, it is necessary to deeply remove the olefin impurities in...

Claims

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Application Information

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IPC IPC(8): C07C7/148C07C15/04C07C15/02
Inventor 任杰金辉
Owner ZHEJIANG UNIV OF TECH
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