Method for separating and cracking cyclopentadienyl from carbon 5 fraction by reaction distillation
A technology for separating cyclopentadiene and reactive distillation, which is applied in the field of separation of cracked carbon five fractions, can solve problems affecting the separation of cyclopentadiene, achieve reduction of side dimerization reactions, high separation effect, and improve product quality Effect
Active Publication Date: 2009-08-19
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0007] The present invention aims at the problem that the secondary dimerization reaction that generates X3 and X2 affects the separation of cyclopentadiene in the current cracking carbon five fraction separation industry, and proposes the use of reaction Method for separating cyclopentadiene from cracked carbon five cuts by rectification
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Embodiment 1
[0045] Using the cracked C5 fraction of a certain factory as raw material, the reactive distillation separation method of the present invention is used to separate the cracked C5 fraction. The composition of the raw material and the composition of the incoming and outgoing streams of each operating device are listed in Table 1 below.
[0046] (1) Cracking C5 raw material enters the middle part of reactive distillation tower 1, and described reactive distillation tower 1 is a plate rectification tower, has 100 theoretical plates, and the design residence time of each plate is 15 seconds, and the reflux ratio is 8, the temperature at the top of the tower is 45°C, and the stream containing isoprene is extracted from the top of the reactive distillation tower 1 through the reactive distillation process, and enters the middle part of the pre-light removal tower 2, which has 100 The number of theoretical plates, the reflux ratio is 20, and the temperature at the top of the tower is 4...
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The invention discloses a method for separating cyclopentadiene by reaction rectification, belongs to a separation method of cracking C5 fraction, solves the problem of secondary dimerization reaction for generating X3 and X2 in the prior thermal dimerization method for separating cyclopentadiene, and provides a method for separating cyclopentadiene from cracking C5 fraction by reaction rectification method. The method comprises steps of sending the cracking C5 fraction into the middle part of a reaction rectification tower, taking out fluid containing isoprene from the top of the tower through a reaction rectification process, and taking out fluid containing pentadiene, cyclopentadiene and dicyclopentadiene from the tower bottom. The method reduces the yield of X3 and the loss rate of isoprene. The method can reduce the amount of cyclopentadiene entering an extracting unit, coking amount of an extracting and rectifying unit and regenerating amount of solvent in the process of separating cyclopentadiene from cracking C5 fraction.
Description
technical field [0001] The present invention relates to a kind of separation method of cracking C5 fraction, more specifically, the present invention relates to a kind of method adopting reactive distillation technology to separate cyclopentadiene. Background technique [0002] In the process of producing ethylene from petroleum cracking, a considerable amount of C5 fraction is by-produced, and the C5 fraction is rich in diolefins such as isoprene, cyclopentadiene and piperylene. These diolefins are chemically active and are important chemical raw materials. Due to the difference in cracking raw materials, cracking depth and separation degree of petroleum hydrocarbons, the content of diolefins in the cracked C5 fraction is different, and the total content is between 40% and 60%. Therefore, the separation and utilization of C5 fractions has far-reaching significance for improving the economic benefits of ethylene plants and comprehensively utilizing petroleum resources. [...
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CPCY02P20/10
Inventor 田保亮戴伟杜春鹏唐国旗胡競民冯海强张齐高继东鲁耘
Owner CHINA PETROLEUM & CHEM CORP