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Water injection ammonia absorption method for high-nitrogen low-sulfur hydrocarbon hydrogenation treatment reaction effluent

A technology for hydrotreating and effluent, applied in hydrotreating process, treating hydrocarbon oil, petroleum industry, etc.

Inactive Publication Date: 2015-12-09
朱广英
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The purpose of the present invention is to propose a method for absorbing ammonia by injecting water into the reaction effluent of high-nitrogen and low-sulfur hydrocarbon hydrotreating, and no similar technology has been reported

Method used

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  • Water injection ammonia absorption method for high-nitrogen low-sulfur hydrocarbon hydrogenation treatment reaction effluent

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Experimental program
Comparison scheme
Effect test

Embodiment approach

[0129] ① Plan A, it can be arranged to mix with water in the pipeline for transporting cold high-separation gas to complete the water ammonia absorption process, and then complete the gas-liquid separation in the gas-liquid separator (such as the liquid separation tank at the inlet of the circulating hydrogen compressor), that is, relying on the circulation The liquid separation tank at the inlet of the hydrogen compressor implements the present invention;

[0130] ②Program B, water ammonia absorption and its separation process can be arranged in a special water ammonia absorption tower for cold high-separation gas; the second water ammonia absorption process can use trays or packing, and can be carried out once, twice or Multiple countercurrent exposures;

[0131] ③The improvement of scheme B, combining the cold high-separator and the water ammonia absorption tower to form a combined equipment SAV, the container SAV contains the cold high-pressure separation space R1PSV and t...

Embodiment 1

[0152] The properties of medium-temperature coal tar and its distillate oil are shown in Table 1. The medium-temperature coal tar is separated into a distillate oil (R1F) with a weight yield of 87-88% and a weight yield of 12% mainly composed of hydrocarbons with conventional boiling points higher than 500°C. ~13% coal tar pitch.

[0153] Adopt technical scheme of the present invention, process step is as follows:

[0154] (1) In the hydrogenation reaction part R1, in the presence of hydrogen and catalyst R1C, 20 tons / hour of high-nitrogen and low-sulfur hydrocarbon R1F is subjected to a hydrotreating reaction to remove at least a part of organic nitrogen, and is converted into a hydrogenation reaction part The reaction product R1P; the operating conditions of the hydrogenation reaction part R1 are: temperature is 250-410°C, pressure is 16.5-17.5MPa, and the volume space velocity of the hydrogenation catalyst R1C is 0.25hr -1 (of which the protective agent 0.5hr -1, Hydrofin...

Embodiment 2

[0166] Based on Embodiment 1, the second water ammonia absorption step is arranged to be carried out in a special water ammonia absorption tower for cold and high-separation gas, using 6 tray materials, and through 6 countercurrent contacts; the ammonia volume of the cold high-separation gas HPVDN The content is lower than 20-30ppm.

[0167] If the traditional hydrogenation reaction effluent water injection ammonia absorption step is used to carry out the single-stage water absorption ammonia method, even if the amount of solvent water W1 increases to 6.60 tons / hour, it increases to 2.00 times, and the ammonia volume content in the circulating hydrogen is also higher than 80ppm.

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Abstract

The invention relates to a water injection ammonia absorption method for high-nitrogen low-sulfur hydrocarbon hydrogenation treatment reaction effluent. A conventional water injection ammonia absorption step for hydrogenation reaction effluent is employed as the first ammonia absorption step; a cold high-fraction gas water injection ammonia absorption step is added as the second ammonia absorption step; ammonia-rich water discharged by the second ammonia absorption step enters the first ammonia absorption step for second use as solvent water, and in a general water injection ammonia absorption process of the reaction effluent gas, the first and the second ammonia absorption steps form a parallel flow or backflow series relationship. The second ammonia absorption step can be executed at the upper part of a cold high separator or in a water injection ammonia absorption tower special for the cold high-fraction gas, and mixed absorption can also be implemented in a pipeline for delivering the cold high-fraction gas for gas-liquid separation in a gas-liquid separator (such as a liquid separation tank of a circulating hydrogen compressor). According to the method, the using amount of the solvent water can be reduced, and the flow of acidic water can be greatly reduced, namely the scale of an acidic water purification device can be reduced, and the method is suitable for the modification of an existing device.

Description

technical field [0001] The invention relates to a method for absorbing ammonia by injecting water into the reaction effluent of high-nitrogen and low-sulfur hydrocarbon hydrogenation treatment. The traditional hydrogenation reaction effluent water injection and ammonia absorption step is used as the first ammonia absorption step, and the cold and high-separation gas water is added to absorb ammonia. The step is used as the second ammonia absorption step, and the rich ammonia water discharged from the second ammonia absorption step enters the first ammonia absorption step and is used as solvent water for secondary use. In the overall water ammonia absorption process of the reaction effluent gas, the first and second absorption The ammonia steps can be in a co-current or counter-current series relationship. The second ammonia absorption step can be arranged on the upper part of the cold high-pressure separator, or it can be arranged in a special water ammonia absorption tower fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/02
Inventor 朱广英
Owner 朱广英