Method for sequential separation and azeotropic recovery of ethyl benzene/styrene
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A technology of azeotropic heat recovery and sequential separation, applied in distillation purification/separation, organic chemistry, etc., to achieve the effect of small equipment investment and low polymerization loss
Active Publication Date: 2010-06-16
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0006] The technical problem to be solved by the present invention is that in the prior art, the reduction of styrene polymerization loss and the reduction of operating energy consumption cannot be taken into account in the styrene industrial plant, and a new method for the sequential separation and azeotropic heat recovery of ethyl styrene and styrene is provided
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Embodiment 1
[0018] 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 / water mixture flow is all compressed into the reaction zone, and the ethylbenzene / styrene separation column feed weight percentage is composed of: 0.5% toluene, 37% ethylbenzene, 60% styrene, 2.5% heavy components, ethylbenzene The molar composition of the benzene / water mixture (stream 5) is: ethylbenzene 25%, water 75%, the main operating conditions and consumption are shown in Table 1.
[0019] Table 1 Sequential separation azeotropic heat recovery process
[0020] Ethylbenzene / styrene column 4 top pressure kPaA
[0021] Ethylbenzene / styrene column 4 top pressure kPaA
Embodiment 2
[0023] 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 / water mixture flow is all compressed into the reaction zone, and the ethylbenzene / styrene separation column feed weight percentage is composed of: 0.5% toluene, 37% ethylbenzene, 60% styrene, 2.5% heavy components, ethylbenzene The molar composition of the benzene / water mixture (stream 5) is: ethylbenzene 25%, water 75%, the main operating conditions and consumption are shown in Table 2.
[0024] Table 2 Sequential separation azeotropic heat recovery process
[0025] Ethylbenzene / styrene column 4 top pressure kpaA
Embodiment 3
[0027] 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 / water mixture flows into the reaction zone through compression, and the ethylbenzene / styrene separation tower feed weight percentage is composed of: toluene 0.5%, ethylbenzene 37%, styrene 60%, heavy component 2.5%, ethylbenzene The molar composition of the water / water mixture (stream 5) is: ethylbenzene 30%, water 70%, and the main operating conditions and consumption are shown in Table 3.
[0028] Table 3 Sequential separation azeotropic heat recovery process
[0029] Ethylbenzene / styrene column 4 top pressure kPaA
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Abstract
The invention relates to a method for sequential separation and azeotropic recovery of ethyl benzene/styrene and mainly aims to solve the problems existing in the prior art that the reduction of the polymerization loss of styrene and the reduction of the operating energy consumption cannot be simultaneously achieved in an ethyl benzene/styrene separation industrial device. The method comprises the following steps of: a) making ethyl benzene and styrene containing tower bottoms of a benzene-toluene tower enter an ethyl benzene/styrene separating tower to obtain ethyl benzene containing tower top gas material current I and styrene containing tower bottom material current II; b, putting the material current II in a refined styrene separation tower for separation, putting the material current I in an ethyl benzene/water azeotropic evaporator, heating an ethyl benzene/water mixture from the outside to obtain the ethyl benzene/water azeotropic material current III exchanging heat, partially returning the condensed material current I to the tower top, and partially circulating the condensed material current I to a reaction area; and c), compressing the material current III, and transferring the compressed material current III to the reaction area, wherein an operating pressure of the ethyl benzene/styrene separation tower top is 5 to 20kPaA. The technical scheme better solves the technical problems and can be applied to the industrial production requiring the separation of the ethyl benzene.
Description
technical field [0001] The invention relates to an ethylbenzene / styrene sequential separation azeotropic heat recovery method. Background technique [0002] Styrene is one of the most important basic organic chemical raw materials, used to manufacture polystyrene PS and EPS, ABS and SAN and other copolymer resins, styrene / butadiene copolymer latex SB, styrene-butadiene rubber and latex SBR, unsaturated Polyester and others such as styrene / methyl methacrylate latex, methyl methacrylate / butadiene / styrene copolymer MBS, 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, the difference is only 9°C under normal pressure. Therefore, for the separation of ethylbenzene / styrene (generally Styrene at the top of the tower is required to be less than 2%, and ethylbenzene at the bottom of t...
Claims
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Application Information
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