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Naphtha optimized utilization method

A naphtha, fixed bed adsorption technology, applied in the petroleum industry, refined hydrocarbon oil, etc., can solve the problems of difficult to achieve the level of clear separation of molecular management, reduced economic efficiency, low ethylene yield, etc., and achieve the extension of continuous operation cycle , reduce the cost of desorption, and reduce the one-time investment of equipment

Active Publication Date: 2005-12-21
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

However, the above-mentioned patents disclose the recovery of the desorbent in the absorption oil and the desorbed oil through rectification. The energy consumption of the rectification process even exceeds the adsorption process itself, resulting in a reduction in economic efficiency. The effect of the technology to improve the utilization efficiency of oil products is seriously reduced
[0014] Chinese patent CN 1621497A discloses a method for optimizing the utilization of naphtha. This technology adopts the method of extraction and separation to separate naphtha into raffinate oil and extracted oil. The obtained extracted oil is used as the raw material of the reforming unit. Oil is used as the raw material of the ethylene cracking unit. Due to the selectivity of the extraction process, it is difficult to achieve the level of clear molecular management. The yield is significantly lower than that of n-paraffin-based raw materials

Method used

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Effect test

Embodiment 1

[0045] Straight-run naphtha with a distillation range of 50-180°C containing a mass concentration of 26.50% normal paraffins is vaporized and heated to 200°C, and the feed flow rate of the naphtha is 6kg / hour; it passes through a fixed-bed molecular sieve at a temperature of 200°C bed, 20kg5A molecular sieves are filled in the bed, the bed height is 100cm, the aspect ratio is 6: 1, the adsorption process is carried out for 30 minutes, and 2.11kg of absorption oil is obtained after condensation, and the yield is 70.4%. The alkane content is 0.30%.

[0046] After the adsorption process is over, use nitrogen to purge the bed for desorption. The nitrogen temperature is 400°C, the amount used is 1% of the naphtha treatment capacity, and the desorption time is 1 minute. The desorption airflow from the bed passes through the condenser And gas-liquid separator, obtain 0.13kg intermediate oil, yield is 4.3%, and the normal paraffin concentration in the intermediate oil is 40.1%.

[00...

Embodiment 2

[0053] Straight-run naphtha with a distillation range of 60-180°C containing a mass concentration of 26.50% normal paraffins is vaporized and heated to 200°C, and the feed flow rate of the naphtha is 6kg / hour; it passes through a fixed-bed molecular sieve at a temperature of 200°C bed, 20kg5A molecular sieves are filled in the bed, the bed height is 100cm, the aspect ratio is 6: 1, the adsorption process is carried out for 30 minutes, and 2.10kg of residual oil is obtained after condensation, and the yield is 70.3%. The alkane content is 0.30%.

[0054] After the adsorption process is over, use nitrogen to purge the bed for desorption. The nitrogen temperature is 400°C, the amount used is 10% of the naphtha treatment capacity, and the desorption time is 30 minutes. The desorption airflow from the bed passes through the condenser and a gas-liquid separator to obtain 0.87 kg of desorbed oil with a yield of 29.1%, and the content of normal paraffins in the desorbed oil is 90.4%. ...

Embodiment 3

[0059] Straight-run naphtha with a distillation range of 50-200°C containing 39.43% normal alkanes is vaporized and heated to 400°C, and the feed flow rate of naphtha is 10kg / hour; it passes through a fixed-bed molecular sieve at a temperature of 400°C bed, 30kg5A molecular sieves are filled in the bed, the bed height is 200cm, and the aspect ratio is 15:1. The adsorption process is carried out for 30 minutes, and 2.86kg of absorption oil is obtained after condensation, and the yield is 57.2%. The alkane content was 1.2%.

[0060] After the adsorption process is over, use nitrogen to purge the bed for desorption. The nitrogen temperature is 350°C, the amount used is 10% of the naphtha treatment capacity, and the desorption time is 40 minutes. The desorption airflow from the bed passes through the condenser and a gas-liquid separator to obtain 2.12 kg of desorbed oil with a yield of 42.3%, and the content of normal paraffins in the desorbed oil is 91.6%. Nitrogen is recycled. ...

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Abstract

The invention has disclosed a kind of naphtha optimizing and utilizing the method, through absorbing and separation process, the naphtha is divided into the product that including constructing the hydrocarbon and taking off encloses oil richly and including Non- is constructing the hydrocarbon and sucking unnecessary oil richly. Coming off oil as the high-quality cracked raw materials of steam or according to cut into then narrow Distill share and make into the reagent and high-quality solvent oil products. Suck unnecessary oil as the high-quality catalysis and reforming materials or the High octane pointing and cleaning petrol to well distribute the component parts. According to naphtha resource quantity and market demand situation, take the absorbing and separating craft and follow-up processing technology coupling of the naphtha in a flexible way, realize the rational disposition of resources. Advantages: simple and convenient procedure, low energy consumption and good adaptability etc...

Description

technical field [0001] The invention relates to a method for optimizing the separation and utilization of naphtha, in particular to a method for recombining and utilizing molecular sieves to adsorb and separate normal paraffins and isoparaffins in naphtha. Background technique [0002] Naphtha refers to the light fraction in crude oil from the temperature at which atmospheric distillation starts (that is, the initial boiling point) to 200°C (or 180°C), and the carbon number of its hydrocarbon composition is distributed between C 4 ~C 10 between. The main components are normal paraffins, isoparaffins, naphthenes and aromatics, wherein the content of normal paraffins is 20%-50%, and the content of non-normal hydrocarbons is 50%-80%. Through the fixed bed adsorption separation process, two products are obtained: absorption oil and desorption oil. Desorbed oil is oil rich in n-alkanes, C 4 ~C 10 The content of normal hydrocarbons is 80%-100%, and the content of non-normal h...

Claims

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Application Information

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IPC IPC(8): C10G25/03
Inventor 沈本贤刘纪昌陈晖陈洪兴陈新王桢贤凌昊
Owner EAST CHINA UNIV OF SCI & TECH
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