Reverse feed high-aromatic-hydrocarbon hydro-upgrading method

Abstract

A reverse feed high-aromatic-hydrocarbon hydro-upgrading method includes the steps that high-aromatic-hydrocarbon BF such as low-temperature coal tar serves as quenching oil for recovering reaction heat to make direct contact with high-temperature gas-phase-contained material flow R10PVX based on first hydrogenation reaction outflow matter R10P in the high-pressure separation process, at least one time of contact is completed so that part of light components in the raw material hydrocarbon BF can be gasified and separated into gas S1V and liquid material flow S1L possibly containing solid, the material flow S1L or material flow S1LPX obtained after high-carbon-residue components are removed from the material flow S1L enters the first hydrogenation reaction process R10 to be subjected to hydrogenation thermal cracking reaction to be converted into R10P, R10P can enter the previous separation step BS first to be separated into gas BSV and liquid material flow BSL possibly containing solid, at least part of the material flow BSL can return to the step R10 so that circulation conversion and catalyst circulation can be achieved, and the material flow containing solid in the step R10 or the step BS is used for discharging waste catalysts.

Description

Technical field [0001] A reverse feed high-aromatics hydro-upgrading method. In the high-pressure separation process S1, high-aromatics BF such as medium and low temperature coal tar acts as a quench oil for recovering reaction heat and directly contacts the high-temperature content based on the first hydrogenation reaction effluent R10P The gaseous stream R10PVX completes at least one contact to realize the vaporization and separation of part of the light components in the raw hydrocarbon BF into gas S1V and liquid stream S1L that may contain solids. The stream S1L or stream S1L is removed from the high residual carbon components. The stream S1LPX enters the first feeder The hydrogen reaction process R10 performs the hydrothermal cracking reaction to convert into R10P. R10P can first enter the pre-separation step BS to be separated into gas BSV and a liquid stream BSL that may contain solids. At least a part of the stream BSL can be returned to R10 for cyclic conversion and real...

AI Technical Summary

Problems solved by technology

[0006] ①Using the cooling and condensation process of special quenching oil, the high-temperature reaction heat carried by the high-temperature hydrothermal cracking reaction effluent R10P becomes low-temperature heat energy, and the heat transfer area of ​​the subsequent recovery process will inevitably increase, that is, increase the reaction heat heat transfer investment for the recovery process;

[0007] ②The circulation process of special quenching oil increases the scale of the system, increases investment and energy consumption

[0009] On the other hand, in the hydrothermal cracking process R10 using an upflow expanded bed, in order to prevent the light fraction from entering the process to overcrack the prolific gas, the light fraction exhibits a gaseous state at high temperature and disturbs the hydraulic state of the heavy fraction stream , before the medium and low temperature coal tar enters the R10 process, the light fraction needs to be separated. The current method of separating the light fraction is the atmospheric and vacuum fractionation method. Their common feature is that the atmospheric and vacuum fractionation step is required. Or the light fraction BFL and the heavy fraction BLH obtained after vacuum fractionation are respectively pressurized into the joint hydrogenation upgrading process. The hydrocarbon stream to be pressurized, and finally all the hydrocarbon stream to be pressurized enters the high-pressure process. During the fractionation process BF-FRAC, some materials are heated and vaporized first, and then condensed and liquefied.” The disadvantages are:

[0010] ① To change one channel of pressurized logistics into two or more channels of pressurized logistics, more high-pressure pumps and their supporting pipelines, instruments, electrical, civil engineering and other systems need to be used, which requires large investment, high energy consumption, and high management costs;

[0011] ②The light distillate BFL comes from the medium and low temperature coal tar raw material hydrocarbon BF liquid, which is heated and vaporized, then condensed into a liquid and then pressurized by a pump to enter the high-pressure hydrogenation system, so the investment is high, the energy consumption is large, and the operation is complicated;

[0012] ③Atmospheric and vacuum fractionation steps, including complex pressurization, circulation, heating / cooling steps, the pipeline system in contact with medium and low temperature coal tar or its fraction oil is long, the heat dissipation must be large, the system startup and shutdown process is complicated, and the operating cost is high;

[0013] ④ Atmospheric and vacuum fractionation has many steps, a large number of equipment used, a large chance of leakage, a high risk of polluting the environment and "running, risking, dripping, and leaking"

[0024] Method of the present invention has no report

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