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CHINESE JOURNAL OF CHEMICAL ENGINEERING · 2016 · IF 1.207

Isomerization of alkyl naphthalene and refining of 2-methylnaphthalene

Hao Sun,Saijian Shi,Zhenggui Gu

A preparation process of 2-methylnaphthalene (2-MN) was proposed by isomerization , side-stream distillation and extractive distillation. The isomerization of alkyl naphthalene was catalyzed by acid-treated HBEA zeolites, and the 2-MN selectivity of isomerization was 92.70%. Side-stream distillation and extractive distillation were investigated by simulation, and effects of operation parameters on 2-MN were studied. Further, the simulated results were verified by experiment. Under the optimal condition, the mass fraction of 2-MN reached to 98.09% in the product, and the yield was 83.84% in refining process.

CAS / MDL: 117-81-7 144-62-7

研究领域: 化学工程 · 催化反应工程

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RESEARCH ON CHEMICAL INTERMEDIATES · 2017 ·Vol. 43 ·期 8 ·4697-4710 · IF 1.369

Impact of acidic properties of HBEA zeolite on isomerization of 1-methylnaphthalene

Sun Hao,Huang Xin,Wang Fang,Gu Zhenggui

Selective isomerization of 1-methylnaphthalene was carried out in a fixed-bed reactor over HBEA catalysts modified by acid and tetraethoxysilane treatments, respectively. Catalysts were characterized by X-ray diffraction, NH 3 temperature-programmed desorption, N 2 physisorption, inductively coupled plasma analysis, thermogravimetric analysis and Fourier transform infrared spectrometry after adsorption of pyridine. The results demonstrated that tetraethoxysilane treatment successfully passivated external active sites of the zeolite, but had little effect on the selectivity of isomerization reaction and catalytic stability. Dealumination of HBEA zeolite by treatment with oxalic and hydrochloric acids can lead to higher surface area and pore volume. Sufficiently strong Brönsted acidic sites were found to be responsible for the isomerization activity. Furthermore, a decrease in the number of Lewis acidic sites in acid-modified zeolites were advantageous to suppress the hydride transfer and subsequent side reactions that form coke, leading to higher 2-methylnaphthalene selectivity and longer catalytic life.

CAS / MDL: 90-12-0

研究领域: 化学工程 · 催化科学

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Isomerization of alkyl naphthalene and refining of 2-methylnaphthalene

Impact of acidic properties of HBEA zeolite on isomerization of 1-methylnaphthalene