Method for producing butadiene based on ionic liquid complex solvent
An ionic liquid and composite solvent technology, applied in the field of olefin production, can solve the problems of high energy consumption, low selectivity and equipment corrosion of butadiene, and achieve the effect of increasing the recovery section, reducing the loss of acetonitrile and reducing the loss
Inactive Publication Date: 2011-08-10
INST OF PROCESS ENG CHINESE ACAD OF SCI
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[0006] In order to solve the problems of high energy consumption, serious polymerization (because the temperature of the extraction tower is too high), solvent loss, equipment corrosion and low selectivity in the extraction of butadiene by the existing acetonitrile method, the present invention proposes a composite solvent based on ionic liquid The new butadiene production process can not only solve the serious problem of butadiene polymerization in the extraction section, but also reduce the loss of acetonitrile and energy consumption, and at the same time improve the production efficiency of butadiene
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Embodiment 1
[0031] Adopt above-mentioned embodiment, mixing C4 flow rate is 15710kg / h (butadiene mass fraction is 53.46%), ionic liquid composite solvent ([emim][PF 6 ]: acetonitrile: water=7.5: 80: 12.5, mass ratio) is 128945kg / h. The results of this embodiment have been compared with the former acetonitrile process, and the results are listed in Tables 1 and 2, from which it can be seen that the ionic liquid process is superior to the former in terms of acetonitrile consumption, energy consumption, product purity or extraction kettle temperature. The existing acetonitrile method is better. Simultaneously in this embodiment, the distribution of ionic liquid in flow process is as follows figure 2 As shown, it can be seen that the recovery rate of ionic liquid can reach 99.9%, and the loss amount is 8.68×10 -2 kg / ton of butadiene.
[0032] Table 1 Comparison of key performance indicators of the two processes
[0033]
[0034]
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The invention discloses a method for producing butadiene, and belongs to the technical field of olefin production. In order to solve uneconomical problems of high tower temperature, blockage of a tower plate due to butadiene polymerization, severe solvent loss and the like in the conventional process for extracting the butadiene through an acetonitrile method, the invention provides a new process for producing butadiene based on an ionic liquid complex solvent. By adopting technical means such as extractive distillation, common distillation and the like, a composite extractant prepared from ionic liquid, acetonitrile and water is used for separating the butadiene from other hydrocarbons in C4 fraction. Compared with the conventional acetonitrile process, the method has the advantages of obviously reducing process energy consumption, reducing butadiene polymerization, reducing consumption of acetonitrile, and improving the yield and purity of the butadiene; and the invention provides a scheme of recovering ionic liquid in industrial application, which can realize high recovery rate of the ionic liquid.
Description
Technical field: [0001] The invention relates to a butadiene production method, which belongs to the technical field of olefin production, and in particular relates to a process for extracting and separating butadiene from C4 mixed components by using an ionic liquid composite solvent. Background technique: [0002] 1,3-Butadiene is an important petrochemical basic organic raw material and synthetic rubber monomer. It is one of the most important components in the C4 fraction, and its position in petrochemical olefin raw materials is second only to ethylene and propylene. Because its molecule contains conjugated diene, it can undergo reactions such as substitution, addition, cyclization and polymerization, making it widely used in synthetic rubber and organic synthesis. [0003] At present, extracting and rectifying butadiene from the by-product mixed C4 fraction of petroleum hydrocarbon cracking ethylene plant is the main production method of butadiene at present. This meth...
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IPC IPC(8): C07C11/167C07C7/08
CPCY02P20/54
Inventor 张香平田肖曾少娟董海峰徐琰聂毅周清赵延松张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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