Method for preparing light-weight aromatic hydrocarbon through aromatizing waste edible oil

A technology for discarding edible oil and light aromatic hydrocarbons, which can be applied in chemical instruments and methods, hydrocarbon production from oxygen-containing organic compounds, and hydrocarbon production by condensation between hydrocarbons and non-hydrocarbons. The problem of high energy consumption is to improve the equilibrium yield of aromatic hydrocarbons, reduce environmental pollution and improve the yield of aromatic hydrocarbons.

Inactive Publication Date: 2018-09-04
HUAIYIN TEACHERS COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent has the following defects: (1) It is a vacuum pyrolysis process, which is an intermittent operation. After each production of a kettle of products, the temperature must be lowered to separate the catalyst before adding raw materials and then heating up. It is not suitable for large-scale production
(2) During the reaction process, the contact time between the waste oil and the catalyst is too long, which will easily lead to further coking and carbonization of the generated aromatics, which reduces the yield of aromatics and shortens the service life of the catalyst
(3) Operate under vacuum, the scope of application is narrow, and the energy consumption is also high
(4) The gas products obtained by the reaction are not recycled, but directly discharged, which will reduce the yield of aromatics on the one hand, and easily cause environmental pollution on the other hand
(5) It directly mixes the liquid-phase oil with the solid-state catalyst and then warms the reaction (cold feed), which will lead to a large amount of oxygen-containing compounds in the aromatization product, and the oxygen atoms in the oil molecules are basically formed as oxygen-containing carbides. in the liquid phase product, resulting in lower yields of aromatics

Method used

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  • Method for preparing light-weight aromatic hydrocarbon through aromatizing waste edible oil
  • Method for preparing light-weight aromatic hydrocarbon through aromatizing waste edible oil
  • Method for preparing light-weight aromatic hydrocarbon through aromatizing waste edible oil

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]1) After preheating the pure waste cooking oil at 350°C, pump it into a fixed bed reactor filled with HZSM-5 molecular sieve catalyst, operate under normal pressure, and operate at a reaction temperature of 500°C and a mass space velocity of 1.20h -1 The reaction is carried out under certain conditions, and it is converted into aromatic hydrocarbon-based products through catalytic conversion;

[0029] 2) The above reaction products are condensed and separated to obtain gas phase products, liquid phase oil phase products and liquid phase water, liquid phase oil phase products are separated by diethylene glycol extraction and distillation to obtain aromatics and non-aromatics, gas phase products and non-aromatic components in the oil phase Return to the reactor to continue the reaction.

Embodiment 2

[0031] 1) Mix the waste cooking oil with water, methanol, ethanol, n-propanol, isopropanol and isobutanol at a ratio of 15% of the waste cooking oil mass concentration, heat and vaporize at 350°C, and then pump it into a container filled with HZSM -5 molecular sieve catalyst in a fixed bed reactor, operated under normal pressure, at a reaction temperature of 500°C and a mass space velocity of 1.20h -1 The reaction is carried out under certain conditions, and it is converted into aromatic hydrocarbon-based products through catalytic conversion;

[0032] 2) The above reaction products are condensed and separated to obtain gas phase products, liquid phase oil phase products and liquid phase water. The liquid phase oil phase products are extracted and distilled through sulfolane to obtain aromatics and non-aromatics. The gas phase products and non-aromatic components in the oil phase are returned to The reactor continues to react.

[0033] The reaction result of embodiment 1 and ...

Embodiment 3

[0038] 1) Mix waste cooking oil and isopropanol at a ratio of 20% waste cooking oil mass concentration, preheat at 400°C and pump them into Molecular sieve catalyst in a fixed-bed reactor, operated under normal pressure, at a reaction temperature of 500°C and a mass space velocity of 1.00h -1 The reaction is carried out under certain conditions, and it is converted into aromatic hydrocarbon-based products through catalytic conversion;

[0039] 2) The above reaction products are condensed and separated to obtain gas phase products, liquid phase oil phase products and liquid phase water, and liquid phase oil phase products are extracted and distilled by N-methylpyrrolidone to obtain aromatic hydrocarbons and non-aromatic hydrocarbons, gas phase products and oil phase The non-aromatic components are returned to the reactor to continue the reaction.

[0040] The reaction results are compared in Table 2.

[0041] Table 2

[0042]

[0043] It can be seen from Table 2 that the ...

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PUM

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Abstract

The invention discloses a method for preparing light-weight aromatic hydrocarbon through aromatizing waste edible oil. The method comprises the following steps: (1) taking the waste edible oil or mixing the waste edible oil with a solvent; after pre-heating and gasifying, conveying a mixture into a fixed bed reactor filled with a catalyst and reacting; (2) condensing and separating a reaction product obtained by step (1) to obtain the aromatic hydrocarbon. According to the method disclosed by the invention, almost obtained aromatized products are the aromatic hydrocarbon and only contain traceoxygen-containing compounds; oxygen atoms in grease molecules are basically transformed into a form of water or carbon dioxide, so that the water is removed only through adopting a solvent extractionor extraction and distillation method, and an aromatic hydrocarbon product can be obtained; the method belongs to continuous operation and is suitable for industrial large-scale production.

Description

technical field [0001] The invention relates to a method for preparing light aromatics, in particular to a method for preparing light aromatics by aromatizing waste cooking oil. Background technique [0002] Edible oil is indispensable in people's daily diet, but it will inevitably produce a large number of waste edible oil after use. According to statistics, the output of waste cooking oil in China is as high as 5 million tons per year. At present, there is no effective utilization of waste cooking oil in the world. This has led to the stimulation of economic interests, many people have learned to "make the best use of everything" and reprocess it into cooking oil through local methods, so as to achieve the goal of shaming. level, seriously endangering human health. In addition, waste cooking oil will also enter rivers and lakes along with the urban drainage network, causing a large number of organic matter to grow, causing environmental pollution problems such as blue-gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/86C07C1/20C07C15/04C07C15/06C07C15/08
CPCC07C1/20C07C2/862C07C2529/08C07C2529/40C07C2529/44C07C2529/70C07C2529/76C07C15/04C07C15/06C07C15/08
Inventor 王飞褚效中赵宜江徐继明李乔琦吴飞跃朱凤霞蒋梦婷
Owner HUAIYIN TEACHERS COLLEGE
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