Method for producing cyclopentene from cyclopentadiene
A technology of cyclopentadiene and cyclopentene, which is applied in organic chemistry, hydrogenation hydrocarbon production, distillation purification/separation, etc., can solve the problems of increasing reactor processing load, equipment investment cost, large circulation volume, etc., and achieve product separation Simplify the process and improve the effect of conversion rate
Active Publication Date: 2017-05-17
CHINA PETROLEUM & CHEM CORP +1
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CN1011877 discloses a method for hydrogenating cyclopentadiene to produce cyclopentene. The method adopts external circulation of reaction effluent to obtain heat, and the weight ratio of the output volume to the circulation volume is 1: (4-12), but the The circulation volume of the method is relatively large, which will inevitably increase the processing load of the reactor and the equipment investment cost
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Embodiment 1-5
[0030] The raw material containing cyclopentadiene used in each embodiment of the present invention comes from the cracking of dicyclopentadiene, wherein the mass fraction of cyclopentadiene is 98%, and the rest is dicyclopentadiene.
[0031] The technological process that each embodiment of the present invention adopts is as figure 1 shown. Table 1 lists the composition of the hydrogenation reaction raw material (103) in each embodiment.
[0032] Table 1
[0033]
[0034] Table 2 lists the operating conditions of the hydrogenation reactors in various embodiments of the present invention.
[0035] Table 2
[0036]
[0037] In order to illustrate the effect of the inventive method, the single-pass conversion of cyclopentadiene, the single-pass selectivity of cyclopentene and the single-pass selectivity of cyclopentane are used to represent the beneficial effect of the inventive method on the selective hydrogenation of cyclopentadiene.
[0038] Table 3 lists the single...
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The invention discloses a method for producing cyclopentene from cyclopentadiene. The method comprises the following steps: (1) a raw material containing cyclopentadiene and a solvent are mixed into a hydrogenation reaction raw material, the raw materials and hydrogen are mixed in order to carry out a fixed bed hydrogenation reaction, wherein the solvent comprises the following components in percentages by mass: 10-80% of dimethyl ether and 20-90% of diethyl ether, and the mass fraction of cyclopentadiene in the hydrogenation reaction raw materials is 1-25%, and preferably 10-25%; (2) hydrogen which is separated from hydrogenation products of the step (1) is introduced into a first rectifying tower, heavy component impurities are collected from a tower bottom, and tower top distillate which is used as a feed of a second rectifying tower is extracted; (3) the tower top distillate from the first rectifying tower in the step (2) is introduced into a second rectifying tower, cyclopentene product is collected from the tower bottom, a light component which is collected from the tower top is used as a recycled solvent, and the recycled solvent is returned to the step (1) for recycling. The method has the advantages of high conversion rate of cyclopentadiene, high yield of cyclopentene, and easy separation of the product.
Description
technical field [0001] The present invention relates to a method for producing cyclopentene from cyclopentadiene. Background technique [0002] Cyclopentene is an important fine chemical raw material, which can be used to prepare high value-added products such as cyclopentanol, cyclopentanone, glutaraldehyde, bromocyclopentane, and chlorocyclopentane. The main raw material for molecular polymers. [0003] At present, cyclopentene is mainly produced by selective hydrogenation of cyclopentadiene. Cyclopentadiene mainly comes from the by-product C5 fraction of ethylene cracking. Because at room temperature, cyclopentadiene is prone to self-polymerization reaction to generate relatively more stable dicyclopentadiene, so industrial cyclopentadiene is usually stored in dimer form. When in use, dicyclopentadiene only needs to be distilled under normal atmospheric pressure, and the distillate at the top temperature of the tower is collected at 40-44°C to obtain cyclopentadiene. ...
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IPC IPC(8): C07C13/12C07C5/05C07C7/04
Inventor 周峰马会霞乔凯
Owner CHINA PETROLEUM & CHEM CORP