Method for removing trace sulfur in styrene by catalytic rectification

A technology of catalytic rectification and catalytic rectification column is applied in the field of catalytic rectification to remove trace amount of sulfur in styrene, which can solve problems such as difficulty in removal, and achieve the effect of good technical effect.

Active Publication Date: 2012-11-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention relates to a method for removing trace sulfur in styrene by catalytic rectification, which mainly solves the problem of difficult removal of trace sulfur in styrene recovered from pyrolysis gasoline, and provides a method for removing trace sulfur in styrene recovered from pyrolysis gasoline by catalytic rectification. Trace Sulfur Method

Method used

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  • Method for removing trace sulfur in styrene by catalytic rectification

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The number of theoretical plates in the rectification section of the catalytic rectification tower is 10, the number of theoretical plates in the stripping section is 10, the height of the reaction section is equivalent to the height of 5 theoretical plates, the catalyst is D001 macroporous ion exchange resin, and the ion exchange resin ions The form is hydrogen ion, sulfur-containing styrene and isobutylene respectively enter from the fifth theoretical plate (counting from top to bottom, the same below) and the tower kettle of the stripping section of the catalytic rectification tower, and the flow rate of sulfur-containing styrene is 30 grams / min, the sulfur content is 150ppm, the flow rate of isobutene is 5 milliliters / min, and the reflux ratio is 6, and the output of the liquid phase at the top of the tower is 27 g / min, and the operating pressure is 4KPa. After stable operation, the desulfurization styrene at the top of the tower is The sulfur content is 10ppm, the ...

Embodiment 2

[0016] The number of theoretical plates in the rectification section of the catalytic rectification tower is 30, the number of theoretical plates in the stripping section is 30, the height of the reaction section is equivalent to the height of 20 theoretical plates, the catalyst is ZSM-5 molecular sieve catalyst, and the silicon-aluminum ratio is 45 , sulfur-containing styrene and isobutylene enter respectively from the 10th theoretical plate (counting from top to bottom, the same below) and the tower kettle of the stripping section of the catalytic rectification tower, the sulfur-containing styrene flow rate is 30 g / min, and the sulfur content is 200ppm, the flow rate of isobutylene is 135 ml / min, the reflux ratio is 0.3, the output of liquid phase at the top of the tower is 28.5 g / min, and the operating pressure is 20KPa. After the operation is stable, the sulfur content of desulfurized styrene at the top of the tower is 4ppm, and the gas phase The unreacted isobutene is extr...

Embodiment 3

[0018] The number of theoretical plates in the rectification section of the catalytic rectification tower is 15, the number of theoretical plates in the stripping section is 20, the height of the reaction section is equivalent to the height of 10 theoretical plates, the catalyst is ZSM-5 molecular sieve catalyst, and the silicon-aluminum ratio is 45 , sulfur-containing styrene and isobutylene enter respectively from the 10th theoretical plate (counting from top to bottom, the same below) and the tower kettle of the stripping section of the catalytic rectification tower, the sulfur-containing styrene flow rate is 30 g / min, and the sulfur content is 180ppm, the flow rate of isobutylene is 45 ml / min, the reflux ratio is 1.2, the output of the liquid phase at the top of the tower is 28.5 g / min, and the operating pressure is 10KPa. After the operation is stable, the sulfur content of the desulfurized styrene at the top of the tower is 8ppm, and the gas phase The unreacted isobutene ...

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Abstract

The invention relates to a method for removing trace sulfur in styrene by catalytic rectification, which mainly solves the problem of difficult removal of the trace sulfur in the styrene recovered from pyrolysis gasoline. The method comprises the following steps that: sulfur-containing styrene (the sulfur content is less than or equal to 500ppm) and isobutene enter from a stripping section and the tower bottom of a catalytic distillation tower respectively, a sulfur-containing component in the styrene and the isobutene react to form a heavy component in a reaction section, the separation of the styrene and the generated heavy component is realized in the catalytic distillation tower at the same time, the tower top is provided with a fractional condenser, isobutene is extracted by a gas phase, desulfurized styrene is extracted by a liquid phase, the sulfur content is less than or equal to 10ppm, and the styrene containing the heavy component sulfur is obtained in the tower. The technical proposal better solves the problem, and can be used for industrial application of the trace sulfur removal in the styrene recovered from the pyrolysis gasoline.

Description

technical field [0001] The invention relates to a method for removing trace sulfur in styrene by catalytic rectification. Background technique [0002] In the ethylene cracking unit using naphtha as raw material, the content of xylene is 0.06-0.07 tons / ton of ethylene, while pyrolysis gasoline C 8 The ratio of xylene:styrene:ethylbenzene in the distillate is usually 4:3:1. According to this calculation, a set of 600,000 tons / year ethylene plant can recover about 29,000 tons / year of styrene. If the ethylbenzene is dehydrogenated and recovered, the output of styrene can be increased, which has a certain recovery value. The recovery of styrene from pyrolysis gasoline can eliminate the hydrogen consumption of styrene hydrogenation in traditional pyrolysis gasoline units, thereby reducing the load on hydrogenation units; the ethylbenzene content in recovered mixed xylene is greatly reduced, which can be used as xylene isomerization Raw material for the production of p-xylene; a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/46C07C7/148
CPCY02P20/10
Inventor 钟禄平肖剑郭艳姿卢咏琰
Owner CHINA PETROLEUM & CHEM CORP
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