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A process and design method for removing coke and deposits in hydrogenation process

A technology for coking and deposits, applied in the preparation of liquid hydrocarbon mixtures, petroleum industry, corrosion/fouling inhibition of treatment equipment, etc., can solve problems such as coking and deposition in hydrogenation processes

Active Publication Date: 2020-07-07
CATECH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of coking and deposition phenomena in the hydrogenation process, the present invention provides a process and design method for removing coking and deposits in the hydrogenation process

Method used

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  • A process and design method for removing coke and deposits in hydrogenation process
  • A process and design method for removing coke and deposits in hydrogenation process
  • A process and design method for removing coke and deposits in hydrogenation process

Examples

Experimental program
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Effect test

Embodiment 1

[0028] This example is an example of dredging the sediment and a small amount of coke at the bottom of the reactor in the oil-coal slurry bed hydrogenation process.

[0029] like figure 1 As shown, at the bottom of the reactor 3, there is a viscosity detector and a pressure difference detector (not shown), the measured viscosity is 980cSt, and the pressure difference is 120KPa, then start dredging, the dredging direction is along the tangential direction of the inner wall, and the dredging pipeline is a reaction Dredge pipes 1 and 2 at the bottom of the device, the remover is 400-500°C distillate oil and 0.1wt% naphthenate and 0.1wt% amino trimethylene phosphonic acid, the initial dredging speed is 15m / s, and the dredging temperature is 450 ℃, when the viscosity of the medium drops to 500cSt, the dredging speed drops to 9m / s. The 400-500°C distillate in the removal agent mentioned above has a moderate molecular weight, and will not be cracked into gas in a short period of tim...

Embodiment 2

[0031] This example is to dredge the top of the reactor in the oil-coal slurry bed hydrogenation process, and remove the coking accumulation caused by the poor flow of the medium at the outlet of the reactor top.

[0032] like figure 2 As shown, there is a viscosity detector and a pressure difference detector (not shown) at the top of the reactor 6, the viscosity measured by the viscosity detector is 780cSt, the pressure difference is 105KPa, the dredging direction is horizontal, and the dredging pipeline is the top of the reactor. Unclog pipes 4 and 5, remover is 370-430°C distillate oil and 0.7wt% benzenesulfonate, 0.3wt% diethylenetriaminepentamethylenephosphonic acid, 0.1wt% pH=7.5-9 For C9 fatty acid salt, the initial dredging speed is 13m / s, the dredging temperature is 450°C, and after the medium viscosity drops to 350cSt, the dredging speed drops to 9m / s. Distillate oil at 370-430°C has a moderate density and will not affect the quality of light products at the outlet...

Embodiment 3

[0034]In this embodiment, dredging is set across the line of the regulating valve at the outlet of the low-pressure separator. Under normal circumstances, the medium flow rate is small or no, and it is easy to form a blockage at the regulating valve, which affects the need for large flow medium to pass through.

[0035] like image 3 As shown, a viscosity and a differential pressure detector (not shown) are arranged on the pipeline 8 where the valve is located. The viscosity measured by the viscosity detector is 800cSt, the differential pressure is 100KPa, and the remover is 300-350°C distillate oil and 0.5wt% naphthenate and 0.5wt% ethylenediaminetetraacetic acid and hydroxyethylene diphosphonic acid, the dredging direction is the opposite direction of normal flow, which is the valve dredging pipe 7, and the initial dredging speed is 13m / s, The dredging temperature is 280°C, and when the pressure difference drops to 45KPa, the dredging speed drops below 8m / s. The properties ...

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Abstract

The invention provides a process for eliminating hydrogenation process coking materials and deposits and a design method thereof. A removal agent is used for dredging on easy coking and depositing positions, and is prepared from additives and 250 to 520 DEG C distillate oil generated in the hydrogenation process; the additives are prepared from one or several kinds of materials from benzene sulfonate or naphthenate accounting for 0.1 to 0.7 weight percent of the total mass of the removal agents, one or several kinds of materials in amino amino trimethylene phosphonic acid, diethylenetriamine pentamethylphosphonic acid, edetic acid and HEDP accounting for 0.1 to 0.5 weight percent. A viscosity and pressure difference detection instrument is arranged in the easy coking and depositing positions for monitoring the viscosity and pressure difference change in real time; when the viscosity is higher than 750cSt or the pressure difference is higher than or equal to 100KPa, the dredge speed is10 to 15m / s, and the dredge temperature is higher than or equal to 200 DEG C; when the viscosity is higher than 250cSt but lower than or equal to 750cSt, or the pressure different is higher than 40KPabut lower than 100KPa, the dredge speed is 5 to 10m / s.

Description

technical field [0001] The invention relates to a process and a design method, in particular to a process and a design method for removing coke and deposits in a hydrogenation process, and belongs to the fields of oil-coal mixing and coal chemical industry. Background technique [0002] In recent years, the world's oil resources have become increasingly scarce, and the problem of heavy and inferior oil resources has become more and more obvious. However, with the rapid economic growth, the society's demand for oil products is increasing day by day. At the same time, my country is a country rich in coal resources. How to convert the abundant and cheap coal resources into liquid products has become an important development direction for the clean utilization of coal resources. In view of the status quo of petroleum and coal resources, the processes used in hydrogenation include heavy oil deep processing technology and oil-coal mixing technology. [0003] The raw materials in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G1/06C10G75/04
CPCC10G1/065C10G75/04C10G2300/1014
Inventor 李苏安邓清宇王坤朋
Owner CATECH TECH
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