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Energy-saving separation method of ethylbenzene and styrene

A technology for the separation of ethyl styrene and styrene, applied in the direction of distillation purification/separation, organic chemistry, etc., can solve the problem of high energy consumption, achieve the effects of reduced energy consumption for separation, large design temperature difference, and good technical effects

Active Publication Date: 2018-02-13
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 the problem of high energy consumption of the styrene separation system industrial device in the prior art
Provide a new energy-saving separation method of ethyl styrene and styrene

Method used

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  • Energy-saving separation method of ethylbenzene and styrene
  • Energy-saving separation method of ethylbenzene and styrene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A 100,000 tons / year styrene plant (annual operating hours 8000 hours), its styrene separation system adopts figure 1 technology, the ethylbenzene / styrene separation tower feed flow rate is 21.5 tons / hour, and the percentage by weight is composed of: benzene 0.4%, toluene 1.4%, ethylbenzene 36%, styrene 60%, heavy component 2.2%, ethylbenzene / The molar composition of water mixture (stream 13) is: ethylbenzene 25%, water 75%, main operation condition and consumption see table 1:

[0023] Table 1

[0024] Ethylbenzene / styrene tower T101 top pressure kPaA

[0025] Low-pressure ethylbenzene separation column reboiler E102 structure type

Embodiment 2

[0027] A 100,000 tons / year styrene plant (annual operating hours 8000 hours), its styrene separation system adopts figure 1 technology, the ethylbenzene / styrene separation tower feed flow rate is 21.5 tons / hour, and the percentage by weight is composed of: benzene 0.3%, toluene 1.0%, ethylbenzene 35%, styrene 61%, heavy component 1.8%, ethylbenzene / The molar composition of water mixture (stream 13) is: ethylbenzene 22%, water 78%, main operation condition and consumption are shown in Table 2:

[0028] Table 2

[0029] Ethylbenzene / styrene tower T101 top pressure kPaA

[0030] Styrene plant consumes circulating water tons / hour

Embodiment 3

[0032] A 100,000 tons / year styrene plant (annual operating hours 8000 hours), its styrene separation system adopts figure 1 technology, the ethylbenzene / styrene separation tower feed flow rate is 21.5 tons / hour, and the percentage by weight is composed of: benzene 0.5%, toluene 1.5%, ethylbenzene 37%, styrene 59%, heavy component 2.0%, ethylbenzene / The molar composition of water mixture (stream 13) is: ethylbenzene 20%, water 80%, main operation condition and consumption are shown in Table 3:

[0033] table 3

[0034] Ethylbenzene / styrene tower T101 top pressure kPaA

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Abstract

The invention relates to an energy-saving separation method of ethylstyrene and styrene, which mainly solves the problem of high energy consumption of industrial devices of a styrene separation system in the prior art. The present invention comprises the following steps by adopting: a) the dehydrogenation liquid mainly containing ethylbenzene and styrene enters the ethylbenzene / styrene separation tower T101, obtains the tower top gas stream I containing benzene, toluene, ethylbenzene and containing styrene The bottom liquid stream II; b) stream I enters the ethylbenzene / water azeotropic evaporator, heats the external ethylbenzene / water mixture, and obtains the ethylbenzene / water azeotrope stream III after heat exchange, and part of the stream I condenses The extraction enters the ethylbenzene separation tower; c) The ethylbenzene separation tower is divided into two towers (T102A, B) for operation, the pressure of T102A tower is higher, the pressure of T102B tower is lower, and the gas phase at the top of tower A is used to heat the liquid at the bottom of tower B The scheme solves this technical problem well and can be used in the industrial production of ethylbenzene / styrene separation.

Description

technical field [0001] The invention relates to an energy-saving separation method of ethylstyrene and styrene. 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 is the separation of ethylbenzene and styrene. Since the difference between the boiling points of ethylbenzene and styrene is very small, and the difference is only 9°C under normal pressure, the number of theoretic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/46C07C15/073C07C7/04C07C7/06
Inventor 刘文杰
Owner CHINA PETROLEUM & CHEM CORP
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