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Catalyst for synthesizing para diethyl benzene by ethanol and ethyl benzene combination reaction and its preparation method

A technology for p-diethylbenzene and a catalyst is applied in the field of catalysts for synthesizing p-diethylbenzene, can solve the problems of high production cost of diethylbenzene, high content of modified elements, low yield of p-diethylbenzene, etc. The effect of good ethylbenzene selectivity, strong anti-coking ability and low cost

Inactive Publication Date: 2005-04-13
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the catalyst preparation process used in above production process is complicated, and modification element content is higher (as the Mg content of the catalyst that reaches ideal selectivity is 11wt%), and p-diethylbenzene productive rate is lower (5%~10%), to The production cost of diethylbenzene is higher

Method used

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  • Catalyst for synthesizing para diethyl benzene by ethanol and ethyl benzene combination reaction and its preparation method
  • Catalyst for synthesizing para diethyl benzene by ethanol and ethyl benzene combination reaction and its preparation method
  • Catalyst for synthesizing para diethyl benzene by ethanol and ethyl benzene combination reaction and its preparation method

Examples

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example 1

[0020] Example 1 Synthesis of B(1%)-Co(2%)-ZSM-5-01 catalyst

[0021] Weigh 0.5g of cobalt nitrate and 5g of H-ZSM-5 molecular sieve and dissolve in 40ml of distilled water, stir quickly (800r / min) for 10 hours, transfer the mixture to an oven at 80℃ for drying, and then re-dissolve the resulting powder In 40ml of distilled water, add 0.305g of boric acid as the precursor of B, repeat the above steps of stirring and drying, and finally put the obtained powder into a muffle furnace at 550°C for 4 hours and sieving out 400~ The 800 micron catalyst is ready for use.

example 2

[0022] Example 2 Synthesis of B(1%)-Mg(0.5%)-Co(1%)-ZSM-5-02 catalyst

[0023] Weigh 0.25g cobalt nitrate and 5g H-ZSM-5 molecular sieve and dissolve in 40ml distilled water, stir quickly (800r / min) for 10 hours, then transfer the mixture to an oven at 80℃ for drying, and then re-dissolve the resulting powder Add 0.27g of magnesium nitrate to 40ml of distilled water, repeat the above steps of stirring and drying, and then dissolve the obtained powder in 40ml of distilled water, add 0.305g of boric acid as the precursor of B, and repeat the above steps of stirring and drying again Finally, put the obtained powder into a muffle furnace at 550°C for 4 hours and sieving out a 400-800 micron catalyst for later use.

example 3

[0024] Example 3 Synthesis of B(1.5%)-Mg(0.5%)-Co(1%)-ZSM-5-03 catalyst

[0025] Weigh 0.25g of cobalt nitrate and 5g of H-ZSM-5 molecular sieve and dissolve in 40ml of distilled water, stir quickly (600r / min) for 10 hours, then transfer the mixture to an oven at 80℃ for drying, and then re-dissolve the resulting powder Add 0.27g of magnesium nitrate to 40ml of distilled water, repeat the above steps of stirring and drying, then dissolve the obtained powder in 40ml of distilled water, add 0.455g of boric acid as the precursor of B, and repeat the above steps of stirring and drying again Finally, put the obtained powder into a muffle furnace at 550°C for 4 hours and sieving out a 400-800 micron catalyst for later use.

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Abstract

The present invention relates to catalyst for alkylating ethanol and ethyl benzene into p-diethylbenzene and its preparation process. The industrial catalyst for efficient synthesis of p-diethylbenzene is prepared with the H-ZSM-5 molecular sieve with Si / Al ratio of 50 as basic matter and through surface acidity and tunnel regulation with B, Mg and Co, and has ideal pore size distribution and in-tunnel acidity distribution and strong coking resisting capacity. The precursor of B is boric acid, that of Mg is magnesium nitrate and that of Co is cobalt nitrate. The mass ratio between B and H-ZSM-5 molecular sieve is 1-3 %, that between Mg and H-ZSM-5 molecular sieve is 0.1-1 % and that between Co and H-ZSM-5 molecular sieve is 1-3 %. Compared with available similar catalyst, the present invention has the features one simple preparation process, low cost, high selectivity and yield of p-diethylbenzene, etc.

Description

Technical field [0001] The invention relates to a catalyst for synthesizing p-diethylbenzene, in particular a catalyst for the alkylation of ethanol and ethylbenzene to synthesize p-diethylbenzene and a preparation method. It has a simple preparation method, low catalyst preparation cost, and p-diethylbenzene selectivity Higher merits. Background technique [0002] Para-xylene is an important isomer of xylene. It is the basic raw material for the production of polyester. The bulk product of polyester is fiber. Because of its excellent quality, it occupies a very important position in the development of synthetic fiber industry. The desorbent of para-xylene adsorption and separation process, para-diethylbenzene is currently the most widely used of the three isomers of diethylbenzene. At the same time, p-diethylbenzene can also be dehydrogenated to produce p-divinylbenzene, which is also an important chemical raw material. At present, the annual consumption of p-diethylbenzene in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/46C07C15/073
Inventor 关乃佳李娜陈继新章福祥
Owner NANKAI UNIV
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