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Preheating feeds to hydrocarbon pyrolysis products hydroprocessing

A technology for hydrotreating and product, which can be applied in hydrotreating process, treatment with hydrogen compounds, treatment of hydrocarbon oil, etc., and can solve the problems of space velocity promoting hydrogenation reaction, catalyst coking, economic deterioration, etc.

Inactive Publication Date: 2014-04-30
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process can be operated at temperatures from 250°C to 380°C and pressures from 5400kPa to 20,500kPa, using catalysts containing one or more of Co, Ni, or Mo; however, significant catalyst coking was observed
Although catalyst coking can be reduced by increasing hydrogen partial pressure, reducing space velocity, and operating at temperatures between 200°C and 350°C; however, SCT hydroprocessing is undesirable under these conditions because increasing hydrogen partial pressure Process economics are worsened by increased hydrogen and equipment costs, and undesired hydrogenation reactions are promoted by increased hydrogen partial pressure, decreased space velocity, and decreased temperature

Method used

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  • Preheating feeds to hydrocarbon pyrolysis products hydroprocessing
  • Preheating feeds to hydrocarbon pyrolysis products hydroprocessing
  • Preheating feeds to hydrocarbon pyrolysis products hydroprocessing

Examples

Experimental program
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Embodiment

[0109] Below is in Figure 2-4 Examples of implementation schemes are depicted in the Process simulation software, obtained from Invensys Inc. Process simulation software is a steady-state simulator that can improve process design and calculation analysis. It is designed to implement rigorous mass and energy balance calculations used in many chemical processes. Used for The simulated reactor feed and product characterization are based on boiling point curve (simulated distillation GC, ASTM D2887) and density from experimental data.

[0110] For all examples, refer to figure 1 , 2 , 3, 4, the separation section 130 represents conventional separation equipment for hydroprocessing, including high-temperature and low-temperature separators, stabilization towers, deacidified gas, and auxiliary equipment such as heat exchangers and recycle gas compressors. Optionally, separation of light fuel and heavy fuel oil is provided to prepare two hydrotreated products. The light fuel oil is...

Embodiment 2

[0115] figure 2 An embodiment is depicted in which a lower temperature first reactor section is used to minimize the risk of coking and fouling in the reactor preheating sequence. This embodiment uses the first lower temperature section 110 in the hydrotreating reactor to apply higher activity catalysts such as Nebula20Criterion DN3651, DN3551 or Albermarle KF860 so that the first reactor section feed 54 is only heated to 600°F (375°C) . The first stage reactor effluent 55 reached 611°F (322°C). Here, however, the most active precursors for coking (asphaltenes, cyclodienes, vinyl aromatics, olefins, dienes, oxygenates) have been hydrotreated. Then the first stage reactor effluent 55 is heated to 742°F (394°C) in the feed preheating heat exchanger 70 and heated to the second stage reactor inlet temperature of 750°F (400°C) by the preheater 90 ). The second stage reactor 111 contains two RT-621 catalyst beds 116,117.

Embodiment 3

[0117] image 3 An embodiment is depicted in which the SCT feed surrounds the reactor feed / effluent heat exchanger 70 and reactor feed adjustment heater 90. In this example, the SCT feed stream 50 is at 534°F (279°C). Hydrogen 60 and utility fluid 20 are mixed and directed to the feed side of reactor feed / effluent heat exchanger 70 and heated to 780°F (415°C) versus 804°F (429°C) reactor effluent 120. The heating stream 80 is then directed to the reactor feed adjustment heater 90 and heated to 940°F (504°C). This 940°F (504°C) hot mixture 91 is then mixed with 534°F (279°C) SCT50 and the entire mixture 100, now at the required reactor inlet temperature of 750°F (400°C), enters the reactor 110.

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Abstract

The invention relates to processes for upgrading products obtained from hydrocarbon pyrolysis, equipment useful for such processes, and the use of upgraded pyrolysis products. A tar-containing stream recovered from the pyrolysis effluent is mixed with a utility fluid, preheated and subsequently hydroprocessed.

Description

[0001] Cross references to related applications [0002] This application requires the application number 61 / 529,565 filed on August 31, 2011, the application number 61 / 529,588 filed on August 31, 2011, and the application number 61 / 657,299 filed on June 8, 2012 The priority rights of the US provisional application are all incorporated herein by reference. Technical field [0003] The present invention relates to upgrading pyrolysis products, methods for obtaining upgraded products from pyrolysis of hydrocarbons, and equipment used in the above methods. Background technique [0004] Pyrolysis processes such as steam cracking can be used to convert saturated hydrocarbons into high-value products such as light olefins, for example, ethylene and propylene. In addition to these useful products, hydrocarbon pyrolysis can also produce large amounts of relatively low-value products such as steam cracking tar ("SCT"). [0005] SCT upgrading methods including conventional catalytic hydroproc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G69/06C10G49/18
CPCC10G69/06C10G49/18C10G2300/708
Inventor J·H·毕驰徐腾K·G·里德D·T·菲卢赫利
Owner EXXONMOBIL CHEM PAT INC
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