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Aromatization method

An aromatization and catalyst technology, applied in the field of aromatization, to achieve good selectivity and good technical effect

Active Publication Date: 2017-01-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, the conversion of levulinic acid is mainly concentrated in the conversion to fine chemicals such as alcohols and esters, and there are few reports on the conversion of levulinic acid to aromatics such as benzene, toluene, and xylene.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 60 grams of corn stalks, place in an autoclave and add 700 grams of water, then add a 5mol / L sulfuric acid solution with 7% water quality, heat up to 180°C and react for 45 minutes, then cool, and the cooled reaction solution Filtrate to obtain filter cake and filtrate, the filtrate is the hydrolyzate of cellulose, after the reaction, the mass spectrometry is used to identify the reaction result. The main product is levulinic acid, and its production amount is 18 grams.

[0025]Weigh 35 grams of ZSM-5 with a silicon-aluminum ratio of 25 and mix it with 35 grams of γ-alumina additive, add 2.7 grams of scallop powder, and mix well. Then add 48 grams of nitric acid aqueous solution with a mass percentage of nitric acid of 5.5%, knead and shape, and extrude. The obtained catalyst precursor was dried at 120° C. for 8 hours and calcined at 500° C. for 2 hours to obtain molecular sieve catalyst C1.

[0026] Catalyst activity evaluation is carried out on a fixed bed, the...

Embodiment 2

[0028] Weigh 35 grams of ZSM-5 with a silicon-aluminum ratio of 50 and mix them with 35 grams of pseudo-boehmite, add 2.7 grams of celadon powder, and mix well. Then add 48 grams of nitric acid aqueous solution with a mass percentage of nitric acid of 5.5%, knead and shape, and extrude. The obtained catalyst precursor was dried at 120° C. for 8 hours and calcined at 500° C. for 2 hours to obtain molecular sieve catalyst C2.

[0029] Catalyst activity evaluation is carried out on a fixed bed, the reaction conditions catalyst mass is 3 grams, the reaction substrate is levulinic acid, and the weight space velocity is 3.0 hours -1 , hydrogen pressure 1.0MPa, flow 50mlmin -1 , temperature 450°C. After the reaction, the conversion rate of the reaction substrate was 96%, and the selectivity of BTX was 86%.

Embodiment 3

[0031] Weigh 35 grams of ZSM-5 with a silicon-aluminum ratio of 150 and mix them with 35 grams of pseudo-boehmite, add 2.7 grams of safflower powder, and mix well. Then add 48 grams of nitric acid aqueous solution with a mass percentage of nitric acid of 5.5%, knead and shape, and extrude. The obtained catalyst precursor was dried at 120° C. for 8 hours and calcined at 500° C. for 2 hours to obtain molecular sieve catalyst C3.

[0032] Catalyst activity evaluation is carried out on a fixed bed, the reaction conditions catalyst mass is 3 grams, the reaction substrate is levulinic acid, and the weight space velocity is 2.5 hours -1 , hydrogen pressure 4.0MPa, flow 50mlmin -1 , temperature 550°C. After the reaction, the conversion rate of the reaction substrate was 99%, and the selectivity of BTX was 89%.

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Abstract

The invention relates to an aromatization method. Under the aromatization conditions, the raw material is in contact with a molecular sieve catalyst to generate an aromatic hydrocarbon stream containing benzene, toluene and xylene, wherein the raw material has a structural formula (I), in the formula, R1 is optionally substituted C1-8 linear or branched alkyl, and R2 is hydrogen, optionally substituted C1-10 linear or branched alkyl, and n is a positive integer from 1 to 6. The method can be used in the field of non-fossil resource aromatic hydrocarbon preparation.

Description

technical field [0001] The invention relates to an aromatization method, in particular to a method for preparing benzene, toluene and xylene light aromatic hydrocarbons by aromatization. Background technique [0002] Aromatic products are widely used in many fields such as polyester, chemical fiber, rubber, medicine, and fine chemicals. The domestic consumption is considerable, which has an important impact on the development of the national economy. At the same time, it is an important basic organic chemical raw material for social development. Benzene, toluene, and xylene are three aromatic bulk chemicals widely used in aromatic hydrocarbons. Benzene is a versatile basic petrochemical raw material that can be used to produce numerous products derived from it, including ethylbenzene / styrene, cumene / phenol, and more. Paraxylene is mainly used in the manufacture of terephthalic acid, via terephthalic acid (PTA) or diethyl terephthalate (DMT) intermediates, for the production...

Claims

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Application Information

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IPC IPC(8): C07C1/207C07C15/04C07C15/06C07C15/08B01J29/40B01J29/65B01J29/70B01J29/08
CPCY02P20/52
Inventor 郑均林宋奇孔德金祁晓岚
Owner CHINA PETROLEUM & CHEM CORP
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