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Method for preparing cyclopentane from ethylene cracking C9 heavy fraction

A technology for ethylene cracking and cyclopentane, which is applied in chemical instruments and methods, hydrogenation to hydrocarbons, metal/metal oxide/metal hydroxide catalysts, etc., can solve dicyclopentadiene polymerization loss and cyclopentane yield Low cost, reactor coking and clogging, etc., to achieve the effects of increased yield, simple operation and low cost

Inactive Publication Date: 2013-01-02
NINGBO POLYTECHNIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When dicyclopentadiene is used for depolymerization, a large amount of dicyclopentadiene will be lost due to polymerization, and it will also cause coking and blockage of the reactor
The yield of cyclopentane is low, only about 80%

Method used

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  • Method for preparing cyclopentane from ethylene cracking C9 heavy fraction
  • Method for preparing cyclopentane from ethylene cracking C9 heavy fraction
  • Method for preparing cyclopentane from ethylene cracking C9 heavy fraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The heavy distillate of C9 raw materials is preheated to 120°C by the preheater E1 and then enters the depolymerization tank R1 for depolymerization. The depolymerization temperature is 170°C, the system operating pressure is 0.05MPa, and the residence time is 1.5h; the generated gas phase material F2 Enter the depolymerization tower T1, the temperature at the top of the tower is 70°C, the temperature at the bottom of the tower is at 200°C, the operating pressure is 0.03MPa, the reflux ratio is 0.5, the mixture of crude cyclopentadiene and crude methylcyclopentadiene obtained at the top of the tower Material F3, the gas phase enters the monomer separation tower T2, the top of the monomer separation tower is 40°C, the temperature of the tower kettle is 140°C, the system pressure is 0.05MPa, the reflux ratio is 2, and the high-purity cyclopentadiene obtained at the top of the tower is After being cooled by the cooler E2, it enters the mixing tank V1, mixes it with the tert...

Embodiment 2

[0045] The heavy fraction of C9 raw material is preheated to 130°C by the preheater E1, and then enters the depolymerization tank R1 for depolymerization. The depolymerization temperature is 220°C, the system operating pressure is 0.10MPa, and the residence time is 2h; Depolymerization tower T1, the temperature at the top of the tower is 100°C, the temperature at the bottom of the tower is 210°C, the operating pressure is 0.2MPa, the reflux ratio is 2, the mixture of crude cyclopentadiene and crude methylcyclopentadiene obtained at the top of the tower F3, the gas phase enters the monomer separation tower T2, the top of the monomer separation tower is 50°C, the temperature of the tower kettle is 150°C, the system pressure is 0.10MPa, the reflux ratio is 3, and the high-purity cyclopentadiene obtained at the top of the tower is passed through After being cooled by the cooler E2, it enters the mixing tank V1, mixes it with the ethanol solvent at a mass ratio of 1:7 and the hydrog...

Embodiment 3

[0048] The heavy fraction of C9 raw material is preheated to 150°C by the preheater E1 and then enters the depolymerization tank R1 for depolymerization. The depolymerization temperature is 200°C, the system operating pressure is 0.2MPa, and the residence time is 3h; Depolymerization tower T1, the temperature at the top of the tower is 100°C, the temperature at the bottom of the tower is at 220°C, the operating pressure is 0.3MPa, the reflux ratio is 3, the mixture of crude cyclopentadiene and crude methylcyclopentadiene obtained at the top of the tower F3, the gas phase enters the monomer separation tower T2, the top of the monomer separation tower is 60°C, the temperature of the tower kettle is 160°C, the system pressure is 0.08MPa, the reflux ratio is 4, and the high-purity cyclopentadiene obtained at the top of the tower is passed through Cooler E2 cools and enters mixing tank V1, mixes with tert-amyl alcohol solvent at a mass ratio of 1:7 and hydrogen at a molar ratio of 1...

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Abstract

The invention relates to a method for preparing cyclopentane from an ethylene cracking C9 heavy fraction. The method comprises the following steps: 1, preheating the ethylene cracking C9 heavy fraction, and depolymerizing to obtain a gas phase material; 2, depolymerizing the gas phase material to obtain crude methylcyclopentadiene and crude cyclopentadiene at the tower top; 3, carrying out monomer separation refining of the crude cyclopentadiene and the crude methylcyclopentadiene to obtain high-purity cyclopentadiene at the tower top; and 4, mixing the high-purity cyclopentadiene with a solvent and hydrogen, allowing the obtained mixture to enter a fixed bed catalyst bed layer, and carrying out a catalytic hydrogenation reaction. The preparation method provided by the invention, which adopts the cracking C9 heavy fraction as a depolymerization raw material, has the advantages of low cost, low equipment requirement, and suitableness for large-scale production; and in the invention, the cyclopentadiene yield is greater than 95%, the cyclopentadiene conversion rate is about 100%, the cyclopentane selectivity is greater than 99%, the cyclopentane yield is greater than 95%, and the purity of the obtained cyclopentane is greater than 99%.

Description

technical field [0001] The invention belongs to the field of preparation of cyclopentane, in particular to a method for preparing cyclopentane from ethylene cracking carbon nine-heavy fraction. Background technique [0002] Cyclopentane, as a new type of foaming agent for rigid polyurethane foam, is used to replace chlorofluorocarbons (CFCS), which have a damaging effect on the atmospheric ozone layer. It has been widely used in the production of fluorine-free refrigerators, freezers, cold storage, and pipeline insulation. and other fields. With the prohibition stipulated in Montreal and other conventions and the approaching of the ODS deadline, CFCS and HCFCS products will soon be banned, and cyclopentane will surely become the protagonist in the field of polyurethane foaming agents. Its reaction formula is as follows: [0003] [0004] Chinese patents CN1321625A, CM1417178A, and CN1911875A all disclose the preparation method of cyclopentadiene produced by depolymeriza...

Claims

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Application Information

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IPC IPC(8): C07C13/10C07C5/03B01J23/83
Inventor 李来福李海涛王斌孙向东
Owner NINGBO POLYTECHNIC
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