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Separation method of piperylene

A separation method and technology of piperylene, applied in the direction of distillation purification/separation, organic chemistry, etc., can solve the problems of low purity of piperylene products, high equipment investment, and large operating costs, so as to improve product purity and reduce Theoretical plate number and reflux ratio, the effect of reducing equipment investment and operating costs

Active Publication Date: 2013-05-08
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0007] In order to solve the problems of high equipment investment, high operating cost, and low purity of piperylene products in the prior art separation process of piperylene, the invention provides a method for separating piperylene, which uses azeotropic distillation The method separates and obtains the piperylene product, improves the piperylene product purity, reduces equipment investment and operation cost

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Embodiment

[0033] like figure 2 As shown, the raw material 4 is taken from the pre-de-weighting tower and the de-weighting tower of the C5 separation device of a certain factory, and it is introduced into the decarbonization five-column. The main composition is: n-pentane 0.7 %, cis, trans-2-pentene 1.2%, isoprene 0.7%, cyclopentene 8.7%, piperylene 32.8%, cyclopentadiene 2.9%, dicyclopentadiene 36.3%, carbon six 14.5% %, polymer 2.2%, the flow rate is 13000kg / h. The material is introduced into the five decarburization tower 1, the number of five decarburization towers is 42, feed from 24 plates, the pressure at the top of the tower is 0.12MPa, the temperature at the top of the tower is 47°C, the pressure at the bottom of the tower is 0.14MPa, the temperature at the bottom of the tower is 106°C, The reflux ratio is 1.8. The top extraction 5 is mixed with the azeotropic stream 6, and the flow ratio of the stream 5 and the stream 6 is 0.1, and is introduced into the piperylene column 2. ...

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Abstract

The invention discloses a piperylene separation method. According to the invention, piperylene is separated through azeotropic rectification. An azeotropic material flow is introduced into a fed material of a piperylene tower. The azeotropic material flow comprises n-pentane and 2-methyl-2-butene. Flow ratio of the azeotropic material flow to a C5 removing tower top recovered material flow is 0.01-1. The two are mixed and are delivered into the piperylene tower. With the method provided by the invention, piperylene product purity is improved, equipment investment is reduced, and operation cost is reduced.

Description

technical field [0001] The invention relates to the field of chemical industry, and furthermore, relates to a method for separating piperylene. Background technique [0002] The refining process of pyrolysis C5 distillate can obtain piperylene products. According to the actual needs of the market, the product indicators must meet the following requirements: trans piperylene ≥ 42%; total content of cis piperylene and trans ≥ 65% %; cyclopentadiene (CPD) ≤ 0.8% (see Q / PHRA04-2007). [0003] In the existing C5 separation process, the piperylene and dicyclopentadiene separation unit includes a C5 distillation tower, piperylene tower and dicyclopentadiene tower. The materials from the pre-weight removal tower and the weight removal tower are sent to the carbon five distillation tower, and the top of the tower is sent to the piperylene tower. The top material of the piperylene tower is recycled back to the pre-deweighting tower, piperylene products are extracted from the side li...

Claims

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Application Information

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IPC IPC(8): C07C7/06C07C11/20
Inventor 刘智信王婧廖丽华杜春鹏李东风程建民罗淑娟过良李琰王宇飞
Owner CHINA PETROLEUM & CHEM CORP
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