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A kind of depolymerization technique of dicyclopentadiene

A technology of dicyclopentadiene and cyclopentadiene, which is applied in the field of depolymerization of dicyclopentadiene, can solve problems such as coking blockage, product yield and purity impact, and achieve coking suppression, yield and purity improvement, The effect of suppressing generation

Active Publication Date: 2019-09-13
YANGPU AOLI PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the self-polymerization of dicyclopentadiene in the high-temperature cracking process, coking and blockage will be formed due to self-polymerization, and impurities will be produced by side reactions, which will have a negative impact on the yield and purity of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A dicyclopentadiene depolymerization process, using dicyclopentadiene as a raw material, comprising the following operations: first add a diluent and a polymerization inhibitor to the raw material and mix evenly, let stand for 30 minutes, and then decompose in a reactive distillation tower Separation by polyrectification, control the temperature of the tower tank at 240-248°C, the temperature at the top of the tower at 41-43°C, the pressure at the top of the tower at 12-13KPaG, the reflux ratio at 6, the feed rate at 8mL / min, and collect at the top of the tower cyclopentadiene.

[0020] The diluent is composed of n-hexadecane and n-hexane in a mass ratio of 8:1, and the raw material is diluted to a mass fraction of 40%.

[0021] The polymerization inhibitor is composed of hydroquinone, o-nitrophenol and aniline in a mass ratio of 4:9:1, and the added amount is 0.008% of the mass of the raw material before dilution.

Embodiment 2

[0023] A depolymerization process of dicyclopentadiene, using dicyclopentadiene as a raw material, comprising the following operations: first adding a diluent and a polymerization inhibitor to the raw material and mixing them uniformly, standing for 60 minutes, and then performing depolymerization in a reactive distillation tower Separation by polyrectification, control the temperature of the tower tank at 262-270°C, the temperature at the top of the tower at 41-43°C, the pressure at the top of the tower at 18-19KPaG, the reflux ratio at 10, the feed rate at 15mL / min, and collect at the top of the tower cyclopentadiene.

[0024] The diluent is composed of n-hexadecane and n-hexane with a mass ratio of 5:3, and the raw material is diluted to a mass fraction of 60%.

[0025] The polymerization inhibitor is composed of hydroquinone, o-nitrophenol and aniline in a mass ratio of 7:14:3, and the added amount is 0.015% of the mass of the raw material before dilution.

Embodiment 3

[0027] A dicyclopentadiene depolymerization process, using dicyclopentadiene as a raw material, comprising the following operations: first adding a diluent and a polymerization inhibitor to the raw material and mixing them uniformly, standing for 40 minutes, and then depolymerizing in a reactive distillation tower Separation by polyrectification, control the temperature of the tower tank at 252-260°C, the temperature at the top of the tower at 41-43°C, the pressure at the top of the tower at 15-16KPaG, the reflux ratio at 8, the feed rate at 10mL / min, and collect at the top of the tower cyclopentadiene.

[0028] The diluent is composed of n-hexadecane and n-hexane with a mass ratio of 7:2, and the raw material is diluted to a mass fraction of 53%.

[0029] The polymerization inhibitor is composed of hydroquinone, o-nitrophenol and aniline in a mass ratio of 5:11:1, and the added amount is 0.011% of the mass of the raw material before dilution.

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Abstract

The present invention provides a depolymerization process of dicyclopentadiene. With dicyclopentadiene as a raw material, a diluent and a polymerization inhibitor are added to the raw material and mixed uniformly, and then subjected to depolymerization rectification separation in a reactive distillation tower after still standing for 30-60 minutes, under controlled conditions as follows: a tower bottom temperature of 240-270 DEG C, a tower top temperature of 40-45 DEG C, a tower top pressure of 12-17 KPaG, a reflux ratio of 6-10, and a feed rate of 8-15 mL / min; and cyclopentadiene is collectedat the top of the tower. The depolymerization process provided by the present invention, by adding a diluent and a polymerization inhibitor which are scientifically proportioned and controlling reaction conditions, realizes effective inhibition of the occurrence of self-polymerization and side reactions during pyrolysis, and inhibits the occurrence of coking simultaneously, thus improving the yield and purity of cyclopentadiene.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a depolymerization process of dicyclopentadiene. Background technique [0002] Cyclopentadiene is the main raw material for the preparation of MMT. The full name of MMT is methylcyclopentadiene trihydroxy manganese. It is an excellent antiknock agent for unleaded gasoline and a substitute for tetraethyl lead. Dicyclopentadiene is a dimer of cyclopentadiene. Dicyclopentadiene mainly comes from the by-products of petroleum cracking. The C5 fraction with naphtha or light diesel as cracking raw materials has a high yield and is a colorless crystal at room temperature. , It is a light yellow oily liquid when it contains impurities, has a camphor smell, is soluble in most organic solvents, depolymerizes into cyclopentadiene at high temperature, and easily self-polymerizes into dicyclopentadiene at room temperature. Due to the self-polymerization phenomenon of dicyclopentadiene in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C4/22C07C7/20C07C13/15
CPCY02P20/10
Inventor 郭银亮胡君
Owner YANGPU AOLI PETROCHEM
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