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Catalyst for producing p-xylene by alkylation of benzene and methanol and preparation method thereof

A p-xylene and fluidized bed catalyst technology, applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the cumbersome preparation steps of catalysts, low p-xylene selectivity, low benzene conversion rate, etc. problems, achieve high stability, reduce production costs, and increase single-pass yield

Active Publication Date: 2018-04-10
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The problem to be solved by the present invention is that in the past literature, benzene and methyl alcohol alkylation catalyst benzene conversion rate is low, p-xylene selectivity in xylene isomers is low, The catalyst preparation steps are cumbersome and the problem of poor stability

Method used

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  • Catalyst for producing p-xylene by alkylation of benzene and methanol and preparation method thereof
  • Catalyst for producing p-xylene by alkylation of benzene and methanol and preparation method thereof
  • Catalyst for producing p-xylene by alkylation of benzene and methanol and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 3 Kg hydrogen ZSM-5 (SiO 2 / Al 2 o 3 =25, particle size 1-4 μm) molecular sieve, 4 Kg kaolin, 2 Kg silica sol were added to appropriate amount of water, stirred evenly, spray-dried and molded, roasted at 600°C for 3 h, recorded as raw powder A.

[0032] Take 0.9 Kg tetraethyl orthosilicate to make ethanol solution, impregnate it in raw powder A, and obtain raw powder A-I after drying; make 0.1Kg MgO (precursor is magnesium nitrate hexahydrate) into aqueous solution, soak it in roasted raw powder Powder A-I was dried to obtain the original powder A-II. The catalyst BTPX-01 was obtained after the raw powder A-II was roasted.

Embodiment 2

[0034] 3.5 Kg hydrogen ZSM-5 (SiO 2 / Al 2 o 3 =150, particle size 20-500 nm) molecular sieve, 1.5 Kg pseudoboehmite, 0.5 Kg alumina sol, 2 Kg kaolin, add appropriate amount of water, stir evenly, spray dry and form, roast at 600 °C for 3 h, record as raw powder b.

[0035] Take 2 Kg of tetraethyl orthosilicate to prepare ethanol solution, impregnate in raw powder B, and dry to obtain raw powder B-I; make 0.5 KgCaO (precursor is calcium nitrate tetrahydrate) into an aqueous solution, impregnate in raw powder B-I, dry Obtain former powder B-II afterward. The catalyst BTPX-02 was obtained after the raw powder B-II was roasted.

Embodiment 3

[0037] 1.5 Kg sodium ZSM-5 (SiO 2 / Al 2 o 3 =25, particle size 1-4 μm) molecular sieve, 3 Kg pseudo-boehmite, 3 Kg silica, 1.5 Kg alumina sol were added to an appropriate amount of water, stirred evenly, spray-dried and shaped, roasted at 600 °C for 3 h, recorded as the original Powder C.

[0038]Make 0.01 Kg MgO (the precursor is magnesium chloride) into an aqueous solution, impregnate it in Kg raw powder C, and dry it to obtain raw powder C-I; take 0.99 Kg tetrabutyl orthosilicate to make an ethanol solution, and dip it in the roasted raw powder C-I , to obtain the original powder C-II after drying. The catalyst BTPX-03 was obtained after the raw powder C-II was roasted.

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Abstract

The invention relates to a fluidized bed catalyst for preparing p-xylene through benzene and methanol alkylation in a high selectivity way and a preparation method of the fluidized bed catalyst. The fluidized bed catalyst is prepared from an active ingredient, a substrate material, a bonding agent and modified ingredients, wherein the active ingredient is a sodium type or hydrogen type ZSM-5 molecular sieve; the modified ingredients are a silicone alkyl compound and alkaline earth metal. The active ingredient, the substrate material and the bonding agent are mixed and sprayed for formation; then, the modified ingredients are used for modification to prepare the fluidized bed catalyst; or the active ingredient is modified by the modified ingredients at first, and is then mixed with the substrate material and the bonding agent for spraying to prepare the fluidized bed catalyst. The fluidized bed catalyst is used for benzene and methanol alkylation reaction; the single-pass conversion rate of the benzene reaches a value higher than 55 percent; the isomerization process is not needed; the obtained major product is the p-xylene; the selectivity of the p-xylene in the isomer is as high as more than 95 percent; the partial middle product is methylbenzene.

Description

technical field [0001] The invention relates to a fluidized bed catalyst for preparing p-xylene with high selectivity in the alkylation of benzene and methanol and a preparation method thereof, belonging to the technical field of catalysts. Background technique [0002] Paraxylene is an extremely important bulk chemical raw material, mainly used in the production of terephthalic acid (PTA) and dimethyl terephthalate (DMT). Due to the rapid development of my country's polyester industry, the consumption of PTA and DMT has increased, resulting in a rapid increase in the consumption of p-xylene. In contrast, the expansion speed of aromatics is lower than the demand growth, and the self-sufficiency rate of p-xylene is only about 60%. It is estimated that the demand for p-xylene will be as high as 20.7 million tons in 2015. [0003] In industry, p-xylene is generally produced by the separation of aromatics from petroleum cracking products, disproportionation of toluene or transa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/40C07C2/86C07C15/08
CPCY02P20/52
Inventor 张世刚辛玉兵汪彩彩张军民刘建斌陈亚妮张变玲张小虎
Owner SHAANXI COAL & CHEM TECH INST
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