Two-stage hydrocarbon hydrogenation method with serial high-pressure parts

Abstract

The invention relates to a two-stage hydrocarbon hydrogenation method with serial high-pressure parts. First-stage hot high-pressure separator oil and a first-stage hot high-pressure separator gas are obtained from a first-stage hydrogenation reaction effluent by a first-stage high-pressure separation part; a first-stage cold high-pressure separator gas and first-stage cold high-pressure separator oil are obtained from the first-stage hot high-pressure separator gas by the first-stage cold high-pressure separation part; the first-stage hot high-pressure separator oil and the first-stage cold high-pressure separator gas enter a second-stage hydrogenation reaction part; a second-stage cold high-pressure gas and second-stage cold high-pressure separator oil are obtained from a second-stage hydrogenation reaction effluent by a second-stage cold high-pressure separation part; and at least part of the second-stage cold high-pressure separator gas is circularly returned to the first-stage hydrogenation reaction part. The method has the remarkable effects of reducing the total amount of recycle hydrogen, simplifying process and reducing investment, and is particularly suitable for the process of producing diesel oil from anthracene oil by a two-stage hydrocracking method.

Description

technical field [0001] The present invention relates to a kind of two-stage method hydrocarbon hydrogenation method of high-pressure partial series connection; In particular, the present invention relates to a kind of high-pressure partial series-connected two-stage method hydrocarbon hydrogenation method of high-nitrogen, high-aromatic oil; more particularly the present invention relates to a The invention relates to a two-stage method for producing diesel oil components by hydrorefining first and then hydrocracking of anthracene oil, and the high-pressure part is a series process. Background technique [0002] Using anthracene oil as raw material, the process of producing diesel components by the two-stage method of first hydrofining and then hydrocracking has the following characteristics: [0003] ①The hydrocarbon components in the oil produced by hydrofining of anthracene oil (the oil produced by one-stage hydrotreating) have a conventional boiling point higher than 200...

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Problems solved by technology

[0004] ②The proportion of fractions with a conventional boiling point higher than 200°C in the hydrorefined anthracene oil is generally greater than 85%, usually greater than 90%, and these components usually need to go through a hydrocracking process before they can be converted into expected diesel components , at this time, the ratio of the volume flow rate of the hydrocracking feed oil to the volume flow rate of the hydrorefining feed oil is roughly 1; That is to say, the ratio of the amount of hydrogen-containing gas at the inlet of the first reactor in the cracking section to the amount of cold high-fraction gas in the refining section is roughly 1; In the cold high-fraction water of the hydrogenated refrigeration high-pressure separator, the ammonia content in the hydrogenated refined refrigeration high-separation gas is very small, and the hydrogenated refined refrigeration high-separation gas can be directly introduced into the high-pressure part of the hydrocracking process, almost doubling the reduction of circulating hydrogen The total amount; in the conventional process of the two-stage anthracene oil hydrocracking process, the hydrogen circulation route of the refining section and the hydrogen circulation route of the cracking section are in a parallel relationship. One of the disadvantages is that the total amount of circulating hydrogen is large, and the circulating hydrogen compressor part Equipment and pipelines are large in size and high in investment, and reducing the total amount of circulating hydrogen can reduce the investment in this part of the facility;

[0005] ③In the conventional process of the two-stage anthracene oil hydrocracking process, the hydrogen circulation route in the refining section and the hydrogen circulation route in the cracking section are connected in parallel. One of the disadvantages is that the pressure drop of the hydrogen circulation route in the refining section is much larger than that in the cracking section. The pressure drop of the route (compared with the catalyst bed in the cracking section, the catalyst loading amount in the refining section is larger, the amount of metal deposition is larger, and the coking speed is faster). The work efficiency is low, resulting in huge ineffective energy consumption, and the refining section and the cracking section form a hydrogen series process, which can avoid the above shortcomings;

[0008] The known two-stage hydrocarbon hydrogenation method (including the inventor's following prior patent application documents related to the concept of hydrogenation of anthracene oil) does not involve a section of hot high-separation oil and a section of cold high-separation gas entering the second-stage reaction part in series at the same time Two-stage Hydrocarbon Hydrogenation Process

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