Production process of pentadiene

Abstract

The invention provides a manufacturing technique of pentadiene; the steps are as follows: the material is knocked out of a C5 steaming raw material tank group by a pump and enters into a C5 steaming tower for separation and distillation; the primary ingredients of pentadiene and the dicyclopentadiene in the material are separated, and the separated dicyclopentadiene and other heavy ingredients enter into a dicyclopentadiene separating tower, and the separated pentadiene and other light ingredients enter into a pentadiene separating tower; the C5 steaming raw material tank group is composed of at least two C5 steaming raw material tanks which are connected in series; the C5 steaming raw material tank group keeps the temperature of the material being 50 DEG C-100 DEG C, and keeps the pressure being 0.5MPa-1.0MPa, and the material stays in the C5 steaming raw material tank group for at least six hours. By adopting the manufacturing technique, the obtained product has high quality, the operation is simple and the existing technique equipment is only needed to be simply changed, thus realizing the purpose of the invention; in addition, the changing cost is low, and the changing effect is obvious, thus having high popularization value.

Description

technical field [0001] The invention relates to a production process of piperylene which can not only reduce the content of cyclopentadiene but also improve the production quality of piperylene, and belongs to the technical field of chemical industry. Background technique [0002] During the refining process of carbon five, piperylene products are produced. According to the actual demand of the market, the product indicators must meet the following requirements: trans piperylene ≥ 42%; cis piperylene and trans total content ≥ 65% ; Cyclopentadiene (CPD) ≤ 0.8% (see Q / PHRA04-2007). [0003] Common production process in the prior art: as figure 1 As shown, the material containing piperylene, dicyclopentadiene, a small amount of isoprene, cyclopentadiene and other small amounts of light components and heavy components is evaporated from the carbon five out of the raw material tank D1-301 through the pump P1 -301 is pumped out and enters the C5 distillation tower T1-301 for se...

AI Technical Summary

Problems solved by technology

[0006] 1. As the temperature increases, the content of cyclopentadiene (CPD) will decrease, which is beneficial to the control of cyclopentadiene (CPD) content, but the total content of piperylene will decrease, which may not reach Requirements for product indicators;

[0007] 2. The control of the return flow at the top of the tower. If the return flow is large, the light components will gradually accumulate at the top of the tower, and the relatively heavy piperylene will accumulate in the side line, which is beneficial to the collection of piperylene products. However, the inverted triangle of the cyclopentadiene (CPD) content gradient will move downward, which may cause the cyclopentadiene (CPD) content to exceed the standard. If the reflux flow is not enough, a large amount of piperylene will also appear at the top of the tower. , which has a certain impact on the collection of products;

[0008] 3. Due to the continuous operation of the previous units and the different origins of raw materials, the composition of the materials in the C5 steamed raw material tank D1-301 cannot be guaranteed to be constant, and sometimes the piperylene content will be slightly The content of cyclopentadiene (CPD) is relatively low and the content of cyclopentadiene (CPD) is slightly high, which brings considerable difficulty to the operation of the subsequent piperylene separation tower T1-302

[0009] In the case of the combination of the above reasons, it has brought considerable difficulty to the operator, and it has brought great difficulties to control the product from local fluctuations and achieve continuous product quality.

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