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A technology of ethylbenzene styrene and separation method, applied in distillation purification/separation, organic chemistry and other directions, can solve the problem of high energy consumption, and achieve the effects of reducing separation energy consumption, less investment, and large design temperature difference
Active Publication Date: 2016-06-15
CHINA PETROLEUM & CHEM CORP +1
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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 s
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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 tower 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 present invention relates to an ethylbenzene/styrene energy-saving separation method, and mainly solves the high energy consumption problem of ethylbenzene/styrene separation system industrial devices in the prior art. The ethylbenzene/styrene energy-saving separation method can well solve the problem, the ethylbenzene/styrene energy-saving separation method comprises the following steps: a) a dehydrogenation liquid containing mainly ethylbenzene and styrene enters an ethylbenzene/styrene separation tower T101 to obtain an overhead gas material stream I containing benzene, toluene and ethylbenzene and a tower bottom liquid material stream II containing styrene; b) the material stream I enters an ethylbenzene / water azeotrope evaporator, an external ethylbenzene / water mixture is heated to obtain a heat-exchanged ethylbenzene / water azeotrope material stream III, and the material stream I is condensed and partly collected to enter an ethylbenzene separation tower; c) the ethylbenzene separation tower is divided into two towers (T102A and B) for operation, pressure of the T102A is higher, pressure of the T102B is lower, and a T102A overhead gas phase is used for heating a T102B bottom liquid, and the ethylbenzene/styrene energy-saving separation method can be used for 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...
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