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Recycle hydrogen desulfurization system and method

A desulfurization system and a technology for circulating hydrogen, applied in the field of circulating hydrogen desulfurization system, can solve the problems of complex process, high energy consumption and high equipment cost

Active Publication Date: 2014-06-18
CHANGLING PETRO CHEM ENG DESIGN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Based on this, it is necessary to provide a circulating hydrogen desulfurization system with simple process, low energy consumption and low equipment cost in view of the problems of complex process, high energy consumption and high equipment cost of the traditional circulating hydrogen desulfurization system

Method used

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  • Recycle hydrogen desulfurization system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] Mix the hydrogenation reaction product from the hydrogenation reaction with 1% (mass percentage) ammonia water and enter the air cooler to cool to 55°C, then send it to the cold high-pressure separator, and perform gas-liquid phase separation in the cold high-pressure separator , the top opening of the cold high-pressure separator discharges the desulfurization circulating hydrogen, the middle opening discharges the oil product, and the bottom opening discharges the acidic aqueous solution of ammonium hydrogen sulfide, in which the desulfurization circulating hydrogen contains H 2 S content <500ppm.

[0087] Pass the above-mentioned ammonium hydrogen sulfide acidic aqueous solution into the cold feed cooler to cool to 40°C, and transport it to the stripping tower. A reboiler is installed at the bottom of the stripping tower to provide heat source, and it is discharged from the top outlet of the stripping tower through rectification. Hydrogen sulfide, ammonia gas is disc...

Embodiment 2

[0091] Mix the hydrogenation reaction product from the hydrogenation reaction with 5% (mass percent) ammonia water and enter the air cooler to cool to 45°C, then transport it to the cold high-pressure separator, and perform gas-liquid phase separation in the cold high-pressure separator , the top opening of the cold high-pressure separator discharges the desulfurization circulating hydrogen, the middle opening discharges the oil product, and the bottom opening discharges the acidic ammonium hydrogen sulfide aqueous solution, in which the desulfurization circulating hydrogen contains H 2 S content <500ppm.

[0092] After passing the above-mentioned acidic ammonium hydrogen sulfide aqueous solution through the second heat exchanger and the first heat exchanger in turn for heat exchange, it is transported to the stripping tower, and a reboiler is provided at the bottom of the stripping tower to provide a heat source, and through rectification in the stripping tower Hydrogen sulfi...

Embodiment 3

[0096] Mix the hydrogenation reaction product from the hydrogenation reaction with 0.1% (mass percentage) ammonia water and enter the air cooler to cool to 50°C, then transport it to the cold high-pressure separator, and perform gas-liquid phase separation in the cold high-pressure separator , the top opening of the cold high-pressure separator discharges the desulfurization circulating hydrogen, the middle opening discharges the oil product, and the bottom opening discharges the acidic ammonium hydrogen sulfide aqueous solution, in which the desulfurization circulating hydrogen contains H 2 S content <500ppm.

[0097] Pass part of the above-mentioned ammonium hydrogen sulfide acidic aqueous solution into the cold feed cooler to cool to 40 ° C, and the other part passes through the second heat exchanger and the first heat exchanger in turn for heat exchange, and then transports it to the stripping tower, and the stripping tower A reboiler is provided at the bottom to provide a...

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Abstract

The invention provides a recycle hydrogen desulfurization system. The system comprises a recycle hydrogen desulfurizing device, an acidic water steam stripping device and an ammonia water circulating device, wherein the recycle hydrogen desulfurizing device is used for mixing a hydrogenation reaction product with ammonia water of which the content in mass percentage is 0.1%-5% for reaction, and separating out desulfurized recycle hydrogen and ammonium hydrosulfide acidic water solution; the acidic water steam stripping device is connected with the recycle hydrogen desulfurizing device and used for further rectifying the ammonium hydrosulfide acidic water solution separated out by the recycle hydrogen desulfurizing device so as to separate out hydrogen sulfide, ammonia gas and water; the ammonia water circulating device is respectively connected with the acidic water steam stripping device and the recycle hydrogen desulfurizing device and used for mixing the ammonia gas and the water separated out by the acidic water steam stripping device and then preparing the ammonia water of which the content in mass percentage is 0.1%-5%, and the ammonia water is supplied to the recycle hydrogen desulfurizing device and used as the ammonia water for a mixing reaction with the hydrogenation reaction product. The invention also provides a recycle hydrogen desulfurization method. The recycle hydrogen desulfurization system and the recycle hydrogen desulfurization method are simple in process, low in power consumption and also low in equipment cost.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a circulating hydrogen desulfurization system and method. Background technique [0002] At present, there are many domestic gasoline and diesel hydrofinishing and wax oil hydrocracking units. Usually, the nitrogen compounds and sulfides contained in raw oil will generate hydrogen sulfide and ammonia after hydrogenation reaction, and this part of the gas will be recycled in hydrogen Accumulated in the middle, thereby reducing the hydrogen concentration of circulating hydrogen and reducing the efficiency of desulfurization and denitrification. The traditional MDEA (N-methyldiethanolamine) solution wet desulfurization requires the installation of a high-pressure circulating hydrogen desulfurization tower, and because the MDEA solution is easy to foam with the oil in the circulating hydrogen, it is necessary to install a high-pressure dehydrogenation tower before the circulating...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G45/02
Inventor 杨培志李根忠
Owner CHANGLING PETRO CHEM ENG DESIGN
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