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A start-up method of ebullating bed-fixed bed combined process

A combined process and fixed bed technology, which is applied in the fields of hydrotreating process, petroleum industry, hydrocarbon oil treatment, etc., can solve the problems of increased pressure drop and difficult discharge, etc., so as to reduce the pressure drop of the device, reduce the start-up time, and stabilize the The effect of long-term operation

Active Publication Date: 2020-03-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are problems such as the catalyst powder being brought into the subsequent part in the fluidized bed part during the start-up process, resulting in an increase in pressure drop and difficult discharge.

Method used

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  • A start-up method of ebullating bed-fixed bed combined process
  • A start-up method of ebullating bed-fixed bed combined process
  • A start-up method of ebullating bed-fixed bed combined process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The specific operation process is as follows: the catalyst 3 is loaded into the ebullated bed reactor 4 and the fixed bed reactor 5 from the top, and the pressurization line 10 between the ebullated bed 4 and the fixed bed 5 is boosted at a speed of 1.5-2.5 MPa / h, after rising to the pressure required for the reaction, the starting diesel oil enters the part of the pipeline between the ebullating bed 4 and the fixed bed 5 from the raw material pump, heat exchanger 8, heating furnace 9, etc., and enters the ebullating bed reactor respectively 4 and fixed bed 5 to achieve oil feed and catalyst wetting. After the nuclear density meter shows that the ebullated bed reactor reactor 4 realizes catalyst wetting, switch to the conventional raw material pump, heat exchanger 8, heating furnace 9, and ebullated bed Reactor 4, fixed bed reactor 5, separator 6 and the fractionation part, according to the heating rate of 10-20 ℃ / h, further complete the process of vulcanization, raw m...

Embodiment 2

[0038] Same as Example 1, except that the ebullated bed catalyst used is prepared as follows: Weigh 200g of pseudoboehmite dry rubber powder (produced by Wenzhou Jingjing Alumina Co., Ltd.) and place it in a round bottom flask, add 600 g of gram of deionized water for beating, add an appropriate amount of nitric acid molar concentration to the above slurry with a molar concentration of 3mol / L, and a mixed acid solution with a molar concentration of acetic acid of 1mol / L, control the pH value of the slurry to 3 and heat to reflux at 40°C for 3 hours. The above slurry was transferred into an autoclave, 20 g of urea was added to the mixed material, and the autoclave was sealed and heat treated at 140° C. for 6 hours. After cooling to room temperature, the mixed slurry was filtered, washed, and dried at 120° C. for 8 hours to obtain pseudo-boehmite.

[0039] Weigh 200 g of the above-mentioned pseudo-boehmite and place it in a beaker, add 400 mL of xylitol aqueous solution with a m...

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Abstract

The invention discloses a start-up method of a fluidized bed-fixed bed combined process. The method comprises steps as follows: a catalyst is charged into a fluidized bed reactor and fixed bed reactors from the tops; a connecting pipeline between the fluidized bed reactor and the fixed bed reactors is pressurized for boosting; pressure penetrates through the fluidized bed reactor forwards and penetrates through the fixed bed reactors backwards respectively; after pressure is increased to meet the reaction demand, start-up oil enters the fluidized bed reactor and the fixed bed reactors from thepipeline between the fluidized bed reactor and the fixed bed reactors respectively for catalyst wetting; after catalyst wetting, start-up of the reactors is finished, and a device operates normally.According to the start-up method of the fluidized bed-fixed bed combined process, pressure drop of the device can be effectively reduced, the range of processed raw oil is expanded, and stable and long-periodic operation of the device is realized.

Description

technical field [0001] The invention relates to a method for starting a fluidized bed-fixed bed combined process. Background technique [0002] With the rapid development of the world economy, the increasingly strong demand for transportation fuels and chemical raw materials, and the increasingly stringent requirements for the quality of oil products in environmental protection regulations, the deep processing technology of residual oil has become the focus of the development of the oil refining industry. Among them, the hydrogenation technology route will be more and more widely used because of its advantages of high yield of high-quality liquid products and high return on investment. [0003] Among the hydrogenation technologies of heavy oil and residual oil, the fixed bed process is the most mature, reliable and widely used, and will still be the mainstream process technology in the next 10-20 years. Although the fixed bed hydrogenation unit can process most of the resid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G65/04
CPCC10G65/04C10G2300/1037C10G2300/107C10G2300/1077C10G2300/202C10G2300/205C10G2300/70
Inventor 刘建锟方向晨贾丽杨涛郭蓉蒋立敬曾榕辉贾永忠葛海龙孟兆会
Owner CHINA PETROLEUM & CHEM CORP
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