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Energy-saving separation method for ethylbenzene dehydrogenation reaction product

A reaction product, ethylbenzene dehydrogenation technology, applied in distillation purification/separation, organic chemistry, etc., to achieve the effect of small heat exchange area, small equipment investment, and low polymerization loss

Inactive Publication Date: 2016-05-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is that the reduction of styrene polymerization loss and the reduction of operating energy consumption in the styrene industrial plant in the prior art cannot be balanced, and a new energy-saving separation method for ethylbenzene dehydrogenation reaction products is provided

Method used

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  • Energy-saving separation method for ethylbenzene dehydrogenation reaction product
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  • Energy-saving separation method for ethylbenzene dehydrogenation reaction product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A 100,000 tons / year styrene plant (annual operating hours 8000 hours), its ethylbenzene / styrene tower adopts figure 1 According to the technology, the ethylbenzene / styrene separation tower feed weight percentage is composed of: toluene 0.5%, ethylbenzene 37%, styrene 60%, heavy component 2.5%, and the molar composition of ethylbenzene / water mixture (streaming 5) is: Ethylbenzene 25%, water 75%, the main operating conditions and consumption are shown in Table 1:

[0021] Table 1

[0022]

Embodiment 2

[0024] A 100,000 tons / year styrene plant (annual operating hours 8000 hours), its ethylbenzene / styrene tower adopts figure 1 According to the technology, the ethylbenzene / styrene separation tower feed weight percentage is composed of: toluene 0.5%, ethylbenzene 37%, styrene 60%, heavy component 2.5%, and the molar composition of ethylbenzene / water mixture (streaming 5) is: Ethylbenzene 25%, water 75%, the main operating conditions and consumption are shown in Table 2.

[0025] Table 2

[0026]

Embodiment 3

[0028] A 100,000 tons / year styrene plant (annual operating hours 8000 hours), its ethylbenzene / styrene tower adopts figure 1 According to the technology, the ethylbenzene / styrene separation tower feed weight percentage is composed of: toluene 0.5%, ethylbenzene 37%, styrene 60%, heavy component 2.5%, and the molar composition of ethylbenzene / water mixture (streaming 5) is: Ethylbenzene 30%, water 70%, the main operating conditions and consumption are shown in Table 3.

[0029] table 3

[0030]

[0031]

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PUM

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Abstract

The invention relates to an energy-saving separation method for ethylbenzene dehydrogenation reaction product, which mainly solves the problems that reduction of styrene polymerization loss by an ethylbenzene dehydrogenation product separating industrial apparatus and reduction of operation energy consumption cannot be combined. The method comprises the following steps: a) a reaction dehydrogenation liquid containing ethylbenzene and styrene is introduced into an ethylbenzene / styrene separating tower to obtain tower top gas material current I and styrene containing tower bottom material current II; b) the material current II is put in a refined styrene separation tower for separation, the material current I is compressed to 30-100 KPaA and then introduced into an ethylbenzene / water azeotropic evaporator, an ethylbenzene / water mixture from the outside is heated to obtain an ethylbenzene / water azeotropic material current III after heat exchanging, the condensed material current I is partially returned to the tower top, and the condensed material current I is partially refined; and c) the material current III is returned to a reaction area, and wherein an operating pressure of the ethylbenzene / styrene separation tower top is 4-less than 25kPaA. The technical scheme better solves the technical problems and can be applied to the industrial production requiring the separation of the styrene.

Description

technical field [0001] The invention relates to an energy-saving separation method for ethylbenzene dehydrogenation reaction products. Background technique [0002] Styrene is one of the most important basic organic chemical raw materials. It is mainly produced by dehydrogenation of ethylbenzene in industry. It is used for self-polymerization to produce polystyrene and expanded polystyrene, and it can also be produced by copolymerization with other unsaturated compounds. Various products such as synthetic rubber and resin, such as styrene / butadiene copolymer latex, styrene-butadiene rubber and latex, unsaturated polyester and others such as styrene / methyl methacrylate latex, ion exchange resins and drugs, etc. [0003] The key to the rectification part of the styrene production process lies in the separation of ethylbenzene and styrene. Since the difference between the boiling points of ethylbenzene and styrene is very small, the difference is only 9°C under normal pressure....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/46C07C7/04
Inventor 刘文杰
Owner CHINA PETROLEUM & CHEM CORP