Method for producing ethyl benzene by catalysis, distillation and alkylation

A technology of catalytic distillation and catalytic distillation column is applied in the field of catalytic distillation to produce ethylbenzene, and can solve the problems such as difficult to reach, low reaction speed, lowering of ethylene partial pressure and the like

Inactive Publication Date: 2006-07-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
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Problems solved by technology

[0006] In the above invention, since the catalytic distillation tower or the tubular reactor operates under the condition of gas-liquid phase equilibrium, ethylene is enriched in the gas phase, and the ethylene concentration in the liquid phase is very low, and with the progress of the alkylation reaction between benzene and ethylene , the released reaction heat makes a large amount of benzene enter the gas phase from the liquid phase, which further reduces the partial pressure of ethylene in the gas phase, and the ethylene concentration in the liquid phase further decreases accordingly, while the alkylation reaction is carried out in the liquid phase, so the reaction speed is faster Low, difficult to achieve high ethylene conversion rate

Method used

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  • Method for producing ethyl benzene by catalysis, distillation and alkylation

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Experimental program
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Effect test

Embodiment 1

[0018] Embodiment 1 Catalytic distillation reaction process

[0019] The schematic diagram of the catalytic distillation column is shown in the attached figure 1 . The total height of the catalytic distillation column is 3.5m, including the overhead condenser, reaction section, stripping section and column bottom reboiler, without rectification section. The inner diameter of the reaction section and the stripping section is 25 mm, and the effective height of the reaction section is 1.5 meters. The catalyst strips (volume fraction 20%) of Φ1.6×4~6mm are mixed and filled with Φ4×4mm stainless steel rolling orifice rings; the stripping section is effective The height is 0.5 meters, and it is filled with Φ4×4mm stainless steel rolling ring. The total reflux operation is adopted. The condensate at the top of the column is measured by the reflux controller equipped with a metering tube and then all refluxed into the column. The reaction tail gas is measured and vented from the top...

Embodiment 2

[0021] Embodiment 2 adopts beta zeolite as catalyst

[0022] 100 grams of zeolite beta powder (SiO 2 / Al 2 O 3 For 27,600 ℃ roasting 3 hours weight loss 17%) and 47 grams of SB powder (a kind of pseudo-boehmite imported from Germany, 600 ℃ roasting 3 hours weight loss 25%), appropriate amount of succulent powder, add appropriate amount of nitric acid and Deionized water, extruded into strips, made into strips with a diameter of 1.6 mm, dried at 120 °C overnight, calcined in a muffle furnace at 540 °C for 3 hours, and then used 0.8M NH 4 NO 3 The aqueous solution was exchanged 3 times at 90°C, washed 3 times with deionized water, dried at 120°C for 4 hours, calcined at 530°C for 2 hours, and finally treated with water vapor at 350°C for 2 hours, and broken into catalysts with a length of 4-6 mm.

[0023] After 100 grams of the above catalyst was activated in high-purity nitrogen flow at 550°C for 1 hour, under the protection of high-purity nitrogen, it was mixed with 603 ml...

Embodiment 3

[0024] Embodiment 3 adopts Y zeolite as catalyst

[0025] 100 grams of HY zeolite raw powder (SiO 2 / Al 2 O 3For 10, 600 ℃ roasting 3 hours weight loss 19%) and 24 grams of SB powder (a kind of pseudo-boehmite imported from Germany, 600 ℃ roasting 3 hours weight loss 25%), an appropriate amount of saffron powder, add appropriate amount of nitric acid and Deionized water, extruded on an extruder to form a strip catalyst with a diameter of 1.6 mm, dried at 120 °C overnight, calcined in a muffle furnace at 500 °C for 2 hours, treated with water vapor at 400 °C for 2 hours, and broken into 4 pieces. ~6 mm long catalyst.

[0026] After 70 grams of the above-mentioned catalysts were activated at 550° C. for 1 hour in a high-purity nitrogen stream, mixed with 610 ml of stainless steel rolling pore rings of Φ4×4 mm under the protection of high-purity nitrogen, and then loaded into the reaction section of the catalytic distillation column according to Example 1. The same catalytic ...

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Abstract

The preparation method for ethylbenzene selects high-pure ethene or refinery dry gas as material for alkylation reaction in catalytic distillation tower. Wherein, the tower comprises a reboiler, a stripping section, a reaction section with one or more condensers to take up some heat and condense part benzene vapour to improve ethene conversion, and a condenser on tower top.

Description

technical field [0001] The invention relates to a method for producing ethylbenzene by catalytic distillation, in particular, a method for setting a condenser in the reaction section of a catalytic distillation column for producing ethylbenzene by catalytic distillation of benzene and ethylene to improve the conversion rate of ethylene. Background technique [0002] USP 4849569 discloses a catalytic distillation column for mixing benzene with C 2 -C 12 The method for producing alkylbenzene by alkylation of olefins adopts molecular sieve or acid ion exchange resin as catalyst, which has the advantages of not easy deactivation of catalyst, no need for periodic regeneration, full utilization of reaction heat, and feed benzene-ene ratio can be reduced to close to 1 Etc. [0003] USP 5476978 discloses a process for producing ethylbenzene by catalytic distillation. Fresh benzene enters a catalytic distillation column together with refluxing benzene to make the benzene in the cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/073C07C2/66
CPCY02P20/10Y02P20/52
Inventor 王清遐孙新德徐龙伢刘盛林
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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