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A method for reducing viscosity of heavy oil

A heavy oil and catalyst technology, applied in chemical instruments and methods, processing hydrocarbon oil, petroleum industry, etc., can solve the problems of short start-up period, difficult operation, manual decoking, etc., so as to reduce the tendency of polymerization to form coke and reduce the harsh operation. degree, and the effect of inhibiting polymerization and coke formation

Inactive Publication Date: 2020-06-09
HIGH TECH RES INST NANJING UNIV LIANYUNGANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For a certain raw material, the conversion depth of visbreaking has a certain limit. Beyond this limit, visbreaking residue will appear sediment due to phase separation, which cannot meet the stability requirements of visbreaking residue. If the conversion is further deepened, it will be difficult Can cause coking and prevent unit from functioning properly
The early reaction tower was designed as a downflow type, and the start-up period was short, and the coking in the reaction tower was serious. However, the decoking of the reaction tower required manual decoking, which was labor-intensive and time-consuming.
[0005] In short, when the existing visbreaking technology deals with heavy or inferior vacuum residue or heavy oil raw materials, the process flow is complicated, the operation is difficult, and there is a lot of coke during deep visbreaking, so it is necessary to develop new visbreaking technology

Method used

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  • A method for reducing viscosity of heavy oil

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Preparation of basic catalyst support

[0018] Get 300 grams of magnesium nitrate, polyethylene glycol (the purpose of adding polyethylene glycol is to promote the uniform distribution of catalyst active components, increase the surface area of ​​catalyst, and improve the number of active centers. In the roasting process, it can be decomposed and converted into water and CO 2 and remove) 50 grams, completely dissolved in ion-free water, fully stirred and mixed, and dried at 110°C (the main purpose of drying is to remove the water in the solution, and the active components in the solution are adsorbed on the inner and outer surfaces of the carrier, and are in a solid state , the physical properties have not changed. After roasting, chemical changes will occur, and the salts will decompose into oxides) for 8 hours. After 24 hours, the temperature was uniformly lowered to room temperature to obtain a basic catalyst carrier. The particles of the catalyst carrier are crushe...

Embodiment 2

[0020] Preparation of basic catalyst

[0021] 1. Weigh 150.0 grams of the catalyst precursor ZT, dissolve it in ion-free water with nickel nitrate, ammonium molybdate, and boric acid, and prepare a mixed aqueous solution. Preheat the aqueous solution to 60°C, and add the prepared catalyst carrier , impregnated, stirred continuously for 1.5 hours, and stood still for 12 hours. After the impregnation, the temperature was raised to 120°C for drying, and the drying was completed at a constant temperature of 120°C for 12 hours; The catalyst CAT-C with basic carrier was obtained. MoO in the catalyst 3 The content of NiO is 10.6wt%, the content of NiO is 3.6wt%, and the content of B is 2.5wt%.

Embodiment 3

[0023] Application evaluation of heavy oil+catalyst in hydrogenation

[0024] The catalyst evaluation device is a 1000ml stainless steel kettle-type magnetic sealed stirring device. Take 25 grams of catalyst CAT-C, 500 grams of heavy oil, 380°C-600°C fraction, freezing point 86°C, total sulfur content 2.65wt%, 100°C viscosity 920mm 2 / s, add the catalyst and heavy oil into the reactor, after the seal pressure test is qualified, replace the reaction system with nitrogen for 3 times, start to heat up, the temperature rise rate is 10°C / min, and the temperature rises to 150°C, turn on the stirring device, the speed is 400rpm, Supplement hydrogen to the reaction system to 3.0MPa, continue to uniformly raise the temperature to 450°C, control the reaction pressure to 6.0MPa, stabilize for 3 hours, cool to 60°C, reduce the pressure to normal pressure, take out the reaction product, and carry out fractional distillation, of which the gas product is 2.1wt %, gasoline fraction 12.3wt%, d...

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Abstract

The invention discloses a method for reducing viscosity of heavy oil and belongs to the technical field of petroleum processing. The heavy oil component is brought into contact with the catalyst of an alkaline carrier that does not contain silicon and aluminum elements in a viscosity reducing reactor, and cracking, isomerization, condensation reduction, and viscosity reduction are carried out under conditions of an oxygen-free and / or reducing atmosphere. The conditions are reaction temperature 300-550℃; reaction pressure 0.01-6.0Mpa; reaction time 0.1-5.0 hours, which can significantly reduce the viscosity of heavy oil and provide raw materials for heavy oil fuel or heavy oil viscosity reduction for further processing to produce oil and gas products. The present invention uses an acidic catalyst to promote polymerization coke generation, while an alkaline catalyst has the function of inhibiting polymerization coke generation. It uses a heavy oil visbreaking cracking catalyst with an alkaline carrier that does not contain silicon and aluminum, and uses it in an oxygen-free and / or reducing environment. Viscosity reduction under the condition of air separation can, firstly, reduce the tendency of the reaction product to polymerize and coke under the condition of deep viscosity reduction, and secondly, it can reduce the operating severity when achieving a relatively deep viscosity reduction effect.

Description

technical field [0001] The invention relates to a method for reducing viscosity of heavy oil, which belongs to the technical field of petroleum processing. Background technique [0002] Heavy oil visbreaking is one of the important technologies for the development and utilization of heavy oil. The early visbreaking technology is a non-catalytic mild thermal conversion process of heavy oil, the main purpose of which is to reduce the viscosity and pour point of heavy oil, so that it can be mixed with less or no light oil to obtain qualified fuel oil, or heavy oil Provide raw materials for further lightening. Visbreaking is still one of the important means of heavy oil processing due to its simple process, low investment and good benefits. The raw material for visbreaking is mainly vacuum residual oil, and topped crude oil, atmospheric residual oil and heavy crude oil can also be used as raw materials. The visbreaking products are mainly visbreaking gas, naphtha and residual...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G11/02C10G45/04B01J23/883B01J37/08B01J37/02B01J35/10
CPCC10G11/02C10G45/04B01J23/8872B01J37/0201B01J37/082C10G2300/302B01J35/615
Inventor 宋立纲江笑朱亚尉宋金文
Owner HIGH TECH RES INST NANJING UNIV LIANYUNGANG
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