Method for preparing dicyclopentadiene through gas-liquid phase depolymerization of C9 raw material

A technology for dicyclopentadiene and raw materials is applied in the field of preparing dicyclopentadiene by gas-liquid phase depolymerization of carbon nine raw materials, and can solve the problems of easy polymerization of crude dicyclopentadiene raw materials, large material loss, low conversion rate and the like , to reduce the depolymerization residence time, reduce production energy consumption, and achieve the effect of high conversion rate

Active Publication Date: 2016-03-16
HENGHE MATERIALS & SCI TECH CO LTD
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Problems solved by technology

[0006] The present invention proposes a new method for preparing dicyclopentadiene through gas-liquid phase depolymerization of C9 raw materials, so as to solve the defects of easy polymerization and low conversion rate of crude dicyclopentadiene raw materials in liquid phase depolymerization, and the problem of gas-liquid depolymerization. - Disadvantages such as high energy consumption and large material loss in the industrialization of liquid phase depolymerization

Method used

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  • Method for preparing dicyclopentadiene through gas-liquid phase depolymerization of C9 raw material

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Embodiment 1

[0045] The C9 raw material is cut by vacuum rectification to obtain a thermal depolymerization raw material with a distillation range of 150-190 ° C. The composition is: cyclopentadiene 1.5%, styrene 1.0%, vinyltoluene 25.0%, β-DCPD 4.0% , α-DCPD45.0%, indene 3.0%, and the rest are various saturated aromatic hydrocarbons. The thermal depolymerization raw material is preheated to 155°C and transported into the middle of the depolymerization kettle R1; the thermal depolymerization raw material is depolymerized in the liquid phase at 210°C and the operating pressure is 0.11Mpa in the depolymerization kettle, and the gasified material is in the upper part of the depolymerization kettle The heater is heated to 270°C by medium-temperature heat-conducting oil to obtain gas-phase cyclopentadiene-enriched material. The composition is: cyclopentadiene 63.0%, styrene 1.5%, vinyl toluene 12.5%, β-DCPD 4.0%, α -DCPD 15.0%, indene 1.0%, and the rest are various saturated aromatic hydrocarbo...

Embodiment 2

[0047] The C9 raw material is cut by vacuum rectification to obtain a thermal depolymerization raw material with a distillation range of 150-190 ° C. The composition is: cyclopentadiene 1.6%, styrene 0.7%, vinyltoluene 24.6%, β-DCPD 3.5% , α-DCPD53.5%, indene 3.5%, and the rest are various saturated aromatic hydrocarbons. The thermal depolymerization raw material is preheated to 140°C and transported into the middle of the depolymerization kettle R1; the thermal depolymerization raw material is depolymerized in the liquid phase at 220°C and the operating pressure is 0.12Mpa in the depolymerization kettle, and the gasified material is heated in the upper part of the depolymerization kettle The gas-phase cyclopentadiene-enriched material was obtained by heating to 270°C with medium-temperature heat-conducting oil, and the composition was: cyclopentadiene 72.0%, styrene 1.0%, vinyl toluene 11.0%, β-DCPD 3.0%, α- 12.5% ​​DCPD, 0.5% indene, and the rest are various saturated aromat...

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Abstract

The invention relates to a method for preparing dicyclopentadiene through gas-liquid phase depolymerization of a C9 raw material. The method comprises the following steps: carrying out reduced pressure rectification division on the C9 raw material to obtain a thermal depolymerization raw material, preheating the thermal depolymerization raw material, and conveying the preheated thermal depolymerization raw material into a depolymerization kettle R1; carrying out liquid phase to obtain a gasification material, and carrying out a gas phase depolymerization reaction on the gasification material in the upper portion of the depolymerization kettle to obtain a gas phase depolymerization material; adding the gas phase depolymerization material to a tubular heater, heating, carrying out gas phase depolymerization, adding the obtained material to a cooling heat exchanger, carrying out heat exchange to cool in order to obtain a gas phase material and a liquid phase material, allowing the gas phase material and the liquid phase material to enter a rectifying tower T1, obtaining CPD at the top of the rectifying tower T1, allowing CPD to enter a dimerization reactor R2, and dimerizing to obtain DCPD; and allowing the DCPD to enter a rectifying tower T2, carrying out reduced pressure recitification, removing light fraction from the top of the rectifying tower T2, and removing heavy fraction from the bottom of the rectifying tower T2 to obtain dicyclopentadiene. The method has the advantages of advanced process, high conversion rate of the C9 raw material for preparing the DCPD, full recycling of system waste heat, and suitableness for industrial application, and the purity of the obtained DCPD product is not lower than 99%.

Description

technical field [0001] The invention belongs to the field of preparation of dicyclopentadiene, in particular to a method for preparing dicyclopentadiene through gas-liquid phase depolymerization of carbon nine raw materials. Background technique [0002] Dicyclopentadiene is a product obtained by dimerization of cyclopentadiene. Both cyclopentadiene and dicyclopentadiene have active conjugated double bond structures, and are widely used in pesticides, resins, rubber, medicine and other fields. The polymer grade dicyclopentadiene with a purity greater than 98.5wt% can be used as a raw material for the production of medicine, cosmetics, cyanocene compounds and rubber. [0003] Dicyclopentadiene and its monomers are mainly derived from C5 and C9 fractions produced by ethylene cracking. The invention uses cracked carbon nine as raw material, and the content of dicyclopentadiene in it is generally 15-30wt%. The cracked C9 fraction is very complex, containing hundreds of compon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/50C07C13/61
CPCC07C2/50C07C4/22C07C13/61C07C13/15
Inventor 王斌孙向东徐迪静陈亚东李爱元
Owner HENGHE MATERIALS & SCI TECH CO LTD
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