Method for separating ethylbenzene dehydrogenation reaction products
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A technology for reaction products and separation methods, applied in distillation purification/separation, organic chemistry, etc., can solve the problems of high energy consumption of separation devices and large loss of styrene polymerization, and achieve reduced polymerization loss, reduced separation energy consumption, and good technology. effect of effect
Active Publication Date: 2018-04-06
CHINA PETROLEUM & CHEM CORP +1
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[0006] The technical problem to be solved by the present invention is the problem of high energy consumption and large loss of styrene polymerization in the separation device of ethylbenzene dehydrogenation reaction product in the prior art
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Embodiment 1
[0018] A 100,000 tons / year styrene plant (annual operating hours 8000 hours), its styrene separation system adopts figure 1 The process, the ethylbenzene / styrene separation tower feed flow rate is 21.5 tons / hour, the weight percentage is composed of: benzene 0.4%, toluene 1.4%, ethylbenzene 36%, styrene 60%, heavy component 2.2%, the main operating conditions And consumption see Table 1:
[0019] Table 1
[0020] Ethylbenzene / styrene separation tower T101 top pressure kPaA
[0021] Compressor C101 outlet pressure KPaA
Embodiment 2
[0023] A 100,000 tons / year styrene plant (annual operating hours 8000 hours), its styrene separation system adopts figure 1 The process, the ethylbenzene / styrene separation tower feed flow rate is 22 tons / hour, the weight percentage is composed of: benzene 0.3%, toluene 1.5%, ethylbenzene 38%, styrene 58%, heavy component 2.2%, main operating conditions And consumption see Table 2:
[0024] Table 2
[0025] Ethylbenzene / styrene separation tower T101 top pressure kPaA
Embodiment 3
[0027] A 100,000 tons / year styrene plant (annual operating hours 8000 hours), its styrene separation system adopts figure 1 The process, the ethylbenzene / styrene separation tower feed flow rate is 22 tons / hour, the weight percentage is composed of: benzene 0.3%, toluene 1.5%, ethylbenzene 38%, styrene 58%, heavy component 2.2%, main operating conditions And consumption see Table 3:
[0028] table 3
[0029] Ethylbenzene / styrene separation tower T101 top pressure kPaA
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Abstract
The present invention relates to an ethylbenzene dehydrogenation reaction product separation method, and mainly solves the problems of high energy consumption and large styrene polymerization loss of conventional ethylbenzene dehydrogenation reaction product separation devices. The ethylbenzene dehydrogenation reaction product separation method well solves the problems, the ethylbenzene dehydrogenation reaction product separation method comprises the following steps: a first light component removal process is used in an ethylbenzene / styrene separation system, to be more specific, a dehydrogenation liquid first enters a crude styrene tower T101 for separation, an overhead material stream I mainly comprising benzene, toluene and ethylbenzene is obtained, the material stream I is compressed by a C101 compressor to obtain a material stream III, after heat exchange, the material stream III enters an ethylbenzene tower T102, benzene and toluene are obtained on top of the T102, a tower bottom liquid is circulating ethylbenzene, a T101 tower bottom material stream II mainly comprises styrene and high-boiling materials, the T101 tower bottom material stream II enters a styrene refining tower T103, a styrene product is obtained on top of the T103, high-boiling materials are obtained at the bottom of the tower, wherein the material stream III is used as a T102 or T103 reboiler heat source, or is divided into two flows used as respectively the T101 reboiler heat source and the T103 reboiler heat source, and the ethylbenzene dehydrogenation reaction product separation method can be used for industrial production of ethylbenzene / styrene separation.
Description
technical field [0001] The invention relates to a method for separating 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 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 t...
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