Coal tar full-fraction fluidized bed-fixed bed combined treatment process

A treatment process, coal tar technology, applied in the field of coal chemical industry, can solve the problems of increased investment, insufficient and efficient utilization of coal tar, increased management costs, etc.

Active Publication Date: 2020-07-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This inventive method adopts the suspension bed hydrogenation pretreatment reactor, under thermal cracking, produces part of the heavy component that the fixed bed is difficult to handle, still needs to carry out cutting fractionation, tail oil circulation, needs to set up fractionation tower additionally, has caused investment increase and The management cost increases, and secondly, coal tar cannot be fully and efficiently utilized

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  • Coal tar full-fraction fluidized bed-fixed bed combined treatment process
  • Coal tar full-fraction fluidized bed-fixed bed combined treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Using the medium and low temperature coal tar in Table 1 as raw material, adopt the fluidized bed-fixed bed treatment process in the patent of the present invention, first use a centrifuge to carry out centrifugal desolidification treatment on the whole fraction coal tar raw material (the raw material temperature is 95 °C, and the centrifuge speed is 3500r / min, centrifugation time is 15min), the coal tar raw material and additives obtained after desolidification treatment are mixed into the pretreatment tank for advanced pretreatment, and the mixing ratio of coal tar raw material and additives is 45:1 (mass ratio) , the liquid phase mixture after solid-liquid separation is hydrogenated in an ebullating bed reactor in the presence of hydrogen and a hydrogenation catalyst. The reaction conditions of the ebullating bed hydrogenation reactor are: reaction temperature 380 ° C, reaction pressure 16 MPa , volumetric space velocity 0.5h -1 , the volume ratio of hydrogen to oil ...

Embodiment 2

[0044] Using the medium and low temperature coal tar in Table 1 as the raw material, adopt the fluidized bed-fixed bed treatment process in the patent of the present invention, first use a centrifuge to carry out centrifugal desolidification treatment on the whole fraction coal tar raw material (the raw material temperature is 105 °C, and the centrifuge speed is 4000r / min, centrifugation time is 20min), the coal tar raw material and additives obtained after desolidification treatment are mixed into the pretreatment tank for advanced pretreatment, and the mixing ratio of coal tar raw material and additives is 35:1 (mass ratio) , the liquid phase mixture after solid-liquid separation is hydrogenated in an ebullating bed reactor in the presence of hydrogen and a hydrogenation catalyst. The reaction conditions of the ebullating bed hydrogenation reactor are: reaction temperature 390 ° C, reaction pressure 16.5 Mpa, volumetric space velocity 0.55h -1 , the volume ratio of hydrogen ...

Embodiment 3

[0046] Using the medium and low temperature coal tar in Table 1 as the raw material, adopt the fluidized bed-fixed bed treatment process in the patent of the present invention, first use a centrifuge to carry out centrifugal desolidification treatment on the whole fraction coal tar raw material (the raw material temperature is 110°C, and the centrifuge speed is 4200r / min, centrifugation time is 20min), the coal tar raw material and additives obtained after desolidification treatment are mixed into the pretreatment tank for advanced pretreatment, and the mixing ratio of coal tar raw material and additives is 25:1 (mass ratio) , the liquid phase mixture after solid-liquid separation is hydrogenated in an ebullating bed reactor in the presence of hydrogen and a hydrogenation catalyst. The reaction conditions of the ebullating bed hydrogenation reactor are: reaction temperature 395 ° C, reaction pressure 16.5 Mpa, volumetric space velocity 0.4h -1 , the volume ratio of hydrogen to...

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Abstract

The invention discloses a coal tar full-fraction fluidized bed-fixed bed combined treatment process. The combined treatment process comprises the following steps: feeding a full-fraction coal tar rawmaterial and an auxiliary agent into a pretreatment tank for mixing; carrying out liquid-solid separation after mixing treatment; a liquid-phase material obtained after separation enters a fluidized bed hydrogenation reaction unit for a hydrogenation reaction; feeding the obtained reaction outflow into a separation tank to be subjected to gas-liquid separation, thus forming a gas-phase material and a liquid-phase material after separation, and then separating the liquid-phase material into a first liquid-phase material and a second liquid-phase material, returning the first liquid-phase material to the pretreatment tank; feeding the second liquid-phase material to a fixed bed hydrogenation reaction unit for hydrogenation reaction; and fractionating the reaction outflow to prepare naphtha,diesel oil and hydrogenated tail oil. The process provided by the invention can realize efficient utilization and long-period operation of coal tar resources.

Description

technical field [0001] The invention belongs to the field of coal chemical industry, and relates to a coal tar hydrogenation treatment process, in particular to a high-efficiency conversion process for the full fraction of coal tar by using a combination process of an ebullating bed and a fixed bed by using the whole fraction of coal tar as a raw material. Background technique [0002] Coal tar is a liquid product obtained during coal dry distillation and gasification. At room temperature, coal tar is a black viscous liquid with a high density. It is mainly composed of polycyclic aromatic compounds. The composition of coal tar is extremely complicated. It has been separated and There are more than 500 species identified. [0003] In recent years, with the reduction of conventional petroleum resources and the increasing demand for clean fuel oil, coal tar hydrogenation to prepare clean fuel oil has attracted much attention as a petrochemical substitute, and coal tar hydrogena...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/02
CPCC10G67/02C10G2300/4006C10G2300/4012C10G2300/70C10G2300/80
Inventor 孟兆会陈博杨涛刘玲其他发明人请求不公开姓名
Owner CHINA PETROLEUM & CHEM CORP
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